Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Reexamination Certificate
2006-01-03
2006-01-03
Vu, Bao Q. (Department: 2838)
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
C363S039000, C363S126000
Reexamination Certificate
active
06982884
ABSTRACT:
An 18-pulse converter is constructed using two, high zero-sequence impedance, phase-shifting autotransformers to parallel two 3-phase bridge converters. A third 3-phase bridge converter is directly connected to the power source. Depending on the DC filtering technique, the kVA rating of each autotransformer is 15 to 22% that of the DC load kW. The method facilitates paralleling of 3-phase bridge converters to reduce system AC line current harmonics, and is suitable for 18, 24, 36, and higher pulse numbers. The minimum number of individual autotransformers required is (n−1), where n is the number of 3-phase bridge converters. Due to the high zero-sequence impedance of the autotransformers, only a small DC load is needed to limit the DC output voltage. AC line reactance may be included in series with each converter, or in the 3-phase AC power source, to further reduce AC line current harmonics.
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patent: 5619407 (1997-04-01), Hammond
patent: 5781428 (1998-07-01), Paice
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patent: 6101113 (2000-08-01), Paice
patent: 6198647 (2001-03-01), Zhou et al.
patent: 6525951 (2003-02-01), Paice
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