In view of not achieving static error free tracking control and not assuring fast and accurate control of the voltage at DC side when load sudden change or reference voltage jump by the traditional PI control method

a kind of APF current control method based on repetitive control and sliding mode variable structure control is proposed.The advantage of sliding mode variable structure control and repetitive control is combined on the basis of traditional PI control in this method

the repetitive control is introduced into the current inner loop control to perform fast tracking and control of the APF output current

and the sliding mode variable structure is introduced into the voltage outer loop control for fast and accurate control of the voltage at DC side.It is proved by the simulation and experimental result that the current control method

compared to traditional PI control method

has higher harmonic compensation accuracy and faster dynamic response speed.