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基于短路比滚动评估的直流系统退出运行故障集建立方法

DOI: 10.13336/j.1003-6520.hve.2015.10.041, PP. 3484-3490

Keywords: 直流输电,短路比,支路开断分布因子,连锁故障,电压失稳,持续换相失败

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Abstract:

为评估交直流混联受端电网连锁故障引发直流系统持续换相失败的风险,提出了一种基于短路比滚动评估的直流系统退出运行故障集建立方法。该方法通过支路开断分布因子快速计算故障后其余线路的负载率,从而确定受线路开断潮流变化较大的线路作为后继故障线路;通过滚动计算每次故障后交流系统的短路比和有效短路比指标,当故障后受端电网短路比/有效短路比降低至阈值以下时判断直流系统退出运行,完成连锁故障集的构建。PSD-BPA程序仿真结果表明,河南电网发生建立的连锁故障后,短路比/有效短路比降低至2/1.5以下,±800kV哈郑直流发生持续换相失败,最终退出运行,验证了所提方法的有效性。

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