Location of Asymmetric Ground Fault Using Virtual Injected Current Ratio and Two-stage Recovery Strategy in Distribution Networks  

作　　者：Haiting Shan Luliang Zhang Q.H.Wu Mengshi Li 

机构地区：[1]School of Electric Power Engineering,South China University of Technology(SCUT),Guangzhou 510641,China

出　　处：《CSEE Journal of Power and Energy Systems》2024年第1期151-161,共11页中国电机工程学会电力与能源系统学报（英文）

基　　金：supported in part by Key-Area Research and Development Program of Guangdong Province(No.2020B010166004);State Key Program of National Natural Science Foundation of China under Grant(No.U1866210);Natural Science Foundation of Guangdong Province(No.2022A1515011587).

摘　　要：Sparse measurements challenge fault location in distribution networks.This paper proposes a method for asymmetric ground fault location in distribution networks with limited measurements.A virtual injected current vector is formulated to estimate the fault line,which can be reconstructed from voltage sags measured at a few buses using compressive sensing(CS).The relationship between the virtual injected current ratio(VICR)and fault position is deduced from circuit analysis to pinpoint the fault.Furthermore,a two-stage recovery strategy is proposed for improving reconstruction accuracy of the current vector,where two different sensing matrixes are utilized to improve the incoherence.The proposed method is validated in IEEE 34 node test feeder.Simulation results show asymmetric ground fault type,resistance,fault position and access of distributed generators(DGs)do not significantly influence performance of our method.In addition,it works effectively under various scenarios of noisy measurement and line parameter error.Validations on 134 node test feeders prove the proposed method is also suitable for systems with more complex structure.

关 键 词：Distribution networks fault location reconstruction accuracy two-stage recovery virtual injected current ratio 

分 类 号：TM71[电气工程—电力系统及自动化]