Method and system of controlling high voltage direct current...

Details Method and system of controlling high voltage direct current... Method and system of controlling high voltage direct current...

H - Electricity

02

M

321/22

H02M 5/00 (2006.01) H02J 3/36 (2006.01)

Patent

CA 1104206

METHOD AND APPARATUS FOR CONTROLLING HIGH VOLTAGE DIRECT CURRENT POWER TRANSMISSION SYSTEMS ABSTRACT OF THE DISCLOSURE In a method and system for controlling high voltage direct current power transmission systems, the delay angle for the each converter is calculated directly by a calculating arrangement, which is provided for controlling all converters totally, from data set by an operator and data transmitted by suitable sending-receiving apparatus from each converter. Each converter receives the delay angle signal by suitable sending-receiving apparatus from the calculating arrangement and operates in accordance with the received delay angle value. The delay angle value is given the following equation. Image where .alpha. is a delay angle value. E is either a measured or calculated A.C. voltage, and if it is a measured voltage, it is the voltage from an A.C. system to which each converter is connected, V is either a set or calculated D.C. voltage, Id is either a set or calculated D.C. current and X is a converter commutation reactance.

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