Power supply system for arc furnace and associated arc furnace and method
AssigneeGE Energy Power Conversion Technology Limited
InventorsZhi ZHOU, Duro BASIC, Alfred PERMUY, Steven MANKEVICH
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Abstract
Provided is a power supply system for arc furnace and a method for controlling the same, and an arc furnace facility having a power supply system, the power supply system includes a power converter, and a polyphase transformer, a first disconnecting means connecting an input of the power converter to a primary circuit of the transformer, and a second disconnecting means connecting an output of the power converter to the primary circuit of the transformer, the power supply system also includes a first isolation switch and a second isolation switch, and a control circuit.
Claims15
A power supply system for arc furnace, the power supply system comprising:
- a power converter comprising an input intended to be connected to a polyphase supply grid and an output, and
- a polyphase transformer comprising a primary circuit and a secondary circuit,
- a first disconnecting means, and
- a second disconnecting means,
- the power supply system further comprises a first isolation switch and a second isolation switch, the first disconnecting means connecting the input of the power converter to a first end of the first isolation switch, the second disconnecting means connecting the output of the power converter to the first end of the first isolation switch, the second end of the first isolation switch being intended to be connected to at least one electrode of the arc furnace, the second isolation switch connecting the first end of the first isolation switch to the primary circuit and the secondary circuit being connected to the second end of the first isolation switch, and
- a control circuit configured to:
- control the power converter to supply the electrode and to stabilize the current and the voltage delivered by the grid to reduce reactions in the grid when the first disconnecting means are open, the second disconnecting means are closed, the first isolation switch is open and the second isolation switch is closed or the first isolation switch is closed and the second isolation switch is open, and
- control the power converter to stabilize the current and the voltage delivered by the grid to reduce reactions in the grid when the first disconnecting means are closed, the second disconnecting means are open, the first isolation switch is open and the second isolation switch is closed.
A method for controlling a power supply system of an arc furnace, the power supply system including:
- a power converter comprising an input connected to a polyphase supply grid (G) and an output, and
- a polyphase transformer comprising a primary circuit and a secondary circuit,
- a first disconnecting means, and
- a second disconnecting means,
- the method comprising:
- controlling the power converter to supply the electrode and to stabilize the current and the voltage delivered by the grid to reduce reactions in the grid when the first disconnecting means are open, the second disconnecting means are closed, a first isolation switch is open and a second isolation switch is closed or the first isolation switch is closed and the second isolation switch is open, and
- controlling the power converter to stabilize the current and the voltage delivered by the grid to reduce reactions in the grid when the first disconnecting means are closed, the second disconnecting means are open, the first isolation switch is open and the second isolation switch is closed,
- wherein the first disconnecting means connecting the input of the power converter to a first end of the first isolation switch, the second disconnecting means connecting the output of the power converter to the first end of the first isolation switch, the second end of the first isolation switch being intended to be connected to at least one electrode of the arc furnace, the second isolation switch connecting the first end of the first isolation switch to the primary circuit and the secondary circuit being connected to the second end of the first isolation switch.
Dependencies are inferred from the claim text.