Internal model control strategy for SPWM inverter based on dynamic matrix control algorithm

It´s difficult for digitalized SPWM inverter to obtain high quality sine waveform and strong robustness since its time-delay phenomenon and load parameter uncertainty using the traditional control strategies. In this paper, internal model control strategy based on dynamic matrix control algorithm is proposed as a new solution. It´s also proved that this new control strategy is suitable for the system with time-delay phenomenon, external disturbance and load parameter uncertainty; in addition, the reference signal is inconstant. Further more, because of its simplicity, this algorithm can be used for real-time controlling system where the speediness is critical. A single closed-loop SPWM inverter is designed using the proposed control algorithm to achieve accurate control. Then, robustness and performance in rejection to disturbance are depicted. Finally, simulation and experimental results illustrate that the control algorithm can overcome external disturbance and load parameter uncertainty, and SPWM inverter can achieve good robustness, steady-state accuracy, and fast dynamic performance.