Digital control method for 100kHz single phase utility interactive inverter with FPGA based hardware controller

A current control method for the utility interactive inverter based on multi-rate deadbeat control method with FPGA based hardware controller is verified for 100kHz carrier PWM inverter. As the distributed power systems spread, the requirement of the control accuracy for the utility interactive inverter becomes more presice. As the carrier frequency of the PWM inverter gradually become higher range, the suitable digital control method for the high carrier PWM inverter has to be considered to ensure the precise tracking accuracy and the robustness for the parameter variations. A current control method for the utility interactive inverter based on multi-rate deadbeat control, single-rate deadbeat control and PI control were compared. Multi-rate deadbeat control improves the tracking accuracy to the reference compared with the conventional singlerate deadbeat control and PI control. The advantages and disadvantages are discussed through simulations and expriments.