Flicker compensating apparatus for DC arc furnace

Industrial electric heating furnaces – Arc furnace device – Power supply system

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Details

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.

REFERENCES:
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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.

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