基于Hankel矩阵和奇异值分解的局部放电窄带干扰抑制方法  

A Method of Suppressing Narrow-band Interference in Partial Discharge Based on Hankel Matrix and Singular Value Decomposition

作　　者：徐永干 姜杰[1] 唐昆明[1] 张太勤 罗建[1] 谢敏[3] XU Yonggan;JIANG Jie;TANG Kunming;ZHANG Taiqin;LUO Jian;XIE Min(State Key Laboratory of Power Transmission Equipments&System Security and New Technology(Chongqing University),Shapingba District,Chongqing 400044,China;Chongqing Xinshiji Electric Power Corporation,Shapingba District,Chongqing 400030,China;School of Electrical Engineering and Information,Sichuan University,Chengdu 610065,Sichuan Province,China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044 [2]重庆新世纪电气有限公司,重庆市沙坪坝区400030 [3]四川大学电气信息学院,四川省成都市610065

出　　处：《电网技术》2020年第7期2762-2769,共8页Power System Technology

基　　金：国家自然科学基金项目(51577018)。

摘　　要：针对高压设备局部放电信号的周期性窄带干扰抑制问题,提出一种基于Hankel矩阵和奇异值分解的窄带干扰抑制方法。首先,通过染噪局部放电信号采样序列构造Hankel矩阵,作为轨迹矩阵,并对其做奇异值分解;研究窄带干扰奇异值分解的规律,并在该规律的基础上利用奇异熵增量和K均值算法找出窄带干扰对应的奇异值,对窄带干扰进行重构;得到窄带干扰后,从染噪信号中将其除去,获得只含有白噪声的局放(partial discharge,PD)信号。对染噪局部放电仿真信号、实测信号进行窄带干扰抑制,并与改进FFT阈值法、小波降噪的结果进行对比分析。结果表明:该方法对窄带干扰的抑制效果更好,波形相似度更高。Aiming at the problem of suppressing narrow-band interference of partial discharge(PD)signal in HV equipment,this paper presents a new denoising method based on Hankel matrix and singular value decomposition(SVD).Firstly,a Hankel matrix is constructed by sampling value of noisy signal,used as the trajectory matrix of singular value decomposition(SVD).Then the rule of singular value decomposition of narrow-band interference is studied.On the basis of this rule,the singular values corresponding to narrow-band interference are found using the increment of singular entropy and K-means algorithm,and the narrow-band interference is reconstructed.Finally,by subtracting the narrow-band interference from original signal,the PD signal containing only white noise is obtained.The proposed method is applied to simulation signal and laboratory signal,and its results are compared with those of improved FFT threshold method and wavelet denoising method.The results show that,compared with the other two methods,the denoising effect of this method is better,and its results are more similar to original PD signal.

关 键 词：局部放电 窄带干扰 HANKEL矩阵 奇异值分解 K均值算法 

分 类 号：TM85[电气工程—高电压与绝缘技术]