Abstract
The photovoltaic generators are characterized by a nonlinear electrical characteristics that admit one only maximum power point (MPP). Therefore, the maximum power point tracking (MPPT) is very essential to improve the photovoltaic systems efficiency. This paper presents a robust method to control and optimization of a grid-connected photovoltaic (PV) energy conversion system .The control design is based on a nonlinear sliding mode control (SMC)-Backstepping control (BSC) approach. The principal aim of this work is to develop the sliding mode technique for having a grid-connected PV system with a goods performances. The SMC is ameliorated by associate it with the Backstepping technique, it is applied to track the maximum power from the PV panels, and also, to ensure an independent control of the active (P) and reactive (Q) powers. In this control strategy the stability is verified by the Lyapunov approach. The simulations results has been realized in Simulink/Matlab and they have shown that the proposed system present a good robustness with the SMC-BSC method.
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