Analysis and design of repetitive controller based on regeneration spectrum and sensitivity function in active power filter system

Conventional repetitive controller can hardly obtain a fast dynamic response. In order to achieve a faster dynamic performance, an improved repetitive controller is proposed in this study. The controller adds a proportional link in parallel with the original repetitive control loop. Based on the regeneration spectrum theory and the sensitivity function, the stability, steady-state error and convergence of the control system are analysed. A parameter design method is also developed. The feasibility of the controller is shown in simulations and verified by the experimental works. The simulation and experiment results confirm that the improved repetitive controller and the parameter design method are effective in the active power filter design.