CN1507129A - Reactive power conpensating method - Google Patents
Reactive power conpensating method Download PDFInfo
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- CN1507129A CN1507129A CNA021555729A CN02155572A CN1507129A CN 1507129 A CN1507129 A CN 1507129A CN A021555729 A CNA021555729 A CN A021555729A CN 02155572 A CN02155572 A CN 02155572A CN 1507129 A CN1507129 A CN 1507129A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000003723 Smelting Methods 0.000 claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims description 32
- 230000008569 process Effects 0.000 claims description 18
- 238000013461 design Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 2
- 238000011065 in-situ storage Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 5
- 239000005997 Calcium carbide Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 239000002075 main ingredient Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229920002338 polyhydroxyethylmethacrylate Polymers 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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
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Abstract
The reactive power compensating method for ore-smelting furnace has reactive power compensating set on the lower voltage side of the smelting transformer and short nets after the compensating point in basically the same length and performs in-situ reactive power compensation via the short nets of the ore-smelting furnace in the control mode of phase splitting compensation to regulate the voltage level of the compensating point.
Description
Technical field
The present invention relates to the Non Power Compensation Process in a kind of smelting equipment power supply field, particularly relate to the short network reactive power compensation method of the hot stove in a kind of ore deposit.
Background technology
See also shown in Figure 1, the hot stove Non Power Compensation Process in existing ore deposit, be high pressure compensation both at home and abroad, promptly high-pressure side or the medium voltage side at the mine heat furnace smelting transformer carries out reactive power compensation to high-tension line, takes compensation condenser star or triangle are connected the method that the back suitable reactor of series connection is parallel to compensation point.
Above-mentioned Non Power Compensation Process, though can improve the apparent power factor of network, reduce the reactive loss of transmission line, but when reality is used, because the operating voltage of the short net of mine heat furnace smelting step down side is not higher than 200V, working power is all greater than more than 10000 amperes, and the reactive power consumption overwhelming majority that smelting electric arc produces is embodied in transformer and short online, causes high pressure compensation not reach the shortcoming of reduction smelting transformer and the short net reactive power consumption of low-pressure side.
This shows that above-mentioned existing smelting transformer high-pressure side Non Power Compensation Process is demanded urgently being improved.
Because the defective that above-mentioned existing smelting transformer high-pressure side Non Power Compensation Process exists, the design people is based on abundant practical experience and professional knowledge, actively studied innovation, through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
Technical problem underlying to be solved by this invention is, overcome the defective that existing smelting transformer high-pressure side Non Power Compensation Process exists, and a kind of short network reactive power compensation method of smelting transformer low-pressure side is provided, and make it increase transformer and transmission line capacity, reduce reactive power consumption.
The present invention solves its technical problem underlying and realizes by the following technical solutions.The method that proposes according to the present invention, before design, actual measurement ax phase, by phase, 24 hours voltage curves of cz phase compensation point and whole humorous wave component.According to measurement result, according to the following equation:
Q＝P*(tg?
1-tg?
2)
Wherein: P is a power
Q is a capacity
1,
2For compensating forward and backward power factor
ΔU＝Q
1*X/1000U
Wherein: Q
1Be a certain single-phase compensation capacity
Actual measurement reactance value when X compensates preceding operation mutually for this
U is this phase compensation point voltage after compensating
Δ U is compensation front and back, compensation point voltage difference
Calculate the every mutually required building-out capacitor amount and the operating voltage of capacitor respectively.Because the operating mode situation when smelting differs, the voltage of a certain phase is a phasic Chang, for this being compensated mutually the target voltage after preceding minimum voltage is adjusted to compensation, so the building-out capacitor amount of each phase is that benchmark calculates with the minimum operation voltage of compensation point before compensation all.For smelting maximum and the minimum value that obtains each phase voltage in the normal cycle,, determine the every mutually required building-out capacitor amount and the operating voltage of capacitor at last in conjunction with improving the required calculating capacitance of power factor.
Determining of target voltage will be to satisfy under the prerequisite that improves the required building-out capacitor amount of operate power factor, and the working voltage after the compensation of assurance compensation point is as far as possible near the rated voltage of smelting transformer when this grade moves.
According to the harmonic wave test report, the branch concrete condition suitable reactor of connecting, to ensure the safe operation of capacitor, and absorption portion harmonic current on the spot, be that the circuit of Main Ingredients and Appearance need seal in 14% reactor for example, to being that the circuit of Main Ingredients and Appearance then need seal in 7% reactor with 5,7 harmonic waves with 3 subharmonic.
See also shown in Figure 2ly, the selection of compensation point will make the short net length basically identical behind the compensation point.
See also shown in Figure 4 equal substantially for making the electrode pair ground voltage because inconsistent in the short net length of compensation before the access point, the ax phase, the by phase is designed to unequal building-out capacitor amount mutually with cz.In smelting process, control system also will increase and decrease the group number (change capacity) of building-out capacitor in real time automatically according to the voltage condition of capacitor voltage at both ends and compensation point.Control circuit monitors the voltage at compensation point and building-out capacitor two ends, according to power factor or some capacitance compensation branch road of The optimal compensation amount cut-out/connection, carries out the adjusting of reactive power compensation amount by Programmable Logic Controller.
See also shown in Figure 3ly, each is connected with the end of incoming cables of a pair of low-voltage circuit breaker compensation point, and the leading-out terminal of low-voltage circuit breaker some capacitance compensation branch roads in parallel, every capacitance compensation branch road have all been gone here and there reactor and building-out capacitor, and discharge resistance is in parallel with building-out capacitor.Wherein:
Low-voltage circuit breaker: make protection usefulness, and play when doing maintenance all capacitors are disconnected purpose in major loop.
Fast acting fuse: overload main and capacitor is protected fast.
Series reactor:, form the certain frequency resonant tank with capacitor according to the actual measurement harmonic component.High order harmonic component is absorbed, avoids system resonance.
Contactor: according to the voltage levvl at compensation point and these capacitor two ends, the input of control capacitor and excision.
Capacitor: make reactive power source and use, and form the loop with series reactor, this loop can absorb harmonic wave owing to itself have certain harmonic frequency, in it with discharge resistance, when cut, can within a certain period of time capacitor institute energy content be put lsafety level to national regulation.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, the present invention is located at compensation point at the pair end of smelting transformer, and all inconsistent phenomenon of voltage of arranging unbalanced inconsistent, the every phase compensation point of three-phase electrode material feeding that causes at the short net three-phase of the hot stove in ore deposit, do not wait the mode of compensation rate to regulate the voltage of three-phase compensation point with phase-splitting, make the three-phase electrode material feeding balanced than before, improved the smelting situation.
In sum, Non Power Compensation Process of the present invention, it is in limited field, technical development space, no matter structurally or bigger improvement all arranged on the function, and have large improvement technically, and produced handy and practical effect, and have the effect of enhancement really, thereby being suitable for practicality more, really is a new and innovative, progressive, practical new design.
The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is common hot stove high-pressure side, ore deposit reactive power compensation circuit schematic diagram.
Fig. 2 is a compensation point position view of the present invention.
Fig. 3 is single phase of the present invention (AX phase) reactive power compensation main loop circuit schematic diagram.
Fig. 4 is single phase of the present invention (AX phase) reactive power compensation control loop circuit theory diagrams.
Wherein: 1. electrode 2. smelting transformer 3. high pressure inlet wires 4. voltage transmitters 5. capacitor switching contactor coil 6.A/D input ports 7. relay output end mouths 8. compensation points 9. low-voltage circuit breakers 10. fast acting fuses 11. contactors 12. series reactors 13. building-out capacitors 14. discharge resistances
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to its embodiment of Non Power Compensation Process, structure, feature and the effect thereof that foundation the present invention proposes, describe in detail as after.
See also Fig. 2, Fig. 3, shown in Figure 4, Non Power Compensation Process of the present invention, it mainly comprises: compensation point (8) in the step down side outlet or short net jump and get along, and the short net length basically identical behind the compensation point, phase splitting compensation adjusting compensation point voltage levvl.Its mainly by before the design and the building-out capacitor amount in when design determine in method, the smelting process control system in real time automatically the method for the group number (change capacity) of increase and decrease building-out capacitor formed.
For example: the power factor of actual measurement 10000KVA furnace of calcium carbide is 0.86, for power factor is brought up to more than 0.90, then required reactive power compensation amount is Qc=10000 * (tgarccos0.86-tgarccos0.90)=1100Kvar, and the phase splitting compensation amount is about 1100/3=400Kvar.
Recording compensation point minimum voltage: ax again is 137V for 140V, cz for 132V, by mutually mutually mutually.
Record the reactance of compensation phase: ax is that 3.67 Ω, by are that 2.57 Ω, cz are 2.94 Ω mutually mutually mutually.
If by phase compensation rate is 400Kvar, on the basis of 140V, its compensation point voltage will rise between the 146-148V.With this voltage is benchmark, and ax phase, cz phase compensation point voltage are risen between the 146-148V, and then required compensation rate is respectively 600Kvar, 500Kvar, and promptly last total calculating compensation rate is 1500Kvar.
China Metallurgical Techn Co uses this method on the 10000KVar of Golconda calcium carbide factory of Hydron company of the power administration furnace of calcium carbide of Wuhai City, the Inner Mongol be the example of a success.Compensation capacity 1512KVar, ax phase 576KVar wherein, by phase 504KVar, cz phase 432KVar.
See also shown in Figure 3, the hot stove Non Power Compensation Process in ore deposit of the present invention, its each phase reactive power compensation major loop connects some groups of building-out capacitor circuit by low-voltage circuit breaker (9) line outlet, and composition of each group building-out capacitor circuit is: the be linked in sequence parallel circuits of contactor (11), series reactor (12), building-out capacitor (13) and discharge resistance (14) of fast acting fuse (10).
See also shown in Figure 4, the hot stove Non Power Compensation Process in ore deposit of the present invention, compensation point is in the pair end of smelting transformer (2); High pressure inlet wire (3) side does not connect reactive power compensation electric capacity; Electrode (1) equates substantially with distance between the compensation point; Its control circuit is made up of voltage transmitter (4), Programmable Logic Controller (PLC) and capacitor switching contactor coil (5), compensation condenser both end voltage and compensation point voltage, by the input of delivering to voltage transmitter (4) after the shielding of test lead process, the output of voltage transmitter (4) connects the A/D input port (6) of PLC, relay output end mouth (7) the control capacitance contactor coil (5) of PLC is used for on/off part compensation condenser.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present invention all still belongs in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (3)
1. hot stove Non Power Compensation Process in ore deposit is characterized in that: compensation point in the step down side outlet or short net jump and get along, with the control mode that phase splitting compensation is regulated the compensation point voltage levvl, the short net of the hot stove in ore deposit is carried out reactive power compensation on the spot.
2. the hot stove Non Power Compensation Process in ore deposit according to claim 1 is characterized in that wherein said compensation point, and the selection of its position will make the short net length basically identical of each phase behind compensation point.
3. the hot stove Non Power Compensation Process in ore deposit according to claim 1, it is characterized in that wherein said control mode of regulating the compensation point voltage levvl with phase splitting compensation, be before design, actual 24 hours voltage curves and whole humorous wave component when measuring each phase compensation point place not compensated respectively; During design, the building-out capacitor amount of each phase is that benchmark calculates with the minimum operation voltage of compensation point before compensation all, determine the reactor that each should be connected mutually according to the harmonic wave test report, when the short net length before the compensation access point was inconsistent, each was designed to unequal building-out capacitor amount mutually; In smelting process, control system increases and decreases the group number (change capacity) of building-out capacitor in real time automatically according to the voltage condition of capacitor voltage at both ends and compensation point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021555729A CN1310392C (en) | 2002-12-11 | 2002-12-11 | Reactive power conpensating method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021555729A CN1310392C (en) | 2002-12-11 | 2002-12-11 | Reactive power conpensating method |
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| Publication Number | Publication Date |
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| CN1507129A true CN1507129A (en) | 2004-06-23 |
| CN1310392C CN1310392C (en) | 2007-04-11 |
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|---|---|---|---|
| CNB021555729A Expired - Lifetime CN1310392C (en) | 2002-12-11 | 2002-12-11 | Reactive power conpensating method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728831B (en) * | 2008-10-20 | 2012-02-15 | 乐山晟嘉电气有限公司 | Method for low-voltage thyristor reactive compensation switching of metallurgical electric furnace |
| CN101728832B (en) * | 2008-10-20 | 2012-08-29 | 乐山晟嘉电气有限公司 | Method for low-voltage phase-splitting reactive compensation of metallurgical electric furnace |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1012868B (en) * | 1989-06-24 | 1991-06-12 | 西安煤矿机械厂 | State type automatic compensation method of reactive power |
| JPH09182296A (en) * | 1995-12-20 | 1997-07-11 | Aichi Electric Co Ltd | Reactive power compensation device |
| CN2315698Y (en) * | 1997-10-31 | 1999-04-21 | 郑学超 | Transformer type static dynamic reactive compensator |
| JP3590276B2 (en) * | 1998-10-22 | 2004-11-17 | 松下電器産業株式会社 | Reactive power compensator |
-
2002
- 2002-12-11 CN CNB021555729A patent/CN1310392C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728831B (en) * | 2008-10-20 | 2012-02-15 | 乐山晟嘉电气有限公司 | Method for low-voltage thyristor reactive compensation switching of metallurgical electric furnace |
| CN101728832B (en) * | 2008-10-20 | 2012-08-29 | 乐山晟嘉电气有限公司 | Method for low-voltage phase-splitting reactive compensation of metallurgical electric furnace |
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| Publication number | Publication date |
|---|---|
| CN1310392C (en) | 2007-04-11 |
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Owner name: CHINA METALLURGICAL EQUIPMENT CO., LTD. Free format text: FORMER OWNER: CHINA METALLURGICAL TECHN CO. Effective date: 20041015 |
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Address after: No. 8, Haidian Avenue, Beijing, Haidian District Patentee after: SINOSTEEL EQUIPMENT & ENGINEERING Co.,Ltd. Address before: No.1 South Garden Street, Beijing, Chaoyang District Patentee before: ZHONGGANG EQUIPMENT Co.,Ltd. |
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Assignee: CHINA METALLURGICAL ENGINEERING Co.,Ltd. Assignor: SINOSTEEL EQUIPMENT & ENGINEERING Co.,Ltd. Contract fulfillment period: 2008.11.14 to 2013.11.14 Contract record no.: 2008990001432 Denomination of invention: Reactive power conpensating method Granted publication date: 20070411 License type: Exclusive license Record date: 20081211 |
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Address after: 100080, No. 8 Haidian street, Beijing, Haidian District Steel International Plaza, twenty-six floor Patentee after: SINOSTEEL EQUIPMENT & ENGINEERING Co.,Ltd. Address before: 100080 Haidian street, Beijing, No. 8, No. Patentee before: SINOSTEEL EQUIPMENT & ENGINEERING Co.,Ltd. |
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