Method for controlling a H.V.D.C. power transmission plant and a

Details Method for controlling a H.V.D.C. power transmission plant and a Method for controlling a H.V.D.C. power transmission plant and a

1986-01-27

1987-06-09

Salce, Patrick R.

Electric power conversion systems

Current conversion

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

363 51, H02J 336

Patent

active

046725199

ABSTRACT:
An HVDC power transmission plant with a rectifier station and an inverter station interconnected by a d.c. power transmission line is disclosed. The plant has a communication link for transmitting control information between the stations, at least one of which having at least two parallel-connected converters. If protective blocking of a faulty converter is made in a faulty station during a period when the communication link is not available, the line voltage and line current are temporarily reduced to zero in the rectifier station. In the faultless station, this state is detected and the minimum value of the control angle of the converters of the faultless station is temporarily increased. After output from the rectifier station has been restored, the line current is measured and the current order in the faultless station is set at the measured value, taking account of the current margin. Thereafter, the minimum value of the control angle is reduced to its normal value, thereby restoring normal operation of the plant.

REFERENCES:
patent: 3883790 (1975-05-01), Hammarlund et al.
Fink, Carrolla, "Standard Handbook for Electrical Engineers", McGraw-Hill, 1968, 10th edition, Section 14.1-14.53.
Uhlmann, "Power Transmission by Direct Current", Springer-Verlag, 1975, pp. 131-152.
Nozari et al., "Current Order Coordination in Multi-Terminal DC Systems", IEEE vol. PAS 100, No. 11, pp. 4628-4635.
Hauth et al., "Multi-Terminal HVDC Control Techniques . . . ", Sep. 1-9, 1982, Cigre Intl. Conference, Report 14-01.

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