串补高压输电线路故障位置识别新方法  

A New Method for Identifying the Fault Location on High Voltage Transmission Line with Series Compensator

作　　者：徐子华[1] 王艳松[1] 王敬海[2] 

机构地区：[1]中国石油大学(华东)信息与控制工程学院,山东青岛266580 [2]潍坊供电公司,山东潍坊261041

出　　处：《电网与清洁能源》2013年第3期1-6,11,共7页Power System and Clean Energy

基　　金：山东省自然基金项目(ZR2012EEL20);中国石油大学(华东)研究生创新工程资助项目(CX-1246)~~

摘　　要：基于小波分析理论,提出了一种串补高压输电线路相对于串补电容的故障点位置识别方法。通过仿真采集输电线路不同位置故障时的双端故障电流,应用小波分析对故障电流的奇异性进行分析,对比各频段小波分解系数的奇异性变化规律,寻找出一种可以用于识别相对于串补电容位置的故障点特征量。该方法仅利用MOV导通前的一段时间的电流信号,避开了MOV导通后串补电容上电压难以获得的问题。大量PSCAD/EMTDC仿真表明,该方法简单,运行速度快,准确率高,不受电压等级、串补度、故障类型、故障距离、过渡电阻、故障起始时刻等随机因素的影响。A new method for identifying the fault location relative to the series capacitor on the series compensated line is proposed in this paper. Firstly, the double end current is measured when the fault occurs at different positions in the transmission line. Secondly, the wavelet analysis is used to analyze the singularity of the fault current signal; and the singularity variation rules of decomposition coefficients of each band wavelet are compared to find out the characteristic quantity by which the fault location relative to the series capacitor can be identified. In order to avoid the nonlinear influence of the MOV, only the data before the MOV operation is used. The PSCAD/EMTDC simulation shows that this method is able to accurately locate the fault at a high speed and is free from the influence of the random factors such as fault type, fault transition resistance, fault distance and fault inception time etc.

关 键 词：输电线路 串联补偿 小波分析 氧化锌非线性电阻 故障位置识别 

分 类 号：TM711[电气工程—电力系统及自动化]