Claims
- 1. 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. The method of claim 1 wherein the method further comprises the step of:maintaining an active power constant.
- 3. The method of claim 1 wherein the method further comprises the step of:maintaining a reactive power constant.
- 4. The method of claim 1 wherein the method further comprises the steps of:maintaining an active power constant; and maintaining a reactive power constant.
- 5. The method of claim 1 further comprising the steps of:analyzing at least one of a reactive power and an effective power as space vector variables; and utilizing one of the space vector variables as parameters for at least tuning the AC main-driven transformer.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a divisional of patent application Ser. No. 09/419,654 filed Oct. 18, 1999, now U.S. Pat. No. 6,226,313
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