摘要
针对故障行波法受波速和线路弧垂影响而产生的定位精度问题,提出一种排除波速和不受线路实际长度变化影响的故障定位算法,该方法仅需检测初始行波到达线路两端的时间,原理简单。针对噪声情况下行波信号的提取问题,可先对故障行波进行变分模态分解(VMD)去噪,再利用小波变换提取故障行波突变点得到初始波头的时间。仿真结果表明,该方法具有较高的精确度。
For the problem that the location accuracy of traveling wave is affected by wave velocity and line sag,a fault location algorithm is proposed to eliminate the wave speed and not affected by the actual length of the line.This method only needs to detect the time when the initial traveling wave reaches both ends of the line,and the principle is simple.Aiming at the problem of extracting traveling wave signals under noisy conditions,the fault traveling wave can be denoised by variational mode decomposition(VMD),and then the wavelet transform can be used to extract the time of the initial wavehead from the fault traveling wave mutation point.Simulation results show that the method has high accuracy.
作者
王明会
朱浩钰
梁红敏
彭丹阳
WANG Minghui;ZHU Haoyu;LIANG Hongmin;PENG Danyang(North China University of Water Resources and Electric Power,Zhengzhou 450045,China;Water Supply Bureau of Heze Yellow River Bureau,Heze 274000,China)
出处
《电工技术》
2023年第1期16-18,共3页
Electric Engineering
关键词
行波检测
变分模态分解
故障定位
小波变换
traveling wave detection
variational modal decomposition
fault location
wavelet transform
