基于行波法的配网混合线路故障定位研究  

Research on fault location of hybrid lines for distribution network based on travelling wave method

作　　者：罗玉鹤 白文博 舒恺 张洁 裴梓翔 范天成 LUO Yuhe;BAI Wenbo;SHU Kai;ZHANG Jie;PEI Zixiang;FAN Tiancheng(Ningbo Electric Power Design Institute Co.,Ningbo 315000,Zhejiang China)

机构地区：[1]宁波市电力设计院有限公司,浙江宁波315000

出　　处：《中南民族大学学报（自然科学版）》2024年第4期567-572,共6页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：浙江省科技型中小企业技术创新基金(LY21E070023)。

摘　　要：为实现配网混合线路故障的精准定位,提出了一种行波极性判断与单端故障定位提取相结合的方法.首先,基于小波变换模极大值的方法,计算不同区段的行波电流极性,确定故障点所在的区间;接着,仿真计算故障区间内的行波波速,并基于小波变换提取波头时间,实现混合线路的故障定位;最后,在10kV动模试验平台搭建混合线路故障模型,开展不同影响因素的定位精度研究.研究结果表明:当采样频率和故障初相角增加时,定位精度也会逐步增加;故障区段为电力电缆时,定位精度优于架空线路的故障区段;该方法可精准地实现故障定位,具有一定的推广意义.In order to achieve accurate fault location of hybrid lines in distribution network,it is proposed that a method combining traveling wave polarity judgment and single-end fault location extraction.Firstly,based on the method of wavelet transform mode maximum,the polarity of traveling wave current in different sections was calculated,and the interval where the fault point was located was determined.Then,the traveling wave velocity in the fault interval was calculated by simulation,and the wave head time was extracted based on wavelet transform to realize the fault location of the hybrid line.Finally,a hybrid line fault model was built on the 10 kV dynamic model test platform,and the positioning accuracy of different influencing factors was studied.The results show that when the sampling frequency and initial fault phase Angle increase,the positioning accuracy will gradually increase.When the fault section is power cable,the positioning accuracy is better than that of the fault section of the overhead line.The method presented in this paper can accurately achieve fault location,and has a certain extension significance.

关 键 词：行波法 混合线路 故障定位 动模试验 小波变换 

分 类 号：TM732[电气工程—电力系统及自动化]