Research on new method of improvement of the dynamic ability for PWM rectifier

The three-phase voltage source PWM rectifier with direct current control is easy to generate inrush current during start-up period, and it is easily affected by load disturbance. This influences the reliability of ship electric propulsion system. For these issues, this paper presents a method to effectively restrain inrush current. Voltage square loop is used as the outer loop. At the same time, the current of capacitor in DC side is feed-forwarded as the reactive current reference during startup process. Besides, this paper proposes a method of new load current feed-forward control. The method can improve dynamic performance of system. Effectiveness and feasibility of the proposed method are validated by the simulation results.