Tokushima University / Educator and Researcher Directory --- Hojo, Masahide

Personal Web Page

https://researchmap.jp/read0191787 (researchmap)

Field of Study

○	Electric Power Engineering, Power System Engineering, Power Electronics

Subject of Study

○	Advanced Control and Analysis of Power Systems (photovoltaic generation system, wind power generation system, wide area measurement system for power system, power quality, power system protection)

Book / Paper

Academic Paper (Judged Full Paper):

1.	Aboelsoud Hossam, Ikeda Naoya, Tsuji Takao, Masahide Hojo and Okada Naotaka : Online Voltage Control of DC Microgrids with Different Loading Conditions Using Particle Swarm Optimization, IEEJ Transactions on Electrical and Electronic Engineering, Vol.17, No.6, 780-791, 2022. (Link to Publication Site) ● Publication site (DOI): 10.1002/tee.23567 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1002/tee.23567 (DOI: 10.1002/tee.23567)
2.	Kentaro Shimomachi, Yuji Mishima and Masahide Hojo : Proposal of PVs Output Autarky System Using Tramway Power Line System, The Transactions of the Institute of Electrical Installation Engineers of Japan, Vol.41, No.1, 1-10, 2021. (Keyword) photovoltaic generation system (Link to Publication Site) ● Publication site (DOI): 10.14936/tieiej.41.1_1 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.14936/tieiej.41.1_1 (DOI: 10.14936/tieiej.41.1_1)
3.	Kenji Yamanaka, Kazuki Okada and Masahide Hojo : Low Fuel Consumption Effect of Medium-Sized Vehicle with Charge Control Using Winding Switching Synchronous Generator, Journal of the Japan Institute of Power Electronics, Vol.JIPE-45, No.07, 98-105, 2020. (Link to Publication Site) ● Publication site (DOI): 10.5416/jipe.45.98 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390003825186814720 ● Search Scopus @ Elsevier (DOI): 10.5416/jipe.45.98 (DOI: 10.5416/jipe.45.98, CiNii: 1390003825186814720)
4.	Bach Quoc Khanh and Masahide Hojo : Optimally selecting the location of a multiple of D statcoms for the improvement of SARFI_X due to faults in the IEEE 33 bus distribution system, IEEJ Transactions on Electrical and Electronic Engineering, Vol.14, No.8, 1172-1180, 2019. (Tokushima University Institutional Repository) ● Metadata: 115127 (Link to Publication Site) ● Publication site (DOI): 10.1002/tee.22915 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1002/tee.22915 (Tokushima University Institutional Repository: 115127, DOI: 10.1002/tee.22915)
5.	Yang Songhao, Masahide Hojo and Zhang Baohui : A Phase-Plane-Based Dynamic Coherency Real-Time Identification Scheme for Controlled Islanding, IEEJ Transactions on Electrical and Electronic Engineering, Vol.14, No.4, 561-568, 2019. (Keyword) controlled slanging / generator coherency / phase plane / phase-plane trajectory vector / dynamic coherency identification (Tokushima University Institutional Repository) ● Metadata: 115125 (Link to Publication Site) ● Publication site (DOI): 10.1002/tee.22839 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1002/tee.22839 (Tokushima University Institutional Repository: 115125, DOI: 10.1002/tee.22839)
6.	Yang Songhao, Hao Zhiguo, Zhang Baohui and Masahide Hojo : An Accurate and Fast Start-Up Scheme for Power System Real-Time Emergency Control, IEEE Transactions on Power Systems, Vol.34, No.5, 3562-3572, 2019. (Link to Publication Site) ● Publication site (DOI): 10.1109/TPWRS.2019.2903159 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1109/TPWRS.2019.2903159 (DOI: 10.1109/TPWRS.2019.2903159)
7.	Yang Songhao, Masahide Hojo and Zhang Baohui : A phase plane trajectory vector based method for real time identification of critical machines, IEEJ Transactions on Electrical and Electronic Engineering, Vol.13, No.11, 1578-1585, 2018. (Summary) The identification of critical machines (CMs) is the first and most important step of Equivalent Single Machine Infinite Bus based methods such as Extend Equal Area Criterion and SIngle Machine Equivalent (SIME) for transient stability assessment and control. This paper presents a novel real time CM identification method based on the Phase Plane Trajectory Vector (PTV) with Phase Measurement Unit (PMU) information support. The proposed method overcomes the drawbacks of conventional CM identification methods and enables the tracking of the change of CMs during the dynamic process. Only two sample points of all generators from PMUs are required to obtain the PTVs at each moment, and the computation of the feature matrix, as well as the k means clustering, is fast and accurate. The application of the PTV based method is verified through cases studied in the IEEE 39 bus New England power system. Results are compared with those obtained by conventional methods. (Keyword) critical machine identification / phase-plane trajectory vector / real time / transient stability / phasor measurement unit (Tokushima University Institutional Repository) ● Metadata: 115124 (Link to Publication Site) ● Publication site (DOI): 10.1002/tee.22722 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1002/tee.22722 (Tokushima University Institutional Repository: 115124, DOI: 10.1002/tee.22722)
8.	Yang Songhao, Zhang Baohui, Masahide Hojo and Fu Su : An ME-SMIB Based Method for Online Transient Stability Assessment of a Multi-Area Interconnected Power System, IEEE Access, Vol.6, 65874-65884, 2018. (Link to Publication Site) ● Publication site (DOI): 10.1109/ACCESS.2018.2876193 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1109/ACCESS.2018.2876193 (DOI: 10.1109/ACCESS.2018.2876193)
9.	Kouichiro Kouno, Eiji Nakanishi, Yoshiaki Nagano and Masahide Hojo : Reactive Power Control of Mega-solar System for Voltage Regulation with Long Distribution Line, IEEJ Transactions on Power and Energy, Vol.135, No.5, 276-289, 2015. (Link to Publication Site) ● Publication site (DOI): 10.1541/ieejpes.135.276 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1541/ieejpes.135.276 (DOI: 10.1541/ieejpes.135.276)
10.	Masahide Hojo and Ippei Usuzumi : Integrated Power Conversion for Multiple DC Voltage Sources and Its Power Quality, Journal of Energy and Power Engineering, Vol.8, No.10, 1783-1790, 2014. (Summary) In a smart grid, electric loads are supplied by various DC (direct current) power sources, such as solar cells or batteries. On the other hand, traditional AC (alternating current) loads like a directly connected induction motors will also be used. In the circumstances, a smart power conversion unit is one of key components, which can integrate these DC or AC apparatus and trade power among them. Authors have developed an integrated power converter based on a well-known circuit topology of flying capacitor multilevel converter. This paper describes the detail of the circuit topology and its characteristics depending on designed parameters. The achieved power quality is also verified by simulation study. (Link to Publication Site) ● Publication site (DOI): 10.17265/1934-8975/2014.10.016 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.17265/1934-8975/2014.10.016 (DOI: 10.17265/1934-8975/2014.10.016)
11.	Masahide Hojo, Ryo Ikeshita, Yoshinobu Ueda and Toshihisa Funabashi : Phasor Control of Converter Output Voltage for Frequency Regulation, Journal of Power and Energy Engineering, Vol.2, No.7, 19-27, 2014. (Summary) The synchronizing torque of a power system may be weakened by increasing installation of static power converters accompanied by renewable energy resources because they used to trade their favorable active power by synchronizing their output voltage with the one at the point of common coupling. In the circumstances, a concept of Virtual Synchronous Machine (VSM) is proposed, where the self-commutated power converters are emulating synchronous generators. This paper describes a converter control to contribute to enhancing the synchronizing torque. The proposed control is similar to the VSM but it simply realizes active power trades among power generation units including converter-based generators by modulating phase angles of their output voltages. Therefore, it can provide an effective support to regulate the system frequency where the total rated power of the converter-based generators increases as much as the one of conventional rotating generators like a microgrid. This paper especially focuses on its robustness where the number of converter-based generators is increased or they are dispersed in the power network. The effectiveness is verified by simulation study based on instantaneous values. (Link to Publication Site) ● Publication site (DOI): 10.4236/jpee.2014.27003 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.4236/jpee.2014.27003 (DOI: 10.4236/jpee.2014.27003)
12.	Masahide Hojo, Hidekadu Takeda and Yuji Mishima : A Design of DC/DC Converter of Photovoltaic Generation System for Streetcars, Journal of International Council on Electrical Engineering, Vol.3, No.2, 164-168, 2013. (Summary) 比較的低電圧の直流で駆動される都市交通システムに着目し，このトロリ線を用いて都市中心部にて太陽光発電システムの直流出力をその近傍で融通する方式について検討を行っている．太陽電池から昇圧チョッパで電気二重層コンデンサをエネルギーバッファとする中間層に接続し，さらに昇降圧チョッパでトロリ線と接続する二段構成の電力変換器を提案し，太陽光発電の最大電力制御とトロリ線電圧の電圧補償も同時に実現している． (Link to Publication Site) ● Publication site (DOI): 10.5370/JICEE.2013.3.2.164 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.5370/JICEE.2013.3.2.164 (DOI: 10.5370/JICEE.2013.3.2.164)
13.	Masahide Hojo, Ryo Ikeshita, Yoshinobu Ueda and Toshihisa Funabashi : Voltage Phasor Control of Self-Commutated Power Converter for Utility Interactive Usage, Journal of the Japan Institute of Power Electronics, Vol.38, 108-114, 2013. (Summary) 自然エネルギー利用電源の電源比率に占める割合が大きくなってくると，同期化力の低下が懸念される．これに対し，筆者らは，自励式電力変換器と従来の同期発電機が互いの位相差に応じて有効電力を授受し，系統の動態安定度向上に寄与する制御方式を提案する．本稿では，簡単なマイクログリッドモデルを用いたシミュレーションに基づき電圧位相の設定方法と安定度向上効果の違いについての比較検討を行った結果について述べる． (Keyword) 自励式電力変換器 / 同期発電機 / 周波数制御 / 電圧フェーザ / Self-commutated power converter / synchronous generator / frequency control / voltage phasor (Link to Publication Site) ● Publication site (DOI): 10.5416/jipe.38.108 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390001205219032064 ● Search Scopus @ Elsevier (DOI): 10.5416/jipe.38.108 (DOI: 10.5416/jipe.38.108, CiNii: 1390001205219032064)
14.	Takuhei Hashiguchi, Tadahiro Goda, Yasunori Mitani, Masayuki Watanabe, Osamu Saeki, Masahide Hojo and Hiroyuki Ukai : Estimation Method of Center of Inertia Frequency Based on Phasor Measurement Data, Journal of Energy and Power Engineering, Vol.6, No.3, 434-445, 2012. (Summary) 筆者らは，家庭用コンセント電圧の多地点同期位相計測に基づく独自の広域電力系統観測システムとその応用に関する研究を行っている．本論文は，特に計測データから大規模系統の慣性中心を推定する方法について検討を行ったもので，これにより電力系統の動揺モードを抽出し，安定度について正確に把握できるようになったなどの成果について述べている．
15.	Shigekazu Sakai, Yasuhiro Hayashi, Shoji Kawasaki, Junya Matsuki, Jumpei Baba, Akihiko Yokoyama, Masahide Hojo, Shinji Wakao, Kenjiro Mori and Yoshiaki Fuwa : Development of Distribution Network Equipment to Support the Solution of Problem of Connecting Distributed Generators (ANSWER) and Verification Experiment of Active Coordinated Operation of Distributed Generator and Distribution Network, IEEJ Transactions on Power and Energy, Vol.130, No.5, 473-483, 2010. (Summary) Recently, total number of distributed generators (DGs) such as photovoltaic generation system and wind power generation system connected to an actual distribution network increases drastically. The distribution network connected with many distributed generators must be operated keeping reliability of power supply, and power quality. In order to accomplish active distribution network operation to take advantage of many connections of DGs, a new coordinated operation of distribution system with many connections of DGs is necessary. So far, the authors have proposed a coordinated operation of distribution network system connected with many DGs by using sectionalizing switches control method, sending voltage control method, computation method of acceptable maximum output of DG and determination method of optimal smoothing time constant of wind power generation system with storage battery. In this paper, the authors develop an experiment of scaled-down three-phase distribution system with distributed generators in order to check the validity of the proposed approach. (Keyword) coordinated operation / distribution network / distributed generator / sectionalizing switch control / sending voltage control / locational and hourly acceptable maximum output of DG / coordinated operation / distribution network / distributed generator / sectionaling switch control / sending voltage control / locational and hourly acceptable maximum output of DG (Link to Publication Site) ● Publication site (DOI): 10.1541/ieejpes.130.473 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282679578479872 ● Search Scopus @ Elsevier (DOI): 10.1541/ieejpes.130.473 (DOI: 10.1541/ieejpes.130.473, CiNii: 1390282679578479872)
16.	Takuhei Hashiguchi, Masayuki Watanabe, Tadahiro Goda, Yasunori Mitani, Osamu Saeki, Masahide Hojo and Hiroyuki Ukai : Estimation Method of Center of Inertia Frequency based on Multiple Synchronized Phasor Measurement Data, IEEJ Transactions on Power and Energy, Vol.130, No.1, 106-113, 2010. (Summary) Open access and deregulation have been introduced into Japan and some independent power producers (IPP) and power producer and suppliers (PPS) are participating in the power generation business, which is possible to makes power system dynamics more complex. To maintain power system condition under various situations, it is essential that a real time measurement system over wide area is available. Therefore we started a project to construct an original measurement system by the use of phasor measurement units (PMU) in Japan. This paper describes the estimation method of a center of inertia frequency by applying actual measurement data. The application of this method enables us to extract power system oscillations from measurement data appropriately. Moreover, the analysis of power system dynamics for power system oscillations occurring in western Japan 60Hz system is shown. These results will lead to the clarification of power system dynamics and may make it possible to realize the monitoring of power system oscillations associated with power system stability. (Keyword) phasor measurement unit / power system oscillations / signal processing / center of inertia / analysis of power system dynamics / phasor measurement unit / power system oscillations / signal processing / center of inertia / analysis of power system dynamics (Link to Publication Site) ● Publication site (DOI): 10.1541/ieejpes.130.106 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282679578223488 ● Search Scopus @ Elsevier (DOI): 10.1541/ieejpes.130.106 (DOI: 10.1541/ieejpes.130.106, CiNii: 1390282679578223488)
17.	Shoji Kawasaki, Yasuhiro Hayashi, Junya Matsuki, Hirotaka Kikuya and Masahide Hojo : Determination Method for Optimal Installation of Active Filters in Distribution Network with Distributed Generation, IEEJ Transactions on Power and Energy, Vol.129, No.6, 733-744, 2009. (Summary) Recently, the harmonic troubles in a distribution network are worried in the background of the increase of the connection of distributed generation (DG) and the spread of the power electronics equipments. As one of the strategies, control the harmonic voltage by installing an active filter (AF) has been researched. In this paper, the authors propose a computation method to determine the optimal allocations, gains and installation number of AFs so as to minimize the maximum value of voltage total harmonic distortion (THD) for a distribution network with DGs. The developed method is based on particle swarm optimization (PSO) which is one of the nonlinear optimization methods. Especially, in this paper, the case where the harmonic voltage or the harmonic current in a distribution network is assumed by connecting many DGs through the inverters, and the authors propose a determination method of the optimal allocation and gain of AF that has the harmonic restrictive effect in the whole distribution network. Moreover, the authors propose also about a determination method of the necessary minimum installation number of AFs, by taking into consideration also about the case where the target value of harmonic suppression cannot be reached, by one set only of AF. In order to verify the validity and effectiveness of the proposed method, the numerical simulations are carried out by using an analytical model of distribution network with DGs. (Keyword) active filters / distributed generation / distribution network / harmonics / voltage total harmonic distortion / active filters / distributed generation / distribution network / harmonics / voltage total harmonic distortion (Link to Publication Site) ● Publication site (DOI): 10.1541/ieejpes.129.733 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282679579301888 ● Summary page in Scopus @ Elsevier: 2-s2.0-67651146427 (DOI: 10.1541/ieejpes.129.733, CiNii: 1390282679579301888, Elsevier: Scopus)
18.	Masahide Hojo and Kazuyuki Minato : A Basic Study on a DC Power Network Using Flying Capacitor Multilevel Inverter, Journal of the Japan Institute of Power Electronics, Vol.34, 76-81, 2009. (Summary) 筆者らは, 分散電源や蓄電装置の直流出力をそのまま負荷で利用することのできる方式として, 需要家における直流給配電システムについて検討を行っている．とりわけ, 複数の直流電圧レベルのキャパシタ端子を有するフライングキャパシタ形マルチレベルインバータを応用して,直流給配電システムに特化した電力変換回路を提案している．本稿では, この変換回路の基本動作について,シミュレーション解析により動作検証を行った結果について述べる． (Keyword) 直流給配電システム / フライングキャパシタ形マルチレベルインバータ / AC/DCコンバータ / DC/DCコンバータ / Dc power supply network / flying capacitor multilevel inverter / ac/dc converter / dc/dc converter (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282680195080960 (CiNii: 1390282680195080960)
19.	Masayuki Watanabe, Takuhei Hashiguchi, Yasunori Mitani, Osamu Saeki, Masahide Hojo and Hiroyuki Ukai : Improvement of the Evaluation of the Wide Area Power System Stability Based on Multiple Synchronized Phasor Measurements with Observation Sites Changed, IEEJ Transactions on Power and Energy, Vol.128, No.1, 84-90, 2008. (Summary) This paper presents a method for monitoring the power system stability based on wide area phasor measurements. The authors have developed a method for detecting inter-area low-frequency modes from measured small oscillations associated with the load fluctuation by approximating filtered oscillations as a simplified oscillation model. The advantage of this method is that steady state phasor fluctuations are available to evaluate the stability of the power system. In this paper, another type of the filter based on the FFT analysis is developed for improving the accuracy of identified eigenvalues with observation sites changed. The method based on the FFT-based filtering is also applied to extract low-frequency oscillations from phasor data of one observation site. Some numerical analyses demonstrate the effectiveness of the method by using phasor dynamical data obtained by a power system simulation package and the phasor measurement system developed in Japan. (Keyword) power system / phasor measurement / GPS / FFT analysis / low-frequency oscillation / eigenvalue / power system / phasor measurement / FFT analysis / low-frequency oscillation / eigenvalue (Link to Publication Site) ● Publication site (DOI): 10.1541/ieejpes.128.84 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282679579451264 ● Search Scopus @ Elsevier (DOI): 10.1541/ieejpes.128.84 (DOI: 10.1541/ieejpes.128.84, CiNii: 1390282679579451264)
20.	Yasuhiro Hayashi, Shoji Kawasaki, Junya Matsuki, Shinji Wakao, Jumpei Baba, Masahide Hojo, Akihiko Yokoyama, Naoki Kobayashi, Takao Hirai and Kohei Oishi : Active Coordinated Operation of Distribution Network System for Many Connections of Distributed Generators, IEEJ Transactions on Power and Energy, Vol.127, No.1, 41-51, 2007. (Summary) Recently, total number of distributed generators (DGS) such as photovoltaic generation system and wind turbine generation system connected to an actual distribution network increases drastically. The distribution network connected with many distributed generators must be operated keeping reliability of power supply, power quality and loss minimization. In order to accomplish active distribution network operation to take advantage of many connections of DGS, a new coordinated operation of distribution system with many connections of DGS is necessary. In this paper, the authors propose a coordinated operation of distribution network system connected with many DGS by using newly proposed sectionalizing switches control, sending voltage control and computation of available DG connection capability. In order to check validity of the proposed coordinated operation of distribution system, numerical simulations using the proposed coordinated distribution system operation are carried out in a practical distribution network model. (Keyword) coordinated operation / distribution network / distributed generator / sectionalizing switch control / sending voltage control / available connection capability / distribution loss / voltage total harmonic distortion / voltage imbalance rate / reliability of power supply / distributed generator / sectionalizing switch control / sending voltage control / available connection capability / distribution loss / voltage total harmonic distortion / voltage imbalance rate / reliability of power supply (Link to Publication Site) ● Publication site (DOI): 10.1541/ieejpes.127.41 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282679580194944 ● Search Scopus @ Elsevier (DOI): 10.1541/ieejpes.127.41 (DOI: 10.1541/ieejpes.127.41, CiNii: 1390282679580194944)
21.	Masahide Hojo, Norihito Kuroe and Tokuo Ohnishi : Fault Current Limiter by Series Connected Voltage Source Inverter, IEEJ Transactions on Industry Applications, Vol.126, No.4, 438-443, 2006. (Summary) In recent years, various types of fault current limiter (FCL) have been developed, because installation of the FCL will bring a lot of benefits to power system operation. Power system controllers based on a concept of Flexible AC Transmission Systems (FACTS) can also be applicable as the FCL with growing power ratings of them. Such FCLs are expected to contribute power system stabilization or power quality enhancement in addition to fault current limitation. Authors have developed a new type of FCL, which consists of a series reactor and a self-commutated voltage source inverter connected in series with a power distribution line by a coupling transformer. In case of a system fault, the FCL will insert a sufficiently large inductance in series with the distribution line by both the series reactor and the inverter, then it will reduce the fault current. On the other hand, the inverter compensates a voltage drop across the series reactor in a standby mode. As a result, the FCL behaves like a negligible impedance in the standby mode. One of the distinctive features of the FCL is a simple configuration because its control strategy does not require an active power source. In addition, inverter voltage rating of the proposed FCL can be reduced by installing the series reactor as compared with other converter-based FCLs. The aim of this paper is to evaluate the operating characteristics of the FCL with both simulation and experimental studies. (Keyword) fault current limiter / voltage source inverter / series reactor / electric power distribution system (Link to Publication Site) ● Publication site (DOI): 10.1541/ieejias.126.438 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282679635065728 ● Summary page in Scopus @ Elsevier: 2-s2.0-33645580851 (DOI: 10.1541/ieejias.126.438, CiNii: 1390282679635065728, Elsevier: Scopus)
22.	Takuhei Hashiguchi, Masayuki Watanabe, Akihiro Matsushita, Yasunori Mitani, Osamu Saeki, Kiichiro Tsuji, Masahide Hojo and Hiroyuki Ukai : Identification of Characterization Factor for Power System Oscillation Based on Multiple Synchronized Phasor Measurements, IEEJ Transactions on Power and Energy, Vol.125, No.4, 417-424, 2005. (Summary) Electric power systems in Japan are composed of remote and distributed location of generators and loads mainly concentrated in large demand areas. The structures having long distance transmission tend to produce heavy power flow with increasing electric power demand. In addition, some independent power producers (IPP) and power producer and suppliers (PPS) are participating in the power generation business, which makes power system dynamics more complex. However, there was little observation as a whole power system. In this paper the authors present a global monitoring system of power system dynamics by using the synchronized phasor measurement of demand side outlets. Phasor Measurement Units (PMU) are synchronized based on the global positioning system (GPS). The purpose of this paper is to show oscillation characteristics and methods for processing original data obtained from PMU after certain power system disturbances triggered by some accidents. This analysis resulted in the observation of the lowest and the second lowest frequency mode. The derivation of eigenvalue with two degree of freedom model brings a monitoring of two oscillation modes. Signal processing based on Wavelet analysis and simulation studies to illustrate the obtained phenomena are demonstrated in detail. (Keyword) GPS / phasor measurement / wavelet transformation / eigenvalue / two degree of freedom model / phasor measurement / wavelet transformation / eigenvalue / two degree of freedom model (Link to Publication Site) ● Publication site (DOI): 10.1541/ieejpes.125.417 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282679579504512 ● Search Scopus @ Elsevier (DOI): 10.1541/ieejpes.125.417 (DOI: 10.1541/ieejpes.125.417, CiNii: 1390282679579504512)
23.	Tokuo Ohnishi and Masahide Hojo : DC Voltage Sensorless Single-Phase PFC Converter, IEEE Transactions on Power Electronics, Vol.19, No.2, 404-410, 2004. (Summary) 本論文は，力率改善形(PFC)コンバータにおいて直流電圧センサを省略可能な新しい制御方式を提案したものである．提案方式は電源電圧の瞬時値のみの検出で実現できる，従来にない簡単な制御系を特徴としている．論文では，負荷変動や電源電圧変動，電源電圧波形歪みによる制御性能への影響も詳細に検討し，コンバータの制御可能範囲を明らかにしている．さらに試作回路に基づく実験による検証も行っている． (Keyword) ac line voltage / dc voltage regulation / PFC converter / RECTIFIERS (Link to Publication Site) ● Publication site (DOI): 10.1109/TPEL.2003.823191 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1109/TPEL.2003.823191 (DOI: 10.1109/TPEL.2003.823191)
24.	Tokuo Ohnishi and Masahide Hojo : AC Line Voltage Harmonics Compensator with Excessive Current Control, IEEE Transactions on Industrial Electronics, Vol.50, No.6, 1126-1133, 2003. (Summary) 本論文は，電源ラインインダクタンスと並列形アクティブフィルタの組み合わせにより上位系統からの電源電圧歪みと負荷電流歪みのいずれに対しても負荷端子電圧歪みを効果的に改善することのできる高調波補償装置について，シミュレーションと実験の両面から詳細な検討を行ったものである．被補償量が過大となった場合には，補償電流が装置容量を越えないように高調波補償ゲインを容易に可変できる点が特徴の一つである． (Keyword) active filters / harmonic distortion / harmonic reduction / instantaneous voltage control / power system harmonics (Link to Publication Site) ● Publication site (DOI): 10.1109/TIE.2003.819673 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1109/TIE.2003.819673 (DOI: 10.1109/TIE.2003.819673)
25.	Takuhei Hashiguchi, Masamichi Yoshimoto, Yasunori Mitani, Osamu Saeki, Kiichiro Tsuji, Masahide Hojo and Hiroyuki Ukai : Monitoring System for Japan Western 60 Hz Power System Based on Multiple Synchronized Phasor Measurements, IEEJ Transactions on Power and Energy, Vol.123, No.9, 1083-1090, 2003. (Summary) 西日本60Hz系統の広域特性を実測可能な計測システムの構築を目指し，GPS信号を利用した多地点同期位相計測装置の設置点選定の考え方並びに計測データから特徴抽出を行うための信号処理手法について詳述している．本システムにより，一般に言われている60Hz系統特有の長周期動揺の特徴抽出に成功したほか，その動揺特性の日変化などについても実測に基づく検討を行うことができた． (Keyword) power system dynamics / GPS / phasor measurements / FFT / wavelet analysis (Link to Publication Site) ● Publication site (DOI): 10.1541/ieejpes.123.1083 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282679577523328 ● Search Scopus @ Elsevier (DOI): 10.1541/ieejpes.123.1083 (DOI: 10.1541/ieejpes.123.1083, CiNii: 1390282679577523328)
26.	Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : Robust Control for Power System Stabilization based on the Direct Control of Power Flow by Phase Shifter, International Journal of Power and Energy Systems, Vol.21, No.3, 154-158, 2001. (Summary) 送電線上に設置された移相器を用いて電力動揺を直接制御することによる系統安定化制御について論じたものである．本来非線形システムである電力系統において状態線形化を基本とする本制御方式の特徴は，動作点に依らない制御効果が期待できるロバスト性にある．本論文では，系統パラメータが変化した場合などにも提案する安定化制御が有効であることを，シミュレーション解析に基づいて明確に示している． (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-1842790487 (Elsevier: Scopus)
27.	Masahide Hojo, Yasunori Mitani, Toshifumi Ise and Kiichiro Tsuji : Quantitative Evaluation on Generator Power Control Effect of FACTS Controllers for Power System Stabilization, The Transactions of The Institute of Electrical Engineers of Japan, Vol.121-B, No.1, 8-14, 2001. (Summary) パワーエレクトロニクスを応用した高機能電力系統制御機器としてのFACTS機器について，それぞれの操作量と発電機出力を電力相差角曲線上で直接関係づけることのできる制御可能領域を提案したものである．この制御可能領域は，FACTS機器の接続形態や構成に関わらず，共通の評価指標として使用することができるため，所望の制御効果を実現するためのFACTS機器の選定にも有効である．
28.	Masahide Hojo, Duangkamol Kamolyabutra, Yasunori Mitani, Toshifumi Ise and Kiichiro Tsuji : Experimental Study on Power System Stabilization by UPFC with Linearizing Control of Power Swing, The Transactions of The Institute of Electrical Engineers of Japan, Vol.120-B, No.2, 202-209, 2000. (Summary) 電力潮流を高速かつ滑らかに制御可能なUPFCを活用し，電力動揺そのものを制御して線形化を行う方式の系統安定化制御について，模擬実験に基づく評価を行ったものである．まず電力潮流の指令値に対する追従制御の制御効果について評価を行ったのち，過渡安定度及び動態安定度の向上効果について検証し，動作条件が変更された場合のロバスト性についても検証している．また，模擬実験装置と実系統との差についても言及している． (Keyword) UPFC / 線形化 / 系統安定化 / 発電機出力制御 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390282679582021376 (CiNii: 1390282679582021376)
29.	Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : Linearization of Generator Power Swing Property by Controlling Power Output of SMES for Enhancement of Power System Stability, IEEE Transactions on Applied Superconductivity, Vol.9, No.2, 338-341, 1999. (Summary) 有効/無効電力を高速かつ滑らかに制御可能な超電導エネルギー貯蔵装置を用いて，発電機出力を直接制御し，過渡動揺そのものを線形化する方式の系統安定化制御について詳細な検討を行ったものである．超電導エネルギー貯蔵装置を発電機至近端に設置した場合においては，発電機出力を効果的に制御することが可能であり，過渡安定度向上に寄与できることが詳細なモデルを用いたシミュレーション解析によって示された．
30.	Duangkamol Kamolyabutra, Masahide Hojo, Yasunori Mitani, Toshifumi Ise and Kiichiro Tsuji : Experimental Study on Power System Stabilizing Control Scheme for the SMES with Solid-State Phase Shifter (SuperSMES) using Local Signals, The Transactions of The Institute of Electrical Engineers of Japan, Vol.119-B, No.5, 581-588, 1999. (Summary) 本論文は，有効/無効電力を自在に制御可能な超電導エネルギー貯蔵装置と，潮流制御機能を有する移相器により構成したSuperSMESによる系統安定化制御について論じたものである．制御装置の設置点に依らず効果的な系統安定化制御の実現を目指して，設置点情報のみによる系統安定化制御系を提案し，実際に構成したSuperSMESによる実験を通して制御効果の検証を行っている．
31.	Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : Robust Stabilization Control of Power System Based on the Direct Control of Generator Power by Series Variable Impedance Unit, The Transactions of The Institute of Electrical Engineers of Japan, Vol.117-B, No.7, 985-990, 1997. (Summary) 電力系統内の長距離大容量送電部分のように安定度が問題になりやすい発電機の安定化制御を目的としたものである．急速な発展を続けるパワーエレクトロニクスを応用した高機能電力系統制御装置に着目し，これによる可変インピーダンス作用により線路潮流を直接制御して対象発電機の動揺方程式を見かけ上線形化するという新しい概念に基づく系統安定化制御系の導出と制御効果の検証結果について詳述している．

Review, Commentary:

1.	Yasunori Mitani, Duangkamol Kamolyabutra, Komsan Hogesombut, Masahide Hojo and Yoshitaka Miura : 紀伊水道直流連系設備, The Journal of The Institute of Electrical Engineers of Japan, Vol.122, No.2, 76-79, Feb. 2002.

Proceeding of International Conference:

1.	U Kyoka and Masahide Hojo : Voltage Phase Control of Distributed Energy Resources for Islanding Operation of Microgrid, Proceedings of the 49th Annual Conference of the IEEE Industrial Electronics Society, Singapore, Oct. 2023. (Link to Publication Site) ● Publication site (DOI): 10.1109/IECON51785.2023.10312347 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85179519208 (DOI: 10.1109/IECON51785.2023.10312347, Elsevier: Scopus)
2.	Hiroki Taketomi, Masahide Hojo, Masayuki Watanabe and Yasunori Mitani : An Estimation Method of Rate of Change of Frequency by Wide-Area Phasor Measurements Based on Histogram of Its Candidates, Proceedings of CIGRE 2022 Kyoto Symposium, Kyoto, Apr. 2022.
3.	Yuki Yamazaki, Hiroshi Suzuki, Takahiro Kitajima, Akinobu Kuwahara, Takashi Yasuno and Masahide Hojo : Development of Spectacles-type Obstacle Detection System Using a Depth Camera for Visually Impaired Persons, RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing 2022, No.2PM3-2-4, 401-404, Online, Feb. 2022.
4.	KAZARI Tomoki, Hiroshi Suzuki, Takahiro Kitajima, Akinobu Kuwahara, Takashi Yasuno and Masahide Hojo : Human Gait Analysis Using Smartphone for Prevention of Long-Term Care, RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing 2022, No.1AM2-2-1, 61-64, Online, Feb. 2022.
5.	Yang Songhao, Fan X, Hao Zhiguo, Zhang Baohui and Masahide Hojo : A novel method for transient stability margin evaluation of the post-disturbance power system, Proceedings of the 15th International Conference on Developments in Power System Protection (DPSP2020), Liverpool, Mar. 2020. (Link to Publication Site) ● Publication site (DOI): 10.1049/cp.2020.0048 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85107364203 (DOI: 10.1049/cp.2020.0048, Elsevier: Scopus)
6.	Masahide Hojo, Hiroyuki Nakagawa, Hibiki Kawaguchi, Kenji Yamanaka, Toshihisa Funabashi, Masaki Imanaka and Takeyoshi Kato : Effectiveness of Frequency and Voltage Regulation by Photovoltaic Generation Units in Microgrid, Proceedings of International Conference on Materials and Systems for Sustainability 2019, Nagoya, Nov. 2019.
7.	Kenji Yamanaka, Naoki Sakamoto and Masahide Hojo : Experimental Study on Wireless Power Transfer System with Double Primary Coils, Proceedings of International Conference on Materials and Systems for Sustainability 2019, Nagoya, Nov. 2019.
8.	Keisuke Okada, Masahide Hojo and Kenji Yamanaka : Study on Mitigation of Power Oscillation of Wind Turbines by Utilizing Their Inertia, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-19, No.63, Kaohsiung, Sep. 2019.
9.	Sho Ishizaki, Masahide Hojo, Ryota Yamamoto and Tomoya Taima : Study on Voltage Control and Load Leveling by VPP Operation with Stationary Battery and Photovoltaic Generation in Distribution System, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-19, No.60, Kaohsiung, Sep. 2019.
10.	Yang Songhao, Zhang Baohui and Masahide Hojo : A Dynamic Generator Coherency Identification Method Based on Phase Trajectory Vector, Proceedings of 2018 IEEE Innovative Smart Grid Technologies-Asia (ISGT Asia 2018), 628-633, Singapore, May 2019. (Link to Publication Site) ● Publication site (DOI): 10.1109/ISGT-Asia.2018.8467887 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85055542293 (DOI: 10.1109/ISGT-Asia.2018.8467887, Elsevier: Scopus)
11.	Go Nakai, Masahide Hojo and Kenji Yamanaka : Voltage Control by Reactive Power Control of Photovoltaic Generation System and Voltage Regulator in Low Voltage Distribution Network, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-18, No.204, Cheju, Oct. 2018.
12.	Mohd Saufi Ahmad, Kenji Yamanaka, Masahide Hojo and Othman Nor Firdaus Kashfi Raja Raja : Modeling and Analysis of Brushless PM Generator for Micro-Hydro System, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-18, No.192, Cheju, Oct. 2018.
13.	Yasuto Komori, Kenji Yamanaka and Masahide Hojo : Fabrication and Verification of Power Supply for Induction Heating, Proceedings of 2018 International Conference on Electrical Machines and Systems (ICEMS 2018), Cheju, Oct. 2018. (Link to Publication Site) ● Publication site (DOI): 10.23919/ICEMS.2018.8549170 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85060053789 (DOI: 10.23919/ICEMS.2018.8549170, Elsevier: Scopus)
14.	Keisuke Okada, Masahide Hojo and Kenji Yamanaka : Smoothing of wind power output by inertial energy interchange between windmills, Proceedings of Grand Renewable Energy 2018, No.P-En-7-2, Yokohama, Jun. 2018.
15.	Shinichi Hiroshige, Kenji Yamanaka and Masahide Hojo : Control Design of Output-Stage Filterless Sinusoidal-Wave Inverter, Proceedings of the 2018 International Power Electronics Conference IPEC-Niigata 2018 - ECCE Asia -, 3369-3374, Niigata, May 2018. (Link to Publication Site) ● Publication site (DOI): 10.23919/IPEC.2018.8507674 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85057305535 (DOI: 10.23919/IPEC.2018.8507674, Elsevier: Scopus)
16.	Xiao Yan, Masahide Hojo, Baohui Zhang and Kenji Yamanaka : Study on a Protection Scheme for Microgrid Based on Current Characteristics of Distributed Energy Resources, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-18, No.21, 79-82, Naha, Feb. 2018.
17.	Fu-Ciao Syu, Shang-Che Yeh, Yu-Chen Chang, Jing-Yuan Lin, Yao-Ching Hsieh, Huang-Jen Chiu, Masahide Hojo and Kenji Yamanaka : Design and implementation of 1 MHz active-clamped resonant flyback converter, Proceedings of IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society, Beijing, Oct. 2017. (Link to Publication Site) ● Publication site (DOI): 10.1109/IECON.2017.8216764 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1109/IECON.2017.8216764 (DOI: 10.1109/IECON.2017.8216764)
18.	Hibiki Kawaguchi, Masahide Hojo, Kenji Yamanaka, Toshihisa Funabashi and Takeyoshi Kato : Power Quality Improvement of a Microgrid with Induction Motor by an Inverter Power Supply, Proceedings of International Conference on Materials and Systems for Sustainability 2017, Nagoya, Sep. 2017.
19.	Hiroyuki Nakagawa, Masahide Hojo, Kenji Yamanaka, Toshihisa Funabashi and Takeyoshi Kato : A Control Method of Voltage Source Inverter with Photovoltaic Generation System and Energy Storage, Proceedings of International Conference on Materials and Systems for Sustainability 2017, Nagoya, Sep. 2017.
20.	Nguyen Binh Nam, Nguyen Anh Dung, Yu-Chen Liu, Yao-Ching Hsieh, Huang-Jen Chiu, Masahide Hojo and Kenji Yamanaka : Design and implementation of digital controlled boost PFC converter under boundary conduction mode, Proceedings of 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia), No.7992197, 1114-1119, Kaohsiung, Jun. 2017. (Link to Publication Site) ● Publication site (DOI): 10.1109/IFEEC.2017.7992197 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85034089298 (DOI: 10.1109/IFEEC.2017.7992197, Elsevier: Scopus)
21.	Pham Phu Hieu, Nguyen Duy Thuc, Yi-Hua Liu, Yao-Ching Hsieh, Huang-Jen Chiu, Masahide Hojo and Kenji Yamanaka : DSP based digital control techniques for Interleaved Boost PFC converter, Proceedings of 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia), Kaohsiung, Jun. 2017. (Link to Publication Site) ● Publication site (DOI): 10.1109/IFEEC.2017.7992081 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1109/IFEEC.2017.7992081 (DOI: 10.1109/IFEEC.2017.7992081)
22.	Marojahan Tampubolon, Wei-Cheng Lin, Jing-Yuan Lin, Yao-Ching Hsieh, Huang-Jen Chiu, Kenji Yamanaka and Masahide Hojo : A study and implementation of three-level boost converter with MPPT for PV application, Proceedings of 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia), No.7992202, 1143-1148, Kaohsiung, Jun. 2017. (Link to Publication Site) ● Publication site (DOI): 10.1109/IFEEC.2017.7992202 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85034090439 (DOI: 10.1109/IFEEC.2017.7992202, Elsevier: Scopus)
23.	Songhao Yang, Baohui Zhang, Masahide Hojo and Kenji Yamanaka : An Optimization Scheme for PMU Placement based on Generators Grouping, Proceedings of 2016 IEEE PES Asia Pacific Power and Energy Engineering Conference, Xi'an, Oct. 2016.
24.	Kouichiro Kouno, Tsuyoshi Sogabe, Katsushi Itou, Tadao Nagase and Masahide Hojo : Field Test of Reactive Power Control of Mega-Solar System for Voltage Regulation with Long Distribution Line, Proceedings of International Conference on Electrical Engineering 2016, Naha, Jul. 2016.
25.	Zian Wang, Masahide Hojo and Kenji Yamanaka : Examination of PLL Circuit Under Different Three-Phase Voltage Unbalanced Rate, Proceedings of International Conference on Electrical Engineering 2016, Naha, Jul. 2016.
26.	Hao Ma, Masahide Hojo, Kenji Yamanaka and Yongqing Meng : Comparison and Analysis on Control Strategies of Generator-Side Converter for Permanent Magnet Direct-drive Wind Power System, Proceedings of International Conference on Electrical Engineering 2016, Naha, Jul. 2016.
27.	Songhao Yang, Masahide Hojo, Kenji Yamanaka and Baohui Zhang : A Novel Method for Optimization of PMU Placement, Proceedings of International Conference on Electrical Engineering 2016, Naha, Jul. 2016.
28.	Naoya Okada, Masahide Hojo and Kenji Yamanaka : A Novel Concept of DC Voltage Taps for Multi-Ended DC Power Supply System, Proceedings of 37th IEEE PELS International Telecommunications Energy Conference, Vol.37, Osaka, Oct. 2015. (Link to Publication Site) ● Publication site (DOI): 10.1109/INTLEC.2015.7572469 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84990944727 (DOI: 10.1109/INTLEC.2015.7572469, Elsevier: Scopus)
29.	Kouichiro Kouno, Tsuyoshi Sogabe, Katsushi Itou and Masahide Hojo : Study on reactive power control of large-scale photovoltaic system for voltage regulation with long distribution line, Proceedings of 2015 IEEE Eindhoven PowerTech, Eindhoven, Jul. 2015.
30.	Takeshi Kawakami, Kenji Yamanaka and Masahide Hojo : Investigation of a Control Method of Antilock Brake System for Electric Vehicles Using an Electric Motor, Proceedings of RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'15), 238-241, Kuala Lumpur, Feb. 2015.
31.	Daishi Shimakawa, Kenji Yamanaka and Masahide Hojo : Experimental Study of Filter-Less Single-Phase SineWave Inverter, Proceedings of RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'15), 234-237, Kuala Lumpur, Feb. 2015.
32.	Kazutaka Mizota, Kenji Yamanaka and Masahide Hojo : Experimental Study of Cell Voltage Equalizer Using Resonance for Series-Connected Energy Storage Cells, Proceedings of RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP'15), 226-229, Kuala Lumpur, Feb. 2015.
33.	Masahide Hojo, Tomoya Masuda and Kenji Yamanaka : Organized Reactive Power Control of Photovoltaic Generation for Voltage Rise Suppression, Proceedings of the Renewable Energy 2014, Vol.CD-ROM, Tokyo, Jul. 2014. (Summary) 太陽光発電の増加に伴う配電線電圧の上昇への対策が課題となっているが，例えば，その系統連系インバータの無効電力制御によって電圧上昇を抑制することも可能である．ただし，条件によっては通信線の新規設置が必要となり，新旧システムが混在する状況では現実解とならない恐れがある．本論文では，理想システムと現実的な制約を考慮した場合との両面から，太陽光発電の導入可能量について検討を行っている．
34.	Masahide Hojo : Power System Monitoring and Analysis by Synchronized Phasor Measurements at Low Voltage Terminals, Panel Session in the International Conference on Electrical Engineering (ICEE2014), Jeju, Jun. 2014.
35.	Masahide Hojo, Nishioka Tomoya and Kenji Yamanaka : A Concept of High Power DC/DC Converter with Double Low Power Outuputs, Proceedings of the 2014 International Power Electronics Conference (IPEC-Hiroshima) - ECCE ASIA -, Sapporo, May 2014. (Summary) 直流送電線に直列接続して電力潮流を分岐できるHVDCタップと称される回路について，それ単体では直流線路に大きな脈動を生じてしまうのに対し，本論文では，それを複数台直列接続して互いに脈動を相殺する新しい方法を提案した．シミュレーションによって，単体設置，複数台単純設置の場合と，提案した制御信号を用いた場合を比較して，その有効性を立証することができた．
36.	Masahide Hojo and Hidekadu Takeda : Voltage Control of a Distribution Line by Photovoltaic Generation Systems and Battery Units, Proceedings of CIGRE SC C6 Colloquium 2013, Yokohama, Oct. 2013. (Summary) 近年，太陽光発電の導入量増加に伴う配電線電圧の上昇への対策が課題となってきている．一方で，定置型蓄電池も実用化し，これを設置する機運も高まってきている．そこで，本論文では，太陽光発電系統連系インバータの無効電力制御による配電線電圧制御と，蓄電池の活用を併用して効果を高める方法について検討を行っている．とくに，設備容量的に導入可能な蓄電池を併設すれば，太陽光発電の導入可能量を増大できることを示した．
37.	Kouno Kouichiro, Hirose Masatsugu, Hashimoto Wataru, Tadao Nagase, Masahide Hojo and Tokuo Ohnishi : Effectiveness of Constant Power Factor Control of Mega-Solar System for Voltage Regulation with Long Distribution Line, Proceedings of the 10th IEEE International Conference on Power Electronics and Drive Systems, Kitakyushu, Apr. 2013. (Link to Publication Site) ● Publication site (DOI): 10.1109/PEDS.2013.6527037 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84880713134 (DOI: 10.1109/PEDS.2013.6527037, Elsevier: Scopus)
38.	Masahide Hojo and Ippei Usuzumi : Integrated Power Converter for Multiple DC Voltage Sources, Proceedings of the Innovative Smart Grid Technologies(ISGT) Europe 2012, Berlin, Oct. 2012. (Summary) 太陽電池やバッテリといった直流エネルギー源と，直流で利用可能な電気負荷ならびに既存の交流負荷との間を電気的に簡単に結合できる，フライングキャパシタ型電力変換回路という既存の回路を応用した集約型電力変換装置を提案している．本論文は，特に自立運転可能な構成とその諸特性について詳細な検討を行ったものである．
39.	Masahide Hojo, Hidekadu Takeda and Yuji Mishima : An Installation Strategy of Photovoltaic Generation Systems to Tram Network by a DC/DC Converter, Proceedings of the International Conference on Electrical Engineering 2012 (ICEE2012), Vol.CD-ROM, No.IS-04, Kanazawa, Jul. 2012.
40.	Masahide Hojo, Ryo Ikeshita, Takeaki Terauchi, Yoshinobu Ueda and Toshihisa Funabashi : A Converter Controller of Virtual Synchronous Machine for Stable Operation of Microgrid, Conference Proceedings of 21th International Conference and Exibition on Electricity Distribution, No.0535, Frankfurt am Main, Jun. 2011. (Summary) 自然エネルギー利用電源の電源比率に占める割合が大きくなってくると，同期化力の低下が懸念される．これに対し，筆者らは，自励式電力変換器と従来の同期発電機が互いの位相差に応じて有効電力を授受し，系統の動態安定度向上に寄与する制御方式を提案する．本稿では，簡単なマイクログリッドモデルを用いたシミュレーションに基づき電圧位相の設定方法についての基礎検討を行った結果について述べている．
41.	Masahide Hojo, Megumi Emoto, Yasunori Mitani, Hiroyuki Ukai and Osamu Saeki : Online Monitoring of Power System Dynamics by Phasor Measurements at Low Voltage Terminals, Proceedings of the IASTED Technology and Management Conferences 2010 - Power and Energy Systems -, Phuket, Nov. 2010. (Summary) 多地点での家庭用コンセント電圧の同期計測に基づく，簡単かつ汎用性の高い電力系統のオンライン計測システムに関する研究の一部として，本論文では，特に計測地点間の位相差―周波数偏差平面におけるベクトルノルムのリアルタイム監視法について述べている．実データに基づく外乱検出を行い，既知の外乱について正しく検出可能なことを示し，提案法の有効性を検証している．
42.	Masahide Hojo, Takeaki Terauchi, Kota Amo, Yoshinobu Ueda and Toshihisa Funabashi : Cooperative Load Sharing Control of Inverter-Based Generators and a Synchronous Generator in a Microgrid, Proceedings of the International Conference on Electrical Engineering 2010 (ICEE2010), Vol.CD-ROM, No.SGIS-01, Busan, Jul. 2010. (Summary) マイクログリッドにおいては，インバータ連系電源の電源比率に占める割合が大きく，その安定運用においては各インバータの果たす役割分担を明確にする必要がある．本稿では，簡単なマイクログリッドモデルを用いたシミュレーションに基づき，複数台のインバータが協調しつつ，特にマイクログリッドが電力系統との間で滑らかに連系/自立運転の切り替えができるような制御方式について検討を行った結果を述べている．
43.	Masahide Hojo and Kazuyuki Minato : Integrated Power Conversion for DC Power System by Flying Capacitor Multi-Level Converter, Proceedings of the 2010 International Power Electronics Conference (IPEC-Sapporo) - ECCE ASIA -, Sapporo, Jun. 2010. (Summary) 筆者らは, 分散電源や蓄電装置の直流出力をそのまま負荷で利用することのできる方式として，複数の直流電圧レベルのキャパシタ端子を有するフライングキャパシタ形マルチレベルインバータを応用した直流給配電システムについて検討を行っている．本稿では，特に系統連系を行って電力系統との間と常時電力を融通しつつ負荷への電力供給を行うシステムについて，シミュレーション解析により動作検証を行った結果について述べている．
44.	Masahide Hojo, Yasunori Mitani, Osamu Saeki, Hiroyuki Ukai and Katsuhiko Sekiguchi : Wide Area Monitoring Solutions and Experiences Employing Data Obtained at Lower Voltage Levels, Proceedings of the 13th Annual Fault and Disturbance Analysis Conference, Atlanta, May 2010. (Summary) 多地点での家庭用コンセント電圧の同期計測に基づく，簡単かつ汎用性の高い電力系統のオンライン計測システムに関する研究の一部として，本論文では，特に計測地点間の位相差―周波数偏差平面におけるリアルタイム監視結果の例と，近傍での小外乱と，遠方で生じた系統全体に波及する外乱との区別法について，既知の実データに基づく検証を行い，提案法の有効性を示している．
45.	Masahide Hojo, Yuki Fukuoka, Toshihisa Funabashi and Ghanim Putrus : Simplified Power Quality Conditioner for Dynamic Voltage Restoration and Fault Current Limitation, Proceedings of the 10th International Conference on Developments in Power System Protection, No.15.5, Manchester, Apr. 2010. (Summary) 著者らは，大容量電力変換回路の電力系統への応用の一つとして，直列リアクトルと直列接続方式の自励式電力変換器を組み合わせた新しい限流器の検討を行っている．本稿では，この限流器について，ダイオード整流器を用いた簡単な回路構成で自励式電力変換器の背後直流電圧を供給できることを示し，DVR機能を付与するなど，機能性の向上を図った結果について述べている．
46.	Masahide Hojo, Keiichi Abe, Yasunori Mitani, Hiroyuki Ukai and Osamu Saeki : Real-Time Power System Monitoring at Demand Sides by Campus Wide Area Measurement System, Proceedings of the 35th Annual Conference of the IEEE Industrial Electronics Society, No.PD-012521, Porto, Nov. 2009. (Summary) 多地点での家庭用コンセント電圧の同期計測に基づく，簡単かつ汎用性の高い電力系統のオンライン計測システムに関する研究の一部として，本論文では，特に計測地点間の位相差―周波数偏差平面におけるリアルタイム監視法の基礎検討を行い，複数の地域電力系統間の計測結果を比較検討し，電気的結合の強度と関連した計測結果が観測できたことを示し，提案方法の有効性を示している． (Link to Publication Site) ● Publication site (DOI): 10.1109/IECON.2009.5415149 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-77951567769 (DOI: 10.1109/IECON.2009.5415149, Elsevier: Scopus)
47.	Masahide Hojo, Keiichi Abe, Yasunori Mitani, Hiroyuki Ukai and Osamu Saeki : Online Power System Monitoring by Campus Wide Area Measurement System, Proceedings of International Conference on Advanced Power System Automation and Protection 2009, No.P-154, Cheju, Oct. 2009. (Summary) 多地点での家庭用コンセント電圧の同期計測に基づく，簡単かつ汎用性の高い電力系統のオンライン計測システムに関する研究の一部として，本論文では，特に計測地点間の位相差―周波数偏差平面におけるリアルタイム監視法の基礎検討を行い，複数の地域電力系統間の計測結果を比較検討した結果に基づき，その応用方法の提案を行っている．
48.	Masahide Hojo, Hidetoshi Hatano and Yoshiaki Fuwa : Voltage Rise Suppression by Reactive Power Control with Cooperating Photovoltaic Generation Systems, Conference Proceedings of 20th International Conference and Exibition on Electricity Distribution, No.0301, Praha, Jun. 2009. (Summary) 太陽光発電システムが配電系統に多数台導入された場合，その逆潮流によって配電線に電圧上昇を引き起こす可能性がある．これを抑制する方法の一つとして，系統連系インバータの無効電力制御を行う方法が考えられる．本論文では，この無効電力制御を集中管理システムによって統合的に行う場合について，特に通信速度の影響などについて検討を行ったものである．
49.	Masahide Hojo and Toshihisa Funabashi : Unified power quality conditioner for dynamic voltage restoration and fault current limitation, Proceedings of 13th International Conference on Harmonics and Quality of Power, Vol.USB Flash Drive, No.1166, Wollongong, Oct. 2008. (Summary) 者らは，大容量電力変換回路の電力系統への応用の一つとして，直列リアクトルと直列接続方式の自励式電力変換器を組み合わせた新しい限流器の検討を行っている．本稿では，電圧補償機能を付与した多機能型限流器について，その設計方針について検討した結果を述べている．
50.	Masahide Hojo, Yuta Iwase, Toshihisa Funabashi and Yoshinobu Ueda : A method of three-phase balancing in microgrid by photovoltaic generation systems, Proceedings of 2008 13th International Power Electronics and Motion Control Conference, Vol.CD-ROM, No.394, Poznan, Sep. 2008. (Summary) 配電系統に導入された分散電源用インバータは，その余剰容量の下で制御機能を付与し，付加価値を高めることができる．本論文は，不平衡補償に応用する方法を提案し，シミュレーション解析によってその効果の検証を行ったものである．
51.	Shoji Kawasaki, Yasuhiro Hayashi, Junya Matsuki, Hirotaka Kikuya and Masahide Hojo : Optimal Allocation and Gain of Active Filter for Distribution Network Connected Distributed Generation, Proceedings of the International Conference on Electrical Engineering 2008, No.P-152, Okinawa, Jul. 2008.
52.	Takuhei Hashiguchi, Tadahiro Goda, Yasunori Mitani, Masayuki Watanabe, Osamu Saeki, Masahide Hojo and Hiroyuki Ukai : Detection Method of Power System Oscillations in Phasor Measurement Data, Proceedings of International Conference on Electrical Engineering 2008, No.P-102, Okinawa, Jul. 2008.
53.	Masahide Hojo, Kota Amo, Toshihisa Funabashi and Yoshinobu Ueda : A control method of parallel inverter for smart islanding of a local power system, Renewable Energy & Power Quality Electronic Journal, Vol.on the Web site, No.502, Santander, Mar. 2008. (Summary) マイクログリッドを構成する複数のインバータ連系電源について，各インバータの制御モードの設定が，その安定運用にとって重要な課題である．本稿では，簡単なマイクログリッドモデルを用いたシミュレーションに基づき，複数台のインバータが協調しつつ負荷分担を行えるような制御方式について検討を行った結果を述べている．
54.	Masahide Hojo, Yasunori Mitani, Hiroyuki Ukai, Osamu Saeki and Issarachai Ngamroo : A Study on Behaviors of Phase Differences and Frequency Deviations in Thailand Power System by Wide Area Phasor Measurement System, IEEJ-EIT Joint Symposium on Advanced Technology in Power Systems, 43-46, Bangkok, Nov. 2007. (Summary) 筆者らは，家庭用コンセント電圧の多地点同期位相計測に基づく独自の広域電力系統観測システムとその応用に関する研究を行っている．本論文は，日本において検証を行ってきた独自のオンラインモニタリングシステムをタイ王国ほか東南アジア諸国間連系に適用した場合の観測結果について検討を行い，有用性を示したものである．
55.	Masahide Hojo, Yuki Fujimura, Tokuo Ohnishi and Toshihisa Funabashi : Experimental Studies on Fault Current Limiter by Voltage Source Inverter with Line Voltage Harmonics Compensation, Proceedings of European Conference on Power Electronics and Applications, Vol.CD-ROM, No.0324, Aalborg, Sep. 2007. (Summary) 著者らは，大容量電力変換回路の電力系統への応用の一つとして，直列リアクトルと直列接続方式の自励式電力変換器を組み合わせた新しい限流器の検討を行っている．本稿では，この発展型の一つとして，平常時に高調波補償機能を付与した高機能限流器の提案を行っており，実験結果とともに，その有効性を示している．
56.	Masahide Hojo, Akira Izume, Tokuo Ohnishi, Shoji Taki, Kohei Oishi and Nobuyuki Fujiwara : A Control Method of Photovoltaic Generation Systems for Voltage Rise Suppression, Proceedings of the International Conference on Electrical Engineering 2007, No.531, Hong Kong, Jul. 2007. (Summary) 太陽光発電システムが配電系統に多数台導入された場合，その逆潮流によって配電線に電圧上昇を引き起こす可能性がある．これを抑制する方法の一つとして，系統連系インバータの無効電力制御を行う方法が考えられる．本論文では，この無効電力制御をインバータがそれぞれ自律的に行う場合，集中管理システムによって統合的に行う場合などについて制御効果の検証を行ったものである．
57.	Shigekazu Sakai, Yasuhiro Hayashi, Junya Matsuki, Jumpei Baba, Shinji Wakao, Naoki Kobayashi, Shoji Kawasaki, Masahide Hojo, Akihiko Yokoyama and Kohei Oishi : Active Coordinated Operation of Distribution Network with Distributed Generators, Proceedings of the International Conference on Electrical Engineering 2007, No.480, Hong Kong, Jul. 2007.
58.	Hirotaka Kikuya, Shoji Kawasaki, Yasuhiro Hayashi, Junya Matsuki and Masahide Hojo : Study on Optimal Allocation and Gain of Active Filter Considering Distribution Network Configuration, Proceedings of the International Conference on Electrical Engineering 2007, No.479, Hong Kong, Jul. 2007.
59.	Tokuo Ohnishi and Masahide Hojo : Utility Power Quality Control by using A Three Phase Inverter Module, IEEE Power Electronics Specialists Conference - 2007 Record (CD-ROM), No.793, 3073-3078, Orlando, Jun. 2007. (Link to Publication Site) ● Publication site (DOI): 10.1109/PESC.2007.4342516 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-48349094530 (DOI: 10.1109/PESC.2007.4342516, Elsevier: Scopus)
60.	Masahide Hojo, Yuki Fujimura, Tokuo Ohnishi and Toshihisa Funabashi : Design of fault current limiter by series-connected voltage source inverter, Proceedings of International Conference on Advanced Power System Automation and Protection (APAP2007), Vol.CD-ROM, No.P524, Cheju, Apr. 2007. (Summary) 著者らは，大容量電力変換回路の電力系統への応用の一つとして，直列リアクトルと直列接続方式の自励式電力変換器を組み合わせた新しい限流器の検討を行っている．本稿は，この具体的な設計手法について言及したもので，シミュレーションによりその限流特性の検証も行い，所望の特性が得られたことを確かめている．
61.	Kenji Yamanaka, Tokuo Ohnishi and Masahide Hojo : A Novel Position Sensorless Vector Control of Permanent-Magnet Synchronous Motors, Conference Proceedings of the Fourth Power Conversion Conference (PCC-Nagoya 2007), 290-295, Nagoya, Apr. 2007.
62.	Masahide Hojo and Tokuo Ohnishi : Studies on Relations between Frequency and Phase Difference in Power System Based on Phasor Measurements, Proceedings of the Third IASTED Asian Conference on Power and Energy Systems, 478-482, Phuket, Apr. 2007. (Summary) 筆者らは，家庭用コンセント電圧の多地点同期位相計測に基づく独自の広域電力系統観測システムとその応用に関する研究を行っている．本論文では，特に周波数偏差と観測地点間の電気的位相差とを比較し，その効果を確かめている．
63.	Masahide Hojo, Kensuke Kaneda and Tokuo Ohnishi : A Harmonic Mitigation Method by Utilization of Inverters for Distributed Generation System, Proceedings of the Renewable Energy 2006, Vol.CD-ROM, No.P-N-16, Chiba, Oct. 2006. (Summary) 配電系統における高調波問題の解決を目指し，直列型アクティブフィルタと並列型アクティブフィルタを併用する際のそれらの最適設置位置について検討を行ったものである．
64.	Masahide Hojo, Yuki Fujimura, Tokuo Ohnishi and Toshihisa Funabashi : An operating mode of voltage source inverter for fault current limitation, Proceedings of the International Universities Power Engineering Conference, Vol.CD-ROM, No.WPT8a, Newcastle upon Tyne, Sep. 2006. (Summary) 著者らは，大容量電力変換回路の電力系統への応用の一つとして，直列リアクトルと直列接続方式の自励式電力変換器を組み合わせた新しい限流器の検討を行っている．本稿では，特に変換器の動作モードについて検討を行っている．
65.	Masahide Hojo and Tokuo Ohnishi : Operating Characteristics of a Loop Power Flow Controller by a Series-Connected Voltage Source Inverter, Proceedings of the International Conference on Electrical Engineering 2006, Vol.CD-ROM, No.PS1-PR1-14, YongPyong, Korea, Jul. 2006. (Summary) 配電系統の末端をBTB形式の変換器で相互に結び，その電力融通を可能にするLoop Power Flow Controller について，直列変換器を用いた方式を新たに提案し，その動作特性をシミュレーションに基づき検証した結果について述べたものである．
66.	Masahide Hojo and Tokuo Ohnishi : Adjustable Harmonic Mitigation for Grid-Connected Photovoltaic System Utilizing Surplus Capacity of Utility Interactive Inverter, IEEE Power Electronics Specialists Conference - 2006 Record (CD-ROM), 1734-1739, Cheju, Jun. 2006. (Summary) 太陽光発電システムは，その発電特性から，普通は変換器に余剰容量が存在する．本論文では，その余剰容量を活用して高調波抑制機能を付与することを提案し，単一制御ゲインの調整によって補償の深さを調整できるよう構成した．その有効性は，詳細なシミュレーション解析により確かめることができた． (Link to Publication Site) ● Publication site (DOI): 10.1109/PESC.2006.1712025 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-42449100793 (DOI: 10.1109/PESC.2006.1712025, Elsevier: Scopus)
67.	Tokuo Ohnishi, Kenichiro Ueki and Masahide Hojo : Stable Control Method of Source Current Detection Type Active Filter by Voltage Harmonics Feedback, Proceedings of 11th European Conference on Power Electronics and Applications, Dresden, Sep. 2005.
68.	Yutaka Ota, Hiroyuki Ukai, Kouichi Nakamura, Yasunori Mitani, Masahide Hojo and Osamu Saeki : PMU based power oscillation detection system and its application to Japanese longitudinal power system, Proceedings of 15th Power Systems Computation Conference, Vol.PS4, Liege, Belgium, Aug. 2005.
69.	Masahide Hojo, Kazuya Ohnishi, Tokuo Ohnishi, Yasunori Mitani, Osamu Saeki and Hiroyuki Ukai : Analysis of load frequency control dynamics based on multiple synchronized phasor measurements, Proceedings of 15th Power Systems Computation Conference, Vol.PS9, Liege, Belgium, Aug. 2005. (Summary) 筆者らは，家庭用コンセント電圧の多地点同期位相計測に基づく独自の広域電力系統観測システムとその応用に関する研究を行っている．本論文では，外乱直後の計測データから大規模系統の主要な電力動揺モードを抽出し，その時間変化を詳細に追ったもので，実測データに基づいて系統解析が可能なことを示したところに特色がある．
70.	Masahide Hojo, Norihito Kuroe and Tokuo Ohnishi : Fault Current Limiter with Harmonics Compensation Based on Voltage Source Inverter, Proceedings of the International Conference on Electrical Engineering 2005, Vol.CD-ROM, No.SP1-11, Kunming, Jul. 2005. (Summary) 著者らは，大容量電力変換回路の電力系統への応用の一つとして，直列リアクトルと直列接続方式の自励式電力変換器を組み合わせた新しい限流器の検討を行っている．本稿では，この発展型の一つとして，平常時に高調波補償機能を付与した高機能限流器の提案を行っており，シミュレーションによってその基本的な特性を確かめている．
71.	Masahide Hojo, Norihito Kuroe and Tokuo Ohnishi : Fault Current Limiter Based on Series Connected Voltage Source Inverter, Proceedings of the International Power Electronics Conference (IPEC-Niigata 2005), Vol.CD-ROM, No.S6-4, Niigata, Apr. 2005. (Summary) 著者らは，大容量電力変換回路の電力系統への応用の一つとして，直列リアクトルと直列接続方式の自励式電力変換器を組み合わせた新しい限流器の検討を行っている．本稿では，この限流器について，シミュレーション結果に基づき，その動作特性を詳細に検証している．
72.	Takuhei Hashiguchi, Yasunori Mitani, Osamu Saeki, Kiichiro Tsuji, Masahide Hojo and Hiroyuki Ukai : Monitoring Power System Dynamics Based on Phasor Measurements from Demand Side Outlets Developed in Japan Western 60 Hz System, Proceedings of 2004 IEEE PES Power Systems Conference & Exposition (CD-ROM), No.POSTER-B.21, 1183-1189, New York, Oct. 2004. (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-15944402779 (Elsevier: Scopus)
73.	Takuhei Hashiguchi, Masamichi Yoshimoto, Yasunori Mitani, Osamu Saeki, Kiichiro Tsuji, Masahide Hojo, Hiroyuki Ukai, Junichi Toyoda and Akihiro Matsushita : Analysis of Oscillation Characteristics Followed by Power System Disturbance Based on Multiple Synchronized Phasor Measurements, Proceedings of International Conference on Electrical Engineering 2004, Vol.2, No.PO1-64, 644-649, Sapporo, Jul. 2004.
74.	Tokuo Ohnishi, Kenichiro Ueki and Masahide Hojo : Source Current Detection Control of Active Filter for Preventing Current Oscillation, IEEE Power Electronics Specialists Conference - 2004 Record (CD-ROM), Aachen, Germany, Jun. 2004. (Summary) 電源電流検出方式アクティブフィルタは，その制御システムの簡便さという長所が注目されながらも，スイッチングノイズフィルタ等のキャパシタとの反共振現象の抑制が課題であった．本論文では，まず振動現象についてボード線図により明らかにし，その抑制手法として，電源電流の微分量をフィードバック信号に加えるだけで振動抑制が可能な制御系の提案を行っている．さらに，試作システムによる実験的検証も行っている． (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-8744281398 (Elsevier: Scopus)
75.	Takuhei Hashiguchi, Yasunori Mitani, Osamu Saeki, Kiichiro Tsuji, Masamichi Yoshimoto, Hiroyuki Ukai and Masahide Hojo : Analysis of Power System Dynamics Based on Multiple Synchronized Phasor Measurements, Proceedings of IEEE Power Engineering Society 2003 General Meeting, Vol.2, 615-620, Toronto, Canada, Jul. 2003. (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-1542359631 (Elsevier: Scopus)
76.	Takuhei Hashiguchi, Masamichi Yoshimoto, Yasunori Mitani, Osamu Saeki, Kiichiro Tsuji, Hiroyuki Ukai and Masahide Hojo : Observation of Power System Oscillation Characteristics by Using Measurement Data Obtained from Demand Side Outlets, 2003 IEEE Bologna PowerTech Proceedings (CD-ROM), Vol.2, No.289, 605-655, Bologna, Italy, Jun. 2003. (Link to Publication Site) ● Publication site (DOI): 10.1109/PTC.2003.1304624 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-69049121255 (DOI: 10.1109/PTC.2003.1304624, Elsevier: Scopus)
77.	Masahide Hojo, Tokuo Ohnishi, Yasunori Mitani, Osamu Saeki and Hiroyuki Ukai : Observation of Frequency Oscillation in Western Japan 60Hz Power System Based on Multiple Synchronized Phasor Measurements, 2003 IEEE Bologna PowerTech Proceedings (CD-ROM), Vol.2, No.1304625, 656-662, Bologna, Italy, Jun. 2003. (Summary) 西日本60Hz系統の多地点同期位相計測システムの応用研究として，広域的な計測結果に基づく周波数変動特性の解析結果について論じたものである．広域的かつ長期的同期計測の必要があるこうした研究は例が無く，ウェーブレット解析により，ある外乱ののち，周波数変動が系統内を波及する様子を計測データから抽出し，確認することができた． (Link to Publication Site) ● Publication site (DOI): 10.1109/PTC.2003.1304625 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84861515371 (DOI: 10.1109/PTC.2003.1304625, Elsevier: Scopus)
78.	Tokuo Ohnishi and Masahide Hojo : DC Voltage Sensorless Single Phase PFC Converter, IEEE Power Electronics Specialists Conference - 2002 Record, Vol.3, 1137-1142, Cairns, Australia, Jun. 2002. (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0036444521 (Elsevier: Scopus)
79.	Tokuo Ohnishi and Masahide Hojo : Harmonics Compensator by Connecting Sinusoidal Voltage PWM Converters, Proceedings of the Power Conversion Conference-Osaka (PCC-Osaka), Vol.3, No.D15-3, 1399-1404, Osaka, Apr. 2002.
80.	Duangkamol Kamolyabutra, Yasunori Mitani, Kiichiro Tsuji and Masahide Hojo : Fault Current Limiting and Power System Stabilization by Static Synchronous Series Compensator, Proceedings of 2000 International Conference on Power System (PowerCon2000), Vol.3, 1581-1586, Perth, Dec. 2000.
81.	Tokuo Ohnishi, Masahide Hojo and Nobuyuki Matsui : Instantaneous Line Voltage Controlled Harmonics Compensator, Proceedings of 2000 IEEE International Conference on Industrial Electronics, Control and Instrumentation, 754-759, Nagoya, Oct. 2000. (Link to Publication Site) ● Publication site (DOI): 10.1109/IECON.2000.972217 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84969246363 (DOI: 10.1109/IECON.2000.972217, Elsevier: Scopus)
82.	Masahide Hojo and Tokuo Ohnishi : SVG Using Three-Level PWM Inverter Constructed by Series Capacitors, Proceedings of the International Power Electronics Conference (IPEC-Tokyo 2000), Vol.4, 2151-2156, Tokyo, Apr. 2000. (Summary) 本論文では，フライングキャパシタ方式マルチレベルコンバータを用いた自励式静止型無効電力補償装置について検討を行っている．本方式においては，キャパシタ電圧を一定に制御しつつマルチレベル出力が可能な点に特徴があり，これによってキャパシタ容量の低減が期待できる．シミュレーション解析により，こうした特徴を明らかにするとともに，初期充電方式についても検討を加えている．
83.	Duangkamol Kamolyabutra, Masahide Hojo, Yasunori Mitani, Toshifumi Ise and Kiichiro Tsuji : Investigation of the Effect of Control Scheme for the SMES with Solid-State Phase Shifter (SuperSMES) on Power System Stabilization, Proceedings of IEEE Power Tech '99 Conference, 150-156, Budapest, Sep. 1999.
84.	Masahide Hojo, Duangkamol Kamolyabutra, Yasunori Mitani, Toshifumi Ise and Kiichiro Tsuji : Power System Stabilization Based on Power Swing Linearization Controlled by UPFC, Proceedings of IEEE Power Tech '99 Conference, 163-168, Budapest, Sep. 1999. (Summary) 有効/無効電力を高速かつ滑らかに制御可能なUPFCを用いて，発電機出力を直接制御し，過渡動揺そのものを線形化する方式の系統安定化制御について詳細な検討を行ったものである．
85.	Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : Robust Control for Power System Stabilization by Solid-State Phase Shifter, Proceedings of 13th Power Systems Computation Conference, Vol.2, 1229-1234, Trondheim, Jul. 1999. (Summary) 長距離大容量送電を行っている発電機の安定度向上を目的として，まず送電線に設置した高速移相器による発電機出力の制御可能範囲を電力相差角曲線上で明らかにし，これまで検討を行ってきた電力動揺を直接制御して線形化する制御方式の過渡特性を同じく電力相差角曲線上で論じることによって提案制御方式が制御可能範囲を有効に活用した制御方式であることを示すことができた．
86.	Yasuharu Ohsawa, Masahide Hojo, Akira Yoneda and Hiroaki Sugihara : Studies on Stability of Power Systems Consisting of Many Dispersed Power Sources, Proceedings of International Symposium on Bulk Power Systems Dynamics and Control-IV Restructuring, Santorini, Aug. 1998.
87.	Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : Voltage and Power Swing Stabilization by Decoupled Control with AVR and Phase Shifter, Proceedings of 1998 International Conference on Energy Management and Power Delivery, Vol.1, 183-188, Singapore, Mar. 1998. (Summary) 電力動揺を直接制御し線形化する方式の系統安定化制御は，系統状態の変化に対してロバストであるなど優れた特徴を有することがわかってきている．本論文は，通常発電機に設置されている電圧制御系としてのAVRと相互に干渉することなく，電力動揺と電圧変動を同時に効果的に抑制する制御方式について，詳細なシミュレーション解析に基づいて検討を行ったものである．
88.	Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : Robust Control for Power System Stabilization Based on the Direct Control of Power Flow by Phase Shifter, Proceedings of the IASTED International Conference on High Technology in the Power Industry, 157-162, Orlando, Oct. 1997. (Summary) パワーエレクトロニクス機器の大容量化に伴い，電力系統の制御機器への応用も始まっている．著者らは，発電機出力を直接制御して電力動揺を線形化する系統安定化法を提案し，検討している．本論文は，直列インバータの挿入電圧による無効電力制御のみによって可変リアクタンスを実現し，これによって送電線電力潮流，すなわち発電機出力を制御することを提案したもので，シミュレーション解析によってその特性を明らかにしている．
89.	Yuji Izuno, Masahide Hojo and Mutsuo Nakaoka : Software-Based Adjusting P-I Gain Controller for Speed-Tracking Servo System Using Traveling-Wave Type Ultrasonic Motor, Conference Record of the 1994 IEEE Industry Applications Conference, Vol.3, 1777-1784, Denver, Oct. 1994.

Proceeding of Domestic Conference:

1.	OHATA Kaito and Masahide Hojo : Study on Improvement of Converter Controller for Distributed Generator with Output Voltage Phase Control against a Short-Circuit Fault in Microgrid, パワーエレクトロニクス学会後援予稿集, No.256, 40, Dec. 2024.
2.	Yudai Yokoyama and Masahide Hojo : Basic Study on a Configuration of DC Distribution System by Unified Power Flow Controller, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 82, Sep. 2023.
3.	Hirotaka Kawaguchi and Masahide Hojo : A Converter Control for Distributed Power Supplies Emulating Power Swing Equation, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 81, Sep. 2023.
4.	Haruki Amakata, Kohsuke Inui and Masahide Hojo : Study on a Detail Analysis Model of Voltage Controller for Distribution System, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 80, Sep. 2023.
5.	Yusuke Utsumi and Masahide Hojo : Operating Characteristics of Five-Level Flying Capacitor Multi-Level Converter for DC Power Supply System, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 161-162, Sep. 2023.
6.	Kyoka U and Masahide Hojo : Stability of Microgrid with Inverter Power Supply Equipped with Variable Gain Phase Control, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 159-160, Sep. 2023.
7.	Kenta Nishikawa, Masahide Hojo, Ryo Maeda and Ryohei Koizumi : Influences of Nighttime Charging of Electric Vehicles and Voltage Control of Distribution System by Charging Schedule, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 157-158, Sep. 2023.
8.	Masaya Ozaki, Masahide Hojo, Ryo Maeda and Ryohei Koizumi : Study on Voltage Control of Distribution System Utilizing Blockchain, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 155-156, Sep. 2023.
9.	Jin Koshizawa and Masahide Hojo : Basic Study on Power Trade Function among Local Power Systems by Multi-Terminal HVDC System for Offshore Wind Farm, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 91-92, Sep. 2023.
10.	Teppei Taruya and Masahide Hojo : Operating Characteristics of HVDC Transmission System by Line-Commutated Converters with HVDC-Tap Circuits, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 89-90, Sep. 2023.
11.	Yusuke Utsumi and Masahide Hojo : Basic Study on Operating Characteristics of Three-Phase Integrated Converters Considering Power Quality, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 43, Sep. 2022.
12.	Teppei Taruya and Masahide Hojo : Basic Characteristics of HVDC-Tap by Current Source Inverter for DC Power Transmission System with Line-Commutated Converters, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 42, Sep. 2022.
13.	Kenta Nishikawa, Masahide Hojo, Ryo Maeda and Ryohei Koizumi : Basic Study on Voltage Control of Distribution System Considering Widespread Use of Electric Vehicles, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 41, Sep. 2022.
14.	Masaya Ozaki, Masahide Hojo, Ryo Maeda and Ryohei Koizumi : Voltage Control of Distribution System with Many Photovoltaic Power Generation Units Considering Capacity of Storage Battery, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 40, Sep. 2022.
15.	Jin Koshizawa and Masahide Hojo : Basic Study on Power Flow Control for Multi-Terminal DC Power Transmission System with Self-Commutated Converters, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 2-6-5-2-6-6, Sep. 2022.
16.	Yusaku Tsujihara, Masahide Hojo, Ousei Ikeda and Ikki Shinozaki : Control Effect of a Stationary Battery for Virtual Power Plant under Increasing Installation Rate of PV Units, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 7-5-13-7-5-14, Sep. 2022.
17.	Hiroto Yamaguchi and Masahide Hojo : Basic Study on Multi-Terminal DC Power Transmission System with Self- and Line-Commutated Converters, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 2-6-7-2-6-8, Sep. 2022.
18.	Kyoka U and Masahide Hojo : Study on Islanding Operation of a Microgrid by Output Voltage Phase Control of Inverter Power Supply, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 6-2-11-6-2-12, Sep. 2022.
19.	Hina Shibayama and Masahide Hojo : Study on Power Quality Improvement by Grid-Connected Inverter Control in a Microgrid Considering Load-Side Inertia, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 7-1-17-7-1-18, Sep. 2022.
20.	Atsuhiro Okamoto and Masahide Hojo : Study on Output Power Adjustment of Multiple Interconnected Photovoltaic Generation Systems, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 4-1-5-4-1-6, Sep. 2022.
21.	Shohei Kureba and Masahide Hojo : Gain Setting of Output Voltage Phasor Control for Grid-Interactive Converter, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 1-2-11-1-2-12, Sep. 2022.
22.	Hibiki Iruya, Kenji Yamanaka, Ryoma Nishimura and Masahide Hojo : Evaluation of Misalignment and Transmission Characteristics in Contactless Power Transmission for EVs with Magnetic Core, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-22, MD-22, No.-39, -39, 55-58, Jan. 2022.
23.	Hiroki Yoshimoto, Kenji Yamanaka and Masahide Hojo : Cell Voltage Balancing Circuit Using Half-Bridge Inverter and LC Resonance in Odd Number of Series-Connected Cells, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-22, MD-22, No.-011, -011, 57-61, Jan. 2022.
24.	Yusaku Tsujihara, Masahide Hojo, Ousei Ikeda and Teru Miyazaki : Voltage Control under Load Fluctuation in Distribution Network with Photovoltaic Generation Systems, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 49, Sep. 2021.
25.	Shohei Kureba and Masahide Hojo : Output Control of Grid-Connected Converter for Offshore Wind Power Generation, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 51, Sep. 2021.
26.	Hiroto Yamaguchi and Masahide Hojo : Study on Multi-Terminal DC Power Transmission System with Self- and Line- Commutated Converters for Offshore Wind Power Generation, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 50, Sep. 2021.
27.	Atsuhiro Okamoto and Masahide Hojo : Study on Output Power Adjustment of Photovoltaic Generation System, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 48, Sep. 2021.
28.	Hina Shibayama and Masahide Hojo : Power Quality Improvement by Utility Interactive Inverter in Microgrid with Induction Machine Loads, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 47, Sep. 2021.
29.	Yasuyuki Hira and Masahide Hojo : Evaluation of Grid Stabilization Control with Voltage Phase Control for Distributed Energy Resources, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 46, Sep. 2021.
30.	Hiroki Taketomi, Masahide Hojo, Masayuki Watanabe and Yasunori Mitani : Estimation of Rate of Change of Frequency in East Japan Power System Based on Synchronized Phasor Measurement, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 44, Sep. 2021.
31.	Hibiki Iruya, Kenji Yamanaka, Ryoma Nishimura and Masahide Hojo : Experiment and Evaluation of Contactless Power Transmission System with Magnetic Core for EVs, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 57, Sep. 2021.
32.	Hiroki Yoshimoto, Kenji Yamanaka and Masahide Hojo : Voltage Balancing Circuit Using H-bridge Inverter and Inductor Charging and Discharging for Series Odd Cells, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 58, Sep. 2021.
33.	Takumi Yoshida and Masahide Hojo : A Study on Line-Commutated Converters in HVDC Transmission System with HVDC-Tap for Offshore Wind Power Generation, Shikoku-Section Joint Convention Record of the Institutes of Electrical and Related Engineers, 45, Sep. 2021.
34.	Takahiro Kuwamura, Kenji Yamanaka and Masahide Hojo : Tests for a Clutchless System with Shift Position Detection of an Electric Vehicle Using a Manual Transmission, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2020.
35.	Shuki Koda, Kenji Yamanaka and Masahide Hojo : Black Smoke Reduction in Diesel Engines by Using Multiple Electric Superchargers, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2020.
36.	Hiroki Yoshimoto, Kenji Yamanaka and Masahide Hojo : Cell Voltage Balancing Circuit Using H-bridge Inverter and LC for Storage Cells, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2020.
37.	Daiki Mori, Kenji Yamanaka and Masahide Hojo : Relationship between Induction Air Velocity and System Power Consumption in Plasma Actuator, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2020.
38.	Rintaro Takeshita, Kenji Yamanaka and Masahide Hojo : Consideration on Simple Modeling for Test Equipment for Skidding Using Main Motors on Trains, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2020.
39.	Hiroki Taketomi, Masahide Hojo, Masayuki Watanabe and Yasunori Mitani : An Estimation Method of Rate of Change of Frequency Based on Synchronized Phasor Measurement, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 4WEB3-15-4WEB3-16, Sep. 2020.
40.	Zhong Jian, Masahide Hojo and Kenji Yamanaka : Hierarchical Smart Method of Load Shedding in Microgrid for Islanding Operation, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 1WEB7-9-1WEB7-10, Sep. 2020.
41.	Yasuyuki Hira, Masahide Hojo and Kenji Yamanaka : Examination of Power Quality Improvement in Microgrid with Multiple Distributed Energy Resources, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 1WEB7-5-1WEB7-7, Sep. 2020.
42.	Haruki Kawano, Yuji Mishima, Kentaro Shimomachi and Masahide Hojo : Power Loss on Direct PV Power Collection System for City Tram Power Line, National Convention Record I.E.E. Japan, Mar. 2020.
43.	Masahiro Tachibana, Kenji Yamanaka and Masahide Hojo : Verification of Motion Control of Electric Vehicle by Rolling Control Using Drive Motor, National Convention Record I.E.E. Japan, Mar. 2020.
44.	Kyosuke Nakamichi, Kenji Yamanaka and Masahide Hojo : Road Surface Estimation Method for ABS by Main Motor of Electric Vehicle, National Convention Record I.E.E. Japan, Mar. 2020.
45.	Rintaro Takeshita, Kenji Yamanaka and Masahide Hojo : Consideration on Anti-Skid Method Suppressing Inertia in Driving Wheels on Trains, 第231回定例研究会資料, Dec. 2019.
46.	Rintaro Takeshita, Kenji Yamanaka and Masahide Hojo : Consideration on Anti-Skid Brake Control Equipment Using Main Motors on Trains, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 55, Sep. 2019.
47.	Kyosuke Nakamichi, Kenji Yamanaka and Masahide Hojo : Comparison of Responses of Road Surface Estimation for ABS by Main Motor of Electric Vehicle, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 54, Sep. 2019.
48.	Kazuki Okada, Kenji Yamanaka and Masahide Hojo : Charge Control Using Winding Switching Synchronous Generator for Medium-Sized Vehicles, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 53, Sep. 2019.
49.	Rikito Makino, Kenji Yamanaka and Masahide Hojo : Examination of Coupling Coefficient Estimation Method in Wireless Power Transfer, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 51, Sep. 2019.
50.	Naoki Sakamoto, Kenji Yamanaka and Masahide Hojo : Power Distribution for Multiple Loads Using Three-Phase Inverter in Wireless Power Supply System, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 52, Sep. 2019.
51.	Haruki Kawano, Yuji Mishima, Kentaro Shimomachi and Masahide Hojo : Voltage Drop on Direct Collection System of PV Using City Tram Power Line, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Sep. 2019.
52.	Sho Ishizaki, Masahide Hojo, Ryota Yamamoto and Tomoya Taima : Influence of Stationary Battery Placement on Voltage Regulation for Virtual Power Plant in Distribution System, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Sep. 2019.
53.	Keisuke Okada, Masahide Hojo and Kenji Yamanaka : Study on output smoothing of wind power turbines using their inertia, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Sep. 2019.
54.	Kaito Yasumochi, Masahide Hojo and Kenji Yamanaka : Influence of Voltage Fluctuation on Operation of Multi-Terminal DC Transmission System by HVDC-Tap, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Sep. 2019.
55.	Kyosuke Nakamichi, Kenji Yamanaka and Masahide Hojo : Road Surface Estimation for ABS by Main Motor of Electric Vehicle, Proceedings of the Japan Industry Applications Society Conference, Aug. 2019.
56.	Ryo Kobayashi, Kenji Yamanaka and Masahide Hojo : ハイブリッド自動車のMTクラッチ操作レス発進の実験, National Convention Record I.E.E. Japan, Mar. 2019.
57.	Kenta Sawada, Kenji Yamanaka and Masahide Hojo : 誘導機を用いたハイブリッドシステムの燃費向上効果の検証, National Convention Record I.E.E. Japan, Mar. 2019.
58.	Junya Ishihara, Masahide Hojo and Kenji Yamanaka : Study on Dynamic Characteristics of Load in Power System Model Including Distributed Power Supply, National Convention Record I.E.E. Japan, Mar. 2019.
59.	Masahiro Tachibana, Kenji Yamanaka and Masahide Hojo : 電気自動車の駆動用モータを用いたロール制御の実験, 第226回定例研究会資料, Dec. 2018.
60.	Fumiaki Tamura, Kenji Yamanaka and Masahide Hojo : 電動スーパーチャージャーの並列運転によるディーゼルエンジンの燃費向上実験, 第226回定例研究会資料, Dec. 2018.
61.	Kyosuke Nakamichi, Kenji Yamanaka and Masahide Hojo : 電気自動車の主電動機を用いたABSの路面検出方法の検討, 第226回定例研究会資料, Dec. 2018.
62.	Kazuki Okada, Kenji Yamanaka and Masahide Hojo : 自動車の燃費向上に向けて発電領域を拡張したオルタネータの実験特性, 第226回定例研究会資料, Dec. 2018.
63.	Shinichi Hiroshige, Kenji Yamanaka and Masahide Hojo : プラズマアクチュエータ試験用電源装置による誘導気流速度の電極形状・周波数依存性測定, 電気関係学会関西連合大会講演論文集, Dec. 2018.
64.	Sho Ishizaki, Masahide Hojo and Kenji Yamanaka : Study on Suppression of Voltage Deviation by Virtual Power Plant with Stationary Battery and Photovoltaic Generation Units, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2018.
65.	Junya Ishihara, Masahide Hojo and Kenji Yamanaka : Study on Transient Stability by Dynamic Load in Electric Power System Including Distributed Power Supply, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2018.
66.	Kohei Kobori, Masahide Hojo and Kenji Yamanaka : フライングキャパシタ形マルチレベルコンバータを用いた直流給電システムの動作検討, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2018.
67.	Hiroyuki Nakagawa, Masahide Hojo and Kenji Yamanaka : Consideration of Power Modulation by Operating Point Control of Photovoltaic Generation System, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2018.
68.	Naoki Sakamoto, Kenji Yamanaka and Masahide Hojo : 磁界共鳴を用いた複数コイルのコイル位置変化によるワイヤレス給電の効率比較, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2018.
69.	Shinichi Hiroshige, Kenji Yamanaka and Masahide Hojo : Basic Study on Miniaturization of Output-stage Filterless Sinusoidal Wave Inverter Using Coupled Inductor, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2018.
70.	Yasuto Komori, Kenji Yamanaka and Masahide Hojo : 間欠動作を適用した誘導加熱電源の加熱実験, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Sep. 2018.
71.	Kohei Kobori, Masahide Hojo and Kenji Yamanaka : Operating Characteristics of Photovoltaic Power Generation System by Flying Capacitor Multilevel Converter, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Sep. 2018.
72.	Yasuto Komori, Kenji Yamanaka and Masahide Hojo : パルス密度変調を適用した誘導加熱電源の金属加熱実験, Proceedings of the Japan Industry Applications Society Conference, Aug. 2018.
73.	Shinichi Hiroshige, Kenji Yamanaka and Masahide Hojo : 出力段フィルタレス正弦波インバータのディジタル制御系設計と実機検証, Proceedings of the Japan Industry Applications Society Conference, Aug. 2018.
74.	Rikito Makino, Kenji Yamanaka and Masahide Hojo : 非接触給電における位置ずれと給電電流の相関特性, Proceedings of the Japan Industry Applications Society Conference, Aug. 2018.
75.	Xiao Yan, Baohui Zhang, Masahide Hojo and Kenji Yamanaka : Impact of Distributed Energy Resources to Protective Relaying of Distribution Network, National Convention Record I.E.E. Japan, Mar. 2018.
76.	Hibiki Kawaguchi, Masahide Hojo, Kenji Yamanaka, Toshihisa Funabashi and Takeyoshi Kato : Power Quality Improvement by Inverter Power Supply for Microgrid with Induction Machine, National Convention Record I.E.E. Japan, Mar. 2018.
77.	Kohei Kobori, Masahide Hojo and Kenji Yamanaka : Operating Characteristics of DC Power System by Flying Capacitor Multilevel Converter, National Convention Record I.E.E. Japan, Mar. 2018.
78.	Shinichi Hiroshige, Kenji Yamanaka and Masahide Hojo : Comparative Experimental Study on Output-stage Filter-less Three-phase Sinusoidal Inverter and Three-phase PWM Sinusoidal Inverter, National Convention Record I.E.E. Japan, Mar. 2018.
79.	Yasuto Komori, Kenji Yamanaka and Masahide Hojo : Experimental Characteristics of Resonant Frequency Variable Induction Heating Power Supply, National Convention Record I.E.E. Japan, Mar. 2018.
80.	Ryo Kobayashi, Kenji Yamanaka and Masahide Hojo : HEVの自動運転に向けたクラッチ操作レス運転の実験特性, 第221回定例研究会資料, Dec. 2017.
81.	Junya Ishihara, Masahide Hojo and Kenji Yamanaka : Basic study on Energy Management using PHEV and Photovoltaic Generation System, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 46, Sep. 2017.
82.	Kohei Kobori, Masahide Hojo and Kenji Yamanaka : Operating Characteristics of Storage Battery Using Flying Capacitor Multilevel Converter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 45, Sep. 2017.
83.	Go Nakai, Masahide Hojo and Kenji Yamanaka : Voltage Control on Low Voltage Distribution Line with Unbalanced Load by Photovoltaic Generation Systems, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 44, Sep. 2017.
84.	Hiroyuki Nakagawa, Masahide Hojo, Kenji Yamanaka, Toshihisa Funabashi and Takeyoshi Kato : Grid-Connected Operation of Voltage Source Inverter with Photovoltaic Generation System and Energy Storage, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 43, Sep. 2017.
85.	Nozomu Isobe, Kenji Yamanaka and Masahide Hojo : Traveling Test of Clutch-Less Shift Change in Electric Vehicle with Manual Transmission, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 56, Sep. 2017.
86.	Kenta Sawada, Kenji Yamanaka and Masahide Hojo : Verification of Operation of Hybrid System Using Induction Motor, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 55, Sep. 2017.
87.	Takuya Nosho, Kenji Yamanaka and Masahide Hojo : Investigation of High Voltage Mild Hybrid System for Small Vehicle with Supercharger, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 54, Sep. 2017.
88.	Shinichi Hiroshige, Kenji Yamanaka and Masahide Hojo : Technology Education of Power Electronics including Experiment of Converter Circuit, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 52, Sep. 2017.
89.	Yasuto Komori, Kenji Yamanaka and Masahide Hojo : Efficiency Measurement Depending on Resonant Capacitors in Power Supply for Induction Heating, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 53, Sep. 2017.
90.	Atoshi Sumitada, Masahide Hojo and Kenji Yamanaka : Experimental Verification of Multi-Terminal Receiving Ends Circuit for DC Power Supply System, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Sep. 2017.
91.	Yushi Miura, Hiroki Ishikawa, Masaki Eguchi, Masayuki Hattori, Eiji Hiraki, Masahide Hojo and Keiju Matsui : Research Trend of DC/AC Conversion Circuit for Various Distribution Generators, Proceedings of the Japan Industry Applications Society Conference, Aug. 2017.
92.	Nozomu Isobe, Kenji Yamanaka and Masahide Hojo : Clutch-less Electric Vehicle with Manual Transmission, Proceedings of the Japan Industry Applications Society Conference, Aug. 2017.
93.	Yasuto Komori, Kenji Yamanaka and Masahide Hojo : Comparison of Characteristics of Resonant Capacitor in Induction Heating Power Supply, Proceedings of the Japan Industry Applications Society Conference, Aug. 2017.
94.	Shinichi Hiroshige, Kenji Yamanaka and Masahide Hojo : Three-Phase Sinusoidal-wave Inverter without Output Filter Circuit, Proceedings of the Japan Industry Applications Society Conference, Aug. 2017.
95.	Yuya Yamaoka, Kenji Yamanaka and Masahide Hojo : Series-Parallel duty change of the AC generator with Series-Parallel Winding Switching, National Convention Record I.E.E. Japan, Vol.4, No.251, Mar. 2017.
96.	Shuhei Uchida, Kenji Yamanaka and Masahide Hojo : Verification experiments of Hybrid system using double winding Synchronous Generator, National Convention Record I.E.E. Japan, Vol.4, No.246, Mar. 2017.
97.	Naoto Yamane, Kenji Yamanaka and Masahide Hojo : オルタネータハイブリッドの実車走行による燃費向上効果の検証, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.8, Sep. 2016.
98.	Masato Yamagami, Kenji Yamanaka and Masahide Hojo : R-D コンバータを用いた巻線界磁型同期電動機のセンサレス駆動実験, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.7, Sep. 2016.
99.	Shuhei Uchida, Kenji Yamanaka and Masahide Hojo : 二重巻線を有する同期発電機の運転特性, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.6, Sep. 2016.
100.	Kenta Tsutsui, Kenji Yamanaka and Masahide Hojo : HEV のMG を用いたTraction Control の効果検証, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.5, Sep. 2016.
101.	Yuya Yamaoka, Kenji Yamanaka and Masahide Hojo : 双方向スイッチを用いた直並列巻線切り替えを導入した交流電動機の負荷試験, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.4, Sep. 2016.
102.	Daishi Shimakawa, Kenji Yamanaka and Masahide Hojo : 出力段フィルタレス単相正弦波インバータの効率検討, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.3, Sep. 2016.
103.	Shota Inomata, Kenji Yamanaka and Masahide Hojo : 共振型電圧均等充電回路の実機検討, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.1, Sep. 2016.
104.	Atoshi Sumitada, Naoya Okada, Masahide Hojo and Kenji Yamanaka : 2台の直流タップ回路を応用した多端子直流給電システムの動作特性, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Sep. 2016.
105.	Masato Yamagami, Kenji Yamanaka and Masahide Hojo : R-D コンバータを用いた巻線界磁型同期電動機のセンサレス制御の検討, Proceedings of the Japan Industry Applications Society Conference, Aug. 2016.
106.	Kenta Tsutsui, Kenji Yamanaka and Masahide Hojo : ハイブリッド自動車のモータジェネレータを用いたトラクションコントロールにおける駆動力の測定実験, Proceedings of the Japan Industry Applications Society Conference, Aug. 2016.
107.	Shuhei Uchida, Kenji Yamanaka and Masahide Hojo : 二重巻線を有する同期発電機を用いたハイブリッドシステムへの検討, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, 141, Aug. 2016.
108.	Daishi Shimakawa, Kenji Yamanaka and Masahide Hojo : Experimental Study on Output-Stage Filter-Less Single-Phase Sinusoidal Inverter, National Convention Record I.E.E. Japan, Vol.4, No.084, Mar. 2016.
109.	Naoto Yamane, Kenji Yamanaka and Masahide Hojo : Verification of Fuel Economy Improvement by Extension of Engine Assist area on Alternator-Hybrid, National Convention Record I.E.E. Japan, Vol.4, No.212, Mar. 2016.
110.	Naoya Okada, Masahide Hojo and Kenji Yamanaka : 直流給電システムにおける改良型多端子受電回路の受電端電圧特性, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.2, 51, Sep. 2015.
111.	Takahiro Ise, Masahide Hojo and Kenji Yamanaka : 大容量PV連系時における配電線電圧上昇抑制と直列リアクトルの効果, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.1, 50, Sep. 2015.
112.	Kenta Tsutsui, Kenji Yamanaka and Masahide Hojo : 電気式4WDのトラクションコントロール走行試験, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.13, 69, Sep. 2015.
113.	Takeshi Kawakami, Kenji Yamanaka and Masahide Hojo : 走行用電動機を用いたAntilock Brake Systemの路面走行試験, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.12, 68, Sep. 2015.
114.	Ryota Machida, Kenji Yamanaka and Masahide Hojo : キャパシタを用いた電動車両における蓄電池の負担低減法, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.11, 67, Sep. 2015.
115.	Kazutaka Mizota, Kenji Yamanaka and Masahide Hojo : 直列接続されたリチウムイオン二次電池における共振型電圧均等充電回路の実験特性, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.10, 66, Sep. 2015.
116.	Masato Yamagami, Kenji Yamanaka and Masahide Hojo : 巻線界磁型同期電動機のセンサレス化におけるフィルタ設計, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.9, 65, Sep. 2015.
117.	Naoto Yamane, Kenji Yamanaka and Masahide Hojo : 矩形波駆動による巻線界磁型同期電動機の定出力特性, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.8, 64, Sep. 2015.
118.	Yuya Yamaoka, Kenji Yamanaka and Masahide Hojo : トライアックを用いた交流電動機の直並列巻線切り替え, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.7, 63, Sep. 2015.
119.	Zian Wang, Masahide Hojo and Kenji Yamanaka : 三相電源電圧不平衡下での PLL 回路の検討, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.6, 62, Sep. 2015.
120.	Daishi Shimakawa, Kenji Yamanaka and Masahide Hojo : 出力段フィルタレス単相正弦波インバータの出力安定化, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.5, 61, Sep. 2015.
121.	Kazutaka Mizota, Kenji Yamanaka and Masahide Hojo : Resonant Voltage Equalizer for Electric Double-Layer Capacitor Cells, Proceedings of the Japan Industry Applications Society Conference, Vol.1, 365-366, Sep. 2015.
122.	Naoto Yamane, Kenji Yamanaka and Masahide Hojo : Examination of a Hybrid System Using an Alternator, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, 133, Sep. 2015.
123.	Daishi Shimakawa, Kenji Yamanaka and Masahide Hojo : Single-Phase Sine-Wave Inverter without Filter Circuit, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, 12, Sep. 2015.
124.	Shotaro Hirose, Masahide Hojo and Kenji Yamanaka : Study on Operating Characteristics of Three-Phase Integrated Converter Considering Constraints of Switching Frequency, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Aug. 2015.
125.	Takahiro Ise, Masahide Hojo and Kenji Yamanaka : Voltage Rise Suppression in Distribution System with Low and High Power PV Units by Using a Series Reactor, National Convention Record I.E.E. Japan, Vol.6, No.184, 300, Mar. 2015.
126.	Takeshi Kawakami, Kenji Yamanaka and Masahide Hojo : Consideration of a Control Method in Antilock Brake System Using an Electric Motor for Vehicle, National Convention Record I.E.E. Japan, Vol.4, No.221, 374, Mar. 2015.
127.	Kenji Yamanaka, Jun Sumiyoshi and Masahide Hojo : Experimental Characteristic by Twin Inverter of Double Winding Synchronous Generator, National Convention Record I.E.E. Japan, Vol.4, No.220, 373, Mar. 2015.
128.	Ryota Machida, Kenji Yamanaka and Masahide Hojo : Load Reduction Method of Storage Battery with EDLC on Electric Vehicle by Using 120 degree conduction BLDC, National Convention Record I.E.E. Japan, Vol.4, No.092, 155, Mar. 2015.
129.	Kazutaka Mizota, Kenji Yamanaka and Masahide Hojo : Resonant Voltage Equalizer for EDLC Cells Using Full-Bridge Inverter, National Convention Record I.E.E. Japan, Vol.4, No.091, 154, Mar. 2015.
130.	Naoya Okada, Masahide Hojo and Kenji Yamanaka : Characteristics of Improved Multi-Terminal Receiving Circuit for DC Power Supply System, National Convention Record I.E.E. Japan, Vol.4, No.088, 150, Mar. 2015.
131.	Naoya Okada, Masahide Hojo and Kenji Yamanaka : 直流給電システムにおける多端子受電回路の改良とその動作検討, Kansai-section Joint Convention of Institutes of Electrical Engineering, Nov. 2014.
132.	Kohki Aida, Masahide Hojo and Kenji Yamanaka : 系統連系インバータの出力電圧位相調整に基づくマイクログリッドの電力品質向上, Kansai-section Joint Convention of Institutes of Electrical Engineering, Nov. 2014.
133.	Kenji Yamanaka, Kazutaka Mizota and Masahide Hojo : Individual Charge Characteristics of Battery using Resonated Circuit, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 74, Sep. 2014. (Summary) ハンドヘルド機器や電気自動車など，蓄電池(以後電池)を直列に接続し，必要な電圧にして使用されるが，使用を重ねるにつれて各電池の個体差などによって，電圧にばらつきが発生する．これは，電池モジュールの性能を著しく低下させる原因となり，個々のセルを均等にする回路が必要となる．本稿ではLC共振を利用した充電回路を試作し，直列に接続された電池のうち，電位の低い電池のみ個別充電し，均等化すること確認ができたので報告する．
134.	Kazutaka Mizota, Kenji Yamanaka and Masahide Hojo : Experimental Characteristics of Resonant Voltage Equalizer for Series-connected non-Uniform Capacitance cells, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 75, Sep. 2014. (Summary) 電気二重層キャパシタ(EDLC)やリチウムイオン二次電池を電気自動車や系統のロードレベリングなどに使用する場合，複数個の蓄電セルを直列に接続して使用する．しかし各セル容量の個体差や劣化などにより，セル電圧にばらつきが発生する．このばらつきを防止するために，様々な電圧均等充電回路が提案されている．本稿では共振を用い昇圧動作する均等充電回路を試作し，直列に接続したキャパシタの静電容量が異なる場合の充電特性を実験により確認したので報告する．
135.	Takumi Kanbara, Kenji Yamanaka and Masahide Hojo : Examination of High-Frequency Circuit by Multiple Switching Using Three Phases IGBT Module, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 72, Sep. 2014. (Summary) 電力用機器にはパワーデバイスが用いられており，産業や家庭等に広く普及している．これらの機器は更に大電力化や小型化の要求があり，パワーデバイスにも大電力と小型化が求められている．そこで筆者らは，高周波回路を提案し基本動作の確認や効率の向上を行った．本稿では，多重化に向けた実験及び三相IGBTモジュールを用いた高周波回路の検討を行ったので報告する．
136.	Ryota Machida, Kenji Yamanaka and Masahide Hojo : Comparison Examination of 120-degree Conduction with Regeneration And Hall Signal Interpolation Function System Vector Control, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 71, Sep. 2014. (Summary) メンテナンスフリーや小型・高効率化の需要の高まりから電動機に永久磁石同電動機が多く扱われている．この電動機の駆動には，磁極位置の検出にレゾルバ・エンコーダ・ホール素子が用いられる．筆者らはこれまで最も安価でコンパクトといった特徴を持つホール素子に注目してきた．一般的にホール素子は，60度毎でしか磁極位置を検出できない．しかし位相情報に補完制御を加えることで格段に解像度を上昇させることが可能である．本稿では，先行研究である120度通電方式による回生動作と補完制御を組み合わせることで，ホール素子による高分解能回生制御システムの有効性を確認したので報告する．
137.	Kentaro Hada, Kenji Yamanaka and Masahide Hojo : Experimental Examination for Dual Control of Load Test Equipment Type Disc Brake, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 70, Sep. 2014. (Summary) ハイブリッド車といった電気自動車などには高出力，高トルクの永久磁石同期電動機が使われている．この電動機をM-Gsetの構成とすると，大きなサーボシステムが必要となることから摩擦ブレーキを用いた負荷試験装置の試作を検討した．しかし高トルク対応の摩擦ブレーキユニットの入手性に問題があり，本研究室では比較的安価な自動車部品を用い，運転試験等を進めてきた．本稿では，これまで一つの直動シリンダモータによって左右のディスクブレーキの油圧を制御し負荷試験を行ってきたが，左右で負荷に差が生じた場合，電動機ユニット内のデファレンシャルギアの働きで制御が困難となる問題があった．そこで，各ディスクブレーキを二つの直動シリンダモータを用いて制御することで，この問題が改善されたので報告する．
138.	Jun Sumiyoshi, Kenji Yamanaka and Masahide Hojo : Experimental Examination of Twin-Inverter Control of the SC Alternator, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 69, Sep. 2014. (Summary) 自動車の低燃費志向の高まりにより数々の燃費低減策が打たれており，ハイブリッド自動車が解決策の一つとされている．筆者らは，従来のハイブリッドシステムと比べ，安価かつ省スペースで燃費向上効果が期待できるオルタネータを用いたハイブリッドシステムについて検討してきた．本稿では，セグメントコンダクタ式オルタネータ(以下SCオルタネータ)を二つのインバータを用いる方式を提案し，実機による動作結果が得られたので報告する．
139.	Jun Fujimoto, Kenji Yamanaka and Masahide Hojo : Examination of Boost High Rotation Method Using a Neutral Point of Motor, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 68, Sep. 2014. (Summary) 筆者らはこれまで，車両用電動タービンについて研究を進めてきた．車両に用いられる電源電圧は決められており，これにより電動機の回転速度も制限される．高回転化するには，昇圧回路を外部に用いる方法などが挙げられるが，インダクタなど部品点数が増加し，重量や，コスト，スペース等の増大が問題となる．本稿では，電動機の中性点を用いて，昇圧動作をおこない，簡単な構成で電動機の高回転化について検証したので報告する
140.	Takahiro Komatsu, Kenji Yamanaka and Masahide Hojo : Experimental Examination of square wave Sensor-less Control of BLDC, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 67, Sep. 2014. (Summary) 近年，省エネの観点から同期電動機(PMモータ・BLDCモータ)の需要が高まりつつある．また，産業界全般で電動機の高速化が進んでおり，高速化に適した駆動制御法について様々な研究が行われている．筆者らは高速化に適した駆動制御法として120度通電方式に注目してきた．本稿では120度通電方式の矩形波センサレス制御の提案を行い，シミュレーションと実機による動作結果が得られたので報告する．
141.	Takahiro Kurioka, Masahide Hojo and Kenji Yamanaka : Suppressing Voltage Variation in Distribution Network during Night Time by Utility Interactive Inverters of Photovoltaic Generation Systems, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 62, Sep. 2014. (Summary) 近年，太陽光発電システムの系統連系が急速に進んでいる．一方，夜間軽負荷時には，工場等の力率改善用コンデンサによるフェランチ効果に起因する電圧上昇が問題となる場合がある．本稿では，夜間には完全に空き容量となる系統連系インバータを用いた無効電力制御により，この電圧上昇を抑制する方法を検討した結果について述べる．
142.	Junnya Yokoyama, Masahide Hojo and Kenji Yamanaka : Assessment of Power Distribution System Monitoring by Disconnection of Utility Interactive Inverters, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 63, Sep. 2014. (Summary) 近年，需要家側への導入が進んでいる分散電源について，これらの系統擾乱に対する過渡応答や，検討が進められているデマンドレスポンスまで含めると，低コストで効果的な配電系統での状態把握技術の必要性が高まってくると考えられる．筆者らは，これまで高圧配電系統の末端においてV‐I特性から負荷状態を推定する方法を検討してきた．本稿では，電圧低下時に太陽光発電システム(PV)用系統連系インバータが解列した場合に状態推定に与える影響をシミュレーション解析により検討した結果について述べる．
143.	Takahiro Ise, Masahide Hojo and Kenji Yamanaka : Comparison of Series Reactor Insertion and Battery Control in Line Voltage Regulation, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, 58, Sep. 2014.
144.	Kouhei Ohkusa, Masahide Hojo and Kenji Yamanaka : Voltage Control of the Low Voltage Distribution System at the End of Distribution Line by Photovoltaic Generation Systems, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.2, 59, Sep. 2014. (Summary) 近年，太陽光発電システム(PV)の導入増加に伴い配電系統の電圧変動が懸念されている．特に一般住宅用の小容量PVの導入が加速していることから，高圧配電系統に問題が生じる以前に柱上変圧器以下の低圧配電系統において電圧逸脱が生じる可能性がある．筆者らは低圧配電系統において系統連系インバータの無効電力制御により電圧逸脱を防止する方法を検討してきた．本稿では，配電用変電所から最も離れた地点にある低圧配電系統での電圧制御とその効果ついて述べる．
145.	Takayuki Kimura, Eiji Shintani, Kouichiro Kouno, Eiji Nakanishi, Yoshiaki Nagano and Masahide Hojo : Study on Reactive Power Control for Suppressing Voltage Variation with Large Penetration of Photovoltaic Generation Systems, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 15-16, Sep. 2014.
146.	Kouhei Ohkusa, Masahide Hojo and Kenji Yamanaka : Effect of Series Reactor and Voltage Control in Low Voltage Distribution System with Photovoltaic Generation Systems, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Sep. 2014.
147.	Junnya Yokoyama, Masahide Hojo and Kenji Yamanaka : Comparison of Load Characteristics Including Operation of Utility Interactive Inverters in Power Distribution System with Distributed Generators, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Sep. 2014.
148.	Takahiro Ise, Masahide Hojo and Kenji Yamanaka : Basic Study of Voltage Control on Distribution Line with a Series Reactor and Batteries, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.3, No.1, 58, Sep. 2014. (Summary) 近年，太陽光発電システム(PVシステム)への高い期待とともに，その導入量が増加している．一方で，発電電力が逆潮流を生じる場合には，受電端電圧の上昇が懸念される．PVシステム出力は，時々刻々変化するため，即応性の高い制御が求められる．電圧上昇の対策としては，PVシステムの系統連系インバータを用いた無効電力制御が考えられる．本稿では，この無効電力制御効果を高めるために直列リアクトル挿入を行った場合と，出力抑制に代わる対策として蓄電池制御を行った場合の配電線電圧制御の効果比較について述べる
149.	Kohki Aida, Masahide Hojo and Kenji Yamanaka : Load Terminal Voltage Regulation by Utility Interactive Inverter with Its Output Voltage Phasor Control, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Sep. 2014.
150.	Takumi Kanbara, Kenji Yamanaka and Masahide Hojo : Experimental Examination of High-Frequency Circuit Using IGBT, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.70, 309-310, Aug. 2014. (Summary) Power devices are utilized in power equipment. It is widely used in household and industrial. Miniaturization and high power are demanded in these devices. The IGBT is suitable for high power. However, miniaturization is difficult because the switching frequency of the IGBT is several 10 kilohertz. The authors propose the high-frequency circuit using the IGBT, and then confirm the operation in load change.
151.	Kenji Yamanaka, Mizota Kazutaka and Masahide Hojo : Prototype and Experimental Characteristics of Resonant Equalization Charge Circuit of Battery, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.20, 121-122, Aug. 2014. (Summary) Lithium-ion battery of high energy density is often used in the battery of equipment such as electric vehicles and hand-held equipment, the reduction in size and weight is required. The lithium ion battery is cited each change and deterioration of the capacity of each cell. The variation occurs in the cell voltage by this problem. When this variation is large, it causes lowering of the performance of the battery module. Therefore, it is necessary to charge uniformly the individual cells. We report confirmed the effectiveness of the proposed method by making the resonant equalization charge circuit experimentally and charging the lithium-ion battery.
152.	Takeshi Kawakami, Kenji Yamanaka and Masahide Hojo : Verification of ABS using an electric car, Proceedings of the Japan Industry Applications Society Conference, Y-117, Aug. 2014. (Summary) 現在の自動車には衝突防止システムなど様々な安全機能が搭載されており，電気自動車にはその安全機能に加えて駆動アシスト用の電動機が搭載されている．これを安全性能面においても活用するために，電動機を用いたABS(Antilock Brake System)を考案した．本稿では実験により提案システムにおいても油圧式と同様の動作が確認できたので報告する．
153.	Ryota Machida, Kenji Yamanaka and Masahide Hojo : Regeneration characteristic of the motor using by 120 degree conduction, Proceedings of the Japan Industry Applications Society Conference, Y-98, Aug. 2014. (Summary) メンテナンスフリーや小型・高効率化の需要の高まりから，電動機に永久磁石同期電動機が多く扱われている．この電動機の運転には，磁極位置の検出にレゾルバ・エンコーダ・ホール素子が用いられる．その中でも最も安価でコンパクトといった特徴を持つホール素子に注目した．ホール素子の一般的な制御法では，回路構成が簡便であるため，回生動作等複雑な制御が困難である．本研究ではホール素子を用いて回生動作が可能な制御システムを提案しその有効性を確認したので報告する．
154.	Kazutaka Mizota, Kenji Yamanaka and Masahide Hojo : Experimental Characteristics of Resonant Voltage Equalizer for EDLC Cell, Proceedings of the Japan Industry Applications Society Conference, Y-53, Aug. 2014. (Summary) 電気二重層キャパシタ(EDLC)やリチウムイオン二次電池を電気自動車や系統のロードレベリングなどに使用する場合，蓄電セルを複数個直列に接続して使用する．しかし各セルの容量のばらつきや個々劣化などにより，セル電圧にばらつきが発生する．このばらつきを防止するために，電圧均等充電回路が用いられる．本稿では共振を利用した昇圧動作する均等充電回路を試作し，実験により動作の確認できたので報告する．
155.	藤本純, Kenji Yamanaka and Masahide Hojo : 黒煙検出法を用いたディーゼルエンジンの電動ターボシステムの検討, National Convention Record I.E.E. Japan, Mar. 2014. (Summary) 近年，環境問題からエンジンの排出ガスに含まれる有害物質の低減が望まれている．特にディーゼルエンジンの排出ガスには，NOXや黒煙が含まれており，排出ガス規制も厳しくなってきている．黒煙の削減には，ターボシステムやDPF(Diesel particulate filter)などが用いられている．筆者らはターボシステムに注目し，本稿ではブラシレスDCモータを用いてディーゼルエンジンの電動ターボシステムの検討をおこなったので報告する．
156.	神原拓己, Kenji Yamanaka and Masahide Hojo : Si-IGBTを用いた高速スイッチング回路の実験特性, National Convention Record I.E.E. Japan, Mar. 2014. (Summary) 近年，多くの装置や機器にパワーデバイスが用いられており，産業や家庭等に広く普及している．これらが普及した最大の理由としては小型化である．しかしながらSi-IGBTは一般的には大電流・高耐圧に適したパワーデバイスであるが，スイッチング周波数の限界が数十kHz程度であることから小型化に限界があった．本稿では，提案するシステムを昇圧チョッパ回路に適応し昇圧動作を行った．
157.	河野高一郎, 中西英治, 浅井正行, Toshihiro Kujime, 永野賢朗 and Masahide Hojo : 太陽光発電が連系された配電系統の有効・無効電力推定の検討, National Convention Record I.E.E. Japan, Mar. 2014.
158.	Kouhei Ohkusa, Masahide Hojo and Kenji Yamanaka : 柱上変圧器の漏れリアクタンスを考慮した低圧配電系統の電圧制御, National Convention Record I.E.E. Japan, Mar. 2014. (Summary) 近年，太陽光発電システム(PV)の導入が加速しているとともに配電系統の電圧変動が懸念されている．住宅地などの低圧配電系統には，主に小容量PVが連系されることが多く，高圧配電系統に問題が生じる以前に柱上変圧器以下の低圧配電系統において電圧逸脱や電圧不平衡が生じる可能性があり，筆者らもこの問題について検討を行ってきた(1)．本稿は，PV導入時の低圧配電系統を想定し，柱上変圧器の漏れリアクタンスの効果を考慮したうえでPV用単相インバータの無効電力制御について検討したものである．
159.	Junnya Yokoyama, Masahide Hojo and Kenji Yamanaka : 分散電源を含む配電系統における負荷特性の状態推定法, National Convention Record I.E.E. Japan, Mar. 2014. (Summary) 近年，電力系統システムの拡大，複雑化により，動特性の把握が困難になっており，それに伴いシステム内の状態把握の技術の必要性が高まっている．本稿では，系統末端におけるV‐I特性から負荷状態を推定する方法を検討した結果について述べる．
160.	秦健太郎, Kenji Yamanaka and Masahide Hojo : 負荷試験装置(電動機)の冷却試験および耐負荷量の検証, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.5, Sep. 2013. (Summary) 環境問題の意識の高まりから，ハイブリッド車といった電気自動車などには永久磁石同期電動機が使われており，出力は数十kW，トルクは数百Nmを発生する物が多い．この電動機試験をM-Gsetの構成とすると，大きなサーボシステムが必要となることから摩擦ブレーキを用いた負荷試験装置の試作を検討した．しかし高トルク対応の摩擦ブレーキユニットの入手性に問題があり，本研究室では比較的安価な自動車部品を用い，負荷試験装置の試作，運転試験等を進めてきた．本稿では，負荷試験装置の構成について述べ，これを用いて負荷試験を長時間行った場合，ディスクブレーキが高温状態となるため冷却が必要となることから，水冷式で冷却することで温度上昇を大きく抑えることができたので報告する．また，この負荷試験装置が測定できる自動車の燃費を計算し，どのような自動車まで測定できるかを検証した．
161.	藤本純, Kenji Yamanaka and Masahide Hojo : ディーゼルエンジンの黒煙検出システムによる電動タービン駆動実験, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.4, Sep. 2013. (Summary) 近年，環境問題からエンジンの排出ガスに含まれる有害物質の低減が望まれている．特にディーゼルエンジンの排出ガスには，NOXや黒煙などが多く含まれており，排出ガス規制も厳しくなってきている．黒煙の削減には，ターボシステムやフィルタなどが用いられる．ターボシステムには機械式と電動式があり，機械式では排出ガスを利用し過給を行うため，応答性に問題がある．一方電動式では，電動タービンにより過給を行うため応答性が良く，筆者らはこれまでディーゼルエンジンの電動ターボ化による黒煙減少システムの提案をしてきた．図1にその提案システムを示す．以前，ディーゼルエンジンに過給を行うことにより黒煙の減少を確認した．本稿では，黒煙検出システムを用いて電動タービン駆動の実験を行ったので報告する．
162.	Kenji Yamanaka, 小松誉宙 and Masahide Hojo : 120 度通電ブラシレスDC モータの励磁制御, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.2, Sep. 2013. (Summary) 永久磁石同期電動機の運転方法で120度通電による矩形波運転があげられる．これはブラシレスDCモータと呼ばれ，簡単・低コスト・小型であることが特徴である．しかし，ベクトル制御や正弦波駆動と比較して，回生(発電)運転や弱め磁束制御等が困難であり(2)，トルク制御等を必要としない簡単な装置や機器に用途が限られている．またホール信号を補間することにより，ベクトル制御を行う方法等があるが，加速減速時の問題や制御システム等，複雑になる問題がある．本稿ではホール素子を用いた120度通電の矩形波運転で，回生動作及びトルク制御，励磁制御方法について提案し，実験にて確認したので報告する．
163.	Junnya Yokoyama, Masahide Hojo and Kenji Yamanaka : 配電系統における電圧位相計測への誘導機負荷による影響評価, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.6, Sep. 2013. (Summary) 近年，大規模電力系統における動特性をオンラインで観測する技術の重要性が高まっている．これまでの研究で，需要家端での計測であっても，適切な処理を施すことで，広域系統の現象の把握が可能なことを確かめているが，配電系統の負荷状態や分散電源の有無が及ぼす影響については明らかにされていない．本稿では，配電系統に誘導機負荷が接続された場合に，送出と末端の電圧位相差と周波数偏差の計測結果が受ける影響を評価する．
164.	Kouhei Ohkusa, Masahide Hojo and Kenji Yamanaka : 太陽光発電システムを用いた低圧配電系統における電圧制御とその効果, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.5, Sep. 2013. (Summary) 近年，太陽光発電システム(PV)の導入が進む一方で，配電系統の電圧変動が懸念されている．小容量PVは主に住宅地などの低圧配電系統に連系されることが多く，高圧配電系統に問題が生じる以前に柱上変圧器以下の低圧配電系統において電圧逸脱や電圧不平衡が生じる可能性がある．本稿は，PV導入時の単相3線式の低圧配電系統を想定し，その電圧制御においてPV用単相インバータの無効電力制御を活用する方法を検討したものである
165.	Tomoya Nishioka, Masahide Hojo and Kenji Yamanaka : 直流給電システムにおける多端子受電回路の受電電力不均等下の特性評価, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.10, Sep. 2013. (Summary) 近年，太陽光発電の導入が進んでおり，さらに蓄電池を利用した給電システムも注目され，ビル等において直流による給電を行う例も見られるようになってきた．筆者らはHigh Voltage DC Tap (HVDC Tap) という回路方式を応用し，電圧脈動抑制を目的としたHVDC Tapを2台直列に接続するという，直流給電システムにおける新たな受電回路方式を提案してきた．本稿では，2台のTapによって引き出す電力がそれぞれ異なる場合に，主負荷の電圧脈動に与える影響を述べる．
166.	Yuji Ohfuchi, Masahide Hojo and Kenji Yamanaka : 異容量太陽光発電システムの組み合わせ無効電力制御による配電線電圧制御, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.3, Sep. 2013. (Summary) 近年，太陽光発電(PV)の導入量増加に伴い配電系統の電圧変動が懸念されているが，配電線電圧は電気事業法で定められている適正電圧範囲(101±6V)に収める必要がある．しかし，大容量PVが配電系統に連系されるような場合には，その系統連系インバータを用いて無効電力制御を行えば，効果的な電圧制御を実現できる可能性がある．本研究では小容量のPVシステムが均等に連系された状態に加えて，ある一箇所に連系された大容量PVの無効電力制御とその効果を考える．
167.	Hidekadu Takeda, Masahide Hojo and Kenji Yamanaka : 系統連系インバータ群の無効電力制御および蓄電池充電を併用した受電端電圧制御, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.1, Sep. 2013. (Summary) 分散型電源の多数台導入により受電端電圧が適正電圧範囲を超える恐れが指摘されている．筆者らは，系統連系インバータの無効電力制御に加えて蓄電池の充電を併用することで電圧逸脱を防止する方法を検討してきた．無効電力制御は力率低下の許容量でその効果が異なる．本稿では，受電端電圧の逸脱幅に応じて最低力率を変化させる無効電力制約を行った場合の蓄電池充電の効果について述べる．
168.	Tomoya Masuda, Masahide Hojo and Kenji Yamanaka : 系統連系インバータの多様性を考慮した準集中無効電力制御方式の一日の運用効果, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.2, Sep. 2013. (Summary) 太陽光発電システムが多数台連系される際に，配電線電圧の上昇が懸念されている．この電圧上昇の対策の一つとして，太陽光発電システムの系統連系インバータの無効電力制御を行う方法が挙げられる．しかし，現在の系統連系インバータには外部制御信号を受けつけるような通信機能がなく，また力率には制約が設けられていて，無効電力制御の可能な範囲は限られている．これまで筆者らは，多数台の系統連系インバータを制御する方法として，準集中制御方式を検討し，新たな制御方法を提案した．これにより，柱上変圧器以下の電圧情報のみを用いて，負荷変動などにより電圧が適正範囲内に収まった場合には無効電力出力を止め，無効出力が十分の場合には出力量を緩めることが可能となった．本稿ではこれを用いて，一日を通しての負荷変動とPV発電出力を考慮し，1時間おきの各node電圧について検討した結果について述べる
169.	Kenji Yamanaka, Tokuo Ohnishi and Masahide Hojo : 誘導同期リラクタンス電動機を用いたハイブリッド自動車の実験特性, Proceedings of the Japan Industry Applications Society Conference, Vol.4, No.1, 85-86, Aug. 2013. (Summary) The PM motor has become increasingly popular for many applications. However, there is an acquisition problem of a rare earth permanent magnet. Therefore, the research of a motor which does not use these magnets is also prosperous. We developed the motor engine hybrid car of prototype driven by an AC Synchronous Motor (SM) using the developed an inverter. This EV was remade from an available standard car. The EV is reconstructed by an IMsynRM (15kW) and SPMSM(10kW), The lead acid battery (300V, 16Ah) and the handmade inverter unit using IGBT devices (Generator unit 600V, 400A and motor unit 600V 600A). Total weight of the EV is about 1600kg. In this paper, we introduce the purpose and process and production of this motor hybrid vehicles.
170.	河野高一郎, 中西英治, 永野賢朗, Tadao Nagase, Masahide Hojo and Tokuo Ohnishi : メガソーラー発電システムの力率一定制御による電圧変動抑制効果の実証, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Aug. 2013. (Summary) メガソーラー発電が配電系統に連系された場合の電圧変動抑制対策として，パワーコンディショナの力率一定制御の適用が検討されている．<br> これまでのシミュレーション結果から連系箇所が変電所から5km程度のケースであれば，出力変動に伴う線路ロス変動は小さく，力率一定制御により電圧変動は十分抑制される見通しを得ている．<br> 今回，6.6kVの実系統において試験を実施し，その結果，シミュレーション結果と同様，力率一定制御により電圧変動が効果的に抑制されることを確認した．
171.	Jun Fujimoto, Kenji Yamanaka and Masahide Hojo : ディーゼルエンジンの電動ターボ化による黒煙減少システム, Proceedings of the Japan Industry Applications Society Conference, Y-135, Aug. 2013. (Summary) 近年，環境問題からエンジンの排出ガスに含まれる有害物質の低減が望まれている．特にディーゼルエンジンの排出ガスには，NOxや黒煙などが多く含まれており，排出ガス規制も厳しくなっている．この排出ガス減少対策には，ターボシステムやフィルタを使ったものがあり，ターボシステムには，機械式と電動式があげられる．機械式は，排出ガスを利用するため応答性の問題があるが，電動式は応答性が良くエンジンの性能向上に期待がもてる．本稿では，電動式を用いてディーゼルエンジンの黒煙減少システムの提案について述べると共に，電動タービンによる過給を行い黒煙の減少を確認したので報告する．
172.	秦健太郎, Kenji Yamanaka and Masahide Hojo : 摩擦ブレーキを用いた電動機負荷試験装置の特性試験, Proceedings of the Japan Industry Applications Society Conference, Y-132, Aug. 2013. (Summary) ハイブリッド車といった電気自動車などには小型軽量，高効率である永久磁石同期電動機が使われており，出力は数十kW，トルクは数百Nmを発生する物が多い．この電動機試験をM-Gsetの構成とすると，大きなサーボシステムが必要となることから摩擦ブレーキを用いた負荷試験装置の試作を検討した．しかし高トルク対応の摩擦ブレーキユニットの入手性に問題があり，本研究室では比較的安価な自動車部品を用い，負荷試験装置の試作，運転試験等を進めてきた(1)．本稿では，負荷試験装置の構成について述べると共に，これを用いてハイブリッド車に用いられている電動機ユニットの負荷試験結果から，負荷試験装置のブレーキ特性を確認したので報告する．
173.	Kouhei Ohkusa and Masahide Hojo : 太陽光発電システム導入時の低圧配電系統の電圧制御の基礎検討, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, 69-70, Aug. 2013. (Summary) 我が国では，一般住宅や建築物において太陽光発電システムの普及が始まっている．太陽光発電システムの普及が進むと，太陽光発電システムの出力からの逆潮流により電圧上昇が生じ配電系統の電圧調整が困難になると懸念されている．家庭用などの小容量の太陽光発電システムは一般に低圧配電系統に連系されるが，この場合，高圧配電系統に問題が生じていなくても柱上変圧器以下の低圧配電系統で適正電圧範囲からの逸脱や電圧不平衡が生じる可能性がある．そこで，単相3線式の低圧配電系統についてシミュレーションにより電圧変動を解析し，系統連系インバータの無効電力制御により低圧配電系統の調整を行う方法について述べる．
174.	Junnya Yokoyama and Masahide Hojo : 需要家端における電圧位相計測による電力系統の状態観測の有効性の基礎検討, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Aug. 2013. (Summary) 従来，広域的で大規模なシステムである電力系統の動特性を把握することは困難であった．これに対し，近年ではGPSの時刻信号を利用して複数の離れた地点の電圧をフェーザ量として同期計測することが可能な技術が実用化されている．しかし，系統の詳細な構成が不明であり，多数の分散電源が導入されるなど，系統構成が目まぐるしく変化する状況下での計測結果の信頼性に疑問が残されていた．本研究では，配電系統の種々の条件下においても需要家端に設置した位相計測が有効に機能しうるかどうか検討することを目的とした．配電系統において想定される条件下でシミュレーションを行い，配電線の送出電圧と末端電圧の位相差と周波数偏差の計測結果が受ける影響を評価した．
175.	小泉僚平, Yuji Mishima, 三栗祐己 and Masahide Hojo : 路面電車用電力線を利用した太陽光発電の直流連系変換器の最適配置 -変換器の容量制約を考慮した検討-, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Aug. 2013. (Summary) 市街地に張り巡らされている路面電車は，直流電力で運転している．そのため，太陽光発電(PV)の直流電力が連系変換器(DC/DCコンバータ)を介して路面電車の電力線に送電することが可能であれば，高価なDC/AC変換器(パワーコンディショナー)の設置が不要となり，PVの普及を促進できる．著者らはこれまで，PVが路面電車沿線の学校，住宅，商業施設等に導入される将来の状況を想定した場合の，連系変換器の最適配置を決定する基礎的な手法を提案してきた．本稿では，その手法をベースとし，さらに連系変換器の容量制約を設けた場合の最適配置を試算する．
176.	Tomoya Nishioka and Masahide Hojo : 直流給電システムにおける多端子受電回路の特性評価, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Aug. 2013.
177.	Yuji Ohfuchi and Masahide Hojo : 大容量太陽光発電システムによる配電線電圧の適正化., Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Aug. 2013. (Summary) 大容量PVが配電系統に連系された場合，その系統連系インバータを用いて無効電力制御を行うことで効果的な電圧制御を実現できる可能性がある．本研究では9つのノードの配電系統モデルを例にとり，全てのノードに小容量PVが連系され，一箇所に大容量PVが連系されている．ただし，小容量PVは力率1運転を行い，大容量PVのみで無効電力制御を適用する．制御ゲインの適正化を行い，大容量PVの適正運用について検討してきたが，無効電力による損失が大きくなることが以前までに判明した．そのため，本稿では小容量PVの制御との連携を考慮した上で，大容量PV導入に適した無効電力制御を検討した結果を示す．
178.	Tomoya Masuda and Masahide Hojo : 変電所タップ変更を考慮した太陽光発電システムの準集中無効電力制御, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Aug. 2013. (Summary) 太陽光発電システムが多数台連系される際に，配電線電圧の上昇が懸念されている．この電圧上昇の対策の一つとして，太陽光発電システムの系統連系インバータの無効電力制御を行う方法が挙げられる．これまで著者らは無効電力制御における電圧制御方式として，自端・集中制御方式だけではなく，新たに後続制御方式を提案し，検討を行ってきた．しかし，コントロールセンタの設置数増加に伴い，設置場所の確保が困難であることが考えられる．本稿では，提案していた後続制御方式を新たに改良し，さらには無効電力制御中の変電所タップ変更との連携について検討したので報告する．
179.	Hidekadu Takeda and Masahide Hojo : 電圧制御における有効/ 無効電力の制御効果の比較検討, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Aug. 2013. (Summary) 太陽光発電などの分散型電源の多数台導入により，受電端電圧が電気事業法で定められた適正電圧範囲を超える，いわゆる電圧逸脱が生じる恐れが指摘されている．筆者らは，系統連系インバータの無効電力制御に加えて，蓄電池の有効電力制御を併用することで電圧逸脱を防止する方法を検討している．同じ電圧制御幅に対し，有効電力制御と無効電力制御では注入または吸収するp.u.値，つまり系統基準容量に対する割合が異なる．本稿では，同じ電圧制御幅に対し，両制御法において必要となるp.u.値を比較し，その相対的価値を検討した結果について述べる．
180.	Tomoya Nishioka and Masahide Hojo : A Circuit Topology with Multiple Receiving Ends in a DC Power Supply System, National Convention Record I.E.E. Japan, Mar. 2013.
181.	Yuji Ohfuchi and Masahide Hojo : Voltage Control in Distribution System by Utility Interactive Inverters for a High Power Photovoltaic Generation System, National Convention Record I.E.E. Japan, Mar. 2013.
182.	Hidekadu Takeda and Masahide Hojo : Regulated Reactive Power Control of Utility Interactive Inverters for Photovoltaic Generation Systems with Battery Units, National Convention Record I.E.E. Japan, Mar. 2013.
183.	Tomoya Masuda and Masahide Hojo : Consideration of Semi-centralized Control Systems in Reactive Power Control, National Convention Record I.E.E. Japan, Mar. 2013.
184.	Hidekadu Takeda and Masahide Hojo : Effects of Power Factor Change on Voltage Rise Suppression by Active and Reactive Power Control, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.2, 58, Sep. 2012.
185.	Yuji Ohfuchi and Masahide Hojo : Control sensitivity of Reactive Power Control for Distribution Line Voltages with a High Power Photovoltaic Generation System, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.3, 59, Sep. 2012.
186.	Tomoya Nishioka and Masahide Hojo : A Power Supply for Solid-state Lighting in a DC Power Supply Network, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.7, 63, Sep. 2012.
187.	Tomoya Masuda and Masahide Hojo : Reactive Power Control Coordinating Various Types of Utility Interactive Inverters C onsidering Load Conditions, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.1, 57, Sep. 2012.
188.	Kousuke Sakurai and Masahide Hojo : Fault Ride-through Ability of Wind Power System by Doubly-Fed Induction Generator, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.4, 60, Sep. 2012.
189.	Ryo Ikeshita, Masahide Hojo, Yoshinobu Ueda and Toshihisa Funabashi : Reactive Power Control with a Converter Emulating Synchronous Machine, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.5, 61, Sep. 2012.
190.	Ippei Usuzumi and Masahide Hojo : Voltage Imbalance of a Three-phase Inverter with Integrated DC Power Supply, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.6, 62, Sep. 2012.
191.	Ippei Usuzumi and Masahide Hojo : Integrated Power Converter with Various DC Voltage Sources, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, No.196, Sep. 2012. (Summary) 近年，太陽電池や蓄電池のような，動作電圧の異なる直流によるエネルギー源が身近になってきている．これらを利用する際には複数の電力変換器が必要であるが，それらを一つに集約化すれば，変換段数の削減によって損失を抑えることができ，また非常時にも複数種の電源を簡便に利用できるようになることが期待できる．<br>そこで，筆者らは，構造的に複数の直流電圧端子を持つフライングキャパシタ形マルチレベルコンバータ方式に注目し，これを応用した集約型電力変換器についてシミュレーションによる検討を行ってきた．本稿では，今回は提案回路に太陽電池のMPPT制御(最大電力点追従制御)を装備した場合の制御効果とエネルギーフローについて検討した結果について述べる．
192.	Ryo Ikeshita, Masahide Hojo, Yoshinobu Ueda and Toshihisa Funabashi : Effectiveness of Multiple Self-Commutated Power Converters Emulating Synchronous Machines, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, No.228, Sep. 2012. (Summary) 半導体電力変換器が電力系統に多数台連系されることに伴う同期化力の低下が懸念されている．一方，自励式変換器に対して従来の同期発電機のような挙動を付加する，いわゆるVirtual Synchronous Machine といった考え方が提案され，同期化力の低下を防ぐ一つの方法として注目されている．これまでに，複数台の変換器間でも協調した制御が可能であることを明らかにしてきた．しかしながら，複数台変換器の制御効果については，それらの初期条件の差に大きく依存すると考えられるものの，これまでの研究では考慮していなかった．本稿ではこうした初期条件，さらには変換器容量の異なる条件下での制御法とその効果について検討を行うと共に，必要とされる変換器容量について評価を行う．
193.	Kosuke Sakurai and Masahide Hojo : Fault Ride Through of Wind Turbine Considering Its Inertia, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, No.340, Sep. 2012. (Summary) 半導体電力変換器が電力系統に多数台連系されることに伴う同期化力の低下が懸念されている．一方，自励式変換器に対して従来の同期発電機のような挙動を付加する，いわゆるVirtual Synchronous Machine といった考え方が提案され，同期化力の低下を防ぐ一つの方法として注目されている．これまでに，複数台の変換器間でも協調した制御が可能であることを明らかにしてきた．しかしながら，複数台変換器の制御効果については，それらの初期条件の差に大きく依存すると考えられるものの，これまでの研究では考慮していなかった．本稿ではこうした初期条件，さらには変換器容量の異なる条件下での制御法とその効果について検討を行うと共に，必要とされる変換器容量について評価を行う．
194.	Hidekadu Takeda and Masahide Hojo : Voltage Rise Suppression by Active Power Control of Batteries, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, No.P29, Sep. 2012. (Summary) 太陽光発電システムの多数台導入が期待されているが，一方で，配電線における電圧変動に伴い，受電端電圧が適正電圧範囲を超える，いわゆる電圧逸脱が生じる恐れが指摘されている．本稿では，太陽光発電システムの系統連系インバータの空き容量を利用した無効電力制御に加えて，蓄電池の有効電力制御制御を併用することで，電圧逸脱を防止する方法をシミュレーションにより検討したものである．家庭用蓄電池の充電電力は太陽電池出力の10%としたとき，多数台導入時にも，柱上変圧器の二次側力率を下げることなく，適正電圧維持が可能なことを確かめた．さらに導入量が増えた場合でも，大容量の蓄電池を系統側に設置することで対応可能な方法を考案した．本稿では，その検討結果を報告する．
195.	Yuji Ohfuchi and Masahide Hojo : Rective Power Control for Distribution Line Voltages with a High Power Photovoltaic Generation System, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, No.P32, Sep. 2012. (Summary) 本研究では，大規模の太陽光発電が配電系統の1箇所に集中的に連系された場合の電圧変動抑制を目的とした制御について検討を行った．モデルは9ノードの配電系統を例にとり，その1つだけに大容量の太陽光発電システムが連系されたときの無効電力制御とその効果を考える．集中制御と自端制御をそれぞれ行い，大容量の太陽光発電システムの連系時にどちらのの制御方式が適しているか，また配電系統のどの部分に連係された場合の制御効果が高いかについて検討した．結果として，全体を制御する集中制御方式よりも自身のみを制御する自端制御方式が電圧変動の抑制が容易で，コストも安いため適していることがわかった．また，大容量の太陽光発電システムの設置場所が選べる場合には始端に連系する場合が電圧上昇が少なく，適していることがわかった．
196.	Tomoya Nishioka and Masahide Hojo : A Method of Multiple Receiving Ends for an Offshore Wind Power DC Transmission System, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, No.P27, Sep. 2012. (Summary) 洋上風力発電による発電電力の送電には自励式変換器による直流送電の応用が期待されている．これに対し，先に提案されている High Voltage DC Tap という回路方式を適用すれば，その直流送電線に小容量の受電端を複数設けることができるようになる．まず，筆者らは小容量副受電回路のスイッチング周波数とデューティ比の関係において，ZVS(Zero Voltage Switching)可能領域を明らかにした．さらに，副受電回路を2つとし，直流送電線上の電流脈動を抑制する方法を考案した．本稿では，回路シミュレーションに基づく検証結果とともに，提案方式の有用性について詳述する．
197.	Tomoya Masuda and Masahide Hojo : Reactive Power Control Coordinating Various Types of Utility Interactive Inverters, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, No.P31, Sep. 2012. (Summary) 近年，配電線電圧上昇抑制に寄与する太陽光発電システムの系統連系インバータ制御について，種々の方式が検討されている．しかし，一方で既に太陽光発電システムの導入は進んできている．本研究は，新旧種々の系統連系インバータが混在する場合において，無効電力制御の相互協調による配電線電圧制御が正しく機能するかどうか検証を行ったものである．なかでも，受電点電圧検出に基づく無効電力制御方式について，各インバータが自端情報に基づき制御を行う自端制御方式と，通信線を共有した集中制御方式において，新旧インバータ混在状況の影響について検討を行った結果について述べる．
198.	Ippei Usuzumi and Masahide Hojo : Integrated Power Converter with Solar Cells and a Battery, National Convention Record I.E.E. Japan, Mar. 2012. (Summary) 近年，太陽電池や蓄電池のような，動作電圧の異なる直流によるエネルギー源が身近になってきている．これらを利用する際には複数の電力変換器が必要であるが，それらを一つに集約化すれば，変換段数の削減によって損失を抑えることができ，また非常時にも複数種の電源を簡便に利用できるようになることが期待できる．そこで，筆者らは，構造的に複数の直流電圧端子を持つフライングキャパシタ形マルチレベルコンバータ方式に注目し，これを応用した集約型電力変換器についてシミュレーションによる検討を行ってきた．本稿では，今回は提案回路に太陽電池の簡易型のMPPT制御(最大電力点追従制御)を加えた場合の検討結果について述べる．
199.	Kousuke Sakurai and Masahide Hojo : Mitigation of Rotational Speed Change of Wind Turbine with Modified Inertia, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.14, 66, Sep. 2011.
200.	Ryo Ikeshita, Masahide Hojo, Yoshinobu Ueda and Toshihisa Funabashi : Operation of Multiple Inverters as Virtual Synchronous Machines in Microgrid, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.13, 65, Sep. 2011.
201.	Taiki Araoka and Masahide Hojo : Investigation of an Autonomous Control Method of Uninterruptible Power Supplies in a Microgrid, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.12, 64, Sep. 2011.
202.	Ippei Usuzumi and Masahide Hojo : A Basic Study on Integrated Power Converter with Multiple Dc Voltage Sources, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.11, 63, Sep. 2011.
203.	Hirofumi Fukuda and Masahide Hojo : Active Power Control of Three-Phase Inverter in Accordance with Variations of Power System Frequency, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.10, 62, Sep. 2011.
204.	Satoru Taki and Masahide Hojo : Relation between an Appropriate Voltage Range and a Voltage Imbalance in a Distribution System, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.9, 61, Sep. 2011.
205.	Tomohiro Arita and Masahide Hojo : Voltage control of a distribution line by photovoltaic generation s ystems and a series reactor, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.8, 60, Sep. 2011.
206.	Kosuke Sakurai and Masahide Hojo : Suppression of rotational speed variation of wind turbine using inertia of wind mill, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.54, Sep. 2011.
207.	Ryo Ikeshita, Masahide Hojo, Yoshinobu Ueda and Toshihisa Funabashi : Study on the transient stability of a microgrid with the virtual synchronous machine, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.47, Sep. 2011.
208.	Taiki Araoka and Masahide Hojo : An Autonomous Control Method of Uninterruptible Power Supplies in a Microgrid, National Convention Record I.E.E. Japan, Mar. 2011.
209.	Taiki Araoka and Masahide Hojo : マイクログリッドにおける複数台の無停電電源装置用インバータ制御法, 平成22年電気関係学会関西連合大会講演論文集, Nov. 2010.
210.	Tomohiro Arita and Masahide Hojo : 配電線電圧制御のための通信を介した太陽光発電システムによる無効電力制御の模擬実験, 平成22年電気関係学会関西連合大会講演論文集, Nov. 2010.
211.	Yuji Mishima and Masahide Hojo : 路面電車を利用した太陽光発電導入拡大方策の提案, 平成22年度電気・情報関係学会北海道支部連合大会講演論文集, Oct. 2010.
212.	Shinnichi Yamano and Masahide Hojo : Study on Fault Ride-Through of Photovoltaic Generation Systems by a Series-Connected Inverter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.8, 34, Sep. 2010.
213.	Hirofumi Fukuda and Masahide Hojo : Active Power Control of Three-Phase Inverter in Accordance with Variations of Power System Frequency, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.7, 33, Sep. 2010.
214.	Satoru Taki and Masahide Hojo : A Compensation Method of Unbalanced Loads by Plural Single-Phase Inverters in an Islanding Microgrid, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.6, 32, Sep. 2010.
215.	Megumi Emoto, Masahide Hojo, Yasunori Mitani, Hiroyuki Ukai and Osamu Saeki : Distinction of Characteristics in Power System Disturbances by Voltage Measurements at Customers, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.4, 30, Sep. 2010.
216.	Takeaki Terauchi, Masahide Hojo, Yoshinobu Ueda and Toshihisa Funabashi : Load Sharing between Synchronous Generator and Virtual Synchronous Machine in Microgrid, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.15, 52, Sep. 2010.
217.	Yuki Fukuoka, Masahide Hojo and Toshihisa Funabashi : Power Factor Correction of a Single-Phase Fault Current Limiter Based on Voltage Sourced Inverter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.14, 51, Sep. 2010.
218.	Tomohiro Arita, Masahide Hojo and Naoki Kobayashi : Experimental Studies on Reactive Power Control of Photovoltaic Generation System for Distribution Line Voltage Control, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.II, No.198, Sep. 2010. (Summary) 太陽光発電システムが多く導入されると出力変動などによる配電線の電圧変動が懸念される．本研究では，太陽光発電システムの系統連系インバータの無効電力制御を積極的に行い，配電系統の電圧制御に寄与する方法に着目した．これにより，配電系統の電圧変動抑制のために太陽光発電システムの出力抑制や解列の必要が少なくなることが期待される．そこで，模擬実験装置を構築し，外部からのディジタル信号に従って，連系インバータ制御系内部の適正電圧範囲設定値をリアルタイムで変更できるようにした．電圧が適正範囲から逸脱した状態を模擬し，系統連系インバータの無効電力制御を投入すると，電圧逸脱を解消できることを確認した．
219.	Yuki Fukuoka, Masahide Hojo and Toshihisa Funabashi : D.C. Voltage Rise Restriction of Fault Current Limiter by a Series-Connected Inverter with a Shunt-Connected Diode Rectifier, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.II, No.317, Sep. 2010. (Summary) 近年，電力系統に短絡故障などが発生した場合の故障電流の増大が懸念されている．そこで本研究では，変圧器を介して系統に直列に接続された電圧形インバータと限流リアクトル，および並列に接続されたダイオード整流器から構成される限流器を提案する．限流器に求められる特性として，平常時には電力系統の安定かつ効率的な運用を妨げないようにインピーダンスはできるだけ小さく，一方で故障発生時には限流効果を持つような等価インピーダンスを瞬時に発生することが要求される．ただし，これまでの検討では，3線地絡故障時にインバータの直流電圧が上昇する問題があった．そこで，本論文では，ゼロ電圧ベクトル制御の適用し，これによって直流電圧の上昇を抑えることを提案する．
220.	Megumi Emoto, Masahide Hojo, Yasunori Mitani, Hiroyuki Ukai and Osamu Saeki : Observation of Power System Disturbances by Campus WAMS, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.P, No.32, Sep. 2010. (Summary) フェーザ計測ユニット(Phasor Measurement Unit: PMU)は，GPSの時刻信号に同期して，互いに離れた複数地点の100Vコンセントの電圧フェーザ量の同期計測が可能である．著者らは，西日本60Hz系統の8大学に設置したPMUによる多地点同期位相計測システム(Campus Wide Area Measurement System: CampusWAMS)を構成している．これまでに，計測結果を周波数偏差位相差平面に表示したとき，系統に生じた外乱に対応してその計測点分布が特徴を示すことがわかってきた．本稿では，PMUを用いた計測結果のなかで電源解列時と計測地周辺で停電があった時を例に取り，その状態観測結果の特徴について述べる．
221.	Hirofumi Fukuda and Masahide Hojo : Active Power Control of Three-Phase Inverter in Accordance with Frequency Variations, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.P, No.43, Sep. 2010. (Summary) 電力系統においては，適切な発電量制御によって周波数維持が図られている．一方，分散形電源や蓄電設備など，インバータを介して有効電力の授受を行う新しい設備の系統連系が急速に進むことが予想されている．こうした周波数に対して反応しない電気エネルギー源の増加は，系統の周波数調整能力の低下に繋がることが懸念されている．そこで，本研究では周波数に応答する三相インバータによる有効電力抑制制御を提案することを目的としている．本稿では，一例として，系統の周波数低下に応じて負荷への電力供給を抑制する制御として負の周波数偏差に比例して蓄電設備の充電電力を抑制する制御を構築した．
222.	Taiki Araoka and Masahide Hojo : Inverter Control in Microgrid for Emergency Use, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.P, No.42, Sep. 2010. (Summary) 電力系統においては，適切な発電量制御によって周波数維持が図られている．一方，分散形電源や蓄電設備など，インバータを介して有効電力の授受を行う新しい設備の系統連系が急速に進むことが予想されている．こうした周波数に対して反応しない電気エネルギー源の増加は，系統の周波数調整能力の低下に繋がることが懸念されている．そこで，本研究では周波数に応答する三相インバータによる有効電力抑制制御を提案することを目的としている．本稿では，一例として，系統の周波数低下に応じて負荷への電力供給を抑制する制御として負の周波数偏差に比例して蓄電設備の充電電力を抑制する制御を構築した．
223.	Takeaki Terauchi, Masahide Hojo, Yoshinobu Ueda and Toshihisa Funabashi : Cooperative Control of Synchronous Generator and Multiple Inverter-Based Generators in Microgrid, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.P, No.40, Sep. 2010. (Summary) 近年，分散形電源関連技術の進歩に伴い，比較的小規模な電力ネットワークの自立運転に関する検討がなされてきている．しかし，系統から自立した場合には，電圧や周波数の維持を自立系統内で自らが行う必要がある．これを一定に制御する必要がある．また，マイクログリッド内に同期発電機を導入する場合，負荷変動により同期発電機の回転数に影響が出る可能性がある．本稿では，負荷変動に際しマイクログリッド内の同期発電機とインバータの負荷分担制御，電圧・周波数一定制御について検討した結果を述べる．
224.	Masahide Hojo : The Technical Trend in Practical Applications of DC Distribution System, National Convention Record I.E.E. Japan, Vol.6, No.S12-7, Mar. 2010.
225.	Masahide Hojo, Jumpei Baba, Akihiko Fukushi, Keiji Matsuda and Ryo Katsuki : The Trend in Electric Power System Supplying Transportation, National Convention Record I.E.E. Japan, Vol.4, No.S18-6, Mar. 2010.
226.	Takeaki Terauchi, Masahide Hojo, Toshihisa Funabashi and Yoshinobu Ueda : Load Sharing between Synchronous Generator and Multiple Inverter-Based Generators in Microgrid, National Convention Record I.E.E. Japan, Vol.6, No.168, Mar. 2010.
227.	Yuki Fukuoka, Masahide Hojo and Toshihisa Funabashi : D.C. Voltage Control Method of Fault Current Limiter by a Series-Connected Inverter with a Shunt-Connected Diode Rectifier, National Convention Record I.E.E. Japan, Vol.6, No.151, Mar. 2010.
228.	Keiichi Abe, Masahide Hojo, Yasunori Mitani, Hiroyuki Ukai and Osamu Saeki : Examples of Power System Monitoring Under Typical Disturbances by Campus Wide Area Measurement System (CampusWAMS), Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.8, 38, Sep. 2009.
229.	Hidetoshi Hatano, Masahide Hojo and Naoki Kobayashi : A Study of Unified Control of Photovoltaic Generation Systems for Voltage Rise Suppression, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.9, 39, Sep. 2009.
230.	Takeaki Terauchi, Masahide Hojo, Yoshinobu Ueda and Toshihisa Funabashi : Cooperative Control of Synchronous Generator and Utility Interactive Inverter in Microgrid, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.7, 37, Sep. 2009.
231.	Takehito Watanabe and Masahide Hojo : Study on Fault Ride-Through by Series-Connected Inverter and Pitch Controller for Wind Power Generation System, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.6, 36, Sep. 2009.
232.	Yuki Fukuoka, Masahide Hojo and Toshihisa Funabashi : Single-Phase Application of a Fault Current Limiter by Voltage Source Inverter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.1, 31, Sep. 2009.
233.	Hidetoshi Hatano, Masahide Hojo, Naoki Kobayashi and Yoshiaki Fuwa : Suppression of Voltage Variation of Distribution Line by Unified Control of Many Photovoltaic Generation Systems, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.P, No.20, 39-40, Aug. 2009. (Summary) 近年，太陽光発電が注目されており電力系統への導入が進んでいるが，太陽光発電の出力変動や逆潮流などによる配電線電圧の変動を抑制しきれない可能性がある．電力品質を保つために，太陽光発電の有効出力を抑えることで電圧変動を抑制する方法があるが，システム効率が下がってしまう．別の対策として，太陽光発電システムの系統連系インバータを利用し，インバータの容量内で無効電力制御を行う方法があるが，多数のインバータを個別に制御する方法ではノードごとの制御量に偏りが生じる可能性がある．そこで本研究では自端情報を主とした無効電力制御について，偏りを是正した方式の検討を行った．
234.	Takehito Watanabe and Masahide Hojo : Fault Ride-Through of Wind Power Generation System by Reactive Power Control with Series-Connected Inverter, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.P, No.18, 35-36, Aug. 2009. (Summary) 電力系統に連系された風力発電システムにおいて，系統側に瞬時電圧低下が生じたような場合，風車の回転速度が変動することを防ぐため，風力発電システムは電力系統から解列される．ところが，大容量の風力発電システムの不要な解列は却って系統に擾乱を与える恐れがある．そのため，風力発電システムの運転継続(Fault Ride-Through, FRT)能力に関して様々な検討がなされている．著者らは電力系統と風力発電システムの間に変圧器を介して直列インバータを接続し，瞬時電圧低下補償を行う方式を提案し，FRTに関する検討を行った．
235.	Takeaki Terauchi, Masahide Hojo, Yoshinobu Ueda and Toshihisa Funabashi : Control Method of Utility Interactive Inverter for Energy Storage Device in Microgrid, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.P, No.17, 33-34, Aug. 2009. (Summary) 近年，電力を必要とする場所の近くに小型発電設備を設置し発電する試みが全国で活発化しているため，マイクログリッドの研究が多くの研究機関で行われている．本研究では，鉛蓄電池を模擬したインバータモデルを作成し，電力系統と連系運転から，自立運転に移行後，蓄電池の残存容量を検出しつつ，残存容量が規定値に達したら再連系運転を行うシミュレーション解析によって動作検証を行った．その上で再連系の際に連系点電圧との位相同期を行う方法の検討を行った．以上の検討により，マイクログリッド内における電力貯蔵装置の動作，再連系運転の際も円滑な運用が可能なことを検討した．
236.	Keiichi Abe, Masahide Hojo, Yasunori Mitani, Hiroyuki Ukai and Osamu Saeki : Online Power System Monitoring by Multiple Synchronized Phasor Measurements, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.P, No.14, 27-28, Aug. 2009. (Summary) 近年，電力系統全体の動特性を把握することが重要となってきている．本研究はフェーザ計測ユニットを利用し，電力系統の状態観測法を検討したものである．まず，位相差-周波数偏差平面に計測値をプロットし，データを更新していくような手法を提案する．また，同平面上に電力系統の標準的な状態を示す窓枠を定義した．そして，平面上にデータをプロットし，更新すると，定常時にはデータの分布は窓枠内で変化したのに対し，電源脱落時にはデータの分布は定常時から電源が脱落したと同時に窓枠の外に出た．以上の結果から，提案する手法を用いる有効性を確認した．
237.	Yuki Fukuoka, Masahide Hojo, Toshihisa Funabashi and Ghanim Putrus : Fault Current Limiter by a Series Connected Inverter with a Shunt Connected Diode Rectifier, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.P, No.13, 25-26, Aug. 2009. (Summary) 近年，電力系統に短絡故障などが発生した場合の故障電流の増大が懸念されている．そこで本研究では，変圧器を介して系統に直列に接続された電圧形インバータと限流リアクトル，および並列に接続されたダイオード整流器から構成される限流器を提案する．限流器に求められる特性として，平常時には電力系統の安定かつ効率的な運用を妨げないようにインピーダンスはできるだけ小さく，一方で故障発生時には限流効果を持つような等価インピーダンスを瞬時に発生することが要求される．提案方式では，直列インバータによって電源ラインのインピーダンス制御を行う方式の限流器を検討した．
238.	Kazuyuki Minato and Masahide Hojo : Operating Characteristics of a DC Power Network by a Flying Capacitor Multilevel Converter, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.P, No.10, 19-20, Aug. 2009. (Summary) 近年，分散型電源やその出力平滑化のための蓄電装置を含むシステムの研究が進められているが，これらの多くは直流であり，既存の系統と連系する際には電力変換装置が多用されることになる．他方，直流給配電システムの可能性が注目・検討されている．筆者らは，直流給配電システムに特化した変換回路として，複数レベルの直流電圧を供給可能なフライングキャパシタ形マルチレベルコンバータに注目し，給配電システムの可能性を検討している．
239.	Kazuyuki Minato and Masahide Hojo : A Study on a DC Power Network Using Flying Capacitor Multilevel Converter, National Convention Record I.E.E. Japan, Vol.6, No.268, 434, Mar. 2009.
240.	Takehito Watanabe and Masahide Hojo : A Study on Fault Ride-Through of Wind Power Generation System with Series-Connected Inverter and Pitch Controller, National Convention Record I.E.E. Japan, Vol.6, No.275, 445, Mar. 2009.
241.	Hidetoshi Hatano, Masahide Hojo, Naoki Kobayashi and Yoshiaki Fuwa : Effect of Output Power Variations on Reactive Power Control of Photovoltaic Generation Systems, National Convention Record I.E.E. Japan, Vol.6, No.277, 448, Mar. 2009.
242.	Masahide Hojo : 太陽光発電システムの系統連系インバータによる系統電圧ひずみの補償, Dec. 2008.
243.	Hidetoshi Hatano, Masahide Hojo and Yoshiaki Fuwa : Voltage Rise Suppression by Reactive Power Control of Photovoltaic Generation Systems with Sampled Data, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.8, Sep. 2008.
244.	Kazuyuki Minato and Masahide Hojo : A Basic Study on a Converter for AC and DC Supply in Islanded Power System Using Flying Capacitor Multilevel Inverter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.14, Sep. 2008.
245.	Takehito Watanabe and Masahide Hojo : Voltage Compensation Method by Series-Connected Inverter and Pitch Controller for Low-Voltage Ride-Through of Wind Power Generation System, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.13, Sep. 2008.
246.	Yuta Iwase, Masahide Hojo, Yoshinobu Ueda and Toshihisa Funabashi : A Study on Compensation Method of Unbalanced Three-Phase According to Inverter Capacity, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.12, Sep. 2008.
247.	Kota Amo, Masahide Hojo, Yoshinobu Ueda and Toshihisa Funabashi : A Control Method of Uninterruptible Power Supply in a Microgrid for No-Load Condition, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.11, Sep. 2008.
248.	Shigekazu Sakai, Yasuhiro Hayashi, Shoji Kawasaki, Junya Matsuki, Jumpei Baba, Akihiko Yokoyama, Masahide Hojo, Shinji Wakao, Kenjiro Mori and Yoshiaki Fuwa : Experiment of Active Coordinated Operation of Distributed Generators and Distribution Network by ANSWER, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, No.P22, Sep. 2008. (Summary) 近年，自然エネルギーを利用した分散型電源と配電ネットワークとが協調して，安定かつ確実に電力を供給するという新しい概念に基づいた電力供給システムの検討が，国内外で行われている．著者らは，分散型電源と配電ネットワークとの協調運用の実現を目指し，協調運用形態の提案と協調運用を行うためのシミュレーション手法の開発を行ってきた．また，シミュレーション手法の妥当性を検証するための分散型電源連系課題解決支援実験システム(ANSWER)の構築を行った．本稿では，構築した実験設備を用いて，送出し電圧の決定，開閉器制御による
249.	Hidetoshi Hatano, Masahide Hojo and Yoshiaki Fuwa : Voltage Rise Suppression by Reactive Power Control of Photovoltaic Generation Systems based on Autonomous Control, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, No.P27, Sep. 2008. (Summary) 近年，太陽光発電が注目されており電力系統への導入が進んでいるが，太陽光発電の出力変動や逆潮流などによる配電線電圧の変動を抑制しきれない可能性がある．電力品質を保つために，太陽光発電の有効出力を抑えることで電圧変動を抑制する方法があるが，システム効率が下がってしまう．別の対策として，太陽光発電システムの系統連系インバータにおいて，インバータの容量内で無効電力制御を行うことで配電線電圧の変動を抑制する方法があるが，ノードごとの制御量に偏りが生じる可能性がある．そこで本研究では自端情報を主として無効電力制御を行った結果について述べる．
250.	Takehito Watanabe and Masahide Hojo : Voltage Compensation Method by Series-Connected Inverter for Low-Voltage Ride-Through of Wind Power Generation System, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, No.P12, Sep. 2008. (Summary) 近年導入が増加している風力発電システムであるが，系統側電圧の低下によって不用意に解列される可能性が指摘され，これに伴う問題が指摘されはじめている．一方，線路電圧を高速かつ直接的に制御可能なパワーエレクトロニクス機器として直列接続方式の電圧形インバータが提案されている．そこで，本研究では直列インバータを風力発電システムに接続し，系統電圧の低下時にこれを補償して，風力発電システムが不用意に解列されないようにする方式を提案する．本稿では，シミュレーション解析によってこの動作を検証している．
251.	Yuta Iwase, Masahide Hojo, Yoshinobu Ueda and Toshihisa Funabashi : A Study on Compensation Method of Unbalanced Three-Phase by Multiple Photovoltaic Generation Systems in a Microgrid, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, No.P37, Sep. 2008. (Summary) 近年，分散型電源やその出力平滑化のための蓄電装置を含むシステムの研究が進められているが，これらの多くは直流であり，既存の系統と連系する際には電力変換装置が多用されることになる．他方，直流給配電システムの可能性が注目・検討されている．筆者らは，直流給配電システムに特化した変換回路として，複数レベルの直流電圧を供給可能なフライングキャパシタ形マルチレベルコンバータに注目し，給配電システムの可能性を検討している．
252.	Kota Amo, Masahide Hojo, Yoshinobu Ueda and Toshihisa Funabashi : Study on Parallel Operation of Inverters in an Islanded Microgrid, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, No.P38, Sep. 2008. (Summary) 近年，分散型電源やその出力平滑化のための蓄電装置を含むシステムの研究が進められているが，これらの多くは直流であり，既存の系統と連系する際には電力変換装置が多用されることになる．他方，直流給配電システムの可能性が注目・検討されている．筆者らは，直流給配電システムに特化した変換回路として，複数レベルの直流電圧を供給可能なフライングキャパシタ形マルチレベルコンバータに注目し，給配電システムの可能性を検討している．
253.	Kazuyuki Minato and Masahide Hojo : A Basic Study on DC Power Supply System by Flying Capacitor Multilevel Inverter, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.13, Aug. 2008.
254.	Masahide Hojo and Yasuhiro Hayashi : Experimental Studies on Harmonics Suppression by Utility Interactive Inverters of Distributed Generators, National Convention Record I.E.E. Japan, Vol.6, No.254, 428, Mar. 2008.
255.	Yasuhiro Hayashi, Shoji Kawasaki, Junya Matsuki, Shigekazu Sakai, Jumpei Baba, Akihiko Yokoyama, Masahide Hojo, Shinji Wakao, Yoshiaki Fuwa and Kenjiro Mori : Development of Distribution Network Equipment (ANSWER) to Support the Solution of Problem of Connecting Distributed Generators, National Convention Record I.E.E. Japan, Vol.6, No.258, 435-436, Mar. 2008.
256.	Takuhei Hashiguchi, Noriyuki Sato, Tadahiro Goda, Yasunori Mitani, Masayuki Watanabe, Osamu Saeki, Masahide Hojo and Hiroyuki Ukai : Construction Method for Center of Inertia by Using Multiple Synchronized Phasor Measurement Data, National Convention Record I.E.E. Japan, Vol.6, No.021, 37-38, Mar. 2008.
257.	Kota Amo, Masahide Hojo, Yoshinobu Ueda and Toshihisa Funabashi : A Control Method of Uninterruptible Power Supply in a Microgrid, National Convention Record I.E.E. Japan, Vol.6, No.216, 360, Mar. 2008.
258.	Yuta Iwase, Masahide Hojo, Yoshinobu Ueda and Toshihisa Funabashi : A Study on Compensation Method of Voltage Imbalance by Utility Interactive Inverter, National Convention Record I.E.E. Japan, Vol.6, No.215, 359, Mar. 2008.
259.	Naoji Yamada, Tokuo Ohnishi and Masahide Hojo : Active Filter Operation of Sinusoidal Voltage Interconnecting Three-Phase Inverter with Current Control Loop, National Convention Record I.E.E. Japan, Vol.4, No.169, 283, Mar. 2008.
260.	Naoji Yamada, Tokuo Ohnishi and Masahide Hojo : Current Controlled Type Sinusoidal Voltage Interconnecting Single Phase Inverter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.4, 40, Sep. 2007.
261.	Yuta Iwase and Masahide Hojo : A Study of Compensation Method of Unbalanced Currents by Photovoltaic Generation Systems due to Load Change, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.3, 39, Sep. 2007.
262.	Kota Amo, Masahide Hojo and Toshihisa Funabashi : Load-Following Operation of Small Power Network by a Supporting Apparatus, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.2, 38, Sep. 2007.
263.	Yuki Fujimura, Masahide Hojo, Tokuo Ohnishi and Toshihisa Funabashi : Fault Current Limiter Control Using Voltage Source Inverter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.1, 37, Sep. 2007.
264.	Akira Izume, Masahide Hojo and Yoshiaki Fuwa : A Study for Control of Distribution Line Voltage by Photovoltaic Generation Systems and Tap of Transformer, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.3, No.6, 31, Sep. 2007.
265.	Yuta Iwase, Masahide Hojo and Tokuo Ohnishi : Basic Study on A Compensation Method of Unbalanced Voltage of Photovoltaic Generation Systems, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.53, No.429, 11-12, Sep. 2007. (Summary) 太陽光発電システムが多数台連系された場合に，電圧・電流の不平衡が懸念されている．不平衡が起こると，正相分に加えて逆相分，零相分が発生する．これらは，三相誘導機が接続された交流系統においては誘導機の出力トルクの低下，相配電線では電力損失の増加や電圧低下などの原因となる．対策としては，SVCやアクティブフィルタなどのパワーエレクトロニクス機器(パワエレ機器)に不平衡補償機能を付加して補償することが考えられている．本稿では，不平衡補償をパワエレ機器の増設によって行うのではなく，多数の連系インバータにで抑制する方法を検討したものである．
266.	Shigekazu Sakai, Yasuhiro Hayashi, Shoji Kawasaki, Junya Matsuki, Jumpei Baba, Akihiko Yokoyama, Masahide Hojo, Shinji Wakao, Naoki Kobayashi and Kohei Oishi : Verification Experiment of Active Coordinated Operation of Distributed Generators and Distribution Network, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.34, No.323, 15-16, Sep. 2007. (Summary) 近年，自然エネルギーを利用した分散型電源と配電ネットワークとが協調して，安定かつ確実に電力を供給するという新しい概念に基づいた電力供給システムの検討が，国内外で行われている．著者らは，分散型電源と配電ネットワークとの協調運用の実現を目指し，協調運用形態の提案と協調運用を行うためのシミュレーション手法の開発を行ってきた．また，シミュレーション手法の妥当性を検証するための配電ネットワーク模擬実験設備も構築した．本稿では，構築した実験設備を用いて，送出し電圧の決定，開閉器制御による系統構成の評価，分散型電源の連系可能最大出力の計測，風力発電機を連系させた場合の出力変動の平滑化を行ったので報告する．
267.	Akira Izume, Masahide Hojo, Tokuo Ohnishi, Shoji Taki, Kohei Oishi and Nobuyuki Fujiwara : Reactive Power Control of Photovoltaic Generation System by Detecting Distribution Line Voltages, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.53, No.431, 15-16, Sep. 2007. (Summary) 太陽光発電システムが多数台系統連系されることによる配電線電圧変動が懸念されている．その対策として，これらの太陽光発電システムを積極的に制御して電圧変動抑制を行う手法が提案されている．著者らは，これまで各太陽光発電システムが自端情報に基づいて無効電力制御を行うことによる電圧変動抑制の効果について検討を行ってきたが，太陽光発電システム間に無効電力制御量の格差が発生し，それが原因で電圧変動を抑制しきれないケースが存在することが分かった．それに対して本稿は，コントロールセンタにより配電線各点の情報に基づいた太陽光発電システムの一括制御を行い，その電圧変動抑制効果を検討したものである．
268.	Yuki Fujimura, Masahide Hojo, Tokuo Ohnishi and Toshihisa Funabashi : Basic Experiment of Fault Current Limiter by Voltage Source Inverter with Line Current Detection, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.42, No.367, 25-26, Sep. 2007. (Summary) 近年，電力系統の短絡容量増大に伴い，故障等によって引き起こされる短絡電流の抑制のための限流技術が注目されている．筆者らはこれまでに電圧形インバータ方式限流器(FCL)について模擬実験に基づく検討を行ってきた．そこで，本方式の限流器に適した電流検出方式に基づく制御系を新たに考案した．電圧形インバータは，ライン電流を検出し，待機時は限流リアクトルでの電圧降下補償，故障時には等価リアクタンス動作を行う．インバータの直流電圧は，PI制御によって位相補正を行うことにより実現している．本稿ではFCLのインバータ直流電圧一定制御の面から実験に基づく評価を行った結果について述べる．
269.	Kota Amo, Masahide Hojo and Tokuo Ohnishi : Study on An Apparatus to Support Independence of Small Power Network, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.30, No.293, 31-32, Sep. 2007. (Summary) 近年，分散型電源の普及に伴い，エネルギー貯蔵装置を組み合わせて管理・運用するローカルネットワーク型エネルギーシステムが注目されている．このシステムが大規模電力系統から自立して運用される場合には，自然エネルギーをエネルギー源の一部に利用するために，電力品質の問題が顕在化してくる．本研究では，常時は上位電力系統と分散型電源を含む小地域ローカル電力システムが協調しつつ電力の需給を行い，必要に応じてローカルシステム内を無停電のまま連系・自立・再連系という一連の動作が実現できる連系装置を開発し，自立可能なローカル電力システムを構築することを目的としている．この一連の動作をシミュレーションで検証を行った．
270.	Hirotaka Kikuya, Shoji Kawasaki, Yasuhiro Hayashi, Junya Matsuki and Masahide Hojo : Study on Optimal Allocation and Gain of Active Filter for Distribution Network with Distributed Generation Considering Network Configuration, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.51, No.406, 15-16, Sep. 2007. (Summary) 配電系統に設置されている開閉器の切り替えにより存在する膨大な数の系統構成候補の中から，配電損失を抑え，電力品質を維持するネットワーク構成を決定することが望ましい．また高調波対策として，アクティブフィルタを設置して高調波電圧を抑制しようとする研究が行われている．本稿では，実データに基づいて構築した分散型電源連系配電ネットワークの解析モデルを用いて，配電損失面および電圧不平衡率面から最良な系統構成候補を決定し，決定した系統構成候補にアクティブフィルタを設置した場合における，高調波の抑制効果についての検証を行い，設置箇所だけでなく，配電ネットワーク全体で最も高調波を抑制できるアクティブフィルタの設置箇所をおよびフィルタゲインを決定する方法について報告する．
271.	Kiyohiro Tsuboi, Yutaka Ota, Hiroyuki Ukai, Masayuki Watanabe, Yasunori Mitani, Masahide Hojo and Osamu Saeki : Campus WAMS based Power Oscillation Detection and Evaluation, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.19, No.225, 1-2, Sep. 2007. (Summary) 筆者らは大学構内の100VコンセントにPMUを設置し, 汎用サーバからなるPDCにデータを収集, 主に広域連系系統の電力動揺情報を抽出・評価するシステムを構築している．求められた電力動揺情報からは, 定常時の微小な電力動揺情報からの固有値推定, 外乱時の相対的に大きな電力動揺情報からの慣性定数同定, などの手法が提案されている．本論文ではこれらの手法について, システム実装を見据えた検討を行うとともに, これまでに実測されているデータに適用することで定常時外乱発生時一貫した電力動揺評価を行う
272.	Masayuki Watanabe, Takuhei Hashiguchi, Yasunori Mitani, Osamu Saeki, Masahide Hojo and Hiroyuki Ukai : Improvement of the Evaluation of the Wide Area Power System Stability Based on Multiple Synchronized Phasor Measurements with Observation Sites Changed, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.20, No.10, 19-24, Sep. 2007. (Summary) 近年，広域的なデータ収集に基づくリアルタイムの系統監視，制御技術が注目されてきており，著者らは，GPS時刻同期型位相計測装置を用いて系統全体の動特性を監視するシステムを構築してきた．これまでに定常時に観測される系統両端の位相差情報から系統の電力動揺モードを表す簡略モデルを構成して固有値を算出することで，広域安定度を推定できることがわかっている．本論文では，近接地点からの観測情報を用いた場合の推定精度への影響を調べ，精度を保証するために新たにFFTを利用したフィルタ処理による動揺抽出法を提案している．また，従来2地点データを必要としていた方法に対し1地点データからでも提案する処理法によって良好に抽出できることを示す．
273.	Naoji Yamada, Tokuo Ohnishi and Masahide Hojo : Sinusoidal Voltage Interconnecting Three-Phase Inverter with Current Control Loop to Compensate Load Terminal Voltage Distortion, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.126, 619-620, Aug. 2007.
274.	Tokuo Ohnishi, Katsuhisa Konishi and Masahide Hojo : Variable Speed Wind Power Generation System Using Induction Generator Controlled by Sensorless Inverter, National Convention Record I.E.E. Japan, Vol.7, No.023, 33, Mar. 2007.
275.	Masahide Hojo, Tokuo Ohnishi, Yasunori Mitani, Hiroyuki Ukai and Osamu Saeki : A Study on Phase Difference by Phasor Measurement with Consideration of Local Load Variation, National Convention Record I.E.E. Japan, Vol.6, No.204, 345, Mar. 2007.
276.	Akira Izume, Masahide Hojo, Tokuo Ohnishi, Shoji Taki, Kohei Oishi and Nobuyuki Fujiwara : Effectiveness of Line Voltage Control by Photovoltaic Generation System in Daily Operation, National Convention Record I.E.E. Japan, Vol.6, No.062, 104, Mar. 2007.
277.	Yuki Fujimura, Masahide Hojo, Tokuo Ohnishi and Toshihisa Funabashi : Studies on Fault Current Limiter by Voltage Source Inverter Based on Line Current Detection, National Convention Record I.E.E. Japan, Vol.6, No.054, 91, Mar. 2007.
278.	Naoji Yamada, Tokuo Ohnishi and Masahide Hojo : Current Controlled Type Sinusoidal Voltage Interconnecting Three-Phase Inverter, National Convention Record I.E.E. Japan, Vol.4, No.76, 115, Mar. 2007.
279.	Shigekazu Sakai, Yasuhiro Hayashi, Shoji Kawasaki, Junya Matsuki, Jumpei Baba, Akihiko Yokoyama, Masahide Hojo, Shinji Wakao, Naoki Kobayashi and Kohei Oishi : Verification of Coordinated Control of Distribution Network with Distributed Generators by Distribution Network Equipment, National Convention Record I.E.E. Japan, Vol.6, No.115, 189-190, Mar. 2007.
280.	Hirotaka Kikuya, Shoji Kawasaki, Yasuhiro Hayashi, Junya Matsuki and Masahide Hojo : Basic Study on Optimal Installation Location of Active Filter in Distribution Network, National Convention Record I.E.E. Japan, Vol.6, No.102, 169-170, Mar. 2007.
281.	Hiroki Ishiuchi, Tokuo Ohnishi and Masahide Hojo : Driving Characteristics of PM Motor by Sensorless V/f Control System with Oscillation Suppression, National Convention Record I.E.E. Japan, Vol.4, No.133, 214, Mar. 2007.
282.	Toshiya Yamada, Tokuo Ohnishi and Masahide Hojo : Control Characteristics of Autonomous Power Supply System using Grid Voltage Sensorless Controlled Inverter, National Convention Record I.E.E. Japan, Vol.6, No.001, 1, Mar. 2007.
283.	Kohei Ishihara, Tokuo Ohnishi and Masahide Hojo : Experiment Characteristic of Three-Phase Bidirectional Power Conversion System without Electrolytic Capacitor, National Convention Record I.E.E. Japan, Vol.4, No.88, 137, Mar. 2007.
284.	Kenji Yamanaka, Tokuo Ohnishi and Masahide Hojo : Low-speed High Torque Drive Characteristics of Sensorless Control System for Permanent Magnet Synchronous Motor, National Convention Record I.E.E. Japan, Vol.4, No.122, 194, Mar. 2007.
285.	Masahide Hojo, Tokuo Ohnishi, Yasunori Mitani, Hiroyuki Ukai and Osamu Saeki : A Study on Relations between Frequency and Phase Difference in Interconnected Power Systems Based on Phasor Measurements, 電気関係学会東海支部連合大会講演論文集, Vol.S3, No.4, Sep. 2006.
286.	Naoji Yamada, Masahide Hojo and Tokuo Ohnishi : Basic Analysis for a Mitigation Method of Line Voltage Distortion by Two Photovoltaic Generation Systems, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.18, 52, Sep. 2006.
287.	Akira Izume, Masahide Hojo, Tokuo Ohnishi, Shoji Taki, Kohei Oishi and Nobuyuki Fujiwara : A Study for Sharing Method of Reactive Power Compensation by Utility Interactive Inverter for Photovoltaic Generation System, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.17, 51, Sep. 2006.
288.	Toshiya Yamada, Tokuo Ohnishi and Masahide Hojo : Autonomous Power Supply System Using Grid Voltage Sensorless Controlled Three Phase PWM Inverter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.16, 50, Sep. 2006.
289.	Yuki Fujimura, Masahide Hojo, Tokuo Ohnishi and Toshihisa Funabashi : Examination of Fault Current Limiter with Harmonics Compensation by Voltage Source Inverter Based of Experimental Studies, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.15, 49, Sep. 2006.
290.	Kohei Ishihara, Tokuo Ohnishi and Masahide Hojo : Basic Characteristics of Three-Phase Bidirectional Power Conversion System without Electrolytic Capacitor, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.14, 48, Sep. 2006.
291.	Tokuo Ohnishi and Masahide Hojo : Control Method of Single-phase to Single-phase Power Converter Using a Three Phase Inverter Switching Module, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.13, 47, Sep. 2006.
292.	Toshiyuki Kaichi, Tokuo Ohnishi and Masahide Hojo : Ripple Power Suppression Using Cascade Bidirectional Chopper for Charge and Discharge, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.12, 46, Sep. 2006.
293.	Yusuke Morimoto, Tokuo Ohnishi and Masahide Hojo : Experimental Characteristics of Three-Phase Active Filter with Load Terminal Voltage Differentiation Loop, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.11, 45, Sep. 2006.
294.	Tomoharu Fujii, Tokuo Ohnishi and Masahide Hojo : Three-Phase Stabilized AC Power Supply by Using Series Inverter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.10, 44, Sep. 2006.
295.	Ryosuke Abe, Masahide Hojo and Tokuo Ohnishi : Studies on Operating Characteristics of UPFC at Dynamic Voltage Restoration, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.9, 43, Sep. 2006.
296.	Yusuke Shima, Tokuo Ohnishi, Masahide Hojo and Akihiko Iwata : Experimental Characteristics of Multilevel Inverter with Improved Waveform, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.8, 42, Sep. 2006.
297.	Masashi Ogura, Tokuo Ohnishi and Masahide Hojo : Experimental Characteristics of Three-Phase Rectifier Circuit by Multilevel Current Waveform Control, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.7, 41, Sep. 2006.
298.	Hiroki Ishiuchi, Tokuo Ohnishi, Masahide Hojo and Mitsuyuki Kiuchi : Oscillation Suppression of Sensorless V/f Control System for PMSM, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.4, No.6, 34, Sep. 2006.
299.	Kenji Yamanaka, Tokuo Ohnishi and Masahide Hojo : Low-Speed Drive Characteristic of Sensorless Control System for Permanent Magnet Synchronous Motor, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.4, No.5, 33, Sep. 2006.
300.	Akira Izume, Masahide Hojo, Tokuo Ohnishi, Shoji Taki, Kohei Oishi and Nobuyuki Fujiwara : A Study of Reactive Power Compensation Method by Utility Interactive Inverter of Photovoltaic Generation System for Suppression of Voltage Rise, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.35, No.355, 13-14, Sep. 2006. (Summary) 太陽光発電システムが多数系統連系されることによる配電線電圧変動が懸念されている．その対策として，太陽光発電システムの出力有効電力の低減や系統からの解列などが考えられているが，太陽光発電の出力抑制は設備利用率の面などから得策ではない．そこで本研究では，太陽光発電系統連系インバータに無効電力制御を付加することによる電圧変動抑制を提案する．これにより，出力有効電力抑制や解列が不要になるだけでなく，配電線電圧の高速かつ連続的な調整が可能になることも期待できる．様々なシミュレーション解析の結果，十分な電圧変動抑制の効果を得ることができたので，その結果について報告する．
301.	Yasuhiro Hayashi, Shoji Kawasaki, Junya Matsuki, Shigekazu Sakai, Jumpei Baba, Akihiko Yokoyama, Masahide Hojo, Shinji Wakao, Naoki Kobayashi and Kohei Oishi : Basic Experiment of Sending Voltage Control in Distribution Network Equipment Connected with Distributed Generators, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.35, No.353, 9-10, Sep. 2006. (Summary) 自然エネルギー利用分散型電源の系統連系実績数の増加に伴い，逆潮流による電圧上昇など分散型電源の系統連系に対する課題等が議論されている．分散型電源の連系による配電系統への影響や効果は，計算機シミュレーションにより多くの検証がなされているが，実験による検証は極めて少ない．そこで，分散型電源の系統連系による課題の解決支援のために6.6kV配電系統を縮小模擬した分散型電源連系配電ネットワーク模擬実験設備を現在構築中である．構築中の実験設備を用いて送出し電圧や分散型電源の出力を変化させた場合の電圧・電流の計測実験を行ったので，実験結果を報告する．
302.	Masahide Hojo, Tokuo Ohnishi, Yasunori Mitani, Osamu Saeki and Hiroyuki Ukai : A Study on the Relation between Phase Difference and Power Flow Based on Synchronized Phasor Measurement, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.44, No.421, 5-6, Sep. 2006. (Summary) 筆者らは，中西日本60Hz系統内の複数の大学にフェーザ計測ユニットを設置し，継続的な多地点同期位相計測を行っている．本計測システムにより，複数地点間の位相差を時系列データとして得ることができる．この2地点間の位相差は，2地点間の潮流量と密接な関係があると考えられ，これまでに周波数変動の動特性を把握できたという研究成果を上げている．そこで，本報告では，多地点位相計測システムにより得られた位相差の時系列データと連系線電力潮流量について，系統の末端である需要家において入手可能なデータに基づき検討を行った結果について述べる．
303.	Kiyohiro Tsuboi, Koji Hirose, Yutaka Ota, Takuhei Hashiguchi, Hiroyuki Ukai, Yasunori Mitani, Osamu Saeki and Masahide Hojo : Phasor Data Concentrator for Japanese Wide-area Power System, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.44, No.419, 1-2, Sep. 2006. (Summary) 現在, 全国10大学にGPSを用いた時刻同期の機能を有する同期フェーザ計測装置PMUを設置し, 動特性を常時観測している．以上のような動特性観測システムによる安定度把握を行うためには, 観測データを逐次処理し, 異常検出を行え, かつメンテナンスが容易なシステム構築が必要である．そこで本論文ではこれらの克服を図るネットワーク管理システムを構築した．その結果, ネットワーク異常によるデータファイルの欠損や，GPSの時間異常, 事故や停電などが効果的に検出されており, データ整理と大幅なメンテナンスの容易化及び, 動特性解析に有用な情報の抽出が可能となった．
304.	Yuki Fujimura, Masahide Hojo and Tokuo Ohnishi : Basic Experiment of Fault Current Limiter with Harmonics Compensation by Voltage Source Inverter, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.48, No.458, 25-26, Sep. 2006.
305.	Naoji Yamada, Masahide Hojo and Tokuo Ohnishi : A Mitigation Method of Line Voltage Distribution According to the Output of Photovoltaic Generation System, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.48, No.457, 23-24, Sep. 2006. (Summary) 近年，半導体電力変換装置の普及により高調波障害の例が報告されている．対策として，アクティブフィルタが効果的であるが比較的高価であり，積極的な導入には至っていない．一方，太陽光発電システムの普及が近年急速に進んでおり，夜間など太陽電池出力がない場合，系統連系インバータは空き容量として存在する．<br>これを有効活用する方策として，系統連系インバータの余剰容量をオンラインで評価しつつ，補償の深さを可変とする高調波補償制御システムについて検討した．配電システムの電圧歪みが大きくなる夜間帯に系統連系インバータが空き容量として存在することから，本制御システムは高い補償効果を望むことができる．
306.	Tomoharu Fujii, Tokuo Ohnishi and Masahide Hojo : Experimental Characteristics of Stabilized AC Power Supply by Using Series Inverter, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.111, 549-550, Aug. 2006.
307.	Kenji Yamanaka, Tokuo Ohnishi and Masahide Hojo : Experimental Characteristics of Sensorless Control for Permanent Magnet Synchronous Motor, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.68, 407-410, Aug. 2006.
308.	Hiroyuki Ukai, Yutaka Ota, Takuhei Hashiguchi, Yasunori Mitani, Masahide Hojo and Osamu Saeki : Monitoring System in Wide Area Power System Based on Synchronized Measurement and Signal Processing, Proceedings of the Japan Industry Applications Society Conference, Vol.2, No.S12-1, 199-202, Aug. 2006.
309.	Ryosuke Abe, Masahide Hojo and Tokuo Ohnishi : Basic Analysis of Fault Current Limiter with Dynamic Voltage Restoration by Using UPFC, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.52, 349-350, Aug. 2006.
310.	Yusuke Morimoto, Tokuo Ohnishi and Masahide Hojo : Control Characteristics of Line Current Detection Type Three-phase Active Filter with Waveform Improvement of Load Terminal Voltage, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.49, 339-340, Aug. 2006.
311.	Kohei Ishihara, Tokuo Ohnishi and Masahide Hojo : Three-Phase Bidirectional Power Conversion System without Electrolytic Capacitor, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.5, Aug. 2006.
312.	Toshiya Yamada, Tokuo Ohnishi and Masahide Hojo : Three Phase PWM Converter by Line Voltage Sensorless, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.4, Aug. 2006.
313.	Yusuke Shima, Tokuo Ohnishi, Masahide Hojo and Akihiko Iwata : Improvement of Ouput Waveform by Combination Controlled Multilevel Inverter, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.45, 321-322, Aug. 2006.
314.	Masashi Ogura, Tokuo Ohnishi and Masahide Hojo : Three-Phase Rectifier Circuit by Multilevel Current Waveform Control, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.44, 319-320, Aug. 2006.
315.	Tokuo Ohnishi, Kenji Yamanaka and Masahide Hojo : Sensorless Current Vector Control Characteristics of Induction Motor, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.27, 255-256, Aug. 2006.
316.	Toshiyuki Kaichi, Tokuo Ohnishi and Masahide Hojo : Experimental Characteristics of Output Control for Solar Cell Using Cascade Boost Chopper Circuit, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.19, 229-230, Aug. 2006.
317.	Yasuhiro Hayashi, Shoji Kawasaki, Junya Matsuki, Shigekazu Sakai, Jumpei Baba, Akihiko Yokoyama, Masahide Hojo, Shinji Wakao, Naoki Kobayashi and Kohei Oishi : Development of Prototype of Distribution Network Equipment with Distributed Generators, National Convention Record I.E.E. Japan, Vol.6, No.113, 192-193, Mar. 2006.
318.	Takuhei Hashiguchi, Hiroyuki Ukai, Yasunori Mitani, Osamu Saeki and Masahide Hojo : Frequency Characteristics of Power System Oscillations Based on Multiple Synchronized Phasor Measurements, National Convention Record I.E.E. Japan, Vol.6, No.173, 295-296, Mar. 2006.
319.	Ryosuke Abe, Masahide Hojo and Tokuo Ohnishi : Basic Studies on a Fault Current Limiter by UPFC, National Convention Record I.E.E. Japan, Vol.4, No.161, Mar. 2006.
320.	Yusuke Morimoto, Tokuo Ohnishi and Masahide Hojo : Source Current Detection Type Three-Phase Active Filter with Source Current Differentiation Loop, National Convention Record I.E.E. Japan, Vol.4, No.151, Mar. 2006.
321.	Tomoharu Fujii, Tokuo Ohnishi and Masahide Hojo : Control Method of Stabilized AC Power Supply by Using Series Inverter, National Convention Record I.E.E. Japan, Vol.4, No.156, Mar. 2006.
322.	Masashi Ogura, Tokuo Ohnishi and Masahide Hojo : Multi-Level Waveform Improvement Method for Three Phase Rectifier Circuit, National Convention Record I.E.E. Japan, Vol.4, No.147, Mar. 2006.
323.	Yusuke Shima, Tokuo Ohnishi, Masahide Hojo and Akihiko Iwata : Control Method for Decrease of Capacitance of Multilevel Inverter, National Convention Record I.E.E. Japan, Vol.4, No.68, Mar. 2006.
324.	Tokuo Ohnishi and Masahide Hojo : Power Quality Compensator by using A Three Phase Switching Power Device Module, National Convention Record I.E.E. Japan, Vol.4, No.162, Mar. 2006.
325.	Toshiyuki Kaichi, Tokuo Ohnishi and Masahide Hojo : Cascade Bidirectional Chopper for Charge and Discharge Control, National Convention Record I.E.E. Japan, Vol.4, No.30, Mar. 2006.
326.	Kenji Yamanaka, Tokuo Ohnishi and Masahide Hojo : Drive Characteristic of A Novel Sensorless Control System for Permanent Magnet Synchronous Motor, National Convention Record I.E.E. Japan, Vol.4, No.114, Mar. 2006.
327.	Kensuke Kaneda, Masahide Hojo and Tokuo Ohnishi : 直列型と並列型のアクティブフィルタの併用による高調波補償, 第161回定例研究会講演予稿集, 29, Dec. 2005.
328.	Yusuke Shima, Tokuo Ohnishi, Masahide Hojo and Akihiko Iwata : Experimental Characteristics of AC Power Supply by Combination Controlled Multilevel Inverter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.9, 66, Sep. 2005.
329.	Yusuke Morimoto, Tokuo Ohnishi and Masahide Hojo : Resonance Suppression of Source Current Detection Type Three-Phase Active Power Filter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.8, 65, Sep. 2005.
330.	Tomoharu Fujii, Tokuo Ohnishi and Masahide Hojo : Low Distortion AC Power Supply Controlled by Using Series Inverter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.7, 64, Sep. 2005.
331.	Tokuo Ohnishi, Masahide Hojo and Hisatoshi Akiyama : Switching Controlled Active Capacitor, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.6, 63, Sep. 2005.
332.	Kensuke Kaneda, Masahide Hojo and Tokuo Ohnishi : Experimental Characteristics of Harmonics Compensation Effect by Series Active Filter in Distribution System, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.5, 62, Sep. 2005.
333.	Masashi Ogura, Tokuo Ohnishi and Masahide Hojo : Experimental Characteristics of Active Filter by Multi-Level Current Control, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.4, 61, Sep. 2005.
334.	Toshiyuki Kaichi, Tokuo Ohnishi and Masahide Hojo : Output Control of Solar Cell using Cascade Boost Chopper Circuit, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.3, 60, Sep. 2005.
335.	Tatsuya Aiso, Tokuo Ohnishi and Masahide Hojo : Time Sharing MPPT Control for Three PV Panel Blocks using Buck-Boost Combination Chopper Circuit, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.2, 59, Sep. 2005.
336.	Kenji Yamanaka, Tokuo Ohnishi and Masahide Hojo : Experimental Characteristic of Sensorless Control System for Permanent Magnet Synchronous Motor, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.1, 58, Sep. 2005.
337.	Yoshinori Ito, Tokuo Ohnishi and Masahide Hojo : Experimental Characteristics of Grid Interconnecting Inverter with Active Filter by Terminal Voltage Compensation, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.4, No.1, 51, Sep. 2005.
338.	Yasunori Mitani, Masayuki Watanabe, Hiroyuki Ukai, Osamu Saeki and Masahide Hojo : Power System Observation by Signal Processing of Distributed Phasor Measurements, 第15回インテリジェント·システム·シンポジウム, Sep. 2005.
339.	Takuhei Hashiguchi, Yutaka Ota, Hiroyuki Ukai, Yasunori Mitani, Osamu Saeki and Masahide Hojo : 多地点同期フェーザ量計測に基づく電力動揺検出法, 電気関係学会東海支部連合大会講演論文集, Vol.O, No.021, Sep. 2005.
340.	Kenji Yamanaka, Tokuo Ohnishi and Masahide Hojo : Sensorless Control System for Permanent Magnet Synchronous Motor, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.51, 233-234, Aug. 2005.
341.	Toshiyuki Kaichi, Masahide Hojo and Tokuo Ohnishi : Output Control of Solar Cell by Series/Parallel-Controlled Chopper, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.113, Aug. 2005.
342.	Tomoharu Fujii, Masahide Hojo and Tokuo Ohnishi : Instantaneous Voltage Drop Compensation Method for Generator Impedance, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.118, Aug. 2005.
343.	Yusuke Shima, Masahide Hojo, Tokuo Ohnishi and Akihiko Iwata : AC Power Supply by Combination Controlled Multilevel Inverter, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.106, Aug. 2005.
344.	Masashi Ogura, Masahide Hojo and Tokuo Ohnishi : Active Filter by Multi-Level Current Control, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.95, Aug. 2005.
345.	Yusuke Morimoto, Masahide Hojo and Tokuo Ohnishi : Resonance Suppression of Source Current Detection Type Active Filter with Voltage Differentiation Loop, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.94, Aug. 2005.
346.	Yoshinori Ito, Tokuo Ohnishi and Masahide Hojo : Grid Interconnecting Inverter with Active Filter by Detecting Terminal Voltage, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.28, 147-148, Aug. 2005.
347.	Yutaka Ota, Takuhei Hashiguchi, Hiroyuki Ukai, Yasunori Mitani, Masahide Hojo and Osamu Saeki : Power Oscillation Evaluation of Japanese Wide-area Power Systems under Disturbances, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.11, No.165, 17-18, Aug. 2005. (Summary) 筆者らは, PMUを西日本60Hz系統, 東日本50Hz系統の合計10大学の構内に設置することにより, 100Vコンセントの位相角情報から電力動揺を評価するシステムを構築してきた．2002年からの計測期間において, いくつかの発電機脱落や負荷脱落など外乱時の計測が行われているため, 本論文ではこれらの外乱時の動揺周期・減衰, そして各地域の動揺振幅, 動揺時間差から西日本60Hz系統, 東日本50Hz系統における電力動揺評価を行う．
348.	Masahide Hojo and Tokuo Ohnishi : A Study on Harmonic Mitigation Methods by Utilization of Inverters for Photoboltaic Array Interconnection, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.4, No.118, 5-6, Aug. 2005. (Summary) 近年の太陽光発電システムの急速な普及に伴い,その配電システムへの連系台数も増加の一途にある．このための連系インバータは,正弦波電流による連系を行うのが通例である．一方,配電システムで問題となっている高調波問題への対策として,系統連系インバータの活用の可能性が指摘されはじめている．しかし,容量制約を有する連系インバータにおいて効果的なアクティブフィルタ機能を実現するためには,その容量の範囲内で高調波補償に寄与することができるような制御システムが望まれる．本研究は,連系インバータの余剰容量をオンラインで評価しつつ高調波補償の深さを柔軟に制御可能な連系インバータ制御システムの検討を行ったものである．
349.	Kenji Yamanaka, Masahide Hojo and Tokuo Ohnishi : Precise Position Estimation Method from Irregular Interval Signals of Hall Sensors for Brushless DC Motor Drive, National Convention Record I.E.E. Japan, Vol.4, No.145, 231, Mar. 2005.
350.	Yoshinori Ito, Masahide Hojo and Tokuo Ohnishi : Experimental Characteristics of Load Terminal Voltage Controlled Grid Interconnecting Inverter, National Convention Record I.E.E. Japan, Vol.4, No.172, 280, Mar. 2005.
351.	Tatsuya Aiso, Masahide Hojo and Tokuo Ohnishi : Experimental Characteristics of Time Sharing MPPT Controlled Solar Cell System, National Convention Record I.E.E. Japan, Vol.4, No.115, 179, Mar. 2005.
352.	Kensuke Kaneda, Masahide Hojo and Tokuo Ohnishi : Studies on Harmonics Compensation Effect by Series and Parallel Active Filter, National Convention Record I.E.E. Japan, Vol.4, No.158, 255, Mar. 2005.
353.	Kazuya Ohnishi, Masahide Hojo, Tokuo Ohnishi, Yasunori Mitani, Osamu Saeki and Hiroyuki Ukai : Studies on Power Flow Estimation by Multiple Synchronized Phasor Measurements, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.14, 71, Sep. 2004.
354.	Norihito Kuroe, Masahide Hojo and Tokuo Ohnishi : Effect of FCL Characteristics by Transformer Saturation Phenomena, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.13, 70, Sep. 2004.
355.	Kensuke Kaneda, Masahide Hojo and Tokuo Ohnishi : Studies on PV System with Regulation of Harmonics Compensation, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.12, 69, Sep. 2004.
356.	Kennichiro Ueki, Masahide Hojo and Tokuo Ohnishi : The impression to Anti-resonance Damping for Harmonics Compensator by Connecting Capacitor for Power Factor Improvement, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.11, 68, Sep. 2004.
357.	Yuya Kimura, Masahide Hojo and Tokuo Ohnishi : Experimental Characteristics of DC Voltage Sensorless AC/DC Conveter System Considering Voltage Ripple, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.10, 67, Sep. 2004.
358.	Yoshinori Ito, Masahide Hojo and Tokuo Ohnishi : Load Terminal Voltage Waveform Controlled Grid Interconnecting PWM Inverter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.9, 66, Sep. 2004.
359.	Tatsuya Aiso, Masahide Hojo and Tokuo Ohnishi : Time Sharing MPPT Control for Multiple Solar Battery Blocks, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.8, 65, Sep. 2004.
360.	Kenji Yamanaka, Masahide Hojo and Tokuo Ohnishi : Position control of the brushless DC motor using hall sensors, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, Vol.5, No.6, 63, Sep. 2004.
361.	Kenichiro Ueki, Masahide Hojo and Tokuo Ohnishi : Active Filter with Improvement of Load Terminal Voltage Waveform, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.61, 351-352, Sep. 2004.
362.	Kenji Yamanaka, Masahide Hojo and Tokuo Ohnishi : Experimental Tests of Control System for Brushless DC Motor Using Hall Sensors, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.81, Sep. 2004.
363.	Kensuke Kaneda, Masahide Hojo and Tokuo Ohnishi : Studies on Harmonics Compensation by SSSC and Dispersed Generation, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.108, Sep. 2004.
364.	Tatsuya Aiso, Masahide Hojo and Tokuo Ohnishi : Solar Cell MPPT Control System by Time Sharing, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.99, Sep. 2004.
365.	Yoshinori Ito, Masahide Hojo and Tokuo Ohnishi : Experimental Characteristics of Sinusoidal Voltage Interconnecting PV Generation System, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.97, Sep. 2004.
366.	Yuya Kimura, Masahide Hojo and Tokuo Ohnishi : DC Voltage Sensorless AC/DC Converter System Considering Voltage Ripple, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.4, 135-136, Sep. 2004.
367.	Toru Makita, Yasunori Mitani, Masahide Hojo and Hiroyuki Ukai : Estimation of Generator Power Swing Characteristics Using Multiple Synchronized Phasor Measurements, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.17, No.207, 7-8, Aug. 2004. (Summary) 西日本60Hz系統には，長周期の電力動揺，局所的な発電機動揺，系統間の周波数制御に伴う動揺など，くし型連係に起因する様々な系統動揺の存在が確認されている．現在，全国9箇所にPMU(Phasor Measurement Unit)を設置することにより，得られたデータに各種解析を行うことでそれら動揺特性の解析を行っている．今回，PMUから得られる位相角情報を利用する応用例として，1つのPMUを発電機所内電源から計測し，もう1つを大規模な需要地系統内に設置することで，一機無限大母線系統として考え，特定の発電機が電力系統に繋がった状態での動特性を推定した．この方法によれば，単独の発電機が系統に並列に接続されている場合などに，発電機動揺の特性を推定できるものと期待される．
368.	Satoshi Abe, Yasunori Mitani, Osamu Saeki, Hiroyuki Ukai and Masahide Hojo : Analysis of Power System Swing and Load Fluctuation Using Multiple Synchronized Phasor Measurements, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.17, No.206, 5-6, Aug. 2004. (Summary) 西日本60Hz系統は主要な6電力会社が連携して構成されており，局所的，大域的なさまざまな動揺が混在するシステムである．とくに，そのくし型構造に起因して系統全体で発生する長周期の電力動揺の存在がよく知られている．そこで，時刻同期の機能を持つ位相計測装置を西日本の各地の大学に設置し，この計測システムから得られた位相動揺データに対してWavelet変換を適用することにより，時間情報を保って動揺特性を周波数分解し各成分において動揺特性の解析を行うことを検討している．
369.	Takuhei Hashiguchi, Yasunori Mitani, Osamu Saeki, Kiichiro Tsuji, Masahide Hojo, Hiroyuki Ukai, Masayuki Watanabe and Akihiro Matsushita : Identification of Characterization Factor for Power System Oscillation Based on Multiple Synchronized Phasor Measurements, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.17, No.204, 1-2, Aug. 2004. (Summary) 著者らはGPS(Global Positioning System)を用いたフェーザ計測ユニット(Phasor Measurement Unit:PMU)を日本各地の大学に設置し,単相交流電源の位相角情報から系統の広域動揺特性の観測を行っている．本論文では,PMUの計測データから,西日本60Hzくし形系統で発生する最も周期が長い第1モード(長周期動揺)と次に周期が長い第2モードを検出することができた．またこの2つのモード間には相互作用が働く連成モデルであることを考慮した2自由度系振動モデルを構築した．このモデルを用いることで,第1モード(長周期動揺)と第2モードの特性係数を導出することが可能であり,弱減衰の長周期動揺とそのモード間で相互作用を生じる第2モードの安定度監視が可能になると考えられる．
370.	Yutaka Ota, Hiroyuki Ukai, Koichi Nakamura, Yasunori Mitani, Masahide Hojo, Osamu Saeki, Yukihiro Onoue, Hisanori Ito and Kazuaki Nagaura : Observation of Power Oscillation on Tie-line under Generator Dropping Condition and Estimation of Interconnected Power System Parameters, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.16, No.200, 5-6, Aug. 2004. (Summary) 電力自由化や電力設備の一層の効率化などにより, 連系線が限界運用されると, 連系系統の結びつきが強くなり, 系統間動揺など系統をまたぐ現象が顕著化する可能性がある．このような状況下でも安定運用するためには, 隣接系統の状況を適切に把握した上で, 自系統を運用する必要がある．本論文では, 隣接系統の状況を示す情報として, 連系線潮流と連系線の位相角差に着目し, 系統記録装置(PQVFメータ)と多地点同期フェーザ計測装置(PMU)による観測結果から, 定常時および発電機脱落発生後の過渡状態での電力動揺を検出し, 評価する．さらに, これらの電力動揺情報から, 連系系統のパラメータを推定する方法について検討を行う．
371.	Masanori Kawakita, Yutaka Ota, Hiroyuki Ukai, Koichi Nakamura, Yasunori Mitani, Masahide Hojo and Osamu Saeki : Evaluation of Time Difference of Japanese 60Hz Systems by using Synchronized Phasor Measurements, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.2, No.108, 9-10, Aug. 2004. (Summary) 電力自由化に備えて各社公正な周波数制御方法にすることや連系線潮流の一層の厳正管理を目的として, 西日本60Hz系統では, 平成12年4月から全社TBC方式により周波数運用が行われている．この方式では, 周波数と連系線潮流の仕上がりは良好であるが, 時差が拡大傾向にあることが報告されている．筆者らは, 西日本60Hz系統の各大学において, GPSの時間情報に基づいた多地点同期位相角観測網(PMU)を構築しており, 高精度に時間同期がとれた位相角から時差を容易に評価することが可能である．そこで, 西日本60Hz系統の時差の長期間(一ヶ月)を通しての変動や, 時差補正の結果などから, 時差に関する実態の評価を行う．
372.	Akihiro Matsushita, Yasunori Mitani, Osamu Saeki, Masahide Hojo and Hiroyuki Ukai : Analysis of the Electric Power System Dynamics by Emergency Shutdown of a Generator, National Convention Record I.E.E. Japan, Vol.6, No.127, 219-220, Mar. 2004.
373.	Megumi Katayama, Yasunori Mitani, Osamu Saeki, Masahide Hojo and Hiroyuki Ukai : Analysis of Variation of Phase Difference between Two Areas by Synchronized Phasor Measurement, National Convention Record I.E.E. Japan, Vol.6, No.106, 183-184, Mar. 2004.
374.	Takuhei Hashiguchi, Masamichi Yoshimoto, Osamu Saeki, Kiichiro Tsuji, Yasunori Mitani, Masahide Hojo, Hiroyuki Ukai and Junichi Toyoda : Analysis of Frequency Variation Followed by Power System Disturbance, National Convention Record I.E.E. Japan, Vol.6, No.107, 185-186, Mar. 2004.
375.	Kazuya Ohnishi, Masahide Hojo, Tokuo Ohnishi, Yasunori Mitani, Osamu Saeki and Hiroyuki Ukai : Estimation of Power System Disturbances by Synchronized Phasor Measurements, National Convention Record I.E.E. Japan, Vol.6, No.108, 187, Mar. 2004.
376.	Yuya Kimura, Masahide Hojo and Tokuo Ohnishi : Fundamental Control Characteristics of DC Voltage Sensorless AC/DC Converter System, National Convention Record I.E.E. Japan, Vol.4, No.41, 63, Mar. 2004.
377.	Tokuo Ohnishi and Masahide Hojo : Line Current Detection Type Active Filter with Improvement for Load Terminal Voltage Waveform, National Convention Record I.E.E. Japan, Vol.4, No.149, 237, Mar. 2004.
378.	Kenichiro Ueki, Masahide Hojo and Tokuo Ohnishi : Experimental Verification of Harmonics Compensator by Equivalent Resistive Load Control, National Convention Record I.E.E. Japan, Vol.4, No.146, 232, Mar. 2004.
379.	Norihito Kuroe, Masahide Hojo and Tokuo Ohnishi : Experimental Verification of Fault Current Limiter Using Voltage Source Inverter, National Convention Record I.E.E. Japan, Vol.6, No.18, 29, Mar. 2004.
380.	Masahide Hojo, Norihito Kuroe and Tokuo Ohnishi : Fault Current Limiter with Power Quality Regulation, National Convention Record I.E.E. Japan, Vol.6, No.15, 24, Mar. 2004.
381.	Kazuya Ohnishi, Masahide Hojo and Tokuo Ohnishi : Studies of Harmonic Voltage Variations Based on Measurement Results, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.7-2, 101, Oct. 2003.
382.	Tokuo Ohnishi, Kenichiro Ueki and Masahide Hojo : Stabilized Control of Line-Current-Detection-Type Active Filter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-14, 93, Oct. 2003.
383.	Kenichiro Ueki, Masahide Hojo and Tokuo Ohnishi : Suppression Control Method for Harmonics Compensator by Equivalent Resistive Load Control, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-15, 94, Oct. 2003.
384.	Masahide Hojo, Norihito Kuroe and Tokuo Ohnishi : Studies on Fault Current Limiter with Harmonic Voltage Compensation, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-9, 88, Oct. 2003.
385.	Norihito Kuroe, Masahide Hojo and Tokuo Ohnishi : Fault Current Limiter with Instant Sag Compensation, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-8, 87, Oct. 2003.
386.	Nobuyuki Asai, Masahide Hojo and Tokuo Ohnishi : Experimental Characteristics of PFC Converter with Capacitor Charge Control, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-11, 90, Oct. 2003.
387.	Noriaki Miyoshi, Masahide Hojo and Tokuo Ohnishi : The Simple Power Control of the Solar Cell by Fixed Operating Resistance Control, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-10, 89, Oct. 2003.
388.	Masato Ohgata, Masahide Hojo and Tokuo Ohnishi : Alternating Current Control by Direct Current Detection of Three Phase Voltage Fed Type PWM Inverter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-12, 91, Oct. 2003.
389.	Norihito Kuroe, Masahide Hojo and Tokuo Ohnishi : Design of Fault Current Limiter using Voltage Source Inverter, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.57, 57, Aug. 2003.
390.	Kazuya Ohnishi, Masahide Hojo and Tokuo Ohnishi : Measurements of Harmonic Voltage Variations for Power Quality Assessments, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.55, 55, Aug. 2003.
391.	Kenichiro Ueki, Masahide Hojo and Tokuo Ohnishi : Single-Phase Harmonics Compensator by Equivalent Resistive Load Control, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.52, 52, Aug. 2003.
392.	Yuya Kimura, Masahide Hojo and Tokuo Ohnishi : PWM Control Method of DC Voltage Sensorless Single-phase AC/DC Converter, Proceedings of the Japan Industry Applications Society Conference, Vol.Y, No.26, 26, Aug. 2003.
393.	Masanori Kawakita, Yutaka Ota, Hiroyuki Ukai, Koichi Nakamura, Yasunori Mitani, Osamu Saeki and Masahide Hojo : Calculation of Parameters for Power System Oscillation based on Synchronized Phasor Measurements, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.A, No.129, 385-386, Aug. 2003.
394.	Masahide Hojo, Tokuo Ohnishi, Yasunori Mitani, Osamu Saeki and Hiroyuki Ukai : Analysis of Frequency Oscillation Characteristics based on Multiple Synchronized Phasor Measurements, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.A, No.184, 495-496, Aug. 2003. (Summary) 系統連系によって大規模システムとして成長してきた電力系統であるが，電力市場の自由化や分散型電源の多数導入などにより，今後は益々系統状態の把握が困難となってくることが予想される．著者らは，西日本系統内の複数の大学にフェーザ計測装置を設置し，GPS信号を用いて，各地における家庭用コンセントの端子電圧の電圧位相角及び実効値の同期計測が可能なシステムを構築した．これにより得られる周波数偏差の時系列データに基づき，西日本60Hz系統内の各地域及び地域間における周波数変動の観測を行っている．本稿では，測定結果に用いてウェーブレット解析手法に基づく周波数変動の時間-周波数解析を行った結果について述べる．
395.	Tokuo Ohnishi and Masahide Hojo : Three-Phase Power Line Harmonics Compensator by Equivalent Resistive Load Control, National Convention Record I.E.E. Japan, Vol.4, No.188, 305, Mar. 2003.
396.	Masahide Hojo and Tokuo Ohnishi : Experimental Characteristics of Three-Phase Power Line Harmonics Compensator, National Convention Record I.E.E. Japan, Vol.4, No.187, 304, Mar. 2003.
397.	Masamichi Yoshimoto, Takuhei Hashiguchi, Yasunori Mitani, Osamu Saeki, Kiichiro Tsuji, Hiroyuki Ukai and Masahide Hojo : Analysis of Detailed Local Oscillation Characteristics for Japan Western 60Hz Power System Based on Multiple Synchronized Phasor Measurements, National Convention Record I.E.E. Japan, Vol.6, No.092, 153-154, Mar. 2003.
398.	Nobuyuki Asai, Masahide Hojo and Tokuo Ohnishi : Active Controlled Smoothing Capacitor, National Convention Record I.E.E. Japan, Vol.4, No.078, 115, Mar. 2003.
399.	Masato Ohgata, Masahide Hojo and Tokuo Ohnishi : High Efficiency Induction Motor Drive System Corresponded by Solar Cell, National Convention Record I.E.E. Japan, Vol.4, No.026, 32, Mar. 2003.
400.	Noriaki Miyoshi, Masahide Hojo and Tokuo Ohnishi : Maximum Power Control of the Solar Cell by Means of Operating Resistance Matching, National Convention Record I.E.E. Japan, Vol.4, No.019, 24, Mar. 2003.
401.	Masahide Hojo and Tokuo Ohnishi : Operating Characteristics of Fault Current Limiter with SSSC under Unbalanced Fault Condition, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-6, 65, Oct. 2002.
402.	Nobuyuki Asai, Masahide Hojo and Tokuo Ohnishi : Improvement of Transient Response for Voltage Interuption of PFC Rectifier Circuit with High-Voltage Capacitor, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-15, 74, Oct. 2002.
403.	Noriaki Miyoshi, Masahide Hojo and Tokuo Ohnishi : Maximum Power Control of Solar Cell by Means of Operating Resistance Matching, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-14, 73, Oct. 2002.
404.	Masato Ohgata, Masahide Hojo and Tokuo Ohnishi : High Efficiency Induction Motor Drive System Corresponding to Load Torque Characteristics, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-13, 72, Oct. 2002.
405.	Kazuhiro Hara, Masahide Hojo and Tokuo Ohnishi : Capacity Reduction Characteristics of Three-Phase Power Line Harmonics Compensator, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-8, 67, Oct. 2002.
406.	Tadao Nagase, Masahide Hojo and Tokuo Ohnishi : Experimental Characteristics of Three Phase PWM Rectifier Circuit by Sinusoidal Voltage Interaction, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-9, 68, Oct. 2002.
407.	Nobuyuki Asai, Masahide Hojo and Tokuo Ohnishi : Uninterruptible Ripple Free PFC Rectifier with High-Voltage Capacitor, Proceedings of the Japan Industry Applications Society Conference, Vol.2, No.Y-63, 1085, Aug. 2002.
408.	Masato Ohgata, Masahide Hojo and Tokuo Ohnishi : High Efficiency Induction Motor Pump Drive System by Using Solar Cell, Proceedings of the Japan Industry Applications Society Conference, Vol.2, No.Y-61, 1083, Aug. 2002.
409.	Noriaki Miyoshi, Masahide Hojo and Tokuo Ohnishi : The Maximum Power Control for Linear/Non-linear DC Power Supply, Proceedings of the Japan Industry Applications Society Conference, Vol.2, No.Y-60, 1082, Aug. 2002.
410.	Masahide Hojo and Tokuo Ohnishi : Single-Phase Power Line Harmonics Compensator with Current Limitation, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.155, 607-608, Aug. 2002.
411.	Kazuhiro Hara, Masahide Hojo and Tokuo Ohnishi : Experiment Characteristics of Three-Phase Power Line Compensator in Series with Transformers, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.71, 357-358, Aug. 2002.
412.	Tadao Nagase, Masahide Hojo and Tokuo Ohnishi : Three Phase PWM Rectifier Circuit by Sinusoidal Voltage Interaction, Proceedings of the Japan Industry Applications Society Conference, Vol.1, No.59, 329-330, Aug. 2002.
413.	Takuhei Hashiguchi, Masamichi Yoshimoto, Yasunori Mitani, Osamu Saeki, Kiichiro Tsuji, Hiroyuki Ukai and Masahide Hojo : Observation system of dynamics in the west Japan 60Hz system by the use of time synchronizing phasor measuring technology, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.A, No.252, 717-718, Aug. 2002.
414.	Masahide Hojo, Tokuo Ohnishi, Yasunori Mitani, Osamu Saeki and Hiroyuki Ukai : Observation of Frequency Oscillation Characteristics Using Time Synchronized Measurements, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.A, No.253, 719-720, Aug. 2002.
415.	Tokuo Ohnishi and Masahide Hojo : Three-Phase Power Line Harmonics Compensator with Adjustable Compensation Control Based on Allowable Current, National Convention Record I.E.E. Japan, Vol.4, No.162, 265, Mar. 2002.
416.	Kazuhiro Hara, Tokuo Ohnishi, Masahide Hojo and Akira Takagi : Capacity Reduction of Three-Phase Power Line Harmonics Compensator of Series Transformer, National Convention Record I.E.E. Japan, Vol.4, No.163, 266, Mar. 2002.
417.	Tadao Nagase, Masahide Hojo and Tokuo Ohnishi : Three-Phase PWM Controlled Unity Power Supply Compensator for Distorted Line Voltage Source, National Convention Record I.E.E. Japan, Vol.4, No.164, 267, Mar. 2002.
418.	Kazumi Ogose, Masahide Hojo and Tokuo Ohnishi : Time Sharing MPPT Control Method for Photovoltaic Solar Power Conversion Circuit, National Convention Record I.E.E. Japan, Vol.4, No.049, 72, Mar. 2002.
419.	Masamichi Yoshimoto, Yasunori Mitani, Kiichiro Tsuji, Masahide Hojo, Tokuo Ohnishi and Takuhei Hashiguchi : Observation of West Japan 60Hz System Oscillation Characteristic Using Time Synchronizing Measuring Technology, National Convention Record I.E.E. Japan, Vol.6, No.008, 13-14, Mar. 2002.
420.	Masahide Hojo, Tokuo Ohnishi, Yasunori Mitani and Kiichiro Tsuji : Studies on Control Strategies of Series Connected Converter for Fault Current Limiting, National Convention Record I.E.E. Japan, Vol.6, No.211, 348, Mar. 2002.
421.	Masahide Hojo, Tokuo Ohnishi, Duangkamol Kamolyabutra, Yasunori Mitani and Kiichiro Tsuji : Current Limiting Control by Series Connected FACTS Controller, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-21, 88, Sep. 2001.
422.	Kentaro Sakai, Masahide Hojo and Tokuo Ohnishi : Experimental Characteristics of 3 Level PWM Inverter with Series Capacitor Configuration, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-20, 87, Sep. 2001.
423.	Akira Takagi, Masahide Hojo and Tokuo Ohnishi : Capacity Reduction of Three-Phase Power Line Harmonics Compensator, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-19, 86, Sep. 2001.
424.	Kazuhiro Hara, Masahide Hojo and Tokuo Ohnishi : Control Characteristics of Single-Phase Line Voltage Harmonics Compensator for Load Variation, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-18, 85, Sep. 2001.
425.	Tadao Nagase, Masahide Hojo and Tokuo Ohnishi : Three-Phase PWM Converter with Unity Power Factor for Distorted Line Voltage Source, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-17, 84, Sep. 2001.
426.	Tokuo Ohnishi and Masahide Hojo : Instantaneous Voltage Drop Compensation for PFC Converter with Double Layer-Capacitor, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-16, 83, Sep. 2001.
427.	Yuuichi Takaide, Masahide Hojo and Tokuo Ohnishi : Operating Characteristics of 5 Level Single-Phase PWM Controlled Utility Interactive Inverter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-13, 80, Sep. 2001.
428.	Toshihiro Kujime, Masahide Hojo and Tokuo Ohnishi : Harmonics Compensation Method of Utility Interactive Amplitude Modulation Inverter, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-12, 79, Sep. 2001.
429.	Kazumi Ogose, Masahide Hojo and Tokuo Ohnishi : Time Sharing MPPT Control Method for Photovoltaic Power Generation System, Journal of Shikoku-Section Joint Convention of the Institutes of Electrical and Related Engineers, No.5-11, 78, Sep. 2001.
430.	Tokuo Ohnishi and Masahide Hojo : DC Voltage Sensor Less Single Phase PFC Converter, Proceedings of the Japan Industry Applications Society Conference, Vol.2, No.159, 781-782, Aug. 2001.
431.	Kazuhiro Hara, Masahide Hojo and Tokuo Ohnishi : Capacity Reduction of Harmonics Compensator for Single-Phase Power Line, Proceedings of the Japan Industry Applications Society Conference, Vol.2, No.Y-91, 1057, Aug. 2001.
432.	Tadao Nagase, Masahide Hojo and Tokuo Ohnishi : A Control Strategy of Three Phase PWM Converter for Distored Line Voltage, Proceedings of the Japan Industry Applications Society Conference, Vol.2, No.Y-76, 1026, Aug. 2001.
433.	Yuichi Takaide, Masahide Hojo and Tokuo Ohnishi : PWM Control Characteristics of Single-Phase 5 Level Inverter, Proceedings of the Japan Industry Applications Society Conference, Vol.2, No.Y-70, 1036, Aug. 2001.
434.	Kazumi Ogose, Masahide Hojo and Tokuo Ohnishi : MPPT Control Method of Photovoltaic Power Generation System with Different Solar Cell Panel Characteristics, Proceedings of the Japan Industry Applications Society Conference, Vol.2, No.Y-60, 1026, Aug. 2001.
435.	Masahide Hojo, Tokuo Ohnishi, Duangkamol Kamolyabutra, Yasunori Mitani and Kiichiro Tsuji : Current Limiting Control by Series Connected Power System Controller, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.A, No.115, 433-434, Aug. 2001.
436.	Kentaro Sakai, Masahide Hojo and Tokuo Ohnishi : Three-Phase Power Line Compensator by Using 4 Level Inverter with Series Capacitor, National Convention Record I.E.E. Japan, Vol.4, No.160, 1460, Mar. 2001.
437.	Tokuo Ohnishi and Masahide Hojo : PWM Switching Control Method for Series Variable Capacitor, National Convention Record I.E.E. Japan, Vol.4, No.095, 1344, Mar. 2001.
438.	Toshihiro Kujime, Wekesa Cyrus, Masahide Hojo and Tokuo Ohnishi : Sinusoidal Voltage Interconnected Solar Power Generation System, National Convention Record I.E.E. Japan, Vol.4, No.070, 1309, Mar. 2001.
439.	Kennichi Yamada, Masahide Hojo and Tokuo Ohnishi : Induction Motor Pump Drive Inverter System Supplied by Solar Cell, National Convention Record I.E.E. Japan, Vol.4, No.069, 1308, Mar. 2001.
440.	Kamolyabutra Duangkamol, Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : 移相器を付加したSMES(SuperSMES)による電力系統安定化制御実験, 電気関係学会関西支部連合大会講演論文集, No.G5-25, Sep. 1998.
441.	Masahide Hojo, Yasunori Mitani, Junnichi Ishii, Toshifumi Ise and Kiichiro Tsuji : Formulation and Evaluation of Control Region of Phase Shifter for Generator Control, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, Vol.A, No.24, 147-152, Aug. 1998.
442.	Kamolyabutra Duangkamol, Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : Evaluation on Power System Stabilizing Control by SuperSMES Using Local Signals, National Convention Record I.E.E. Japan, Vol.6, No.1432, 272-273, Mar. 1998.
443.	Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : 移相器を用いた発電機電力直接制御による過渡安定度向上効果の評価, National Convention Record I.E.E. Japan, Vol.6, No.1421, Mar. 1998.
444.	Kamolyabutra Duangkamol, Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : 局地情報を用いて構成したSuperSMESによる系統安定化制御, 電気関係学会関西支部連合大会講演論文集, No.G5-14, Sep. 1997.
445.	Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : 高速移相器とAVRの協調制御による系統安定化, 電気関係学会関西支部連合大会講演論文集, No.G5-15, Sep. 1997.
446.	Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : 高速移相器を用いた発電機電力直接制御によるロバスト系統安定化, Proceedings of the Annual Conference of Power & Energy Society, IEE of Japan, No.158, Aug. 1997.
447.	Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : Application of the State-Space Exact Linearization to Power System Stabilization by a Superconducting Power System Controller, National Convention Record I.E.E. Japan, Vol.6, No.1523, 274-275, Mar. 1997.
448.	Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : Application of State-Space Exact Linearization to Power System Stabilization, Proceedings of Annual Conference of the Institute of Systems, Control and Information Engineers, 95-96, Mar. 1997.

Et cetera, Workshop:

1.	Teppei Taruya and Masahide Hojo : HVDC-Tapを適用した他励式直流送電システムの電力分岐特性, The Papers of Technical Meeting, IEE JAPAN, Sep. 2023.
2.	Jin Koshizawa and Masahide Hojo : GFM制御を搭載した多端子直流送電システムによる系統間電力融通の基礎検討, The Papers of Technical Meeting, IEE JAPAN, Sep. 2023.
3.	Kyoka U and Masahide Hojo : マイクログリッドにおける位相制御を用いたGFMとGFLの並列運転時の挙動解析, The Papers of Technical Meeting, IEE JAPAN, Sep. 2023.
4.	Masaya Ozaki, Masahide Hojo, Ryo Maeda and Ryohei Koizumi : 配電系統におけるブロックチェーンを活用した電圧制御の動作検証, The Papers of Technical Meeting, IEE JAPAN, Sep. 2023.
5.	Kaito Yasumochi, Masahide Hojo and Kenji Yamanaka : A Study on Load Configuration of Multi-Terminal DC Power Transmission System, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-20(HCA-20, VT-20), No.178(71,67), 155-157, Sep. 2020.
6.	Hiroki Yoshimoto, Kenji Yamanaka and Masahide Hojo : Triple-Switch Cell Voltage Balancing Circuit with Coupling Capacitor for Storage Cells, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-20(HCA-20, VT-20), No.139(32,28), 37-40, Sep. 2020.
7.	Hibiki Iruya, Kenji Yamanaka and Masahide Hojo : Evaluation of Misalignment for Contactless Power Transfer System Using Magnetic Core, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-20(HCA-20, VT-20), No.135(28,24), 23-25, Sep. 2020.
8.	砂山長三郎, Naoyuki Shimomura, Masahide Hojo, 尾崎勝, 出川通, 余喜多博 and 荒川文生 : でんきの礎における「エレキテルと平賀源内」顕彰の意義と展望, 電気学会電気技術史研究会資料, No.HEE-19-1, 1-4, Jan. 2019.
9.	Shinichi Hiroshige, Kenji Yamanaka and Masahide Hojo : Technical Education of Power Electronics by Student Lecturers - The effect of teaching others -, The Papers of Technical Meeting, IEE JAPAN, Vol.FIE-18, No.028, Dec. 2018.
10.	Shinichi Hiroshige, Kenji Yamanaka and Masahide Hojo : Technical Education of Power Electronics including Experiment of Converter Circuit and Research of Education Effect, The Papers of Technical Meeting, IEE JAPAN, Vol.FIE-18, No.008, Mar. 2018.
11.	Kouichiro Kouno, Tsuyoshi Sogabe, Katsushi Itou, Tadao Nagase and Masahide Hojo : 長距離配電線における大規模太陽光発電の無効電力制御による電圧変動抑制の実証試験, The Papers of Technical Meeting, IEE JAPAN, Sep. 2016.
12.	Koki Aida, Masahide Hojo, Kenji Yamanaka, Yoshinobu Ueda and Toshihisa Funabashi : Enhancement of Synchronizing Torque by Self-commutated Power Converter for Distributed Energy Resources, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-16(PSE-16,SPC-16), No.36(56,75), 95-99, Mar. 2016.
13.	Masahide Hojo, Ryo Ikeshita, Kenji Yamanaka, Yoshinobu Ueda and Toshihisa Funabashi : Frequency Regulation in a Microgrid by Voltage Phasor Regulation of a Photovoltaic Generation Unit, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-15(PSE-15), No.002(024), 1-5, Mar. 2015.
14.	Jun Ding and Masahide Hojo : Stability and Fault Position Analysis of Grid with Wind Power Integration, The Papers of Technical Meeting, IEE JAPAN, Vol.PPR-14, No.012, 59-62, Jan. 2014. (Keyword) wind power / stability / critical clearing time / fault position / distance protection (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1520572359778120064 (CiNii: 1520572359778120064)
15.	神原拓己, Kenji Yamanaka and Masahide Hojo : IGBTを用いた高速スイッチング回路の提案, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-14(MD-14), No.018(018), Jan. 2014. (Summary) IGBTは高耐圧，大電流に適しているため様々な所で用いられている．しかし，スイッチング周波数の上限が数十kHz程度であるため小型化に限界があった．本研究ではIGBTを用いた高速スイッチング動作についての検証を行う．本稿ではIGBTの動作に注目して，高速スイッチングに有効な駆動方法とその回路を提案する．デッドタイムに注目したスイッチングを行い，その結果期待できる効果が得られたので報告する．
16.	住吉隼, Kenji Yamanaka and Masahide Hojo : オルタネータを用いたエンジンアシストによるハイブリッド化の検討, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-14(MD-14), No.017(017), Jan. 2014. (Summary) 自動車の低燃費思考の高まりからハイブリッド車の普及が進んでいる．エンジンに取り付けられている発電機であるオルタネータを電動機として使用し，エンジンの効率が悪い低速トルク部分を電動機でアシストすることにより低燃費化を図る．本稿では既存のオルタネータを用いたハイブリッド化の制御システムを提案するとともに，オルタネータを電動機として駆動した時の運転特性について報告する．
17.	小松誉宙, Kenji Yamanaka and Masahide Hojo : 120度通電方式を用いたモータドライブ法の実験検討, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-14(MD-14), No.011(011), Jan. 2014. (Summary) 同期電動機の高速化が進むにつれ，スイッチング損失等の効率面から矩形波駆動を用いたモータドライブ法の研究がされている．しかし矩形波駆動である120度通電方式は減速時における速度応答性が問題として挙げられている．そこで本稿では高速回転する同期電動機に適した120度通電方式に，回生機能を付加することで減速時における応答性の改善を目指し，その実験結果について報告する．
18.	河野高一郎, 中西英治, 永野賢朗 and Masahide Hojo : メガソーラー発電システムの無効電力制御による電圧変動抑制の検討, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-13(PSE-13), No.134(150), Sep. 2013. (Summary) 配電系統におけるメガソーラー連系時の電圧変動対策として，PCSの力率一定制御が導入されているが，同制御は長距離配電線において電圧変動が増大する問題がある．そこで，メガソーラーの出力・配電線負荷の変化にあわせてPCSの力率を変更する新たな無効電力制御を提案した．シミュレーションによる検討の結果，力率一定制御と比較して大幅に電圧変動が抑制され，長距離配電線において適用できる可能性があることがわかった．
19.	Masahide Hojo, Ryo Ikeshita, Yoshinobu Ueda and Toshihisa Funabashi : 分散電源用系統連系インバータの電圧位相調整による周波数制御, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-13(PSE-13), No.164(180), Sep. 2013. (Summary) 分散電源の導入拡大に伴って，従来方式の位相同期形インバータの多数台連系よる同期化力の低下が懸念されている．これに対し，変換器の高い制御性を逆に利用して仮想同期発電機を実現する方法が注目されており，制約の厳しい変換器容量に配慮して応用すれば有効な方法であると考えられる．本稿では同期化力向上につながる有効電力授受の機能を実現する出力電圧位相制御を提案し，その周波数制御における制御効果について論じる．
20.	Masahide Hojo, Ryo Ikeshita, Yoshinobu Ueda and Toshihisa Funabashi : Effectiveness of a Self-Commutated Power Converter Emulating a Synchronous Machine, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-11, No.183, 7-10, Dec. 2011. (Summary) 半導体電力変換器が電力系統に多数台連系されることに伴う同期化力の低下が懸念されている．変換器の制御によって仮想同期発電機を実現する方法は，同期化力の低下を防ぐ一つの方法として期待されている．本稿ではこうした変換器制御の制御法について検討を行うと共に，その制御効果を明らかにし，かつ制御のために必要な余剰容量について評価を行う．
21.	Tomohiro Arita and Masahide Hojo : Investigation of a Distribution Line Voltage Control by Photovoltaic Generation Systems with a Series Reactor, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-11(PSE-11), No.150(167), 79-83, Sep. 2011. (Summary) 筆者らは太陽光発電システムに用いられている系統連系インバータの無効電力制御を積極的に行うことにより，配電系統の電圧制御を行う方法を検討してきた．しかしながら，無効電力制御の効果は配電線のインダクタンスに依存するため，現状の配電系統ではその効果に限界がある．本研究では，配電線に直列にリアクトルを追加した際の無効電力制御の効果の増大を明白にし，直列リアクトルの挿入効果についての評価・検討を行っている．
22.	Masahide Hojo and Yuji Mishima : An Installation Strategy of Photovoltaic Generation to Tram System, The Papers of Technical Meeting, IEE JAPAN, Vol.TER-10(ITS-10), No.67 (58), 83-86, Nov. 2010. (Summary) 本研究では，住宅密集地における太陽光発電の大量導入の一つの方法として，電車運転時の電圧変動吸収機能を持たせたDCチョッパを介して都市交通システムに給電する方法を提案する．これにより，多数台系統連系インバータに関する問題回避とコスト低減のみならず，太陽電池出力から負荷までの変換段数削減と発電電力の地産地消による低損失化が期待できる．本稿では，シミュレーションにより基礎検討を行った結果を述べる． (Keyword) photovoltaic generation system
23.	Masahide Hojo and Kazuyuki Minato : Power Conversion for DC Power Network by Flying Capacitor Multilevel Converter, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-10(PSE-10), No.2 (46), 7-11, Feb. 2010. (Summary) 筆者らは，太陽電池のような直流電源から負荷にいたる変換段数の削減によって効率の向上を目指し，異電圧レベルの直流電圧端子を複数有するフライングキャパシタ形マルチレベルインバータを応用した電力変換回路を提案している．本稿では，この変換回路の基本動作原理について述べた上で，分散電源による独立型直流給配電システムについて，簡単なモデルを基にシミュレーション解析により動作検証を行った結果について述べる．
24.	Masahide Hojo, Keiichi Abe, Yasunori Mitani, Hiroyuki Ukai and Osamu Saeki : Online Power System Monitoring by Synchronized Voltage Phasor Measurement at Demand Sides, The Papers of Technical Meeting, IEE JAPAN, Vol.PSE-10, No.4, 19-23, Jan. 2010. (Summary) 著者ら及び共同研究者は，中西系統に属する複数の大学に電圧位相計測装置を設置し，広域位相計測を継続している．本計測システムは需要家端で計測を行うことが特徴で，計測生データを2地点間位相差-周波数偏差平面にオンラインでプロットしながら，その中に形成される群の挙動を観察することで，データエラーの影響を受けにくい簡便な観測システムを構成できる．本稿では，複数の実測例に基づき，その有用性の検討を行う．
25.	Yosuke Nishio, Kiyohiro Tsuboi, Yutaka Ota, Hiroyuki Ukai, Masahide Hojo, Osamu Saeki, Masayuki Watanabe, Yasunori Mitani and Mutsumi Aoki : Power System Disturbances Detection by Campus PMU/WAMS, The Papers of Technical Meeting, IEE JAPAN, Vol.PSE-09, No.7, 41-46, Jan. 2009.
26.	Yasunori Mitani, Takumi Kageyama, Changsong Li, Masayuki Watanabe, Hiroyuki Ukai, Osamu Saeki and Masahide Hojo : Long Term Observation Results of Power System Dynamics by Using Campus WAMS, The Papers of Technical Meeting, IEE JAPAN, Vol.PSE-09, No.5, 25-30, Jan. 2009.
27.	Masahide Hojo, Yuta Iwase, Kota Amo, Yoshinobu Ueda and Toshihisa Funabashi : A Control Method of Three-Phase Inverter for Power Quality Improvement in Microgrid, The Papers of Technical Meeting, IEE JAPAN, Vol.PSE-09, No.8, 47-52, Jan. 2009.
28.	Masahide Hojo and Yasunori Mitani : Power System Stabilization with Power Swing Linearization by SSSC Based on Synchronized Phasor Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-08, No.170, 25-29, Dec. 2008.
29.	Masahide Hojo and Kazuyuki Minato : Basic Study on a DC Power Network by a Flying Capacitor Multilevel Inverter, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-08, No.161, 25-28, Nov. 2008.
30.	Naoyuki Shimomura, Ikuro Morita, Takashi Yasuno, Masahide Hojo, Masatake Kawada, Kenji Teranishi and Tokuo Ohnishi : An Approach on Electrical Electronic Engineering Laboratory, --- Things to Appear from Small-Group Instruction ---, The Papers of Technical Meeting, IEE JAPAN, Vol.FIE-08, No.2, 11-15, Sep. 2008.
31.	Masahide Hojo, Yasunori Mitani, Hiroyuki Ukai and Osamu Saeki : Investigation of Statistical Quantities by Multiple Synchronized Phasor Measurement, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-08(PSE-08), No.76(85), 65-69, Aug. 2008.
32.	Noriyuki Sato, Takuhei Hashiguchi, Tadahiro Goda, Yasunori Mitani, Masayuki Watanabe, Osamu Saeki, Masahide Hojo and Hiroyuki Ukai : Verification of Construction Method for Center of Inertia by Using Multiple Synchronized Phasor Measurement Data, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-08(PSE-08), No.75(84), 59-64, Aug. 2008.
33.	Osamu Saeki, Yasunori Mitani, Masayuki Watanabe, Masahide Hojo and Hiroyuki Ukai : Improvement of Data Retrieval and Distribution System for Synchronized Phasor Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-08(PSE-08), No.73(82), 49-53, Aug. 2008.
34.	Shigekazu Sakai, Yasuhiro Hayashi, Shoji Kawasaki, Junya Matsuki, Jumpei Baba, Akihiko Yokoyama, Masahide Hojo, Shinji Wakao, Kenjiro Mori and Yoshiaki Fuwa : Verification Experiment of Active Coordinated Operation of Distributed Generators and Distribution Network by ANSWER, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-08(PSE-08), No.21(30), 1-6, Aug. 2008.
35.	Yutaka Ota, 川口剛季, 坪井清浩, Hiroyuki Ukai, Masayuki Watanabe, Yasunori Mitani, Masahide Hojo and Osamu Saeki : Operational Results of Synchronized Phasor Measurement System, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-07(PSE-07), No.53(68), 63-67, Aug. 2007.
36.	Masahide Hojo, Yasunori Mitani, Hiroyuki Ukai and Osamu Saeki : Statistical Studies on Relations between Frequency and Phase Difference for Analyzing Power System Using Synchronized Phasor Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-07(PSE-07), No.51(66), 53-57, Aug. 2007.
37.	Shoji Kawasaki, Yasuhiro Hayashi, Junya Matsuki, Hirotaka Kikuya and Masahide Hojo : Study on Optimal Allocation and Gain of Active Filter for Distribution Network with Distributed Generation, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-07(PSE-07), No.33(48), 25-30, Jul. 2007.
38.	Shigekazu Sakai, Yasuhiro Hayashi, Shoji Kawasaki, Junya Matsuki, Jumpei Baba, Akihiko Yokoyama, Masahide Hojo, Shinji Wakao, Naoki Kobayashi and Kohei Oishi : Verification of Active Coordinated Operation of Distributed Generators and Distribution Network by Distribution Network Equipment, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-07(PSE-07), No.31(46), 13-18, Jul. 2007.
39.	Tokuo Ohnishi, Kenji Yamanaka, Hiroyuki Hayashi and Masahide Hojo : Electric Vehicle (EV) driven by An Induction Motor using Proposed Speed Sensor-less Control Methods, The Papers of Technical Meeting, IEE JAPAN, Vol.VT-07, No.03, 13-19, Apr. 2007.
40.	Toshiya Yamada, Tokuo Ohnishi and Masahide Hojo : Autonomous Power Supply System Using Grid Voltage Sensorless Controlled Three-Phase PWM Inverter, The Papers of Technical Meeting, IEE JAPAN, Vol.PE(PSE, SPC)-07, No.14(29,54), 45-50, Mar. 2007.
41.	Yasuhiro Hayashi, Shoji Kawasaki, Junya Matsuki, Shigekazu Sakai, Tomohiro Nomura, Jumpei Baba, Akihiko Yokoyama, Masahide Hojo, Shinji Wakao, Naoki Kobayashi and Kohei Oishi : Verification of Active Coordinated Operation of Distributed Generators and Distribution System by Distribution System Equipment, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-07(PSE-07, SPC-07), No.3(18,43), 11-20, Mar. 2007.
42.	Yusuke Morimoto, Tokuo Ohnishi and Masahide Hojo : Control Characteristics of Line Current Detection Type Three-phase Active Filter, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-07, No.26, 31-36, Jan. 2007.
43.	Tomoharu Fujii, Tokuo Ohnishi and Masahide Hojo : Compact Stabilized AC Power Supply by Using Series Inverter, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-07, No.23, 13-17, Jan. 2007.
44.	Masashi Ogura, Tokuo Ohnishi and Masahide Hojo : Three-Phase Rectifier Circuit by Multilevel Current Waveform Control, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-07, No.10, 57-61, Jan. 2007.
45.	Tokuo Ohnishi, Yamanaka Kenji and Masahide Hojo : Speed Sensorless General Vector Control for Induction Motor Drive, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-06(IEA-06), No.150(45), 21-26, Nov. 2006.
46.	Akira Izume, Masahide Hojo, Tokuo Ohnishi, Shoji Taki, Kohei Oishi and Nobuyuki Fujiwara : Suppression Method of Voltage Rise by Reactive Power Compensation of Many Utility Interactive Inverters for Photovoltaic Generation System, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-06(PSE-06), No.103(103), 35-40, Aug. 2006.
47.	Satoshi Yamada, Osamu Saeki, Kiichiro Tsuji, Yasunori Mitani, Masayuki Watanabe, Hiroyuki Ukai, Takuhei Hashiguchi and Masahide Hojo : Examination of Indicators for Identifying Power System Faults Based on Multiple Synchronized Phasor Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-06(PSE-06), No.48(48), 21-26, Aug. 2006.
48.	Shigekazu Sakai, Yasuhiro Hayashi, Junya Matsuki, Shoji Kawasaki, Tomohiro Nomura, Jumpei Baba, Akihiko Yokoyama, Masahide Hojo, Shinji Wakao, Naoki Kobayashi and Kohei Oishi : Experiment of Acceptable Maximum Output of Distributed Generator with Distribution System Experiment Equipment, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-06(PSE-06), No.86(86), 7-11, Aug. 2006.
49.	Yusuke Shima, Tokuo Ohnishi, Masahide Hojo and Akihiko Iwata : AC Power Supply by Combination Controlled Multilevel Sinusoidal Wave Inverter, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-06, No.30, 37-42, Jan. 2006. (Keyword) combination control / multilevel inverter
50.	Masahide Hojo and Tokuo Ohnishi : A Loop Power Flow Controller by Series-Connected Inverter without Increasing Short Circuit Capacity, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-06(PSE-06, SPC-06), No.5, 25-29, Jan. 2006.
51.	Kensuke Kaneda, Masahide Hojo and Tokuo Ohnishi : Experimental Verification of Harmonics Compensation by a Series and a Parallel Active Filter, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-06, No.14, 7-11, Jan. 2006.
52.	Yoshinori Ito, Tokuo Ohnishi and Masahide Hojo : Improvement of Power Distribution Line Quality by Using Grid Connecting Inverter, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-06, No.15, 13-18, Jan. 2006.
53.	Yamanaka Kenji, Tokuo Ohnishi and Masahide Hojo : Position Sensorless Current Vector Control Method of Permanent Magnet Synchronous Motor, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-05(IEA-05), No.103(55), 25-29, Nov. 2005.
54.	Masahide Hojo and Tokuo Ohnishi : A Study on Harmonic Mitigation Methods Utilizing Rated Capacity of Inverters for Photovoltaic Array Interconnection, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-05(PSE-05), No.132(139), 23-28, Sep. 2005.
55.	Takuhei Hashiguchi, Yutaka Ota, Hiroyuki Ukai, Yasunori Mitani, Osamu Saeki and Masahide Hojo : Parameter Estimation of Power System Oscillations Based on Multiple Synchronized Phasor Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-05(PSE-05), No.13(20), 13-18, Sep. 2005.
56.	Yamanaka Kenji, Masahide Hojo and Tokuo Ohnishi : Brushless DC Motor Control System by Hall-effect Element Signal Multiply Method, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-04(IEA-04), No.141(59), 29-33, Nov. 2004.
57.	Norihito Kuroe, Masahide Hojo and Tokuo Ohnishi : Experimental Verification of the Effect of Fault Current Limiter Using Voltage Source Inverter, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-04(PSE-04), No.71(71), 17-22, Sep. 2004.
58.	Yutaka Ohta, Hiroyuki Ukai, Koichi Nakamura, Yasunori Mitani, Masahide Hojo and Osamu Saeki : Detection Method of Power Oscillation Mode from Synchronized Phasor Measurements by PMU, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-04(PSE-04), No.48(48), 37-40, Sep. 2004.
59.	Takuhei Hashiguchi, Osamu Saeki, Kiichiro Tsuji, Yasunori Mitani, Masahide Hojo, Hiroyuki Ukai and Daisaku Sato : Estimation of Generator Oscillation Characteristics Based on Multiple Synchronized Phasor Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-04(PSE-04), No.27(27), 7-12, Sep. 2004.
60.	Akihiro Matsushita, Yasunori Mitani, Osamu Saeki, Masahide Hojo and Hiroyuki Ukai : Analysis of the Inter-area Oscillation Characteristic in Japan Western 60 Hz Power System Using Synchronized Phasor Measurements Technology, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-04(PSE-04), No.29(29), 19-24, Sep. 2004.
61.	Megumi Katayama, Yasunori Mitani, Osamu Saeki, Masahide Hojo and Hiroyuki Ukai : Analysis of Variation of Phase by Synchronized Phasor Measurement, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-04(PSE-04), No.26(26), 1-6, Sep. 2004.
62.	Kazuya Ohnishi, Masahide Hojo, Tokuo Ohnishi, Yasunori Mitani, Osamu Saeki and Hiroyuki Ukai : Studies on Frequency Variation Characteristics Based on Multiple Synchronized Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-04(PSE-04), No.28(28), 13-18, Sep. 2004.
63.	Masahide Hojo, Norihito Kuroe and Tokuo Ohnishi : Studies on Multi-Functional Fault Current Limiter by Voltage Source Inverter, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-04, No.11, 61-66, Jan. 2004.
64.	Kenichiro Ueki, Masahide Hojo and Tokuo Ohnishi : Harmonics Compensator by Equivalent Resistive Load Control, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-04, No.7, 37-41, Jan. 2004.
65.	Tokuo Ohnishi, Kenichiro Ueki and Masahide Hojo : Control Characteristics of An Active Filter by means of Source Current Detection Control, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-03, No.142, 51-56, Nov. 2003.
66.	Masanori Kawakita, Yutaka Ohta, Hiroyuki Ukai, Koichi Nakamura, Yasunori Mitani, Osamu Saeki and Masahide Hojo : Analysis for Power System Oscillation based on Synchronized Phasor Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-03(PSE-03), No.72(83), 29-34, Sep. 2003.
67.	Takuhei Hashiguchi, Masamichi Yoshimoto, Osamu Saeki, Kiichiro Tsuji, Yasunori Mitani, Hiroyuki Ukai and Masahide Hojo : Identification of Characterization Factor for Power System Oscillation Based on Multiple Synchronized Phasor Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-03(PSE-03), No.71(82), 23-28, Sep. 2003.
68.	Masamichi Yoshimoto, Takuhei Hashiguchi, Osamu Saeki, Kiichiro Tsuji, Yasunori Mitani, Hiroyuki Ukai and Masahide Hojo : Analysis of Local Phase-Angle Oscillation Characteristic Based on Multiple Synchronized Phasor Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-03(PSE-03), No.70(81), 17-22, Sep. 2003.
69.	Masahide Hojo, Tokuo Ohnishi, Yasunori Mitani, Osamu Saeki and Hiroyuki Ukai : Studies Based on Analysis of Frequency Variation Characteristics Using Multiple Synchronized Phasor Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-03(PSE-03), No.69(80), 11-16, Sep. 2003.
70.	Yutaka Ota, Hiroyuki Ukai, Koichi Nakamura, Yasunori Mitani, Osamu Saeki and Masahide Hojo : Evaluation of Oscillatory Characteristics of Japanese 60Hz Systems by Using Synchronized Phasor Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-02(PSE-02), No.63(73), 19-23, Sep. 2002.
71.	Masamichi Yoshimoto, Takuhei Hashiguchi, Yasunori Mitani, Osamu Saeki, Kiichiro Tsuji, Hiroyuki Ukai and Masahide Hojo : Identification of System Parameters by Observation of Oscillation in Japan Western 60 Hz Power System Based on Multiple Synchronized Phasor Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-02(PSE-02), No.64(74), 25-30, Sep. 2002.
72.	Takuhei Hashiguchi, Masamichi Yoshimoto, Yasunori Mitani, Osamu Saeki, Kiichiro Tsuji, Hiroyuki Ukai and Masahide Hojo : Analysis of Local Oscillation Characteristics for Japan Western 60Hz Power System Based on Multiple Synchronized Phasor Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-02(PSE-02), No.62(72), 13-18, Sep. 2002.
73.	Masahide Hojo, Tokuo Ohnishi, Yasunori Mitani, Osamu Saeki and Hiroyuki Ukai : Observation of Frequency Oscillation in Japan Western 60 Hz Power System Using Time Synchronized Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-02(PSE-02), No.61(71), 7-12, Sep. 2002.
74.	Yasunori Mitani, Osamu Saeki, Masahide Hojo and Hiroyuki Ukai : Online Monitoring System for Japan Western 60 Hz Power System Based on Multiple Synchronized Phasor Measurements, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-02(PSE-02), No.60(70), 1-6, Sep. 2002.
75.	Masahide Hojo and Tokuo Ohnishi : Application of Static Synchronous Series Compensator (SSSC) to Fault Current Limiter, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-02, 29-34, Feb. 2002.
76.	Tokuo Ohnishi and Masahide Hojo : Single Phase PFC Converter Constructed by AC Line Voltage Waveform Detection, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-02, 7-11, Feb. 2002.
77.	Masahide Hojo, Tokuo Ohnishi, Kamolyabutra Duangkamol, Yasunori Mitani and Kiichiro Tsuji : Configuration of Series-Connected Power System Controller with Current Limiting, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-01(PSE-01), 61-66, Oct. 2001.
78.	Tokuo Ohnishi, Masahide Hojo and Akira Takagi : Reducing Capacity of Three-Phase Power Line Harmonics Compensator, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-01, 31-36, Jan. 2001.
79.	Masahide Hojo and Tokuo Ohnishi : Control Characteristics of SVG with Three-level PWM Inverter Constructed by Series Capacitors, The Papers of Technical Meeting, IEE JAPAN, Vol.SPC-00, 13-18, Jan. 2000.
80.	Masahide Hojo, Duangkamol Kamolyabutra, Yasunori Mitani, Toshifumi Ise and Kiichiro Tsuji : Experimental Study on Power System Stabilization by Phase Shifter with Linearizing Control of Power Swing, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-98(PSE-98), 63-68, Oct. 1998.
81.	Duangkamol Kamolyabutra, Masahide Hojo, Yasunori Mitani, Toshifumi Ise and Kiichiro Tsuji : 局地情報を用いて構成したSuperSMESによる系統安定化実験, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-98(PSE-98), 27-32, Oct. 1998.
82.	Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : Power System Stabilization based on Direct Generator Power Control, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-97(PSE-97), 31-36, Oct. 1997.
83.	Masahide Hojo, Yasunori Mitani and Kiichiro Tsuji : Control System Design of Variable Series Impedance Based on State-Space Exact Linearization for Power System Stabilization, The Papers of Technical Meeting, IEE JAPAN, Vol.PE-96(PSE-96), 51-60, Sep. 1996.

Report:

1.	Yoshihiko Ueno, Maiko Sawada, Tatsuro Aratake, Ichiro Hashimoto, Takeshi Nikawa, Toshiyuki Yasui, Kenichi Hamada, Yasuhiko Shirayama, Ken-ichi Yamada, Masahide Hojo, Takeshige Otoi, Ray S. Furuya and Yosuke Seki : 平成29年度徳島大学総合教育センターアドミッション部門報告書, 平成29年度徳島大学総合教育センターアドミッション部門報告書, Mar. 2018.

Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)

Power System Stabilization by Self-Commutated Power Converter Control under High Penetration of Distributed Energy Resources (Project/Area Number: 25420258 )
Distributed Autonomous Observation System for Transaction of Electric Energy (Project/Area Number: 18206028 )
限流機能を有する多機能型電力系統制御装置の開発 (Project/Area Number: 16760229 )
Photovoltaic Power Generation System with Improvement of Quality of Utility Interconnected Line (Project/Area Number: 15560245 )
Online Identification of Wide Area Power System Dynamics by Using Multiple Synchronized Phaser Measurements (Project/Area Number: 14350145 )
Search by Researcher Number (10314840)

Professor : Hojo, Masahide

Research

Personal Web Page

Field of Study

Subject of Study

Book / Paper

Academic Paper (Judged Full Paper):

Review, Commentary:

Proceeding of International Conference:

Proceeding of Domestic Conference:

Et cetera, Workshop:

Report:

Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)