H∞ modified direct power control for the single-phase PWM rectifier

To ameliorate the dynamic performance of single-phase pulse width modulation(PWM) rectifiers, the fundamental theory of the traditional power feedforward decoupling was presented, and a proportional-integral modified direct power (PI-MDP) control strategy was proposed, which abolishes the coordinate transformation and can promote the dynamic performance. Then, considering the aging of power devices and other factors, the parameters perturbation of the rectifier system can be inevitable, and the control performance of the rectifier system can thus be affected. To this, an H∞ modified direct power (H∞-MDP) control strategy based on PI-MDP control was proposed to elevate the robustness of the system. The tracking accuracy and control energy were constrained respectively by using the performance weighting functions, and the generalized plant was constructed. Furthermore, the power controller design can thus be transferred into the H∞ output feedback control problem. Finally, the experiment was adopted to verify the H∞-MDP control strategy through comparison with the traditional power feedforward decoupling and the PI-MDP control strategy. The results indicate the H∞-MDP method can be applied to the single-phase PWM rectifier system effectively. © 2021, Harbin University of Science and Technology Publication. All right reserved.