An application of optimized repetitive control in uninterruptible power system

In this paper, we proposed an improved calculating method of repetitive control, in the light of the output voltage jump caused by the traditional calculating method during the periodic transition of output voltage. In the improved model, the zero crossing information of phases outputted by the controller is used to judge the start of learning cycle of repetitive control loop and calculate the actuating quantity of repetitive control. In one circle, the integration and actuating position of repetitive control is relatively fixed. So effects on the output voltage, caused by fluctuates of actuating quantity of repetitive control, can be effectively decreased. In the end of this paper, the comparison experiments between two methods are conducted to verify the feasibility of the improved method.