【摘要】 针对GIS局部放电监测中的白噪干扰 ,以离散二进小波变换为基础 ,采用软硬阈值结合的混合阈值滤波方式 ,将信号的能量误差函数作为去噪的目标函数 ,提出了一种从白噪声中提取GIS局部放电信号的新方法。仿真试验结果表明 ,该方法具有抑制白噪干扰能力强 ,PD信号畸变小 ,算法简单等优点 ,能够从白噪干扰中有效地提取出局部放电信号。更多还原

【Abstract】 A new method for suppressing white noise when monitoring PD signal in GIS is presented A combinative threshold filtering mode which combines soft threshold mode with hard threshold is employed in new method,which is based on discrete dyadic wavelet transformation.Energy error function of signal is regarded as objective function for suppressing white noise in new method.The simulative experimental results indicate that this method can extract PD signal from white noise.Compared to other methods adopted to suppress white noise,the new method performs more accurately and simplier and it is better at suppressing white noise更多还原