Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1986-03-21
1988-02-23
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 51, H02J 336, H02H 710
Patent
active
047274670
ABSTRACT:
Upon the occurrence of a change of an a.c. voltage amplitude of an a.c. power network line in one station A, a computing element generates a first pilot control variable by means of which the control angle of the respective static converter is shifted in terms of a reduction of its d.c. output voltage. In the other station a voltage correction regulator generates a correction variable by compensating the voltage drop in the HVDC transmission line, by means of which the control voltage of the respective static converter is corrected, which, for example, is generated by a pilot control voltage and the output signal of a marginal current or extinction angle regulator. Thus, even in case of an a.c. power network fault-induced voltage dip of the HVDC voltage, a preset value can be maintained for the HVDC current and the voltage dip in the power transmission be reduced. This procedure is independent of which station is operated as rectifier and which as inverter.
REFERENCES:
patent: 4177507 (1979-12-01), Leete
patent: 4320444 (1982-03-01), Hausler et al.
patent: 4379325 (1983-04-01), Krampe et al.
patent: 4475150 (1984-10-01), d'Atre et al.
patent: 4516198 (1985-05-01), Liss
patent: 4639848 (1987-01-01), Sakai
I.E.E. Proceedings, vol. 131, Part C, No. 4, Jul. 1984, "Combined Control and Protection System for Improved Performance of HVDC Links in the Presence of AC Faults", by Galanos et al.
I.E.E. Proceedings, vol. 127, Part C, No. 1, Jan. 1980, "Fault Studies in AC Systems Interconnected by HVDC Links", by Arrilaga et al.
Bendl Franz-Wolfgang
Kaufhold Wolfgang
Wild Georg
Beha Jr. William H.
Jay Mark H.
Siemens Aktiengesellschaft
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