公开(公告)号：US20030098672A1

公开(公告)日：2003-05-29

申请号：US10032557

申请日：2002-01-02

Applicant: ABB AB

Inventor： Lennart Wernersson

IPC: G05F001/70

CPC classification number: H02J3/1821 ,  H02J3/1864 ,  Y02E40/12 ,  Y02E40/30

Abstract: An industrial load, preferably an electric arc furnace or a plant for rolling of metallic materials, is supplied from a three-phase electric ac network. A device for compensation of the reactive power consumption of the load comprises a first compensation device for controllable consumption of reactive power and a second compensation device for generation of reactive power, both connected to the electric power network in a parallel connection with the load. The first compensation device comprises a thyristor-controlled reactor for each of the phases of the ac network. Control equipment is supplied with measured values of sensed amplitude values for voltages and currents. The control equipment comprises means for forming a voltage mean value as the mean value of the sensed amplitude values of voltage, and means for forming, for each of the thyristor-controlled reactors, an amplitude deviation as a difference of the voltage mean value and the amplitude value associated with the thyristor-controlled reactor, and means for forming, for each of the thyristor-controlled reactors, a separate control order in dependence on the amplitude deviation for the respective thyristor-controlled reactor.

Abstract translation: 工业负载，优选电弧炉或用于轧制金属材料的设备由三相电交流网络提供。 用于补偿负载的无功功率消耗的装置包括用于可控制地消耗无功功率的第一补偿装置和用于产生无功功率的第二补偿装置，两者都与负载并联连接到电力网络。 第一补偿装置包括用于ac网络的每个相的晶闸管控制的反应器。 控制设备提供测量的电压和电流幅度值的值。 控制设备包括用于形成电压平均值作为感测到的电压幅度值的平均值的装置，以及用于为每个可控硅控制电抗器形成作为电压平均值和 与晶闸管控制的反应器相关联的振幅值，以及用于对于每个可控硅控制的反应器，根据相应的晶闸管控制反应器的振幅偏差形成单独的控制顺序的装置。