This thesis is a part of the research carried out on a double stage grid connected photovoltaic system, associated with a shunt active power filter. In the first stage, the photovoltaic generator is connected to a boost DC-DC converter, acting through two MPPT algorithms, based on　 fuzzy logic and sliding mode control, to track permanently the optimum point, and injecting so the extracted amount to the grid. In the second stage, a two-level voltage source inverter is introduced, to fulfill two main roles: Ensuring the injection into the grid of the extracted power, and acting as an active filter to eliminate the effect of undesirable harmonics, caused by the non-linear load. In this context, various techniques, inspired from the direct power control have been implemented to improve the energy quality of the system