电力系统保护与控制2025，Vol.53Issue(18)：97-108,12.DOI:10.19783/j.cnki.pspc.241577
基于双电流突变量比值的含光伏电源低压配电网触电故障检测和定位方法
Electric shock fault detection and positioning method for low-voltage distribution networks with PV power supply based on the ratio of dual-current mutant amount
摘要
Abstract
In low-voltage distribution networks with distributed photovoltaic(PV)integration,residual current waveforms are complex and their amplitudes vary randomly.This often leads to frequent maloperation of existing residual current protection devices,making them difficult to apply effectively.To address this issue,a dual-criterion approach is proposed,combining the ratio of the mutation values of residual current and repeated grounding current with the residual current setting threshold.First,the composition and variation of residual current in a TN-C-S system with PV power supply under electric shock faults are analyzed,considering increasing numbers of repeated grounding points and loads.Based on this,a threshold for the ratio of the residual current and repeated grounding current mutation is established as fault detection criterion.Then,the influence of repeated grounding points on the diversion of electric shock current is examined,and a method for fault location is proposed using the average value of the mutation ratio.Simulation results verify that the proposed criteria can accurately detect electric shock faults,demonstrate strong anti-interference capability,effectively reduce maloperation of protection devices,and achieve accurate positioning of fault sections under different fault positions.关键词
光伏电源/低压配电网/剩余电流/生物触电/故障定位Key words
PV power supply/low-voltage distribution network/residual current/human electric shock/fault location引用本文复制引用
李军,朱劲涛,张玉琼,吕干云,刘克天,黄嘉伟..基于双电流突变量比值的含光伏电源低压配电网触电故障检测和定位方法[J].电力系统保护与控制,2025,53(18):97-108,12.基金项目
This work is supported by the Key Project of Science and Technology Innovation Special Fund of Jiangsu Province(No.BE2022003). 江苏省科技创新专项基金重点项目资助(BE2022003) （No.BE2022003）
