| 摘要 |
A device for control of a capacitor device for a shunt-connected static compensator unit (COM1, COM2, COM3) for compensation of reactive power in an electric power network (NW). The capacitor device comprises a capacitor and a semiconductor valve, connected in series with said capacitor, with a first semiconductor, corresponding to respectively a first and a second conduction direction for current through the capacitor. The device comprises members (VN, FSD, CU) which, in dependence on a voltage (Uab, Ubc, Uca) sensed at the compensator, alternately generate a firing order for the respective semiconductor. In addition thereto, the device comprises members which, for each of the first and second conduction directions, form a deblocking signal, indicating that the conduction direction associated with the respective firing order does not carry current, and which thus generate a firing order for the second of the first and second conduction directions with an optional delay (T1*f*360 DEG ) after the occurrence of said deblocking signal. |
