| 摘要 |
A high voltage direct current transmission system has a first and a second converter station coupled to each other via a direct current link, each converter station with a voltage source converter. The first converter station has a first voltage sensing device for sensing its direct voltage, and a voltage controller for control of its direct voltage. The second converter station has an active power controller for control of its active power flow in dependence on a reference value therefor. The voltage controller controls the direct voltage of the first converter station in dependence on only a sensed instantaneous value of the direct voltage and a first voltage reference value therefor, for a voltage control that is independent of the flow of active power through the first converter. The second converter station includes a second voltage device for sensing its direct voltage. The power controller includes a voltage control for control of the direct voltage of the second converter station in dependence on a sensed instantaneous value thereof and a second voltage reference value, the second voltage reference value being formed in dependence on a third voltage reference value and on a voltage reference correction signal formed in dependence on a quantity indicative of the active power flow through the second converter station and the reference value therefor.
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