DC Bus Voltage Switched Control Method for Three Phase Voltage Source PWM Rectifier under Rapidly Varying Dynamic Load

More electric aircraft referred to as the general move in the aerospace industry to increase the amount of electrically powered equipment on future aircraft. One of the most important kind of electric loads of the future more electric aircraft is the aircraft electric actuator but its power characteristics possesses rapidly varying nature in the wider range and constant power nature in the small signal sense. Due to the problem of varying nature of power characteristics the problem of flexible voltage regulation under dynamic loads arises. For solving this problem dc-bus voltage switched control method of three phase voltage source pwm rectifier is presented in this paper. Several linear controllers are designed on different operating points of the voltage source rectifier, and one controller is implemented according to certain switching law. The stability is checked by the common lyapunov function method. Simulation results showed the desired control performance is obtained. In comparison of classical PI controller the results of switched controller achieves considerable reduction in the dip and overshoot of the dc bus voltage under an aircraft’s electric actuator load.