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柔性直流电网直流线路故障的过电压机理分析
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1.南方电网能源发展研究院有限责任公司;2.新能源电力系统国家重点实验室(华北电力大学)

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Analysis on the Overvoltage Mechanism of DC Line Faults in Flexible DC Grid
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State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources (NCEPU)

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    摘要:

    针对对称单极结构的MMC型柔性直流输电系统,深入分析了直流侧单、双极短路的故障电流演变规律,从而揭示了非故障极充电和波过程是分别导致单、双极短路故障过电压的主要原因。然后,以一个三端柔直电网为例进行仿真验证,并重点分析了不同因素对过电压的影响。研究结果表明,故障电阻对过电压峰值影响较大,而换流站闭锁、接地方式、线路保护等因素的影响较小。最后,对单、双极故障过电压进行了总结和对比分析。

    Abstract:

    For MMC-based flexible DC grid with symmetric monopolar topology, this paper studies the evolution law of fault currents of single pole to ground fault and bipolar fault, and thus reveals that non-faulted line charging and fault waves are respectively the main reasons for the overvoltage of single pole to ground fault and bipolar fault. Then, a three-terminal flexible DC grid is used for simulation and verification, and the influences of different factors on overvoltage are analyzed. The results show that the fault resistance has a great effect on the peak value of the overvoltage, while the converter blocking, grounding scheme and line protection have little effect. Finally, the overvoltage of single pole to ground fault and bipolar fault are summarized and compared.

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李岩,黄豫,龚雁峰,等.柔性直流电网直流线路故障的过电压机理分析[J].电力系统自动化. DOI:10.7500/AEPS20190425008.

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历史
  • 收稿日期:2019-04-25
  • 最后修改日期:2020-01-16
  • 录用日期:2019-10-10
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