Control system for power conversion system

Details Control system for power conversion system Control system for power conversion system

1996-12-23

1998-04-07

Berhane, Adolf

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 71, 363 95, H02M 748

Patent

active

057372063

ABSTRACT:
A control system for a power conversion system composed of a plurality of unit converters and a transformer for connecting AC outputs of the converters in series. The control system includes a unit for detecting an AC system voltage at the primary winding of the transformer, a unit for generating a command voltage vector of a voltage output from the power conversion system at the primary winding of the transformer based on the AC system voltage, and a unit for generating a plurality of actual voltage vectors of voltages output from the power conversion system at the primary winding of the transformer. The control system further includes a unit for selecting one of the actual voltage vectors that is the closest to the command voltage vector to generate as a selected actual voltage vector, and a unit for calculating a plurality of voltage vectors based on the selected actual voltage vector and for generating a plurality of ON-OFF commands for the self-turn-off devices, each determined by one of the voltage vectors, respectively, whereby to control the power conversion system so as to generate the selected actual voltage vector that is the closest to the command voltage vector at the primary winding of the transformer.

REFERENCES:
patent: 3876923 (1975-04-01), Humphrey et al.
patent: 4663702 (1987-05-01), Tanaka
patent: 4677535 (1987-06-01), Kawabata et al.
patent: 4800478 (1989-01-01), Takahashi
patent: 5212630 (1993-05-01), Yamamoto et al.
patent: 5257180 (1993-10-01), Sashida et al.
patent: 5446645 (1995-08-01), Shirahama et al.
patent: 5623192 (1997-04-01), Yamamoto

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