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The increasing demand for efficient and reliable DC distribution networks has heightened the significance of DC circuit breakers (DCBs) in power systems. This study introduces a novel resonant-current-controlled arcless soft switching DC circuit breaker (RASS-DCCB) topology with controllable current injection, designed to enhance circuit breaker performance in medium-voltage DC systems. The use of thyristors to replace traditional fully-controlled semiconductor switching devices, and the fault current clearing capability of the circuit breaker are validated through simulation. This paper emphasizes the thyristor reverse recovery characteristics and their implementation in RASS-DCCB, proposing optimization strategies to improve the circuit breaker’s breaking speed and turn-off safety. The findings suggest that the proposed RASS-DCCB holds promising potential for application in medium-voltage DC distribution networks.

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Research on a Novel All-Thyristor-Type RASS-DCCB

  • 会议论文

  • 发表日期：

    2026年

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  • Zhang Yao,
  • Cai Xiang,
  • Chang Shiyang,
  • Li Qun,
  • Chen Shi,
  • Wang Tonglei,
  • Pang Lei

摘要

The increasing demand for efficient and reliable DC distribution networks has heightened the significance of DC circuit breakers (DCBs) in power systems. This study introduces a novel resonant-current-controlled arcless soft switching DC circuit breaker (RASS-DCCB) topology with controllable current injection, designed to enhance circuit breaker performance in medium-voltage DC systems. The use of thyristors to replace traditional fully-controlled semiconductor switching devices, and the fault current clearing capability of the circuit breaker are validated through simulation. This paper emphasizes the thyristor reverse recovery characteristics and their implementation in RASS-DCCB, proposing optimization strategies to improve the circuit breaker’s breaking speed and turn-off safety. The findings suggest that the proposed RASS-DCCB holds promising potential for application in medium-voltage DC distribution networks.