Patent ID: 8305782
Filing Date: 2012-11-06
Classification: H02J,H02M,Y02E

Abstract:
1. A method for providing redundant control of at least one controllable current valve provided in a converter of a high voltage power transmission system, the method comprising: sending a first valve control signal for said at least one controllable valve and an associated first active/standby indicator from a first converter control unit to a first valve control element of a valve control unit, sending a second valve control signal for said at least one controllable valve and an associated second active/standby indicator from a second control element of said valve control unit, wherein an active/standby indicator indicates if a corresponding converter control unit is an active or standby converter control unit and only one active/standby indicator indicates an active converter control unit at a given point in time, such that two active/standby indicators cannot simultaneously indicate an active converter control unit, receiving, with said valve control unit, said active/standby indicators and said first and second valve control signals, selecting, with said valve control unit, a valve control signal to be used for controlling said current valve if the associated active/standby indicator indicates an active converter control unit, wherein the selecting comprises controlling said current valve using said selected valve control signal.