The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 17, 2004
Filed:
Aug. 16, 2002
Alfred Engler, Kassel, DE;
Abstract
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 (|u|) 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′) by which oscillations and build-ups of the active power components can be avoided.