System for converting at least one electrical input direct current into an electrical polyphase output alternating current

A system for converting at least one electrical input direct current into an electrical output alternating current comprising a plurality M of phases and supplied to M output terminals, each output terminal corresponding to one phase of the output current, of the type comprising:

• N polyphase inverters, connected in parallel with each other and each connected to a bus for circulation of an electrical input direct current, each inverter being suitable for converting the input direct current into an intermediate alternating current comprising M phases and supplied to M intermediate terminals, each intermediate terminal corresponding to one phase of the intermediate current;
• N×M first electromagnetic coupling coils, each being connected by one of its ends to a respective terminal of the M intermediate terminals of one of the N polyphase inverters;
• N×M magnetic cores, each first electromagnetic coil being wound around a respective core,
• wherein it comprises N×M second electromagnetic coupling coils, each being connected by one of its ends to the other end of a respective first coupling coil and wound around a distinct core from that of the respective first coil, in that a first coupling coil and a second coupling coil are wound around each core, in that the first and second coils of a same core correspond to a same phase of each intermediate alternating current, and in that the first and second electromagnetic coils respectively are intended to be passed through by a respective common mode current, and arranged in such a way that for each magnetic core, the common mode flux generated by the first coil is of the opposite direction to the common mode flux generated by the second coil, each output terminal of the system being connected to the other ends of the M second coils corresponding to a same phase of the intermediate alternating currents.