Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1996-10-25
1998-08-11
Wong, Peter S.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 54, 363 37, 363129, 307 42, H02J 300
Patent
active
057936226
ABSTRACT:
A common turn-off circuit for a thyristor power converter is specified. The common turn-off circuit is particularly suitable for AC converters such as, for example, railway grid couplings. The turn-off thyristors are directly connected to the secondary transformer windings. Additionally provided is a special freewheeling path via which the energy stored, in particular, in the transformer inductors or other relevant inductors can be drawn away. What is advantageous is the fact that all of the thyristors of the power converter can be turned off reliably and without any special precautions, since the common turn-off circuit is automatically ready for turning off. Overvoltages are avoided, moreover, by the special freewheeling path.
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D. Alexa, "Optimal Areitender unsymmetrischer selbstgefuhrter stromirichter", etzArchiv Bd. 7 (1985) H.12, pp. 409-411.
Werner Bosterling et al, Moderne Leistungshalbleiter in der Stromrichtertechnik, etzBd. 114 (1993) Heft 2, pp. 1310-1319.
Herausgegeben von Rudolf Lappe, "Leistungselektronik", Springer-Verlag Berlin Heidelberg New York London, Paris, Tokyo 1988, pp. 284-297.
Dahler Peter
Gaupp Osvin
Linhofer Gerhard O.
Tschudi Christoph
Asea Brown Boveri AG
Riley Shawn
Wong Peter S.
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