Modeling and Optimization of a Grid Connected Photovoltaic Energy Conversion System Based on Advanced Nonlinear Control

The electrical characteristics of photovoltaic generators are nonlinear, they are depend on the climatic conditions and the load, and they admitted one only optimum operating point. Therefore, to maximize the energy produced by the PV system, it is necessary to track the maximum power point. Nevertheless to inject this maximum energy produced in the grid, it must be converted in an alternative by ensuring a reliable transfer with a unit power factor and a currents form purely sinusoidal. In this paper, a nonlinear method based on sliding mode (SMC) is applied to control and optimization of a grid connected photovoltaic energy conversion system. In this method, it is essential to define a sliding surface that presents the desired state, then we calculate the appropriate control law to achieve this desired state. To validate the theory results obtained by the proposed control strategy, the simulations has been affected on the Simulink/Matlab software for a 100Kw PV system. The simulation results are shown the effectiveness of the proposed technique to achieve the optimal operation of grid connected photovoltaic energy conversion system.