Method and system of controlling high voltage direct current pow

Details Method and system of controlling high voltage direct current pow Method and system of controlling high voltage direct current pow

1977-12-30

1980-07-01

Miller, J. D.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 35, 363 37, 363 79, H02H 700, H02J 336

Patent

active

042109566

ABSTRACT:
In a method and system for controlling high voltage direct current power transmission plants, the delay angle for the each converter is calculated directly by a calculating arrangement, which is provided for controlling all converters totally, from data set by an operator and data transmitted by suitable sending-receiving apparatus from each converter. Each converter receives the delay angle signal by suitable sending-receiving apparatus from the calculating arrangement and operates in accordance with the received delay angle value.
The delay angle value is given the following equation. ##EQU1## where .alpha. is a delay angle value. E is either a measured or calculated A.C. voltage, and if it is a measured voltage, it is the voltage from an A.C. system to which each converter is connected, V is either a set or calculated D.C. voltage, I.sub.d is either a set or calculated D.C. current and X is a converter commutation reactance.

REFERENCES:
patent: 3467848 (1969-09-01), Ainsworth
patent: 3470442 (1969-09-01), Ainsworth
patent: 3659186 (1972-04-01), Machida et al.
patent: 3670236 (1972-06-01), Ekstrom
patent: 3701938 (1972-10-01), Chadwick
patent: 3829756 (1974-08-01), Hockstetter
patent: 3891912 (1975-06-01), Watanabe
patent: 3906335 (1975-09-01), Watanabe et al.
patent: 3992659 (1976-11-01), Ekstrom

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