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US 6,608,857 B2Granted
Method of controlling the output voltage of a furnace
OwnerManoharan Thamodharan, Albrecht Wolfinventors
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Abstract
A new control method is used to regulate the reactive power consumption of an electric arc furnace. Active and reactive power values are used space vector variables and serve as control parameter of the power source, which consists of a furnace transformer with current controllers and a booster transformer. This method helps maintain constant reactive power consumption, reduce flicker at the point of common coupling and minimize the disturbances in the power system.
Claims5
A method for controlling an output voltage of an electric arc furnace comprising the steps of:
- providing an electric arc furnace having an intermediate circuit transformer including a magnetic decoupled booster transformer and an AC main-driven transformer having a plurality of taps for adjustments of said output voltage;
- providing an intermediate circuit for the arc furnace, the intermediate circuit comprising a current controller and a zero voltage switch;
- adjusting said adjustment of the output voltage with the main driven transformer by tapping said taps;
- and
- tuning the output voltage by varying a firing angle of the AC main-driven transformer.
2 more elements
Dependencies are inferred from the claim text.