Compensation of reactive power via a frequency converter
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United States of America Patent
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Apr 26, 2005
Grant Date -
Apr 1, 2004
app pub date -
Aug 27, 2003
filing date -
Aug 27, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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