Fuel Cells are destined to supply electric energy beginning from primary resources. A static DC-AC converter is necessarily inserted between the fuel cells and the distribution network. This paper describes a new P.W.M. strategy for a current source inverter. This modulation strategy reduces the energy losses and harmonics in the P.W.M. current source inverter. This technique allows the P.W.M. current source inverter to become a new feasible solution to adapt a low continuous voltage into a three-phase voltage of higher amplitude.