基于提升小波变换的电力系统谐波分析

Harmonic Analysis of Power System Using Lifting Wavelet Transform

谐波是影响电能质量的重要因素,并对电力系统和用电设备产生严重危害和影响.同传统小波变换相比,提升小波变换计算速度更快,计算方法更简单,而快速计算在电力系统中非常重要,特别是在要求实时操作的场合.采用提升小波变换分析电力系统的谐波,并通过实例仿真证明了该方法的可行性和有效性.仿真结果不仅显示在谐波中出现的频率分量,而且描述了这些频率分量在时域内的变化情况.

Harmonic is an important influence of power quality in power system, for it is harmful to the power system and power equipment. Compared with traditional wavelet transform, lifting wavelet transform calculates fast and easily. Fast calculation is important in power system, especially when a real time operation is needed. The lifting wavelet transform is used to analyze the harmonic of power system. The feasibility and validity are proved with example simulation. The simulation result not only indicates which frequency components appear in the harmonic, but also describes how these frequency components change in the time domain.