李振兴;甘涛;陈艳霞;翁汉琍;李振华;

• 1:三峡大学电气与新能源学院
• 2:国网北京市电力公司电力科学研究院
• 3:梯级水电站运行与控制湖北省重点实验室(三峡大学)

摘要(Abstract)：

高压线路保护动作会同时启动失灵保护,如果电流互感器存在拖尾电流将引起失灵保护误动。基于此提出一种基于Fréchet距离算法的拖尾电流识别方法,以避免失灵保护误动。该方法利用拖尾电流与故障电流波形形态差异,选定短数据窗采样电流序列内起始点与终点构成模板直线,并得到模板直线过零时刻与起始点的时差△t,进而计算归一化后电流序列与模板直线序列之间的Fréchet距离值,融合Dt与距离值补集构成拖尾电流识别判据。该方法原理简单,不受故障电流直流分量和CT饱和的影响,易于实现,仿真结果验证了它的可靠性与抗干扰性。

关键词(KeyWords)： 失灵保护;拖尾电流;电流互感器;图形相似度;Fréchet距离算法

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51607106);; 三峡大学学位论文培优基金项目(2019SSPY064)~~

作者(Author): 李振兴;甘涛;陈艳霞;翁汉琍;李振华;

Email:

DOI: 10.13335/j.1000-3673.pst.2020.0341

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