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Many high-order harmonics generated in the grid-connected operation of the new energy power generation system easily cause the series and parallel harmonic resonance of the power distribution network. The harmonic resonance may cause frequent tripping of the circuit breaker on the side of the grid-connected inverter due to the protection of the grid-connected inverter itself or the distribution network. The high-order harmonics distort the voltage and current waveform of the power grid and reduce the ability of the circuit breaker to break the fault current. In this paper, the MHD simulation method is used to study the arc extinguishing characteristics of low-voltage circuit breakers with high harmonics. The results show that the arc current has a higher current drop rate before zero-crossing in the case of a high harmonic current. Moreover, as the frequency of the harmonic current increases, there is a significant rise in the temperature of the back-arc region within the interrupter chamber, potentially leading to re-ignition accidents after the arc has been initially extinguished.

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Research on Breaking Arc Characteristics of Circuit Breakers on The Side of Grid-connected Inverters for New Energy Sources

  • 会议论文

  • 发表日期：

    2026年

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  • Hong Wang,
  • Guokai Zhang,
  • Kun Wang,
  • Gengshen Tian,
  • Xianjiang Yang,
  • Lei Huang,
  • Hongliang Zhang,
  • Xiaonan Li,
  • Weiben Yang

摘要

Many high-order harmonics generated in the grid-connected operation of the new energy power generation system easily cause the series and parallel harmonic resonance of the power distribution network. The harmonic resonance may cause frequent tripping of the circuit breaker on the side of the grid-connected inverter due to the protection of the grid-connected inverter itself or the distribution network. The high-order harmonics distort the voltage and current waveform of the power grid and reduce the ability of the circuit breaker to break the fault current. In this paper, the MHD simulation method is used to study the arc extinguishing characteristics of low-voltage circuit breakers with high harmonics. The results show that the arc current has a higher current drop rate before zero-crossing in the case of a high harmonic current. Moreover, as the frequency of the harmonic current increases, there is a significant rise in the temperature of the back-arc region within the interrupter chamber, potentially leading to re-ignition accidents after the arc has been initially extinguished.