直流牵引供电系统故障测距的新方法  

A new method of fault location for DC traction power supply system

作　　者：高沁翔[1] 贾明泽 陈赛慧[1] 

机构地区：[1]北京交通大学电气工程学院,北京100044

出　　处：《北京交通大学学报》2015年第5期39-43,共5页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

摘　　要：城市轨道交通牵引供电系统快速准确的故障定位,对地铁正常运营具有重要意义.在PSCAD/EMTDC中搭建双边供电方式下的仿真模型,考虑集肤效应下的牵引供电系统短路故障,采用MUSIC功率谱的方法提取双端故障行波的固有频率中的主频率进行测距.经仿真验证:本文方法解决了集肤效应对故障测距精度的影响问题,与基于稳态分量的阻抗分析法或行波法等测距方法相比,该方法不受波速与线路参数测量误差的影响,提高了现有方法的测距精度,具有一定的应用前景.The fast and accurate fault location of traction power supply system for urban rail transportation is of great significance for normal operation of metro station. In this paper,PSCAD /EMTDC is used to build bilateral power supply simulation model,which considered the skin effect of short circuit fault in traction power supply system. Then the method of MUSIC power spectrum is adopted to extract the main frequency of natural frequency from double terminal traveling wave to locate the fault.The simulation results show that this method has solved the effect of skin effect to the ranging accuracy.Compared with ranging method based on the steady- state component impedance analysis method and traveling wave method,it is not affected by the influence of the measurement error of wave velocity and line parameters. It greatly improves the ranging accuracy of the existing methods. So it has a certain application prospect.

关 键 词：牵引供电系统 集肤效应 固有频率 故障测距 

分 类 号：TM77[电气工程—电力系统及自动化]