Fuzzy PI Compound Control of PWM Rectifiers with Applications to Marine Vehicle Electric Propulsion System

Within a marine vehicle electric propulsion system, three-phase voltage source PWM rectifiers instantaneously produce larger impulse current and overshoot of DC voltage during the startup and load transients, and may lead to system instability; a fuzzy PI compound control scheme is proposed to replace the traditional PI controller in the voltage outer loop. In order to circumvent the defects of the traditional PI controller, the voltage outer loop is designed by combining a fuzzy controller and a PI controller. Moreover, fuzzy control rules are employed to online adapt parameters of the PI controller, and thereby enhancing the system robustness, and contributing to faster dynamic response and smaller overshoot. Simulation results demonstrate that the proposed control scheme can effectively suppress the impulse current and overshoot of DC voltage during the startup and load transients, and improve the anti-disturbance ability of the rectifier and the operation reliability of the marine vehicle electric propulsion system.