Modeling and Simulation of Power Grid Voltage Harmonic Detection Method Based on the Improved Wavelet Packet Transform

In order to solve the existing problems of the grid voltage harmonic detection algorithms, such as low precision, complicated calculation, the harmonic detection algorithm based on wavelet packed transform is proposed in this paper. The filtering algorithm of an improved wavelet packet transform is also presented by combining the wavelet packet transform with two-stage method. That is to say, on the basic of wavelet packet transform, the standard waveform of the fundamental harmonic can be obtained by taking compound decomposition algorithm. And then the amplitude of the fundamental and each odd harmonic is also obtained through the effective value module. The modeling and simulation analysis of the proposed algorithm are performed. The simulation results show that the improved detection algorithm can effectively filter out the harmonics and obtain a complete fundamental wave. The obtained fundamental waveform meets the electricity requirements.