CN101013880A - Special frequency converter for oil pumping unit - Google Patents
Special frequency converter for oil pumping unit Download PDFInfo
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- CN101013880A CN101013880A CN 200710013268 CN200710013268A CN101013880A CN 101013880 A CN101013880 A CN 101013880A CN 200710013268 CN200710013268 CN 200710013268 CN 200710013268 A CN200710013268 A CN 200710013268A CN 101013880 A CN101013880 A CN 101013880A
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- pumping unit
- oil
- circuit
- filter circuit
- motor
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- 238000005086 pumping Methods 0.000 title claims abstract description 20
- 238000001914 filtration Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 abstract description 9
- 239000003129 oil well Substances 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 44
- 230000000694 effects Effects 0.000 description 6
- 238000004134 energy conservation Methods 0.000 description 5
- 238000000605 extraction Methods 0.000 description 5
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- 238000000034 method Methods 0.000 description 4
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- 238000006243 chemical reaction Methods 0.000 description 3
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- 239000002699 waste material Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
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- 230000035939 shock Effects 0.000 description 1
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Abstract
The invention relates to a special frequency converter for an oil pumping unit, wherein a plurality of trigger poles respectively connected with a CPU (2) are connected with a feedback circuit (6) through protective diodes, and the trigger poles are also connected with a motor (5) through a filter circuit (4); the feedback circuit (6) is connected with a power grid through a positive sine wave filter circuit (7); the rectification filter circuit (1) is connected with the IGBT module (3) through a current-limiting resistor and a power supply connector. The remote direct current power supply has the characteristics of reducing line loss and electricity stealing, fundamentally changes the motion characteristic and the power characteristic of the oil pumping unit, achieves dynamic coordination of the oil pumping unit, the sucker rod and the oil well pump, and achieves dynamic coordination of a rod pumping system and an oil well liquid supply system. The pumping unit uses the frequency converter, which can improve work efficiency, increase oil production, save electric energy and protect motor and equipment.
Description
Technical field
The present invention relates to a kind of RHVC, specifically, is a kind of oil field special converter for pumping unit.
Background technology
The oil field overwhelming majority of China will press oil to go into well by water filling, by oil pumper oil is elevated from the stratum.Changing oil, change oil with electricity with water is the present situation in present China oil field.How to improve oil recovery efficiency, reduce the liquid energy expenditure per ton of extraction liquid, improve output, make the parameter of oil pumper better adapt to ground, underground operating mode, it is more convenient that on-the-spot oil pumper is regulated, and becomes insider's focus.
At present, in oil-field oil pumper equipment, beam pumping unit is easy to use, reliable, is recover the oil capital equipment in producing of present oil field, uses the most generally, and quantity is also maximum.The course of work of beam pumping unit is: use the driven by motor reductor, reductor drives belt pulley, belt pulley drives two very heavy steel slide blocks and does the rotation reciprocating motion, rely on the effect of lever, sucker rod put on put down, enter in the oil pipeline or in the oil storage tank, finish oil pumping process and take oil out of ground.
The load of pumping-unit motor is an one-period property pulsating load, and superposition has the impact of moment.In order to reduce the fluctuation of oil pumper up-down stroke load, be typically equipped with balance weight.In order to guarantee enough big detent torque, load factor was very low when pumping-unit motor normally moved, and generally all was in underload rate operation, and the reality of 45KW is hard just about 30KW, and caused power factor low, and relatively also efficient is low, and waste of energy is big.
Therefore, when design apolegamy pumping-unit motor, general way is to make its extraction amount greater than actual load.The new problem that it brings is when the oil pumper discharge capacity is superfluous, idle extraction can appear in the operation of oil pumper, occurs that sky is taken out or the pump dummy status, and superfluous oil pumping ability makes the idle extraction time of oil pumper increase, cause the grid electricity fee cost of oil mining high, energy waste is very serious.Therefore, the energy-saving potential of oil pumper is very huge.
Energy-conservationly comprise two aspects: (1) is considered from motor itself, is improved the load factor and the efficient of motor; Consider from system that (2) mechanical property of using the frequency converter motor instead reaches preferably machine, bar, pump whole system and cooperates, and improves system effectiveness.
(3) also can objectively save a part of energy from the stealing aspect, that is to say that the power supply family of output from direct current supply to the frequency conversion can't use.Both compare, and the latter's energy-saving potential is more much bigger than the former.Use variable-frequency control technique and not only make machine, bar, pump whole system reach cooperation preferably on beam pumping unit, automaticity improves, and reduces working strength of workers, reduce workload, and energy-saving effect is obvious, and comprehensive benefit is remarkable.
Summary of the invention
Technical problem to be solved by this invention is: a kind of oil field special converter for pumping unit is provided, can changes the stroke frequency of oil pumper according to the actual conditions of oil well, reach the smooth transition between upper and lower stroke.In order to overcome the deficiency of above-mentioned prior art.
The present invention has adopted following technical scheme.
A kind of special converter for pumping unit, mainly comprise current rectifying and wave filtering circuit, CPU, the IGBT module, filter circuit, feedback circuit and just profound ripple filter circuit is characterized in that: some trigger electrodes that are connected with CPU connect feedback circuit by the protection diode respectively, and trigger electrode also connects motor by filter circuit; Feedback circuit connects electrical network by just profound ripple filter circuit; Current rectifying and wave filtering circuit connects the IGBT module by current-limiting resistance, power supply electric wire connecting junction.
Very 12 of described triggerings.
Also be connected with DC filter between power supply electric wire connecting junction and the IGBT module.
Described IGBT module is in parallel three groups.
Good effect of the present invention is: have the advantages that long-range direct current supply reduces line loss and stealing.Particularity and field work characteristics at oil pumper load, braking circuit is changed into feedback circuit, can feed back to electrical network falling electricity, thereby realize that power savings can make the frequency converter reliably working again, regenerative electric energy feedback electrical network 97% effectively reduces energy resource consumption.
According to oil pumper is the characteristics of alternation load, can change the stroke frequency of oil pumper according to the actual conditions of oil well, reaches the smooth transition between upper and lower stroke.Frequency converter itself has required various defencive functions of oil pumper and corresponding discharge feedback circuit, and blower fan can have temperature to control automatically, has prolonged the useful life of blower fan, also saves corresponding energy resource consumption.
Can be according to the down-hole feed flow, adjust rotating speed arbitrarily and improve pump coefficient of fullness and discharge coefficient, reach the effect of energy-conservation, volume increase, stepless speed regulation.
Adopt the speed of the stroke frequency stroke of frequency adjustment oil pumper, reach the purpose that economize on electricity is increased production again.
Can dynamically adjust the rotating speed of oil pumper, but step-less adjustment oil pumper jig frequency, thus the degree of filling of adjustment pump improves extraction efficiency, increases crude output, has reduced power of motor, has realized energy-conservation purpose.
Owing to adopt variable-frequency control technique, the power supply of output different frequency, thus make the motor stroke rotating speed can soon can be slow, but step-less adjustment oil pumper stroke speed ratio.Can improve the degree of filling of crude oil at pump; And suitably raise the efficiency, then can reduce the leakage factor in lifting process, improve the crude output in the unit interval effectively.
The result of use aspect, owing to special converter is controlled oil pumper, more traditional oil pumper, superiority is embodied in the following aspects:
(1) oil pumper is carried out soft start, starting current reduces significantly, has avoided motor, decelerator and oil pumper are produced excessive mechanical shock, has prolonged the useful life of equipment.
(2) improved the power of electric motor factor, power factor rises to 0.98 by original 0.3～0.5.
(3) highly versatile.Can satisfy the requirement of different oil well various working.According to the actual supply capability of oil well, dynamically adjust the frequency of oil pumper, both reached energy-conservation purpose, improved crude output again.
(4) frequency converter has multinomial defencive functions such as overvoltage, under-voltage, overload, short circuit, phase shortage and stall, the more accurate motor of having protected reliably.
(5) can be at the stroke of step-less adjustment oil pumper in the effective adjustable range.
(6) simple to operation.All parameter regulation all can be set by panel, and the user is easy to grasp, and is more directly perceived than the operation of universal frequency converter.
Description of drawings
Fig. 1 is a main circuit schematic diagram of the present invention.
Fig. 2 is after cable is exported to the schematic diagram of electrical appliance through transformer output rectification.
Embodiment
Among Fig. 1,12 trigger electrodes that are connected with CPU2 respectively are by protection diode D
7-D
8Connect feedback circuit 6, trigger electrode also connects motor 5 by filter circuit 4; Feedback circuit 6 connects electrical network by just profound ripple filter circuit 7; Current rectifying and wave filtering circuit 1 is by current-limiting resistance, power supply electric wire connecting junction and DC filter L
1Connect three groups of IGBT modules 3 in parallel.
The CPU2 that this frequency converter adopts is M37906, this microprocessor is Mitsubishi the 4th a generation threephase asynchronous special chip, adopt high-performance Si-gate CMOS technology, have 42 pin frostings stickups (SSOP) and 42 pin and mould two kinds of packing forms of narrow pin dual-in-line (SDIP), FLASH chip and mask rom chip dual mode are provided, and its basic characteristics are the strong working stabilities of anti-tampering ability.
Form current rectifying and wave filtering circuit 1 by D1-D6 and IC, as the bussed supply of direct current.Be distributed to each direct current power unit Q1-Q6 workmanship through OUT+ and OUT-.Form feedback circuit 6 by Q7-Q12, and be feedback unit.Form just profound ripple filter circuit 7 by L2 and C.R.S.T is power-frequency voltage 380V input.CPU2 is the core bit frequency control of Q1-Q12.R is that current-limiting resistance is protected IGBT module 3 simultaneously.K is the bussed supply contactor.M is a motor 5.
Behind current rectifying and wave filtering circuit 1 rectifying and wave-filtering, connect DC filter L
1With IGBT module 3, export filter circuit 4 to, export to motor 5 after wave circuit 4 filtering after filtration.
Again through protection diode D
7-D is input to feedback circuit 6, feeds back to the purpose that electrical network reaches economize on electricity thereby principle is the electric energy that produces behind stall of motor by feedback circuit 6 and just profound ripple filter circuit 7.Just profound ripple filter circuit 7 is harmonic filtration, and purpose is for fear of polluting electrical network, feed back to electrical network under the situation that makes frequency and synchronized under the control of CPU2. also detect overvoltage, under-voltage, overcurrent, overload simultaneously and implement protection.
As shown in Figure 2, export the D rectification after cable is exported to ten road electrical appliances through transformer T.
For the reliability that guarantees to produce, various field produces machineries all leave certain surplus capacity when using power drive.Motor can not move under full load, except that reaching the power drive requirement, unnecessary moment has increased the consumption of active power, cause waste of electric energy, it is to be in generating state that time of 1/4th is arranged when running of oil extractor in oil field, this frequency converter can feed back to electrical network to electricity, at this moment another is in and uses electricity condition, ten can be 20 percent with the state work power saving rate at this moment of complementation. for the efficient that reaches oil pumping can reduce frequency, because much be that sky is taken out under rated speed, so, when motor speed when N1 changes to N2, the variation relation of its motor shaft power (P) is as follows: P2/P1=(N2/N1) 3 this shows and reduces the energy-saving effect that motor speed can obtain cube level.
Dynamically adjust energy-conservation: adapt to load change rapidly, supply with maximal efficiency voltage.Variable-frequency governor is provided with 5000 times/second observing and controlling output function on software, remain the output high-efficiency operation of motor.
V/F function economize on electricity by frequency conversion self: under the situation that guarantees the motor output torque, can regulate the V/F curve automatically.Reduce the output torque of motor, reduce input current, reach power save mode.
Frequency conversion carries soft start energy-saving: when the motor full voltage starting, because the staring torque of motor needs, and absorb seven times motor rated current from electrical network, and excessive starting current is promptly wasted electric power, voltage fluctuation infringement to electrical network is also very big, has increased line loss and loss on transmission.After adopting soft start, starting current can reduce the impact of starting current to electrical network from 0--motor rated current, has saved electric energy, has also reduced to start the rotating speed impact of inertia to the big inertia of equipment, has prolonged the useful life of equipment.
It is energy-conservation to improve power factor: motor produces moment by stator winding and rotor winding by electromagnetic action.Winding is owing to its induction reactance effect, and for electrical network, impedance operator is perception, and motor absorbs a large amount of reactive powers when operation, cause power factor very low.After adopting the present invention, because its performance becomes: AC--DC--AC, behind rectifying and wave-filtering, variation has taken place in load characteristic.Variable-frequency governor is resistive to the impedance operator of electrical network, and power factor is very high, has reduced reactive loss.
Claims (4)
1, a kind of special converter for pumping unit, mainly comprise current rectifying and wave filtering circuit (1), CPU (2), IGBT module (3), filter circuit (4), feedback circuit (6) and just profound ripple filter circuit (7) is characterized in that: some trigger electrodes that are connected with CPU (2) connect feedback circuit (6) by the protection diode respectively, and trigger electrode also connects motor (5) by filter circuit (4); Feedback circuit (6) connects electrical network by just profound ripple filter circuit (7); Current rectifying and wave filtering circuit (1) connects IGBT module (3) by current-limiting resistance, power supply electric wire connecting junction.
2, special converter for pumping unit as claimed in claim 1 is characterized in that: very 12 of described triggerings.
3, special converter for pumping unit as claimed in claim 1 or 2 is characterized in that: also be connected with DC filter between power supply electric wire connecting junction and the IGBT module (3).
4, special converter for pumping unit as claimed in claim 1 or 2 is characterized in that: described IGBT module (3) is three groups of parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710013268 CN101013880A (en) | 2007-01-22 | 2007-01-22 | Special frequency converter for oil pumping unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710013268 CN101013880A (en) | 2007-01-22 | 2007-01-22 | Special frequency converter for oil pumping unit |
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| Publication Number | Publication Date |
|---|---|
| CN101013880A true CN101013880A (en) | 2007-08-08 |
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|---|---|---|---|
| CN 200710013268 Pending CN101013880A (en) | 2007-01-22 | 2007-01-22 | Special frequency converter for oil pumping unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678594A (en) * | 2012-05-11 | 2012-09-19 | 常州新德冷机有限公司 | Outdoor modularization fan of air-conditioner |
| CN102720683A (en) * | 2012-05-11 | 2012-10-10 | 常州新德冷机有限公司 | Air conditioner indoor modularization fan |
| CN105140889A (en) * | 2015-09-14 | 2015-12-09 | 江苏物联网研究发展中心 | Inverter over-current protection circuit |
| CN110943674A (en) * | 2019-12-25 | 2020-03-31 | 北京达睿企科技有限公司 | Rectifier and low-voltage inverter array power supply system |
-
2007
- 2007-01-22 CN CN 200710013268 patent/CN101013880A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678594A (en) * | 2012-05-11 | 2012-09-19 | 常州新德冷机有限公司 | Outdoor modularization fan of air-conditioner |
| CN102720683A (en) * | 2012-05-11 | 2012-10-10 | 常州新德冷机有限公司 | Air conditioner indoor modularization fan |
| CN105140889A (en) * | 2015-09-14 | 2015-12-09 | 江苏物联网研究发展中心 | Inverter over-current protection circuit |
| CN105140889B (en) * | 2015-09-14 | 2018-03-30 | 江苏物联网研究发展中心 | Inverter over-current protection circuit |
| CN110943674A (en) * | 2019-12-25 | 2020-03-31 | 北京达睿企科技有限公司 | Rectifier and low-voltage inverter array power supply system |
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