CN2819642Y - Constant-power controller of beam oil sucker - Google Patents
Constant-power controller of beam oil sucker Download PDFInfo
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- CN2819642Y CN2819642Y CNU2005200215796U CN200520021579U CN2819642Y CN 2819642 Y CN2819642 Y CN 2819642Y CN U2005200215796 U CNU2005200215796 U CN U2005200215796U CN 200520021579 U CN200520021579 U CN 200520021579U CN 2819642 Y CN2819642 Y CN 2819642Y
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Abstract
The utility model relates to a constant power controller of a moving beam oil pumping machine. The utility model comprises a constant power control module 1, a voltage detecting module 2, a current detecting module 3, a keyboard input module 4, a display 5, a frequency changer 6 and an asynchronous motor 7. According to the problem that a big horse draws a small carriage universally existing in a moving beam oil pumping machine system at present, the utility model controls the power of the oil pumping machine system in a closed loop control mode, which leads the operational characteristic of the moving beam oil pumping machine system to be soft, inhibits the fluctuation of the power of the system and decreases the impulse from the load pf the electric machine for an electric network. When the utility model is used, the output of an oil field can not be influenced, the model selection capacity of the electric machine used for the drag of the moving beam oil pumping machine is lowered, the work efficiency is enhanced and the energy is saved. The utility model has the characteristics that the disposable investment of the utility model is little; when the utility model is used for a long time, the economic benefit is obvious; the cost performance ratio is high.
Description
Technical field
The utility model relates to a kind of beam pumping unit constant power control device.This device makes the pumping unit system operating characteristic become soft, to be implemented in the type selecting capacity that reduces asynchronous machine under the prerequisite that does not influence field output, improves the asynchronous machine operating efficiency.On the other hand, two kinds of operating states of asynchronous machine are unified to consider, its generating state is held time shorten as far as possible, reduce even eliminate the ohmically power consumption of release of dynamic braking unit in the frequency converter, with energy savings.
Background technology
In present oil exploitation, extensively adopt beam pumping unit.This oil pumper is a periodically variable load of a kind of big inertia, cause in the process of a stroke of beam pumping unit operation, asynchronous machine power output excursion is very big, and average power is less relatively, in order to satisfy the needs of this certain loads, when selecting capacity motor, need be principle to satisfy the oil pumper maximum power requirement, make and pumping unit system ubiquity low load with strong power phenomenon cause the pumping unit system operational efficiency low, increased system cost simultaneously.And with energy can only unidirectional delivery the traditional frequency conversion device as the control device of asynchronous machine, a large amount of regenerated energy consumption cause energy waste on brake resistance.
Summary of the invention
For solving the problems of the technologies described above, a kind of beam pumping unit constant power control device is provided, in conjunction with the asynchronous machine operating characteristic, by analyzing the particularity of beam pumping unit as load, the arteface oil pumper is at the characteristic working curve of different strokes, adjust motor speed by online in real time, make power curve compress to average power content as far as possible, reduce the power fluctuation in the pumping unit system running, make the operation characteristic of pumping unit system become soft, thereby can reduce asynchronous machine type selecting capacity, improve system works efficient; On the other hand, two kinds of operating states of asynchronous machine are unified to consider that its generating state is held time shorten as far as possible, reduction even elimination discharge ohmically power consumption, with energy savings, bring remarkable economic efficiency.
For the scheme that realizes the utility model purpose is: a kind of beam pumping unit constant power control device, its composition comprises: permanent power control module 1, voltage detection module 2, current detection module 3, keyboard input module 4, display 5, frequency converter 6 and asynchronous machine 7.It is characterized in that: the input of voltage detection module 2 is in parallel with the device incoming line, the input of current detection module 3 and the power input line of device are in series, the output of the two links to each other with the joint Terminal J2 of permanent power control module 1, is used for the detection signal of input voltage, electric current; Keyboard input module 4, display 5 link to each other by joint Terminal J1 with permanent power control module 1, are used to respond corresponding button operation, and show electric weight; Permanent power control module 1 links to each other with frequency converter 6, the digital quantity of tach signal is converted into analog quantity after, send frequency converter to, drive asynchronous machine 7 and rotate; Permanent power control module 1, voltage detection module 2, current detection module 3, keyboard input module 4, display 5, be installed in the same casing with frequency converter 6.
Permanent power control module 1 comprises microprocessor IC7, latch IC8, program storage IC10, decoding circuit IC9, D/A change-over circuit IC11, IC12A and crystal oscillator X1.Microprocessor IC7 links to each other through latch IC8 with program storage IC10, realizes the time-sharing multiplex of data/address bus and program bus; Crystal oscillator X1 links to each other with microprocessor IC7, for it provides clock; Decoding circuit IC9 one end links to each other with microprocessor IC7, and the other end links to each other with program storage IC10, also has an end to link to each other with the Enable Pin of D/A conversion chip IC11.
In dc bus both positive and negative polarity dynamic braking in parallel unit to discharge regenerated energy; Comprise power model, energy consumption resistance and voltage control circuit; Power model be connected in parallel on the dc bus after energy consumption resistance is connected.Voltage control circuit is by detecting DC bus-bar voltage, power controlling module switch.
The operation principle of beam pumping unit constant power control device is: voltage detection module 2, current detection module 3 links to each other with microprocessor IC7 in the permanent power control module 1, by the A/D change-over circuit among the microprocessor IC7 with voltage, the effective value of electric current is converted to digital quantity, obtain the instantaneous power of pumping unit system again by computed in software, obtain the given signal of motor speed of this moment again by FUZZY ALGORITHMS FOR CONTROL according to the difference of instantaneous power and artificial characteristic expectation power, by the D/A conversion chip digital quantity is converted to analog quantity, send frequency converter to, drive the asynchronous machine operation.DC link at frequency converter is connected to the dynamic braking unit, comprises power model IGBT and energy consumption resistance and voltage control circuit.Fluctuation according to DC bus-bar voltage judges whether to produce regenerated energy.When DC bus-bar voltage during greater than a certain threshold value, open power model, the energy of asynchronous machine feedback is discharged by energy consumption resistance, and in DC bus-bar voltage during less than this threshold value, think that asynchronous machine is in motoring condition, no regenerated energy produces, and closes power model.In order to prevent oscillatory occurences near threshold value, to occur, produce high-frequency switching signal and damage power model, hardware circuit adopts the ring control mode that stagnates.
The advantage that the utility model had: this device is reduced to original about 80% with the type selecting capacity of asynchronous machine under the prerequisite that does not influence field output.On the other hand, the asynchronous machine generating state is held time shorten as far as possible, reduce regenerated energy, reduce even the ohmically power consumption of elimination release, this control mode is compared with the traditional frequency conversion device, energy-conservation reaching about 20%.All bringing remarkable economic efficiency aspect equipment one-time investment and the continuation use.
Description of drawings
Fig. 1 is a beam pumping unit constant power control device entire block diagram.
Fig. 2 is the pumping unit system power.
Fig. 3 is the pumping unit system power of manual construction.
Fig. 4 is the circuit theory diagrams of the voltage detection module of embodiment.
Fig. 5 is the circuit theory diagrams of the current detection module of embodiment.
Fig. 6 is the circuit theory diagrams of the permanent power control module of embodiment.
Embodiment
At frequency converter during with a certain constant speed instruction operation, the power curve of whole pumping unit system as shown in Figure 2, figure can find out thus, in the process of a stroke of oil pumper operation, asynchronous machine power output excursion is very big, and average power is less relatively, and wherein negative power is the regenerated energy that asynchronous machine produces.If by manual construction power characteristic Fig. 3, and employing FUZZY ALGORITHMS FOR CONTROL, according to the online adjustment rotating speed of loading condition, promptly when load is big, suitably reduce rotating speed, and hour suitably improve a rotating speed in load, make the real work curve of oil pumper level off to artificial characteristic working curve as far as possible, can realize the permanent power control of pumping unit system.Be elaborated below.
The closed-loop control of power
(1). power calculation
Because be to simplify software pumping unit system stroke time much larger than electricity cycle time, here with the average power in an electric cycle instantaneous power as pumping unit system.
The expression formula of instantaneous power is
p＝3UIcos 1
Wherein U is the voltage effective value in an electric cycle.I is the current effective value in an electric cycle, and cos is a power factor.
Hardware circuit is mainly realized the conversion of signals of voltage, electric current, adopts linear hall sensor as detecting element.The voltage that collects, current signal carry out effective value on the one hand the real effective chip and calculate, and give the zero passage comparison circuit to obtain synchronizing signal on the other hand.With these signal input microprocessors IC7, by the A/D modular converter among the microprocessor IC7 aanalogvoltage is converted into digital quantity, finish the calculating of instantaneous power again according to formula 1 by software, dual mean value algorithm is adopted in the calculating of average power, promptly calculate the mean value of a stroke instantaneous power earlier, the power average value with a plurality of strokes averages again.
(2). construct artificial characteristic working curve
Earlier the beam pumping unit constant power control device is operated in the frequency converter state, be that power ring is inoperative, be equivalent to a traditional frequency conversion device, with 50 parts of branches such as 0-50 hertz frequency scope, on 50 Frequency points, work long hours respectively, and write down the average power of each Frequency point, can obtain artificial characteristic curve.
(3). the FUZZY ALGORITHMS FOR CONTROL of power
At the pumping unit system characteristics and the controlled function that will realize, adopt FUZZY ALGORITHMS FOR CONTROL, according to sampled data and fuzzy expert database, obtained fine control performance.Here with the instantaneous power of pumping unit system as input variable, the average power under a certain rotating speed is as specified rate, and rotational speed output signal is as output variable.Algorithm calculates in real time to instantaneous power, when instantaneous power during greater than average power, suitably reduces rotational speed setup, to reduce system power; When instantaneous power during less than average power, suitably improve rotational speed setup, compensation will reduce the loss of time that rotating speed causes because of instantaneous power during greater than average power on the one hand, can effectively reduce the regenerated energy that asynchronous machine produces on the other hand.
(4). the closed-loop control of power
Power closed-loop control unit at first will obtain the manual working characteristic curve.After system brings into operation, at first detected voltage, current effective value signal are carried out the A/D conversion, obtain the system power factor by synchronizing signal again, obtain instantaneous power as calculated according to formula 1.Look into the manual working characteristic curve by the rotational speed setup signal again and get average power, get adjusted tach signal by fuzzy algorithmic approach at last, send frequency converter to after being converted to analog quantity by the D/A change-over circuit.
Frequency converter is introduced
Frequency converter is the electric energy conversion links of beam pumping unit constant power control device, utilizes a slice dsp chip to adopt totally digitilized mode to realize the Frequency Drive Control of asynchronous machine.Dsp chip at first receives the tach signal that is sent by permanent power control module, mode with VVVF is calculated as required space vector of voltage amplitude and the phase angle of realization SVPWM, again by each space voltage vector of SVPWM algorithm computation action time, obtain the switching signal of IPM Intelligent Power Module, at last switching signal is exported to IPM intelligent power driver module, driven the asynchronous machine operation.
DC link at frequency converter is connected to the dynamic braking unit, comprises power model IGBT and energy consumption resistance and voltage control circuit.Function realizes need not the microprocessor intervention, is all finished by hardware circuit.Fluctuation according to DC bus-bar voltage judges whether to produce regenerated energy.When DC bus-bar voltage during greater than a certain preset threshold, open power model, the energy of asynchronous machine feedback is discharged by energy consumption resistance, and in DC bus-bar voltage during less than this threshold value, think that asynchronous machine is in motoring condition, no regenerated energy produces, and closes power model.To produce high-frequency switching signal in order preventing near preset threshold, reforming phenomena to occur and to damage power model, adopt the ring control mode that stagnates.
The processing of regenerated energy
Negative power among Fig. 2 is the regenerated energy that produces when oil pumper drives the asynchronous machine rotation, and the process that produces negative power belongs to the process of instantaneous power less than average power, by as can be known aforementioned, in instantaneous power during less than average power, device can promote the asynchronous machine rotating speed automatically, therefore, compensation will reduce the loss of time that rotating speed causes during greater than average power because of instantaneous power when, also reduced regenerated energy, and the brake unit that this device has can consume the regenerated energy that produces rapidly, this processing mode is compared with the traditional frequency conversion device, energy-conservation reaching about 20%, and energy-saving effect is remarkable.
Below be the embodiment that the inventor provides.
As shown in Figure 4, voltage detection module 2 comprises dropping resistor R1, linear hall sensor, sampling resistor RV, emitter follower IC1A, real effective counting circuit IC2 and zero passage comparison circuit IC3A.Line voltage links to each other with the linear hall sensor input through dropping resistor R1, the linear hall sensor output is in parallel with sampling resistor RV, in parallel through emitter follower IC1A with the input of real effective computing chip IC2 input, zero passage comparison circuit IC3A, to obtain voltage detection signal, the effective value that carries out voltage calculates and produces the synchronizing signal of voltage.The real effective counting circuit comprises special-purpose real effective chip IC 2 and is used to set up the capacitor C V in sampling time.This circuit uses very simple, only needs the input voltage periodic signal, can obtain the effective value of this signal in real time through one-period.The zero passage comparison circuit is made up of comparator IC3A and resistance R V1, RV2, RV3, the voltage cycle signal was passed through zero balancing can obtain square-wave signal with voltage cycle signal same phase.
As shown in Figure 5, current detection module 3 comprises linear hall sensor, sampling resistor RI, emitter follower IC4A, real effective counting circuit IC5 and zero passage comparison circuit IC6A.The electrical network incoming line is connected with the linear hall sensor input, the linear hall sensor output is in parallel with the input of real effective computing chip IC5 input, zero passage comparison circuit IC6A through emitter follower IC4A with sampling resistor RI, to obtain current detection signal, the effective value that carries out electric current calculates and produces the synchronizing signal of electric current.The real effective counting circuit comprises special-purpose real effective chip IC 5 and is used to set up the capacitor C I in sampling time.This circuit uses very simple, only needs the input current periodic signal, can obtain the effective value of this signal in real time through one-period.The zero passage comparison circuit is made up of comparator IC6A and resistance R I1, RI2, RI3, and the current cycle signal can be obtained square-wave signal with current cycle signal same phase by the zero passage comparison circuit.
Fig. 6 is permanent power control module circuit theory diagrams.Permanent power control module 1 comprises microprocessor IC7, decoding circuit IC9, program storage IC10, latch IC8, D/A change-over circuit and crystal oscillator X1.The D/A change-over circuit comprises D/A conversion chip IC11 and operational amplifier IC12A.Microprocessor IC7 links to each other through latch IC8 with program storage IC10, realizes the time-sharing multiplex of data/address bus and program bus; Crystal oscillator X1 links to each other with microprocessor IC7, for it provides clock; Decoding circuit IC9 one end links to each other with microprocessor IC7, and the other end links to each other with program storage 9, also has an end to link to each other with the Enable Pin of D/A conversion chip IC11.Joint Terminal J2 is used for and being connected of voltage detection module, current detection module, and J1 is used to connect keyboard and display.J3 is used for linking to each other with the signal input part of frequency converter.When pressing the operation key, microprocessor IC7 elder generation receives voltage detection signal, and conversion is translated into digital quantity through A/D, and then received current detection signal, and process A/D conversion is translated into digital quantity.Voltage, current synchronous signal are received two hsi ports of microprocessor IC7 respectively, according to the jumping of two signals along interval time rated output factor, obtain instantaneous power according to formula 1 by computed in software, obtain the rotational speed setup signal of this moment again by FUZZY ALGORITHMS FOR CONTROL, be converted to analog quantity through the D/A change-over circuit, send frequency converter to and drive asynchronous machine work.Frequency converter at first receives the tach signal that is sent by permanent power control module, mode with VVVF is calculated as required space vector of voltage amplitude and the phase angle of realization SVPWM, again by each space voltage vector of SVPWM algorithm computation action time, obtain signal switching time, at last with switching time signal export to IPM intelligent power driver module, drive the asynchronous machine operation.DC link at frequency converter is connected to the dynamic braking unit, comprises power model IGBT, energy consumption resistance and voltage control circuit.Function realizes need not the microprocessor intervention, is all finished by hardware circuit.Fluctuation according to DC bus-bar voltage judges whether to produce regenerated energy.When DC bus-bar voltage during greater than a certain preset threshold, open power model, the energy of asynchronous machine feedback is discharged by energy consumption resistance, and in DC bus-bar voltage during less than this threshold value, think that asynchronous machine is in motoring condition, no regenerated energy produces, and closes power model.To produce high-frequency switching signal in order preventing near threshold value, reforming phenomena to occur and to damage power model, adopt the ring control mode that stagnates.
Claims (5)
1. beam pumping unit constant power control device, its composition comprises: permanent power control module (1), voltage detection module (2), current detection module (3), keyboard input module (4), display (5), frequency converter (6) and asynchronous machine (7); It is characterized in that: the input of voltage detection module (2), current detection module (3) links to each other with beam pumping unit constant power control device input, output links to each other with the joint Terminal J2 of permanent power control module (1), is used for the detection signal of input voltage, electric current; Permanent power control module (1) links to each other by joint Terminal J1 with keyboard input module (4), display (5), is used to respond corresponding button operation, and electric weight shows; Permanent power control module (1) links to each other with the signal input part of frequency converter (6), the digital quantity of tach signal is converted into analog quantity after, send frequency converter to, drive asynchronous machine (7) rotates; Permanent power control module (1), voltage detection module (2), current detection module (3), keyboard input module (4), display (5) are installed in the same casing with frequency converter (6).
2. a kind of beam pumping unit constant power control device related as claim 1 is characterized in that: voltage detection module (2) comprises dropping resistor R1, linear hall sensor, sampling resistor RV, emitter follower IC1A, real effective counting circuit IC2 and zero passage comparison circuit IC3A; Line voltage links to each other with the linear hall sensor input through dropping resistor R1, the linear hall sensor output is in parallel with sampling resistor RV, in parallel through emitter follower IC1A with the input of real effective computing chip IC2 input, zero passage comparison circuit IC3A, to obtain voltage detection signal, the effective value that carries out voltage calculates and produces the synchronizing signal of voltage.
3. a kind of beam pumping unit constant power control device related as claim 1 is characterized in that: current detection module (3) comprises linear hall sensor, sampling resistor RI, emitter follower IC4A, real effective counting circuit IC5 and zero passage comparison circuit IC6A; The electrical network incoming line is connected with the linear hall sensor input, the linear hall sensor output is in parallel with the input of real effective computing chip IC5 input, zero passage comparison circuit IC6A through emitter follower IC4A with sampling resistor RI, to obtain current detection signal, the effective value that carries out electric current calculates and produces the synchronizing signal of electric current.
4. a kind of beam pumping unit constant power control device related as claim 1, it is characterized in that: permanent power control module (1) comprises microprocessor IC7, latch IC8, program storage IC10, decoding circuit IC9, D/A change-over circuit IC11, IC12A and crystal oscillator X1; Microprocessor IC7 links to each other through latch IC8 with program storage IC10, realizes the time-sharing multiplex of data/address bus and program bus; Crystal oscillator X1 links to each other with microprocessor IC7, for it provides clock; Decoding circuit IC9 one end links to each other with microprocessor IC7, and the other end links to each other with program storage IC10, also has an end to link to each other with the Enable Pin of D/A conversion chip (IC11).
5. a kind of beam pumping unit constant power control device related as claim 1 is characterized in that: in the dc bus both positive and negative polarity of frequency converter dynamic braking in parallel unit to discharge regenerated energy; Comprise power model, energy consumption resistance and voltage control circuit; Power model be connected in parallel on the dc bus after energy consumption resistance is connected; Voltage control circuit is by detecting DC bus-bar voltage, power controlling module switch.
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| CNU2005200215796U CN2819642Y (en) | 2005-09-07 | 2005-09-07 | Constant-power controller of beam oil sucker |
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| CNU2005200215796U CN2819642Y (en) | 2005-09-07 | 2005-09-07 | Constant-power controller of beam oil sucker |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101753076A (en) * | 2008-12-01 | 2010-06-23 | 马维尔国际贸易有限公司 | Motor speed control system and method without pulse-width modulation |
| CN102495275A (en) * | 2011-12-20 | 2012-06-13 | 中冶南方（武汉）自动化有限公司 | High-precision current detection circuit based on CPU (Central Processing Unit) |
| CN102545775A (en) * | 2012-01-17 | 2012-07-04 | 上海交通大学 | Oil pumping unit frequency conversion control method based on unit stroke energy |
| CN105298469A (en) * | 2015-10-20 | 2016-02-03 | 北京恒和兴业科技发展有限公司 | Monitoring system and monitoring method for running state of beam-pumping unit |
| CN105958897A (en) * | 2016-05-31 | 2016-09-21 | 海南双猴科技有限公司 | Motor power self-balance system and method |
| CN106917611A (en) * | 2015-12-24 | 2017-07-04 | 中国石油天然气股份有限公司 | Constant power control method and device for oil pumping unit |
| CN107983525A (en) * | 2017-12-04 | 2018-05-04 | 徐工集团工程机械有限公司 | Control method, dynamical system and the jaw crusher of dynamical system |
| CN108565837A (en) * | 2018-04-20 | 2018-09-21 | 河南森尼瑞电气有限公司 | A kind of disconnected bar guard method and motor protector |
| CN108880396A (en) * | 2017-05-12 | 2018-11-23 | 中国石油化工股份有限公司 | Pumping unit flexible control method and system |
| CN112211812A (en) * | 2020-09-11 | 2021-01-12 | 中国石油天然气股份有限公司 | Method for constant-power variable-speed operation of beam-pumping unit |
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2005
- 2005-09-07 CN CNU2005200215796U patent/CN2819642Y/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101753076A (en) * | 2008-12-01 | 2010-06-23 | 马维尔国际贸易有限公司 | Motor speed control system and method without pulse-width modulation |
| CN101753076B (en) * | 2008-12-01 | 2014-07-02 | 马维尔国际贸易有限公司 | Motor speed control system and method without pulse-width modulation |
| CN102495275A (en) * | 2011-12-20 | 2012-06-13 | 中冶南方（武汉）自动化有限公司 | High-precision current detection circuit based on CPU (Central Processing Unit) |
| CN102495275B (en) * | 2011-12-20 | 2014-10-29 | 中冶南方（武汉）自动化有限公司 | High-precision current detection circuit based on CPU (Central Processing Unit) |
| CN102545775A (en) * | 2012-01-17 | 2012-07-04 | 上海交通大学 | Oil pumping unit frequency conversion control method based on unit stroke energy |
| CN102545775B (en) * | 2012-01-17 | 2014-04-16 | 上海交通大学 | Oil pumping unit frequency conversion control method based on unit stroke energy |
| CN105298469A (en) * | 2015-10-20 | 2016-02-03 | 北京恒和兴业科技发展有限公司 | Monitoring system and monitoring method for running state of beam-pumping unit |
| CN106917611A (en) * | 2015-12-24 | 2017-07-04 | 中国石油天然气股份有限公司 | Constant power control method and device for oil pumping unit |
| CN106917611B (en) * | 2015-12-24 | 2020-01-07 | 中国石油天然气股份有限公司 | Constant power control method and device for oil pumping unit |
| CN105958897A (en) * | 2016-05-31 | 2016-09-21 | 海南双猴科技有限公司 | Motor power self-balance system and method |
| CN108880396A (en) * | 2017-05-12 | 2018-11-23 | 中国石油化工股份有限公司 | Pumping unit flexible control method and system |
| CN107983525A (en) * | 2017-12-04 | 2018-05-04 | 徐工集团工程机械有限公司 | Control method, dynamical system and the jaw crusher of dynamical system |
| CN108565837A (en) * | 2018-04-20 | 2018-09-21 | 河南森尼瑞电气有限公司 | A kind of disconnected bar guard method and motor protector |
| CN112211812A (en) * | 2020-09-11 | 2021-01-12 | 中国石油天然气股份有限公司 | Method for constant-power variable-speed operation of beam-pumping unit |
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