A new direct power control strategy of three phase boost type pwm rectifiers

TLDR: In this article, the principle and properties of the direct power control (DPC) system for present three phase boost type PWM rectifiers based on its mathematical model are analyzed.

Abstract: This paper analysies the principle and properties of the direct power control (DPC) system for present three phase boost type PWM rectifiers based on its mathematical model. Switching table in power loop of DPC system controls instantaneous active power and reactive power ,leading to the fluctuation of power and DC voltage in temporary state and DC dynamic voltage drop during load current disturbance. This paper presents a new direct power control strategy based on alternate use of instantaneous active power and reactive power switching tables. Good control properties are achieved by the new control strategy. Meanwhile, DC dynamic voltage drop during load current disturbance is decreased and stable voltage drop is eliminated by the duty cycle of square wave to control double switching table based on load current feedback. The new control strategy is proved feasible by simulink and experiment.