自适应奇异值分解局放信号降噪方法  

Partial discharge denoising method based on adaptive singular value decomposition

作　　者：孙传铭 魏隆 张梦楠 刘凯[2] 潘贵翔 高国强[2] SUN Chuan-ming;WEI Long;ZHANG Meng-nan;LIU Kai;PAN Gui-xiang;GAO Guo-qiang(CRRC Qingdao Sifang Locomotive & Rolling Stock Co., Ltd,Qingdao 266111,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中车青岛四方机车车辆股份有限公司,山东青岛266111 [2]西南交通大学电气工程学院,四川成都610031

出　　处：《电工电能新技术》2021年第5期34-41,共8页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然基金项目(51907167);国网总部科技项目(SGSNKY00KJJ2000037)。

摘　　要：针对高压设备局部放电现场检测时存在周期性窄带干扰、白噪声问题,提出了一种自适应奇异值分解局放信号降噪方法。该方法首先对测试信号构建Hankel矩阵,以此作为轨迹矩阵进行奇异值分解;通过提取前两个奇异值重构并结合功率谱熵自适应判断测试信号中是否含有周期性窄带干扰,以此为判断依据利用奇异值本身和奇异值子集标准偏差作为奇异值系列特征量,对其进行1次K类均值聚类算法获取局放信号对应有效奇异值片段;对该奇异值片段进行重构,进而获取降噪后的局放信号。通过对仿真、实测局放信号进行去噪,并与传统降噪方法进行对比分析。结果表明,该方法对于混合噪声干扰具有更优的抑制效果,能较好地还原局部放电信号。An adaptive singular value decomposition method for partial discharge signal noise reduction is proposed to solve the problems of white noise and periodic narrow-band interference in the field detection of partial discharge in high voltage equipment.Firstly,the Hankel matrix is constructed as the trajectory matrix for singular value decomposition.By extracting the first two singular value reconstruction signal to determine whether a test signal contains the periodic narrowband interference and using this as creterion to judge on the basis of using the singular value and the singular values standard deviation for the characteristic value,the first order K-means clustering algorithm is used to obtain the singular value fragment corresponding to the partial discharge signal,and then it is reconstructed to obtain the partial discharge signal after noise reduction.The simulated and measured partial discharge signals were de-noised and compared with the traditional denoising methods.The results show that this method has better suppression effect on mixed noise and can restore partial discharge signal well.

关 键 词：局部放电 白噪声 周期性窄带干扰 奇异值分解 K均值聚类 

分 类 号：TM855[电气工程—高电压与绝缘技术]