| 摘要 |
A method is specified for exchanging power between a multi-phase AC voltage system (10) and an electrical subscriber (4, 6, 8) via a unipolar voltage intermediate circuit (16), wherein a multi-phase inverter (18) connected to the AC voltage system (10) via centre taps (50, 51, 52) of switchable half bridges (40, 41, 42) shares the voltage intermediate circuit (16) with the electrical subscriber (4, 6, 8), through synchronised switching of the centre taps (50, 51, 52) between an upper intermediate circuit rail (36) and a lower intermediate circuit rail (37) of the voltage intermediate circuit (16). In the process, it is envisaged that the inverter (18) is predominantly operated according to the modulation method of a single-phase synchronisation, wherein the intermediate circuit voltage (UDC) is modulated with an alternating component such that the power exchange with the AC voltage system (10) is performed via low-harmonic-content phase currents (IR, IS, IT). In addition, a corresponding circuit (30) is specified. |
