AU2021101708A4 - System and method for mitigating power quality issue of electric arc furnace - Google Patents
System and method for mitigating power quality issue of electric arc furnace Download PDFInfo
- Publication number
- AU2021101708A4 AU2021101708A4 AU2021101708A AU2021101708A AU2021101708A4 AU 2021101708 A4 AU2021101708 A4 AU 2021101708A4 AU 2021101708 A AU2021101708 A AU 2021101708A AU 2021101708 A AU2021101708 A AU 2021101708A AU 2021101708 A4 AU2021101708 A4 AU 2021101708A4
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- AU
- Australia
- Prior art keywords
- electric arc
- arc furnace
- furnace
- voltage
- transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/144—Power supplies specially adapted for heating by electric discharge; Automatic control of power, e.g. by positioning of electrodes
- H05B7/148—Automatic control of power
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
- F27B3/085—Arc furnaces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
Abstract
The present invention provides a system and method configured for mitigating power quality
issues of an electric arc furnace and remote diagnosis of power quality issues associated with the
electric arc furnace through an IOT communication module. The electric arc furnace comprises a
dynamic voltage restorer (DVR) configured to mitigate the power quality issues of the electric arc
furnace. The IOT communication module enables the detection of fault signals for the spontaneous
arc length variance and the present variation of the arc length.
2/2
200
Electrical Supply | Vacuum Circuit Furnace Electric Arc
202 - Breaker -kTransformer With -b Furnace
204 Reactor 206 208
4IF
From Supervisory Hydraulic Electrode Voltage
Level Position Control Transformer
214 System 212 210
IOT Communication
Module
216
FIG. 2
Description
2/2
200
4IF Electrical Supply | Vacuum Circuit Furnace Electric Arc 202 - Breaker -kTransformer With -b Furnace 204 Reactor 206 208
From Supervisory Hydraulic Electrode Voltage Level Position Control Transformer 214 System 212 210
IOT Communication Module 216
FIG. 2
[0001] The present disclosure relates to mitigating power quality issues of an electric arc furnace and in particular to remote monitoring of power quality issues associated with the electric arc furnace through an IOT communication module.
[0002] An electric arc furnace is a device in which charged material may be heated using an electric arc. Electric arc furnaces are used in a variety of applications in a wide range of scales, from a few dozen grams to hundreds of tons. One application for electric arc furnaces is steelmaking.
[0003] In the steelmaking application, variations in the load experienced by the power grid that supplies electricity to the electric arc furnace give rise to something called "power grid flicker." Unfortunately, power grid flicker can be shown to cause a malfunction in sensitive lighting. Furthermore, power grid flicker can be shown to disturb other consumers on the same power grid. A mitigation method that is currently used in the power grid is at the will of an electric consumer or utility company.
[0004] Further, in an electric arc furnace, a large amount of non-linear loads leads to many power quality problems such as voltage flicker, harmonics, inter harmonics, fluctuation, frequent floats, three-phase imbalance, harmonic wave, etc. This results in the failure of electrical equipment connected at a user end due to the disturbance in voltage, current, or frequency deviation. Custom power devices (CPDs) are used to tackle these power quality problems. However, these custom power devices (CPDs) incur extra cost, and complicated topology and control.
[0005] Therefore, there is a need for smart diagnosis and mitigation of power quality issues related to electric arc furnaces to reduce the manual burden and malfunctioning of the electrical equipment.
[0006] An object of the present invention is to use a dynamic voltage restorer (DVR) in an electric arc furnace to mitigate the power quality issues of the electric arc furnace. The power quality issues are voltage flicker, voltage sag, voltage swell, transients, voltage unbalance, harmonics, and inter harmonics.
[0007] The present invention provides a system and method configured for mitigating power quality issues of an electric arc furnace and remote diagnosis of power quality issues associated with the electric arc furnace through an IOT communication module.
[0008] A self-mitigating electric arc furnace system, characterizing in that a vacuum circuit breaker coupled to a furnace transformer, wherein the furnace transformer is serially connected with a reactor. The reactor is configured to operate with an on-load tap charger (OLTC). The furnace transformer is coupled to an electric arc furnace. The electric arc furnace comprises a dynamic voltage restorer coupled serially and directly in between the furnace transformer and a voltage transformer. The dynamic voltage restorer is configured to mitigate one or more power quality issues of the electric arc furnace. The voltage transformer is coupled in between the electric arc furnace and a hydraulic electrode position control system. Further, self-mitigating electric arc furnace system comprises one or more sensors configured to determine fault signals for a spontaneous arc length variance and a present variation of the arc length through an IOT communication module.
[0009] In one embodiment, the one or more sensors are configured to determine an arc ignition, amount of current flow. The self-mitigating electric arc furnace system is configured to control signal correction in response to variations in the furnace transformer's primary winding voltage.
[0010] The above and other aspects, feature, and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
[0011] FIG. 1 is a circuit diagram illustrating a self-mitigation electric arc furnace, in accordance with an exemplary embodiment of the present invention.
[0012] FIG. 2 is a block diagram illustrating a self-mitigating electric arc furnace system, in accordance with a preferred embodiment of the present invention.
[0013] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0014] The invention may, however, be embodied in many different forms and should not be constructed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the same reference numerals will be used throughout to designate the same or like components.
[0015] An object of the present invention is to use a dynamic voltage restorer (DVR) in an electric arc furnace to mitigate the power quality issues of the electric arc furnace.
[0016] In one exemplary embodiment, the present invention provides a method configured for mitigating power quality issues of an electric arc furnace and remote diagnosis of power quality issues associated with the electric arc furnace through an IOT communication module.
[0017] FIG. 1 is a circuit diagram illustrating a self-mitigation electric arc furnace (100), in accordance with an exemplary embodiment of the present invention. An electric power supply (AC) (102) is supplied to an injection transformer (104). RTis an injection transformer resistance andXTis an injection transformer reactance. RL/2is a resistance of flexible cable and electrodes of an electric arc furnace. XL/2 is an inductance of flexible cable and electrodes of an electric arc furnace. Further, RARCisa variable arc resistance. The injection transformer (104) having a passive filter (106), wherein the passive filter (106) is coupled to a voltage source inverter (VSI) (110). The voltage source inverter (VSI) (110) is used for voltage flicker compensation. The voltage source inverter (VSI) (110) is coupled in between a DC energy storage system (112) and a control system (108). The DC energy storage system (112) is configured to store excess power/energy. Further, to apply a controlled converter control algorithm, the control system (108) is coupled with an electric arc furnace for electrode location regulation.
[0018] FIG. 2 is a block diagram illustrating a self-mitigating electric arc furnace system (200), in accordance with a preferred embodiment of the present invention. The self-mitigating electric arc furnace system (200) comprises a vacuum circuit breaker (204) coupled to a furnace transformer (206). The vacuum circuit breaker (204) is configured to receive an electric power supply (202). The furnace transformer (206) is serially connected with a reactor that is configured to operate with an on-load tap charger (OLTC). Further, the furnace transformer (206) is coupled to an electric arc furnace (208). The electric arc furnace (208) comprises a dynamic voltage restorer coupled serially and directly in between the furnace transformer (206) and a voltage transformer (210). The dynamic voltage restorer (DVR) is configured to mitigate one or more power quality issues of the electric arc furnace (208). The power quality issues are voltage flicker, voltage sag, voltage swell, transients, voltage unbalance, harmonics, and inter-harmonics. The voltage transformer (210) is coupled in between the electric arc furnace (208) and a hydraulic electrode position control system (212). The hydraulic electrode position control system (212) is coupled with a supervisory system (214). Further, the self-mitigating electric arc furnace system (200) comprises an IOT communication module (216) enables determination of faults signals for a spontaneous arc length variance and a present variation of the arc length using one or more sensors. The IOT communication module (216) enables tracking of real-time power/energy usage by an electric load, and an amount of power/energy produced by the electric arc furnace.
[0019] In one embodiment, the self-mitigating electric arc furnace system comprises one or more sensors configured to determine an arc ignition, amount of current flow. The self-mitigating electric arc furnace system is configured to control signal correction in response to variations in the furnace transformer's primary winding voltage.
[0020] In one exemplary embodiment, the self-mitigation electric arc furnace system is configured to minimize electricity losses, short circuits, arc interruptions, and arc current fluctuations. Further, the system enables flexible regulation of one or more electrical conditions at various smelting phases to determine the optimum arc strength.
[0021] Numerous modifications and adaptations of the system and method of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the true spirit and scope of this invention.
Claims (4)
1. A self-mitigating electric arc furnace system, characterizing in that:
a vacuum circuit breaker coupled to a furnace transformer, wherein the furnace transformer serially connected with a reactor, configured to operate with an onload tap charger (OLTC);
wherein the furnace transformer coupled to an electric arc furnace;
wherein the electric arc furnace comprises a dynamic voltage restorer coupled serially and directly in between the furnace transformer and a voltage transformer, the dynamic voltage restorer configured to mitigate one or more power quality issues of the electric arc furnace;
wherein the voltage transformer is coupled in between the electric arc furnace and a hydraulic electrode position control system; and
one or more sensors configured to determine faults signals for a spontaneous arc length variance and a present variation of the arc length through an IOT communication module.
2. The self-mitigating electric arc furnace system as claimed in claim 1, wherein the one or more power quality issues is selected from the group consisting of a voltage flicker, voltage sag, voltage swell, transients, voltage unbalance, harmonics, and inter-harmonics.
3. The self-mitigating electric arc furnace system as claimed in claim 1, wherein the vacuum circuit breaker is configured to receive an electrical power supply.
4. The self-mitigating electric arc furnace system as claimed in claim 1, wherein the one or more sensors are configured to determine an arc ignition and amount of current flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021101708A AU2021101708A4 (en) | 2021-04-02 | 2021-04-02 | System and method for mitigating power quality issue of electric arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021101708A AU2021101708A4 (en) | 2021-04-02 | 2021-04-02 | System and method for mitigating power quality issue of electric arc furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021101708A4 true AU2021101708A4 (en) | 2021-06-10 |
Family
ID=76215476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021101708A Ceased AU2021101708A4 (en) | 2021-04-02 | 2021-04-02 | System and method for mitigating power quality issue of electric arc furnace |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2021101708A4 (en) |
-
2021
- 2021-04-02 AU AU2021101708A patent/AU2021101708A4/en not_active Ceased
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |