Decoupled control of active and reactive power for three phase PWM rectifiers

This paper proposes a new control schemes for three phase PWM rectifiers which is easy to implement. The method is based on decoupled control of instantaneous active and reactive power components, where the corresponding reference ac line currents are obtained using two PI-controllers loops. One PI controller is for the active power loop and the other is for the reactive power component. This scheme can be considered as simplified direct power control valid for both three-phase and single-phase PWM rectifiers. Both dynamic and steady state performance are studied. According to the obtained results, the control scheme offers several advantages such as: control of dc side voltage, fast dynamic performance, and sinusoidal ac line currents. Moreover, the proposed scheme does not require high sampling rates which was the major drawback of conventional direct power control strategy.