Research on APF for Instantaneous Reactive Power Harmonic Detection Based on Wavelet Analysis

Active power filter (APF)is currently the most effective new type of power electronic device for harmonic control. Compared with traditional passive filters, it has the characteristics of fast, flexible, and superior compensation effect. This article proposes a new harmonic current detection algorithm suitable for three-phase three wire system, which uses wavelet analysis to construct wavelet filters and replace traditional low-pass filters. This method can be used under conditions of voltage distortion in the power grid, and the phase error of the phase-locked loop will not affect the final measurement results. The simulation results demonstrate the efficiency of the new harmonic current algorithm.