基于小波多分辨分析的谐波检测应用研究

The Research on the Application of Harmonic Detection through the Analysis of Wavelet Multi-Resolution

小波变换可以对信号进行多尺度分析,对信号具有按频带进行划分的能力,因而能将电压或电流等信号分解为基波信号和高次谐波信号,为电力系统谐波分析提供了有利的数学工具。该文提出了将其应用于电力系统谐波检测的思路和方法,对含有谐波的电流信号进行了基频分量提取,给出误差范围,仿真结果说明该方法具有一定的有效性和可行性。

Wavelet transformation, having the capacity of band division, can be used to analyze signals to be processed through multi-scales. Therefore, it can decompose voltage or current signals into fundamental waves and higher harmonic waves. Wavelet transform is a powerful mathematic tool for the harmonic analysis of the power system. This paper puts forwards the methods of harmonic detection in a power system. In addition, simulation examples are cited in the error when the fundamental component is extracted by use of the wavelet decomposition. The simulation results show that the method is valid to a certain extent.