Current Control Method Using Voltage Deadbeat Control with Multi Sampling Pulse Compensation 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 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 method 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. Also, to utilize the capability of FPGA based hardware controller, a multi sampling method is proposed, which enables 1MHz sampling while the carrier period to improve the control accuracy. All the control circuit for the proposed current control method using voltage deadbeat control and PLL control with quasi-dq transformation with multi sampling method are implemented in FPGA based hardware controller. The design concept of the controller is also described, and the advantages and the disadvantage are discussed through simulations and experiments.