基于VMD和Wigner-Ville分布的局放信号时频分析

doi:10.16182/j.issn1004731x.joss.201802025

摘要/Abstract

摘要： 为分析高压电器设备局放信号基于时域和频域的联合特性,提出了一种基于变分模态分解(Variational Mode Decomposition,VMD)和Wigner-Ville分布(VMD-WVD)的局放信号的联合时频分析方法,有效解决了Wigner-Ville分布中交叉项干扰问题。对局放信号进行VMD分解,得到若干单一成分的模态分量;分别计算各模态分量的Wigner-Ville分布,将结果线性叠加得到局放信号的Wigner-Ville分布。采用该方法对仿真和实测放电信号进行分析,实验结果表明该方法既能有效抑制Wigner-Ville分布的交叉项,又能保证较高的能量聚集性和很好的时频分辨率。

关键词: 局部放电, Wigner-Ville分布, 变分模态分解, 时频分析

Abstract: To effectively analyze the time-frequency characteristics of partial discharge signals of high voltage electrical equipment, a novel time-frequency analysis method based on variational mode decomposition (VMD) and Wigner-Ville distribution (VMD-WVD) was proposed, which effectively solves the problem of cross term interference in the Wigner-Ville distribution method. The known partial discharge signals were decomposed by VMD and the mode components were extracted. These Wigner-Ville distributions of mode components were computed and the Wigner-Ville of each component signal was added linearly to reconstruct the Wigner-Ville of the original signal. The proposed method was applied to analyze simulation signals and measured partial discharge signal. The time-frequency results of the proposed method effectively restrain the cross terms of Wigner-Ville distribution, and guarantee a high energy aggregation and good time-frequency resolution. Its merit of proposed method shows that VMD-WVD is an effective time-frequency distribution for analyzing partial discharge signals.

Key words: partial discharge, Wigner-Ville distribution, variational mode decomposition, time frequency analysis

中图分类号:

TM85

贾亚飞, 朱永利, 王刘旺. 基于VMD和Wigner-Ville分布的局放信号时频分析[J]. 系统仿真学报, 2018, 30(2): 569-578.

Jia Yafei, Zhu Yongli, Wang Liuwang. Time-frequency Analysis of Partial Discharge Signal Based on VMD and Wigner-Ville Distribution[J]. Journal of System Simulation, 2018, 30(2): 569-578.

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