Electric power conversion systems – Current conversion – Having plural converters for single conversion
Patent
1997-08-29
2000-04-18
Wong, Peter S.
Electric power conversion systems
Current conversion
Having plural converters for single conversion
363 43, 363 37, H02M 700, H02M 112
Patent
active
060522968
ABSTRACT:
A power converter circuit arrangement which comprises a first power converter and at least one further power converter is specified. The power converters are connected to the DC voltage intermediate circuit and feed a load circuit, in particular a single-phase railway grid. The or each further power converter has an output transformer on the load side. The secondary windings of the output transformers are connected in series with the primary winding of a load transformer, which feeds the load circuit, and the load-side terminals of a first power converter. This permits the turns ratios of the output transformers to be selected to be greater than or equal to one and said turns ratios between said output transformers to be selected to be gradated in a binary or ternary manner, for example. As a result, power converter stages having a gradated output voltage are available, and a finely stepped approximation to a sinusoidal output voltage can be achieved without the necessity of providing an uneconomically large number of stages.
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Dahler Peter
Gaupp Osvin
Gruning Horst
Asea Brown Boveri AG
Patel Rajnikant B.
Wong Peter S.
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