| Abstract |
A new approach for real time digital feedback control of single phase and three phase PWM inverter is proposed,
in which a quasi multirate deadbeat control combined with variable sampling method using FPGA based hardware
controller. It was reported that the deadbeat control method with FPGA based hardware controller had the very
good transient response for various loads, but these reports were mainly focused on a few KW class PWM inverter
system, so the high carrier frequency were adopted for evaluation. But in MW class PWM inverter system, the
carrier frequency is limited up to 2kHz range, because of the performance of the switching devices and the trade
off against the efficiency of the inverter. In this condition, the controllability of the PWM inverter is not so much
expected. In the proposed method, to ensure the tracking accuracy of the output voltage to the reference voltage,
more than two sampled data is used while one carrier interval. The proposed method is applied to single phase
system and then expanded to three phasePWMinverter system. The control characteristics of the proposed variable
sampling deadbeat control were verified through simulations and experiments. |
