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Wind farm connected to grid via diode rectifier unit and modular multilevel converter (DRU-MMC) cascading system, as a competitive option for long-distance transmission of large-scale wind power, is required of fault ride-through (FRT) ability. However, lack of high-speed communication makes it difficult to timely notify the numerous, multi-type converters of fault location and correctly coordinate them. To this end, a coordinated FRT control method based on harmonic injection is proposed. Upon a fault occurs, the converter closest to fault detects the voltage drop and injects the massage harmonic to other converters. A series of sequence harmonics are designed to represent different location of fault, including the AC gathering network, DC gathering network, DC transmission lines and AC receiving grid. And the detailed control loops for different converters are furtherly constructed. The proposed method enables rapid DC voltage limitation and power regulation of the DRU–MMC system without the need for communication. Simulation results confirm that the method delivers satisfactory performance under various fault conditions and locations.

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Coordinated Fault Ride Through Control Using Harmonic Injection for DRU-MMC Connected Wind Farms

  • 会议论文

  • 发表日期：

    2026年

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  • Yuanzhen Li,
  • Yanan Wu,
  • Lin Zhu,
  • Jun Yan,
  • Guokang Yu,
  • Shuhua Zhang,
  • Wei Tian,
  • Qi Zhou

摘要

Wind farm connected to grid via diode rectifier unit and modular multilevel converter (DRU-MMC) cascading system, as a competitive option for long-distance transmission of large-scale wind power, is required of fault ride-through (FRT) ability. However, lack of high-speed communication makes it difficult to timely notify the numerous, multi-type converters of fault location and correctly coordinate them. To this end, a coordinated FRT control method based on harmonic injection is proposed. Upon a fault occurs, the converter closest to fault detects the voltage drop and injects the massage harmonic to other converters. A series of sequence harmonics are designed to represent different location of fault, including the AC gathering network, DC gathering network, DC transmission lines and AC receiving grid. And the detailed control loops for different converters are furtherly constructed. The proposed method enables rapid DC voltage limitation and power regulation of the DRU–MMC system without the need for communication. Simulation results confirm that the method delivers satisfactory performance under various fault conditions and locations.