Control equipment for high voltage direct current transmission s

Details Control equipment for high voltage direct current transmission s Control equipment for high voltage direct current transmission s

1993-01-29

1996-07-09

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 37, H02J 338, H02M 545

Patent

active

055351131

ABSTRACT:
A high voltage dc transmission system uses equipment of self-commutated converters each of which comprises switching devices with a self-commutating (gate-turn-off) function. A first control equipment associated with the rectifier comprises a constant reactive power (var) control circuit for holding constant the reactive power on the input side of the rectifier, and a constant dc voltage control circuit for holding constant the dc system voltage on the output side thereof. A second control equipment associated with the inverter comprises a constant reactive power control circuit for holding constant the reactive power on the output side of the inverter, and a constant active power control circuit for holding constant the active power on the output side thereof. The first control equipment and the second control equipment each have a current control circuit for making independent control of each component of a two-phase current resulted from transformation of a three-phase ac current.

REFERENCES:
patent: 4649466 (1987-03-01), Rogowsky
patent: 4689733 (1987-08-01), Guth et al.
patent: 4769751 (1988-09-01), Schraudolph et al.
patent: 4797799 (1989-01-01), Inokuchi et al.
patent: 4837671 (1989-06-01), Wild et al.
patent: 4862340 (1989-08-01), Inokuchi
patent: 5396411 (1995-03-01), Konishi et al.
patent: 5414612 (1995-05-01), Bjorklund et al.
Y. Tokiwa, "Application of a Digital Instantaneous Current for Static Induction Thyrristor Converters in the Utility Line," PCIM '88 Proceedings III, pp. 344-346.

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