H - Electricity – 05 – B
Patent
H - Electricity
05
B
307/22
H05B 7/144 (2006.01) F27B 3/28 (2006.01) G05F 1/02 (2006.01)
Patent
CA 2028212
Abstract of the Disclosure 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 con- verter 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 a 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 com- pensate for a variation in the calculated reactive power.
Ao Norio
Mori Kazuhiko
Nkk Corporation
Ridout & Maybee Llp
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