Survey on the real time digital feedback control of PWM inverter and the extension to multi-rate sampling and FPGA based inverter control

The real time digital feedback of PWM inverter for the output waveform synthesis was initiated in the mid 80´s and it was extended in a wide field now. First, the basic concept for the classical PWM inverter digital control modeling was reviewed followed by UPS application and motor current regulation. Second, the multi-rate sampling control was surveyed, and it was shown that the robustness of the initial concept was very much improved. Third, it is mentioned that the FPGA based control eliminated the computation time for the power electronic digital control and a new field appeared.