Abstract
This paper presents a control strategy for a grid connected system fed by a photovoltaic (PV) source. A two stages topology with boost converter followed by a three phase VSI (voltage source Inverter) is used for the grid interface. The boost DC converter is controlled using an Incremental conductance maximum power point tracking technique in order to feed the maximum of power to the grid in the normal grid voltage mode. In this paper, an additional dc-bus voltage regulator is added in the control of the boost for ensuring the operation of the proposed system in the case of low grid voltage or voltage sag as well as in the normal grid voltage mode. The proposed system is simulated via the MATLAB/SIMULINK and the validity of the proposed concept is confirmed and the performance of the proposed control is satisfactory.
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