Instantaneous deadbeat control for PWM inverter using FPGA based hardware controller

A new approach for real time digital feedback control of PWM inverter is proposed, in which an ideal instantaneous deadbeat control is realized without any sampling compensation method using FPGA based hardware controller. Deadbeat control ensures the state variables matches at each sampling instants for every sampling period. Generally this kind of control system is realized based on DSP based software controller, so some kind of sampling compensation technique is necessary because the state variables at kth sampling instant cannot be used for control outputs at kth control period. In this paper, a novel approach to realize the ideal dead-beat control using FPGA based hardware controller is proposed. The FPGA based hardware controller enables to realize almost ideal real time digital feedback controller because of its capability to realize very fast calculation of the control method with is a few μ second. As the result, the state variables at kth sampling instant can be used for the control output at kth sampling interval, the real time digital feedback control can be realized without any sampling compensation. From the view point of UPS applications, the advantages and the disadvantages are discussed through simulations and experiments, the superiority of the proposed control law is verified.