自适应阈值多小波故障暂态信号去噪方法

Adaptive shrinkage value de-noising method of fault transient signals with multiwavelets

在介绍多小波基本理论的基础上 ,探讨了基于多小波的信号去噪方法。针对目前多小波去噪方法的不足 ,提出一种基于自适应阈值的多小波去噪方法 ,应用于电力系统输电线故障暂态信号的去噪 ,并与基于传统阈值多小波和小波的去噪效果进行了比较。仿真结果表明 ,该方法可以根据实际信号自适应改变阈值大小 ,在去噪效果上优于传统多小波去噪方法。

Based on the basic theory of multiwavelet, the multiwavelet de-noising methods are discussed. After the analysis of traditional method, an adaptive shrinkage value de-noising method based on multiwavelet is proposed. This method is adopted in fault transient signal de-noising of power transmission lines, and its de-noising effect is compared with the traditional multiwavelet and wavelet methods. The simulation results indicate that the shrinkage value changeds adaptively with signals, and the de-noising effect is better than that of the traditional method.