CN103427729A - Rod pumped well group control system based on direct current bus - Google Patents
Rod pumped well group control system based on direct current bus Download PDFInfo
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Abstract
The invention provides a rod pumped well group control system based on a direct current bus. The rod pumped well group control system based on the direct current bus comprises a transformer, a rectification filter device and a plurality of inverter terminal controllers. The transformer reduces a high-voltage power source to a 380V or middle-high voltage three-phase alternating-current power source, the rectification filter device transforms the three-phase alternating-current power source to direct current electric energy, the inverter terminal controllers transform the direct current electric energy to alternating current electric energy and supply the alternating current electric energy for multiple pumping units, and real-time monitoring and control are carried out on the running conditions of the inverter terminal controllers. The rod pumped well group control system based on the direct current bus solves the problems that existing equipment is poor in power, high in cost and the like, and has the advantages of being high in energy-saving efficiency, low in cost and capable of preventing the sharp fluctuation or overvoltage of the voltage of the direct current bus and achieving power transmission without voltage boosting for long-distance oil wells where power is supplied to multiple wells through one system.
Description
Technical field
The present invention relates to the rod-pumped well group control system, particularly relate to a kind of rod-pumped well group control system based on DC bus.
Background technology
At present the various Detection & Controling modes of domestic relevant oil pumper and drive motors are varied, such as, take and improve technique, improve inversion speed-governing device, indicator diagram measurement analyzer, slip electric motor, pole changing that recovery ratio is equipped with as purpose as oil pumper; For oil pumper due to the problem that effect is low, power factor is low due to " low load with strong power " state for a long time, for energy-saving and cost-reducing and Energy Saving Control motor, step-down that adopt are energy-conservation and Δ/Y connection is controlled, and oil pumper is controlled to realize energy-conservation so-called energy-saving device etc. by batch (-type).Abroad around the control of oil pumper, mainly adopt fairly perfect Converse speed regulation apparatus and supporting indicator diagram measurement analyzer etc. with it, by inversion speed-governing device and multifunction control system, both the requirement of oil production technology can be met preferably, and effective energy-conservation purpose can be reached again.The inversion control cabinet of each Oilfield using has difference and the impact on technology and performance in following several respects at home: at first, as the AC-DC-AC inverter structure, the circuit structure difference of its hand over-straight rectification and filtering link, have direct impact for the size of net side power factor and on the harmonic pollution degree of electrical network.Secondly, for the SPWM control of inversion link and the algorithm difference of Regulation Control, directly affect the step-down energy-saving effect of realizing under oil pumper " low load with strong power " state.Again, the inversion control cabinet has two kinds of different processing modes and configuration configuration usually to the uneven energy regenerative of oil pumper: the one, and in the power consumption of DC side access brake resistance, circuit is simple; The 2nd, hand over-straight rectification and filtering link adopt the PWM Reversible Rectifiers by the motor feed-in of falling generated energy electrical network, and uneven energy regenerative is reclaimed, and avoid the waste of energy.Latter's technical difficulty is larger, and cost is also higher.In addition, due to adopted technological means difference, the control cubicle cost is also different, but totally it seems, the inversion control cabinet is on the high side, and each oil recovery factory is difficult to accept, and this is also the main cause that the inversion control cabinet is difficult to the large tracts of land extensive use at present.We have invented a kind of new rod-pumped well group control system based on DC bus for this reason, have solved above technical problem.
Summary of the invention
The purpose of this invention is to provide a kind of energy-saving efficiency high, can prevent fluctuating widely and overvoltage of DC bus-bar voltage, and can realize the rod-pumped well group control system based on DC bus of not boosting and transmitting electricity of remote " one drag many " oil well.
Purpose of the present invention can be achieved by the following technical measures: the rod-pumped well group control system based on DC bus, should the rod-pumped well group control system based on DC bus comprise transformer, straightening and filtering unit and a plurality of inversion terminal control unit, this transformer is reduced to 380V or mesohigh three-phase alternating-current supply by high-tension electricity, this straightening and filtering unit is converted to direct current energy by these three AC power, a plurality of inputs of the plurality of inversion terminal control unit are connected in the output of this straightening and filtering unit in parallel by common DC bus, a plurality of outputs connect respectively a plurality of oil pumpers, the plurality of inversion terminal control unit is converted to AC energy by this direct current energy, for the plurality of oil pumper provides this AC energy, and to the ruuning situation real time monitoring of this inversion terminal control unit, control.
Purpose of the present invention also can be achieved by the following technical measures:
Should the rod-pumped well group control system based on DC bus also comprise high-voltage switch gear, this high-voltage switch gear is connected in this transformer, controls the electric power break-make between high-tension cable and this transformer.
Should the rod-pumped well group control system based on DC bus also comprise air switch, this air switch connects the input of this transformer and this straightening and filtering unit, controls the electric power break-make between this transformer and this straightening and filtering unit.
This straightening and filtering unit comprises rectifier and filter, and this rectifier is converted to this direct current energy by these three AC power, and this filter is by this direct current energy filtering.
This inversion terminal control unit comprises the power converter main circuit, detection and protection module and single chip control module, the input of this power converter main circuit is connected with the output of this straightening and filtering unit, output is connected with this pumping-unit motor, it is converted to this AC energy by this direct current energy, for this pumping-unit motor provides this AC energy, and absorb the overvoltage energy on this common DC bus, this detection and protection module are connected in the test side of this power converter main circuit, its parameter to the motor of this oil pumper detects in real time, and detection signal is transferred to this single chip control module, this single chip control module receives this detection signal, and judge the operating state of this motor according to this detection signal, this AC energy provided to control this power converter main circuit.
This power converter main circuit comprises that DC bus input filter capacitor, charge protection unit, SPWM inverter and overvoltage absorb protected location; this DC bus input filter capacitor is by this direct current energy filtering; this charge protection unit absorbs the impulse current while just having powered on because of this DC bus input filter capacitor; this SPWM inverter is converted to this AC energy by this direct current energy, and this overvoltage absorbs protected location and absorbs the overvoltage energy on this common DC bus.
This detection and protection module sound and light alarm occurs under abnormal conditions automatically sending at this motor.
This 16 dsPIC30F series DSP single-chip microcomputers of single chip control module application and high-frequency PWM control mode.
This inversion terminal control unit also comprises driver module and uneven energy regenerative conservation treatment module; the input of this driver module is connected in the output of this single chip control module; the output of this driver module is connected with the control end of this power converter main circuit; to drive this power converter main circuit; and strong and weak electricity isolates to protect this power converter main circuit; this imbalance energy regenerative conservation treatment module is connected in test side and this driver module of this power converter main circuit, absorbs the overvoltage energy on this common DC bus.
When this detection and protection module detect on this common DC bus overtension; overvoltage signal is transferred to this single chip control module; this single chip control module is transferred to this driver module by this overvoltage signal, makes this imbalance energy regenerative conservation treatment module absorb the overvoltage energy on this common DC bus under the driving of this driver module.
When this imbalance energy regenerative conservation treatment module absorbs the overvoltage energy on this common DC bus, this single chip control module and this detection and protection module carry out the LED indication.
This inversion terminal control unit also comprises the running state monitoring module, and this running state monitoring module is connected in this single chip control module, and the ruuning situation of this inversion terminal control unit is carried out to real time monitoring, control.
This running state monitoring module comprises LED display window, supervisory keyboard and running state monitoring lamp, operating state and operating condition by this LED display window to this inversion terminal control unit are monitored, select and set the operational mode of this inversion terminal control unit by this supervisory keyboard, this running state monitoring lamp shows various running statuses.
This LED display window is also stored the fault message of this inversion terminal control unit.
This supervisory keyboard comprises the inversion starting terminal, stops, resetting, rotating, programming, data setting, upper and lower frequency adjustment and frequency modulation.
The rod-pumped well group control system based on DC bus in the present invention, compared with prior art, have the following advantages: 1. adopt and concentrate rectification, flat ripple reactance to add DC filtering, by DC bus powered, transformer capacity both had been conducive to reduce the current on line side harmonic pollution and had improved power factor, again can the decrease system cost;
On DC bus between each Parallel Control terminal to the compensation of the energy mutual feedback of load variations, make the energy regenerative of each oil pumper be able to fully share and recycle, improve energy saving of system efficiency;
3. in conjunction with the periodicity of oil pumper load Variation Features sharply, use the energy-saving control algolithm.By detecting present load situation and the upper and lower stroke position of oil pumper, through intelligent statistical analysis judgement, realize the optimization of upper and lower stroke frequency is regulated;
4. prevent fluctuating widely and overvoltage of DC bus-bar voltage;
5. adopt the common DC bus power supply can realize the transmission of electricity of not boosting of remote " one drag many " oil well, the direct current transmission range is longer, without line loss, and has avoided stealing electric situation generation;
6. the software development of each control cubicle terminal, realize the combination of well head data acquisition and teletransmission communication and inversion control defencive function, and Highgrade integration is integrated, and by a set of High Performance SCM hardware and software systematic unity, completed, not only reliable and stable but also reduce costs.
The accompanying drawing explanation
The structural representation that Fig. 1 is the embodiment of the present invention;
The structural representation that Fig. 2 is the inversion terminal control unit in Fig. 1;
The schematic diagram of the running state monitoring panel that Fig. 3 is the running state monitoring module in Fig. 2.
Embodiment
For above and other purpose of the present invention, feature and advantage can be become apparent, cited below particularlyly go out preferred embodiment, and coordinate appended graphicly, be described in detail below.
As shown in Figure 1, the structure chart that Fig. 1 is the rod-pumped well group control system based on DC bus of the present invention.This rod-pumped well group control system based on DC bus is by comprising high-voltage switch gear 1, transformer 2, air switch 3, straightening and filtering unit 4 and inversion terminal control unit 5.Described high-voltage switch gear 1 is connected with the input of straightening and filtering unit 4 after connection transformer 2 and air switch 3 in turn, the output of straightening and filtering unit 4 is connected with the input of inversion terminal control unit 5, and the output of inversion terminal control unit 5 is connected with oil pumper 6.Inversion terminal control unit 5 and coupled oil pumper 6 at least are made as 2 covers, and the input of each inversion terminal control unit 5 is connected in the output of straightening and filtering unit 4 in parallel.
High-voltage switch gear 1 is rated voltage 3kV and the above electrical equipment that is mainly used in cut-offfing and closing galvanic circle, for the electric power break-make between high-tension cable and transformer 2.
Straightening and filtering unit 4 comprises rectifier and filter, and this rectifier is converted to this direct current energy by these three AC power, and this filter is by this direct current energy filtering.Straightening and filtering unit 4 is 5 power supplies of many mouthfuls of oil well inversion terminal control units by common DC bus, when each pumping-unit motor timesharing enters while falling the generating state, the energy that feeds back to DC side is shared by other inversion terminals on same bus, straightening and filtering unit 4 is converted to direct current energy by AC energy, same grid side rectifier and filter are the many mouthfuls of automatically controlled terminal power supplies of oil well by common DC bus, adopt the common DC bus power supply can realize the transmission of electricity of not boosting of remote " one drag many " oil well, the direct current transmission range is longer, without line loss, and having avoided stealing electric situation occurs.
The structure chart of the specific embodiment that as shown in Figure 2, Fig. 2 is the inversion terminal control unit in Fig. 1.The inversion terminal control unit is mainly that this direct current energy is converted to AC energy, and oil pumper provides this AC energy, and to ruuning situation real time monitoring, the control of this inversion terminal control unit.Inversion terminal control unit 5 comprises power converter main circuit 21, detection and protection module 22, single chip control module 23, driver module 24, uneven energy regenerative conservation treatment module 25 and running state monitoring module 26 5 parts.The input of power converter main circuit 21 is connected with the output of straightening and filtering unit 4, the output of power converter main circuit 21 is connected with oil pumper 6, for direct current energy is converted to AC energy, and absorbing DC side overvoltage energy, power converter main circuit 21 parts adopt the quick module compositions such as the 4th novel full control power electronic device IGBT of generation.Power converter main circuit 21 mainly is comprised of three parts: the one, and DC bus input filter capacitor and charge protection unit, the straightening and filtering unit 4 of group control system makes three-phase input current substantially not have phase place to lag behind with respect to input voltage, net side power factor is higher, for the SPWM inverter provides direct current voltage bus, this DC bus input filter capacitor is by this direct current energy filtering, the charge protection unit absorbs the impulse current while just having powered on because of electric capacity, protection electric capacity and rectifier, what adopt is that ambipolar SPWM controls three-phase inverter bridge circuit, can greatly reduce contained Resonance Wave Composition in output voltage, output current is approached sinusoidal wave, and the power factor of input net side loop is not affected, when in uneven energy regenerative conservation treatment module, electric energy is not finished in time, this overvoltage absorbs protected location and absorbs the overvoltage energy on this common DC bus.The 2nd, SPWM inverter, employing be the double-pole PWM control three-phase inverter bridge circuit, can greatly reduce contained Resonance Wave Composition in output voltage, output current is approached sinusoidal wave, and on the not impact of power factor of input net side loop.The 3rd, overvoltage absorbs protected location, overtension while preventing that the DC bus energy regenerative from relatively concentrating, overvoltage absorbs protected location and realizes switch control by the high-power IGBT power model, the formation of this break-make control logic signal, comprehensively to complete with the specific control algolithm of single chip control module 23 by detecting with the logic judgement of protection module 22, Main Function is to absorb DC side overvoltage energy, prevent that the overvoltage caused due to uneven energy regenerative from threatening, during overvoltage absorption protected location is devoted oneself to work, single chip control module 23 and detection and protection module 22 all can provide corresponding LED indication, when uneven energy regenerative conservation treatment module can not be utilized the overvoltage energy fully, voltage raises, at this moment overvoltage absorbs protected location will conducting, absorb overvoltage.
Detect the test side that is connected in power converter main circuit 21 with protection module 22; and the parameters such as voltage, electric current, power factor and power of pumping-unit motor are detected in real time; except the protection realized this device; can also complete the monitoring to the pumping-unit motor running status, occur at motor automatically sending sound and light alarm under the abnormal conditions such as overvoltage, overcurrent, overload, phase shortage.
Single chip control module 23 is connected in and detects and protection module 22; 16 dsPIC30F series DSP single-chip microcomputers and high-frequency PWM control mode have been applied; complete the optimizing control algolithm of electrical machine energy-saving operation; operating state to oil pumper and drive motors is controlled automatically, makes pumping-unit motor run on all the time the operating state of power factor and efficiency the best.Single chip control module 23 is as the intelligent control core of whole system; continuously by detecting and protection module 22; the parameters such as voltage, electric current, power factor and power to pumping-unit motor detect in real time; and then the operating state of motor is comprehensively judged; and by power converter main circuit 21; use unique SWM control method, realize level and smooth inverter operation and Energy Saving Control to motor.
The input of driver module 24 is connected in the output of single chip control module 23; driver module 24 output with the control end of power converter main circuit 21, be connected, mainly adopt special-purpose integrated drive chips KA962 to realize the driving of high power device IGBT and strong and weak electricity isolation and protection.When the DC bus energy regenerative is concentrated, while causing busbar voltage too high, by driver module 24, control uneven energy regenerative conservation treatment module 25, the uneven regenerated energy of oil pumper is processed in time.
Uneven energy regenerative conservation treatment module 25 is connected in test side and the driver module 24 of power converter main circuit 21.The design of the uneven energy regenerative conservation treatment part of oil pumper; for the motor energy regenerative problem of generating electricity; by uneven energy regenerative conservation treatment module 25 and the collaborative connection of power converter main circuit 21; by single chip control module 23, detection, with protection module 22, coordinate; complete detection feedback, the switching between uneven energy regenerative conservation treatment module 25 and pumping-unit motor and coordinate to control, and reaching the tracking balance effect of power by the automatic adjusting of closed-loop system.
Running state monitoring module 26 is connected in single chip control module 23, and the ruuning situation of inversion terminal control unit 5 is carried out to real time monitoring, control.Running state monitoring module 26 comprises LED display window, supervisory keyboard and running state monitoring lamp.By the LED display window, at any time operating state and the operating condition of system are monitored, Guarantee control system can be processed at fault moment in time, also can in time the fault message in system be stored, so that the user goes to search failure cause simultaneously.Can select and set two kinds of operational modes by supervisory keyboard, for example, mode 1 is common open loop converting operation; Mode 2 is the upper and lower stroke frequency automatic switchover of oil pumper operations.In one embodiment, supervisory keyboard can carry out the inversion starting terminal, stops, resetting, rotating, programming, data setting, carry out upper and lower frequency adjustment (carrying out digital addition and subtraction) and frequency modulation.The running state monitoring lamp comprises running LED, halted state indicator light, malfunction indicator light, forward indicator light and reversion indicator light, to show various running statuses.The schematic diagram of the running state monitoring panel that as shown in Figure 3, Fig. 3 is running state monitoring module 26.The running state monitoring panel comprises fm dial 1, numeral+2, program key 3, numeral-4, data key 5, forward/reverse 6, move 7, stop/reset 8, run indicator 9, stop indicator light 10, malfunction indicator lamp 11, forward indicator light 12, reversion indicator light 13 and LED and show 14.
Inversion terminal control unit 5 is converted to AC energy by direct current energy, while powering on starting, system is carried out to self diagnosis, and meeting starting conditions can starting operation.Pumping-unit motor adopts the inversion soft start runner, has not only increased starting torque but also reduced starting current, by unique SPWM waveform generator and corresponding control algolithm, produces the SPWM control signal, realizes inversion control.At any time according to parameters such as the voltage that the oil pumper provided with protection module 22 is provided, electric currents; according to certain digital algorithm; calculate in real time the operate power when front motor; size according to its load factor; change the modulation rule of SPWM control switch signal, thereby realize pumping-unit motor load dynamic tracking jumpy and Energy Saving Control.At any time operating state and the operating condition of system are monitored, Guarantee control system can be processed at fault moment in time, also can in time the fault message in system be stored simultaneously, so that the user goes to search failure cause, according to the detection of falling the generating state information provided with protection module 22 is provided, make the logic analysis judgement, on the one hand by the automatic feed-in DC bus of the uneven energy regenerative of oil pumper, for many oil well terminals are shared, on the other hand, when the DC bus energy regenerative is concentrated, while causing busbar voltage too high, control uneven energy regenerative conservation treatment module 25 by driver module 24, uneven regenerated energy to oil pumper is processed in time.
Claims (10)
1. the rod-pumped well group control system based on DC bus, it is characterized in that, should the rod-pumped well group control system based on DC bus comprise transformer, straightening and filtering unit and a plurality of inversion terminal control unit, this transformer is reduced to 380V or mesohigh three-phase alternating-current supply by high-tension electricity, this straightening and filtering unit is converted to direct current energy by these three AC power, a plurality of inputs of the plurality of inversion terminal control unit are connected in the output of this straightening and filtering unit in parallel by common DC bus, a plurality of outputs connect respectively a plurality of oil pumpers, the plurality of inversion terminal control unit is converted to AC energy by this direct current energy, for the plurality of oil pumper provides this AC energy, and to the ruuning situation real time monitoring of this inversion terminal control unit, control.
2. the rod-pumped well group control system based on DC bus according to claim 1, it is characterized in that, should the rod-pumped well group control system based on DC bus also comprise high-voltage switch gear, this high-voltage switch gear is connected in this transformer, controls the electric power break-make between high-tension cable and this transformer.
3. the rod-pumped well group control system based on DC bus according to claim 1, it is characterized in that, should the rod-pumped well group control system based on DC bus also comprise air switch, this air switch connects the input of this transformer and this straightening and filtering unit, controls the electric power break-make between this transformer and this straightening and filtering unit.
4. the rod-pumped well group control system based on DC bus according to claim 1, it is characterized in that, this straightening and filtering unit comprises rectifier and filter, and this rectifier is converted to this direct current energy by these three AC power, and this filter is by this direct current energy filtering.
5. the rod-pumped well group control system based on DC bus according to claim 1, it is characterized in that, this inversion terminal control unit comprises the power converter main circuit, detection and protection module and single chip control module, the input of this power converter main circuit is connected with the output of this straightening and filtering unit, output is connected with this pumping-unit motor, it is converted to this AC energy by this direct current energy, for this pumping-unit motor provides this AC energy, and absorb the overvoltage energy on this common DC bus, this detection and protection module are connected in the test side of this power converter main circuit, its parameter to the motor of this oil pumper detects in real time, and detection signal is transferred to this single chip control module, this single chip control module receives this detection signal, and judge the operating state of this motor according to this detection signal, this AC energy provided to control this power converter main circuit.
6. the rod-pumped well group control system based on DC bus according to claim 5; it is characterized in that; this power converter main circuit comprises that DC bus input filter capacitor, charge protection unit, SPWM inverter and overvoltage absorb protected location; this DC bus input filter capacitor is by this direct current energy filtering; this charge protection unit absorbs the impulse current while just having powered on because of this DC bus input filter capacitor; this SPWM inverter is converted to this AC energy by this direct current energy, and this overvoltage absorbs protected location and absorbs the overvoltage energy on this common DC bus.
7. the rod-pumped well group control system based on DC bus according to claim 5, is characterized in that, this detection and protection module sound and light alarm occurs under abnormal conditions automatically sending at this motor.
8. the rod-pumped well group control system based on DC bus according to claim 5, is characterized in that, this 16 dsPIC30F series DSP single-chip microcomputers of single chip control module application and high-frequency PWM control mode.
9. the rod-pumped well group control system based on DC bus according to claim 5, it is characterized in that, this inversion terminal control unit also comprises driver module and uneven energy regenerative conservation treatment module, the input of this driver module is connected in the output of this single chip control module, the output of this driver module is connected with the control end of this power converter main circuit, to drive this power converter main circuit, and strong and weak electricity isolates to protect this power converter main circuit, this imbalance energy regenerative conservation treatment module is connected in test side and this driver module of this power converter main circuit, absorb the overvoltage energy on this common DC bus.
10. the rod-pumped well group control system based on DC bus according to claim 9; it is characterized in that; when this detection and protection module detect on this common DC bus overtension; overvoltage signal is transferred to this single chip control module; this single chip control module is transferred to this driver module by this overvoltage signal, makes this imbalance energy regenerative conservation treatment module absorb the overvoltage energy on this common DC bus under the driving of this driver module.
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| CN103956942A (en) * | 2014-04-04 | 2014-07-30 | 合康变频科技（武汉）有限公司 | Device for driving multiple pumping units based on common direct current bus |
| CN104852669A (en) * | 2015-04-30 | 2015-08-19 | 西安鹏瑞石油科技有限公司 | Variable-frequency mutual feedback control system for group control of oil wells |
| CN106684877A (en) * | 2017-02-17 | 2017-05-17 | 青岛中石大蓝天石油技术有限公司 | Intelligent microgrid control system special for oil well |
| CN109989730A (en) * | 2019-03-15 | 2019-07-09 | 北京陆海新程科技有限公司 | A kind of pumping unit for oil field system of efficient electricity-saving |
| CN110374577A (en) * | 2019-07-22 | 2019-10-25 | 刘学峰 | Oil well digital remote cluster control system |
| CN114718514A (en) * | 2021-01-06 | 2022-07-08 | 中国石油化工股份有限公司 | Beam-pumping unit direct current bus group control algorithm based on power weighted prediction |
| RU2797340C1 (en) * | 2022-06-01 | 2023-06-02 | Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" | Method for regulation of instant power consumption by group of electric drives of sucker rod pumping units |
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| CN104852669A (en) * | 2015-04-30 | 2015-08-19 | 西安鹏瑞石油科技有限公司 | Variable-frequency mutual feedback control system for group control of oil wells |
| CN106684877A (en) * | 2017-02-17 | 2017-05-17 | 青岛中石大蓝天石油技术有限公司 | Intelligent microgrid control system special for oil well |
| CN109989730A (en) * | 2019-03-15 | 2019-07-09 | 北京陆海新程科技有限公司 | A kind of pumping unit for oil field system of efficient electricity-saving |
| CN109989730B (en) * | 2019-03-15 | 2023-07-28 | 陈继军 | Efficient electricity-saving pumping unit system for oil field |
| CN110374577A (en) * | 2019-07-22 | 2019-10-25 | 刘学峰 | Oil well digital remote cluster control system |
| CN114718514A (en) * | 2021-01-06 | 2022-07-08 | 中国石油化工股份有限公司 | Beam-pumping unit direct current bus group control algorithm based on power weighted prediction |
| RU2797340C1 (en) * | 2022-06-01 | 2023-06-02 | Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" | Method for regulation of instant power consumption by group of electric drives of sucker rod pumping units |
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Application publication date: 20131204 |