基于EEMD算法的站端行波测距方法
Traveling Wave Ranging Method at Station End Based on EEMD Algorithm
廖成操 1周晶 1罗日成2
作者信息
- 1. 国网湖南省电力公司 怀化供电公司,湖南 怀化 418000
- 2. 长沙理工大学 电气与信息工程学院,长沙 410114
- 折叠
摘要
针对传统故障信号波头检测方法误差较大导致故障定位精度低的问题,提出了一种基于集合经验模态分解(ensemble empirical mode decomposition,EEMD)与双端行波测距相结合的输电线路雷击故障点定位方法.首先,将故障信号进行EEMD处理,得到多个本征模函数;其次,将分解得到的第一阶本征模函数作为突变检测分析信号,并确定故障行波到达线路两端测量点的时刻;最后,结合检测到的两端故障初始行波到达时刻与双端行波测距求得故障点的具体位置.在ATP-EMTP软件中搭建了35 kV输电线路雷电绕击模型,选取相电流信号解耦后的α模电流对该方法进行仿真分析.仿真结果表明,所提方法抑制了模态混叠现象,具有较好的行波波头检测效果及较高的故障定位精度.
Abstract
Aiming at the problem that the traditional fault signal wave head detection method has large error,which leads to low fault location accuracy,a lightning fault location method for transmission lines based on en-semble empirical mode decomposition(EEMD)and two-terminal traveling wave ranging is proposed.Firstly,the fault signal is decomposed into multiple intrinsic mode function(IMF)by EEMD.Secondly,the first-order IMF obtained by decomposition is used as the signal of mutation detection and analysis,and the time when the fault traveling wave reaches the measurement points at both ends of the line is determined.Finally,the specific location of the fault point is obtained based on the formula of arrival time and two-terminal traveling wave rang-ing.A lightning protection model for 35 kV transmission lines is built in ATP-EMTP software.The method is simulated and analyzed using the α mode current obtained by decoupling the phase current signal.The simula-tion results show that,the proposed method restrains the mode aliasing phenomenon,has a good detection ef-fect of traveling wave head,and high fault localization accuracy.
关键词
输电线路/故障定位/集合经验模态分解/双端行波测距/ATP-EMTPKey words
transmission line/fault location/ensemble empirical mode decomposition/two-terminal traveling wave ranging/ATP-EMTP引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据