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A nonlinear control methodology for single-phase grid connected of photovoltaic generator is presented in this paper. It consists of a PV arrays, a voltage source Multicellular inverter, a grid filter and an electric grid. The controller objectives are threefold: i) ensuring the Maximum power point tracking (MPPT) in the side of PV panels, ii) guaranteeing a power factor unit in the side of the grid, iii) ensuring a good convergence of the voltages across the flying capacitors. On the basis of the nonlinear model of the entire system, the controller is carried out using an approach of Lyapunov. The simulation results have been performed through Matlab/Simulink environment