| 摘要 |
A direct current power transmission system includes a first and a second converter station that are coupled to each other via a direct current link. Each converter station includes a first or second line commutated converter, respectively. Before power reversal the first converter is operated as a rectifier and the direct current is controlled in the first station, while the second converter is operated as an inverter and in the second station the extinction angle of the second converter or the direct voltage is controlled. After power reversal, the first converter is operated as an inverter and the second converter as a rectifier. During power reversal a change is carried out in the first station from control of the direct current to control of the extinction angle of the first converter or to control of the direct voltage, which is performed in synchronization with a change in the second station from control of the extinction angle of the second converter or from control of the direct voltage to control of the direct current.
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