Patent ID: 8098504

Claim:
A converter station for connecting an AC system to an end of an HVDC transmission line, said station comprising: at least two converters arranged in separate converter valve halls and each having a DC-side for connection to the same end of said HVDC transmission line and an AC-side connected to said AC system, a control arrangement adapted to control the operation of said converters, said control arrangement comprises a separate control device for the control of each converter of the converter station, auxiliary power supplies configured to provide the converters with auxiliary power, wherein one of the auxiliary power supplies is provided for each converter, and an overall control configured to control an overall operation conditions of the converters, wherein a separate overall control is configured to control the overall operation conditions of each converter making each converter self supporting, wherein said converter valve halls are separated by a substantial space therebetween with each said control device and overall control arranged in connection with the respective hall.