基于奇异谱分析的车载电缆局部放电窄带干扰抑制

doi:10.11985/2023.03.005

摘要/Abstract

摘要：

局部放电检测是评估车载高压电缆绝缘状态的重要方法之一。而窄带干扰作为最常见的干扰之一，会导致局部放电信号淹没在噪声中，从而难以获取准确的局部放电信号，给电缆绝缘状态的评估带来困难。介绍一种基于奇异频谱分析的方法，用于抑制车载高压电缆局部放电信号中的窄带干扰。该方法通过对奇异谱分析(Singular spectrum analysis，SSA)实现对一维信号的分析和预测，从而从时间序列中分解出趋势项、周期项和噪声。为了验证所提方法的有效性，模拟了具有窄带干扰的理想局部放电信号，并应用所提方法对信号进行降噪处理。同时，在实验室内进行了真实局部放电信号的验证试验。降噪结果表明，所提方法能够有效地消除车载高压电缆局部放电信号中的窄带干扰，对于判断车载电缆的绝缘状态具有一定的指导意义。本文研究为车载高压电缆局部放电信号提取提供了一种新的方法，对车载电缆绝缘状态评估具有潜在的工程应用价值。

关键词: 车载电缆, 局部放电, 周期性窄带干扰, 奇异谱分析

Abstract:

Partial discharge detection is one of the important methods for assessing the insulation status of vehicle-mounted high-voltage cables. Narrowband interference, as one of the most common interferences, causes the partial discharge signal to be submerged in noise, which makes it difficult to obtain an accurate partial discharge signal and brings difficulties to the assessment of the cable insulation state. A method based on singular spectrum analysis is introduced for suppressing the narrowband interference in the localized discharge signal of vehicle-mounted high-voltage cables. The method realizes the analysis and prediction of one-dimensional signals by singular spectrum analysis(SSA), which decomposes the trend term, period term and noise from the time series. In order to verify the effectiveness of the proposed method, an ideal localized discharge signal with narrow-band interference is simulated, and the proposed method is applied to noise reduction of the signal. At the same time, the validation experiments of real localized discharge signals are carried out in the laboratory. The noise reduction results show that the proposed method can effectively eliminate the narrow-band interference in the partical discharge signal of the vehicle-mounted high-voltage cable, which is of some significance for judging the insulation status of the vehicle-mounted cable. This study provides a new method for localized discharge signal extraction for on-board high-voltage cables, which has potential engineering applications for the assessment of insulation status of on-board cables.

Key words: Vehicle cable, partial discharge, periodic narrow-band interference, singular spectrum analysis

中图分类号:

TM855

杨思为, 高国强, 刘凯, 周书圆, 陈奎, 唐于京, 辛东立, 吴广宁. 基于奇异谱分析的车载电缆局部放电窄带干扰抑制[J]. 电气工程学报, 2023, 18(3): 46-53.

YANG Siwei, GAO Guoqiang, LIU Kai, ZHOU Shuyuan, CHEN Kui, TANG Yujing, XIN Dongli, WU Guangning. Narrowband Interference Suppression of Partial Discharge for High-speed Train on Singular Spectrum Analysis[J]. Journal of Electrical Engineering, 2023, 18(3): 46-53.

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序号	幅值/mV	时间常数/μs	振荡频率/MHz
1	12	0.5	8
2	12	0.5	7
3	30	1	8
4	30	1	10

方法	SNR	MSE	NCC
SSA	20.480 6	0.024 39	0.957 8
EMD法	5.936 0	0.762 6	0.646 6
EWT法	10.520 4	0.054 4	0.892 5

降噪方法	标准差
SSA	18.21
EWT法	16.31
EMD法	12.28