基于特征谐波的地铁直流馈线保护方法  

DC Feeder Protection Method for Subway Based on Characteristic Harmonic

作　　者：苏煜 汤士明 张子扬[3] SU Yu;TANG Shiming;ZHANG Ziyang(Hefei Rail Transit Group Limited Company,Hefei 230000,China;NR Electric Co.,Ltd.,Nanjing 210000,China;Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin 300072,China)

机构地区：[1]合肥轨道交通集团有限公司,安徽合肥230000 [2]南京南瑞继保电气有限公司,江苏南京210000 [3]天津大学智能电网教育部重点实验室,天津300072

出　　处：《河北电力技术》2023年第2期61-67,共7页Hebei Electric Power

基　　金：安徽省重点项目(2019AFCZ2101)。

摘　　要：通过分析地铁直流馈线上24次谐波的产生原因,以及直流馈线发生故障后24次谐波电流幅值的变化情况,提出一种基于24次特征谐波电流幅值的地铁直流馈线保护方法,依据故障后特征谐波幅值增大的原理来反映地铁直流馈线上发生的故障,并根据故障前有无车辆行驶设置了不同的保护判据,避免保护在升弓、过分段绝缘情况下误动作。最后得出了保护的动作判据、实现流程和整定值选取原则,并通过MATLAB/Simulink仿真验证了该保护方法可以正确识别直流馈线上的故障。This paper analyzes the cause of the 24th harmonic current in the DC feeder of subway as well as the change of the 24th characteristic harmonic current amplitude after a fault occurs.A protection method for DC feeder in subway is proposed based on the 24th harmonic current amplitude.The protection method is based on the principle that the amplitude of characteristic harmonic increases after a fault,which reflects the occurrence of a fault on the DC feeder of subway.This method sets different protection criteria according to whether the locomotive is running before the fault,to avoid the false operation of protection in the case of lifting the pantograph and passing the insulation.This paper provides the action criterion,implementation process,and setting value selection principle of the protection method,and the MATLAB/Simulink simulation verifies that the protection method can correctly identify faults on the DC feeder.

关 键 词：地铁牵引供电系统 直流馈线 馈线故障 特征谐波 继电保护 

分 类 号：TM773[电气工程—电力系统及自动化]