Control DC bus voltage of active power filter with a novel control

In this paper, a PID control analysis for active power filter (APF) is presented. Based on the analysis, it is clearly shown that a large overshoot and long setting time of DC bus voltage will occur when conventional PI controller is used in APF. To solve this problem, a novel control strategy is introduced to improve the performance of the controlled system. The stability of the closed-loop system will also be proved by Lyapunov function. At last, simulation results are given to verify the correctness of the PID analysis and illustrate the advantages of the control strategy.