Control apparatus for d.c. power transmission system.

摘要

This invention relates to an apparatus for controlling a D.C. power transmission system having a separately-excited converter (3) which is connected between a first A.C. system (1) and D.C. power transmission lines (6) and which performs power conversion between A.C. power and D.C. power, and a self-excited converter (4) which is connected between the D.C. power transmission lines (6) and a second A.C. system (2) 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 (1, 2) are associated by direct current, a control apparatus for a D.C. power transmission system according to this invention comprises a voltage detector (10) which detects a D.C. voltage of the D.C. power transmission lines (6), first control means (16) for comparing the output of the voltage detector (10) with a voltage reference signal and controlling ignition of the self-excited converter (4) in accordance with a deviation of the comparison, a detector (18) which detects the conversion power of the separately-excited converter (3), and second control means (17) for comparing the output of this detector (18) with a power reference signal and controlling ignition of the separately-excited converter (3) in accordance with a deviation of the comparison.