祁晓敏;孔力;裴玮;李鲁阳;

• 1:中国科学院电工研究所
• 2:中国科学院大学

摘要(Abstract)：

多端交直流混合配电网中,交流系统对直流故障特性的影响机理是影响系统保护设计的重要因素。针对多端交直流混合配电网直流线路发生故障后,交流系统对短路电流的影响和贡献开展全面研究。首先,详细分析了直流线路发生极间短路故障后的故障电流特性及交流系统对故障电流的贡献。在此基础上,推导了交流系统贡献电流的解析表达式,提出了交流系统贡献电流的稳态平均值、暂态峰值以及峰值时间的实用计算方法,所提方法显著简化了系统短路电流的计算。最后,对所提方法进行了仿真研究,仿真结果表明故障发生时刻对交流系统贡献短路电流特性的影响很小,所提方法在不同过渡电阻和故障距离时都能保证较高精度,证明了所提计算方法的正确性。

关键词(KeyWords)： 交直流混合配电网;直流故障;交流系统;短路电流;影响机理

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目(2017YFB0903300)~~

作者(Author): 祁晓敏;孔力;裴玮;李鲁阳;

Email:

DOI: 10.13335/j.1000-3673.pst.2017.3003

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