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Employment (4)

Toshiba (Japan): Tokyo, Tokyo, JP

2025-04-01 to present | Manager (Infrastructure Systems R&D Center, Corporate Laboratory)
Employment
Source: Self-asserted source
Yushi Koyama

Institute of Science Tokyo: Tokyo, JP

2017 to present | Part-time Lecturer (School of Engineering)
Employment
Source: Self-asserted source
Yushi Koyama

Toshiba Infrastructure Systems & Solutions Corporation: Tokyo, JP

2018-10-01 to 2025-03-31 | Manager (Infrastructure Systems Research and Development Center)
Employment
Source: Self-asserted source
Yushi Koyama

Toshiba (Japan): Tokyo, Tokyo, JP

2007-04-01 to 2018-09-30 (Power and Industrial Systems Research and Development Center)
Employment
Source: Self-asserted source
Yushi Koyama

Education and qualifications (3)

University of Tsukuba: Tsukuba, JP

2016-04-01 to 2019-03-25 | Doctor of Philosophy (Applied Physics)
Education
Source: Self-asserted source
Yushi Koyama

Tokyo Institute of Technology: Tokyo, JP

2005-04-01 to 2007-03-31 | Master of Science (Energy Science)
Education
Source: Self-asserted source
Yushi Koyama

Tokyo Institute of Technology: Tokyo, JP

2003-04-01 to 2005-03-31 | Bachelor of Science (Electrical and Electronic Engineering)
Education
Source: Self-asserted source
Yushi Koyama

Professional activities (2)

Institute of Electrical Engineers of Japan: Tokyo, JP

Membership
Source: Self-asserted source
Yushi Koyama

IEEE: New York, NY, US

Membership
Source: Self-asserted source
Yushi Koyama

Works (17)

Universal Design Methodology for Multiline Hybrid HVDC Circuit Breakers Based on Generalized Circuit Topology

IEEE Transactions on Power Electronics
2024-10 | Journal article
DOI: 10.1109/TPEL.2024.3420932
Contributors: Yushi Koyama; Shinnosuke Hamajima; Takahiro Ishiguro
Source: check_circle
Crossref

Bridge-Type Hybrid HVDC Circuit Breaker with Reduced Semiconductor Devices

2024 IEEE Applied Power Electronics Conference and Exposition (APEC)
2024-02-27 | Conference paper
DOI: 10.1109/apec48139.2024.10509191
Contributors: Shinnosuke Hamajima; Yushi Koyama; Takahiro Ishiguro
Source: Self-asserted source
Yushi Koyama

Fault Handling Method in an HVDC System with Half-Bridge MMCs and Hybrid DC Circuit Breakers

2023 IEEE Energy Conversion Congress and Exposition (ECCE)
2023-10-29 | Conference paper
DOI: 10.1109/ecce53617.2023.10362068
Contributors: Mitsuyoshi Enomoto; Kenichiro Sano; Yushi Koyama; Kei Sekiguchi; Takahiro Ishiguro; Daichi Suzuki
Source: Self-asserted source
Yushi Koyama

DC Fault Ride-Through Control of Half-Bridge MMCs for the HVDC Grid with DC Circuit Breakers

IEEJ Journal of Industry Applications
2023-05-01 | Journal article
DOI: 10.1541/ieejjia.22006950
Part of ISSN: 2187-1094
Part of ISSN: 2187-1108
Contributors: Atsushi Chiba; Kenichiro Sano; Yushi Koyama; Kei Sekiguchi; Takahiro Ishiguro; Daichi Suzuki
Source: Self-asserted source
Yushi Koyama

A DC Fault Ride-Through Control of Half-Bridge MMCs for the HVDC Grid with DC Circuit Breakers

2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)
2022-05-15 | Conference paper
DOI: 10.23919/ipec-himeji2022-ecce53331.2022.9807072
Part of ISBN: 9781665416313
Contributors: Atsushi Chiba; Kenichiro Sano; Yushi Koyama; Kei Sekiguchi; Takahiro Ishiguro
Source: Self-asserted source
Yushi Koyama

Generalized Circuit Topology and Classification of Multiline Hybrid HVDC Circuit Breakers

2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)
2022-05-15 | Conference paper
DOI: 10.23919/ipec-himeji2022-ecce53331.2022.9807173
Part of ISBN: 9781665416313
Contributors: Yushi Koyama; Shinnosuke Hamajima; Takahiro Ishiguro
Source: Self-asserted source
Yushi Koyama

Technical Development Report: a Hybrid DC Circuit Breaker for Multiterminal HVDCs

IEEJ Transactions on Industry Applications
2022-02-01 | Newsletter article
DOI: 10.1541/ieejias.142.nl2_7
Part of ISSN: 0913-6339
Part of ISSN: 1348-8163
Contributors: Yushi Koyama
Source: Self-asserted source
Yushi Koyama

Current Control of Modular Multilevel Converters Using a Daisy-Chained Distributed Control System with Communication Path Redundancy

IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society
2019-10-15 | Conference paper
DOI: 10.1109/iecon.2019.8926654
Part of ISBN: 9781728148786
Contributors: Yushi Koyama; Takanori Isobe
Source: Self-asserted source
Yushi Koyama

Multi-line Hybrid DC Circuit Breaker with Low Conduction Loss and Reduced Semiconductor Breaker

European Conference on Power Electronics and Applications
2019-09-03 | Conference paper
DOI: 10.23919/epe.2019.8915486
Part of ISBN: 9789075815313
Contributors: Yushi Koyama; Ryuichi Morikawa; Takahiro Ishiguro
Source: Self-asserted source
Yushi Koyama

Operation and Experimentation of a Current Commutated Hybrid DC Circuit Breaker for HVDC Transmission Grids

IEEJ Journal of Industry Applications
2019-09-01 | Journal article
DOI: 10.1541/ieejjia.8.835
Part of ISSN: 2187-1094
Part of ISSN: 2187-1108
Contributors: Yushi Koyama; Ryuta Hasegawa; Kazuhisa Kanaya; Toshiaki Matsumoto; Takahiro Ishiguro
Source: Self-asserted source
Yushi Koyama

単位電力変換器を多直列接続したカスケード・マルチレベル変換器の性能向上に関する研究

Doctoral thesis
2019-03-25 | Dissertation or Thesis
DOI: 10.15068/00156630
Contributors: Yushi Koyama
Source: Self-asserted source
Yushi Koyama

Current control of modular multilevel converters with phase‐shifted pwm using a daisy‐chained distributed control system

IEEJ Transactions on Electrical and Electronic Engineering
2019-03-14 | Journal article
DOI: 10.1002/tee.22905
Part of ISSN: 1931-4973
Part of ISSN: 1931-4981
Contributors: Yushi Koyama; Takanori Isobe
Source: Self-asserted source
Yushi Koyama

A Transformerless 6.6-kV STATCOM Based on a Hybrid Cascade Multilevel Converter Using SiC Devices

IEEE Transactions on Power Electronics
2018-09 | Journal article
DOI: 10.1109/TPEL.2017.2770143
Contributors: Yushi Koyama; Yosuke Nakazawa; Hiroshi Mochikawa; Atsuhiko Kuzumaki; Kenichiro Sano; Naotaka Okada
Source: check_circle
Crossref

Principle Experiment of Current Commutated Hybrid DCCB for HVDC Transmission Systems

International Power Electronics Conference
2018-05-20 | Conference paper
DOI: 10.23919/IPEC.2018.8507918
Contributors: Ryuta Hasegawa; Yushi Koyama; Kazuhisa Kanaya; Toshiaki Matsumoto; Takahiro Ishiguro
Source: Self-asserted source
Yushi Koyama

One-Pulse Control for STATCOM with Delta-Connected Modular Multilevel Converter

IEEJ Transactions on Industry Applications
2017-03-01 | Journal article
DOI: 10.1541/ieejias.137.246
Part of ISSN: 0913-6339
Part of ISSN: 1348-8163
Contributors: Yushi Koyama; Ryuta Hasegawa; Takuro Arai; Daichi Suzuki
Source: Self-asserted source
Yushi Koyama

One-pulse control for modular multilevel converter based STATCOM

European Conference on Power Electronics and Applications
2016-09-05 | Conference paper
DOI: 10.1109/EPE.2016.7695351
Contributors: Yushi Koyama; Takuro Arai; Ryuta Hasegawa; Daichi Suzuki
Source: Self-asserted source
Yushi Koyama

System fault test of SiC device applied 6.6kV transformerless D-STATCOM

European Conference on Power Electronics and Applications
2015-09-08 | Conference paper
DOI: 10.1109/EPE.2015.7309063
Contributors: Yushi Koyama; Yosuke Nakazawa; Hiroshi Mochikawa; Atsuhiko Kuzumaki; Naotaka Okada; Kenichiro Sano
Source: Self-asserted source
Yushi Koyama
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