| Abstract |
In this paper, a single-phase deadbeat digital current control algorithm using voltage source inverters for grid-connected applications is presented. The controller is designed directly in the digital domain using the method of Ragazzini. The line voltage is estimated by bandpass filtering the current error. The development of a robust fast prototyping platform, consisting of a Field Programmable Gate Array (FPGA) and a Digital Signal Processor (DSP), is discussed. The current control algorithm is implemented on a Digital Signal Processer, while the Pulse Width Modulation (PWM) algorithm and additional protection blocks are implemented in the FPGA. Both the simulations and the experimental results validate the results of the theoretical analysis. Specific advantages of the proposed current control algorithm include the fast and accurate deadbeat response, the robust operation and the avoidance of the use of a line voltage sensor. |
