高压直流输电线路行波色散及行波测距研究  

Research on traveling wave dispersion and fault location for high voltage direct current transmission lines

作　　者：陈玉林 张杰 黄涛 张建锋 CHEN Yulin;ZHANG Jie;HUANG Tao;ZHANG Jianfeng(NR Electric Co.,Ltd,Nanjing 211106)

机构地区：[1]南京南瑞继保电气公司,南京211106

出　　处：《电气技术》2021年第12期8-13,共6页Electrical Engineering

基　　金：国网电力科学研究院有限公司科技项目(JS200448)。

摘　　要：针对长距离高压直流输电线路行波色散影响行波测距精度的问题,对某±800kV直流线路的行波色散现象进行仿真研究,得到10~3000km传输距离对应的电压行波和电流行波的色散波形,分析行波色散对行波测距的影响。为准确标定色散行波的波头到达时刻并准确修正行波波速,本文提出一种在时域标定行波波头时刻的方法,仿真分析不同传输距离时的“距离-时间偏差”曲线和“距离-等效波速”曲线。基于波速曲线采用多次迭代的方式进行行波测距,可实现高精度的直流线路行波测距。采用对装置样机进行波形回放的方式对本文所提方法进行试验验证,结果表明该方法的测距精度满足工程应用需求。Aiming at the problem of traveling wave dispersion and its adverse effects on traveling wave fault location(TWFL)for long distance high voltage direct current(HVDC)transmission line,a±800kV DC line,ranging from 10 km to 3000km,is simulated and the traveling wave dispersion and its influence on TWFL are analyzed.In order to accurately calibrate the arrival time and wave velocity of dispersive traveling wave,a novel time-domain calibration method is proposed.Based on this calibration method,the distance-time deviation curves and the distance-wave velocity curves are simulated and analyzed for different transmission distances.A TWFL method based on wave velocity curve and iterative calculation is offered to achieve high location accuracy.The method is proved to be accurate and practical by wave-replaying experiments on TWFL device prototypes.

关 键 词：高压直流输电线路 行波色散 行波测距 波头标定 行波波速 

分 类 号：TM75[电气工程—电力系统及自动化]