改进小波阈值函数在局放去噪分析中的应用

为解决局部放电信号检测中白噪声的抑制问题,在D. L. Donoho 和I. M. Johnstone 提出的多分辨分析小波阈值去噪方法的基础上,构造了一个双变量阈值函数.该阈值函数通过改变k值来调节阈值化小波系数与原始小波系数之间的恒定偏差;并通过改变参数m来调节平滑过渡区内曲线的阶次,用于局部微调,弥补了硬阈值法不连续性和软阈值法具有偏差的不足.仿真结果表明,改进后的小波阈值函数的信号去噪效果明显,具有较高的实用价值.

Application of Improved Wavelet Threshold Function in Partial Discharge Signal De-noising Analysis

To solve the white noise suppression in partial discharge signal detection,on the basis of the multiple resolution analysis wavelet threshold de-noising method put forward by D.L.Donoho and I.M.Johnstone,a new threshold function with dual variables is structured.With this threshold function,through changing the value of k,the constant deviation between threshold wavelet coefficient and original wavelet coefficient can be adjusted;while through changing the parameter m,the order of curve inside smooth transi...