基于经验模态分解的电能质量信号消噪新方法

A New Method of the Power Quality Signal De-noising Based on Empirical Mode Decomposition

基于EMD理论,采用一种电能质量信号消噪的新方法,即首先对电能质量信号进行EMD分解,得到一系列的IMF分量和一个剩余分量,根据噪声和信号在不同尺度的IMF分量上的表现特性,分别将其进行阈值处理,再将消噪后的IMF分量重构,从而得到消噪后的电能质量信号.仿真结果表明,该方法的消噪效果较好.

Based on the Empirical Mode Decomposition （EMD）, this paper employs a new method to remove noise of power quality signals. Firstly, analysis the power quality disturbance signals by EMD, a series of intrinsic mode functions （IMFs） and a residue are gained. Then the IMFs are threshold; finally the de-noised signals are acquired by reconstructing the threshold IMFs. The simulation indicates that this new method has the excellent ability of de-noising; it could obtain wonderful result in dealing with power quality signal de-noising.