Patent ID: 6198641
Filing Date: 2001-03-06
Classification: H02J,Y02E

Abstract:
A plant for transmitting electric power between a direct voltage network for High Voltage Direct Current (HVDC) and an alternating voltage network having at least two stations connected therebetween, each station having a line commutated valve including a thyristor rectifying semiconductor component for transmitting electric power between the direct voltage network and the alternating voltage network, said plant including a circuit arrangement located along the direct voltage network for draining electric power from or feeding electric power into the direct voltage network independently of the polarity of said direct voltage network according to the power feeding direction between the different stations of the plant, said circuit arrangement having at least one bidirectional valve including bidirectionally controlled thyristors (BCTs) for conducting current in both directions through said bidirectional valve, and a control unit for controlling the BCTs so that the current direction between the direct voltage network and the bidirectional valve is such that power is fed either from the direct voltage network to the alternating voltage network or in the opposite direction.