| 摘要 |
Individually controllable, self-commutated power converters (11, 12, 13) are in each case connected on the AC voltage side between two different phase conductors (1, 2; 2, 3; 1, 3) of a multi-phase AC voltage system, their controllable, automatically resettable valves (A to D) being disposed in a single-phase bridge circuit. A transformer (14, 15, 16) is in each case disposed between the AC voltage-side outputs of the individual power converters (11, 12, 13) and the AC voltage system (4). A DC source (20) feeds a constant direct current (Id) into the power converters interconnected in series on the DC side. The amplitude, and also the phase angle referred to the AC voltage system, of the fundamental oscillation of the output current (ix, iy, ix) of each individual power converter (11, 12, 13) can be set via its own control device (31, 32, 33). This achieves a high adjustment speed in compensating for the reactive power and/or in balancing the unbalance changes of a consumer (6) connected to the AC voltage system. <IMAGE>
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