Organization
School of Engineering Visiting Professor
Title
Visiting Professor
External link
HAGIWARA MAKOTO
Degree
-
Doctor of Engineering ( 2006.3 Tokyo Institute of Technology )
Research Interests
-
Electrical machine
-
Electric power system
-
パワーエレクトロニクス
-
Power Electronics
Research Areas
-
Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Power engineering
Education
-
Tokyo Institute of Technology Graduate school of engineering Department of electrical engineering
2003.4 - 2006.3
-
Tokyo Institute of Technology
2001.4 - 2003.3
Country： Japan
-
Tokyo Institute of Technology
1997.4 - 2001.3
Research History
-
Hokkaido University Graduate School of Information Science and Technology Division of Systems Science and Informatics Professor
2025.7
-
東京科学大学 工学院 電気電子系 准教授
2024.10 - 2025.6
-
東京工業大学 工学院 電気電子系 准教授
2016.4 - 2024.9
-
東京工業大学 大学院理工学研究科 准教授
2015.4 - 2016.3
-
東京工業大学 大学院理工学研究科 助教
2006.4 - 2015.3
-
日本学術振興会 特別研究員
2004 - 2006
Professional Memberships
-
The Institute of Electrical Engineers of Japan
-
電気学会
-
IEEE
Papers
-
Methods for Reducing AC Battery Current in Dual‐Source Trains Powered by Battery and AC Catenary Using a Single‐Phase Full‐Bridge Converter
Atsuya Suzuki, Ngo Trong Nhan, Makoto Hagiwara, Yoshiaki Taguchi
Electrical Engineering in Japan 2026.3
-
Analysis and Performance of Non-Isolated DC–DC Converter With Single Auxiliary Chopper Circuit Reviewed
Nour A. K. Hamdan, Makoto Hagiwara
IEEE Transactions on Power Electronics Volume 40 ( Issue 11 ) 17325 - 17338 2025.11
-
単相フルブリッジ変換器を適用した 交流架線式蓄電池電車の蓄電池電流交流成分抑制法
鈴木温也, ゴー チョン ニャン, 萩原 誠, 田口義晃
電気学会論文誌. D, 産業応用部門誌 Vol. 145 ( No. 9 ) 641 - 651 2025.9
-
直列接続されたパワー半導体素子のゲート磁気結合駆動におけるDG間コンデンサの効果
浦壁隆浩, 石井一輝, 萩原誠, 檜垣優介, 糸川祐樹
電気学会論文誌. D, 産業応用部門誌 Vol. 145 ( No. 4 ) 2025.4
-
AC Component-Based Control and Phase Shift Applications on Bidirectional Chopper With Auxiliary Full-Bridge Converter
Ghiffari Aby Malik Nasution, Makoto Hagiwara
IEEE Transactions on Power Electronics Vol. 40 ( No. 4 ) 2025.4
-
直列接続されたパワー半導体素子のゲート磁気結合駆動におけるゲート電圧振動の抑制法
浦壁隆浩, 神田大毅, 萩原誠, 檜垣優介, 糸川祐樹
電気学会論文誌. D, 産業応用部門誌 Vol. 145 ( No. 3 ) 2025.3
-
Negative-Sequence Reactive Power Control and Active Power Control for DC/3ϕ Power Conversion Using Single-Delta Bridge-Cell (SDBC) Converter
Atsuya Suzuki, Makoto Hagiwara, Yu-Chen Su
IEEE Access Vol. 13 2025
-
Operating Principles of Isolated Cascaded-Choppers DC-DC Converter Based on Variable Duty Ratios
Tian Luo, Makoto Hagiwara, Yu-Chen Su, Edoardo Ferri, Luigi Piegari
IEEE Transactions on Industry Applications Vol. 60 ( Issue 6 ) 2024.11
-
Bidirectional Chopper with Single-Cell Auxiliary Full-Bridge Converter for Onboard Battery Energy Storage System
Ghiffari Aby, Malik Nasution, Masaki Matsumoto, Makoto Hagiwara
IEEE Transactions on Power Electronics Vol. 39 ( Issue 8 ) 2024.8
-
Low-Voltage Ride-Through Operation of the SDBC based STATCOM integrated with one Single-Phase Converter through Medium-Frequency Transformer
Yu-chen Su, Makoto Hagiwara
IEEE Transactions on Industry Applications Vol. 60 ( Issue 2 ) 2024.3
-
An Isolated DC-DC Converter with Multiple Cascaded Choppers Featuring RMS Current Reduction toward Resilient Power Grids
Luo Tian, Yu-chen Su, Makoto Hagiwara
IEEE Transactions on Industry Applications Vol. 60 ( Issue 2 ) 2024.3
-
Automated Flexible Modeling for Various Full-SiC Power Modules
Junichi Nakashima, Takeshi Horiguchi, Yasushige Mukunoki, Makoto Hagiwara, Takahiro Urakabe, Shigeki Harada
IEEE Transactions on Power Electronics Vol. 38 ( Issue 5 ) 2023.5
-
Evaluation and Performance of Three-phase Inverter Using Multiple Bidirectional Choppers Intended for 1.5-kVdc PV Systems
Qiao Linyue, Makoto Hagiwara
IEEE Access Vol. 11 2023.4
-
Current Control of Three-phase Inverter Using Multiple Bidirectional Choppers Intended for 1.5-kV PV Systems
Qiao Linyue, Yoshifumi Shimizu, Makoto Hagiwara
IEEE Transactions on Industry Applications Vol. 59 ( No. 1 ) 2023.1
-
Reconfigurable Large Current and High Voltage Test Bench for HVDC Circuit Breaker Verification
Nikola Krneta, Makoto Hagiwara
IEEE Transactions on Power Electronics Vol. 38 ( Issue 1 ) 2023.1
-
Dual Circuit Based Test Bench Design for HVDC Circuit Breaker Verification
Nikola Krneta, Makoto Hagiwara
IEEE Transactions on Power Electronics Vol. 37 ( Issue 9 ) 10658 - 10671 2022.9
-
Kento Okumura, Makoto Hagiwara
Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) Vol. 215 ( Issue 3 ) 2022.9
-
Design and Analysis of a Novel HVDC Circuit Breaker Test Bench Based on an H-Bridge Cell MMCC
Nikola Krneta, Makoto Hagiwara
IEEE Access Vol. 10 2022.7
-
Investigation of Full SiC Power Modules for More Electric Aircraft with Focus on FIT Rate and High Frequency Switching
Junichi Nakashima, Takeshi Horiguchi, Yasushige Mukunoki, Kenji Hatori, Ryo Tsuda, Hitoshi Uemura, Makoto Hagiwara, Takahiro Urakabe
IEEE Transactions on Industry Applications Vol. 58 ( No. 3 ) 2978 - 2986 2022.5
-
A Compact High-Power Noninverting Bidirectional Buck–Boost Chopper for Onboard Battery Energy Storage Systems
Hamzeh Jamal, Ahmad Jaber, Hagiwara Makoto
IEEE Transactions on Power Electronics Vol. 37 ( No. 2 ) 2022.2
-
Single-Delta Bridge-Cell Converter With Single Single-Phase Medium-Frequency Transformer Capable of Active Power Control
M. Hagiwara, Y. Chuman, Y. Kudo
IEEE Transactions on Power Electronics Vol. 36 ( No. 11 ) 12515 - 12527 2021.11
-
3レベルフライングキャパシタ変換器をベースとした双方向非絶縁形DC-DC変換器の効率・電力密度評価
手﨑和明, 萩原誠
電気学会論文誌. D, 産業応用部門誌 Vol. 141 ( No. 9 ) 2021.9
-
Control and Experimental Verification of a Bidirectional Nonisolated DC–DC Converter Based on Switched-Capacitor Converters
Kazuaki Tesaki, Makoto Hagiwara
IEEE Transactions on Power Electronics Vol. 36 ( No. 6 ) 6501 - 6512 2021.6
-
Interleaved Bidirectional Chopper With Auxiliary Converters for DC Electric Railways
Hamzeh Jamal, Ahmad Jaber, Makoto Hagiwara
IEEE Transactions on Power Electronics Vol. 36 ( No. 5 ) 5336 - 5347 2021.5
-
Control and Experimental Verification of a Bidirectional Non-isolated DC-DC Converter Based on Three-level Flying-Capacitor Converters
Kazuaki Tesaki, Yuuji Isida, Makoto Hagiwara
IEEJ Journal of Industry Applications Vol. 10 ( No. 1 ) 2021.1
-
3レベルフライングキャパシタ変換器をベースとした双方向非絶縁形DC-DCコンバータの制御法と実験検証
手﨑和明, 石田侑次, 萩原誠
電気学会産業応用部門誌 Vol. 140 ( No. 6 ) 2020.6
-
単一デルタブリッジセル（SDBC）変換器と単相高周波変圧器を結合した直流/単相/三相変換器の動作検証
工藤悠生, 萩原誠
電気学会論文誌. D, 産業応用部門誌 Vol. 139 ( No. 12 ) 2019.12
-
Operation of a transformerless three-phase PV inverter using multiple bidirectional choppers
Ryo Yamada, Makoto Hagiwara
Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) Vol. 209 ( Issue 1-2 ) 2019.9
-
複数の双方向チョッパを使用したトランスレス三相PVインバータの動作検証
山田遼, 萩原誠
電気学会論文誌. D, 産業応用部門誌 Vol. 139 ( No. 8 ) 2019.8
-
Control and experiment of a bidirectional chopper with an auxiliary converter
Ohnishi Haruna, Makoto Hagiwara
Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) Vol. 102 ( Issue 2 ) 2019.2
-
An Improved Compact Model for a Silicon-Carbide MOSFET and Its Application to Accurate Circuit Simulation
Y. Mukunoki, K. Konno, T. Horiguchi, A. Nishizawa, M. Kuzumoto, M. Hagiwara, H. Akagi
IEEE Transactions on Power Electronics Vol. 33 ( No. 11 ) 2018.11
-
eラーニングを活用した工学系専門科目の理解度向上 -東京工業大学電気電子系-
千葉 明, 安岡 康一, 中川 茂樹, 赤塚 洋, 西方 敦博, 萩原 誠, 渡辺 正裕, 竹内 希, 全 俊豪, 時岡 えい
工学教育 Vol. 66 ( No. 5 ) 2018.10
-
補助変換器を有する双方向チョッパの制御法と動作検証
大西晴菜, 萩原誠
電気学会産業応用部門誌 Vol. 138 ( No. 7 ) 2018.7
-
An Induction-Motor Control Method for Minimization of Capacitor-Voltage Fluctuations in a Modular Multilevel DSCC Inverter: Its Applications to a Quadratic-Torque Load Reviewed
Yuhei Okazaki, Hitoshi Matsui, M. Moses Muhoro, Makoto Hagiwara, Hirofumi Akagi
ELECTRICAL ENGINEERING IN JAPAN 201 ( 4 ) 34 - 44 2017.12
-
AC-Inductors Design for a Modular Multilevel TSBC Converter, and Performance of a Low-Speed High-Torque Motor Drive Using the Converter Reviewed
Wataru Kawamura, Makoto Hagiwara, Hirofumi Akagi, Masahiko Tsukakoshi, Ritaka Nakamura, Sumiyasu Kodama
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 53 ( 5 ) 4718 - 4729 2017.9
-
A Hybrid DC Circuit Breaker Combining a Multilevel Converter and Mechanical Contactors: Verification of the Principles of Operation by Experiment and Simulation Reviewed
Masayuki Oishi, Atsushi Suzuki, Makoto Hagiwara, Hirofumi Akagi
ELECTRICAL ENGINEERING IN JAPAN 200 ( 3 ) 13 - 22 2017.8
-
Experimental Verification of an Electrical Drive Fed by a Modular Multilevel TSBC Converter When the Motor Frequency Gets Closer or Equal to the Supply Frequency Reviewed
Wataru Kawamura, Yuto Chiba, Makoto Hagiwara, Hirofumi Akagi
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 53 ( 3 ) 2297 - 2306 2017.5
-
A Low-Speed, High-Torque Motor Drive Using a Modular Multilevel Cascade Converter Based on Triple-Star Bridge Cells (MMCC-TSBC) Reviewed
Wataru Kawamura, Makoto Hagiwara, Hirofumi Akagi
ELECTRICAL ENGINEERING IN JAPAN 198 ( 4 ) 73 - 82 2017.3
-
Experimental Comparisons Between Modular Multilevel DSCC Inverters and TSBC Converters for Medium-Voltage Motor Drives Reviewed
Yuhei Okazaki, Wataru Kawamura, Makoto Hagiwara, Hirofumi Akagi, Takashi Ishida, Masahiko Tsukakoshi, Ritaka Nakamura
IEEE TRANSACTIONS ON POWER ELECTRONICS 32 ( 3 ) 1805 - 1817 2017.3
-
Capacitor-Voltage Balancing for a Modular Multilevel DSCC Inverter Driving a Medium-Voltage Synchronous Motor Reviewed
Yuhei Okazaki, Hitoshi Matsui, Mbugua Moses Muhoro, Makoto Hagiwara, Hirofumi Akagi
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 52 ( 5 ) 4074 - 4083 2016.9
-
マルチレベル変換器と機械接点を併用したハイブリッド直流遮断器：実験とシミュレーションによる動作原理検証
大石将幸, 鈴木敦詞, 萩原誠, 赤木泰文
電気学会産業応用部門誌 Vol. 136 ( No. 8 ) 2016.8
-
A Medium-Voltage Large Wind Turbine Generation System Using an AC/AC Modular Multilevel Cascade Converter Reviewed
Nuntawat Thitichaiworakorn, Makoto Hagiwara, Hirofumi Akagi
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS 4 ( 2 ) 534 - 546 2016.6
-
Theory and Experiment on an Optimal Carrier Frequency of a Modular Multilevel Cascade Converter With Phase-Shifted PWM Reviewed
Firman Sasongko, Kei Sekiguchi, Kota Oguma, Makoto Hagiwara, Hirofumi Akagi
IEEE TRANSACTIONS ON POWER ELECTRONICS 31 ( 5 ) 3456 - 3471 2016.5
-
Zero-Voltage Ride-Through Capability of a Transformerless Back-To-Back System Using Modular Multilevel Cascade Converters for Power Distribution Systems Reviewed
Pracha Khamphakdi, Masahiro Nitta, Makoto Hagiwara, Hirofumi Akagi
IEEE TRANSACTIONS ON POWER ELECTRONICS 31 ( 4 ) 2730 - 2741 2016.4
-
Okazaki Yuhei, Matsui Hitoshi, Muhoro M. Moses, Hagiwara Makoto, Akagi Hirofumi
IEEJ Transactions on Industry Applications 136 ( 5 ) 336 - 345 2016
-
Power Flow Analysis and DC-Capacitor Voltage Regulation for the MMCC-DSCC Reviewed
Hideaki Fujita, Makoto Hagiwara, Hirofumi Akagi
ELECTRICAL ENGINEERING IN JAPAN 193 ( 1 ) 1 - 9 2015.10
-
A Low-Speed, High-Torque Motor Drive Using a Modular Multilevel Cascade Converter Based on Triple-Star Bridge Cells (MMCC-TSBC) Reviewed
Wataru Kawamura, Kuan-Liang Chen, Makoto Hagiwara, Hirofumi Akagi
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 51 ( 5 ) 3965 - 3974 2015.9
-
Wataru Kawamura, Makoto Hagiwara, Hirofumi Akagi
IEEJ Transactions on Industry Applications 135 ( 7 ) 775 - 786 2015.7
-
A Transformerless Back-To-Back (BTB) System Using Modular Multilevel Cascade Converters For Power Distribution Systems Reviewed
Pracha Khamphakdi, Kei Sekiguchi, Makoto Hagiwara, Hirofumi Akagi
IEEE TRANSACTIONS ON POWER ELECTRONICS 30 ( 4 ) 1866 - 1875 2015.4
-
TSBC方式モジュラー・マルチレベル・カスケード変換器(MMCC-TSBC)を用いた低速高トルクモータドライブ
川村弥, 萩原誠, 赤木泰文
電気学会産業応用部門誌 Vol. 135 ( No. 2 ) 2015.2
-
A low-speed, high-torque motor drive using a modular multilevel cascade converter based on triple-star bridge cells (mmcc-tsbc) Reviewed
Wataru Kawamura, Makoto Hagiwara, Hirofumi Akagi
IEEJ Transactions on Industry Applications 135 ( 2 ) 162 - 169 2015.2
-
Design and Evaluation of AC Inductors Indispensable to a Modular Multilevel Cascade Converter (MMCC-TSBC) for Medium-voltage Motor Drives Reviewed
Wataru Kawamura, Makoto Hagiwara, Hirofumi Akagi
2015 IEEE 2ND INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE (IFEEC) 1 - 6 2015
-
Yuhei Okazaki, Makoto Hagiwara, Hirofumi Akagi
2015 IEEE 2ND INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE (IFEEC) 1 - 6 2015
-
Wataru Kawamura, Yuto Chiba, Makoto Hagiwara, Hirofumi Akagi
2015 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 5490 - 5497 2015
-
Which is More Suitable for MMCC-Based Medium-Voltage Motor Drives, a DSCC Inverter or a TSBC Converter? Reviewed
Yuhei Okazaki, Wataru Kawamura, Makoto Hagiwara, Hirofumi Akagi, Takashi Ishida, Masahiko Tsukakoshi, Ritaka Nakamura
2015 9TH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND ECCE ASIA (ICPE-ECCE ASIA) 1053 - 1060 2015
-
Oguma Kota, Sasongko Firman, Hagiwara Makoto, Akagi Hirofumi
IEEJ Transactions on Sensors and Micromachines 135 ( 7 ) 794 - 801 2015
-
Enhancement on Capacitor-Voltage-Balancing Capability of a Modular Multilevel Cascade Inverter for Medium-Voltage Synchronous-Motor Drives Reviewed
Yuhei Okazaki, Hitoshi Matsui, Mbugua Moses Muhoro, Makoto Hagiwara, Hirofumi Akagi
2015 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 6352 - 6359 2015
-
Kota Oguma, Firman Sasongko, Makoto Hagiwara, Hirofumi Akagi
2015 IEEE 2ND INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE (IFEEC) 1 - 6 2015
-
位相シフトPWMを適用したモジュラー・マルチレベル・カスケード変換器（MMCC-DSCC）の三角波キャリア周波数の検討
関口慧, 新田将大, 萩原誠, 赤木泰文
電気学会産業応用部門誌 Vol. 134 ( No. 10 ) 2014.10
-
Control and Experiment of a Modular Multilevel Cascade Converter Based on Triple-Star Bridge Cells Reviewed
Wataru Kawamura, Makoto Hagiwara, Hirofumi Akagi
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 50 ( 5 ) 3536 - 3548 2014.9
-
A Speed-Sensorless Start-Up Method of an Induction Motor Driven by a Modular Multilevel Cascade Inverter (MMCI-DSCC) Reviewed
Yuhei Okazaki, Makoto Hagiwara, Hirofumi Akagi
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 50 ( 4 ) 2671 - 2680 2014.7
-
A Grid-Level High-Power BTB (Back-To-Back) System Using Modular Multilevel Cascade Converters Without Common DC-Link Capacitor Reviewed
Kei Sekiguchi, Pracha Khamphakdi, Makoto Hagiwara, Hirofumi Akagi
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 50 ( 4 ) 2648 - 2659 2014.7
-
Experiment and Simulation of a Modular Push-Pull PWM Converter for a Battery Energy Storage System Reviewed
Makoto Hagiwara, Hirofumi Akagi
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 50 ( 2 ) 1131 - 1140 2014.3
-
Experimental Verification of a Modular Multilevel Cascade Inverter Based on Double-Star Bridge Cells Reviewed
Nuntawat Thitichaiworakorn, Makoto Hagiwara, Hirofumi Akagi
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 50 ( 1 ) 509 - 519 2014.1
-
Wataru Kawamura, Makoto Hagiwara, Hirofumi Akagi
2014 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-HIROSHIMA 2014 - ECCE-ASIA) 3742 - 3749 2014
-
Research Trends of Modular Multilevel Cascade Inverter (MMCI-DSCC)-Based Medium-Voltage Motor Drives in a Low-Speed Range Reviewed
Yuhei Okazaki, Hitoshi Matsui, Makoto Hagiwara, Hirofumi Akagi
2014 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-HIROSHIMA 2014 - ECCE-ASIA) 1586 - 1593 2014
-
Control and Experiment of a Modular Push-Pull PWM Converter for a Battery Energy Storage System Reviewed
Makoto Hagiwara, Hirofumi Akagi
2014 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-HIROSHIMA 2014 - ECCE-ASIA) 2323 - 2329 2014
-
A Low-Speed, High-Torque Motor Drive Using the Modular Multilevel Cascade Converter Based on Triple-Star Bridge Cells (MMCC-TSBC) Reviewed
Wataru Kawamura, Kuan-Liang Chen, Makoto Hagiwara, Hirofumi Akagi
2014 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 1631 - 1638 2014
-
Yuhei Okazaki, Hitoshi Matsui, Makoto Hagiwara, Hirofumi Akagi
2014 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 3393 - 3400 2014
-
Start-Up and Low-Speed Operation of an Electric Motor Driven by a Modular Multilevel Cascade Inverter Reviewed
Makoto Hagiwara, Isamu Hasegawa, Hirofumi Akagi
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 49 ( 4 ) 1556 - 1565 2013.7
-
Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
ELECTRICAL ENGINEERING IN JAPAN 183 ( 4 ) 33 - 44 2013.6
-
A Front-to-Front (FTF) System Consisting of Two Modular Multilevel Cascade Converters Based on Double-Star Chopper-Cells Reviewed
Firman Sasongko, Makoto Hagiwara, Hirofumi Akagi
2013 1ST INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE (IFEEC 2013) 197 ( 1 ) 488 - 493 2013
-
Wataru Kawamura, Makoto Hagiwara, Hirofumi Akagi
2013 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 4014 - 4021 2013
-
A Speed-Sensorless Startup of an Induction Motor Driven by a Modular Multilevel Cascade Inverter (MMCI-DSCC) -Applications to Quadratic-Torque Loads Like Fans, Blowers, and Compressors Reviewed
Yuhei Okazaki, Makoto Hagiwara, Hirofumi Akagi
2013 1ST INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE (IFEEC 2013) 471 - 475 2013
-
Modeling and analysis of switching-ripple voltage on the DC link between a diode rectifier and a modular multilevel cascade inverter (MMCI) Reviewed
Hui Peng, Makoto Hagiwara, Hirofumi Akagi
IEEE Transactions on Power Electronics 28 ( 1 ) 75 - 84 2013
-
Control and verification of a modular push-pull PWM converter for a battery energy storage system Reviewed
Makoto Hagiwara, Hirofumi Akagi
IEEJ Transactions on Industry Applications 133 ( 10 ) 1031 - 1039 2013
-
A Speed-Sensorless Startup Method of an Induction Motor Driven by a Modular Multilevel Cascade Inverter (MMCI-DSCC) Reviewed
Yuhei Okazaki, Makoto Hagiwara, Hirofumi Akagi
2013 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 1473 - 1480 2013
-
Design and Experiment of a Back-To-Back (BTB) System Using Modular Multilevel Cascade Converters for Power Distribution Systems Reviewed
Pracha Khamphakdi, Kei Sekiguchi, Makoto Hagiwara, Hirofumi Akagi
2013 IEEE ECCE ASIA DOWNUNDER (ECCE ASIA) 311 - 317 2013
-
Experimental Verification of a Modular Multilevel Cascade Converter Based on Triple-Star Bridge-Cells (MMCC-TSBC) for Motor Drives Reviewed
Wataru Kawamura, Makoto Hagiwara, Hirofumi Akagi
2013 1ST INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE (IFEEC 2013) 454 - 459 2013
-
Nuntawat Thitichaiworakorn, Makoto Hagiwara, Hirofumi Akagi
2013 1ST INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE (IFEEC 2013) 476 - 481 2013
-
A speed-sensorless start-up method for an induction motor driven by a modular multilevel cascade inverter based on double-star chopper cells (MMCI-DSCC) Reviewed
Yuhei Okazaki, Makoto Hagiwara, Hirofumi Akagi
IEEJ Transactions on Industry Applications 133 ( 12 ) 1157 - 1164 2013
-
Sekiguchi Kei, Khamphakdi Pracha, Hagiwara Makoto, Akagi Hirofumi
IEEJ Transactions on Sensors and Micromachines 133 ( 11 ) 1089 - 1096 2013
-
Negative-Sequence Reactive-Power Control by a PWM STATCOM Based on a Modular Multilevel Cascade Converter (MMCC-SDBC) Reviewed
Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 48 ( 2 ) 720 - 729 2012.3
-
Experimental Verification of a Modular Multilevel Cascade Inverter Based on Double-Star Bridge-Cells (MMCI-DSBC) Reviewed
Nuntawat Thitichaiworakorn, Makoto Hagiwara, Hirofumi Akagi
2012 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 4196 - 4202 2012
-
Startup and Low-Speed Operation of an Adjustable-Speed Motor Driven by a Modular Multilevel Cascade Inverter (MMCI) Reviewed
Makoto Hagiwara, Isamu Hasegawa, Hirofumi Akagi
2012 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 718 - 725 2012
-
Control and Analysis of the Modular Multilevel Cascade Converter Based on Double-Star Chopper-Cells (MMCC-DSCC) Reviewed
Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
IEEE TRANSACTIONS ON POWER ELECTRONICS 26 ( 6 ) 1649 - 1658 2011.6
-
Negative-Sequence Reactive-Power Control by a PWM STATCOM Based on a Modular Multilevel Cascade Converter (MMCC-SDBC) Reviewed
Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
2011 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 3728 - 3735 2011
-
Elucidation of DC Magnetic Deviation in Converter Transformers Used for a Self-Commutated BTB System during Single-Line-to-Ground Faults Reviewed
Makoto Hagiwara, Phuong Viet Pham, Hirofumi Akagi
ELECTRICAL ENGINEERING IN JAPAN 168 ( 2 ) 48 - 59 2009.7
-
A Modular Multilevel PWM Inverter for Medium-Voltage Motor Drives Reviewed
Makoto Hagiwara, Kazutoshi Nishimura, Hirofumi Akagi
2009 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION, VOLS 1-6 2811 - 2818 2009
-
Effects of Phase-Locked-Loop Circuit on a Self-Commutated BTB System under Line Faults Reviewed
Phuong Viet Pham, Makoto Hagiwara, Hirofumi Akagi
2008 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-10 1708 - 1714 2008
-
PWM Control and Experiment of Modular Multilevel Converters Reviewed
Makoto Hagiwara, Hirofumi Akagi
2008 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-10 154 - 161 2008
-
自励式BTB(Back-To-Back)の制御法とシステム構成に関する研究
Makoto Hagiwara
2006.3
-
Magnetic saturation in transformers used for a self-commutated BTB system with ride-through capability during voltage sags Reviewed
Makoto Hagiwara, Phuong Viet Pham, Hirofumi Akagi
2006 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-7 16 - + 2006
-
Makoto Hagiwara, Hideaki Fujita, Hirofumi Akagi
Conference Record - IAS Annual Meeting (IEEE Industry Applications Society) 3 1432 - 1438 2004
MISC
-
A Method for Reducing AC Battery Current in Dual-Source Train Fed by Battery and AC Catenary
Ngo Trong Nhan, Atsuya Susuki, Makoto Hagiwara
2025 IEEE Energy Conversion Congress and Exposition (ECCE-Asia) 1 - 6 2025.5
-
神山 倭, 萩原 誠
電気学会研究会資料. MD / モータドライブ研究会 [編] 2025 ( 1-7・9-18 ) 49 - 54 2025.1
-
神山 倭, 萩原 誠
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2025 ( 1-7・9-18 ) 49 - 54 2025.1
-
萩原 誠, Nasution Ghiffari Aby Malik, 原田 茂樹, 浦壁 隆浩, 藤原 賢司, 近藤 亮太, 城内 悠輔, 永井 孝佳
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2025 ( 1-7・9-18 ) 31 - 36 2025.1
-
萩原 誠, Nasution Ghiffari Aby Malik, 原田 茂樹, 浦壁 隆浩, 藤原 賢司, 近藤 亮太, 城内 悠輔, 永井 孝佳
電気学会研究会資料. MD / モータドライブ研究会 [編] 2025 ( 1-7・9-18 ) 31 - 36 2025.1
-
鈴木 温也, Ngo Trong Nhan, 萩原 誠, 田口 義晃
電気学会研究会資料. VT / [電気学会自動車研究会] [編] 2024 ( 57-62・64-78 ) 61 - 66 2024.12
-
鈴木 温也, Ngo Trong Nhan, 萩原 誠, 田口 義晃
電気学会研究会資料. HCA / 家電・民生研究会 [編] 2024 ( 32-37・39-53 ) 61 - 66 2024.12
-
鈴木 温也, Ngo Trong Nhan, 萩原 誠, 田口 義晃
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2024 ( 212-217・219-233 ) 61 - 66 2024.12
-
Ghiffari Aby Malik Nasution, Makoto Hagiwara
2024 13th International Conference on Renewable Energy Research and Applications (ICRERA) 400 - 407 2024.11
-
鈴木 温也, Ngo Trong Nhan, 萩原 誠, 田口 義晃
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2024 ( 145-151 ) 19 - 24 2024.7
-
山田 竜也, 萩原 誠
電気学会研究会資料. EMC = The papers of technical meeting on electromagnetic compatibility, IEE Japan 2024 ( 5-20・22-25 ) 51 - 56 2024.6
-
山田 竜也, 萩原 誠
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2024 ( 124-139・141-144 ) 51 - 56 2024.6
-
Power Analysis of Flying Capacitor Converter Utilizing Singular Auxiliary Chopper
Nour A.K. Hamdan, Makoto Hagiwara
2024 IEEE 10th International Power Electronics and Motion Control Conference (IPEMC2024-ECCE Asia) 2178 - 2183 2024.5
-
Dynamic Behavior of Isolated DC-DC Converter Based on Bidirectional Switches
Yamato Kamiyama, Makoto Hagiwara
2024 IEEE 10th International Power Electronics and Motion Control Conference (IPEMC2024-ECCE Asia) 3888 - 3892 2024.5
-
Inner Power Control of Capacitively-isolated Bidirectional DC-DC Converter with Auxiliary Converters
Trong Nhan Ngo, Tatsuya Yamada, Makoto Hagiwara
2024 IEEE 10th International Power Electronics and Motion Control Conference (IPEMC2024-ECCE Asia) 684 - 689 2024.5
-
Ghiffari Aby Malik Nasution, Masaki Matsumoto, Makoto Hagiwara
2023 IEEE Energy Conversion Congress and Exposition (ECCE) 6357 - 6364 2023.10
-
鈴木 温也, 中村 優飛, 萩原 誠
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2023 ( 228-250 ) 123 - 128 2023.10
-
鈴木 温也, 中村 優飛, 萩原 誠
電気学会研究会資料. EDD = The papers of technical meeting on electron devices, IEE Japan / 電子デバイス研究会 [編] 2023 ( 45-67 ) 123 - 128 2023.10
-
中村 優飛, 鈴木 温也, 萩原 誠
電気学会研究会資料. EDD = The papers of technical meeting on electron devices, IEE Japan / 電子デバイス研究会 [編] 2023 ( 45-67 ) 129 - 134 2023.10
-
中村 優飛, 鈴木 温也, 萩原 誠
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2023 ( 228-250 ) 129 - 134 2023.10
-
神田 大毅, 石井 一輝, 浦壁 隆浩, 萩原 誠, 糸川 祐樹, 檜垣 優介
電気学会研究会資料. EDD = The papers of technical meeting on electron devices, IEE Japan / 電子デバイス研究会 [編] 2023 ( 26-37・39-44 ) 19 - 24 2023.10
-
神田 大毅, 石井 一輝, 浦壁 隆浩, 萩原 誠, 糸川 祐樹, 檜垣 優介
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2023 ( 209-220・222-227 ) 19 - 24 2023.10
-
松本 雅輝, Nasution Ghiffari Aby Malik, 萩原 誠
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2023 ( 160-176・178-181 ) 19 - 24 2023.7
-
石井 一輝, 神田 大毅, 浦壁 隆浩, 萩原 誠, 糸川 祐樹, 檜垣 優介
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2023 ( 160-176・178-181 ) 43 - 48 2023.7
-
2023 ( 160-176・178-181 ) 13 - 18 2023.7
-
2023 ( 44-56 ) 67 - 72 2023.1
-
高木 悠介, 池田 達樹, 羅 天, 萩原 誠
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2022 ( 143-147・149-159・161-171 ) 59 - 64 2022.9
-
池田 達樹, 高木 悠介, 羅 天, 萩原 誠
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2022 ( 143-147・149-159・161-171 ) 53 - 58 2022.9
-
高木 悠介, 池田 達樹, 羅 天, 萩原 誠
電気学会研究会資料. MD / モータドライブ研究会 [編] 2022 ( 78-82・84-94・96-106 ) 59 - 64 2022.9
-
Operation of Single-Delta Bridge-Cell Converter With Single-Phase Medium-Frequency Transformer Under Low Magnetizing Inductance
Kento Okumura, Makoto Hagiwara
2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia) 2194 - 2201 2022.5
-
Control and Performance of Capacitively-Isolated Bidirectional DC-DC Converter with Auxiliary Converters for Electric Railways
Kana Matsumoto, Kazuaki Tesaki, Makoto Hagiwara
2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia) 1626 - 1632 2022.5
-
松本 花奈, 手崎 和明, 萩原 誠
電気学会研究会資料. MD / モータドライブ研究会 [編] 2022 ( 30-39 ) 37 - 42 2022.1
-
松本 花奈, 手崎 和明, 萩原 誠
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2022 ( 30-39 ) 37 - 42 2022.1
-
奥村 健人, 萩原 誠
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2022 ( 30-39 ) 7 - 12 2022.1
-
原田 英将, 萩原 誠
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2022 ( 30-39 ) 31 - 36 2022.1
-
奥村 健人, 萩原 誠
電気学会研究会資料. MD / モータドライブ研究会 [編] 2022 ( 30-39 ) 7 - 12 2022.1
-
原田 英将, 萩原 誠
電気学会研究会資料. MD / モータドライブ研究会 [編] 2022 ( 30-39 ) 31 - 36 2022.1
-
中西 達哉, 浦壁 隆浩, 萩原 誠, 中嶋 純一, 檜垣 優介, 地道 拓志
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2022 ( 1・3-13 ) 45 - 50 2022.1
-
Makoto Hagiwara, Hamzeh J. Ahmad
2021 IEEE International Future Energy Electronics Conference (IFEEC) 1 - 6 2021.11
-
Experimental Verification of Three-phase PV Inverter Using Multiple Bidirectional Choppers for Utility-scale PV Systems
Yoshifumi Shimizu, Makoto Hagiwara, Linyue Qiao
2021 IEEE Energy Conversion Congress and Exposition (ECCE) 259 - 266 2021.10
-
Modified Phase-Shifted PWM for Interleaved Bidirectional Chopper With Auxiliary Converters
Hamzeh J. Ahmad, Makoto Hagiwara
2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia) 755 - 761 2021.5
-
2021 ( 45-60 ) 91 - 96 2021.1
-
手崎 和明, 萩原 誠
電気学会研究会資料. MD / モータドライブ研究会 [編] 2021 ( 29-44 ) 69 - 74 2021.1
-
中馬 嘉仁, 萩原 誠
電気学会研究会資料. MD / モータドライブ研究会 [編] 2021 ( 1-14 ) 49 - 54 2021.1
-
A Non-Isolated Bidirectional Buck-Boost Chopper With Auxiliary Converter for Battery Energy Storage Systems
Hamzeh J. Ahmad, Makoto Hagiwara
2020 IEEE 9th International Power Electronics and Motion Control Conference (IPEMC2020-ECCE Asia) 2627 - 2633 2020.11
-
A Bidirectional Non-isolated DC-DC Converter Based on Switched-Capacitor Converters for DC Electric Railways
Makoto Hagiwara, Kazuaki Tesaki
2020 IEEE Energy Conversion Congress and Exposition (ECCE) 613 - 620 2020.10
-
手崎 和明, 萩原 誠
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2020 ( 129-131・133-162・164-173・175・177-183 ) 119 - 122 2020.9
-
原田 英将, 萩原 誠
電気学会研究会資料. HCA / 家電・民生研究会 [編] 2020 ( 22-24・26-55・57-66・68・70-76 ) 125 - 128 2020.9
-
Interleaved Bidirectional Chopper With Auxiliary Converters for Battery Energy Storage Systems
Hamzeh J. Ahmad, Makoto Hagiwara
2020 IEEE Applied Power Electronics Conference and Exposition (APEC) 2090 - 2097 2020.3
-
手崎 和明, 萩原 誠
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2020 ( 28-41 ) 31 - 36 2020.1
-
宮葉 啓彰, 萩原 誠
電気学会研究会資料. MD / モータドライブ研究会 [編] 2020 ( 28-41 ) 55 - 60 2020.1
-
滕 飛, 葛本 昌樹, 萩原 誠, 石井 佑季, 中嶋 純一, 堀口 剛司, 椋木 康滋, 地道 拓志
電気学会研究会資料. EDD = The papers of technical meeting on electron devices, IEE Japan / 電子デバイス研究会 [編] 2019 ( 60-62・64-74 ) 39 - 44 2019.11
-
HVDC Breaker Test Bench Based on a Power Converter Using Cascaded H-bridge Cells
Makoto Hagiwara, Nikola Kmeta
2019 IEEE Energy Conversion Congress and Exposition (ECCE) 67 - 74 2019.9
-
Physical Analysis of Gate-Source Voltage Dependencies of Parasitic Capacitors, and Their Impacts on Switching Behavior of a Discrete Silicon-Carbide MOSFET
Hirofumi Akagi, Makoto Hagiwara, Masaki Kuzumoto, Takeshi Horiguchi, Yasushige Mukunok, Hiroshi Nakatake
2019 10th International Conference on Power Electronics and ECCE Asia (ICPE 2019 - ECCE Asia) 3054 - 3058 2019.5
-
工藤 悠生, 萩原 誠, 赤木 泰文
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2019 ( 42-51 ) 25 - 30 2019.1
-
工藤 悠生, 萩原 誠, 赤木 泰文
電気学会研究会資料. MD / モータドライブ研究会 [編] 2019 ( 42-51 ) 25 - 30 2019.1
-
山田 遼, 萩原 誠
電気学会研究会資料. MD / モータドライブ研究会 [編] 2019 ( 31-41 ) 25 - 30 2019.1
-
手崎 和明, 萩原 誠
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2019 ( 12-20 ) 39 - 44 2019.1
-
2019 ( 12-20 ) 51 - 56 2019.1
-
Start-Up and Transient Operation of a Bidirectional Chopper With an Auxiliary Converter
Hamzeh J. Ahmad, Haruna Ohnishi, Makoto Hagiwara
2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia) 3273 - 3279 2018.5
-
Yasushige Mukunoki, Takeshi Horiguchi, Akinori Nishizawa, Kentaro Konno, Tsubasa Matsuo, Masaki Kuzumoto, Makoto Hagiwara, Hirofumi Akagi
2018 IEEE Applied Power Electronics Conference and Exposition (APEC) 2855 - 2860 2018.3
-
大西 晴菜, 萩原 誠
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2018 ( 40-51 ) 61 - 66 2018.1
-
生出 珠之助, 手崎 和明, 市川 耕作, 萩原 誠, 赤木 泰文, 大開 美子, 西沢 昭則
電気学会研究会資料. MD / モータドライブ研究会 [編] 2018 ( 14-25 ) 65 - 70 2018.1
-
昆野 賢太郎, 葛本 昌樹, 萩原 誠, 赤木 泰文, 椋木 康滋, 堀口 剛司, 西沢 昭則
電気学会研究会資料. EDD = The papers of technical meeting on electron devices, IEE Japan / 電子デバイス研究会 [編] 2017 ( 52-65・67-73 ) 35 - 40 2017.11
-
Haruna Ohnishi, Makoto Hagiwara
2017 IEEE Energy Conversion Congress and Exposition (ECCE) 197 - 204 2017.10
-
A case study in micro grid using adaptive enhanced linear exponential smoothing technique
Siriroj Sirisukprasert, Makoto Hagiwara, Ekasit Usaratniwart, Natchpong Hatti
2017 8th International Conference of Information and Communication Technology for Embedded Systems (IC-ICTES) 1 - 6 2017.5
-
大石 将幸, 鈴木 敦詞, 萩原 誠
電気学会研究会資料. MD / モータドライブ研究会 [編] 2016 ( 18-22・24-28 ) 43 - 48 2016.1
-
2016 ( 18 ) 43 - 48 2016.1
-
松井 仁志, 岡崎 佑平, Muhoro Mbugua, 萩原 誠, 赤木 泰文
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2015 ( 30-49・51-61 ) 31 - 36 2015.1
-
新田 将大, カムプラツグデー プラシャー, 萩原 誠
電気学会研究会資料. MD / モータドライブ研究会 [編] 2015 ( 30-49・51-61 ) 13 - 18 2015.1
-
IEEJ Transactions on Industry Applications 135 ( 3 ) NL3_4 - NL3_4 2015
-
小熊 功太, Firman Sasongko, 萩原 誠, 赤木 泰文
電気学会研究会資料. PE / 電気学会電力技術研究会 [編] 2014 ( 203-206・208-210 ) 27 - 32 2014.11
-
Firman Sasongko, Makoto Hagiwara, Hirofumi Akagi
2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA) 1761 - 1768 2014.5
-
Kei Sekiguchi, Pracha Khamphakdi, Makoto Hagiwara, Hirofumi Akagi
2013 IEEE Energy Conversion Congress and Exposition 3382 - 3389 2013.9
-
関口 慧, Pracha Khamphakdi, 萩原 誠, 赤木 泰文
電気学会研究会資料. SPC = The papers of technical meeting on semiconductor power converter, IEE Japan / 半導体電力変換研究会 [編] 2013 ( 1-14 ) 65 - 70 2013.1
-
A BTB (Back-To-Back) System Using the Modular Multilevel Cascade Converter (MMCC-DSCC) : Verification by Experiment and Simulation
SEKIGUCHI Kei, KHAMPHAKDI Pracha, HAGIWARA Makoto, AKAGI Hirofumi
2013 ( 1 ) 65 - 70 2013.1
-
Low-Speed Operation of a Medium-Voltage Motor Drive Using a Modular Multilevel Cascade Inverter (MMCI-DSCC)
HAGIWARA Makoto, HASEGAWA Isamu, AKAGI Hirofumi
IEEJ Transactions on Industry Applications 132 ( 11 ) 1072 - 1079 2012.11
-
Power Flow Analysis and DC-Capacitor Voltage Regulation for the MMCC-DSCC
FUJITA Hideaki, HAGIWARA Makoto, AKAGI Hirofumi
IEEJ Transactions on Industry Applications 132 ( 6 ) 659 - 665 2012.6
-
Low-Frequency Operation of a Medium-Voltage Motor Drive Using a Modular Multilevel Cascade Inverter (MMCI-DSCC)
HASEGAWA Isamu, HAGIWARA Makoto, AKAGI Hirofumi
2012 ( 28 ) 91 - 96 2012.1
-
Discussions on a Modular Multilevel Cascade Converter (MMCC-DSCC) for a High-Power BTB System
DOI Masashi, HAGIWARA Makoto, AKAGI Hirofumi
2012 ( 28 ) 55 - 60 2012.1
-
A Battery Energy Storage System With a Modular Push-Pull PWM Converter
HAGIWARA Makoto, AKAGI Hirofumi
2012 ( 28 ) 49 - 54 2012.1
-
A Battery Energy Storage System With a Modular Push-Pull PWM Converter
HAGIWARA Makoto, AKAGI Hirofumi
2012 ( 28 ) 49 - 54 2012.1
-
Low-Frequency Operation of a Medium-Voltage Motor Drive Using a Modular Multilevel Cascade Inverter (MMCI-DSCC)
HASEGAWA Isamu, HAGIWARA Makoto, AKAGI Hirofumi
2012 ( 28 ) 91 - 96 2012.1
-
Discussions on a Modular Multilevel Cascade Converter (MMCC-DSCC) for a High-Power BTB System
DOI Masashi, HAGIWARA Makoto, AKAGI Hirofumi
2012 ( 28 ) 55 - 60 2012.1
-
Application of a Modular Multilevel Cascade Converter (MMCC-SDBC) to a STATCOM : Control of Active Power and Negative-Sequence Reactive Power
HAGIWARA Makoto, MAEDA Ryo, AKAGI Hirofumi
IEEJ Transactions on Industry Applications 131 ( 12 ) 1433 - 1441 2011.12
-
Discussions on Switching-Ripple Voltages on the Common DC Link of the Modular Multilevel Cascade Inverter (MMCI-DSCC)
HAGIWARA Makoto, PENG Hui, AKAGI Hirofumi
IEEJ Transactions on Industry Applications 131 ( 12 ) 1424 - 1432 2011.12
-
An Application of a Modular Multilevel Cascade Converter (MMCC-SDBC) to a STATCOM : Control of Active Power and Negative-Sequence Reactive Power
MAEDA Ryo, HAGIWARA Makoto, AKAGI Hirofumi
2011 ( 1 ) 65 - 70 2011.1
-
Theoretical Analysis and Control of the Modular Multilevel Cascade Converter Based on Double-Star Chopper-Cells (MMCC-DSCC)
HAGIWARA Makoto, MAEDA Ryo, AKAGI Hirofumi
IEEJ Transactions on Industry Applications 131 ( 1 ) 84 - 92 2011.1
-
Makoto Hagiwara, Ryo Maeda, Hirofumi Akagi
2010 IEEE Energy Conversion Congress and Exposition 3949 - 3954 2010.9
-
A Medium-Voltage Motor Drive With a Modular Multilevel PWM Inverter
Makoto Hagiwara, Kazutoshi Nishimura, Hirofumi Akagi
IEEE TRANSACTIONS ON POWER ELECTRONICS 25 ( 7 ) 1786 - 1799 2010.7
-
Analysis of the Dynamic Behavior of a Self-Commutated BTB System During Line Faults
Phuong Viet Pham, Makoto Hagiwara, Hirofumi Akagi
IEEE TRANSACTIONS ON POWER ELECTRONICS 25 ( 2 ) 322 - 330 2010.2
-
HAGIWARA Makoto, NISHIMURA Kazutoshi, AKAGI Hirofumi
IEEJ Transactions on Industry Applications 130 ( 4 ) 544 - 551 2010
-
Kazutoshi Nishimura, Makoto Hagiwara, Hirofumi Akagi
IEEJ Transactions on Industry Applications 130 ( 4 ) 552 - 559 2010
-
NISHIMURA Kazutoshi, HAGIWARA Makoto, AKAGI Hirofumi
IEEJ Transactions on Sensors and Micromachines 130 ( 4 ) 552 - 559 2010
-
Makoto Hagiwara, Kazutoshi Nishimura, Hirofumi Akagi
IEEJ Transactions on Industry Applications 130 ( 4 ) 544 - 551 2010
-
Control and Experiment of Pulsewidth-Modulated Modular Multilevel Converters
Makoto Hagiwara, Hirofumi Akagi
IEEE TRANSACTIONS ON POWER ELECTRONICS 24 ( 7 ) 1737 - 1746 2009.7
-
Applications of a Modular Multilevel Converter to Medium-Voltage Motor Drives : Experimental Verification by a 400-V, 15-kW Laboratory System
NISHIMURA Kazutoshi, HAGIWARA Makoto, AKAGI Hirofumi
2009 ( 21 ) 19 - 24 2009.1
-
Applications of a Modular Multilevel Converter to Medium-Voltage Motor Drives : Experimental Verification by a 400-V, 15-kW Laboratory System
NISHIMURA Kazutoshi, HAGIWARA Makoto, AKAGI Hirofumi
2009 ( 21 ) 19 - 24 2009.1
-
Calculation of DC magnetic flux deviation in the converter-transformer of a self-commutated BTB system during single-line-to-ground faults
Makoto Hagiwara, Phuong Viet Pham, Hirofumi Akagi
IEEE TRANSACTIONS ON POWER ELECTRONICS 23 ( 2 ) 698 - 706 2008.3
-
モジュラー・マルチレベル変換器(MMC)の分類と比較
萩原誠
平成20年電気学会産業応用部門大会 2008
-
モジュラー・マルチレベル変換器（MMC）のPWM制御法と動作検証
萩原誠, 赤木泰文
電気学会産業応用部門誌 128 ( 7 ) 957 - 965 2008
-
PWM control and experiment of modular multilevel converters
Makoto Hagiwara, Hirofumi Akagi
IEEJ Transactions on Industry Applications 128 ( 7 ) 13 - 965 2008
-
Dynamic behavior of a 21-level BTB-based power-flow controller under single-line-to-ground fault conditions
Makoto Hagiwara, Keiji Wada, Hideaki Fujita, Hirofumi Akagi
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 43 ( 5 ) 1379 - 1387 2007.9
-
Makoto Hagiwara, Keiji Wada, Hideaki Fujita, Hirofumi Akagi
ELECTRICAL ENGINEERING IN JAPAN 160 ( 1 ) 61 - 70 2007.4
-
HAGIWARA Makoto, PHAM Phuong Viet, AKAGI Hirofumi
IEEJ Transactions on Industry Applications 127 ( 9 ) 1013 - 1022 2007
-
Elucidation of DC Magnetic Deviation in Converter Transformers usedduring Single-Line-to-Ground Faults for a Self-Commutated BTB System
Makoto Hagiwara
127 ( 9 ) 1013 - 1022 2007
-
HAGIWARA Makoto, WADA Keiji, FUJITA Hideaki, AKAGI Hirofumi
IEEJ Transactions on Sensors and Micromachines 126 ( 3 ) 352 - 359 2006
-
A 21-Level (Line-to-Line) BTB System Based on Series Connection of Sixteen Converter Cells-Experimental Verifications by a 200-V, 20-kW Laboratory System-
Makoto Hagiwara, Keiji Wada, Hideaki Fujita, Hirofumi Akagi
IEEJ Transactions on Industry Applications 125 ( 4 ) 397 - 404 2005.9
-
An approach to regulating the dc-link voltage of a voltage-source BTB system during power line faults
M Hagiwara, H Akagi
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 41 ( 5 ) 1263 - 1271 2005.9
-
Dynamic Behaviors of a 21-Level (Line-to-Line) BTB System Based on Series Connection of Sixteen Converter-Cells under a Single-Line-to-Ground Fault Condition : Experimental Verifications by a 200-V, 20-kW Laboratory System
HAGIWARA Makoto, WADA Keiji, FUJITA Hideaki, AKAGI Hirofumi
2005 ( 21 ) 1 - 6 2005.1
-
HAGIWARA Makoto, WADA Keiji, FUJITA Hideaki, AKAGI Hirofumi
2005 ( 21 ) 1 - 6 2005.1
-
Experimental Verifications by a 200-V, 10-kW Multi-Level BTB System
HAGIWARA Makoto, FUJITA Hideaki, AKAGI Hirofumi
2004 ( 74 ) 81 - 86 2004.6
-
Experimental Verifications by a 200-V, 10-kW Multi-Level BTB System
HAGIWARA Makoto, FUJITA Hideaki, AKAGI Hirofumi
2004 ( 74 ) 81 - 86 2004.6
-
萩原誠
平成16年電気学会全国大会 2004
-
A Control Method for Regulating the DC Link Voltage of a Self-Commutated BTB System
Makoto Hagiwara, Hirofumi Akagi
IEEJ Transactions on Industry Applications 123 ( 1 ) 48 - 55 2003.9
-
M Hagiwara, H Akagi, H Fujita
ELECTRICAL ENGINEERING IN JAPAN 143 ( 3 ) 68 - 78 2003.5
-
Performance of a self-commutated BTB HVDC link system under a single-line-to-ground fault condition
M Hagiwara, H Fujita, H Akagi
IEEE TRANSACTIONS ON POWER ELECTRONICS 18 ( 1 ) 278 - 285 2003.1
-
Performance of a self-commutated BTB HVDC link system under a single-line-to-ground fault condition
Makoto Hagiwara, Hideaki Fujita, Hirofumi Akagi
IEEE Transactions on Power Electronics 18 ( 1 I ) 278 - 285 2003.1
-
A Self-Commutated BTB System and its Performance under a Single-Line-to-Ground Fault Condition
HAGIWARA Makoto, AKAGI Hirofumi, FUJITA Hideaki
IEEJ Transactions on Sensors and Micromachines 122 ( 3 ) 280 - 287 2002
Presentations
-
Applying Phase-Shift to Isolated DC-DC Converter Using Multiple Cascaded Chopper Cells
Lucas Morales Pablo, Makoto Hagiwara
2025 International Future Energy Electronics Conference
-
Control and Experimental Verification of Unidirectional 3-Phase AC/DC Power Converter Using Single-Delta Bridge-Cell Converter
Atsuya Suzuki, Makoto Hagiwara
2025 International Future Energy Electronics Conference
-
Output Power Feedback Control for DC-DC Converter Utilizing Singular Auxiliary Chopper Circuit
Nour AK Hamdan, Makoto Hagiwara
2025 International Future Energy Electronics Conference
-
Study on multilevel power conversion technologies for electric drives Invited
2025 12TH INTERNATIONAL CONFERENCE ON POWER AND ENERGY SYSTEMS ENGINEERING (CPESE2025) 2025.9
-
Effects of phase-locked-loop circuit on a self-commutated BTB system under line faults
IEEE Power Electronics Specialists Conference, 2008. 2008
-
PWM Control and Experiment of Modular Multilevel Converters
Proceedings of 2008 IEEE 39th Power Electronics Specialist Conference 2008
-
Effects of phase-locked-loop circuit on a self-commutated BTB system under line faults
IEEE Power Electronics Specialists Conference, 2008. 2008
-
PWM Control and Experiment of Modular Multilevel Converters
Proceedings of 2008 IEEE 39th Power Electronics Specialist Conference 2008
-
The Technical Possibilities of a Modular Multilevel PWM Inverter: A New Medium-Voltage Motor Drive for Energy Savings
The 8th International Conference on Power Electronics and Drive Systems 2009
-
Dynamic Behaviors of a 21-Level (Line-to-Line) BTB System Based on Series Connection of Sixteen Converter-Cells under a Single-Line-to-Ground Fault Condition : Experimental Verifications by a 200-V, 20-kW Laboratory System
2005
-
Dynamic Behaviors of a 21-Level (Line-to-Line) BTB System Based on Series Connection of Sixteen Converter-Cells under a single-line-to-ground Fault Condition
Proceedings of 2006 IEEE 41st Industrial Applications Society Annual Meeting 2006
-
Magnetic Saturations of in Transformers used for a Self-Commutated BTB System with Ride-Through Capability of Voltage Sags
Proceedings of 2006 IEEE 37th Power Electronics Specialist Conference 2006
-
Dynamic Behaviors of a 21-Level (Line-to-Line) BTB System Based on Series Connection of Sixteen Converter-Cells under a single-line-to-ground Fault Condition
Proceedings of 2006 IEEE 41st Industrial Applications Society Annual Meeting 2006
-
Magnetic Saturations of in Transformers used for a Self-Commutated BTB System with Ride-Through Capability of Voltage Sags
Proceedings of 2006 IEEE 37th Power Electronics Specialist Conference 2006
-
A Multi-Level BTB System for Power Flow Control between Transmission Networks
Proceedings of 2004 IEEE 39th Industrial Applications Society Annual Meeting 2004
-
Dynamic Behaviors of a 21-Level (Line-to-Line) BTB System Based on Series Connection of Sixteen Converter-Cells under a single-line-to-ground Fault Condition
Proceedings of 2005 International Power Electronics Conference 2005
-
An Approach to Regulating the DC-link Voltage in a Self-Commutated BTB Converter under Power System Faults
Proceedings of 2003 IEEE 37th Industrial Applications Society Annual Meeting 2003
-
A Multi-Level BTB System for Power Flow Control between Transmission Networks
Proceedings of 2004 IEEE 39th Industrial Applications Society Annual Meeting 2004
-
16段多重変換器を用いた自励式BTBシステムの一線地絡時における過渡特性 : 200V 20kWミニモデルを用いた実験的検討
電気学会 半導体電力変換研究会 2005
-
Dynamic Behaviors of a 21-Level (Line-to-Line) BTB System Based on Series Connection of Sixteen Converter-Cells under a single-line-to-ground Fault Condition
Proceedings of 2005 International Power Electronics Conference 2005
-
Performance of a Self-Commutated BTB System under a Single-Line-to-Ground Fault Condition
Proceedings of 2002 Power Conversion Conference 2002
-
An Approach to Regulating the DC-link Voltage in a Self-Commutated BTB Converter under Power System Faults
Proceedings of 2003 IEEE 37th Industrial Applications Society Annual Meeting 2003
-
Performance of a Self-Commutated BTB System under a Single-Line-to-Ground Fault Condition
Proceedings of 2002 Power Conversion Conference 2002
-
A Modular Multilevel PWM Inverter for Medium-Voltage Motor Drives
IEEE Energy Conversion Congress and Exposition 2009
-
The Technical Possibilities of a Modular Multilevel PWM Inverter: A New Medium-Voltage Motor Drive for Energy Savings
The 8th International Conference on Power Electronics and Drive Systems 2009
-
A Modular Multilevel PWM Inverter for Medium-Voltage Motor Drives
IEEE Energy Conversion Congress and Exposition 2009
Awards
-
IEEE Fellow
2026
-
電気学会 産業応用部門 論文査読促進賞
2025 電気学会
-
永守賞
2024
-
TPEL AE Excellence Award
2023
-
IEEE senior member
2019
-
東京工業大学 工学院創生的研究賞
2018
-
IEEE IAS IPCC Third Prize Paper Award
2016
-
IEEE IAS IPCC First Prize Paper Award
2014
-
IEEE IAS IPCC Third Prize Paper Award
2014
-
Isao Takahashi Power Electronics Award
2014
-
IEEE IAS IPCC First Prize Paper Award
2013
-
IEEE Transactions on Power Electronics' Outstanding Reviewers of 2013
2013
-
IEEE IAS IPCC First Prize Paper Award
2012
-
IPEC-Sapporo2010 Second Prize Paper Award
2010
-
IPEC-Sapporo2010 Second Prize Paper Award
2010
-
電気学会全国大会優秀論文発表賞
2009
-
電気学会産業応用部門優秀論文発表賞
2009
-
電気学会学術奨励賞
2001
Research Projects
-
各種マルチレベル電力変換器による基幹系統用疑似慣性変換器に関する研究
Grant number：2025-T01a 2026.2 - 2028.3
パワーアカデミー パワーアカデミー研究助成 特別推進研究
萩原 誠, 佐野 憲一朗, 柿ヶ野 浩明
Authorship：Principal investigator
-
電池電力貯蔵システムへの適用を目的としたコンデンサ絶縁型直流-直流変換器の研究
Grant number：25K01211 2025.4 - 2028.3
日本学術振興会 科学研究費助成事業 基盤研究(B)
萩原 誠
Grant amount：\18590000 （ Direct Cost: \14300000 、 Indirect Cost：\4290000 ）
-
電気自動車用超急速充電器への適用を目的とした絶縁型直流-直流変換器の研究
Grant number：22H01463 2022.4 - 2025.3
日本学術振興会 科学研究費助成事業 基盤研究(B)
萩原 誠
Grant amount：\15340000 （ Direct Cost: \11800000 、 Indirect Cost：\3540000 ）
-
移動体への適用を目的とした高電力密度・高効率化を同時に実現可能な革新的直流変換器の研究開発
2021
科学技術振興機構 産学が連携した研究開発成果の展開 研究成果展開事業 研究成果最適展開支援プログラム(A-STEP) トライアウト トライアウトタイプ(標準)
萩原 誠
Authorship：Principal investigator
本課題は、移動体へ適用される半導体電力変換技術に着目し、申請者が提案した高電力密度・大容量化を実現可能な直流変換器の高効率化手法(実現する技術)を検討する。上記変換器は複数の単位電力変換器から構成し、同一のスイッチング周波数で駆動する点に特徴があるが、損失増大により高効率化が困難という問題が存在した。本課題では各単位変換器の周波数を個別設定することで、実現可能性判断に必要な目標値である最高効率99%実現を目指す。目標値の実現可能性は、実験検証とシミュレーションにより明らかにする。本課題を解決することで、高電力密度・高効率化を同時に実現でき、輸送業界に対するイノベーションインパクトは極めて大きい。
-
High-power dc-dc converter for electric vehicles and electric aircraft
Grant number：19H02125 2019.4 - 2022.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Hagiwara Makoto
Grant amount：\13910000 （ Direct Cost: \10700000 、 Indirect Cost：\3210000 ）
This research outcome is expected to be applied to mobile bodies such as electric vehicles and electric aircrafts in the near future with a power rating of 100 kW. Attention is paid to large-capacity power electronics technology and a dc-dc converter that can realize small size, light weight, and low loss is proposed. The validity of the dc-dc converter is verified experimentally using a downscaled model and computer simulation using PSCAD, for contributing to the expansion of electrical vehicles and aircrafts, the improvement of the global environment, and the realization of a energy-saving society. It has been confirmed that the proposed dc-dc converter can achieve good steady and transient performance while achieving high efficiency and high power density.
-
Study of next-generation wind turbine generation systems based on multilevel converters
Grant number：26420223 2014.4 - 2017.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
Hagiwara Makoto
Grant amount：\5200000 （ Direct Cost: \4000000 、 Indirect Cost：\1200000 ）
The generator voltage of a cutting-edge wind turbine generation system (WTGS) is expected to increase from the conventional low-voltage level of 690 V to a medium-voltage level of 6.6 kV with a power level up to 10 MW without the
application of a parallel connection of multiple power units. This research project proposed a 10-MW WTGS consisting of a three-phase open-winding synchronous generator equipped with six lead terminals and three modular multilevel converters (MMCs) which are identical in terms of circuit configuration. The validity of the system has been confirmed by computer simulation using PSCAD software package along with experiment using a down-scaled system. Moreover, this research projects has proposed a new non-isolated dc-dc converter which can achieve reduction in size and weight of an inductor. The validity of the new dc-dc converter has been confirmed by a 150 V down-scaled system and computer simulation using PSCAD software package. -
Study of innovative high-power ac motor drive systems
Grant number：25249029 2013.4 - 2017.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
Akagi Hirofumi
Grant amount：\44720000 （ Direct Cost: \34400000 、 Indirect Cost：\10320000 ）
The aim of this research is to establish a core technology of high-efficiency and high-performance medium-voltage motor drives for large-capacity fans and compressors. From a practical point of view, this research takes up a modular multilevel DSCC inverter used for such motor drives. When the research was initiateted in 2013, no detailed discussions have been made on the driving and braking performance of synchronous and induction motors.
This research has designed, constructed, and tested a 400-V, 20-kW three-phase DSCC inverter consisting of eight cascaded chopper cells per arm. Experimental waveforms of the DSCC-based motor drives show satisfactory performance in adjustable-speed drives of the three-phase permanent magnet six-pole synchronous motor rated at 360 V，75Hz，and 15 kW, as well as the three-phase four-pole induction motor rated at 380 V, 50 Hz, and 15 kW. Other experimental waveforms of the induction-motor drive provides fast and safe dynamic-braking performance. -
Study on a motor drive using a modular multilevel converter
Grant number：23760255 2011 - 2012
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
HAGIWARA Makoto
Grant amount：\4420000 （ Direct Cost: \3400000 、 Indirect Cost：\1020000 ）
This study has dealt with a modular multilevel converter (MMC) that is considered as one of the next-generation multilevel converters with a focus on its applications to medium-voltage motor drives. The study has shown that the MMC can operate without using any dc-link capacitors connected between the common dc terminals. Moreover, it has proposed a control method to achieve stable operation at low speed without inducing any overvoltage and/or overcurrent. Moreover, a stable startup from the standstill to the nominal speed has been achieved by applying the common-mode voltage injection method developed in this study. The validity of the motor drive has been confirmed by experiment using a 400-V, 15-kW downscaled model.
-
Study of an Innovative Energy Storage SystemUsing New Secondary Battery Modules
Grant number：21246045 2009 - 2012
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
AKAGI Hirofumi, HAGIWARA Makoto, FUJITA Hideaki
Grant amount：\38870000 （ Direct Cost: \29900000 、 Indirect Cost：\8970000 ）
The aim of this research is to establish the core technology of the next-generation environment-friendly battery energy storage system that is characterized by combing the latest Li-ion battery modules with a modular multilevel cascade converter. The three-phase experimental system rated at 200 V, 10 kW, and 20 kWh was designed, constructed, and tested to confirm and justify the operating principles and stable performance of the battery energy storage system. As a result, a total harmonic distortion (THD) value of the line (supply) current complies completely with the Japanese harmonic guidelines. In addition, stable ride-through capability of the so-called “voltage sag” was confirmed by computer simulation under various voltage sag conditions.
-
Experimental verification of a three-phase modular multilevel converter
Grant number：21760213 2009 - 2010
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
HAGIWARA Makoto
Grant amount：\4420000 （ Direct Cost: \3400000 、 Indirect Cost：\1020000 ）
This research has dealt with a three-phase modular multilevel converter that is considered as one of the next-generation multilevel converter. This research has focused on its application to a medium-voltage motor drive with fans or blowers, in which the load torque is proportional to the square of the rotating speed. Also, this research has attempted to control negative-sequence reactive power by using a STATCOM based on the MMC. The validity of the motor drive and the STATCOM has been confirmed by experiment.
-
Study on the dynamic behavior of the self-commutated BTB system when different PLL circuits are applied
Grant number：19760193 2007 - 2008
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
HAGIWARA Makoto
Grant amount：\3780000 （ Direct Cost: \3300000 、 Indirect Cost：\480000 ）
-
Research on a Transformerless Hybrid Filter Capable of Direct Connection to Medium-Voltage Distribution Systems
Grant number：18360132 2006 - 2007
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
AKAGI Hirofumi, FUJITA Hideaki, HAGIWARA Makoto
Grant amount：\16300000 （ Direct Cost: \14800000 、 Indirect Cost：\1500000 ）
The aim of this research is to develop a hybrid active-passive filter capable of direct connection to medium-voltage utility and industrial power systems without transformers. This hybrid filter is intended for harmonic current compensation of a medium-voltage adjustable-speed motor drive for energy savings in pumps and blowers. Such a motor drive requires no regenerative braking, thus allowing the motor drive to use a three-diode rectifier as the front end. This research leads to the following findings:
1. The investigators have done feasibility study and conceptual design of a 6.6-kV transformerless hybrid filter suitable for a motor drive with a three-phase diode rectifier. This hybrid filter is characterized by series connection of a three-phase passive filter tuned In the seventh-harmonic frequency with a three-phase small-rated active filter using a three-level diode-clamped PWM converter without transformer.
2. The investigators have achieved theoretical analysis of harmonic current mitigation by the hybrid filter, with focus on the required volt-ampere ratings of the passive filter and the active filter Their ratings have a tradeoff in terms of harmonic current mitigation. Computer simulation has been carried out, considering the effects of control delay and the so-called "dead time." The theoretical analysis has been compared with the computer simulation. As a result, the validity of the theoretical analysis has been confirmed, and a limitation of the analysis has been revealed.
3. Taking into account the above-mentioned theoretical analysis and computer simulation, the investigators have deigned, constructed and tested a three-phase 400-V 15-kW downscaled system, where a three-level diode-clamped PWM converter has been used for the active filter. What is a major concern in introducing the three-level PWM converter into the hybrid filter is to keep the dc mean voltages of the two split dc capacitors balanced not only in steady states but also in transient states. The investigators have proposed a voltage-balancing control method for the hybrid filter The effectiveness and viability of the method has been verified by the experiments using the 400-V 15-kW system. The current THD (total harmonic distortion) in the supply side was less than 5%, and each harmonic current component was less than 3%, including up to 40-th harmonic components. Both the THD value and harmonic components perfectly meet the Japanese harmonic guidelines.
4. Considerations on the 6.6-kV transformerless hybrid filter that will be put into practical use in the near future have been discussed on the basis of the results from the theoretical analysis, computer simulation and experiment. -
自励式BTB(Back-To-Back)に関する研究
Grant number：04J50341 2004 - 2005
日本学術振興会 科学研究費助成事業 特別研究員奨励費
萩原 誠
Grant amount：\1900000 （ Direct Cost: \1900000 ）
自励式BTB(Back-To-Back)システムは,有効電力と無効電力の独立制御が達成できる,一線地絡等の系統事故時にも運転継続が可能である等優れた特長を有する電力変換器であり,次世代型電力伝送システムとして国内外問わず研究が行われている。研究代表者は100MWクラスの大容量電力変換器への適用を目的とした,16段多重変換器を用いた自励式BTBシステムの制御法や回路構成の提案を行い,研究室で設計・製作した200V,20kW試作システムを用いて実験的な検証を行っている。
研究代表者は,BTBシステムの正常動作時における動特性について試作システムを用いた検証を行い,十分な電源高調波成分の低減が実現できることを実証した。また,一線地絡時の運転継続に必要不可欠な3msという高速な電流制御が実現できることを示した。本研究成果は,電気学会論文誌産業応用部門誌2005年4月号にて掲載されている。
研究代表者は,次に一線地絡時における自励式BTBシステムの過渡特性について検討を行った。瞬時交流電圧ベクトルによる電源電圧の振幅・位相情報を用いると同時に,ディジタル制御系で発生する一サンプル遅延を補償する逆相電圧補償法を提案し,事故時の逆相電圧・逆相電流の抑制効果を確認している。更に,直流電圧変動や変圧器の磁気飽和現象に関する検討を行った。本研究成果は,電気学会論文誌産業応用部門誌2006年3月号にて掲載される予定である。