DIRECT CURRENT POWER TRANSMISSION

摘要

A power transmission for high voltage direct current includes a direct current line and converter stations connected to the direct current line, with alternating current networks each connected to one of the converter stations. Each converter station includes at least two converters connected in parallel and is provided with a current control system to set the total current of the station as well as the current in the individual converters in accordance with a current order. Each station is provided with an arrangement for sensing the current and/or voltage on the d.c. line, which is connected to the current control system of the station and which reduces the current order set in the station in response to sudden interference in current and/or voltage. The station operating as an inverter is provided with an arrangement responsive to the disappearance of the current in one of the inverters of the station to limit the internal direct voltage of the other inverter to approximately zero.