CN104674033B - A kind of direct current electric arc furnace nickel-iron smelting fairing and its control method - Google Patents
A kind of direct current electric arc furnace nickel-iron smelting fairing and its control method Download PDFInfo
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- CN104674033B CN104674033B CN201510122366.0A CN201510122366A CN104674033B CN 104674033 B CN104674033 B CN 104674033B CN 201510122366 A CN201510122366 A CN 201510122366A CN 104674033 B CN104674033 B CN 104674033B
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Abstract
A kind of direct current electric arc furnace nickel-iron smelting fairing and its control method, belong to direct current electric arc furnace nickel-iron smelting correlative technology field.The present invention is provided with direct current electric arc furnace in-furnace temperature sensor, Zigbee low-consumption wireless transport module, photo-coupler, high-power thyristor rectifier bridge, digitial controller and alternating voltage current sensor, by digitial controller, the data monitoring is analyzed and processes, control the break-make of IGCT by photoelectrical coupler, solve and present in prior art, take time and effort the technical problem poor with stability.The present invention can be cost-effective, improves rectification efficiency, enhances the reliability of device simultaneously.
Description
Technical field
The present invention relates to a kind of direct current electric arc furnace nickel-iron smelting fairing and its control method, belong to direct current electric arc furnace nickel
Correlative technology field smelted by ferrum.
Background technology
Nickel-iron smelting application three-phase ac electric arc furnace, its power in more than 5000KVA, electric current in more than 15000A,
The harmonic wave that so huge electric current carries can cause huge impact to electrical network, and flows through three-phase electrode in the middle of smelting process
Current amplitude is unstable, needs the height of constantly regulate electrode, when actually used, need to consume the substantial amounts of time and needs
The height of the different regulation electrode of user, uses time-consuming.Huge Current on Grid cause huge impact and
In flow through the current amplitude of three-phase electrode and unstable determine such device operationally stability is poor.
Content of the invention
In order to solve above-mentioned technical problem, patent of the present invention provide a kind of direct current electric arc furnace nickel-iron smelting fairing and
Its control method, is provided with direct current electric arc furnace in-furnace temperature sensor, Zigbee low-consumption wireless transport module, photo-coupler,
High-power thyristor rectifier bridge, digitial controller, AC voltage sensor, AC current sensor, by digitial controller pair
The data monitoring is analyzed and processes, and controls the break-make of IGCT by photoelectrical coupler, solves in prior art and deposit
Take time and effort the technical problem poor with stability.
To achieve these goals, the technical solution used in the present invention is：A kind of direct current electric arc furnace nickel-iron smelting rectification dress
Put it is characterised in that：Temperature sensor is arranged on, on electric arc furnace, the in-furnace temperature detecting is transferred to zigbee wireless data
Collection transport module I, the data output end of zigbee data acquisition transport module I is connected with digitial controller, brilliant lock
Pipe rectifier bridge is connected on electric arc furnace, is connected with measure voltage ＆amp, measure voltage ＆ current mould on thyristor rectifier bridge
The data detecting is transferred on digitial controller by block by zigbee data acquisition transport module I, digital control
The signal output part of device is connected with photoelectrical coupler I, and the opposite side of photoelectrical coupler I is connected on thyristor rectifier bridge；Three-phase
The secondary side of high-tension transformer is connected on thyristor rectifier bridge, and primary side is connected with three-phase alternating current bus, female in three-phase alternating current
Filter unit is parallel with line, 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 filter circuits, every group of filtered electrical routing resistance, electric capacity and brilliant lock
Pipe is composed in series.
It is provided with fuse on described filter circuit.
Described thyristor rectifier bridge is composed in parallel by three groups of IGCTs connected two-by-two.
A kind of control method of direct current electric arc furnace nickel-iron smelting fairing it is characterised in that：
1）, the voltage of the detection in-furnace temperature of electric arc furnace and thyristor rectifier bridge, current data：
1a）, obtain in-furnace temperature using temperature sensor, by in-furnace temperature by zigbee data acquisition transmit mould
Block I is sent to digitial controller；
1b）, obtain thyristor rectifier bridge using measure voltage ＆amp voltage, current data, by zigbee no
Line data acquisition transport module I is transferred to digitial controller；
2）, analysis is compared to the temperature detecting and voltage, current data by digitial controller：
2a）, on the basis of design temperature and design voltage be worth, the real time temperature detecting is converted into real-time voltage, will
Real-time voltage is compared with design voltage, if consistent, directly execution step 3）；If inconsistent, calculate real-time voltage and design
Real-time voltage difference between voltage, the alternating voltage peak band that real-time voltage difference and measure voltage ＆amp are detected
Enter in space voltage vector control PWM algorithm, be calculated new rectifier bridge switching time；
2b), new rectifier bridge switching time value is applied on photoelectrical coupler I by digitial controller, by photoelectricity
Bonder I controls the on off operating mode of IGCT and break-make moment in thyristor rectifier bridge；
3）, digitial controller total harmonic content that measure voltage ＆amp is obtained and each harmonic ratio be compared meter
Calculate, if ratio in total harmonic content for the harmonic wave under a frequency is less than 2%, the filtering parallel branch of this frequency disconnects, numeral
Controller exports low and high level signal to photoelectrical coupler II, controls the logical of IGCT in filter circuit by photoelectrical coupler II
Disconnected.
Each group in filter unit filter circuit in parallel is used for filtering 6k ± 1 (k=1,2,3) subharmonic, in filter circuit
Middle addition fuse is as overcurrent protection.
The having the beneficial effects that of patent of the present invention：Patent of the present invention adopts said structure, is provided with direct current electric arc furnace stove
Temperature sensor, Zigbee low-consumption wireless transport module, photo-coupler, high-power thyristor rectifier bridge, digitial controller, hand over
Stream voltage sensor, AC current sensor, by digitial controller, the data monitoring is analyzed and processes, by light
Electric coupler controls the break-make of IGCT, solves and takes time and effort the technology poor with stability present in prior art and ask
Topic.The invention provides a kind of efficient novel rectifying device and its control method, in cost-effective, raising rectification efficiency,
And the aspect such as device reliability all has greater advantage.
Brief description
Fig. 1：Circuit theory diagrams for the present invention.
Fig. 2：Control method flow chart for the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings patent of the present invention is described in detail.
A kind of direct current electric arc furnace nickel-iron smelting fairing as shown in Figure 1, structure is：Temperature sensor 2 is arranged on electricity
On arc stove 1, the in-furnace temperature detecting is transferred to zigbee data acquisition transport module I3, zigbee wireless data is adopted
It is connected with digitial controller 4 on the data output end of collection transport module I3；Thyristor rectifier bridge 5 is connected on electric arc furnace 1, in crystalline substance
Measure voltage ＆amp 6 is connected with brake tube rectifier bridge 5, the data detecting is passed through by measure voltage ＆amp 6
Zigbee data acquisition transport module I7 is transferred on digitial controller 4, connects in the signal output part of digitial controller 4
There is photoelectrical coupler I9, the opposite side of photoelectrical coupler I9 is connected on thyristor rectifier bridge 5；
The secondary side of three-phase high-voltage transformator 10 is connected on thyristor rectifier bridge 5, primary side and three-phase alternating current bus phase
Even, filter unit 11 is parallel with three-phase alternating current bus, the side of photoelectrical coupler II12 is connected with filter unit 11, another
Side is connected with digitial controller 4.Filter unit 11 is composed in parallel by six groups of filter circuits, every group of filtered electrical routing resistance, electric capacity
With Thyristors in series composition.Fuse 8 is in series with filter circuit, plays the effect of overcurrent protection.
Thyristor rectifier bridge 5 is composed in parallel by three groups of IGCTs connected two-by-two.
A kind of control method of direct current electric arc furnace nickel-iron smelting fairing, its step is：
1）, the voltage of the detection in-furnace temperature of electric arc furnace 1 and thyristor rectifier bridge 5, current data：
1a）, obtain in-furnace temperature using temperature sensor 2, in-furnace temperature is transmitted by zigbee data acquisition
Module I 3 is sent to digitial controller 4；
1b）, obtain voltage, the current data of thyristor rectifier bridge 5 using measure voltage ＆amp 6, by zigbee
Data acquisition transport module I7 is transferred to digitial controller 4.
2）, analysis is compared to the temperature detecting and voltage, current data by digitial controller 4：
2a）, on the basis of design temperature and design voltage be worth, the real time temperature detecting is converted into real-time voltage, will
Real-time voltage is compared with design voltage, if consistent, directly execution step 3）；If inconsistent, calculate real-time voltage and design
Real-time voltage difference between voltage, the alternating voltage peak that real-time voltage difference is detected with measure voltage ＆amp 6
It is brought in space voltage vector control PWM algorithm, space voltage vector control PWM algorithm is the most frequently used tune in three phase rectifier
Mode processed, is calculated new rectifier bridge switching time using preset program in digitial controller.Adjust in space voltage vector
In mode processed, if the upper brachium pontis turn on thyristors of each of three-phase brachium pontis brachium pontis, and lower brachium pontis IGCT turns off as state
1；The upper brachium pontis IGCT of each brachium pontis turns off, and lower brachium pontis turn on thyristors is state 0, then three-phase commutation bridge is adjusted in pulsewidth
There are 8 on off states in system（000）、（001）、（010）、（100）、（011）、（101）、（110）、（111）；
2b), new rectifier bridge switching time value is applied on photoelectrical coupler I9 by digitial controller 4, by light
Electric coupler I9 controls the on off operating mode of IGCT and break-make moment in thyristor rectifier bridge 5, determines that switch on rectifier bridge leads to
Disconnected.
3）, digitial controller 4 total harmonic content of obtaining measure voltage ＆amp 6 and each harmonic ratio be compared
Calculate, if ratio in total harmonic content for the harmonic wave under a frequency is less than 2%, the filtering parallel branch of this frequency disconnects, number
Word controller 4 exports low and high level signal to photoelectrical coupler II12, is controlled brilliant in filter circuit by photoelectrical coupler II12
The break-make of brake tube.Control the break-make combination of parallel filtering part IGCT by photo-coupler II12, preferably filtered effect
The loss of power is decreased while fruit.In filter unit 11, filter circuit in parallel is secondary humorous for filtering 6k ± 1 (k=1,2,3)
Ripple, adds fuse 8 as overcurrent protection in filter circuit.
Claims (5)
1. a kind of direct current electric arc furnace nickel-iron smelting fairing it is characterised in that：Temperature sensor（2）It is arranged on electric arc furnace（1）
On the in-furnace temperature detecting is transferred to zigbee data acquisition transport module I（3）, zigbee data acquisition biography
Defeated module I（3）Data output end on be connected with digitial controller（4）, thyristor rectifier bridge（5）It is connected to electric arc furnace（1）On,
In thyristor rectifier bridge（5）On be connected with measure voltage ＆amp（6）, measure voltage ＆amp（6）By the number detecting
According to by zigbee data acquisition transport module I（7）It is transferred to digitial controller（4）On, in digitial controller（4）Letter
Number outfan is connected with photoelectrical coupler I（9）, photoelectrical coupler I（9）Opposite side be connected to thyristor rectifier bridge（5）On；Three
Phase high-tension transformer（10）Secondary side be connected to thyristor rectifier bridge（5）On, primary side is connected with three-phase alternating current bus, three
It is parallel with filter unit on cross streams bus（11）, the side of photoelectrical coupler II (12) and filter unit（11）It is connected, another
Side and digitial controller（4）It is connected；Described filter unit（11）Composed in parallel by some groups of filter circuits, every group of filter circuit
It is made up of resistance, electric capacity and Thyristors in series.
2. a kind of direct current electric arc furnace nickel-iron smelting fairing according to claim 1 it is characterised in that：Described filtering
Fuse is provided with circuit（8）.
3. a kind of direct current electric arc furnace nickel-iron smelting fairing according to claim 1 it is characterised in that：Described brilliant lock
Pipe rectifier bridge（5）Composed in parallel by three groups of IGCTs connected two-by-two.
4. a kind of control method of direct current electric arc furnace nickel-iron smelting fairing it is characterised in that：
1）, detection electric arc furnace（1）In-furnace temperature and thyristor rectifier bridge（5）Voltage, current data：
1a）, utilize temperature sensor（2）Obtain in-furnace temperature, in-furnace temperature is transmitted mould by zigbee data acquisition
Block I（3）It is sent to digitial controller（4）；
1b）, utilize measure voltage ＆amp（6）Obtain thyristor rectifier bridge（5）Voltage, current data, by zigbee
Data acquisition transport module I（7）It is transferred to digitial controller（4）；
2）, pass through digitial controller（4）Analysis is compared to the temperature detecting and voltage, current data：
2a）, be worth on the basis of design temperature and design voltage, the real time temperature detecting is converted into real-time voltage, will be in real time
Voltage is compared with design voltage, if consistent, directly execution step 3）；If inconsistent, calculate real-time voltage and design voltage
Between real-time voltage difference, by real-time voltage difference and measure voltage ＆amp（6）The alternating voltage peak band detecting
Enter in space voltage vector control PWM algorithm, be calculated new rectifier bridge switching time；
2b), new rectifier bridge switching time value is passed through digitial controller（4）It is applied to photoelectrical coupler I（9）On, by light
Electric coupler I（9）Control thyristor rectifier bridge（5）The on off operating mode of middle IGCT and break-make moment；
3）, digitial controller（4）By measure voltage ＆amp（6）The total harmonic content obtaining and each harmonic ratio are compared
Calculate, if ratio in total harmonic content for the harmonic wave under a frequency is less than 2%, the filtering parallel branch of this frequency disconnects, number
Word controller（4）Export low and high level signal to photoelectrical coupler II (12), filtered electrical is controlled by photoelectrical coupler II (12)
The break-make of IGCT in road.
5. a kind of direct current electric arc furnace nickel-iron smelting fairing according to claim 4 control method it is characterised in that：
Filter unit（11）In filter circuit be used for filter 6k ± 1 (k=1,2,3) subharmonic, in filter circuit add fuse
（8）As overcurrent protection.
Priority Applications (1)
| 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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| 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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| Publication Number | Publication Date |
|---|---|
| CN104674033A CN104674033A (en) | 2015-06-03 |
| CN104674033B true CN104674033B (en) | 2017-03-08 |
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| CN201510122366.0A Expired - Fee Related 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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| CN110285667B (en) * | 2019-05-13 | 2021-02-02 | 江苏天楹环保能源成套设备有限公司 | Automatic control system and control method of direct current electric arc furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3073606B2 (en) * | 1992-06-26 | 2000-08-07 | 株式会社東芝 | DC arc furnace controller |
| CN102214925B (en) * | 2011-06-14 | 2013-10-02 | 徐仲周 | Filtering device of intermediate frequency smelting furnace |
| CN103730962B (en) * | 2014-01-21 | 2016-10-05 | 成都星宇节能技术股份有限公司 | ZigBee combination switch |
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