CN202261161U - Low-voltage frequency conversion control system for high-power alternating-current rolling mill - Google Patents
Low-voltage frequency conversion control system for high-power alternating-current rolling mill Download PDFInfo
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- CN202261161U CN202261161U CN2011203916562U CN201120391656U CN202261161U CN 202261161 U CN202261161 U CN 202261161U CN 2011203916562 U CN2011203916562 U CN 2011203916562U CN 201120391656 U CN201120391656 U CN 201120391656U CN 202261161 U CN202261161 U CN 202261161U
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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Abstract
The utility model discloses a low-voltage frequency conversion control system for a high-power alternating-current rolling mill. Aims of saving energy and reducing consumption are fulfilled by using a 12-pulse power supply mode, selecting a rectification feedback unit with a self-coupling transformer and feeding regenerative energy of the system back to a power grid. A rectification part of the system supplies energy to an inverter in a manner that the rectification feedback unit is connected in parallel with a rectification unit; and an output of the inverter adopts a master and slave inversion control mode, so that the problem about high-power inversion output is solved. The aspects, such as frequency range, dynamic correspondence, speed regulation precision, low-frequency torque, rotation difference compensation, communication function, intelligent control, power factor, work efficiency, convenience for use and the like, of the frequency conversion and the speed regulation are much higher than those of the conventional speed regulation mode; the low-voltage frequency conversion control system has the advantages of small volume, light weight, high generality, wide dragging field, complete protection function, high reliability, convenience for operation and the like, is very popular in industries, such as steel, metallurgy, mines, petroleum, petrochemistry, chemical engineering, medicines, spinning, machinery, electric power, light industries, building materials, papermaking, printing, cigarettes, water and the like, and has outstanding social benefits.
Description
Technical field:
The utility model belongs to the metallurgical processing field, is specifically related to a kind of low-voltage variable frequency control system that is used for the high power AC milling train.
Background technology:
Milling train is quite general in the metallurgical processing sector application, and in the main and auxiliary transmission speed-regulating system of all types of milling trains, electric drive partly adopts direct-current driving device control more.But there are shortcomings such as volume is heavy, brush damages easily and brush-commutated electromagnetic radiation is violent, maintenance workload is big in dc speed-regulating motor.Simultaneously, when powerful motor is done to drive, adopt the high voltage supply mode more, high-voltage motor equipment, high voltage power distribution, personal safety etc. are all had higher requirement, input and working service cost are higher.
Because the power of motor of milling train is common bigger, generally surpass 1000KW.Therefore, three-phase AC asynchronous motor is used rare especially on milling train.In the non-ferrous metal processing and other fields, generally below 1500KW, if select high-voltage alternating, direct current machine to carry out speed regulating control, cost is inevitable higher for the power of motor of use milling train at present.
The utility model content:
The utility model overcomes above-mentioned shortcoming, provide a cover principle simple, safe in utilization, convenient for installation and maintenance, factory's low-voltage distribution is not had harsh low-voltage variable frequency control system that require, that on high-power milling train, use.
Technical scheme: a kind of low-voltage variable frequency control system that is used for the high power AC milling train; Factory's distribution is through the three-phase alternating current of 30 ° of potential isolation of one 12 pulsation output transformer two phase difference of generation; After of this three-phase alternating current connects lead-in circuit breaker QF1, inlet wire contactor KM1 and inlet wire reactor L1 successively; UF1 is connected with the rectification feedback unit, rectification feedback unit UF1 output be connected from inversion unit UF5, should be connected with the high-power machine of conducting electricity of assisting from inversion unit UF5 output; After another of three-phase alternating current connected lead-in circuit breaker QF2, inlet wire contactor KM2 and inlet wire reactor L2 successively, UF2 was connected with rectification unit, and rectification unit UF2 is connected with main inversion unit UF4, and this main inversion unit UF4 output is connected with the main machine of conducting electricity; Parallelly connected from inversion unit UF5 with main inversion unit UF4.
On main inversion unit UF4 and show an inversion unit UF3.
UF1 is a 1500kw rectification feedback unit, and UF2 is the 1500kw rectification unit; UF3 is the 800kw inversion unit; UF4 is 1500kw master's inversion unit, and UF5 is that 1500kw is from inversion unit.
Rectification feedback unit UF1 comprises the rectifying part of two parallel connections, and the output of two rectifying part links together, and two inputs link together through autotransformer L4.
Be connected with the high-power auxilliary machine of conducting electricity through outlet reactor L5 from inversion unit UF5 output.
The electric power incoming line of native system is 12 pulse power supplies, and factory's distribution only need be selected a transformer with two secondary windings for use, generates the three-phase alternating current system of 30 ° of potential isolation of two phase differences, and output voltage is AC690V.
Native system is chosen the rectification feedback unit, mixes autotransformer, and the Way of Regenerating Energy Feedback of system to electrical network, is reached energy saving purposes.
It is that inverter provides DC bus-bar voltage that the rectifying part of whole system adopts the mode of rectification feedback unit and rectification unit parallel connection.
Principal and subordinate's inversion control pattern is taked in the output of high power contravariant device, solves the problem that single inverter can not drive heavy-duty motor.
Whole system adopts the PLC centralized control, and PLC and each device unit constitute the Profibus-DP network, and touch-screen HMI shows and setup parameter.
Beneficial effect: the system of the utility model utilizes supply power mode to adopt 12 pulse power supply modes, chooses the rectification feedback unit, mixes autotransformer, and the Way of Regenerating Energy Feedback of system to electrical network, is reached energy saving purposes.It is that inverter provides energy that the rectifying part of system adopts the mode of rectification feedback unit and rectification unit parallel connection.The output of inverter takes principal and subordinate's inversion control pattern to solve high power contravariant output problem.Because it is incomparable that frequency control is in the past mode of speed regulation at frequency range, dynamic corresponding, adjusting speed accuracy, low-frequency torque, slip compensation, communication function, Based Intelligent Control, power factor, operating efficiency, aspect such as easy to use; It is little, in light weight with volume, highly versatile, the field that drags is wide, defencive function is perfect, reliability is high, advantage such as easy and simple to handle; Receive the welcome of industries such as iron and steel, metallurgy, mine, oil, petrochemical industry, chemical industry, medicine, weaving, machinery, electric power, light industry, building materials, papermaking, printing, cigarette, running water deeply, the social benefit highly significant.
Description of drawings:
Fig. 1 is the utility model circuit theory diagrams.
Label 1 is 12 pulse transformers among the figure, and 2 is main rectification unit, and 3 is main inversion unit, and 4 is from rectification unit, and 5 is from inversion unit.
Embodiment:
Among Fig. 1, QF1, QF2 are lead-in circuit breaker; KM1, KM2 are the inlet wire contactor; UF1 is a 1500kw rectification feedback unit, and UF2 is the 1500kw rectification unit; UF3 is the 800kw inversion unit; UF4 is 1500kw master's inversion unit, and UF5 is that 1500kw is from inversion unit; L1, L2 are that inlet wire reactor, L3 are the outlet reactor; L4 is an autotransformer; L5 is the outlet smoothing reactor.
Factory's transformer is 12 pulsation output transformers; Require phase difference 30 degree; Lead-in circuit breaker QF1, QF2 are the electronic storage circuit breaker of band communication function, have functions such as the phase failure, overvoltage, under-voltage, ground protection, can realize the effective protection to rectification feedback unit and rectification unit; KM1, KM2 close a floodgate, and send electricity to rectification feedback unit and rectification unit, and during emergency, KM1, KM2 separating brake break off the said apparatus power supply; 1500kw rectification feedback unit and the parallel connection of 1500kw rectification unit dc bus realize the device dilatation is reached 3000kw; Load drives two inversion units; The single inversion unit of the machine that conducts electricity for 800KW is auxilliary, another is conduct electricity principal and subordinate's inversion unit of machine of 1 1500KW master, principal and subordinate's inversion unit is used by two single inversion unit parallel connections of 800KW again; The fiber data exchange realizes the increase-volume to inverter.
The regenerated energy (generating state energy) that produces when the main and auxiliary machine that conducts electricity is worked in the rolling machine system can cause that the DC bus-bar voltage of rectification feedback unit and rectification unit parallel connection rises; For this part unnecessary energy can in time be fed back on the electrical network; The rectification feedback unit must be in generating state work; The line voltage that needs to be added on the inverter bridge improves 20%, increases autotransformer device in rectification feedback unit feedback side when we design and receives electrical network, and realization cooperates with this voltage.
Motor of driven in common is used in the parallel connection of principal and subordinate's inversion unit in the native system, causes the influence to motor in order to eliminate three-phase imbalance output, has increased interphase reactor in the design, is used for weakening the distortion rate influence to motor current waveform.
Claims (5)
1. low-voltage variable frequency control system that is used for the high power AC milling train; It is characterized in that: factory's distribution is through the three-phase alternating current of 30 ° of potential isolation of one 12 pulsation output transformer two phase difference of generation; After of this three-phase alternating current connects lead-in circuit breaker QF1, inlet wire contactor KM1 and inlet wire reactor L1 successively; UF1 is connected with the rectification feedback unit; Rectification feedback unit UF1 output be connected from inversion unit UF5, should be connected with the high-power machine of conducting electricity of assisting from inversion unit UF5 output; After another of three-phase alternating current connected lead-in circuit breaker QF2, inlet wire contactor KM2 and inlet wire reactor L2 successively, UF2 was connected with rectification unit, and rectification unit UF2 is connected with main inversion unit UF4, and this main inversion unit UF4 output is connected with the main machine of conducting electricity; Parallelly connected from inversion unit UF5 with main inversion unit UF4.
2. the low-voltage variable frequency control system that is used for the high power AC milling train according to claim 1 is characterized in that: on main inversion unit UF4 and show an inversion unit UF3.
3. the low-voltage variable frequency control system that is used for the high power AC milling train according to claim 1 is characterized in that: UF1 is a 1500kw rectification feedback unit, and UF2 is the 1500kw rectification unit; UF3 is the 800kw inversion unit; UF4 is 1500kw master's inversion unit, and UF5 is that 1500kw is from inversion unit.
4. the low-voltage variable frequency control system that is used for the high power AC milling train according to claim 1; It is characterized in that: rectification feedback unit UF1 comprises the rectifying part of two parallel connections; The output of two rectifying part links together, and two inputs link together through autotransformer L4.
5. the low-voltage variable frequency control system that is used for the high power AC milling train according to claim 1 is characterized in that: be connected with the high-power auxilliary machine of conducting electricity through outlet reactor L5 from inversion unit UF5 output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203916562U CN202261161U (en) | 2011-10-15 | 2011-10-15 | Low-voltage frequency conversion control system for high-power alternating-current rolling mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203916562U CN202261161U (en) | 2011-10-15 | 2011-10-15 | Low-voltage frequency conversion control system for high-power alternating-current rolling mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202261161U true CN202261161U (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203916562U Expired - Lifetime CN202261161U (en) | 2011-10-15 | 2011-10-15 | Low-voltage frequency conversion control system for high-power alternating-current rolling mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202261161U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226806A (en) * | 2015-11-12 | 2016-01-06 | 云南华联锌铟股份有限公司 | A kind of electric hydaulic forklift power shovel input circuit control device |
-
2011
- 2011-10-15 CN CN2011203916562U patent/CN202261161U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226806A (en) * | 2015-11-12 | 2016-01-06 | 云南华联锌铟股份有限公司 | A kind of electric hydaulic forklift power shovel input circuit control device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120530 |