Apparatus for power transmission

Apparatus for the transfer of electric power produced by at least one multi-phase alternating-current generator (1) or generator unit into at least one multi-phase alternating-current power network (U_u,U_v,U_w), said apparatus comprising at least one control unit (4), at least one non-controlled rectifier bridge (2), a direct-current intermediate circuit and at least one controlled inverter bridge (3) for supplying d.c. power into an alternating-current power network, said inverter bridge (3) having fully gate-controlled semiconductor switches (V11-V16) in its upper and lower branches, and said control unit controlling the semiconductor switches (V11-V16) of the inverter bridge (3) so as to cause them to conduct in such manner that: -in the upper branch, the switch in each phase conducts substantially as long as the instantaneous value of the network phase voltage (U_u,U_v,U_w) in question is the most positive, and -in the lower branch, correspondingly the switch in each phase conducts substantially as long as the instantaneous value of the network phase voltage (U_u,U_v,U_w) in question is the most negative. The rectifier bridge (2) is connected directly to the inverter bridge (3) without a d.c. capacitor unit functioning as an intermediate energy storage. In addition, the direct current output from the rectifier bridge (2) is conducted directly into those two a.c. network phases in which the magnitudes of the instantaneous values of the voltages are highest, without current limitation by an inductor unit.