洋上風力を連系する直流送電システムにおけるハーフブリッジMMCを用いた直流短絡事故の保護手法

カテゴリ：部門大会

論文No：012

グループ名：【B】令和7年電気学会電力・エネルギー部門大会

発行日：2025/9/5

タイトル(英語)：A Protection Method for DC Pole-to-Pole Faults Using a Half-Bridge MMC in HVDC Transmission Systems for Offshore Wind Farms

著者名：若月圭眞（東京科学大学），佐野憲一朗（東京科学大学）

著者名(英語)： Keima Wakatsuki (Institute of Science Tokyo), Kenichiro Sano (Institute of Science Tokyo)

キーワード：直流グリッド,直流極間短絡事故,ハーフブリッジMMC,下アーム短絡,アームリアクトル,HVDC grid,dc pole-to-pole fault,half-bridge MMC,lower arm short,arm inductor

要約(日本語)：This paper proposes a fault protection method for offshore terminals in HVDC transmission systems that connect offshore wind farms to onshore ac grids. Conventional protection methods use dc circuit breakers or ac short-circuit switches to interrupt fault currents. However, these methods require additional equipment, which increases costs and reduces system reliability. The proposed method introduces a novel half-bridge modular multilevel converter (HB-MMC) as the offshore converter, in which the lower arm inductors are relocated to the upper arm. In the event of a dc fault, this converter can suppress the fault current to zero by operating in a mode referred to as lower arm short protection. The proposed method can be implemented by partially reconfiguring the HB-MMC and does not require additional dc circuit breakers or ac short-circuit switches. Therefore, it offers advantages in terms of both cost and reliability to conventional methods. The validity of the proposed method is verified by simulations.

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