基于改进经验小波变换与双端行波判据的低压直流电缆故障定位方法  

Low-voltage DC Cable Fault Location Method Based on Improved Empirical Wavelet Transform

作　　者：董墨庭 刘鸿鹏 张书鑫 DONG Moting;LIU Hongpeng;ZHANG Shuxin(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology,Ministry of Education,Northeast Electric Power University,Jilin Jilin 132012)

机构地区：[1]现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林吉林132012

出　　处：《东北电力大学学报》2024年第5期94-100,共7页Journal of Northeast Electric Power University

基　　金：国家自然科学基金(52207189)。

摘　　要：为提高低压直流电缆故障定位精度,文中提出了一种改进的经验小波变换(Improved Empirical Wavelet Transform,IEWT)与改进双端行波故障判据结合的方法。该方法首先利用双端行波法获取电缆两端的电流信号;然后利用IEWT将电流信号分解为各级本征模态函数(Intrinsic Mode Function,IMF)并重构,对分解后的IMF分量进行筛选以有效避免模态混叠现象的出现;最后利用峭度规则检测筛选得到的IMF分量,并通过改进的双端行波故障判据计算确定故障点的位置。仿真结果表明,该方法具有较高的定位精度和可靠性,能够满足工程实践的要求。To improve the accuracy of low-voltage DC cable location,an improved empirical wavelet transform(IEWT)method and an improved double-end traveling wave criterion method are proposed.This method first uses the double-end traveling wave method to obtain the current signals at both ends of the faulty cable,and then decomposes and reconstructs the current signal through IEWT to obtain processed intrinsic mode function(IMF)components,which are screened to effectively avoid mode mixing in the decomposition of complex noise signals.Finally,the selected IMF components are detected using kurtosis rules,and the position of the fault point is determined by using the improved double-end traveling wave fault criterion.Simulation results show that this method has high accuracy and meets the requirements of engineering practice for location.

关 键 词：低压直流电缆 故障定位 双端行波 改进经验小波变换 峭度 

分 类 号：TM726[电气工程—电力系统及自动化]