高压电器2018，Vol.54Issue(3)：10-16,7.DOI:10.13296/j.1001-1609.hva.2018.03.002
基于改进DTCWT的GIS局部放电信号降噪方法的研究
Study on Noise Reduction Method of GIS PD Signal Based on the Improved DTCWT
摘要
Abstract
Weak UHF signal generated by partial discharge in GIS is easy to cover up by various extemal noises.Detection of partial discharge in GIS by using UHF method,the effective noise reduction preprocessing must be adopted.This article proposes a kind of improved method of dual-tree complex wavelet transform (DTCWT) partial discharge UHF signal denoise.This method uses DTCWT to decompose noisy signals into a series of wavelet coefficients and obtains the detail components of the signal at different scales.It also uses kurtosises of time-domain signal and of envelope spectrum to pre-filter detail components sensitively which greatly improving the follow up of maximum kurtosis deconvolution(MKD) denoise efficiency.In order to verify the validity and reliability of this new method,an experiment is conducted about GIS partial discharge UHF signal denoise.The result shows that based on the better exerting of DTCWT shift invariance,the methodof this paper is available to precisely suppress the noise interference of PD signal.Furthermore the screening of detail signal componentscan improve the noise reduction effect evaluation and maintain the original PD signal characteristics.关键词
改进DTCWT/MKD/信号降噪/特高频/局部放电/平移不变性Key words
improved dual-tree complex wavelet transform/maximum kurtosis deconvolution/signal denoise/ultrahigh frequency/partial discharge/shift invariance引用本文复制引用
王永强,张斌,李长元,仲钊,王巨伟,崔博源..基于改进DTCWT的GIS局部放电信号降噪方法的研究[J].高压电器,2018,54(3):10-16,7.基金项目
国家电网科技项目(1206112011018).Project Supported by Science and Technology Project of the State Grid Corporation(1206112011018). （1206112011018）
