基于零模行波S变换时频矩阵的配电网单相接地故障定位方法  

Accurate location method of single-phase-to-ground fault in distribution network based on zero-mode traveling-wave S-transform time-frequency matrix

作　　者：杨小磊 袁明哲 邹经鑫 YANG Xiaolei;YUAN Mingzhe;ZOU Jingxin(State Grid Sichuan Electric Power Company,Chengdu 610041,China;Chengdu Power Supply Company,State Grid Sichuan Electric Power Company,Chengdu 610042)

机构地区：[1]国网四川省电力公司,四川成都610041 [2]国网四川省电力公司成都供电公司,四川成都610042

出　　处：《电力科学与技术学报》2024年第4期93-101,共9页Journal of Electric Power Science And Technology

基　　金：国家电网有限公司科技项目(5400-202126143A-0-0-00)。

摘　　要：为提高配电网发生单相接地故障时的定位精度,提出一种基于电压零模行波S变换时频矩阵的选线和定位方法。首先,将各条馈线末端行波检测装置测得的行波信号解耦,得到故障电压零模行波;然后,在主馈线、一级和二级分支支路等特殊位置设置故障,得到对应故障位置的S变换时频矩阵,建立确定故障支路的对比库;最后,将故障零模电压行波S变换时频矩阵与对比库中数据进行相似度对比,确定单相接地故障发生的馈线和所在支路,针对不同性质支路选取适应性最优的定位方法,实现配电网单相接地故障的精确定位。仿真结果表明:该方法的定位准确度高,且无须全网配备行波检测装置便能够实现配电网单相接地故障的精确定位。To improve the accuracy of fault location in the case of single-phase grounding faults in distribution networks,a method for fault line selection and location based on the voltage zero-mode traveling-wave S-transform time-frequency matrix is proposed.First,the traveling-wave signals measured by the traveling-wave detection devices at the ends of each feeder are decoupled to obtain the fault voltage zero-mode traveling wave.Then,faults are set at special locations such as the main feeder,primary and secondary branch lines to obtain the S-transform time-frequency matrix corresponding to the fault location,and a comparison library for determining the fault branch is established.Finally,the S-transform time-frequency matrix of the fault zero-mode voltage traveling wave is compared with the data in the comparison library for similarity to determine the feeder and branch where the single-phase grounding fault occurs.The optimal location method is selected for different types of branches to achieve precise location of single-phase grounding faults in distribution networks.Simulation results show that this method has high accuracy in fault location and can achieve precise location of single-phase grounding faults in distribution networks without the need for traveling-wave detection devices across the entire distribution network.

关 键 词：配电网 行波定位 S变换 矩阵相似度 

分 类 号：TM862[电气工程—高电压与绝缘技术]