Internal model control of voltage-sourced PWM rectifier based on inverted decoupling

For three-phase voltage-sourced PWM rectifier, a novel double closed loop control method was proposed in this paper, based on the mathematical model in synchronous rotating coordinate system. Considering the coupling characteristics, the current inner loop developed a practical hybrid control method, consisting of inverted decoupling and internal model control (IMC), which could realize the complete decoupling of the nominal systems, and reduce the controller's tuning parameters. Then, the IMC-PID controller was designed based on the simplified model of voltage outer loop to improve system's robustness and dynamic performance. The simulation results demonstrate the validity of the proposed strategy.