Analysis of Power Quality Perturbation Based on Combination of EMD Denoising and S-transform

SUN Ke; ZHANG Xinyan; LEI Leixiao; LI Jianwei

doi:10.14044/j.1674-1757.pcrpc.2021.06.019

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Analysis of Power Quality Perturbation Based on Combination of EMD Denoising and S-transform

更新时间：2024-09-14

- Analysis of Power Quality Perturbation Based on Combination of EMD Denoising and S-transform
- POWER CAPACITOR & REACTIVE POWER COMPENSATION Vol. 42, Issue 6, Pages: 127-133(2021)
- 作者机构：
  
  新疆大学电气工程学院
- 作者简介：
- 基金信息：
- DOI：10.14044/j.1674-1757.pcrpc.2021.06.019
  CLC： TM711
- Published：2021，
- 稿件说明：
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SUN KE, ZHANG XINYAN, LEI LEIXIAO, et al. Analysis of Power Quality Perturbation Based on Combination of EMD Denoising and S-transform. [J]. Power capacitor & reactive power compensation, 2021, 42(6): 127-133.
DOI：

SUN KE, ZHANG XINYAN, LEI LEIXIAO, et al. Analysis of Power Quality Perturbation Based on Combination of EMD Denoising and S-transform. [J]. Power capacitor & reactive power compensation, 2021, 42(6): 127-133. DOI： 10.14044/j.1674-1757.pcrpc.2021.06.019.

摘要

针对电能质量扰动分析问题

提出了一种基于改进EMD去噪和S变换结合的电能质量分析方法。对所获取信号进行EMD分解

选取其中高频信号IMF分量进行小波阈值去噪

依次重构高频信号IMF分量和原信号

对重构信号做S变换处理

提取电能质量扰动特征

根据S变换的时间、频率、幅值等特征分析电能质量扰动具体情况

判断扰动时间和扰动类型。仿真实验结果表明

通过改进EMD去噪和S变换的结合

可有效去除信号中的噪声分量

提高噪声干扰下电能质量扰动分析的准确率。

Abstract

Aiming at the analysis of power quality perturbation

a kind of power quality analysis method based on the combination of improved EMD denoising and S-transform is proposed. The obtained signal is decomposed by EMD and the IMF component of high-frequency signal is selected for wavelet threshold denoising. The IMF component of high-frequency signal and the original signal are reconstructed in sequence. The reconstructed signal is processed by S-transform so to extract the characteristics of power quality perturbation. The specific power quality perturbation is analyzed in accordance with such characteristics as time

frequency and amplitude of S-transform

and the perturbation time and type are judged. The simulation results show that the combination of improved EMD denoising and S-transform can effectively remove the noise component in the signal and improve the accuracy of power quality perturbation analysis under noise interference.

关键词

电能质量EMD去噪IMFS变换小波阈值

Keywords

power qualityEMD denoisingIMFS-transformwavelet threshold

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