Study on the control strategy for DC voltage of shunt active power filter

On the basis of the study on PI control,this paper proposes to apply fuzzy recursive PI control on the DC voltage of active power filter,designs the fuzzy control rules,introduces in detail the control principle of fuzzy recursive PI control and simulates the DC voltage through Matlab/Simulink software by PI control and fuzzy recursive PI control.Simulation result shows that when the system is stable and load changes fuzzy recursive PI control eliminates stationary state error more efficiently than PI control does,besides the track of DC voltage of active power filter is more accurate,which enhances the wave filtering effect.