基于多脉冲注入法的高压直流输电接地极线路故障测距  

A Fault Location Method for HVDC Grounding Pole Line Using Multi-Pulse Injection Method

作　　者：廖名洋 张文[1] 袁海[1] 曾海涛 LIAO Mingyang;ZHANG Wen;YUAN Hai;ZENG Haitao(Guangzhou Bureau of CSG EHV Power Transmission Company,Guangzhou 510640,Guangdong,China)

机构地区：[1]中国南方电网超高压输电公司广州局,广东广州510640

出　　处：《电网与清洁能源》2022年第9期98-104,111,共8页Power System and Clean Energy

基　　金：南方电网超高压输电公司科技项目(CGYKJXM-20180435)。

摘　　要：分析了脉冲信号在高压直流输电接地极线路上的传播过程以及脉冲信号的选择,避免单一脉冲的测距盲区影响故障测距,根据脉冲注入法的单端测距原理提出了一种利用多宽度脉冲注入法的直流输电接地极线路故障测距方法。该方法通过宽度为8μs的脉冲周期性地检测接地极线路的运行状态,在判断线路发生故障后,通过4μs和2μs的脉冲分别探测故障的位置,最后取平均值得到测距结果。PSCAD/EMTDC仿真结果表明,该方法在直流系统双极运行或单极运行状态下,能够满足工程上对故障测距误差精度的要求,且避免了故障电阻的影响、减小了因选取宽脉冲而造成的大范围测距盲区,在保证反射脉冲高识别度的情况下提高了线路测距精度。In this paper,the propagation process of the pulse signal on HVDC grounding pole line and the selection of the pulse signal are analyzed to avoid the blind zone of single pulse affecting the fault location.A fault location method for HVDC grounding pole line using multi-pulse injection method is presented according to the single-end distance measurement principle of the pulse injection method.This method is to detect the running states of the grounding electrode lines by the plus of8μs periodically.When the line fault is determined,the fault location is detected by the plus of 4μs or 2μs.Finally,the fault location result is obtained in the form of the average value.The PSCAD/EMTDC simulation results show that this method can locate faults both in bipolar and unipolar operation of the DC system,and can meet the engineering requirements for error accuracy,avoid the influence of transition resistance,reduce the large range of ranging blind area caused by wide pulse selection,and improve line ranging while ensuring high recognition of the reflected pulse.

关 键 词：高压直流输电 接地极线路 脉冲注入法 单端测距 

分 类 号：TM77[电气工程—电力系统及自动化]