作者：刘伟鑫¹, 周松斌², 刘忆森¹, 韩威¹, 张宏钊³

作者单位：1. 广东省智能制造研究所 广东省现代控制与光机电技术公共实验室, 广东 广州 510070;
2. 广东省智能制造研究所 广东省现代控制技术重点实验室, 广东 广州 510070;
3. 广东工业大学自动化学院, 广东 广州 510006

关键词：行波故障测距;局部均值分解;输电线路;测距精度

摘要：

针对当前输电线路行波故障测距存在波速不确定性与行波波头到达时间难以准确测量问题，提出一种基于局部均值分解（local mean decomposition，LMD）的行波故障测距方法，该方法在传统双端测距线路中间增加一个测量点，利用无故障线段的长度和测量点检测波头时间求出输电线路的行波波速，有效消除波速对测距精度的影响；利用LMD算法对行波故障电流线模分量进行分解，根据分解得到第一个分量PF瞬时频率曲线的首个频率突变点准确测量行波波头到达时间。采用Simulink搭建输电线路仿真模型，将该文行波故障测距方法与小波变换测距、HHT变换测距方法（Hilbert-Huang transform，HHT）进行仿真对比，结果表明：该文方法测距精度高于小波变换测距、HHT变换测距方法，对实际输电线路故障测距具有重要应用价值。

Traveling wave fault location measurement method based on LMD

LIU Weixin¹, ZHOU Songbin², LIU Yisen¹, HAN Wei¹, ZHANG Hongzhao³

1. Public Laboratory of Modern Control and Optics-Mechanics-Electricity Technology, Guangdong Institute of Intelligent Manufacturing, Guangzhou 510070, China;
2. Key Laboratory of Modern Control Technology, Guangdong Institute of Intelligent Manufacturing, Guangzhou 510070, China;
3. Faculty of Automation, Guangdong University of Technology, Guangzhou 510006, China

Abstract: In view of the problem of the wave velocity uncertainty and the inaccurate measurement of the arrival time of initial traveling wave in travelling wave fault location measurement of transmission line, a traveling wave fault location measurement method based on local mean decomposition(LMD) is proposed in this paper. It can eliminate the influence of wave velocity to fault location measurement by adding a measurement point in the middle of the traditional Double-Ended Traveling Wave and calculating the traveling wave velocity with the length of fault-free line segment and the time that the initial wave is tested at the measurement point. The local mean decomposition is applied to decompose the line mode component of measured current wave, and the arrival time of the initial traveling wave can be detected according to the first sudden arising of frequency in the instantaneous curve of the first PF obtained through LMD. The transmission line simulation model of the Simulink is established in the paper. The results of the simulation comparison conducted for LMD, Wavelet Transform and Hilbert-Huang Transform (HHT) show that LMD has higher fault location measurement accuracy than the schemes based on either wavelet transform or Hilbert-Huang transform and it has a certain reference value to transmission line fault location measurement in practice.

Keywords: travelling wave fault location;LMD;transmission line;location accuracy

2017, 43(9): 42-46  收稿日期: 2017-03-15;收到修改稿日期: 2017-04-29

基金项目: 广东省科技计划资助项目（2015B090901025，2016B090918061）

作者简介: 刘伟鑫(1992-),男,广东揭阳市人,助理工程师,主要从事测控系统技术集成与应用。

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