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In the multi-terminal DC power grid, three or more DC circuit breakers (DCCBs) may be required on the DC bus, which worsens the disadvantages of DCCBs in economy and volume. This paper proposes a multi-port DCCB (MPDCCB) that utilizes a full bridge inverter to assist current resonance. Compared to other MPDCCBs that use mechanical switches for current flow, the proposed MPDCCB has the characteristic of low on-state loss. It only uses a few semiconductor devices, which significantly reduces costs. According to the designed parameters, the proposed MPDCCB has a current interruption capacity of 320 kV/12 kA. A simulation model has been established in PSCAD/EMTDC to verify its interruption performance. The simulation results show that the proposed MPDCCB topology can reliably isolate faults and maintain energy transfer of normal operation lines during the interruption.

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A Low-Cost and Low-Loss Multi-Port Incremental Oscillating DC Circuit Breaker

  • 会议论文

  • 发表日期：

    2025年

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  • Yanfeng Wang,
  • Mengze Yu,
  • Liuhuo Wang,
  • Ziao Yuan,
  • Siyuan Liu

摘要

In the multi-terminal DC power grid, three or more DC circuit breakers (DCCBs) may be required on the DC bus, which worsens the disadvantages of DCCBs in economy and volume. This paper proposes a multi-port DCCB (MPDCCB) that utilizes a full bridge inverter to assist current resonance. Compared to other MPDCCBs that use mechanical switches for current flow, the proposed MPDCCB has the characteristic of low on-state loss. It only uses a few semiconductor devices, which significantly reduces costs. According to the designed parameters, the proposed MPDCCB has a current interruption capacity of 320 kV/12 kA. A simulation model has been established in PSCAD/EMTDC to verify its interruption performance. The simulation results show that the proposed MPDCCB topology can reliably isolate faults and maintain energy transfer of normal operation lines during the interruption.