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The power supply system is critical for ensuring stable and reliable operation of medium-voltage hybrid DC circuit breakers (MVDC CBs). Existing MVDC CBs predominantly employ cascaded power supply schemes. This paper conducts a comprehensive analysis of the cascaded power supply scheme's limitations in power supply capacity, efficiency, and cost. A cost-effective parallel distributed power supply solution was proposed. The overvoltage at power supply ports induced by high isolated voltage were evaluated through simulation and test. And the design boundaries for stable operation are quantified. Finally the parallel distributed power supply system successfully enabled the 30 kV breaker to pass full-sequence type tests and has been applied in the ± 30 kV MVDC power generation demonstration project in Dabancheng, Xinjiang, China.

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Design Method and Test Verification of Parallel Distributed Power Supply System for Medium Voltage Hybrid DC Circuit Breaker

  • 会议论文

  • 发表日期：

    2026年

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  • Fuyue Wen,
  • Huan Zhu,
  • Bo Zhou,
  • Pan Guo,
  • Qiangqiang Li,
  • Liang Luo,
  • Dongjie Zhang,
  • Yuefeng Yang

摘要

The power supply system is critical for ensuring stable and reliable operation of medium-voltage hybrid DC circuit breakers (MVDC CBs). Existing MVDC CBs predominantly employ cascaded power supply schemes. This paper conducts a comprehensive analysis of the cascaded power supply scheme's limitations in power supply capacity, efficiency, and cost. A cost-effective parallel distributed power supply solution was proposed. The overvoltage at power supply ports induced by high isolated voltage were evaluated through simulation and test. And the design boundaries for stable operation are quantified. Finally the parallel distributed power supply system successfully enabled the 30 kV breaker to pass full-sequence type tests and has been applied in the ± 30 kV MVDC power generation demonstration project in Dabancheng, Xinjiang, China.