局部放电奇异值特征及其混合噪声的自适应抑制  

Singular Value Feature of Partial Discharge and Adaptive Suppression of Mixed Noise

作　　者：庄小亮 罗新 宋廷汉[2] 陈泽铭 牛海清 ZHUANG Xiaoliang;LUO Xin;SONG Tinghan;CHEN Zeming;NIU Haiqing(Guangzhou Bureau of CSG EHV Power Transmission Company,Guangzhou 510663,China;School of Electric Powers,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]中国南方电网超高压输电公司广州局,广州510663 [2]华南理工大学电力学院,广州510640

出　　处：《高压电器》2023年第11期231-239,共9页High Voltage Apparatus

基　　金：南方电网超高压科技项目(CGYKJXM20180104)。

摘　　要：为了抑制局部放电信号中混杂的窄带干扰和白噪声,文中首先分析了典型局部放电、窄带干扰和白噪声信号的Hankel矩阵奇异值的分布特征;提出了确定窄带干扰和典型局放奇异值有效阶次的自适应方法;将信号Hankel矩阵的有效阶次奇异值作为其特征量,在染噪信号中去除窄带干扰后重构信号,截取局部重构信号从中提取局放。通过对模拟和实测染噪信号的处理,验证了文中方法去除窄带干扰和白噪声的有效性。For suppressing the narrow-band interference and white noise which is mixed in the partial discharge signal,the distribution characteristic of singular values under Hankel matrix of typical partial discharge,narrow-band interference and white noise are analyzed firstly.Then,an adaptive method is proposed to determine the effective order of the singular value for narrow-band interference and typical partial discharge.In this method,the effective order of singular value signal under Hankel matrix is taken as its characteristic value.The narrow band interference is removed from the noisy signal and the signal is reconstructed.Finally,the partial discharge is extracted from the reconstructed signal.The effectiveness of the proposed method in removing narrow-band interference and white noise is verified by the processing of simulated and measured noisy signals.

关 键 词：局部放电 窄带干扰 白噪声 奇异值 去噪 

分 类 号：TM855[电气工程—高电压与绝缘技术]