CN109286193A - A kind of electric arc furnace low-pressure reactive compensation and filter and its voltage control method - Google Patents
A kind of electric arc furnace low-pressure reactive compensation and filter and its voltage control method Download PDFInfo
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- CN109286193A CN109286193A CN201811295665.4A CN201811295665A CN109286193A CN 109286193 A CN109286193 A CN 109286193A CN 201811295665 A CN201811295665 A CN 201811295665A CN 109286193 A CN109286193 A CN 109286193A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a kind of electric arc furnace low-pressure reactive compensation and filters and its voltage control method, including supply network, high-voltage circuitbreaker, high voltage reactor, electric arc furnaces on-load regulator transformer, the short net of low pressure, flexible-cable, graphite electrode, furnace body and water-cooling system, low-pressure reactive compensation and filtering cabinet, electric furnace controlling platform；The supply network, high-voltage circuitbreaker, high voltage reactor, electric arc furnaces on-load regulator transformer, the short net of low pressure, flexible-cable, graphite electrode, furnace body and water-cooling system are linked in sequence；The low-pressure reactive compensation and filtering cabinet connect in short net end, and internal setting multichannel reactive power compensation circuit and multichannel combine resonant mode filter circuit；The optimization power supply curve voltage exported using electric arc furnaces on-load regulator transformer, control the low-pressure reactive compensation amount of electric arc furnaces, resonant mode filter circuit is combined using the multichannel of interior of equipment cabinet setting, the harmonic frequency of electric arc furnaces production process generation is filtered out, purifies the power utilization environment of supply network.
Description
Technical field
Present invention relates particularly to a kind of electric arc furnace low-pressure reactive compensation and filters and its voltage control method, belong to electricity
Arc furnace produces energy-saving field.
Background technique
Electric arc furnaces is a kind of electric furnace using arc heat metal smelting, belongs to highly energy-consuming production equipment；It is to utilize graphite electrode
The equipment of production steel alloy is smelted with the high-temperature electric arc heat being melt between furnace charge；Product has tool steel, stainless steel, special steel etc.；
Arc furnace steeling process opens arc, melting stage, refining period, six stage compositions of tapping by fettling, charging；Existing electric arc furnaces exists
There is certain deficiencies in use process.
(1) electric arc furnaces low side power factor is relatively low；Inductive feature is presented in on-load regulator transformer, short net, flexible-cable,
Tens of thousands of amperes of electric current generates a large amount of reactive power when passing through transformer, short net, flexible-cable, and low side power factor is only capable of maintaining
0.84 or so, hence it is evident that lower than the regulation of national high voltage supply user power factor 0.90.
Currently, electric arc furnaces majority uses high pressure, middle pressure reactive compensation, although being able to satisfy national high voltage supply power factor
It is required that but because electric arc furnaces reactive loss is concentrated mainly on the low-pressure side of on-load regulator transformer, therefore, enterprise how many does not save
Electric benefit；If reactive current still occupies a large amount of power supplying and distributing equipment capacity, and equipment cannot without effective low-pressure reactive compensation
It makes full use of, enterprise's production capacity also will receive limitation.
(2) for electric arc furnaces in steelmaking process, load current sharply frequently random variation generates non-sinusoidal and asymmetry
Distortion, not only causes voltage fluctuation and flicker, also generates a large amount of harmonic frequency；Especially melt during furnace charge collapse, electrode
Short circuit, phase voltage are uneven, not only generate odd harmonic, but also generate even-order harmonic, cause power utilization environment to pollute in power grid；
It is main to generate 2~7 subfrequencies, including 100Hz, 2 subharmonic, 150Hz, 3 subharmonic, 200Hz, 4 subharmonic, 250Hz, 5
Subharmonic, 300Hz, 6 subharmonic, 350Hz, 7 subfrequencies etc., wherein 2,3,5 subfrequency content highests.
(3) low-pressure reactive compensation of conventionally employed switch on-off capacitor, there is also some technical problems:
(a) selection of low-voltage and high-current switch is difficult, is all inquiring into, is studying novel switched application；
(b) fling-cut switch generates pulse voltage and surge current, is easily damaged reactive-load compensation capacitor；
(c) that there is also failures is more, the service life is short, follow-up maintenance heavy workload is asked for traditional electric arc furnace low-pressure reactive compensation equipment
Topic.
The above problem causes the low-voltage reactive compensator of traditional mode, is unable to satisfy the skill of electric arc furnace low-pressure reactive compensation
Art demand.
Number of patent application is the utility model patent of CN201420792645.9, discloses a kind of idle benefit of ore furnace low-pressure
Device is repaid, a kind of mode of voltage control ore furnace low-pressure reactive compensation amount is provided；However above-mentioned reactive power compensator, to electricity
Arc furnace low-pressure reactive compensation is simultaneously not suitable for, the reason is as follows that.
(1) mineral hot furnace is the characteristic metallurgical equipment using high arc temperature fusing mineral aggregate.Electrode is embedded in furnace charge, and furnace charge is in electricity
Directly reaction generates product at a high temperature of arc heat and resistance heat, and product has calcium carbide, silicon, ferrosilicon, silicomanganese etc.；Mineral hot furnace production is one
The production process of a melting continuously, often the continuous several months produces not blowing out；Electrode voltage presses production technology, selects a fixation
The a small range of value；Electrode voltage variation is small, surge voltage and surge current also very little；Three phase mains balance, only generates 3,5,7
Subfrequency, no even-order harmonic.
(2) electric arc furnaces is to smelt setting for production steel alloy using graphite electrode and the high-temperature electric arc heat being melt between furnace charge
Standby, product has tool steel, stainless steel, special steel etc..Electric arc furnaces is to smelt every furnace molten steel for a production cycle；Electric arc furnaces is negative
Lotus feature is that electric current transient change is very fierce, and the duration is long；Especially collapse in melting stage furnace charge, electric pole short circuit, electricity
Flowing the variation within the time of second grade can be up to as many as hundreds of ampere；Electric current generates the distortion of non-sinusoidal and asymmetry, electric arc furnaces three-phase electricity
The imbalance in source not only generates 3,5,7 subharmonic, also 2,4,6 even harmonics frequencies of generation；It is wanted according to electric arc furnace smelting technique
It asks, sets the electrode voltage in each smelting stage；The lower electrode voltage of arc phase selection is being opened, power-on time is most short；In melting stage
Highest electrode voltage is selected, conduction time is also grown；Refining period electrode voltage is also relatively lower；The confession of electric arc furnaces graphite electrode
Piezoelectric voltage generallys use electric arc furnaces optimization power supply curve to describe.
(3) electric arc furnaces power supply optimization curve is also referred to as electrical force profiles, be description arc furnace smelting procedure in electrode voltage with smelting
Refine the curve of time change；It mainly solves in steelmaking process, electrode voltage and the optimization of the optimization in each smelting process stage
Power-on time parameter, it is therefore an objective to which the smelting of fast pace, low cost goes out every furnace molten steel.
Number of patent application is the utility model patent of CN201420792645.9, the ore furnace low-pressure reactive compensation dress provided
The power supply mode set is not suitable for the power reguirements of electric arc furnaces low-voltage reactive compensator.
Summary of the invention
The purpose of the present invention is to provide a kind of electric arc furnace low-pressure reactive compensation and filters and its voltage control method；
The present invention solves the problems in background technique by the following method: (1) low-pressure reactive compensation is with the antipodal storage of property
Energy element and the element are in parallel on the spot, carry out this charge and discharge process between two energy storage units, shorten reactive current
Path, the key of local compensation are to compensate point of penetration close to load end；By connecing low-pressure reactive compensation and filtering cabinet short
End is netted, local compensation is realized, shortens the path of reactive current, carry out effective low-pressure reactive compensation, and reactive current will not
A large amount of power supplying and distributing equipment capacity are occupied, equipment can make full use of, and improve production capacity；(2) control mode of reactive compensation amount；It is to adopt
Optimization power supply curve voltage is exported with electric arc furnaces on-load regulator transformer, and then regulates and controls electric arc furnace low-pressure reactive compensation and filtering machine
The end voltage of cabinet；Realize electric arc furnace low-pressure reactive compensation amount control, avoid the low pressure of conventionally employed switch on-off capacitor without
Technical problem existing for function compensation way；(3) harmonic frequency filters out, and in process of production, curent change swashs electric arc furnaces very much
It is strong, generate non-sinusoidal and asymmetry distortion and harmonic frequency；Utilize multiway combined type capacitor and reactor series current resonance electricity
Road filters out harmonic frequency, purifies the power utilization environment of electric arc furnaces.
The technical solution adopted by the invention is as follows:
A kind of electric arc furnace low-pressure reactive compensation and filter, including supply network, high-voltage circuitbreaker, high voltage reactor, electric arc
The short net of furnace on-load regulator transformer, low pressure, flexible-cable, graphite electrode, furnace body and water-cooling system, low-pressure reactive compensation and filtering machine
Cabinet, electric furnace controlling platform；It is characterized by: the supply network, high-voltage circuitbreaker, high voltage reactor, electric arc furnaces on-load voltage regulation
The short net of transformer, low pressure, flexible-cable, graphite electrode, furnace body and water-cooling system are linked in sequence；The low-pressure reactive compensation and filtering machine
Cabinet connects in short net end, and internal setting multichannel reactive power compensation circuit and multichannel combine resonant mode filter circuit；Realize idle function
Rate local compensation, meanwhile, electric arc furnace low-pressure reactive compensation and filtering cabinet connect in the end of short net, to electricity at graphite electrode
Net voltage stabilization, reduction voltage flicker, damped oscillation, harmonic carcellation etc. have good effect.
The multichannel combination resonant mode filter circuit includes: the 2 subharmonic filter circuits of 2 road 100Hz, 3 road 150Hz's
5 subharmonic filter circuits of 3 subharmonic filter circuits and 1 road 250Hz, every road harmonic filter circuit are series circuit, including filter
Wave capacitor, filter reactor.
The 2 subharmonic filter circuits of the 2 road 100Hz, including by reactor L1, capacitor C1, air switch K1-1String
Join the 2 subharmonic filter circuit of the first via of composition；By reactor L2, capacitor C2, air switch K1-2The second tunnel being composed in series
2 subharmonic filter circuits；The 5 subharmonic filter circuits of the 1 road 250Hz, by reactor L3, capacitor C3, air switch
K1-3It is composed in series；The 5 subharmonic filtering of 2 subharmonic filter circuit of the first via, 2 subharmonic filter circuit of the second tunnel, 1 road 250Hz
Circuit in parallel, it is whole to connect with fuse RD1；The 3 subharmonic filter circuits of the 3 road 150Hz, including by reactor L4,
Capacitor C4, air switch K2-1The 3 subharmonic filter circuit of the first via being composed in series；By reactor L5, capacitor C5, air
Switch K2-2The 3 subharmonic filter circuit of the second tunnel being composed in series；By reactor L6, capacitor C6, air switch K2-3Series connection group
At 3 subharmonic filter circuit of third road；3 subharmonic filter circuit of the first via, 3 subharmonic filter circuit of the second tunnel, third road 3
Subharmonic filter circuit is in parallel, entirety is connected with fuse RD2.
Multichannel combines resonant mode filter circuit, equally has filter action to order harmonic frequencies；Multichannel combines resonant mode
Filter circuit construction is simple, and tuning is easy, and harmonic frequency filtration result is better than the mode of traditional disharmonious filtering.
Multichannel reactive power compensation circuit is set in the low-pressure reactive compensation and filtering cabinet, and every road reactive power compensation circuit is string
Join circuit, including reactive-load compensation capacitor, reactive compensation reactor；The multichannel reactive power compensation circuit includes by reactor L7
~L30, capacitor C7~C30, switch K3-1~K10-324 road reactive power compensation circuits being composed in series；Wherein reactor L7, capacitor
Device C7, switch K3-1Series connection is reactor L8, capacitor C8, switch K all the way3-2Series connection for all the way, and so on, until reactance
Device L30, capacitor C30, switch K10-3Series connection is all the way, to form 24 road reactive power compensation circuits；24 road reactive power compensation circuits are by suitable
The every three series circuit parallel connections of sequence are one group, one fuse RD of each group of series connectionX, X 3-10；Low-pressure reactive compensation and filtering
Reactive-load compensation capacitor in cabinet uses large capacity low pressure self healing capacitor, and the reactance Rate of reactive compensation reactor selects
0.1%~1%.Be conducive to inhibit surge voltage and surge current.
The voltage control method of electric arc furnace low-pressure reactive compensation and filter, it is characterised in that: the electric furnace controlling
Platform optimizes power supply curve parameter, control electric arc furnaces on-load regulator transformer output optimization power supply curve voltage according to electric arc furnaces；Again
Graphite electrode voltage by optimization power supply curve regulating and controlling voltage electric arc furnaces in the different smelting stages, while regulating and controlling low-pressure reactive compensation
With the end voltage of filtering cabinet；That is, realizing the regulation of electric arc furnaces active power and the regulation of electric arc furnace low-pressure reactive compensation amount；Electricity
Arc furnace low-pressure reactive compensation amount is directly proportional to the end voltage of cabinet, and end voltage increases low-pressure reactive compensation amount and increases, and holds voltage drop
Low reactive compensation amount is reduced；Optimization power supply curve is by the power supply curve of electric arc furnace smelting technique initialization, is that description electric arc furnaces exists
Each curve smelting stage graphite electrode operating voltage and changing over time.
The beneficial effects of the present invention are: the optimization power supply curve voltage exported using electric arc furnaces on-load regulator transformer,
Regulate and control the end voltage of electric arc furnaces graphite electrode voltage and electric arc furnace low-pressure reactive compensation and filtering cabinet；Realize electric arc furnaces wattful power
The control of rate and low-pressure reactive compensation amount；Series connection is combined using the multichannel being arranged in electric arc furnace low-pressure reactive compensation and filtering cabinet
Current resonance circuit filters out 2,3,5 subfrequencies of electric arc furnaces；That is 2 road 100Hz2 subharmonic filter circuits；3 road 150Hz3
Subharmonic filter circuit；1 road 250Hz5 subharmonic filter circuit.
This scheme has following technical advantage:
(1) the optimization power supply curve voltage for utilizing electric arc furnaces, regulates and controls electric arc furnace low-pressure reactive compensation amount；It avoids tradition and uses switch
The reactive compensation mode of switched capacitor, has evaded the use of high current fling-cut switch, has also evaded the arteries and veins of fling-cut switch generation
Voltage and surge current are rushed, the pollution to power grid environment is reduced；
(2) electric arc furnaces on-load regulator transformer voltage adjusts, the voltage difference very little of voltage gear, and voltage is mentioning step by step by a small margin
It rises or reduces, the surge voltage and surge current all very littles that voltage adjustment generates；Traditional switch switched capacitor adjusts idle benefit
The amount of repaying, surge voltage and surge current are bigger, cause various harm to capacitor, capacity decline, tg δ increase, insulation accelerates
Aging, capacitor life-span reduce；
(3) multichannel combination current serial-resonant filter circuit is utilized, 2,3,5 subharmonic of electric arc furnaces is filtered out；Filter effect is better than
Traditional detuning filtering mode, series resonant circuit tuning are easy.
Detailed description of the invention
Fig. 1 is electric arc furnace low-pressure reactive compensation and filter connection schematic diagram of the invention.
Fig. 2 is a kind of low-pressure reactive compensation and filtering cabinet circuit figure of the invention.
Fig. 3 is a kind of optimization power supply curve schematic diagram of the invention.
In Fig. 1: supply network 1, high-voltage circuitbreaker 2, high voltage reactor 3, electric arc furnaces on-load regulator transformer 4, low pressure is short
Net 5, flexible-cable 6, graphite electrode 7, furnace body and water-cooling system 8, low-pressure reactive compensation and filtering cabinet 9, electric furnace controlling platform 10.
In Fig. 2: voltmeter V, ammeter A, Rogowski coil mutual inductor M, fuse RD1~RD10, indicator light LED1~
LED10, switch K1-1~K2-3Combine resonant mode filter circuit service switch, switch K3-1~K10-3The setting of low-pressure reactive compensation amount
It is switched with maintenance circuit；Filter circuit: being connected by reactor L1~L6 with capacitor C1~C6, forms 6 road harmonic filter circuits；
Reactive power compensation circuit: being connected by reactor L7~L30 with capacitor C7~C30, forms 24 road reactive power compensation circuits.
In Fig. 3: optimization power supply curve schematic diagram, I power-off, charging, II, which is powered, opens arc (430v, 5min), and III is molten for the first time
Change power supply (550v, 15~20min), IV first time powered off, and slagged tap, feeding, and V second of energizations are opened arc (430v, 5min), and VI
Second of fusing power supply (550v, 15~20min), VII refining power supply (490v, 15~20min)；VIII power-off, tapping.
Specific embodiment
The following are the present invention to the specific design scheme of the low-pressure reactive compensation of 40 tons of electric arc furnaces and filtering cabinet, but
It is not intended to limit the scope of the present invention.
(1) reactive compensation demand calculates: electric arc furnaces on-load regulator transformer capacity 25000KVA.Low-pressure side Cos φ 1=
0.84, rated power P=25000 × 0.84=21000KW；Power factor arrives Cos φ 2 >=0.92 by Cos φ 1=0.84, compensation,
It tables look-up to obtain penalty coefficient k=0.22；
Compensation rate demand calculates: the ≈ of Q=P × k=21000 × 0.22 4620kvar；
(2) capacitor selects: filter condenser Q=100kvar, U1288.86 μ F of=1.05kv(capacitance), compensation capacitor Q=
50kvar, U2=0.63kv；Each cabinet design filter condenser 6, compensation capacitor 24；
(3) power supply curve, the relationship of each stage electrode voltage and reactive compensation amount are optimized in order to describe electric arc furnaces；Introduce low pressure without
When function compensates stage voltage each with filtering cabinet, the calculation formula of reactive compensation amount:
Q=a (U1/ U0)2Q1+ b (U2/ U0)2Q2
In formula: the total compensation rate of Q capacitor, Q1For each filter condenser calibration compensation amount (kvar), Q2For each compensating electric capacity
Device calibration compensation amount (kvar), U0Capacitor real work voltage (v), U1(v) for filter condenser nominal voltage value, U2To mend
Repay capacitor nominal voltage value (v), the filter condenser number of a=6, the compensation capacitor number of b=24；
Melting stage: Q550V=6 (550V ÷ 1005V)2× 100kvar+24 (550V ÷ 630V)2×50kvar
=179.6+914.6=1094kvar
Refining period: Q490V=6 (490V ÷ 1005V)2× 100kvar+24 (490V ÷ 630V)2× 50kvar=142.5+
725.9=868.5kvar
Open the arc phase: Q430V=6 (430V ÷ 1005V)2× 100kvar+24 (430V ÷ 630V)2× 50kvar=109.8+
558.9=668.8kvar
(4) electric-arc furnace steelmaking power up phase concentrates on melting stage, and melting stage electrode voltage is 550v voltage, the benefit of calculable capacitor
The amount of repaying Q=1094kvar；
(5) electric arc furnace low-pressure reactive compensation and filter and its voltage control method are by 9 face low-pressure reactive compensations and filtering cabinet
Composition；Every 3 face cabinet of phase configuration；Total compensation rate Q=1094kvar × 3 of equipment × 1.73 ≈ 5677kvar；
5677kvar > 4620kvar can satisfy demand (this cabinet design highest work electricity of the low-pressure reactive compensation of electric arc furnaces
Pressure is 630v)；
(6) filter condenser selects higher work compression resistance, by 288.86 μ F capacitances, designs 2,3,5 subharmonic filter reactors
Inductance；2 tunnel, 2 subharmonic filter circuit is set in each cabinet, 3 tunnel, 3 subharmonic filter circuit is set, 1 tunnel of setting 5 times is humorous
Wave filter circuit；
(7) filter circuit uses filter condenser C1, filter reactor L1, switch K1-1It is composed in series the filtering of 2 subharmonic of the first via
Circuit；Filter condenser C2, filter reactor L2, switch K1-2It is composed in series 2 subharmonic filter circuit of the second tunnel；Filter capacitor
Device C3, filter reactor L3, switch K1-3It is composed in series 5 subharmonic filter circuits；Above No. three filter circuit parallel connection is one group,
It connects a RD1 fuse；Filter condenser C4~C6, filter reactor L4~L6, switch K2-1~K2-3It is composed in series 3 tunnels 3
Subharmonic filter circuit, above No. three filter circuit parallel connection are one group, RD2 fuse of connecting；
(8) by capacitor C7~C30, reactor L7~L30, switch K in cabinet3-1~K10-3, form 24 road low-pressure reactive compensations
Circuit；The reactance Rate of reactor selects 0.1%~1%；Every three roads reactive power compensation circuit parallel connection is one group, and series connection one is corresponding
RD3~RD10 fuse.
Although with reference to the foregoing embodiments, invention is explained in detail, for those skilled in the art,
It still can carry out and modify to technical solution documented by foregoing embodiments, or carry out to part of technical characteristic
Equivalent replacement, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in
Within protection scope of the present invention.
Claims (7)
1. a kind of electric arc furnace low-pressure reactive compensation and filter, including supply network, high-voltage circuitbreaker, high voltage reactor, electricity
Arc furnace on-load regulator transformer, the short net of low pressure, flexible-cable, graphite electrode, furnace body and water-cooling system, low-pressure reactive compensation and filtering machine
Cabinet, electric furnace controlling platform；It is characterized by: the supply network, high-voltage circuitbreaker, high voltage reactor, electric arc furnaces on-load voltage regulation
The short net of transformer, low pressure, flexible-cable, graphite electrode, furnace body and water-cooling system are linked in sequence；The low-pressure reactive compensation and filtering machine
Cabinet connects in short net end, and internal setting multichannel reactive power compensation circuit and multichannel combine resonant mode filter circuit.
2. electric arc furnace low-pressure reactive compensation according to claim 1 and filter, it is characterised in that: the multichannel group
Close the 2 subharmonic filter circuits that resonant mode filter circuit includes: 2 road 100Hz, the 3 subharmonic filter circuits of 3 road 150Hz and 1
The 5 subharmonic filter circuits of road 250Hz, every road harmonic filter circuit are series circuit, including filter condenser, filter reactance
Device.
3. electric arc furnace low-pressure reactive compensation according to claim 2 and filter, it is characterised in that: 2 tunnels
The 2 subharmonic filter circuits of 100Hz, including by reactor L1, capacitor C1, air switch K1-1The first via being composed in series 2 times
Harmonic filter circuit；By reactor L2, capacitor C2, air switch K1-2The 2 subharmonic filter circuit of the second tunnel being composed in series；
The 5 subharmonic filter circuits of the 1 road 250Hz, by reactor L3, capacitor C3, air switch K1-3It is composed in series；First
2 subharmonic filter circuit of road, 2 subharmonic filter circuit of the second tunnel, the 5 subharmonic filter circuits of 1 road 250Hz are in parallel, it is whole with
Fuse RD1 series connection；The 3 subharmonic filter circuits of the 3 road 150Hz, including opened by reactor L4, capacitor C4, air
Close K2-1The 3 subharmonic filter circuit of the first via being composed in series；By reactor L5, capacitor C5, air switch K2-2It is composed in series
3 subharmonic filter circuit of the second tunnel；By reactor L6, capacitor C6, air switch K2-3The third road being composed in series 3 times is humorous
Wave filter circuit；3 subharmonic filter circuit of the first via, 3 subharmonic filter circuit of the second tunnel, 3 subharmonic filter circuit of third road
It is in parallel, whole to connect with fuse RD2.
4. electric arc furnace low-pressure reactive compensation according to claim 1 and filter, it is characterised in that: the low-voltage reactive power
Multichannel reactive power compensation circuit is set in compensation and filtering cabinet, every road reactive power compensation circuit is series circuit, including reactive compensation
Capacitor, reactive compensation reactor.
5. electric arc furnace low-pressure reactive compensation according to claim 4 and filter, it is characterised in that: the multichannel without
Function compensation circuit includes by reactor L7~L30, capacitor C7~C30, switch K3-1~K10-3The idle benefit in 24 roads being composed in series
Repay circuit；Wherein reactor L7, capacitor C7, switch K3-1Series connection is reactor L8, capacitor C8, switch K all the way3-2Series connection
For all the way, and so on, until reactor L30, capacitor C30, switch K10-3Series connection is all the way, 24 tunnel reactive compensation of composition is electric
Road；Every three series circuit parallel connections are one group to 24 road reactive power compensation circuits in order, one fuse RD of each group of series connectionX, X is
3-10。
6. electric arc furnace low-pressure reactive compensation according to claim 4 and filter, it is characterised in that: low-pressure reactive compensation
Large capacity low pressure self healing capacitor, the reactance Rate of reactive compensation reactor are used with the reactive-load compensation capacitor in filtering cabinet
Selection 0.1%~1%.
7. the voltage control method of a kind of electric arc furnace low-pressure reactive compensation described in claim 1 and filter, feature exist
In: the electric furnace controlling platform optimizes power supply curve parameter according to electric arc furnaces, and control electric arc furnaces on-load regulator transformer output is excellent
Change power supply curve voltage；Graphite electrode voltage by optimization power supply curve regulating and controlling voltage electric arc furnaces in the different smelting stages again, together
When regulation low-pressure reactive compensation and filter cabinet end voltage；Optimization power supply curve is the power supply by electric arc furnace smelting technique initialization
Curve is the curve for describing electric arc furnaces and changing over time in each smelting stage graphite electrode operating voltage.
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Cited By (1)
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