Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1994-03-03
1995-08-29
Stephan, Steven L.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 43, 363 71, 307105, H02M 112
Patent
active
054466423
ABSTRACT:
A harmonic blocking converter system for converting power between an AC source and a DC source includes a harmonic blocking transformer and a converter which generates undesirable harmonic currents including fifth and seventh harmonic components. The harmonic blocking transformer includes a polyphase main transformer and a harmonic blocker coupled with wye and delta secondary windings of the main transformer, so as to substantially block passage of the fifth and seventh harmonic currents to the AC source. A waveform enhancer may couple the harmonic blocking transformer with the converter. The converter may be constructed for 2-level operation, or, with the addition of auxiliary diodes, for 3-level operation. Such a harmonic blocking transformer and a method of blocking undesirable harmonic currents are also provided.
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Berhane Adolf
Electric Power Research Institute Inc.
Stephan Steven L.
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