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Aiming at the problem that the reliability of impedance-based fault ranging methods is seriously reduced due to the access of a high percentage of inverter-type distributed power sources (IIDG) to the distribution network, this paper proposes a sparse measurement point-based fault ranging method for distribution networks containing inverter-type distributed power sources. The proposed method is based on the node impedance matrix. It takes into account the control strategy of IIDG, obtains the fault current from the fault sequence network, reduces the unknowns of fault ranging, and constructs the ranging equations to solve the fault distances in the three-phase network. The method does not require source impedance and utilizes information from a small number of measurement points with arbitrarily selectable locations to determine the exact location of the fault. Simulation tests verify the algorithm's effectiveness on a distribution network model containing IIDGs, and the simulation results show high locating accuracy for any asymmetrical short-circuit fault.

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Accurate Fault Location in Distribution Networks Containing Inverter-Based Distributed Power Supplies Based on Sparse Measurements

  • 会议论文

  • 发表日期：

    2025年

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  • Jinghan He,
  • Changxia Gao,
  • Meng Li,
  • Jingtao Zhao,
  • Wenqiang Xie,
  • Ruihuang Liu

摘要

Aiming at the problem that the reliability of impedance-based fault ranging methods is seriously reduced due to the access of a high percentage of inverter-type distributed power sources (IIDG) to the distribution network, this paper proposes a sparse measurement point-based fault ranging method for distribution networks containing inverter-type distributed power sources. The proposed method is based on the node impedance matrix. It takes into account the control strategy of IIDG, obtains the fault current from the fault sequence network, reduces the unknowns of fault ranging, and constructs the ranging equations to solve the fault distances in the three-phase network. The method does not require source impedance and utilizes information from a small number of measurement points with arbitrarily selectable locations to determine the exact location of the fault. Simulation tests verify the algorithm's effectiveness on a distribution network model containing IIDGs, and the simulation results show high locating accuracy for any asymmetrical short-circuit fault.