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局部放电信号稀疏表示去噪方法

DOI: 10.13334/j.0258-8013.pcsee.2015.10.030, PP. 2625-2633

Keywords: 局部放电,脉冲匹配原子,稀疏表示,匹配追踪,改进量子遗传算法,残差比阈值,去噪

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Abstract:

局部放电(partialdischarge,PD)(简称局放)信号易受噪声干扰,影响监测效果。针对局放信号噪声抑制问题,提出了一种局放信号稀疏表示去噪方法。该方法以信号的稀疏表示及其匹配追踪算法为核心,构建了与局放信号特征相匹配而与噪声信号不相关的局放脉冲匹配原子,并组成过完备原子库。在该原子库中采用匹配追踪算法对染噪局放信号进行稀疏表示,提取最佳局放脉冲匹配原子;并通过改进量子遗传算法加速最佳匹配原子搜索进程,减小计算时间复杂度;同时以残差比阈值作为MP算法迭代终止条件,避免因迭代次数选取不当对去噪结果的影响。最后利用各次迭代提取的最佳脉冲匹配原子仅能对染噪局放信号中原始无噪局放分量进行有效稀疏表示实现去噪目的。运用该方法对仿真信号及实测信号进行了去噪处理,并与基于传统小波理论的局放去噪结果作对比。结果表明,该方法能准确抑制局放信号的噪声干扰,去噪效果优于传统小波方法。

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