In order to prevent the harmfulness of harmonics to the power system and power equipment, the wavelet transform and wavelet packet transform are used respectively to analyze the harmonics of power system. The simulation results show that both the wavelet transform and wavelet packet transform can exactly extract the fundamental wave from current signal. The wavelet packet transform can decompose more abundant harmonic signals than the wavelet transform. The error rates of each harmonic frequency and amplitude completely correspond with the accuracy requirement of harmonic analysis by the wavelet packet transform.%为了防止谐波对电力系统和用电设备的危害,分别用小波变换和小波包变换对电力系统谐波进行分析.仿真结果表明二者都能将基波从电流信号中正确地提取出来.而小波包变换比小波变换能够分解出更加丰富的谐波信号,利用小波包变换分解的各次谐波频率和幅度的误差率完全符合谐波分析的精度要求.
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