基于互补经验模态分解法的高压直流输电线路故障测距  

Fault Location for High Voltage Direct Current Transmission Lines Based on Complementary Ensemble Empirical Mode Decomposition

作　　者：邹红波[1,2] 伏春林 高沈清 ZOU Hongbo;FU Chunlin;GAO Shenqing(College of Electrical Engineering&New Energy,China Three Gorges Univ.,Yichang 443002,China;Hubei Provincial Collaborative Innovation Center for New Energy Microgrid,China Three Gorges Univ.,Yichang 443002,China;State Grid Bazhong Power Supply Company,Bazhong 636600,China;Shanghai Lanke Environmental Technology Co.,Ltd.,Shanghai 201800,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]三峡大学新能源微电网湖北省协同创新中心,湖北宜昌443002 [3]国家电网巴中市供电公司,湖北巴中636600 [4]上海蓝科石化环保科技股份有限公司,上海201800

出　　处：《三峡大学学报（自然科学版）》2021年第2期93-99,共7页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金面上项目(61876097)。

摘　　要：高压直流输电(HVDC)线路发生接地故障,故障点会产生向线路两侧传播的行波.对测量行波的首个波头到达监测时间点的准确识别,能决定线路故障定位的精度.考虑到故障行波的非线性、非平稳、多模态的特征,传统方法是采用希尔伯特黄变换(HHT)的方法:首先利用经验模态分解(EMD)或集成经验模态分解(EEMD)进行模态解析,分解成若干个本征模态函数(FIM),然后对首个FIM分量进行希尔伯特变换标定波头的具体时间点.但是,EMD法存在着分解分量过平滑和模态混叠的问题,EEMD法存在着分解分量噪声残余过大而淹没故障信息的问题.为了解决该问题,本文利用互补经验模态分解法(CEEMD)代替传统EMD和EEMD法对故障行波进行分析.PSCAD仿真和Matlab数据分析表明,该方法能实现线路故障的准确定位,并且受过渡电阻的影响较小.If a grounding fault happens in the high voltage direct current(HVDC)lines,the traveling wave will be generatedin the fault point and propagated to both sides of the line.The accurate identification which the head of the first wave for the measured travelling wave arrived to the monitoring time point is more important because it can determine the accuracy of the fault location.Considering the nonlinear,non-stationary and multimodal characteristics of the fault traveling wave,the algorithm of Hilbert-Huang transform(HHT)is adopted for fault location in the traditional method.In the method of HHT,firstly,the modal analysis is performed on the original signal by using empirical mode decomposition(EMD)or ensemble empirical mode decomposition(EEMD),which is decomposed into several intrinsic mode functions(FIM).Then the specific time points of the wave head in the first FIM component are calibrated through the Hilbert transform.However,the method EMD has the troubles that the decomposition component is too smooth and the mode aliasing happens.Moreover,the algorithm EEMD has the problems that the residual noise of the decomposition component is too large and the fault information is covered.In order to solve the problems,the complementary ensemble empirical mode decomposition method(CEEMD)is adopted in this paper instead of the traditional methods of EMD and EEMD to analyze the fault traveling wave.The simulations in the software PSCAD and the data analysis in Matlab show that the proposed method can realize the accurate location of line fault and is less affected by the transition resistance.

关 键 词：高压直流输电 故障定位 互补经验模态分解 行波波头 线路故障 

分 类 号：TM75[电气工程—电力系统及自动化]