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The line commutated converter-based high voltage direct current (LCC-HVDC) can support long-distance and large-capacity transmission, so it has attracted wide attention in research. Commutation failure, as one of its common faults, will harm the transmission process once it occurs. Therefore, this paper analyzes the mechanism of single and multiple commutation failures. When two commutation failures occur, the characteristics of valve current, valve voltage and direct current (DC) voltage are obtained. Based on the summary of commutation failure characteristics, a fault diagnosis strategy that can detect commutation failure quickly and accurately is proposed. By leveraging real-time monitoring and the unique features of commutation failures, the strategy ensures timely fault detection and intervention, minimizing damage and maintaining stable power flow.

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A Novel Fault Diagnosis Strategy of LCC-HVDC Commutation Failure

  • 会议论文

  • 发表日期：

    2025年

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  • Fangjie Wu,
  • Ming Li,
  • Xiaolin Shen,
  • Shangan Du,
  • Xiaohan Yu,
  • Yiqi Liu

摘要

The line commutated converter-based high voltage direct current (LCC-HVDC) can support long-distance and large-capacity transmission, so it has attracted wide attention in research. Commutation failure, as one of its common faults, will harm the transmission process once it occurs. Therefore, this paper analyzes the mechanism of single and multiple commutation failures. When two commutation failures occur, the characteristics of valve current, valve voltage and direct current (DC) voltage are obtained. Based on the summary of commutation failure characteristics, a fault diagnosis strategy that can detect commutation failure quickly and accurately is proposed. By leveraging real-time monitoring and the unique features of commutation failures, the strategy ensures timely fault detection and intervention, minimizing damage and maintaining stable power flow.