Device for parallel operation of equal range single-phase or three-phase voltage sources

A device for the parallel operation of at least two inductively coupled inverters without additional synchronization and / or communication device is described. Each inverter is provided with a control circuit for regulating its output voltage, to which a reference voltage (u¶ref¶) is supplied as nominal voltage, the frequency (f) taking into account a preselected frequency statics (St1) from the active power (P) and its amplitude DOLLAR I1 is derived from the reactive power (Q) taking into account a preselected voltage statics. According to the invention, active power oscillations between the inverters are avoided by introducing a phase precontrol (St1 ') (FIG. 4).