Self-adaptive fuzzy PI control of DC voltage in active power filter

In order to solve the active power filter(APF) large overshoot problem in terms of DC-side voltage control, this paper designed a parameter-adaptive fuzzy PI controller based on conventional PI control and fuzzy control theory. According to the fuzzy control rule, this strategy could correct PI parameters in real-time to achieve self-adaptive purpose. Simulation results show that the strategy has fast response. small overshoot that meet the requirements of DC voltage control during start-up and load mutation. and also has good filtering effect which is significantly better than conventional PI control strategy. So it greatly improved static and dynamic performance of the system.