Grid connected photovoltaic system controlled by SMC

This work deals with a non-linear technique to control a grid connected photovoltaic system. Sliding-Mode Controller (SMC) is proposed to offer a proper and a rapid maximum power point tracking to control the boost converter. To guarantee the SMC stability, three conditions are fulfilled and performed: transversality, reachability and equivalent control. The Sliding-Mode approach is applied also to control the Grid Side Converter (GSC) to inject active and reactive power into the grid. To demonstrate the effectiveness of the proposed techniques. the mathematical system modelling and simulations are carried out by means of PSIM software under different solar irradiance changing levels meanwhile the temperature value is kept constant, equal to 25°C. It prove the good performance, the perfect maximum power tracking and the unity power factor condition is verified.