Industrial electric heating furnaces – Arc furnace device – Power supply system
Patent
1995-10-06
1997-04-01
Hoang, Tu B.
Industrial electric heating furnaces
Arc furnace device
Power supply system
373102, 323211, H05B 7144
Patent
active
056174470
ABSTRACT:
When operating, DC arc furnaces generate undesired reactive load fluctuations which are compensated without special compensation reactance by a reactive power controller. As compensation reactance, use is made of inductors, which are always present and via which the arc furnace is fed by rectifiers. A current controller is connected to the rectifiers via a first summer. On the input side, the first summer is further operationally connected to the output of the reactive power controller and, as the case may be, to an AC--AC converter which supplies a signal proportional to the power supply voltage (U.sub.xN). In addition, it is possible to provide an inverter which is connected in parallel with the arc furnace on the DC side and which is operationally connected on the AC side to a feeding AC power supply network (N) via a stabilization transformer or via auxiliary windings of a furnace transformer, and to the output of the reactive power controller on the control side. On the output side, the reactive power controller can further be operationally connected to the current controller via a second summer.
REFERENCES:
patent: 4698581 (1987-10-01), Shimamura et al.
patent: 5155740 (1992-10-01), Ao et al.
patent: 5351267 (1994-09-01), Strebel
patent: 5463653 (1995-10-01), Du Parc et al.
"Transient AC/DC Simulator and Field Tests of the Closed Loop Control of the Pelham SVCS'" Welsh et al., Fifth European Conference on Power Electronics and Applications, Bd. 8, 13.--Sep. 16, 1993 Brighton Conference Center.
ABB Management AG
Hoang Tu B.
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