Institut Fuer Solare Energieversorgungs-technik (iset) Verein an Der Universitaet Gesamthochschule Kassel E.v.

Alfred Engler

A device for equal-rated parallel operation of at least two inductively coupled inverters without additional synchronisation and/or communication lines is described. Each inverter is provided respectively with a control circuit which is intended to control its output voltage, to which control circuit a reference voltage (u ) is supplied as desired voltage, the frequency (f) of which is derived from the active power (P) taking into account preselected frequency statics and the amplitude (&verbar;u&verbar;) of said reference voltage being derived from the reactive power (Q) of the relevant inverter ( ) taking into account preselected voltage statics. According to the invention a value for the phase (&phgr;) of the reference voltage (u ) is also derived from the active power (P) taking into account a preselected weighting coefficient (St1&prime;) by which oscillations and build-ups of the active power components can be avoided.

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Kassel, Germany

Alfred Engler