Einrichtung zur Flimmerkompensation für einen Gleichstromlichtbogenofen.

摘要

A flicker compensating apparatus for compensating for flickering due to a variation in the reactive power generated from a DC arc furnace (25) connected by an AC/DC converter (23) to an AC power system (21), comprises a current detector (32) for detecting a DC current flowing in the DC arc furnace (25), a controller (33) for determining the phase control angle of a thyristor included in the AC/DC converter (23) in accordance with the difference between the detected DC current and a predetermined reference current, a calculator (41) for calculating reactive power to be generated by the DC arc furnace (25), from the detected DC current, the determined phase control angle, and a no-load DC voltage, a compensator (46) including a reactive load (45) connected via a thyristor (44) to the power system (21), and a controller (42) for controlling the phase control angle of the thyristor (44) of the compensator (46) in accordance with the calculated reactive power, for controlling a current flowing across the reactive load (45), and for permitting the compensator (46) to generate such reactive power as to compensate for a variation in the calculated reactive power.