Industrial electric heating furnaces – Arc furnace device – Power supply system
Patent
1991-11-07
1992-10-13
Reynolds, Bruce A.
Industrial electric heating furnaces
Arc furnace device
Power supply system
373102, 373104, 373105, 323210, 323219, H05B 7144
Patent
active
051557401
ABSTRACT:
A flicker compensating apparatus for compensating for flickering due to a variation in the reactive power generated from a DC arc furnace connected by an AC/DC converter to an AC power system, comprises: a current detector for detecting a DC current flowing in the DC arc furnace; a controller for determining the phase control angle of a thyristor included in the AC/DC converter in accordance with the difference between the detected DC current and a predetermined reference current; a calculator for calculating reactive power to be generated by the DC arc furnace, from the detected DC current, the determined phase control angle, and a no-load DC voltage; a compensator including a reactive load connected via thyristor to the power system; and a controller for controlling the phase control angle of the thyristor of the compensator in accordance with the calculated reactive power, for controlling a current flowing across the reactive load, and for permitting the compensator to generate such reactive power as to compensate for a variation in the calculated reactive power.
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Brown Boveri Review, vol. 73, No. 8, Aug. 1986, pp. 471-480 article entitled "Effects of Electric Arc Furnaces on Power Systems and Methods of Compensation" by D. Grundberg et al.
Elektrowarme International, vol. 48, No. 3, Aug., 1990, pp. B125-B130; article entitled Limits to Flicker Reduction of Static Var Compensators with Arc Furnaces.
Revue Generale De L'Electricite, No. 2, Feb., 1988, pp. 31-35 article entitled Flicker Reduction Performance of Static Var Compensators with Arc Furnaces.
"Recent improvement in the steel-making arc furnaces and their power supply", Technical Report (Part II). No. 72 (Dec. 16, 1978), The Institute of Electrical Engineers of Japan.
Ao Norio
Mori Kazuhiko
Hoang Tu
NKK Corporation
Reynolds Bruce A.
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