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A valve-side ground fault in the converter station of an MMC-HVDC system presents a significant risk to power system security. This chapter examines the prevalent single-phase-to-ground (SPG) fault characteristics on the valve side of onshore converter stations within OWF-MMC-HVDC systems. It explores how these onshore SPG faults propagate and impact offshore HVDC transmission lines, offshore converter stations, and wind farms, all within the framework of MMC control principles. To mitigate these risks, the chapter proposes an overvoltage suppression strategy that utilizes zero-sequence voltage modulation. The strategy’s impact on the system’s transient stability is analyzed, and key parameters are designed with a balance between practical engineering considerations and system performance. The theoretical analysis of fault characteristics and the effectiveness of the proposed overvoltage suppression strategy are validated using the PSCAD/EMTDC simulation platform. The simulation results closely match the theoretical analysis, demonstrating the strategy’s effectiveness in mitigating overvoltage issues.

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Characteristics Analysis and Suppression of Onshore Valve-Side Fault

  • 章节

  • 发表日期：

    2025年

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  • Wei Yao,
  • Hongyu Zhou,
  • Yongxin Xiong,
  • Jinyu Wen

摘要

A valve-side ground fault in the converter station of an MMC-HVDC system presents a significant risk to power system security. This chapter examines the prevalent single-phase-to-ground (SPG) fault characteristics on the valve side of onshore converter stations within OWF-MMC-HVDC systems. It explores how these onshore SPG faults propagate and impact offshore HVDC transmission lines, offshore converter stations, and wind farms, all within the framework of MMC control principles. To mitigate these risks, the chapter proposes an overvoltage suppression strategy that utilizes zero-sequence voltage modulation. The strategy’s impact on the system’s transient stability is analyzed, and key parameters are designed with a balance between practical engineering considerations and system performance. The theoretical analysis of fault characteristics and the effectiveness of the proposed overvoltage suppression strategy are validated using the PSCAD/EMTDC simulation platform. The simulation results closely match the theoretical analysis, demonstrating the strategy’s effectiveness in mitigating overvoltage issues.