Current control of three-phase PWM inverters for embedded generators

This paper presents the analysis and design of a novel current control technique of three-phase voltage-source PWM inverters to be connected between a DC source and the utility for embedded generation. The controller is based on an analog feedforward-feedback controller utilising fixed-frequency suboscillation PWM. With the use of cyclic feedback devised from the iterative learning control (ILC) method, it is shown that the controller eliminates the inherent steady state phase and magnitude error of suboscillation PWM method