2022 Fiscal Year Final Research Report
A Study on Application of MMC to Wind Turbines in Offshore DC Systems
| Project/Area Number |
20K04453
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 21010:Power engineering-related
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 洋上風力発電 / 直流送電 / MMC |
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| Outline of Final Research Achievements |
By using a modular multilevel converter (MMC) as an ac converter for offshore wind turbines, it is possible to reduce the size and weight of the converter in a wind turbine to one, and thus reduce its size and cost. This study clarifies the control method when an MMC is applied to an ac-dc converter in a wind turbine. Specifically, an experiment was conducted in which a single-stage MMC was connected to a synchronous machine used as a generator to perform the ac-dc conversion. The rotation speed of the synchronous machine was controlled at 400 rpm, and the torque was varied from 0 Nm to 1 Nm using an induction machine.
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| Free Research Field |
パワーエレクトロニクス
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| Academic Significance and Societal Importance of the Research Achievements |
洋上風力発電では，高い導入ポテンシャルを有する地域において，電力会社が新たな再生可能エネルギーの連系を保留する事態が続いている。この問題の解決策の一つとして，電力消費の多い地域に直流で送電する方法が検討されている。洋上風力発電の電力を直流で集電して送る場合，洋上風力発電機に交直変換器が必要となる。本研究で得られた成果をもとに，交直変換器にMMCの適用することで高い昇圧比を実現でき，後段のDC-DCコンバータを取り除くことで構成がシンプルとなり，小型・軽量化やコスト低減が期待できる。
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