CN105119311B - The control system and its control method of pumping unit - Google Patents

The control system and its control method of pumping unit Download PDF

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Publication number
CN105119311B
CN105119311B CN201510460693.7A CN201510460693A CN105119311B CN 105119311 B CN105119311 B CN 105119311B CN 201510460693 A CN201510460693 A CN 201510460693A CN 105119311 B CN105119311 B CN 105119311B
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China
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power
pumping unit
controller
measuring device
winding
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CN105119311A (en
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梁志珊
王景桐
谭程
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China University of Petroleum Beijing CUPB
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China University of Petroleum Beijing CUPB
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Abstract

The present invention relates to the control system of pumping unit and its control methods, a set of three-phase starting winding is inlaid in the stator slot of the pumping-unit motor, a set of three-phase electric winding and a set of three-phase generation winding, three sets of windings are respectively in the start-up course of motor, it is applied during upstroke process and down stroke, and it is proposed for different technical requirements using no frequency converter using control system and its control method of the invention and there are two kinds of control methods of frequency converter to control motor, realize good energy-saving effect, and overcome " low load with strong power " phenomenon of transformer and motor existing in the prior art, the running efficiency of motor is improved to greatest extent, reduce the loss of motor.Carry out energy storage using super capacitor, and from the existing technological deficiency of mechanical balance weight is overcome at all, have the characteristics that control accurately, be swift in response, mechanical wear it is small.

Description

The control system and its control method of pumping unit
Technical field
The invention belongs to the pumping unit control technology fields in oil recovery machiner, are specifically related to a kind of control system of pumping unit System and its control method.
Background technique
In the prior art, pumping unit mostly uses greatly two kinds of power supply modes: one is, power grid is by transformer directly to oil pumping The motor of machine is powered the sucker rod load of driving pumping unit;The second is power grid is by transformer after diode rectification DC bus be connected with frequency converter, by frequency converter to motor for the sucker rod of electric drive pumping unit.However, above two confession Technological deficiency present in electric mode is, due to electric motor starting power and to operate normally power difference larger, in the past in order to meet Motor big technical requirements of torque in startup stage need the biggish motor of equipped capacitor, but result in motor and are normally transporting It can not be run in the case where row with fully loaded capacity, further transformer is in order to cooperate the capacity of motor, when operating normally Can not full-load run, this has resulted in the presence of " low load with strong power " phenomenon of transformer and motor.The presence of such phenomenon, The core loss and copper loss of motor and transformer are directly resulted in, the running efficiency for then resulting in motor and transformer is lower.
In the prior art, the technical issues of " low load with strong power " in order to solve motor, those skilled in the art adopted in the past It has taken and has inlayed starting and work double winding in the stator slot of motor.In electric motor starting, relatively using rated capacity Big starting winding, and when motor operates normally, it is switched to the technological means gram of the relatively small Working winding of rated capacity Take the technological deficiency of " low load with strong power ".However, in the technical scheme, for pumping unit, in the down stroke stage, due to Pumping unit itself is unable to complete equipilibrium, is easy that motor is made to generate " generating electricity " phenomenon;In the upstroke stage, motor is in electronic shape State.Therefore, starting winding and Working winding can not make motor in upstroke stage and down stroke stage simultaneously with specified appearance The lower operation of amount.
In addition, the technological deficiency of " low load with strong power " in order to overcome motor.Those skilled in the art use in walking beam The rear suspension mechanical balance weight principle of formula pumping unit, is energy-storage travelling wave tube using mechanical balance recast, by the energy in down stroke stage Amount is recycled, and mechanical balance recast is that energy-storage travelling wave tube stores the electric energy of motor and the gravitional force of sucker rod, makes balance weight Potential energy increases;The energy using upstroke storage is carried out in the upstroke stage, mechanical balance weight voluntarily falls because of own wt, Mechanical balance weight and motor collective effect promote sucker rod and complete pumping operation.Such method using mechanical balance weight, although The operational efficiency of motor is improved to a certain extent, but there is no the technologies for fundamentally solving motor " low load with strong power " Defect.In addition, mechanical wear is larger, and energy storage efficiency is low using the technical solution of mechanical balance weight;At pumping unit long-time When working condition, certain variation can occur for mechanical parameter, and equilibrium state when being easy to lose ideal or initial designs is still So that pumping unit generates electric phenomenon, the robustness of the mechanical system of pumping unit is further caused to decline.
Summary of the invention
To overcome above-mentioned shortcomings and deficiencies in the prior art, the invention proposes for no frequency converter and having frequency converter Two kinds of pumping unit technical solutions.This two kinds of control system for oil-pumping unit have been all made of three-winding motor and super capacitor balance weight is comprehensive Technical solution solves " low load with strong power " technological deficiency of motor and transformer existing for pumping unit in the prior art, overcomes Balance weight problem caused by mechanical system is worn.So-called three-winding motor scheme in the present invention, it may be assumed that inlayed in motor stator slot Embedding a set of three-phase starting winding, a set of three-phase electric winding and a set of three-phase generation winding are (or with institute's shape in combination At three sets of windings), used respectively in start-up course, upstroke process and in the down stroke stage to motor.So-called super capacitor Balance weight scheme is exactly that super capacitor virtual equilibrium is utilized to substitute mechanical balance weight again, to realize that super capacitor energy-storage substitutes machine Tool balance weight energy storage avoids tradition machinery balance weight from further making motor because making motor be in generating state after mechanical wear It works under pure power generation and electronic two states, makes a clear distinction between good and evil, provide good cooperation for the work of three-winding motor.
First technical solution of the invention is to achieve the above object: providing a kind of no frequency converter pumping unit control system System, including;
Transformer is connect with power grid, and the power frequency supply or other high frequency electric sources for providing power grid carry out at transformation Reason, the AC power source that output amplitude is adjusted;
Grid power and current measuring device, connect with controller, carry out transformation processing by transformer for measuring Power and electric current;
Super capacitor power and current measuring device, connect with controller, rectify for measuring super capacitor by PWM The power and electric current exported after device;
Bearing power and current measuring device, connect with controller, for measuring the power and electric current of three-winding motor;
Super capacitor is connect with PWM rectifier, on the one hand for storing electric energy, on the other hand for three winding electricity Machine is powered;
PWM rectifier is connect with transformer, and the alternating current for transformer to be exported is converted into direct current;Its with it is super Grade capacitance connection, the direct current for exporting super capacitor are converted to alternating current.
Controller is surveyed with PWM rectifier, grid power and current measuring device, super capacitor power and electric current respectively Amount device, bearing power are connected with current measuring device, top dead-centre sensor, bottom dead centre sensor, are used to control PWM rectification Device is to super capacitor charge or discharge.
Three-winding motor is connect with the sucker rod of the output end of transformer and pumping unit respectively.
Preferably, controller is connect with three-winding motor, for controlling the working condition of switching three-winding motor.
Preferably, the three-winding motor is that three sets of windings: a set of three-phase are inlaid in the stator slot of the motor Start winding, a set of three-phase electric winding and a set of three-phase generation winding.
Preferably, during startup, the controller controls the three-phase starting winding of the three-winding motor and hands over Flow bus connection;In the upstroke stage, the controller controls the three-phase electric winding and ac bus of the three-winding motor Connection;In the down stroke stage, the three-phase generation winding that the controller controls the three-winding motor is connect with ac bus.
The present invention provides a kind of control method on the basis of no frequency converter control system for oil-pumping unit, it is characterised in that: packet Include following steps:
Step A: pumping unit is in lower dead point position;
Step B: controller, which switches to three-winding motor, starts winding working condition, after start completion, at pumping unit In upper dead center position;
Step C: three-winding motor is switched to generating winding working condition by controller, and motor is in rated generation state, Pumping unit is in lower dead point position;
Step D: three-winding motor is switched to electronic winding state by controller, and three-winding motor is in specified electronic shape State, pumping unit are in upper dead center position.
The three-winding motor is that three sets of windings are inlaid in the stator slot of the motor: a set of three-phase starting winding, A set of three-phase electric winding and a set of three-phase generation winding.
Preferably, in step, controller control PWM rectifier charges to super capacitor.
Preferably, in stepb, controller provides the working method of PWM rectifier by judgement: when controller measures Pump load when being less than transformer capacity, controller by grid power and current measuring device, super capacitor power and The information control PWM rectifier of current measuring device, bearing power and current measuring device feedback is worked in a manner of constant pressure, this When, PWM rectifier stops powering to three-winding motor;When the pump load of controller measurement is greater than transformer capacity, control Device processed passes through grid power and current measuring device, super capacitor power and current measuring device, bearing power and current measurement The information control PWM rectifier of device feedback is worked in a manner of constant current, and power grid is whole by PWM by transformer and super capacitor Device is flowed jointly to power to three-winding motor.
In this way, power grid is by the dual power supply of transformer and super capacitor Jing Guo PWM rectifier respectively with constant pressure and constant current side Formula cooperating can realize that pump load power coordination distributes, until completing pumping unit startup stage task.
When control system judges that pumping unit reaches top dead-centre by top dead-centre sensor, pumping unit completes starting and appoints Business, pumping unit initially enter down stroke.
Preferably, in step C, for pumping unit in down stroke, controller provides the work of PWM rectifier by judgement Mode: controller passes through grid power and current measuring device, super capacitor power and current measuring device, bearing power and electricity Flow measuring apparatus feedback information control PWM rectifier is worked in a manner of constant pressure, power grid by transformer and motor commonly through PWM rectifier charges to super capacitor, and the charging circuit by controlling PWM rectifier controls transformer under rated condition.
When control system judges that pumping unit reaches bottom dead centre by bottom dead centre sensor, pumping unit completes starting and appoints Business, pumping unit initially enter down stroke.
Preferably, in step D, controller provides the working method of PWM rectifier by judgement: when controller measures Pump load when being less than transformer capacity, controller by grid power and current measuring device, super capacitor power and The information control PWM rectifier of current measuring device, bearing power and current measuring device feedback is worked in a manner of constant pressure, PWM rectifier stops powering to three-winding motor;When the pump load of controller measurement is greater than transformer capacity, controller Pass through grid power and current measuring device, super capacitor power and current measuring device, bearing power and current measuring device The information control PWM rectifier of feedback is worked in a manner of constant current, and power grid passes through PWM rectifier by transformer and super capacitor It powers jointly to three-winding motor.
In this way, power grid is by the dual power supply of transformer and super capacitor Jing Guo PWM rectifier respectively with constant pressure and constant current side Formula cooperating can realize that pump load power coordination distributes, and complete pumping unit upstroke phased mission.
When control system judges that pumping unit reaches top dead-centre by top dead-centre sensor, upstroke task has been completed, Pumping unit initially enters down stroke.
In this way, pumping unit carries out the work of upstroke and down stroke stage again and again, by using three-winding motor " low load with strong power " for solving motor existing for prior art pumping unit and transformer with super capacitor balance weight integration scenario is asked It inscribes and since mechanical system abrasion leads to balance weight problem.
To achieve the above object, second technical solution of the invention, which is to provide one kind, frequency converter pumping unit control system System, comprising:
Transformer is connect with power grid, and the power frequency supply or other high frequency electric sources for providing power grid carry out at transformation Reason, the AC power source that output amplitude is adjusted;
Grid power and current measuring device, connect with controller, carry out transformation processing by transformer for measuring Power and electric current;
Super capacitor power and current measuring device, connect with controller, rectify for measuring super capacitor by PWM The power and electric current exported after device;
Bearing power and current measuring device, connect with controller, for measuring the power and electric current of three-winding motor;
Rectifier is connect with transformer, and the alternating current for transformer to be exported is converted into direct current and is conveyed to frequency conversion Device;
Frequency converter, one side are connect with rectifier, the converting direct-current power into alternating-current power conveying for rectifier to be exported To three-winding motor;On the other hand it is connect with two-way DC/DC converter, the direct current for two-way DC/DC converter to be exported It is converted into alternating current and is conveyed to three-winding motor;
Two-way DC/DC converter, one side connect with rectifier and frequency converter, on the other hand connect with super capacitor, For controlling the charge and discharge of super capacitor;
Super capacitor is connect with two-way DC/DC converter, on the one hand for storing electric energy, on the other hand for three Winding electric machine is powered;
Controller, respectively with two-way DC/DC converter, grid power and current measuring device, super capacitor power and Current measuring device, bearing power and current measuring device, top dead-centre sensor, bottom dead centre sensor connect, double for controlling To DC/DC converter to super capacitor charge or discharge.
Three-winding motor is connect with the sucker rod of the output end of frequency converter and pumping unit respectively.
Preferably, the two-way DC/DC converter includes BOOST discharge circuit and BUCK charging circuit.
Preferably, controller is connect with three-winding motor, for controlling the working condition of switching three-winding motor.
Preferably, the three-winding motor is that three sets of windings: a set of three-phase are inlaid in the stator slot of the motor Start winding, a set of three-phase electric winding and a set of three-phase generation winding.
Preferably, during startup, the controller controls the three-phase starting winding of the three-winding motor and becomes The connection of frequency device;In the upstroke stage, the three-phase electric winding that the controller controls the three-winding motor is connect with frequency converter; In the down stroke stage, the three-phase generation winding that the controller controls the three-winding motor is connect with frequency converter.
The present invention provides a kind of control method on the basis of having frequency converter control system for oil-pumping unit, it is characterised in that: packet Include following steps:
Step A: pumping unit is in lower dead point position;
Step B: controller, which switches to three-winding motor, starts winding working condition, after start completion, at pumping unit In upper dead center position;
Step C: three-winding motor is switched to generating winding working condition by controller, and motor is in rated generation state, Pumping unit is in lower dead point position;
Step D: three-winding motor is switched to electronic winding state by controller, and three-winding motor is in specified electronic shape State, pumping unit are in upper dead center position.
The three-winding motor is that three sets of windings are inlaid in the stator slot of the motor: a set of three-phase starting winding, A set of three-phase electric winding and a set of three-phase generation winding.
Preferably, in step, controller controls the BUCK charging circuit of two-way DC/DC converter to capacitor charging.
Preferably, in stepb, controller provides the working method of two-way DC/DC converter by judgement: working as control When the pump load of device measurement is less than transformer capacity, controller passes through grid power and current measuring device, super capacitor The information of power and current measuring device, bearing power and current measuring device feedback controls the BOOST of two-way DC/DC converter Discharge circuit stops electric discharge work, and power grid discharges to DC bus in a manner of constant pressure by transformer and rectifier;Work as control When the pump load of device measurement is greater than transformer capacity, controller passes through grid power and current measuring device, super capacitor The information of power and current measuring device, bearing power and current measuring device feedback controls the BOOST of two-way DC/DC converter Discharge circuit discharges to DC bus with constant voltage mode, and power grid is by transformer and rectifier to DC bus in a manner of constant pressure Electric discharge.
In this way, power grid is distinguished by transformer and rectifier and super capacitor by the dual power supply of two-way DC/DC converter It can realize that pump load power coordination distributes with constant current and constant voltage mode cooperating, appoint until completing pumping unit startup stage Business.
When control system judges that pumping unit reaches top dead-centre by top dead-centre sensor, pumping unit completes starting and appoints Business, pumping unit initially enter down stroke.
Preferably, in step C, for oil machine in down stroke, controller provides two-way DC/DC converter by judgement Working method: under the control of the controller, controller passes through grid power and current measuring device, super capacitor power and electric current The BUCK that the information control of measuring device, bearing power and current measuring device feedback controls two-way DC/DC converter charges electric Road charges to super capacitor with current constant mode, reaches transformer work under rated condition by controlling BUCK charging circuit, electricity Net discharges to DC bus in a manner of constant pressure by transformer and rectifier.
When control system judges that pumping unit reaches bottom dead centre by bottom dead centre sensor, pumping unit completes starting and appoints Business, pumping unit initially enter upstroke.
Preferably, in step D, controller provides the working method of two-way DC/DC converter by judgement: working as control When the pump load of device measurement is less than transformer capacity, controller passes through grid power and current measuring device, super capacitor The information of power and current measuring device, bearing power and current measuring device feedback controls the BOOST of two-way DC/DC converter Discharge circuit stops electric discharge work, and power grid discharges to DC bus in a manner of constant pressure by transformer and rectifier;Work as control When the pump load of device measurement is greater than transformer capacity, controller passes through grid power and current measuring device, super capacitor The information control of power and current measuring device, bearing power and current measuring device feedback controls two-way DC/DC converter BOOST discharge circuit discharges to DC bus with constant voltage mode, and power grid is by transformer and rectifier to straight in a manner of constant pressure Flow bus discharge.
In this way, power grid is distinguished by transformer and rectifier and super capacitor by the dual power supply of two-way DC/DC converter It can realize that pump load power coordination distributes with constant current and constant voltage mode cooperating, complete the pumping unit upstroke stage and appoint Business.
When control system judges that pumping unit reaches bottom dead centre by bottom dead centre sensor, upstroke task has been completed, Pumping unit initially enters down stroke.In this way, pumping unit carries out the work of upstroke and down stroke stage again and again, by adopting The " big of motor existing for prior art pumping unit and transformer is solved with three-winding motor and super capacitor balance weight integration scenario Horse traction trolley " problem and due to mechanical system abrasion lead to balance weight problem.
Compared with prior art the present invention has the advantages that substituting mechanical balance weight, super electricity using super capacitor energy-storage Hold energy storage charge and discharge rapidly and the features such as small and easily controllable is lost, and mechanical wear problem is not present;For motor, electricity Machine shares three sets of windings, and on startup, using starting winding, when upstroke detects bottom dead centre, using electronic winding, in undershoot Cheng Shi detects top dead-centre, using generating winding, motor work all under rated capacity under the various working conditions of pumping unit Make, fundamentally solves " low load with strong power " of motor and pumping unit in this way and improve transformer " low load with strong power " and ask Topic.
Detailed description of the invention
Fig. 1 is the structure principle chart of no frequency converter control system for oil-pumping unit preferred embodiment according to the invention.
Fig. 2 is the structure principle chart according to the invention for having frequency converter control system for oil-pumping unit preferred embodiment.
Fig. 3 is the control program figure of the embodiment illustrated in fig. 1 of control system for oil-pumping unit according to the invention.
Fig. 4 is the control program figure of the embodiment illustrated in fig. 2 of control system for oil-pumping unit according to the invention.
Fig. 5 is the upstroke stage energy stream in control system for oil-pumping unit Fig. 1 according to the invention and embodiment illustrated in fig. 2 Xiang Tu.
Fig. 6 is the down stroke stage energy stream in control system for oil-pumping unit Fig. 1 according to the invention and embodiment illustrated in fig. 2 Xiang Tu.
Fig. 7 is the signal of the three-winding motor in control system for oil-pumping unit Fig. 1 according to the invention and embodiment illustrated in fig. 2 Structure.
Specific embodiment
Explanation is further elaborated to the preferred embodiment of the present invention with reference to the accompanying drawing;
Embodiment 1:
As shown in Fig. 1 and Fig. 3, Fig. 5-7, the control system and its controlling party of a kind of pumping unit of no frequency converter, pumping unit Method.
Pumping unit, including the walking beam being connect by walking beam axis with bracket, the horse head connecting with walking beam one end is another with walking beam The connecting rod and motor of connection are held, in the present embodiment, the motor is three-winding motor 5, in the stator of the three-winding motor 5 A set of three-phase starting winding, a set of three-phase electric winding and a set of three-phase generation winding are inlaid in slot.Three-winding motor 5 is successively It is connect with transformer 2 and power grid 1.Displacement sensor is installed on the bracket, institute's displacement sensors include that top dead-centre passes Sensor 11 and bottom dead centre sensor 12, institute's displacement sensors are connect by route with controller 7.In the present embodiment, it also wraps The control system for including its motor is equipped with transformer 2 in the control system, connect with power grid 1, be used to provide in power grid Power frequency supply or high frequency electric source carry out transformation processing, the AC power source that output amplitude is adjusted.In the control system, also Including
Grid power and current measuring device 8, connect with controller, carry out at transformation for measuring by transformer 2 The power of reason;Super capacitor power and current measuring device 9, connect with controller 7, pass through for measuring super capacitor The power and electric current that PWM rectifier 3 exports;Bearing power and current measuring device 10, connect, for measuring with controller 7 The power of load and the electric current of load;Super capacitor 6 is connect with PWM rectifier 3, on the one hand for storing electric energy, another party Face is for being powered load;PWM rectifier 3 is connect with transformer 2, the alternating current conversion for transformer 2 to be exported At direct current;It connect with super capacitor 6, and the direct current for exporting super capacitor is converted to alternating current;In the present embodiment In, the controller 7 respectively with PWM rectifier 3, grid power and current measuring device 8, super capacitor power and current measurement Device 9, bearing power and current measuring device 10 and top dead-centre sensor 11, bottom dead centre sensor 12 connect, and are used to control PWM rectifier 3 is to 6 charge or discharge of super capacitor;The controller 7 is connect with three-winding motor 5, for control switching three around The working condition of group motor 5.The working condition of the switch motor.It is, in the upstroke state and down stroke state of motor. In upstroke state, the three-phase electric winding that the controller 7 controls the three-winding motor 5 is connect with ac bus 4;? Down stroke stage, the three-phase generation winding that the controller 7 controls the three-winding motor 5 are connect with ac bus 4, meanwhile, The controller control 7 controls PWM rectifier 3 and charges to super capacitor 6.
Working principle in the present embodiment is:
(1) preparation stage before pumping unit starts.
In this stage, pumping unit is in lower dead point position.Start control system, controller 7 controls PWM rectifier 3 to super Grade capacitor 6 charges, after charging complete, into startup stage.
(2) pumping unit startup stage.
The work step of startup stage control system:
1) three-winding motor 5 is switched to starting winding first to meet needs when three-winding motor 5 starts by control system Big torque requirement,
2) controller 7 provides the working method of PWM rectifier 3 by judgement: when the pump load of control system measurement When less than 2 capacity of transformer, controller 7 passes through grid power and current measuring device 8, super capacitor power and current measurement dress It sets 9, bearing power and 10 feedback control of current measuring device control PWM rectifier 3 is worked in a manner of constant pressure, PWM rectifier 3 Stop powering to three-winding motor 5;When the pump load of control system measurement is greater than transformer capacity, controller 7 passes through Grid power and current measuring device 8, super capacitor power and current measuring device 9, bearing power and current measuring device 10 The information control control PWM rectifier 3 of feedback is worked in a manner of constant current, and power grid 1 passes through by transformer 2 and super capacitor 6 PWM rectifier 3 jointly powers to three-winding motor 5.In this way, power grid 1 passes through PWM rectifier by transformer 2 and super capacitor 6 3 dual power supply can realize that pump load power coordination distributes respectively with constant pressure and current constant mode cooperating, until completing to take out Oil start phased mission.
3) when control system judges that pumping unit reaches top dead-centre by top dead-centre sensor 11, pumping unit completes starting Task, pumping unit initially enter down stroke.
(3) the down stroke stage
The work step of down stroke stage control system:
1) three-winding motor 5 is switched to generating winding first by control system, and three-winding motor 5 is made to be in rated generation shape State.
2) when pumping unit is in down stroke, controller 7 provides the working method of PWM rectifier 3 by judgement: being in control Under the control of system, controller 7 passes through grid power and current measuring device 8, super capacitor power and current measuring device 9, bears It carries power and 10 feedback control of current measuring device control PWM rectifier 3 is worked in a manner of constant pressure, power grid 1 passes through transformer 2 It charges commonly through PWM rectifier 3 to super capacitor 6 with three-winding motor 5.It is reachable by control 3 charging circuit of PWM rectifier To the work of transformer 2 under rated condition.
3) when control system judges that pumping unit reaches bottom dead centre by bottom dead centre sensor 12, down stroke task is complete At pumping unit initially enters upstroke.
(4) the upstroke stage.
The work step of upstroke stage control system:
1) when pumping unit is in upstroke, three-winding motor 5 is switched to electronic winding first by control system, makes three winding Motor 5 is in specified motoring condition.
2) controller 7 provides the working method of PWM rectifier 3 by judgement: when the pump load of control system measurement When less than 2 capacity of transformer, control system passes through grid power and current measuring device 8, super capacitor power and current measurement The information control PWM rectifier 3 that device 9, bearing power and current measuring device 10 are fed back is worked in a manner of constant pressure, and PWM is whole Device 3 is flowed to stop powering to three-winding motor 5;When the pump load of control system measurement is greater than transformer capacity, controller 7 Pass through grid power and current measuring device 8, super capacitor power and current measuring device 9, bearing power and current measurement dress The information control PWM rectifier 3 for setting 10 feedbacks is worked in a manner of constant current, and power grid 1 is common by transformer 2 and PWM rectifier 3 It powers to motor.In this way, power grid 1 by dual power supply Jing Guo PWM rectifier 3 of transformer 2 and super capacitor 6 respectively with constant pressure with Current constant mode cooperating can realize that pump load power coordination distributes, and complete pumping unit upstroke phased mission.
3) when control system judges that pumping unit reaches top dead-centre by top dead-centre sensor 11, upstroke task is complete At pumping unit initially enters down stroke.
In this way, pumping unit carries out the work of upstroke and down stroke stage again and again, by using three-winding motor " low load with strong power " for solving motor existing for prior art pumping unit and transformer with super capacitor balance weight integration scenario is asked It inscribes and since mechanical system abrasion leads to balance weight problem.
In order to realize the control to above-mentioned control system, a kind of control method of pumping unit is proposed in the present embodiment, It includes the following steps:
Step A: pumping unit is in lower dead point position;
Step B: three-winding motor is switched to starting winding working condition by controller;
Step C: three-winding motor is switched to generating winding working condition by controller, and motor is in forelock electricity condition;
Step D: three-winding motor is switched to electronic winding state by controller, and motor is in specified motoring condition.
In step, controller 7 controls PWM rectifier 3 and charges to super capacitor 6, after charging complete, enters step B.
In stepb, the controller 7 provides the working method of PWM rectifier 3 by judgement, receive when controller 7 or When the pump load of measurement is less than the capacity of transformer 2, the controller 7 passes through grid power and current measuring device 8, surpasses The information control PWM rectifier 3 that grade Capacitance Power and current measuring device 9, bearing power and current measuring device 10 are fed back with The mode of constant pressure works.At this point, PWM rectifier 3 stops powering to three-winding motor 5;When the pump load that controller 7 measures When greater than 2 capacity of transformer, controller 7 passes through grid power and current measuring device 8, super capacitor power and current measurement dress The information control PWM rectifier 3 for setting 9, bearing power and the feedback of current measuring device 10 is worked in a manner of constant current, and power grid 1 passes through Transformer 2 and PWM rectifier 3 is crossed jointly to power to three-winding motor 5.Through the above steps, power grid 1 by transformer 2 and surpasses Dual power supply mode of the grade capacitor 6 Jing Guo PWM rectifier 3, realizes pumping unit respectively with constant pressure and current constant mode cooperating Bearing power coordinated allocation, until completing pumping unit startup stage task.When controller 7 is taken out by the judgement of top dead-centre sensor 11 When oil machine reaches top dead-centre, pumping unit completes starting task, and pumping unit initially enters down stroke.
In step C, pumping unit is in the down stroke stage, and equally, controller 7 provides the work of PWM rectifier 3 by judgement Mode: controller 7 passes through grid power and current measuring device 8, super capacitor power and current measuring device 9, bearing power The information control PWM rectifier 3 fed back with current measuring device 10 is worked in a manner of constant pressure, and power grid 1 passes through transformer 2 and electricity Machine charges to capacitor 6 commonly through PWM rectifier 3, and the charging circuit by controlling PWM rectifier 3 controls transformer 2 in volume Determine under state.When controller 7 judges that pumping unit reaches bottom dead centre by bottom dead centre sensor 12, down stroke task is complete At pumping unit initially enters upstroke.
In step D, pumping unit is in the upstroke stage, and controller 7 provides the work side of PWM rectifier 3 by judgement Formula: when the pump load that controller 7 measures is less than 2 capacity of transformer, controller 7 is filled by grid power and current measurement Set the information control PWM rectification that 8, super capacitor power and current measuring device 9, bearing power and current measuring device 10 are fed back Device 3 is worked in a manner of constant pressure, and PWM rectifier 3 stops powering to three-winding motor 5;When the pump load that controller 7 measures When greater than 2 capacity of transformer, controller 7 passes through grid power and current measuring device 8, super capacitor power and current measurement dress The information control PWM rectifier 3 for setting 9, bearing power and the feedback of current measuring device 10 is worked in a manner of constant current, and power grid 1 passes through Transformer 2 and PWM rectifier 3 is crossed jointly to power to three-winding motor 5.Through the above steps, power grid 1 by transformer 2 and surpasses Dual power supply of the grade capacitor 6 Jing Guo PWM rectifier 3 can realize pump load power respectively with constant pressure and current constant mode cooperating Coordinated allocation completes pumping unit upstroke phased mission.On controller 7 judges that pumping unit reaches by top dead-centre sensor 11 When dead point, upstroke task has been completed, and pumping unit initially enters down stroke.In this way, pumping unit carries out punching again and again The work of journey and down stroke stage solves prior art by using three-winding motor and super capacitor balance weight integration scenario and takes out " low load with strong power " problem of motor and transformer existing for oil machine and due to mechanical system abrasion lead to balance weight problem.
As shown in Fig. 3 and Fig. 5-7, Fig. 3 shows the control program figure in the embodiment of the present invention 1, Fig. 4 and Fig. 5 difference Show upstroke energy or power flow cardon in the present embodiment, down stroke energy stream cardon.The working principle of the present embodiment is: Referring to Fig. 3, if transformer active power of output is PT, motor load power is PL, the output power of super capacitor is PC.Online Real-time measurement transformer active power of output PTWith motor load power PL, super capacitor is exported by controlling PWM rectifier 3 Power PC(or DC current IC) to guarantee the active-power P of transformerTClose to constant.When motor load is lighter, due to this When motor load be lower than transformer rated capacity, energy needed for motor passes through control completely by power grid by transformer offer PWM rectifier 3 makes the not output power of super capacitor 6.When loading larger, measurement motor motor load power required at this time PL, utilize PLTransformer is subtracted in the rectifier active-power P of operation at ratingTIt obtains and super capacitor 6 is needed to provide at this time Power PC, make super capacitor output power P by controlling PWM rectifier 3C.Referring to fig. 4, due to when on horse head and sucker rod When rising (up stroke) oil pumping, motor is in motoring condition, and super capacitor 6 and transformer 2 are powered jointly for pumping unit, super capacitor 6 are in discharge condition.Referring to Fig. 5, when burner and sucker rod decline (down stroke), the potential energy of horse head and sucker rod is changed into dynamic It can accelerate motor that motor is made to be in generating state.Super capacitor is in charged state, and motor and transformer are super capacitor jointly Charging is that the lower stroke of pumping unit uses, as shown in Figure 4.Super capacitor is as energy-storage travelling wave tube, when down stroke, by sucker rod Gravitional force is converted into electrical energy for storage among super capacitor, and in upstroke, the electric energy and power grid of storage give motor jointly Energy supply.The recycling of the energy has been achieved.
Embodiment 2:
As shown in Fig. 2 and Fig. 4-7, a kind of control system for oil-pumping unit having frequency converter, including transformer 2, it is used for will be electric The power frequency supply or other high frequency electric sources that net 1 provides carry out transformation processing, the AC power source that output amplitude is adjusted;Further include Rectifier 13 and frequency converter 14, the rectifier 13 are connect with transformer 2, and the alternating current for transformer 2 to be exported is converted into Direct current is conveyed to frequency converter 14;Frequency converter 14, one side are connect with rectifier 13, the direct current for rectifier 13 to be exported Electricity is converted into alternating current and is conveyed to three-winding motor 5;On the other hand it is connect with two-way DC/DC converter 15, for two-way DC/ The converting direct-current power into alternating-current power that DC converter 15 exports is conveyed to three-winding motor 5;Grid power and current measuring device 8, It connect with controller 7, for measuring the power and electric current that pass through transformer 2 and carry out transformation processing;Capacitance Power and electricity Flow measuring apparatus 9 is connect with controller 7, passes through the power and electric current that rectifier 13 exports for measuring super capacitor;Load Power and current measuring device 10, connect with controller 7, for measuring the power and electric current of load;Super capacitor 6, with Two-way DC/DC converter 15 connects, on the one hand for being powered by two-way DC/DC converter 15 to super capacitor 6, another party Face, for being powered off by two-way DC/DC converter 15 to super capacitor 6.Controller 7, respectively with two-way DC/DC converter 15, grid power and current measuring device 8, super capacitor power and current measuring device 9, bearing power and current measuring device 10 connections, for controlling rectifier 13 to 6 charge or discharge of super capacitor;It is right for controlling two-way DC/DC converter 15 6 charge or discharge of super capacitor.The two-way DC/DC converter 15 includes BOOST discharge circuit and BUCK charging circuit.
Having the working principle of the control system for oil-pumping unit of frequency converter in this implementation is:
(1) preparation stage before pumping unit starts.
In this stage, pumping unit is in lower dead point position.Start control system, controller 7 controls two-way DC/DC converter 15 BUCK charging circuit charges to super capacitor 6, after charging complete, into startup stage.
(2) pumping unit startup stage.
The work step of startup stage control system:
1) three-winding motor 5 is switched to starting winding first to meet needs when three-winding motor 5 starts by control system Big torque requirement,
2) controller 7 provides the working method of two-way DC/DC converter 15 by judgement: when the oil pumping that controller 7 measures When machine load is less than 2 capacity of transformer, controller 7 passes through grid power and current measuring device 8, super capacitor power and electric current The information that measuring device 9, bearing power and current measuring device 10 are fed back controls the BOOST electric discharge of two-way DC/DC converter 15 Circuit stops electric discharge work, and power grid 1 discharges to DC bus 4 in a manner of constant pressure by transformer 2 and rectifier 13;Work as control When the pump load that device 7 measures is greater than 2 capacity of transformer, controller 7 passes through grid power and current measuring device 8, super The information that Capacitance Power and current measuring device 9, bearing power and current measuring device 10 are fed back controls two-way DC/DC converter 15 BOOST discharge circuit discharges to DC bus 4 with constant voltage mode, and power grid 1 is by transformer 2 and rectifier 13 with constant pressure Mode discharges to DC bus 4.
In this way, power grid 1 is by transformer 2 and rectifier 13 and super capacitor 6 by the double electric of two-way DC/DC converter 15 Source can realize that pump load power coordination distributes respectively with constant current and constant voltage mode cooperating, until completing pumping unit starting Phased mission.
3) when control system judges that pumping unit reaches top dead-centre by top dead-centre sensor 11, pumping unit completes starting Task, pumping unit initially enter down stroke.
(3) the down stroke stage
The work step of down stroke stage control system:
1) three-winding motor 5 is switched to generating winding first by control system, and three-winding motor 5 is made to be in rated generation shape State charges to DC bus 4 by transformer 2.
2) when pumping unit is in down stroke, controller 7 provides the working method of two-way DC/DC converter 15 by judgement: Under control of the control system, controller 7 passes through grid power and current measuring device 8, super capacitor power and current measurement The information that device 9, bearing power and current measuring device 10 are fed back control the BUCK charging circuit of two-way DC/DC converter 15 with Current constant mode charges to super capacitor 6, can reach the work of transformer 2 under rated condition by controlling BUCK charging circuit, electricity Net 1 discharges to DC bus 4 in a manner of constant pressure by transformer 2 and rectifier 13.
3) when control system judges that pumping unit reaches bottom dead centre by bottom dead centre sensing 12, down stroke task is complete At pumping unit initially enters upstroke.
(4) the upstroke stage.
The work step of upstroke stage control system:
1) when pumping unit is in upstroke, three-winding motor 5 is switched to electronic winding first by control system, makes three winding Motor 5 is in specified motoring condition.
2) controller 7 provides the working method of two-way DC/DC converter 15 by judgement: when the oil pumping of control system measurement When machine load is less than 2 capacity of transformer, controller 7 passes through grid power and current measuring device 8, super capacitor power and electric current The information that measuring device 9, bearing power and current measuring device 10 are fed back controls the BOOST electric discharge of two-way DC/DC converter 15 Circuit stops electric discharge work, and power grid 1 discharges to DC bus 4 in a manner of constant pressure by transformer 2 and rectifier 13;Work as control When the pump load of systematic survey is greater than 2 capacity of transformer, controller 7 passes through grid power and current measuring device 8, super The information that Capacitance Power and current measuring device 9, bearing power and current measuring device 10 are fed back controls two-way DC/DC converter 15 BOOST discharge circuit discharges to DC bus 4 with constant voltage mode, and power grid 1 is by transformer 2 and rectifier 13 with constant pressure Mode discharges to DC bus 4.
In this way, power grid 1 is by transformer 2 and rectifier 13 and super capacitor 6 by the double electric of two-way DC/DC converter 15 Source can realize that pump load power coordination distributes respectively with constant current and constant voltage mode cooperating, complete pumping unit upstroke rank Section task.
3) when control system judges that pumping unit reaches top dead-centre by top dead-centre sensor 11, upstroke task is complete At pumping unit initially enters down stroke.
In this way, pumping unit carries out the work of upstroke and down stroke stage again and again, by using three-winding motor " low load with strong power " for solving motor existing for prior art pumping unit and transformer with super capacitor balance weight integration scenario is asked It inscribes and since mechanical system abrasion leads to balance weight problem.
In the present embodiment, a kind of control method of pumping unit for having frequency converter is proposed comprising following steps:
Step A: pumping unit is in lower dead point position;
Step B: three-winding motor is switched to starting winding working condition by controller;
Step C: three-winding motor is switched to generating winding working condition by controller, and motor is in forelock electricity condition;
Step D: three-winding motor is switched to electronic winding state by controller, and motor is in specified motoring condition.
In step, the BUCK charging circuit that controller 7 controls two-way DC/DC converter 15 charges to capacitor 6, Requirement with the big torque needed when the starting of three-winding motor 5.
In stepb, controller 7 provides the working method of two-way DC/DC converter 15 by judgement: when control system is surveyed When the pump load of amount is less than 2 capacity of transformer, power and electric current that controller 7 passes through power grid 1, super capacitor 6 and load The BOOST discharge circuit that the information that measurement links 8,9,10 are fed back controls two-way DC/DC converter 15 stops electric discharge work, power grid 1 discharges to DC bus 4 in a manner of constant pressure by transformer 2 and rectifier 13;When the pump load of control system measurement When greater than 2 capacity of transformer, controller 7 passes through grid power and current measuring device 8, super capacitor power and current measurement dress Set the information that 9, bearing power and current measuring device 10 are fed back control the BOOST discharge circuit of two-way DC/DC converter 15 with Constant voltage mode discharges to DC bus, and power grid 1 discharges to DC bus 4 in a manner of constant pressure by transformer 2 and rectifier 13.
In this way, power grid 1 is by transformer 2 and rectifier 13 and super capacitor 6 by the double electric of two-way DC/DC converter 15 Source can realize that pump load power coordination distributes respectively with constant current and constant voltage mode cooperating, until completing pumping unit starting Phased mission.When control system judges that pumping unit reaches top dead-centre by top dead-centre sensor 11, pumping unit completes starting Task, pumping unit initially enter down stroke.
In step C, for oil machine in down stroke, control system provides the work of two-way DC/DC converter 15 by judgement Mode: motor is switched to generating winding first by control system, so that motor is in rated generation state, by frequency converter 14 to straight Bus 4 is flowed to charge.Under control of the controller 7, controller 7 passes through grid power and current measuring device 8, super capacitor power The BUCK of two-way DC/DC converter 15 is controlled with the information of current measuring device 9, bearing power and current measuring device 10 feedback Charging circuit charges to super capacitor 6 with current constant mode, reaches the work of transformer 2 in specified shape by controlling BUCK charging circuit Under state, power grid 1 discharges to DC bus 4 in a manner of constant pressure by transformer 2 and rectifier 13.Controller is passed by bottom dead centre When sensor 12 judges that pumping unit reaches bottom dead centre, down stroke task has been completed, and pumping unit initially enters upstroke.
In step D, control system provides the working method of transformer 2 and two-way DC/DC converter 15 by judgement: when When the pump load of control system measurement is less than 2 capacity of transformer, controller 7 by grid power and current measuring device 8, The information that super capacitor power and current measuring device 9, bearing power and current measuring device 10 are fed back controls two-way DC/DC and becomes The BOOST discharge circuit of parallel operation 15 stops electric discharge work, and power grid 1 is by transformer 2 and rectifier 13 to straight in a manner of constant pressure Bus 4 is flowed to discharge;When the pump load of control system measurement is greater than 2 capacity of transformer, controller 7 by grid power and The information that current measuring device 8, super capacitor power and current measuring device 9, bearing power and current measuring device 10 are fed back It controls the BOOST discharge circuit of two-way DC/DC converter 15 to discharge to DC bus 4 with constant voltage mode, power grid 1 passes through transformer 2 and rectifier 13 in a manner of constant pressure to DC bus 4 discharge.
The working principle of the present embodiment is: power grid 1 passes through two-way DC/ by transformer 2 and rectifier 13 and super capacitor 6 The dual power supply of DC converter 15 can realize that pump load power coordination distributes respectively with constant current and constant voltage mode cooperating, complete At pumping unit upstroke phased mission.When top dead-centre sensor 11 judges that pumping unit reaches top dead-centre, upstroke task is It completes, pumping unit initially enters down stroke.And so on, pumping unit carries out the work of upstroke and down stroke stage again and again Make, solves motor and change existing for prior art pumping unit by using three-winding motor and super capacitor balance weight integration scenario " low load with strong power " problem of depressor and due to mechanical system abrasion lead to balance weight problem.
Referring again to shown in Fig. 2-5, Fig. 2 shows the schematic diagrams for the control system that frequency converter is had in the present embodiment.If 13 direct current active power of rectifier is PT(or DC current IT), motor DC bearing power is PL, the direct current function of super capacitor 6 Rate is PC.On-line sampling system rectifier active-power PT(or DC current IT) and motor DC bearing power be PL, pass through control Make the power P that the BOOST circuit of two-way DC/DC converter 15 exports super capacitor 6C(or DC current IC) to guarantee to rectify The active-power P of device outputT(or DC current IT) close to constant.When motor load is lighter, since motor load is lower than at this time Transformer rated capacity, energy needed for motor are provided by power grid by transformer completely, pass through the two-way DC/DC converter of control 15 make the not output power of super capacitor 6.When loading larger, measurement motor motor load power P required at this timeL, utilize PLSubtract Go transformer in the rectifier DC active-power P of operation at ratingTObtain the power for needing super capacitor 6 to provide at this time PC, 6 output power P of super capacitor is made by the BOOST circuit of the two-way DC/DC converter 15 of controlC.As Fig. 4 and Fig. 5 are shown , the energy flow graph of upstroke and down stroke in the present embodiment.Due to when horse head and sucker rod rise (up stroke) oil pumping, Three-winding motor 5 is in motoring condition, and super capacitor 6 is in discharge condition, powers jointly for pumping-unit motor with transformer 2.
When horse head and sucker rod decline (down stroke), the potential energy of horse head and sucker rod is changed into kinetic energy and motor is accelerated to make electricity Machine is in generating state.Super capacitor 6 is in charged state, and motor and transformer 2 charge jointly for super capacitor 6, for oil pumping The lower stroke of machine uses.Super capacitor is as energy-storage travelling wave tube, when down stroke, converts electric energy for the gravitional force of sucker rod and stores up There are among super capacitor, in upstroke, the electric energy and power grid of storage are energized to motor jointly.Returning for the energy has been achieved It receives and utilizes.
Fig. 6 is the schematic construction of the three-winding motor in the present invention.Wherein, stator a, b, c three-phase, a1、a2、a3For A phase Three sets of windings in stator axis, b1、b2、b3For three sets of windings in B phase stator axis, c1、c2、c3For three sets in C phase stator axis Winding, equipped with switch, i.e. a on the double winding of three sets of windings of every phase2And a3Winding is respectively provided with a switch Ka1And Ka2, b2 And b3Winding is respectively provided with a switch Kb1And Kb2, c2And c3Winding is respectively provided with a switch Kc1And Kc2.By different The switching of switch state meets the needs of under different conditions, herein by three sets of winding parallels, by taking A phase as an example, and under generating state, Ka1And Ka2It disconnects, at this time only a1Winding accesses motor;When electronic (when upstroke) state of pumping unit, Ka1It connects, Ka2It is disconnected It opens, at this time a1And a2Stator winding in parallel as motor;Work as a1、a2And a3When winding is the power supply of pumping unit starting state jointly, Ka1And Ka2It connects, a1、a2And a3Three sets of winding parallels as motor at this time stator winding to meet starting when biggish torque Demand.B phase and C phase connection are the same as A phase.
(2) optimization problem of capacitor transformer capacity:
Since pumping-unit motor startup power and normal operation power difference are larger, starting rank in the past in order to meet motor Torque big technical requirements when section, need the biggish motor of equipped capacitor, but result in motor under normal operation It cannot be run with fully loaded capacity, further transformer can not be fully loaded with fortune when operating normally to cooperate the capacity of motor Row, this has resulted in the presence of " low load with strong power " phenomenon of transformer.The pumping unit of conventionally employed mechanical counterweight device exists Another accessory problem is supply transformer, since the load factor of motor changes and cannot be worked in full load condition.Pumping unit opens Biggish inertial load is overcome when dynamic, once and equipment starts up, its own need power significantly reduce again, as a result make House transformer is more much smaller than itself starting rated power when motor is worked normally, and leads to the load factor mistake of transformer in this way It is low.Therefore, super capacitor energy-storage type pumping unit solves the problems, such as this using super capacitor energy,.Further, in order to mention Height makes well site transformer work in the efficiency in upper and lower stroke starting, promotion and decentralization process in pumping-unit motor, makes It, works in a determining range, to establish the well site transformer capacity Selection Model of an optimization, as shown in Equation 1.
The smallest objective function of the upper and lower stroke capacity difference of well site transformer:
MinF (x)=Δ P=Pup-Pdown (1)
Super capacitor power constraint: PCmin≤PC≤PCmax
Busbar voltage scleronomic constraint: UBus min≤UBus≤UBus max
Power of motor limits constraint: PMup≤Pup+PC
PMdown≤Pdown+PC
PMotor≤UBus·IBus
Load -- the constraint of motor speed characteristic: pass through formulaM=GLoadR is available theoretic negative It carries and turns with motor speed characteristic and the load-motor surveyed in workover rig load characteristic test platform Fast characteristic curve codetermines the constraint relationship.
Super capacitor operating voltage constraint: USuper capacitor min≤USuper capacitor≤USuper capacitor max
Wherein, stroke difference power, P above and below the transformer of the well site Δ P--up-- shape journey output power on the transformer of well site, Pdown-- shape journey output power, P under the transformer of well siteC-- super capacitor output power, PMup-- motor up stroke output power, PMdown-- motor down stroke output power, UBus-- busbar voltage, IBus-- bus current, n-- motor speed, M-- motor turn Square, GLoad-- load gravity, the R-- motor arm of force, USuper capacitor-- super-capacitor voltage.
It is solved using former antithesis nonlinear interior-point method, equation is converted for inequality constraints by slack variable first Constraint introduces logarithm barrier function in objective function to handle the nonnegativity restriction of slack variable, then forms Lagrange Function is derived the KKT condition (Karush Kuhn Tucker optimal condition) of Lagrangian, is asked using Newton iterative method Solution obtains optimal solution, finds the real-time optimum operating speed transformer capacity of the system, to improve the work effect of whole system Rate and economy.The above is only the preferred embodiment of the present invention, is not intended to limit the present invention in any form, all Any simple modification, equivalent change and modification to the above embodiments according to the technical essence of the invention still fall within this In the range of inventive technique scheme.
After having read this specification, those skilled in the art are not difficult to find out, the present invention is bonded by the prior art, this Constitute a bit each section of the invention the prior art some give detailed description herein, some then for specification concisely consider Do not repeat all matters, big and small, but those skilled in the art read specification after just know institute's cloud.And those skilled in the art Also it is not difficult to find out that, it is to be full of a large amount of creative works to the combination of these prior arts to constitute the present invention, is that inventor is more The crystallization of year theory analysis and many experiments.Those skilled in the art can equally find out from specification, described herein Any combination of each technical solution and each feature belongs to a part of the invention.

Claims (21)

1. a kind of control system for oil-pumping unit of no frequency converter, it is characterised in that: including transformer, connect with power grid, being used for will The power frequency supply or other high frequency electric sources that power grid provides carry out transformation processing, the AC power source that output amplitude is adjusted;
Grid power and current measuring device, connect with controller, for measuring the electricity for passing through transformer and carrying out transformation processing Source power and electric current;
Super capacitor power and current measuring device, connect with controller, for measuring super capacitor after PWM rectifier The power and electric current of output;
Bearing power and current measuring device, connect with controller, for measuring the power and electric current of three-winding motor;
Super capacitor is connect with PWM rectifier, on the one hand for storing electric energy, on the other hand for three-winding motor into Row power supply;
PWM rectifier is connect with transformer, and the alternating current for transformer to be exported is converted into direct current;Itself and super electricity Hold connection, the direct current for exporting super capacitor is converted to alternating current;
Controller is filled with PWM rectifier, grid power and current measuring device, super capacitor power and current measurement respectively Set, bearing power is connected with current measuring device, top dead-centre sensor, bottom dead centre sensor, be used to control PWM rectifier pair Super capacitor charge or discharge;
Three-winding motor is connect with the sucker rod of the output end of transformer and pumping unit respectively;
The three-winding motor is that three sets of windings are inlaid in the stator slot of the motor: a set of three-phase starting winding, a set of Three-phase electric winding and a set of three-phase generation winding.
2. as described in claim 1 without the control system for oil-pumping unit of frequency converter, it is characterised in that: controller and three-winding motor Connection, for controlling the working condition of switching three-winding motor.
3. as described in claim 1 without the control system for oil-pumping unit of frequency converter, it is characterised in that: during startup, described The three-phase starting winding that controller controls the three-winding motor is connect with ac bus.
4. as described in claim 1 without the control system for oil-pumping unit of frequency converter, it is characterised in that: described in the upstroke stage The three-phase electric winding that controller controls the three-winding motor is connect with ac bus.
5. as described in claim 1 without the control system for oil-pumping unit of frequency converter, it is characterised in that: described in the down stroke stage The three-phase generation winding that controller controls the three-winding motor is connect with ac bus.
6. the control method without frequency converter control system for oil-pumping unit, which is used for The control system for oil-pumping unit of no frequency converter of any of claims 1-5, it is characterised in that: include the following steps,
Step A: pumping unit is in lower dead point position;
Step B: three-winding motor is switched to starting winding working condition by controller, after pumping unit completes starting task, is taken out Oil machine is in upper dead center position, and pumping unit initially enters down stroke;
Step C: for pumping unit in the down stroke stage, three-winding motor is switched to generating winding working condition by controller, at motor In rated generation state;After the completion of down stroke task, pumping unit is in lower dead point position, and pumping unit initially enters upstroke;
Step D: pumping unit is in the upstroke stage, and three-winding motor is switched to electronic winding state, three winding electricity by controller Machine is in specified motoring condition;After the completion of upstroke task, pumping unit is in upper dead center position;Pumping unit initially enters undershoot Journey;And so on, pumping unit carries out the work of upstroke and down stroke stage again and again.
7. the control method as claimed in claim 6 without frequency converter control system for oil-pumping unit, it is characterised in that: in step, Controller controls PWM rectifier and charges to super capacitor.
8. the control method as claimed in claim 6 without frequency converter control system for oil-pumping unit, it is characterised in that: in stepb, Controller provides the working method of PWM rectifier by judgement: when the pump load of controller measurement is less than transformer capacity When, controller passes through grid power and current measuring device, super capacitor power and current measuring device, bearing power and electric current The information control PWM rectifier of measuring device feedback is worked in a manner of constant pressure, at this point, PWM rectifier stops to three winding electricity Machine power supply;When the pump load of controller measurement is greater than transformer capacity, controller passes through grid power and current measurement The information of device, super capacitor power and current measuring device, bearing power and current measuring device feedback controls PWM rectifier It is worked in a manner of constant current, power grid jointly powers to three-winding motor by PWM rectifier by transformer and super capacitor.
9. the control method as claimed in claim 6 without frequency converter control system for oil-pumping unit, it is characterised in that: in step C, For pumping unit in down stroke, controller provides the working method of PWM rectifier by judgement: controller passes through grid power and electricity The information of flow measuring apparatus, super capacitor power and current measuring device, bearing power and current measuring device feedback controls PWM Rectifier is worked in a manner of constant pressure, and power grid charges to super capacitor commonly through PWM rectifier by transformer and motor, is led to The charging circuit for crossing control PWM rectifier controls transformer under rated condition.
10. the control method as claimed in claim 6 without frequency converter control system for oil-pumping unit, it is characterised in that: in step D In, controller provides the working method of PWM rectifier by judgement: when the pump load of controller measurement is held less than transformer When amount, controller passes through grid power and current measuring device, super capacitor power and current measuring device, bearing power and electricity The information control PWM rectifier of flow measuring apparatus feedback is worked in a manner of constant pressure, and PWM rectifier stops supplying three-winding motor Electricity;When the pump load of controller measurement is greater than transformer capacity, controller by grid power and current measuring device, The information control PWM rectifier of super capacitor power and current measuring device, bearing power and current measuring device feedback is with perseverance The mode of stream works, and power grid jointly powers to three-winding motor by PWM rectifier by transformer and super capacitor.
11. a kind of control system for oil-pumping unit for having frequency converter, it is characterised in that: including transformer, connect with power grid, being used for will The power frequency supply or other high frequency electric sources that power grid provides carry out transformation processing, the AC power source that output amplitude is adjusted;
Grid power and current measuring device, connect with controller, for measuring the electricity for passing through transformer and carrying out transformation processing Source power and electric current;
Super capacitor power and current measuring device, connect with controller, for measuring super capacitor after PWM rectifier The power and electric current of output;
Bearing power and current measuring device, connect with controller, for measuring the power and electric current of three-winding motor;
Rectifier is connect with transformer, and the alternating current for transformer to be exported is converted into direct current and is conveyed to frequency converter;
Frequency converter, one side are connect with rectifier, and the converting direct-current power into alternating-current power for rectifier to be exported is conveyed to three Winding electric machine;On the other hand it is connect with two-way DC/DC converter, the direct current conversion for two-way DC/DC converter to be exported Three-winding motor is conveyed at alternating current;
Two-way DC/DC converter, one side connect with rectifier and frequency converter, on the other hand connect with super capacitor, be used for Control the charge and discharge of super capacitor;
Super capacitor is connect with two-way DC/DC converter, on the one hand for storing electric energy, on the other hand for three winding Motor is powered;
Controller, respectively with two-way DC/DC converter, grid power and current measuring device, super capacitor power and electric current Measuring device, bearing power and current measuring device, top dead-centre sensor, bottom dead centre sensor connect, for controlling two-way DC/ DC converter is to super capacitor charge or discharge;
Three-winding motor is connect with the sucker rod of the output end of frequency converter and pumping unit respectively;
The three-winding motor is that three sets of windings are inlaid in the stator slot of the motor: a set of three-phase starting winding, a set of Three-phase electric winding and a set of three-phase generation winding.
12. there is the control system for oil-pumping unit of frequency converter as claimed in claim 11, it is characterised in that: the two-way DC/DC becomes Parallel operation includes BOOST discharge circuit and BUCK charging circuit.
13. there is the control system for oil-pumping unit of frequency converter as claimed in claim 11, it is characterised in that: controller and three winding electricity Machine connection, for controlling the working condition of switching three-winding motor.
14. there is the control system for oil-pumping unit of frequency converter as claimed in claim 11, it is characterised in that: during startup, institute State controller control the three-winding motor three-phase starting winding connect with frequency converter.
15. there is the control system for oil-pumping unit of frequency converter as claimed in claim 11, it is characterised in that: in the upstroke stage, institute It states controller and controls the three-phase electric winding of the three-winding motor and connect with frequency converter.
16. there is the control system for oil-pumping unit of frequency converter as claimed in claim 11, it is characterised in that: in the down stroke stage, institute It states controller and controls the three-phase generation winding of the three-winding motor and connect with frequency converter.
17. there is the control method of frequency converter control system for oil-pumping unit, this has the control method of frequency converter control system for oil-pumping unit to use The control system for oil-pumping unit for having frequency converter described in any one of claim 11-16, it is characterised in that: including walking as follows Suddenly,
Step A: pumping unit is in lower dead point position;
Step B: three-winding motor is switched to starting winding working condition by controller, after pumping unit completes starting task, is taken out Oil machine is in upper dead center position, and pumping unit initially enters down stroke;
Step C: for pumping unit in down stroke, three-winding motor is switched to generating winding working condition by controller, and motor is in Rated generation state;After the completion of down stroke task, pumping unit is in lower dead point position;Pumping unit initially enters upstroke;
Step D: for pumping unit in upstroke, three-winding motor is switched to electronic winding state by controller, at three-winding motor In specified motoring condition;After the completion of upstroke task, pumping unit is in upper dead center position;Pumping unit initially enters down stroke;Such as This is reciprocal, and pumping unit carries out the work of upstroke and down stroke stage again and again.
18. there is the control method of frequency converter control system for oil-pumping unit as claimed in claim 17, it is characterised in that: in step A In, controller controls the BUCK charging circuit of two-way DC/DC converter to capacitor charging.
19. there is the control method of frequency converter control system for oil-pumping unit as claimed in claim 17, it is characterised in that: in step B In, controller provides the working method of two-way DC/DC converter by judgement: becoming when the pump load of controller measurement is less than When depressor capacity, controller passes through grid power and current measuring device, super capacitor power and current measuring device, load function The BOOST discharge circuit that the information of rate and current measuring device feedback controls two-way DC/DC converter stops electric discharge work, power grid It is discharged with constant voltage mode DC bus by transformer and rectifier;When the pump load of controller measurement is greater than transformer When capacity, controller by grid power and current measuring device, super capacitor power and current measuring device, bearing power and The information of current measuring device feedback controls the BOOST discharge circuit of two-way DC/DC converter with constant voltage mode to DC bus Electric discharge, power grid discharge to DC bus in a manner of constant pressure by transformer and rectifier.
20. there is the control method of frequency converter control system for oil-pumping unit as claimed in claim 17, it is characterised in that: in step C In, for oil machine in down stroke, controller provides the working method of two-way DC/DC converter by judgement: in the control of controller Under, controller passes through grid power and current measuring device, super capacitor power and current measuring device, bearing power and electric current The information of measuring device feedback is controlled the BUCK charging circuit of two-way DC/DC converter and is charged with current constant mode to super capacitor, Reach transformer work under rated condition by controlling BUCK charging circuit, power grid is by transformer and rectifier with constant pressure Mode discharges to DC bus.
21. there is the control method of frequency converter control system for oil-pumping unit as claimed in claim 17, it is characterised in that: in step D In, controller provides the working method of two-way DC/DC converter by judgement: becoming when the pump load of controller measurement is less than When depressor capacity, controller passes through grid power and current measuring device, super capacitor power and current measuring device, load function The BOOST discharge circuit that the management information system of rate and current measuring device feedback controls two-way DC/DC converter stops electric discharge Work, power grid discharge to DC bus in a manner of constant pressure by transformer and rectifier;When the pumping unit of controller measurement is negative When carrying greater than transformer capacity, controller passes through grid power and current measuring device, super capacitor power and current measurement dress It sets, the information of bearing power and current measuring device feedback controls the BOOST discharge circuit of two-way DC/DC converter with constant pressure side Formula discharges to DC bus, and power grid discharges to DC bus in a manner of constant pressure by transformer and rectifier.
CN201510460693.7A 2015-07-30 2015-07-30 The control system and its control method of pumping unit Expired - Fee Related CN105119311B (en)

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CN109950963A (en) * 2019-03-14 2019-06-28 成都凹克新能源科技有限公司 A kind of high direct voltage kowtowing machine automatic energy saving system based on supercapacitor
CN112366754B (en) * 2021-01-13 2021-05-07 天津民昌科技有限公司 Multi-winding motor self-power-generation micro-grid system for oil pumping unit

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