Current control method using voltage deadbeat control for single phase utility interactive inverter with FPGA based hardware controller

Abstract

In this paper, a new control method for the utility interactive inverter based on the deadbeat control with FPGA based hardware controller to improve the control response for a utility current is proposed. Deadbeat control is one method to ensure the output voltage or current matches to the references at the sampling instant, so adopting this control law to the utility interactive inverter, the response of the system is much improved with small LC filter component compared with the conventional PI control, which results in the improvement of the cost performance of the inverter. The utility interactive inverter is linked to the commercial source via interactive inductor, so the inverter control the output voltage based on the deadbeat control to regulate the output current through the interactive inductor, as the result, very fast transient response of the utility current can be achieved. Current control method using voltage deadbeat control and PLL control with quasi dq transformation with multi sampling parallel processing method are implemented in FPGA based hardware controller for single phase utility interactive inverter. The design concept of FPGA based hardware controller is also described, and the advantages and the disadvantage of the proposed method are discussed throughout simulations and experiments.