Robust Predictive Deadbeat Control for Three-Phase Buck PWM Rectifier

In the system of a three-phase Buck PWM rectifier, the time delay and the variation in grid-side inductance can affect system stability and induce distortion in the grid-side current. To address this issue, this paper proposes a robust predictive deadbeat control strategy for the three-phase buck-type PWM rectifier to enhance the system's robustness and reduce the total harmonic distortion (THD) of the grid-side current caused by time delay and inductance mismatch. The deadbeat control model with delay is analyzed in the z-domain, and the impact of inductance mismatch on system stability is examined. The linear interpolation method and Luenberger observer are employed to predict the grid-side voltage and current, respectively, with stability analysis performed using the root locus technique. The simulation results demonstrate the effectiveness of the proposed control method.