Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1989-12-05
1990-10-16
Wong, Peter S.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 46, 363 84, 363 95, H02M 112, H02M 114
Patent
active
049640275
ABSTRACT:
A power generating system (10) in accordance with the present invention includes a converter (14) for producing an AC output (16) including a fundamental and at least one harmonic of the fundamental; a frequency analyzer (18), having at least one input coupled to the AC output, for providing an analysis of a frequency spectrum of the AC output; a processor (36), coupled to the frequency analyzer, for calculating at least one switching frequency, each switching frequency being used for transforming a different harmonic within the AC output back to the fundamental; a controller (34), responsive to the at least one calculated switching frequency, for producing control signals at the at least one calculated frequency for transforming the at least one harmonic back to the fundamental; a separating filter (24), coupled to the AC output, for separating the fundamental and that at least one harmonic; at least one converter (30 and 32), coupled to the at least one harmonic from the converter and to the controller, each converter being switched by control signals from the controller which have a calculated switching frequency for transforming at least one of the at least one harmonic to the fundamental; and outputs from the at least one converter being combined with the fundamental from the separating filter.
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patent: 4382275 (1983-05-01), Glennon
patent: 4682369 (1987-07-01), Schrader
patent: 4761725 (1988-08-01), Henze
Cook Alexander
Hitt David H.
Rice John N.
Sundstrand Corporation
Wong Peter S.
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