Power converter device for direct current power supply to an ele

Details Power converter device for direct current power supply to an ele Power converter device for direct current power supply to an ele

1994-04-26

1995-10-31

Reynolds, Bruce A.

Industrial electric heating furnaces

Arc furnace device

Power supply system

373102, 363 70, H05B 7144

Patent

active

054636531

ABSTRACT:
A power converter device for supplying direct current to an electric arc furnace comprises at least one transformer with its primary fed with a three-phase alternating current and delivering to at least one secondary a three-phase current applied to a rectifier system outputting to the load a rectified voltage and current. The rectifier system comprises controlled semiconductors for each secondary and a freewheel circuit. The controlled semiconductors are triggered with essentially variable firing angles, modified to increase the duration of conduction in the freewheel circuit whilst reducing the duration of conduction in the triggered semiconductors, and vice versa, so as to deliver to the load a substantially constant active power or reactive power despite variations in the impedance of the load.

REFERENCES:
patent: 4021721 (1977-05-01), Tachibana
patent: 4349605 (1994-09-01), Campbell
patent: 4461010 (1984-07-01), Titus
patent: 4586188 (1986-04-01), Buhler
patent: 4725939 (1988-02-01), Boisdon
patent: 4857821 (1989-08-01), Takeda
W. Spatny et al, "Power Supplies for DC Arc Furnaces", ABB Review, No. 6, 1992, pp. 11-16.
M. Muslu et al, "Voltage Flicker Calculations for a 35 MW DC Electric Arc Furnace Supplied by a 12 Pulse Rectifier", Proceedings of the American Power Conference, No. 52, 1990, pp. 453-457.
French Search Report FR 9305183.

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