Method and apparatus to operate a high-voltage dc...

Details Method and apparatus to operate a high-voltage dc... Method and apparatus to operate a high-voltage dc...

H - Electricity

02

M

321/24

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

Patent

CA 1233198

VPA 84 P 3439 ABSTRACT In a first station operating as the rectifier, a fault indication quantity can replace the measured value of the HVDC voltage which regulates a control voltage. In normal operation in a second station of an HVDC transmission system operating as an invertor, a fault indication quantity is calculated from a control angle and the inductive D.C. voltage drop is calculated from the D.C. current and the A.C. voltage. In the second station operating as the inverter, the overlap angle can be precalculated from a fault indication quantity so that by automatic control of the control angle a preset extinction angle can be assured. Thereby stable, quickly controllable operation without any remote control signals is assured and rapid resumption of operation following a malfunction facilitated.

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