Sliding mode control strategy for grid connected PV system

This paper focuses on the control strategy for three-phase grid connected photovoltaic (PV) system using direct power control. It is based on an external control loop, carried out to regulate the dc link voltage, and two internal controls loop. These later are based on direct sliding mode controller, utilized to control the line current in variable reference frame. A second order generalized integrator and frequency looked loop is investigated to ensure the grid system synchronization. Numerous simulation results are presented to confirm the performance of the studied method.