Converter circuit

A power converter circuit for voltage maintenance in an alternating voltage supply network (1) is specified, wherein the alternating voltage supply network (1) has for each phase (R; S; T) an associated voltage source (UR; US; UT) for supplying an electrical load (2), wherein the power converter circuit has for each phase (R; S; T) respectively an inverter (3) which is connected on the direct voltage side via a storage capacitor (4) to a supply device (5). Each inverter (3) is connected on the alternating voltage side in series in the respective phase (R; S; T) between the associated voltage source (UR; US; UT) and the electrical load (2), wherein the supply device (5) is connected on the alternating voltage side to at least two phases (R; S; T) between the associated voltage sources (UR; US; UT) and the respective inverters (3).