CN101728832B - Method for low-voltage phase-splitting reactive compensation of metallurgical electric furnace - Google Patents
Method for low-voltage phase-splitting reactive compensation of metallurgical electric furnace Download PDFInfo
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- CN101728832B CN101728832B CN200810046323A CN200810046323A CN101728832B CN 101728832 B CN101728832 B CN 101728832B CN 200810046323 A CN200810046323 A CN 200810046323A CN 200810046323 A CN200810046323 A CN 200810046323A CN 101728832 B CN101728832 B CN 101728832B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000009434 installation Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010438 heat treatment 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 invention discloses a method for the low-voltage phase-splitting reactive compensation of a metallurgical electric furnace, which is characterized in that: the connection mode of a low-voltage filter reactive compensation unit is consistent with the metallurgical electric furnace transformer; and a plurality of unit groups are parallelly connected between AX, BY and CZ. The method solves the problems such as power unbalance and large power consumption in production resulting from furnace three-phase unbalance caused by the switching of a common reactive compensation device and improves economic benefits of enterprises obviously.
Description
Technical field
The present invention relates to the method in the reactive power compensation field, particularly low-voltage phase-splitting reactive compensation of metallurgical electric furnace of metallurgical electric furnace.
Background technology
Traditional fixedly reactive power compensation mode all is to add capacitor in the high-pressure side of metallurgical electric furnace, the idle needs when producing to satisfy electric furnace.Reactive power compensator mainly is made up of equipment such as circuit breaker, contactor, capacitor, discharge coil, overvoltage protection devices, and the mode switching that adopts common three-phase, big capacity (100～300KVar/ only) all-film power capacitor, three-phase to mend altogether is as shown in Figure 1.
There is following problem in this traditional switching mode in the practice process:
One, owing to high energy-consuming industry, metallurgical electric furnace owned enterprise generally is in the remote mountain areas, and power supply network is of poor quality, often has the inclined to one side phase problem of Voltage Harmonic or voltage.Three-phase mends mode altogether because the compensation rate of A, B, C three-phase input is identical, and the effect that voltage promotes is also identical, and this problem will can not get improving; Cause electric furnace three-phase electrode voltage unbalanced; Thereby the heating surface that causes three-phase electrode is or not a plane, the furnace charge inequality of being heated, waste electric energy.
Two, owing to the problem of the short network arrangements of metallurgical electric furnace, A, B, the short net of C three-phase length differ, and its resistance is different, and pressure drop is difference also, though the network access balance of voltage, thus cause three-phase electrode voltage also inequality.When adopting three-phase to mend mode altogether, will cause to cross mutually by force and mend, weak owing mutually mended, and the situation of disequilibrium aggravation also the situation described in can occur.
Summary of the invention
The present invention addresses the above problem the method that metallurgical electric furnace low pressure phase-splitting filter reactive compensation is provided; Three-phase imbalance in the stove that can avoid common reactive power compensator switching and bring and cause power uneven; Problems such as production process power consumption is big obviously improve the business economic benefit.
Technical scheme of the present invention is following:
The low-voltage phase-splitting reactive compensation of metallurgical electric furnace method is characterized in that:
The connected mode of A, low-voltage filter reactive compensation unit is consistent with the metallurgical electric furnace transformer, i.e. each parallelly connected some low-voltage filter reactive compensations unit group between AX, BY, CZ; The capacity of every phase low-voltage filter reactive compensation unit confirms respectively according to the height of network access voltage or the length of the short net of metallurgical electric furnace transformer;
B, on control mode, should adopt the strategy of single-phase controlling of sampling: A, B, C three-phase are divided into fully independently three sub-systems, and through gathering the secondary singal of A, B, C three-phase current voltage transformer in the metallurgical electric furnace transformer high-voltage switch cubicle, the reactive requirement of calculating every phase through the CPU in the controller in real time is to solve the out of phase reactive requirement of electric furnace; Carry out the idle earth balance of three-phase; After certain phase lead rupture, need electrode roasting again, at this moment, electrode is roasting a couple of days from the top down; This phase reactive requirement from small to large; The serious deviation of three-phase reactive requirement for guaranteeing whole reactive requirement, has only the single-phase special requirement that could satisfy special operation condition.
Problems such as the present invention can avoid common reactive power compensator switching and three-phase imbalance and cause power uneven in the stove that brings, and production process power consumption is big obviously improve the business economic benefit.
Description of drawings
Fig. 1 is the structural representation of background technology
Fig. 2 is the structural representation of low-voltage filter reactive compensation of the present invention unit
Fig. 3 is a structural representation of the present invention
Wherein, Reference numeral is 1. current transformer, 2. voltage transformer, 3. A phase current transmitter; 4. B phase current transmitter, 5. C phase current transmitter, 6. A phase voltage transmitter, 7. B phase voltage transmitter; 8. C phase voltage transmitter, 9. A phase controller, 10. B phase controller, 10. B phase controller; (11) C phase controller, (12) A phase filtering compensation unit, (13) B phase filtering compensation unit, (14) C phase filtering compensation unit.
Embodiment
The low-voltage phase-splitting reactive compensation of metallurgical electric furnace method is characterized in that:
The connected mode of A, low-voltage filter reactive compensation unit is consistent with the metallurgical electric furnace transformer, and promptly each parallelly connected some unit group between AX, BY, CZ is as shown in Figure 2.
The capacity of every phase filtering compensation unit confirms respectively according to the height of network access voltage or the length of the short net of metallurgical electric furnace transformer.Owing to install filtering compensation unit rear electrode voltage additional in metallurgical electric furnace transformer three-phase low-pressure side and promote to some extent,, also increase installation in the longest phase of short net length equally so increase installation through calculating mutually at this lower corresponding of network access voltage.
B, on control mode, should adopt the strategy of single-phase controlling of sampling: A, B, C three-phase are divided into fully independently three sub-systems, and through gathering the secondary singal of A, B, C three-phase current voltage transformer in the metallurgical electric furnace transformer high-voltage switch cubicle, the reactive requirement of calculating every phase through the CPU in the controller in real time is to solve the out of phase reactive requirement of electric furnace; Carry out the idle earth balance of three-phase; After certain phase lead rupture, need electrode roasting again, at this moment, electrode is roasting a couple of days from the top down; This phase reactive requirement from small to large; The serious deviation of three-phase reactive requirement for guaranteeing whole reactive requirement, has only the single-phase special requirement that could satisfy special operation condition.
Shown in Fig. 2-3: A, B, C three-phase weak point are netted being uneven in length of steel pipe, and wherein C is the longest mutually, and A is the shortest mutually; So the Capacity design with C phase filtering compensation unit when engineering design becomes maximum, B takes second place mutually, and A is minimum mutually; When if the electrical network primary voltage is uneven, also be same method design.
Each one of three filtering compensation controller A among the figure, B, C three-phase; Through the electric current of each phase, controller input is separately delivered in the voltage transmitter sampling respectively, detects through 16 bit CPUs in the controller and handles; Power factor is dropped into one group of filtering and compensating unit mutually less than one of set point; Power factor is excised one group of unit mutually greater than one of definite value, make its three-phase reach the reactive balance state, the condition generation of avoiding and owed to repay a kindness.
Claims (1)
1. low-voltage phase-splitting reactive compensation of metallurgical electric furnace method, it is characterized in that: the connected mode of low-voltage filter reactive compensation unit is consistent with the metallurgical electric furnace transformer, i.e. each parallelly connected some low-voltage filter reactive compensations unit group between AX, BY, CZ;
The capacity of every phase low-voltage filter reactive compensation unit confirms respectively according to the height of network access voltage or the length of the short net of metallurgical electric furnace transformer; The pass through calculating lower at network access voltage increases installation mutually at this, also increases installation in the longest phase of short net length equally;
On control mode, adopt the strategy of single-phase controlling of sampling; A, B, C three-phase are divided into fully independently three sub-systems; Through gathering the secondary singal of A, B, C three-phase current voltage transformer in the metallurgical electric furnace transformer high-voltage switch cubicle; The reactive requirement of calculating every phase through the CPU in the controller is in real time carried out the idle earth balance of three-phase with the out of phase reactive requirement of solution electric furnace; After certain phase lead rupture, need electrode roasting again, at this moment, electrode is roasting a couple of days from the top down; This phase reactive requirement from small to large, the serious deviation of three-phase reactive requirement is to this type situation; Power factor is dropped into one group of low-voltage filter reactive compensation unit mutually less than one of set point; Power factor is excised one group of low-voltage filter reactive compensation unit mutually greater than one of definite value, make its three-phase reach the reactive balance state, the condition generation of avoiding and owed to repay a kindness.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810046323A CN101728832B (en) | 2008-10-20 | 2008-10-20 | Method for low-voltage phase-splitting reactive compensation of metallurgical electric furnace |
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| CN200810046323A CN101728832B (en) | 2008-10-20 | 2008-10-20 | Method for low-voltage phase-splitting reactive compensation of metallurgical electric furnace |
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| CN101728832A CN101728832A (en) | 2010-06-09 |
| CN101728832B true CN101728832B (en) | 2012-08-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102629765B (en) * | 2012-03-12 | 2015-04-15 | 杭州银湖电气设备有限公司 | Short net side low voltage dynamic reactive power compensation system in metallurgical industry |
| CN105896553A (en) * | 2014-12-12 | 2016-08-24 | 盐城工学院 | Intelligent three-phase split reactive power compensation device |
| CN109066719A (en) * | 2018-09-18 | 2018-12-21 | 山东康润电气股份有限公司 | A kind of reactive power compensator and reactive-load compensation method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2447979Y (en) * | 2000-07-11 | 2001-09-12 | 铁道部第一勘测设计院 | Reactive power compensating arrangement |
| CN1375903A (en) * | 2002-04-26 | 2002-10-23 | 白玉龙 | Secondary low-voltage compensator for electric furnace |
| CN1507129A (en) * | 2002-12-11 | 2004-06-23 | 中国冶金技术公司 | Reactive power conpensating method |
| CN1560978A (en) * | 2004-02-20 | 2005-01-05 | 清华大学 | Distribution type integrated electric energy quality regulator |
| CN1667337A (en) * | 2004-03-10 | 2005-09-14 | 西安重型机械研究所 | Intellectualized dynamic reactive compensation method for electric furnace |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2447979Y (en) * | 2000-07-11 | 2001-09-12 | 铁道部第一勘测设计院 | Reactive power compensating arrangement |
| CN1375903A (en) * | 2002-04-26 | 2002-10-23 | 白玉龙 | Secondary low-voltage compensator for electric furnace |
| CN1507129A (en) * | 2002-12-11 | 2004-06-23 | 中国冶金技术公司 | Reactive power conpensating method |
| CN1560978A (en) * | 2004-02-20 | 2005-01-05 | 清华大学 | Distribution type integrated electric energy quality regulator |
| CN1667337A (en) * | 2004-03-10 | 2005-09-14 | 西安重型机械研究所 | Intellectualized dynamic reactive compensation method for electric furnace |
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Denomination of invention: Method for low-voltage phase-splitting reactive compensation of metallurgical electric furnace Effective date of registration: 20131224 Granted publication date: 20120829 Pledgee: Leshan City Commercial Bank Limited by Share Ltd Sales Department Pledgor: Leshan Chengjia Electric Co., Ltd. Registration number: 2013990001021 |
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Denomination of invention: Method for low-voltage phase-splitting reactive compensation of metallurgical electric furnace Effective date of registration: 20160309 Granted publication date: 20120829 Pledgee: Leshan City Commercial Bank Limited by Share Ltd Sales Department Pledgor: Leshan Shengjia Electric Co., Ltd. Registration number: 2016990000187 |
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Denomination of invention: Method for low-voltage phase-splitting reactive compensation of metallurgical electric furnace Effective date of registration: 20170801 Granted publication date: 20120829 Pledgee: Leshan City Commercial Bank Limited by Share Ltd Sales Department Pledgor: Leshan Shengjia Electric Co., Ltd. Registration number: 2017510000043 |
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