Abstract
This paper presents a nonlinear observer-based control strategy for a photovoltaic system. This last consists of a photovoltaic generator PVG coupled to a three phase load and three phase grid by a three phase voltage source inverter VSI without DC-DC converter. The controller is developed by using Backstepping method based on d-q transformation of a new model of the global system. Then, to minimize the number of sensors used for the implantation of the controller, a nonlinear state observer is proposed for estimate the inverter current. The main objectives of this control strategy are to extract maximum power from the PV array with very good effectiveness and to achieve the unity power factor and low harmonic distortion in the level of the grid power flow. The simulation results proved that the observer-based control method has been achieved all the objectives with high dynamic performance under different operating conditions such as atmospheric conditions changes and system disturbance.
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