Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1997-09-05
1999-03-30
Wong, Peter S.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363 37, 363 96, 323207, H02M 545, H02M 324, H02M 7521, G05F 170
Patent
active
058896686
ABSTRACT:
A three-phase dc to-ac power inverter includes a dc power source with a first dc node for positive voltage, a second dc node for negative voltage, and a third dc node for zero voltage. A set of three-level pole circuits are connected to the first dc node, the second dc node, and the third dc node of the dc power source. A control circuit, responsive to an inverter voltage vector reference demand signal with a voltage magnitude reference demand component and a voltage phase reference demand component, generates pole control signals for the three-level pole circuits using logic circuitry which combines phase indexed digital waveform values stored in a pair of lookup tables. The pole control signals force the three-level pole circuits to generate a set of phase-shifted waveforms with zero voltage components. The phase-shifted waveforms are combined by a set of transformers to produce a three-phase output voltage with a harmonic content lower than the harmonic content of the phase-shifted waveforms.
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Schauder Colin David
Williams Scott Lawrence
Electric Power Research Institute Inc.
Vu Bao Q.
Westerhoff Richard V.
Wong Peter S.
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