摘要
中性点非有效接地的矿山高压供电系统发生单相接地故障后,故障暂态过程交叉干扰严重,故障信号呈现出很强的非线性、非平稳性、高时变性和复杂性,故障定位难度很大。针对此难题,提出了一种基于分布散度的故障区段定位方法。首先,通过等效电路分析了故障特性,研究并采用Choi-Williams分布(Choi-Williams Distribution,CWD)时频能量谱克服故障信号中多频率成分交叉干扰。然后,采用改进KL散度表征故障区段上下游信号时频分布差异,处理上下游信号CWD时频能量谱中重叠部分,消除故障区段上下游信号相似成分的不利影响。在此基础上,借助零序电流信号CWD-KL散度构建了故障定位判据。最后,仿真测试与对比分析验证了所提方法的有效性与优越性。
After a single-phase-to-earth fault occurs in a mining high-voltage power supply system with non-effectively grounded neutral points,the transient process of the fault has severe cross interference,and the fault signal exhibits strong nonlinearity,non stationarity,high time variability and complexity,making fault localization difficult.To address this problem,a fault location method based on distribution divergence was proposed.Firstly,the fault characteristics were analyzed through an equivalent circuit,and the Choi-Williams Distribution(CWD)time-frequency energy spectrum was used to overcome the cross interference of multiple frequency components in the fault signal.Then,an improved KL divergence was proposed to characterize the time-frequency distribution difference between the upstream and downstream signals in the fault section,and the overlapping parts in the CWD time-frequency energy spectrum of upstream and downstream signals were processed to eliminate the adverse effects of similar components in the upstream and downstream signals of the fault section.On this basis,the fault location criterion was constructed by using the CWD-KL divergence of zero sequence current signal.Finally,the feasibility and superiority of the proposed method were verified by simulation test and comparative analyses.
作者
史鹏飞
张龙飞
何俊涛
李凯歌
刘鹏辉
Shi Pengfei;Zhang Longfei;He Juntao;Li Kaige;Liu Penghui(Henan Baoyushan Coal Industry Co.,Ltd.,Luoyang 471322,China;School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454000,China)
出处
《能源与环保》
2024年第4期165-171,共7页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
河南省自然科学基金(232300420301)
河南省科技攻关计划项目(212102210248)。
关键词
矿山供电系统
中性点非有效接地
单相接地故障
分布散度
故障定位
mine power supply system
non-effectively grounded neutral points
single-phase-to-earth fault
distribution divergence
fault location
