改进的HHT方法在小电流接地选线中的应用  

Application of improved HHT method in non-solidly earthed line detection

作　　者：商立群[1] 赵佳佳 王江宁[1,3] 

机构地区：[1]西安科技大学电气与控制工程学院,陕西西安710054 [2]榆林供电局,陕西榆林719000 [3]天水供电局,甘肃天水741000

出　　处：《电工电能新技术》2013年第2期116-120,共5页Advanced Technology of Electrical Engineering and Energy

基　　金：陕西省教育厅科研计划资助项目(12JK0568)

摘　　要：HHT(Hilbert-Huang Transform)的核心EMD能将复杂的信号自适应地分解成若干个具有物理意义的单分量信号,但是在其实现的过程中会产生端点效应,使得分解的模态分量严重失真,极大地影响了故障选线的准确性。基于此,本文通过采用自适应波形匹配的端点延拓法对其进行改进,然后运用改进的HHT方法对小电流接地系统的故障选线进行仿真验证。结果表明改进的HHT法不仅有效地抑制了端点效应问题,而且提高了单相接地故障选线的准确率。Hilbert-Huang Transform （HHT）, a kind of new methods, deals with nonlinear and non-stationary sig-nal. The core of HHT is named EMD, which can self-decompose complicated signals into a set of single-component signals , each of which has physical sense. But when using the EMD to dispose the nonlinear and non-stationary sig-hal, the EMD will produce endpoint effects which make the decomposed modal component serious distortion, then affecting the accuracy of the fault line greatly. Based on this, the paper uses a self-adaptive waveform matching ex- tending method to improve the HHT algorithm, and then builds the non-solidly earthed system simulation model, which is used to test the effect of applying improved HHT detection method to detect the fault line. The simulation test showed that the improved method not only effectively inhibits the endpoint effect of HHT, but also improves the accuracy rate of one-phase ground fault location.

关 键 词：改进的HHT 自适应波形匹配 小电流接地 故障选线 

分 类 号：TM862[电气工程—高电压与绝缘技术]