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基于变分模态分解和小波分析的变压器局部放电去噪研究*
引用本文:赵磊,朱永利,高艳丰,陈旭,郭小红.基于变分模态分解和小波分析的变压器局部放电去噪研究*[J].电测与仪表,2016,53(11):13-18.
作者姓名:赵磊  朱永利  高艳丰  陈旭  郭小红
作者单位:华北电力大学新能源电力系统国家重点实验室,河北保定,071003
基金项目:中央高校基本科研业务费专项资金资助项目(2014xs74)
摘    要:为有效去除变压器局部放电信号中大量的电磁干扰,针对现有经验模态分解存在模态混叠等问题,提出将一种新的信号分解算法——变分模态分解结合小波运用在变压器局部放电信号中来抑制窄带周期干扰和白噪声。首先利用变分模态分解将含噪信号分解成若干个以某中心频率波动的模态,在分解过程中自动滤去白噪声;然后提取含局部放电信息的模态进行重构;最后通过小波去除残余窄带周期干扰,进而实现干扰抑制。仿真和实测信号分析结果表明,该方法能很好地抑制两类干扰,保留局部放电信号特征,验证了采用变分模态分解结合小波去除噪声的有效性,为局部放电信号去噪提供了一种新的方法。

关 键 词:变压器  局部放电  信号去噪  变分模态分解  小波去噪
收稿时间:2015/1/28 0:00:00
修稿时间:2015/4/17 0:00:00

Research on denoising of transformer partial discharge based on variational mode decomposition and wavelet analysis
Zhao Lei,Zhu Yongli,Gao Yanfeng,Chen Xu and Guo Xiaohong.Research on denoising of transformer partial discharge based on variational mode decomposition and wavelet analysis[J].Electrical Measurement & Instrumentation,2016,53(11):13-18.
Authors:Zhao Lei  Zhu Yongli  Gao Yanfeng  Chen Xu and Guo Xiaohong
Affiliation:State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University,State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University,State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University,State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University,State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University
Abstract:In order to effectively remove the electromagnetic interferences in transformer partial discharge ( PD) sig-nals, this paper proposes that applying a new signal decomposition algorithm—variational mode decomposition ( VMD) and wavelet to transformer PD signal to suppress the periodical narrow-band interferences and white noise be-cause of the problems of empirical mode decomposition such as modal aliasing .Firstly, VMD can decompose noisy signal into several modes , which are compact around a center pulsation respectively , and the white noise is automati-cally filtered out in the decomposition process;then, extract modes which contain PD information for reconstruction , finally, we remove residual periodical narrow-band noises by wavelet denoising so as to realize interference suppres-sion .The analysis results of simulations and measured signals show that the proposed method can eliminate two kinds of interferences well and retain the PD characteristics , it verifies that the approach which uses VMD and wavelet to re-move the interferences is efficient and thus it is fit for PD signal denoising .
Keywords:transformer  PD  signal denoising  VMD  wavelet denoising
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