Method of operating a high voltage direct current...

Details Method of operating a high voltage direct current... Method of operating a high voltage direct current...

H - Electricity

02

M

321/23

H02M 5/45 (2006.01) H02J 3/36 (2006.01) H02M 7/757 (2006.01)

Patent

CA 1180755

ABSTRACT OF THE DISCLOSURE 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.

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