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局部放电信号中抑制周期性窄带干扰的逆向分离方法

, PP. 232-239

Keywords: 局部放电,窄带干扰,矩阵束算法,独立分量分析,消噪,逆向分离

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Abstract:

为了有效提取局部放电信号,提出一种抑制周期性窄带干扰的逆向分离方法。该方法由两部分组成利用矩阵束算法估计含噪局部放电信号中的窄带干扰频率;借助独立分量分析算法,逆向分离出抑制窄带干扰后的局部放电信号。针对在不同信噪比下的局部放电信号,分别运用小波、多小波消噪算法和该方法抑制窄带干扰。仿真结果表明,与小波、多小波相比,在信噪比低至-20dB时,该方法表现出更强的抗噪能力,同时能更好的保留原信号特征。现场测试信号的处理结果也验证了所提方法的有效性。

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