Control apparatus for D.C. power transmission system

Details Control apparatus for D.C. power transmission system Control apparatus for D.C. power transmission system

1982-09-22

1985-11-26

Beha, Jr., William H.

Electric power conversion systems

Current conversion

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

363 51, 363 49, 363 87, 363 96, H02M 545

Patent

active

045557500

ABSTRACT:
This invention relates to an apparatus for controlling a D.C. power transmission system having a line-commutated converter which is connected between a first A.C. system and D.C. power transmission lines and which performs power conversion between A.C. power and D.C. power, and a forced-commutated converter which is connected between the D.C. power transmission lines and having a second A.C. system and which performs power conversion between A.C. power and D.C. power. In order to control transmission power in the two-terminal D.C. power transmission system wherein the two A.C. systems are associated by direct current, a control apparatus for a D.C. power transmission system according to this invention includes a voltage detector which detects a D.C. voltage of the D.C. power transmission lines, a first control circuit for comparing the output of the voltage detector with a voltage reference signal and for controlling ignition of the self-excited converter in accordance with the comparison, a detector which detects a current which is proportional to the conversion power of the line-commutated converter, and a second control circuit for comparing the output of the current detector with a power reference signal and for controlling ignition of the line-commutated converter in accordance with the comparison.

REFERENCES:
patent: 3470442 (1969-09-01), Ainsworth
patent: 3543129 (1970-11-01), Boksjo
patent: 4307442 (1981-12-01), Yano et al.
New Static VAR Control Using Force-Commutated Inverters, Yoshio Sumi et al., 1981 IEEE 81 WM 228-6, pp. 1-9, FIGS. 1,2 and 6.
Development and Field Experience of New Static VAR Supply and Control System Using Force-Commutated Inverters, Y. Harumoto et al., IEEE International Conference on "Thyristor and Variable Static Equipment for AC and DC Transmission", Nov. 30-Dec. 30, 1981, pp. 29-32, FIG. 1

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