A Three-Phase Active Power Filter Based on Improved Adaptive Harmonic Detection

Aiming at the problems that traditional algorithm has slow convergence rate and that the adaptive method with LPF has the drawback of slow dynamic response, an improved adaptive method for harmonic detecting based on integrated mean value is researched in this paper. Instead of the traditional LPF method, the moving average method is used to obtain the DC components by calculating the mean value of fundamental currents. And a Dual-Buck inverter circuit with a hysteresis current control method is presented in this paper. The simulation results show that a rapid transient response can be obtained under the improved method, and the compensation effects of APFs can meet the requirements of National Standard GB/T 14549-93 and IEC -61000-3-2A. The method is suitable for the harmonics compensation when the supply voltages are of distortion.