An Optimized Deadbeat Control Scheme Using Fuzzy Control in Three-Phase Voltage Source PWM Rectifier

Usually, the deadbeat control strategy is applied to three-phase voltage source PWM rectifiers. Often, deadbeat control uses a forward predictive algorithm of the reference current to compensate the control delay. Because of the uncertainty of reference variations, single predictive algorithm may cause large current overshoot or phase delay in different reference changes. The paper obtained the relationship among the prediction parameter, the current overshoot, and the phase delay after comparing and analyzing three commonly used predictive algorithms. Based on it, a new predictive algorithm was introduced using fuzzy control method. This algorithm chose appropriate prediction parameter according to different reference current changes, which was a tradeoff between current overshoot and phase delay. As a result, the maximum value of current overshoot was limited and the phase delay was optimized. Finally, an experimental prototype of a three-phase voltage source PWM rectifier controlled by a TMS320F2812 DSP was built and tested. The experimental results verified the validity of the proposed control approach.