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

作　　者：廖成操 周晶[1] 罗日成[2] LIAO Chengcao;ZHOU Jing;LUO Richeng(State Grid Hunan Electric Power Company Limited,Huaihua Power Supply Company,Huaihua 418000,China;School of Electrical and Information Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[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

出　　处：《电力学报》2024年第5期398-404,共7页Journal of Electric Power

基　　金：湖南省教育厅科研基金项目(23A0240);长沙市自然科学基金项目(kq2402023)。

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。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 ensemble 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 ranging.A lightning protection model for 35 kV transmission lines is built in ATP-EMTP software.The method is simulated and analyzed using theαmode current obtained by decoupling the phase current signal.The simulation results show that,the proposed method restrains the mode aliasing phenomenon,has a good detection effect 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-EMTP 

分 类 号：TM75[电气工程—电力系统及自动化]