A simple active-power control technique for grid-connected three-phase inverters at unity power factor

This paper presents a simple active-power control technique for low voltage grid-connected three-phase inverters with zero injected reactive power (unity power factor at grid). Two versions of the proposed controller are introduced, namely, open-loop and closed loop controllers. The proposed controller is characterized by lower computational burden and reduced number of sensors, which are desired features for low-cost systems. The performance of the proposed controllers is studied during normal as well as abnormal operating conditions.