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提出了先利用小波变换对故障信号进行滤波 ,再用傅里叶变换提取工频分量的算法。仿真计算结果表明这一算法的误差比直接利用傅里叶变换的误差要小得多。
The algorithm of filtering the fault signal by wavelet transform and extracting the power frequency component by Fourier transform is proposed. The simulation results show that the error of this algorithm is much smaller than that of using the Fourier transform directly.