Sliding mode control of reactive power for Three-Phase Grid-Connected Photovoltaic System

In Grid-Connected PV system should not be limited injecting the active power into the grid. However, it must be able to absorb or to generate sufficient reactive power for a certain amount of time according to the grid demand and maintain the grid voltage. This paper proposes sliding mode control that controls powers respectively the active and the reactive power for a Three-Phase Grid-Connected PV System. The sliding mode control based on dq transformation, after determining the desired voltage of the inverter v(q) and v(d) in the rotating frame, which means a reactive power quantity that defines the angle phase between the grid current and voltage. This controller is simulated on a 10 MW PV generator system using Matlab/SIMULINK. According to the simulation results prove the efficiency and robustness of the sliding mode control to regulate the injected reactive power.