Patent Number: 6,885,171

Title: Compensation of reactive power via a frequency converter

Abstract: A method and an apparatus for compensating reactive power and/or harmonic currents in an alternating-current network by means of a frequency converter (1) feeding an alternating-current load (3), which frequency converter has a mains bridge (10) and at least one load bridge (11), said bridges being provided with controllable semiconductor switches. In the method, the reactive power and/or harmonic currents in the alternating-current network are measured, the load of the mains bridge of the frequency converter is measured, and the reactive power and/or harmonic currents in the alternating-current network are compensated by means of the frequency converter when the mains bridge is running at less than full capacity or has no load.

Inventors: Karppinen; Veijo (Vaasa, FI), Komulainen; Risto (Klaukkala, FI)

Assignee: Vacon Oyj

International Classification: H02M 5/458 (20060101); H02J 3/18 (20060101); H02P 23/00 (20060101); H02M 5/00 (20060101); H02J 003/18 ()

Expiration Date: 4/26/02017