Multirate Deadbeat Control for PWM Inverter using FPGA based Hardware Controller

Abstract

A new approach for real time digital feedback control of PWM inverter is proposed, in which a deadbeat control combined with multirate control method is realized using FGPA (Field Programmable Gate Array) based hardware controller. Adopting the multirate deadbeat control, the sampling frequency of the inverter becomes half of the carrierfrequency, and the tracking error of the output voltage can be decreased. Also the FPGA based control hardware enables to realize almost ideal real time digital feedback controller because of its capability to realize very fast calculation of the control method within a few μ second. Design concept of the FPGA based hardware controller for PWM inverter is proposed, and experiments were carried out. Experimental result shows the ability of the FPGA based hardware controller, the inverter output voltage is coincident with the reference voltage in one sampling period without any 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.