CN115001353A - Intelligent control method and system for variable frequency speed regulation of pumping well - Google Patents
Intelligent control method and system for variable frequency speed regulation of pumping well Download PDFInfo
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- 238000005086 pumping Methods 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000003129 oil well Substances 0.000 claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
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- 238000005265 energy consumption Methods 0.000 abstract description 6
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- 238000004134 energy conservation Methods 0.000 abstract description 3
- 238000010248 power generation Methods 0.000 abstract description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
The invention relates to an intelligent control method and a control system for variable frequency speed regulation of an oil pumping well, which are used for adjusting and controlling the frequency of a motor in each operation period in real time by combining the operation characteristics of an oil pumping unit through an input power curve. Under the condition of keeping the impulse frequency unchanged, the rotating speed of the motor is adjusted through intelligent frequency conversion, so that the 'peak clipping and valley filling' of a motor power curve is realized, the maximum power is reduced, the minimum power is improved, the root mean square of the motor power curve is reduced, the working efficiency of a system is improved, and the energy-saving effect is achieved; the method can realize energy conservation and consumption reduction of the pumping well by intelligently adjusting the rotating speed of the motor in real time under the condition of not reducing the yield of the oil well; the problem of unbalance/underbalance of the pumping unit during operation can be effectively solved, and the phenomenon of reverse power generation can be reduced to a certain degree; the device can automatically and intelligently adjust the frequency of the motor according to indicator diagram data acquired by the indicator, does not need manual intervention and manual operation, contributes to digital and intelligent management of an oil well, and is easy to popularize.
Description
Technical Field
The invention relates to a control technology, in particular to a frequency-conversion speed-regulation intelligent control method and a frequency-conversion speed-regulation intelligent control system for an oil pumping well.
Background
The oil well realizes the self-injection production by depending on the stratum energy in the initial production stage, and enters the later development stage, and most of the oil wells are produced by depending on the artificial lifting mode along with the stratum energy failure. The oil pumping unit lifting technology has a hundred years of research and application history due to the characteristics of simple structure, firmness and reliability, and always occupies the dominant position of artificial lifting.
The periodic fluctuation load and the lower motor efficiency of the pumping unit cause the overall efficiency of the pumping unit system to be low and the energy consumption to be high. The pumping well is subjected to energy-saving transformation through structural transformation of the pumping unit or advanced control means, so that energy conservation and efficiency improvement are realized, loss is reduced, great economic benefits are generated, and the method has important significance on efficient exploitation and production of the oil field.
The energy-saving technology of the oil pumping system mainly surrounds the improvement of the structure of the oil pumping unit, the control technology of the motor and the motor, the arrangement of an energy-saving device and the like. The appearance of the variable frequency speed control technology overcomes the defects of a direct current motor, overcomes the defects of an alternating current motor in the aspect of speed control performance, and is widely used in the petroleum industry.
At present, an energy-saving means based on a variable frequency speed regulation technology mostly belongs to macroscopic regulation, namely the change of the pumping speed of a sucker rod pump system is realized by optimally regulating the stroke frequency by combining the liquid supply capacity of an oil reservoir and the working condition of a pump, and the power consumption and the system efficiency of single ton oil production are improved. Especially for the low-yield well with insufficient liquid supply, the rotating speed of the motor is reduced through the frequency converter, the adjustment of reducing the frequency of stroke of the pumping well is realized, and although the system efficiency can be improved to a certain degree, the following problems exist: firstly, the optimal adjustment of the stroke frequency depends on the accurate calculation of the inflow dynamics of the oil well, and the inflow dynamics of the oil well can obviously change in different exploitation stages of an oil deposit; secondly, when the rotating speed of the motor is reduced by adopting a frequency converter, the driving efficiency of the motor is reduced along with the reduction of the rotating speed of the motor; thirdly, energy consumption exists when the frequency converter works, the frequency converter is not expensive, and when the frequency converter is only used for simple burst adjustment, economic benefits are possibly poor.
Currently, the existing scholars carry out theoretical research on the pumping unit well speed change microscopic regulation and control technology, the practical problem of pumping unit speed change optimization is converted into the mathematical problem of solving unknown functions according to the known conditions, an oil pumping system running state and characteristic simulation model and a real-time motor frequency optimization design mathematical model are established, energy conservation and efficiency improvement are taken as optimization targets, and an optimization method is adopted to obtain an optimal solution under the condition of meeting constraint conditions. However, the variable frequency regulation and control technology needs advanced, reliable and high-precision hardware equipment and a mature and efficient intelligent control method to ensure that the whole system can accurately and effectively control the operation of the pumping well, so that the system efficiency is improved, and the power consumption is reduced.
Disclosure of Invention
Aiming at the problem that the stress characteristic of an oil pumping well in the operation process cannot be improved by the oil pumping well frequency conversion control technology, the intelligent control method and the intelligent control system for the oil pumping well frequency conversion speed regulation are provided, the operation frequency curve of a motor can be optimized through the basic parameters of the oil pumping well and data collected by a power indicator, the frequency of the motor is adjusted in real time by using a frequency converter, the energy consumption of the motor is reduced, and the energy-saving effect is achieved.
The technical scheme of the invention is as follows: a frequency-conversion speed-regulation intelligent control method for an oil pumping well specifically comprises the following steps:
1) establishing a pumping well system model by utilizing a pumping well kinematics theory according to the structural parameters of the pumping well and the suspension point load-displacement data;
2) acquiring the suspension point load and displacement of the pumping well in a single operating cycle by utilizing a commonly matched dynamometer of the pumping well;
3) based on the pumping well system model in the step 1), calculating a single-cycle pumping unit crank load torque curve, a balance torque curve and a net torque curve when the current constant frequency operation is performed;
4) according to the inherent characteristics of the motorParameters and the net torque curve of the step 3), and a motor input power curve and a power Root Mean Square (RMS) of a single period under the current stroke are calculated 0 ；
5) Based on the indicator diagram data in the step 2) and the motor input power curve and the root mean square RMS of the single period under the current stroke obtained in the step 4) 0 In combination with a pumping well system model, searching a motor frequency curve corresponding to the minimum root mean square power as a motor frequency optimization curve;
6) the motor frequency optimization curve obtained in the step 5) is a current optimization result and is sent to a frequency converter for motor control;
7) and in the operation process of the pumping well, under the condition of ensuring that the frequency of stroke is unchanged, repeating the steps 2) -6), and adjusting, controlling and calculating the motor frequency of each operation period in real time to determine a motor frequency optimization curve.
Further, the specific method for searching the motor frequency curve corresponding to the minimum root mean square power is as follows: according to the current motor frequency and the set frequency variation range, the set of the motor frequency curve is randomly set to be F ═ F 1 ,f 2 ,...,f n Collecting as a particle swarm, and calculating a motor input power curve and a corresponding power root mean square according to the suspension point displacement and the load data in the step 2) by adopting a particle swarm optimization algorithm and the steps 3) and 4); and continuously iterating and calculating for n times to obtain the power root-mean-square minimum value correspondingly calculated by the motor frequency curve, namely the motor frequency optimization curve.
Further, the motor frequency optimization curve obtained in the step 5) is expressed by a Fourier function method and used as the control frequency of the motor in the current period, so that the frequency of the motor in a single period is ensured to be unchanged.
A pumping well system model used in the pumping well frequency conversion speed regulation intelligent control method, the pumping well factor is composed of the oil well parameter and the stroke, the stroke frequency, the pump diameter, the pump-down depth pumping parameter; calculating the load of the suspension point of the pumping unit according to the oil well factors and the motion law of the suspension point of the pumping unit; the suspension point load and the torque factor of the oil pumping unit form load torque; the balance torque determined by the oil pumping unit balancing device is combined with the load torque to obtain the net torque of the oil pumping unit; the motor speed and the net torque together determine a motor power curve.
A frequency conversion and speed regulation intelligent control system of an oil pumping motor-pumped well comprises an oil well module, an operation module, an oil pumping motor-pumped well structure module, a dynamometer input module, a motor characteristic input module, a motor frequency optimization module, a control module and a motor frequency output module; the system comprises an oil well parameter input oil well module, an operation task sending operation module, an oil pumping well structure parameter input oil pumping well structure module, a motor inherent characteristic parameter sending motor characteristic input module, a nonlinear optimization algorithm and a target power transmission motor frequency optimization module, a dynamometer input module, a control module and a motor frequency output module, wherein the dynamometer input module collects single-cycle suspension point load and displacement information and sends the single-cycle suspension point load and displacement information to the control module, the control module calls data of the oil well module, the operation module, the oil pumping well structure module and the motor characteristic input module, the algorithm in the motor frequency optimization module is used for calculating the optimal motor frequency, the calculation result is output to the power transmission motor frequency output module, and the motor frequency output module outputs the motor working frequency of one cycle to a frequency converter.
Preferably, the structural parameters in the pumping well structure module comprise a walking beam front arm length, a walking beam rear arm length, a connecting rod effective length, a distance from a walking beam axis to a base, a horizontal distance from the walking beam axis to a crank axis, a distance from a crank shaft axis to the base, a crank mass, a balance block mass, a pumping unit structure unbalance weight, a crank radius, a crank center of gravity radius, a crank balance radius, a balance phase angle, a transmission ratio, four-connecting-rod structure efficiency, a pumping unit belt pulley and a reduction gearbox efficiency.
Preferably, the motor intrinsic parameters include a rated power, a rated rotational speed, a rated efficiency and a no-load power.
The invention has the beneficial effects that: according to the frequency-conversion speed-regulation intelligent control method and the control system for the pumping unit well, the frequency of the motor in each operation period is adjusted and controlled in real time by inputting a power curve and combining the operation characteristics of the pumping unit, so that the energy is saved in a real sense; the variable frequency speed regulation considers the matching of the load and the motor output and the working stability of the motor at the same time, and improves the working efficiency of the manuscript system.
Drawings
FIG. 1 is a schematic diagram of the energy saving of a rod pumped well according to the present invention;
FIG. 2 is a graphical representation of a rod pumped well (displacement-load) indicator of the present invention;
FIG. 3 is a graphical illustration of a torque calculation for a rod pumped well according to the present invention;
FIG. 4 is a graph of the input power to the motor of the present invention;
FIG. 5 is a graph of the frequency optimization of the motor of the present invention;
FIG. 6 is a graph of motor power before and after the smart frequency modulation of the present invention;
FIG. 7 is a flow chart of the frequency control intelligent control strategy of the present invention;
FIG. 8 is a flow chart of the intelligent control motor frequency optimization calculation of the present invention;
FIG. 9 is a comparison of motor frequency curves before and after smart frequency modulation in accordance with the present invention;
fig. 10 is a comparison graph of power curves before and after smart frequency tuning according to the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The invention optimizes the rotating speed of the motor aiming at the operation stress characteristics and the working characteristics of the pumping well, and adjusts and controls the frequency of the motor in real time through the frequency converter, so that the power curve of the motor changes stably and the energy consumption is reduced.
The beam pumping unit is a four-bar linkage mechanism formed by using the connecting line of the center of a crank shaft and a bearing in a beam as a fixed rod and using a rear arm, a connecting rod and a crank as movable rods.
As shown in fig. 1, in the energy-saving schematic diagram of the rod-pumped well, during the working process of the rod-pumped well, the oil well factor and the suspension point motion law of the pumping unit, which are composed of oil well parameters, pumping parameters such as stroke, stroke frequency, pump diameter and pump descending depth, determine the magnitude of the suspension point load of the pumping unit, and the suspension point load and the torque factor of the pumping unit form the load torque. The balance device of the oil pumping unit determines the balance torque, and the net torque of the oil pumping unit is obtained by combining the load torque. The motor speed and the net torque jointly determine the power curve of the motor, thereby influencing the system efficiency and energy consumption.
According to the kinematics and dynamics theory of the pumping unit, the load torque curve, the balance torque curve and the net torque curve can be sequentially calculated according to the oil well parameters, the pumping unit parameters and the suspension point load curve (as shown in figure 2), and the structure and the working characteristics of the pumping unit determine that the net torque curve of a crankshaft is fluctuant, such as a torque calculation curve graph of a pumping unit well shown in figure 3.
The motor load power and the crankshaft net torque have the following relationship:
wherein, P in Load power for the motor, KW; m is net torque, N.m; eta 1 The transmission efficiency from the speed reducer to the motor is improved; omega is crank angular velocity, rad/s; eta 2 The instantaneous efficiency of the motor; k is a radical of 1 、k 2 Are coefficients.
When a conventional power frequency constant-rotation-speed motor works or a frequency converter drives the motor to work at a constant rotation speed, the rotation speed of the motor is unchanged, and the angular speed of a crank is unchanged, so that the change rule of a power curve of the motor is the same as that of a net torque curve, namely a fluctuation curve, and obvious peak values and peak valleys exist, as shown in a motor input power curve chart shown in fig. 4.
According to the current motor load curve, a motor frequency curve (as shown in figure 5) is optimized and calculated by utilizing an optimization method, and a motor load power curve (as shown in a motor power curve chart before and after intelligent frequency modulation of figure 6) is changed, so that the motor load power curve is subjected to peak clipping and valley filling, approaches to an average power value as much as possible, is stable in power change in the operation process, reduces the maximum power, and improves the minimum power, thereby reducing the total output power of the motor and realizing the energy-saving target.
The invention uses the suspension point load-displacement data measured and collected by a commonly matched indicator of an oil well as the self parameters (the structural parameters of the pumping unit and the characteristic parameters of the motor) of the pumping unit well, calculates the frequency curve of a single-cycle motor by using an intelligent control motor frequency curve optimization algorithm, controls the motor to operate according to the frequency curve by a frequency converter, and realizes the real-time control of the motor frequency, and the flow of the frequency-conversion speed-regulation intelligent control strategy is shown in figure 7.
The method comprises the following specific implementation steps:
(1) acquiring the suspension point load and displacement of the pumping well in a single operating cycle by utilizing a commonly matched dynamometer of the pumping well;
(2) according to structural parameters (a front arm length of a walking beam, a rear arm length of the walking beam, an effective length of a connecting rod, a distance from an axle center of the walking beam to a base, a horizontal distance from the axle center of the walking beam to an axle center of a crank, a distance from an axle center of the crank to the base, a mass of the crank, a mass of a balance block, an unbalanced weight of a pumping unit structure, a radius of the crank center of gravity, a radius of the crank balance, a balance phase angle, a transmission ratio, a four-connecting-rod structure efficiency, a belt pulley of the pumping unit, a reduction gearbox efficiency and the like) of the pumping unit, a pumping unit system model is built by using a kinematics theory of the pumping unit well, and a single-cycle crank load torque curve, a balance torque curve and a net torque curve of the pumping unit are calculated when the current constant frequency operates.
(3) According to the characteristic parameters (rated power, rated rotating speed, rated efficiency, no-load power and the like) of the motor and the net torque curve in the step (2), calculating the input power curve and the root mean square RMS (root mean square) RMS of the motor in a single period under the current stroke 0 Namely, the power curve and the root mean square of the pumping unit before intelligent frequency modulation during constant frequency operation.
(4) Based on the indicator diagram data, the single-period motor input power curve and the root mean square RMS in the steps (1) and (3) 0 And (3) combining the oil pumping well system model in the step (2), and calculating and determining a motor frequency optimization curve by using an intelligent control motor frequency curve optimization algorithm. The calculation flow is shown in fig. 8:
1) according to the suspension point displacement and the load data in the step (1), calculating an input power curve and power Root Mean Square (RMS) of the motor according to the steps (2) and (3) 0 ；
2) According to the current motor frequency and the set frequency variation range, the set of the motor frequency curves is randomly set to be F ═ F 1 ,f 2 ,...,f n And (6) taking the set as a nonlinear set, and calculating a motor frequency curve f by adopting a nonlinear optimization method (particle swarm optimization algorithm) 1 Calculating an input power curve and root mean square RMS of the motor according to the steps (2) and (3) according to the suspension point displacement and the load data in the step (1) 1 ；
3) Comparing RMS 0 And RMS 1 Of (2) if RMS 1 ≥RMS 0 The magnitude, then calculate the frequency curve f of the motor 2 Calculating an input power curve and root mean square RMS of the motor according to the steps (2) and (3) according to the suspension point displacement and the load data in the step (1) 2 ；
4) Through continuous iterative calculation for n times, the frequency curve f of the motor n Corresponding calculated power root mean square RMS n Is a minimum value, f n Namely, the motor frequency optimization curve. The motor frequency curve is expressed by a Fourier function method, so that the time of a single period can be kept unchanged, namely, the impulse frequency is kept unchanged, and the motor frequency curve is a smooth curve, so that the frequency change is smooth, and the instruction execution and control operation of a frequency converter and a motor are easy.
5) The frequency converter optimizes the curve f according to the motor frequency n And sending a frequency real-time change instruction to the motor to control the motor to run in a real-time frequency conversion manner. And repeating the steps, continuously optimizing and calculating a motor frequency curve in the operation process of the pumping well, and carrying out real-time regulation and control on the motor frequency of each operation period under the condition of ensuring that the stroke frequency is unchanged.
A frequency conversion and speed regulation intelligent control system of an oil pumping motor-pumped well comprises an oil well module, an operation module, an oil pumping motor-pumped well structure module, a dynamometer input module, a motor characteristic input module, a motor frequency optimization module, a control module and a motor frequency output module; the system comprises an oil well parameter input oil well module, an operation task input operation module, an oil pumping well structure parameter input oil pumping well structure module, a motor inherent characteristic parameter input motor characteristic input module, a nonlinear optimization algorithm and a target power transmission motor frequency optimization module, a power indicator input module collects single-cycle suspension point load and displacement information and sends the information to a control module, the control module calls data of the oil well module, the operation module, the oil pumping well structure module and the motor characteristic input module, optimal motor frequency calculation is carried out by using an algorithm in the motor frequency optimization module, a calculation result is output to a power transmission motor frequency output module, and the motor frequency output module outputs a cycle of motor working frequency to a frequency converter.
Under the condition that the impulse frequency is kept unchanged, the rotating speed of the motor is adjusted through intelligent frequency conversion (comparison of motor frequency curves before and after intelligent frequency modulation is shown in figure 9), so that a motor power curve is subjected to peak clipping and valley filling, the maximum power is reduced, the minimum power is improved, the root mean square of the motor power curve is reduced (after intelligent frequency modulation, the maximum value of the motor power curve is reduced by 25%, the minimum value is increased by 12%, and the root mean square is reduced by 20% in a comparison graph of the power curves before and after intelligent frequency modulation is shown in figure 10), the working efficiency of a system is improved, and the energy-saving effect is achieved;
the invention can realize energy saving and consumption reduction of the oil pumping well by real-time intelligent regulation of the rotating speed of the motor under the condition of not reducing the yield of the oil well;
the invention can effectively improve the unbalance/underbalance problem (as shown in figure 10) when the oil pumping unit operates, the power balance degree is reduced from 142% to 85%, and the phenomenon of 'reverse power generation' can be reduced to a certain degree;
can be according to the indicator diagram data that the indicator gathered, need not artificial intervention and manually operation to the automatic intelligent regulation of motor frequency, help the digitization and the intelligent management of oil well, easily promote.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A frequency conversion speed regulation intelligent control method for an oil pumping well is characterized by comprising the following steps:
1) establishing a pumping well system model by utilizing a pumping well kinematics theory according to the structural parameters of the pumping well and the suspension point load-displacement data;
2) acquiring the suspension point load and displacement of the pumping well in a single operating cycle by utilizing a commonly matched dynamometer of the pumping well;
3) based on the oil pumping well system model in the step 1), calculating a single-cycle oil pumping unit crank load torque curve, a balance torque curve and a net torque curve when the current constant frequency operation is carried out;
4) calculating the input power curve and power Root Mean Square (RMS) of the motor in a single period under the current time according to the inherent characteristic parameters of the motor and the net torque curve in the step 3) 0 ；
5) Based on the indicator diagram data in the step 2) and the motor input power curve and the root mean square RMS of the single period under the current stroke obtained in the step 4) 0 In combination with a pumping well system model, searching a motor frequency curve corresponding to the minimum root mean square power as a motor frequency optimization curve;
6) the motor frequency optimization curve obtained in the step 5) is a current optimization result and is sent to a frequency converter for motor control;
7) and in the operation process of the pumping well, repeating the steps 2) to 6) under the condition of ensuring that the stroke frequency is unchanged, and adjusting, controlling and calculating the motor frequency in each operation period in real time to determine a motor frequency optimization curve.
2. The intelligent control method for frequency conversion and speed regulation of the rod-pumped well according to claim 1, wherein the specific method for searching the frequency curve of the motor corresponding to the minimum root mean square of the power is as follows:
according to the current motor frequency and the set frequency variation range, the set of the motor frequency curves is randomly set to be F ═ F 1 ,f 2 ,...,f n Collecting as a particle swarm, and calculating a motor input power curve and a corresponding power root mean square according to the suspension point displacement and the load data in the step 2) by adopting a particle swarm optimization algorithm and the steps 3) and 4); and continuously iterating and calculating for n times to obtain the power root-mean-square minimum value correspondingly calculated by the motor frequency curve, namely the motor frequency optimization curve.
3. The intelligent control method for variable frequency speed regulation of the rod-pumped well according to claim 1, wherein the frequency optimization curve of the motor obtained in the step 5) is expressed by a Fourier function method and used as the control frequency of the motor in the current period to ensure that the frequency of the motor in a single period is unchanged.
4. A pumping well system model used in the pumping well frequency conversion speed regulation intelligent control method is characterized in that oil well parameters and stroke, stroke frequency, pump diameter and pump-down depth pumping parameters form oil well factors; calculating the load of the suspension point of the pumping unit according to the oil well factors and the motion law of the suspension point of the pumping unit; the suspension point load and the torque factor of the oil pumping unit form a load torque; the balance torque determined by the oil pumping unit balancing device is combined with the load torque to obtain the net torque of the oil pumping unit; the motor speed and the net torque together determine a motor power curve.
5. A frequency conversion speed regulation intelligent control system of a pumping well is characterized by comprising an oil well module, an operation module, a pumping well structure module, a dynamometer input module, a motor characteristic input module, a motor frequency optimization module, a control module and a motor frequency output module; the system comprises an oil well parameter input oil well module, an operation task sending operation module, an oil pumping well structure parameter input oil pumping well structure module, a motor inherent characteristic parameter sending motor characteristic input module, a nonlinear optimization algorithm and a target power transmission motor frequency optimization module, a dynamometer input module, a control module and a motor frequency output module, wherein the dynamometer input module collects single-cycle suspension point load and displacement information and sends the single-cycle suspension point load and displacement information to the control module, the control module calls data of the oil well module, the operation module, the oil pumping well structure module and the motor characteristic input module, the algorithm in the motor frequency optimization module is used for calculating the optimal motor frequency, the calculation result is output to the power transmission motor frequency output module, and the motor frequency output module outputs the motor working frequency of one cycle to a frequency converter.
6. The system of claim 5, wherein the structural parameters of the pumping well structure module include a beam front arm length, a beam rear arm length, a connecting rod effective length, a beam axis to base distance, a beam axis to crank axis horizontal distance, a crank axis to base distance, a crank mass, a balance weight mass, a pumping unit structure non-balance weight, a crank radius, a crank center of gravity radius, a crank balance radius, a balance phase angle, a transmission ratio, a four-bar structure efficiency, a pumping unit belt pulley and a reduction gearbox efficiency.
7. The intelligent variable-frequency speed-regulating control system for the rod-pumped well according to claim 5, wherein the intrinsic characteristic parameters of the motor comprise rated power, rated rotating speed, rated efficiency and no-load power.
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| Publication number | Priority date | Publication date | Assignee | Title |
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Denomination of invention: Intelligent control method and control system for variable frequency speed regulation of pumping well Granted publication date: 20230616 Pledgee: China Construction Bank Corporation Shanghai Hongkou Branch Pledgor: Shanghai datan Energy Technology Co.,Ltd. Registration number: Y2024310000060 |