CN104674033A - Direct-current electric-arc furnace ferro-nickel smelting and rectifying device and control method thereof - Google Patents
Direct-current electric-arc furnace ferro-nickel smelting and rectifying device and control method thereof Download PDFInfo
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- CN104674033A CN104674033A CN201510122366.0A CN201510122366A CN104674033A CN 104674033 A CN104674033 A CN 104674033A CN 201510122366 A CN201510122366 A CN 201510122366A CN 104674033 A CN104674033 A CN 104674033A
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Abstract
The invention discloses a direct-current electric-arc furnace ferro-nickel smelting and rectifying device and a control method thereof, and belongs to the related technical field of direct-current electric-arc furnace ferro-nickel smelting. An internal temperature sensor of a direct-current electric-arc furnace, a Zigbee low-power wireless transmission module, an optical coupler, a high-power thyristor rectifier bridge, a digital controller and an alternating-current voltage and current sensor are arranged. Monitored data are analyzed and processed through the digital controller; on/off of the thyristor is controlled through a photoelectric coupler; the technical problems of time and labor consumption and poor stability performance in the prior art are solved; the cost can be reduced; the rectification efficiency is improved; and meanwhile, the reliability of the device is enhanced.
Description
Technical field
The present invention relates to a kind of direct current electric arc furnace nickel-iron smelting rectifying device and control method thereof, belong to direct current electric arc furnace nickel-iron smelting correlative technology field.
Background technology
At the three-phase ac electric arc furnace of nickel-iron smelting application, its power is at more than 5000KVA, electric current is at more than 15000A, the harmonic wave that so huge electric current carries can cause huge impact to electrical network, and the current amplitude flowing through three-phase electrode in the middle of smelting process is unstable, need the height constantly regulating electrode, when reality uses, need the height consuming a large amount of time and the adjustment electrode that needs user different, use time-consuming.Huge Current on Grid cause huge impact and in flow through three-phase electrode current amplitude instability determine such device operationally stability be poor.
Summary of the invention
In order to solve the problems of the technologies described above, patent of the present invention provides a kind of direct current electric arc furnace nickel-iron smelting rectifying device and control method thereof, be provided with direct current electric arc furnace in-furnace temperature sensor, Zigbee low-consumption wireless transport module, opticcoupler, high-power thyristor rectifier bridge, digitial controller, AC voltage sensor, AC current sensor, by digitial controller to the data analysis monitored and process, controlled the break-make of thyristor by photoelectrical coupler, solve the technical problem with stability difference that takes time and effort existed in prior art.
To achieve these goals, the technical solution used in the present invention is: a kind of direct current electric arc furnace nickel-iron smelting rectifying device, it is characterized in that: temperature sensor is arranged on electric arc furnace and the in-furnace temperature detected is transferred to zigbee data acquisition transport module I, the data output end of zigbee data acquisition transport module I is connected with digitial controller, thyristor rectifier bridge is connected on electric arc furnace, thyristor rectifier bridge is connected with measure voltage & current module, the data detected are transferred on digitial controller by zigbee data acquisition transport module I by measure voltage & current module, photoelectrical coupler I is connected with at the signal output part of digitial controller, the opposite side of photoelectrical coupler I is connected on thyristor rectifier bridge, the secondary side of three-phase high-voltage transformer is connected on thyristor rectifier bridge, and primary side is connected with three-phase alternating current bus, and three-phase alternating current bus is parallel with filter unit, and the side of photoelectrical coupler II is connected with filter unit, and opposite side is connected with digitial controller.
Described filter unit is composed in parallel by some groups of filtering circuits, often organizes filtered electrical routing resistance, electric capacity and Thyristors in series composition.
Described filtering circuit is provided with fusible cut-out.
Described thyristor rectifier bridge is composed in parallel by the thyristor that three groups are connected between two.
A control method for direct current electric arc furnace nickel-iron smelting rectifying device, is characterized in that:
1), the in-furnace temperature of electric arc furnace and voltage, the current data of thyristor rectifier bridge is detected:
1a), utilize temperature sensor to obtain in-furnace temperature, in-furnace temperature is sent to digitial controller by zigbee data acquisition transport module I;
1b), utilize measure voltage & current module to obtain voltage, the current data of thyristor rectifier bridge, be transferred to digitial controller by zigbee data acquisition transport module I;
2), by digitial controller, analysis is compared to the temperature detected and voltage, current data:
2a), with design temperature and design voltage for benchmark value, the real time temperature detected is converted into real-time voltage, real-time voltage and design voltage are compared, if consistent, directly perform step 3); If inconsistent, calculate the real-time voltage difference between real-time voltage and design voltage, the alternating voltage peak that real-time voltage difference and measure voltage & current module detect is brought in space voltage vector control PWM algorithm, calculates new rectifier bridge switching time;
2b), new rectifier bridge switching time value is applied on photoelectrical coupler I by digitial controller, is controlled on off state and the break-make moment of thyristor in thyristor rectifier bridge by photoelectrical coupler I;
3), total harmonic content of measure voltage & current module being obtained of digitial controller and each harmonic ratio compare calculating, if the ratio of the harmonic wave under a frequency in total harmonic content is less than 2%, then the filtering parallel branch of this frequency disconnects, digitial controller exports low and high level signal to photoelectrical coupler II, is controlled the break-make of thyristor in filtering circuit by photoelectrical coupler II.
The filtering circuit of each group of parallel connection in filter unit is used for filtering 6k ± 1 (k=1,2,3) subharmonic, adds fusible cut-out as overcurrent protection in filtering circuit.
The beneficial effect of patent of the present invention is: patent of the present invention adopts said structure, be provided with direct current electric arc furnace in-furnace temperature sensor, Zigbee low-consumption wireless transport module, opticcoupler, high-power thyristor rectifier bridge, digitial controller, AC voltage sensor, AC current sensor, by digitial controller to the data analysis monitored and process, controlled the break-make of thyristor by photoelectrical coupler, solve the technical problem with stability difference that takes time and effort existed in prior art.The invention provides a kind of high efficiency novel rectifying device and control method thereof, cost-saving, improve efficiency of rectification, and all there is greater advantage the aspect such as device reliability.
Accompanying drawing explanation
Fig. 1: be schematic circuit diagram of the present invention.
Fig. 2: be control method schema of the present invention.
Embodiment
Below in conjunction with accompanying drawing, patent of the present invention is described in detail.
A kind of direct current electric arc furnace nickel-iron smelting rectifying device as shown in Figure 1, structure is: temperature sensor 2 is arranged on electric arc furnace 1 and the in-furnace temperature detected is transferred to zigbee data acquisition transport module I3, and the data output end of zigbee data acquisition transport module I3 is connected with digitial controller 4; Thyristor rectifier bridge 5 is connected on electric arc furnace 1, thyristor rectifier bridge 5 is connected with measure voltage & current module 6, the data detected are transferred on digitial controller 4 by zigbee data acquisition transport module I7 by measure voltage & current module 6, be connected with photoelectrical coupler I9 at the signal output part of digitial controller 4, the opposite side of photoelectrical coupler I9 is connected on thyristor rectifier bridge 5;
The secondary side of three-phase high-voltage transformer 10 is connected on thyristor rectifier bridge 5, primary side is connected with three-phase alternating current bus, three-phase alternating current bus is parallel with filter unit 11, and the side of photoelectrical coupler II12 is connected with filter unit 11, and opposite side is connected with digitial controller 4.Filter unit 11 is composed in parallel by six groups of filtering circuits, often organizes filtered electrical routing resistance, electric capacity and Thyristors in series composition.Filtering circuit is in series with fusible cut-out 8, plays the effect of overcurrent protection.
Thyristor rectifier bridge 5 is composed in parallel by the thyristor that three groups are connected between two.
A control method for direct current electric arc furnace nickel-iron smelting rectifying device, the steps include:
1), the in-furnace temperature of electric arc furnace 1 and voltage, the current data of thyristor rectifier bridge 5 is detected:
1a), utilize temperature sensor 2 to obtain in-furnace temperature, in-furnace temperature is sent to digitial controller 4 by zigbee data acquisition transport module I3;
1b), utilize measure voltage & current module 6 to obtain voltage, the current data of thyristor rectifier bridge 5, be transferred to digitial controller 4 by zigbee data acquisition transport module I7.
2), by digitial controller 4, analysis is compared to the temperature detected and voltage, current data:
2a), with design temperature and design voltage for benchmark value, the real time temperature detected is converted into real-time voltage, real-time voltage and design voltage are compared, if consistent, directly perform step 3); If inconsistent, calculate the real-time voltage difference between real-time voltage and design voltage, the alternating voltage peak that real-time voltage difference and measure voltage & current module 6 detect is brought in space voltage vector control PWM algorithm, space voltage vector control PWM algorithm is modulation system the most frequently used in three phase rectifier, utilizes program computation preset in digitial controller to obtain new rectifier bridge switching time.In space voltage vector modulation mode, if the upper brachium pontis turn on thyristors of each brachium pontis in three-phase brachium pontis, and lower brachium pontis thyristor turns off as state 1; The upper brachium pontis thyristor of each brachium pontis turns off, and lower brachium pontis turn on thyristors is state 0, then there are 8 on off states (000), (001), (010), (100), (011), (101), (110), (111) in three-phase commutation bridge in width modulation;
2b), new rectifier bridge switching time value is applied on photoelectrical coupler I9 by digitial controller 4, the on off state and the break-make moment that control thyristor in thyristor rectifier bridge 5 by photoelectrical coupler I9, determines the break-make of switch on rectifier bridge.
3), total harmonic content of measure voltage & current module 6 being obtained of digitial controller 4 and each harmonic ratio compare calculating, if the ratio of the harmonic wave under a frequency in total harmonic content is less than 2%, then the filtering parallel branch of this frequency disconnects, digitial controller 4 exports low and high level signal to photoelectrical coupler II12, is controlled the break-make of thyristor in filtering circuit by photoelectrical coupler II12.Controlled the break-make combination of parallel filtering part thyristor by opticcoupler II12, while obtaining better filter effect, decrease the loss of power.Filtering circuit in parallel in filter unit 11 is used for filtering 6k ± 1 (k=1,2,3) subharmonic, adds fusible cut-out 8 as overcurrent protection in filtering circuit.
Claims (6)
1. a direct current electric arc furnace nickel-iron smelting rectifying device, it is characterized in that: temperature sensor (2) is arranged on electric arc furnace (1) and the in-furnace temperature detected is transferred to zigbee data acquisition transport module I(3), zigbee data acquisition transport module I(3) data output end on be connected with digitial controller (4), thyristor rectifier bridge (5) is connected on electric arc furnace (1), thyristor rectifier bridge (5) is connected with measure voltage & current module (6), measure voltage & current module (6) by the data detected by zigbee data acquisition transport module I(7) be transferred on digitial controller (4), photoelectrical coupler I(9 is connected with) at the signal output part of digitial controller (4), photoelectrical coupler I(9) opposite side be connected on thyristor rectifier bridge (5), the secondary side of three-phase high-voltage transformer (10) is connected on thyristor rectifier bridge (5), primary side is connected with three-phase alternating current bus, three-phase alternating current bus is parallel with filter unit (11), the side of photoelectrical coupler II (12) is connected with filter unit (11), and opposite side is connected with digitial controller (4).
2. a kind of direct current electric arc furnace nickel-iron smelting rectifying device according to claim 1, is characterized in that: described filter unit (11) is composed in parallel by some groups of filtering circuits, often organizes filtered electrical routing resistance, electric capacity and Thyristors in series composition.
3. a kind of direct current electric arc furnace nickel-iron smelting rectifying device according to claim 1, is characterized in that: described filtering circuit is provided with fusible cut-out (8).
4. a kind of direct current electric arc furnace nickel-iron smelting rectifying device according to claim 1, is characterized in that: described thyristor rectifier bridge (5) is composed in parallel by the thyristor that three groups are connected between two.
5. a control method for direct current electric arc furnace nickel-iron smelting rectifying device, is characterized in that:
1) in-furnace temperature of electric arc furnace (1) and voltage, the current data of thyristor rectifier bridge (5), is detected:
1a), temperature sensor (2) is utilized to obtain in-furnace temperature, by in-furnace temperature by zigbee data acquisition transport module I(3) be sent to digitial controller (4);
1b), measure voltage & current module (6) is utilized to obtain voltage, the current data of thyristor rectifier bridge (5), by zigbee data acquisition transport module I(7) be transferred to digitial controller (4);
2), by digitial controller (4), analysis is compared to the temperature detected and voltage, current data:
2a), with design temperature and design voltage for benchmark value, the real time temperature detected is converted into real-time voltage, real-time voltage and design voltage are compared, if consistent, directly perform step 3); If inconsistent, calculate the real-time voltage difference between real-time voltage and design voltage, the alternating voltage peak that real-time voltage difference and measure voltage & current module (6) detect is brought in space voltage vector control PWM algorithm, calculates new rectifier bridge switching time;
2b), by new rectifier bridge switching time value by digitial controller (4) be applied to photoelectrical coupler I(9) on, by photoelectrical coupler I(9) control on off state and the break-make moment of thyristor in thyristor rectifier bridge (5);
3), total harmonic content of measure voltage & current module (6) being obtained of digitial controller (4) and each harmonic ratio compare calculating, if the ratio of the harmonic wave under a frequency in total harmonic content is less than 2%, then the filtering parallel branch of this frequency disconnects, digitial controller (4) exports low and high level signal to photoelectrical coupler II (12), is controlled the break-make of thyristor in filtering circuit by photoelectrical coupler II (12).
6. the control method of a kind of direct current electric arc furnace nickel-iron smelting rectifying device according to claim 5; it is characterized in that: the filtering circuit in filter unit (11) is used for filtering 6k ± 1 (k=1; 2,3) subharmonic, adds fusible cut-out (8) as overcurrent protection in filtering circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510122366.0A CN104674033B (en) | 2015-03-20 | 2015-03-20 | A kind of direct current electric arc furnace nickel-iron smelting fairing and its control method |
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| CN201510122366.0A CN104674033B (en) | 2015-03-20 | 2015-03-20 | A kind of direct current electric arc furnace nickel-iron smelting fairing and its control method |
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| CN104674033A true CN104674033A (en) | 2015-06-03 |
| CN104674033B CN104674033B (en) | 2017-03-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285667A (en) * | 2019-05-13 | 2019-09-27 | 江苏天楹环保能源成套设备有限公司 | A kind of automatic control system and its control method of direct current electric arc furnace |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0611275A (en) * | 1992-06-26 | 1994-01-21 | Toshiba Corp | Dc arc furnace control device |
| CN102214925A (en) * | 2011-06-14 | 2011-10-12 | 徐仲周 | Filtering device of intermediate frequency smelting furnace |
| CN103730962A (en) * | 2014-01-21 | 2014-04-16 | 成都星宇节能技术股份有限公司 | ZigBee compound switch |
-
2015
- 2015-03-20 CN CN201510122366.0A patent/CN104674033B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0611275A (en) * | 1992-06-26 | 1994-01-21 | Toshiba Corp | Dc arc furnace control device |
| CN102214925A (en) * | 2011-06-14 | 2011-10-12 | 徐仲周 | Filtering device of intermediate frequency smelting furnace |
| CN103730962A (en) * | 2014-01-21 | 2014-04-16 | 成都星宇节能技术股份有限公司 | ZigBee compound switch |
Non-Patent Citations (2)
| Title |
|---|
| 关玉龙 等: "《电弧炉炼钢技术》", 31 October 1990, 北京：科学出版社 * |
| 刘会林 等: "《电弧炉短流程炼钢设备与技术》", 31 January 2012 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285667A (en) * | 2019-05-13 | 2019-09-27 | 江苏天楹环保能源成套设备有限公司 | A kind of automatic control system and its control method of direct current electric arc furnace |
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