Patent ID: 6693809
Filing Date: 2004-02-17
Classification: H02M

Abstract:
Device for equal-rated parallel operation of inductively coupled inverters (1, 2), comprising a common supply line (3) to which said inverters (1,2) are connected via network coupling impedances (4,5), each inverter (1,2) being provided respectively with a control circuit (7), which is intended to control its output voltage, a reference voltage (uref) being supplied as desired voltage to said control circuit (7), wherein a frequency (f) of said reference voltage (uref) is derived from an active power (P) of a relevant inverter (1,2) taking into account preselected frequency statics, wherein an amplitude (|u|) of said reference voltage is derived from a reactive power (Q) of said relevant inverter (1,2) taking in to account preselected voltage statics, and wherein a value for a phase (&phgr;) of said reference voltage is also derived from said active power (P) taking into account a preselected weighting coefficient (St1â€²).