This　paper　presents　new　alternatives　of　design　and　control　for　three-phase　grid　connected　photovoltaic　systems　(GCPS).　In　this　work,　the　photovoltaic　generation　(PVG)　source　is　connected　to　the　main　electric　grid　via　two　power　electronics　stages.　The　first　stage　consists　on　a　buck-boost　dc-dc　converter　that　insures　impedance　adaptation　between　the　PVG　and　the　grid.　This　converter　is　controlled　by　the　sliding　mode　control　(SMC)　to　track　the　dc　reference　voltage　required　by　the　main　grid.　The　second　stage　is　composed　by　a　dc-bus　and　a　three-phase　voltage　inverter　used　to　interface　the　PVG　with　the　grid　utility.　The　inverter　is　controlled　by　the　direct　power　control　(DPC)　in　order　to　inject　the　PV　power　into　the　main　grid　with　a　high　quality　power　factor.　The　model　of　the　GCPS　has　been　implemented　in　the　Matlab/Simulink　software,　and　simulation　studies　and　experimental　results　have　been　presented　to　demonstrate　the　effectiveness　of　the　proposed　system.