US 7,321,500 B2
Electric power converter
Gunnar Asplund, Ludvika (Sweden); Ying Jiang Häfner, Ludvika (Sweden); Johan Lindberg, Göteborg (Sweden); Peter Lundberg, Västeräs (Sweden); Jan Svensson, Västeräs (Sweden); and Rolf Pålsson, Saxdalen (Sweden)
Assigned to ABB Technology Ltd., Zürich (Switzerland)
Filed on Apr. 28, 2006, as Appl. No. 11/413,004.
Claims priority of provisional application 60/675845, filed on Apr. 29, 2005.
Prior Publication US 2006/0256587 A1, Nov. 16, 2006
Int. Cl. H02J 3/36 (2006.01); H02M 5/45 (2006.01)
U.S. Cl. 363—35  [363/37] 20 Claims
OG exemplary drawing
 
1. A voltage source converter for high power application, comprising:
a plurality of valves, each valve comprising a plurality of extinguishable semiconducting elements, and
a valve control unit configured to control the voltage source converter via an executing pulse-width modulation signal,
wherein the valve control unit comprises a first control unit, a first pulse-width modulator for providing a first pulse-width modulation signal according to a fast dynamic control, a second control unit, a second pulse-width modulator for providing a second pulse-width modulation signal according to a slow dynamic control, a mode detector configured to detect a first mode of operation of the voltage source converter and a second mode of operation of the voltage source converter, and a selector connected to the first pulse-width modulator and second pulse-width modulator for selecting in dependence of the mode detector, the second pulse width modulation signal during the first mode of operation and the first pulse width modulation signal during a second mode of operation as the executing pulse-width modulation signal.