基于5G的配电网线路纵联电流差动保护零序补偿方法  

Zero-sequence compensation method of line longitudinal current differentialprotection based on 5G distribution network

作　　者：许瑞 於岳祥 李骁 金烨晨 赵舫[2] XU Rui;YU Yuexiang;LI Xiao;JIN Yechen;ZHAO Fang(Hangzhou Xiaoshan Power Supply Company,State Grid Zhejiang Electric Power Co.,Ltd.,Xiaoshan 311200,Zhejiang,China;School of Electrical Engineering,Zhejiang University,Hangzhou 310063,China)

机构地区：[1]国网浙江省电力有限公司杭州市萧山区供电有限公司,浙江萧山311200 [2]浙江大学电气工程学院,杭州310063

出　　处：《电测与仪表》2025年第4期105-112,共8页Electrical Measurement & Instrumentation

基　　金：国家重点研发计划项目(2017YFB0903100)。

摘　　要：针对配电网线路纵联电流差动保护回路异常故障影响正常供电的问题,提出一种基于5G的配电网线路纵联电流差动保护的零序补偿方法,提升不同故障情况的电流差动保护效果。依据基于5G的配电网特点构建配电网差动保护架构,结合差动保护的原理,分析不投入电容电流补偿和投入电容电流补偿两种保护动作下,基于5G的配电网中线路电容电流问题,并设置不同保护动作情况下的动作门槛值,完成纵联电流差动保护零序补偿。仿真实验结果表明不同故障类型下该方法均具备较好的电流差动零序补偿效果,补偿后电流差动变化小,电流波动最高幅度不超过150 A,且电流差动保护的灵敏性较高,能根据不同故障选择合适的差动保护动作。Aiming at the problem that the longitudinal current fault of distribution network lines affects the normal power supply,a zero-sequence compensation method of line longitudinal current differential protection based on 5G distribution network is proposed to improve the effect of current differential protection under different fault conditions.According to the characteristics of 5G distribution network,the differential protection architecture of distribution network is constructed.Combined with the principle of differential protection,the problem of line capacitive current in 5G distribution network under the two protection actions of no capacitive current compensation and capacitive current compensation is analyzed,and the action threshold under different protection actions is set to complete the zero-sequence compensation of longitudinal current differential protection.The experimental results show that the proposed method has good current differential zero-sequence compensation effect under different fault types.After compensation,the current differential change is small,the maximum amplitude of current fluctuation does not exceed 150 A,and the sensitivity of current differential protection is high.It can select appropriate differential protection action according to different faults.

关 键 词：基于5G的配电网 纵联电流 差动保护 零序补偿 故障分量差动 灵敏度 

分 类 号：TM933[电气工程—电力电子与电力传动]