Method and device for compensation of reactive power

Details Method and device for compensation of reactive power Method and device for compensation of reactive power

1997-06-12

2000-09-05

Nguyen, Matthew

Electricity: power supply or regulation systems

For reactive power control

Using impedance

323207, G05F 170

Patent

active

061148415

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

REFERENCES:
patent: 4174497 (1979-11-01), Depenbrock
patent: 4780660 (1988-10-01), Shima et al.
patent: 5138247 (1992-08-01), Tanoue et al.
patent: 5321598 (1994-06-01), Moran
patent: 5734256 (1998-03-01), Larsen et al.

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