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模态相关法在MOA泄漏电流去噪中的应用

DOI: 10.16188/j.isa.1003-8337.2015.06.020, PP. 97-102

Keywords: MOA泄漏电流,老化,去噪,模态相关,EMD

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Abstract:

针对MOA泄漏电流幅值小,易受噪声干扰的问题。基于模态相关法基本原理,以求取相关系数第一极小值点为目标,首先使用检验模态分解法(empiricalmodedecomposition,EMD)对采集的含噪声泄漏电流信号进行固有模态函数(intrinsicmodefunctions,IMF)分解,求取各层IMF分量与原始信号之间的相关系数,得到第一极小值点,进而得到信号与噪声主导的IMF分量的分界点。最后通过重构有用信号的模态函数实现对MOA泄漏电流的去噪。计算发现:当泄漏电流信号信噪比分别为-1.1dB、-3.2dB、-5.1dB和-6.7dB时,使用模态相关法去噪后可将信号信噪比提高26.08dB、24.17dB、24.42dB和23.80dB;使用小波阈值去噪则可以分别提高21.06dB、18.20dB、17.48dB和15.71dB。两种算法的去噪效果明显。与小波阈值去噪法相比,模态相关法有较好的自适应能力,灵活度更高。对于准确监测MOA泄漏电流,及时发现MOA老化情况有指导意义。

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