A Dynamic Equivalent Current Feedforward Control Strategy With Variable Reference Current in Three-Phase PWM Rectifiers

In three-phase PWM rectifiers, the variation of the DC side load may be frequent and violent, and the DC bus voltage is prone to oscillate greatly. While the dynamic response and the steady-state characteristics of the DC bus voltage are important to the DC bus side load of PWM rectifiers. Therefore, it is necessary to improve the anti-load disturbance ability, ensuring the resilient operation of PWM rectifiers. In the traditional voltage vector control method, due to the hysteresis of the PI regulator employed in the closed-loop control, it is difficult to obtain good dynamic performance of PWM rectifiers under load disturbance. Thus, this paper proposes a dynamic equivalent current feedforward control strategy with the variable reference current employed in the current loop controller. The proposed strategy effectively reduces the DC bus voltage oscillation and shortens the dynamic response time when a load disturbance happens. Finally, the experimental results have been validated the feasibility and effectiveness of the proposed method.