电工技术学报  2017, Vol. 32 Issue (9): 211-220    DOI:
高电压与绝缘技术 |
基于广义S变换模时频矩阵的局部放电特高频信号去噪方法
刘宇舜1, 周文俊1, 李鹏飞1, 王勇2, 田妍2
1. 武汉大学电气工程学院 武汉 430072;
2. 广州供电局有限公司 广州 510620
Partial Discharge Ultrahigh Frequency Signal Denoising Method Based on Generalized S-Transform Modular Time-Frequency Matrix
Liu Yushun1, Zhou Wenjun1, Li Pengfei1, Wang Yong2, Tian Yan2
1.School of Electrical Engineering Wuhan University Wuhan 430072 China;
2.Guangzhou Power Supply Bureau Co. Ltd Guangzhou 510620 China
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摘要 为有效抑制局部放电特高频信号中的噪声干扰,提出一种基于广义S变换模时频矩阵的去噪方法。基于二维模时频矩阵,采用区域最大能量法提取周期性窄带干扰的特征量,并通过矩阵逆向分离将其去除;采用奇异值分解去噪方法抑制信号中的高斯白噪声。使用该方法对仿真信号和实验室实测信号进行去噪处理,并与传统方法去噪结果进行对比。结果表明,所提方法能有效抑制局部放电信号特高频信号中的噪声,同时更好地保留了原始局部放电信号特征。对现场实测信号进行去噪处理,与传统方法相比,该方法具有较高的噪声抑制比和较低的幅值衰减比,可以有效提取局部放电超高频信号。
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刘宇舜
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王勇
田妍
关键词 局部放电去噪广义S变换窄带干扰区域最大能量法高斯白噪声奇异值分解    
Abstract:In order to suppress the noise in the partial discharge (PD) ultrahigh frequency (UHF) signal, a denoising method based on generalized S-transform modular time-frequency matrix is proposed. Maximum local energy method was used to extract the characteristics of periodic narrow-band interference and cancel the interference through the matrix reverse separation based on two-dimension modular time-frequency matrix. In addition, singular value decomposition was used to suppress of Gaussian white noise in the PD signal. The denoising method presented in this paper was applied on the simulation and laboratory measured signals. Compared the denoising results with other four traditional denoising methods, the results show that the method presented in this paper suppressed the noise in the PD UHF signal effectively and retained more characteristics of PD signal. Compared with traditional methods, the denoising results of filed test signal validated the effectiveness of extracting PD signal with higher noise reduction ratio and lower amplitude reduction ratio.
Key wordsPartial discharge    denoising    generalized S-transform    narrow-band noise    maximum local energy method    white Gaussian noise    singular value decomposition   
收稿日期: 2016-01-22      出版日期: 2017-05-12
PACS: TM835  
通讯作者: 周文俊 男,1959年生,教授,博士生导师,研究方向为高电压与绝缘技术。E-mail: wjzhou@whu.edu.cn   
作者简介: 刘宇舜 男,1990年生,博士研究生,研究方向为电力设备故障诊断。E-mail:silencelys@163.com
引用本文:   
刘宇舜, 周文俊, 李鹏飞, 王勇, 田妍. 基于广义S变换模时频矩阵的局部放电特高频信号去噪方法[J]. 电工技术学报, 2017, 32(9): 211-220. Liu Yushun, Zhou Wenjun, Li Pengfei, Wang Yong, Tian Yan. Partial Discharge Ultrahigh Frequency Signal Denoising Method Based on Generalized S-Transform Modular Time-Frequency Matrix. Transactions of China Electrotechnical Society, 2017, 32(9): 211-220.
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