Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1995-05-22
1996-05-07
Wong, Peter S.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363 41, 363 64, 363 71, H02M 75387
Patent
active
055152643
ABSTRACT:
A voltage sourced inverter system includes an inverter for coupling to a DC power source and an interphase transformer bank coupled to the inverter. The inverter includes a number of poles for providing discretely displaced voltage waveforms to the interphase transformer bank. A main transformer operably coupled to the interphase transformer bank transforms power therefrom into an AC power output. The interphase transformer bank may be a singular stage or a hierarchial arrangement of plural interphase transformers which combine the discretely displaced voltage waveforms to reduce selected harmonic components therefrom. The inverter may provide notched waveforms to remove additional selected harmonics from the discretely displaced voltage waveforms. A method of inverting DC power into AC power with reduced selected harmonic components is also disclosed.
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Appendix A, FIGS. 2 and 3: Eric J. Stacey, "Advanced Static VAR Compensators Report: Power Circuit Configuration," (Westinghouse), viewgraphs from a presentation of this paper on May 10, 1990, Eric J. Stacey showing the zero sequence blocking transformer disclosed in Stacey's U.S. Pat. No. 4,870,557 of record, as annotated by the above-named inventor to show the location of the high voltage bushings.
Appendix A, FIGS. 4 and 5: Drawings of known prior art systems made by William McMurray while under contract to the assignee of the above-identified application in Jul. 1990.
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Berhane Adolf
Electric Power Research Institute Inc.
Wong Peter S.
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