基于小波包除噪的电能质量扰动检测方法

小波包变换能够实现信号频带的均匀划分，在任意频率聚焦，是分析暂态电能质量扰动时频特性的良好工具。但是电气信号中的电磁噪声严重影响了小波包的检测特性。该文提出了一种小波包除噪算法。通过仿真验证，该算法可以消除扰动检测中的噪声影响，从而为噪声环境中电能质量扰动的检测和定位提供了良好的依据。

POWER QUALITY DISTURBANCE DETECTION METHOD USING WAVELET PACKAGE TRANSFORM BASED DE-NOISING SCHEME

Wavelet package transform (WPT) can divide the signal frequency into uniform frequency sub bands, which make it a good tool for transient power quality disturbance detection and localization. However, the noise in the electrical signal greatly degrades its detection performance. This paper proposes a WPT denoising algorithm, and gives theoretical analysis and practical implementation of the algorithm. Simulation validates that the proposed algorithm can eliminate the influence of noise components and implement transient power quality disturbance detection and localization, thus providing good foundations for transient power quality disturbance monitoring under noise environment.