| 摘要 |
A device for compensation of the reactive power consumption of an industrial load (2), preferably an electric arc furnace or a plant for rolling of metallic materials, supplied from a three-phase (a, b, c) electric ac network (1), comprises a first compensation device (3) for controllable consumption of reactive power and a second compensation device (4) for generation of reactive power. The first compensation device comprises an inductor (31) connected in series with a semiconductor connection (32) controllable in dependence on a control order ( alpha ref) supplied thereto. Control equipment (7) is supplied with measured values of voltage (Ua, Ub, Uc) and current (Ia, Ib, Ic), respectively, at the load. The control equipment comprises means (8) for determination of the instantaneous consumption of active (P(t)) and of reactive power (Q(t)) by the load, and a control device (9) which forms the control order to the first compensation device in dependence on the consumption of reactive power and active power by the load.
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