Electrical transmission or interconnection systems – Plural supply circuits or sources – Plural converters
Patent
1982-09-28
1984-07-10
Goldberg, E. A.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Plural converters
363 35, 363 67, 363 71, H02N 346
Patent
active
044594925
ABSTRACT:
A method of operating a high voltage DC transmission system with any number of transformer stations. Transformer stations which operate as rectifier stations operate with voltage regulation having a current dependent control input. In the range from 1 per unit to 1-.delta. per unit of rated voltage, a hard current limit is in effect, and in the range from 1-.delta. per unit to 1-.delta.-.epsilon. per unit rated voltage, the current limiting value is reduced to a minimum current, where .delta. and .epsilon. are preselected fractions. Transformer stations which operate as inverter stations principally operate with current regulation and in the voltage range from 1 per unit to 1-.delta. per unit of rated voltage, the maximum desired current value is reduced from rated current value down to zero.
REFERENCES:
patent: 4212055 (1980-07-01), Podlewaki
patent: 4328429 (1982-05-01), Kuslick
patent: 4379325 (1983-04-01), Krampe et al.
Comparison of Suitable Control Systems for HVDC Stations Connected to Weak AC Systems, by Ranade and Rumpf, May 1971, IEEE Trans. on Power, vol. PAS-91, No. 2.
Power Transmission by D.C. by Uhlmann, 1975.
Design & Testing of Thyristor Valves and their Components for the HVDC, by P. Lips, 9/1/82.
Goldberg E. A.
Jennings Derek S.
Licentia Patent-Verwaltungs-GmbH
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