CN1688100A - Controlling method and apparatus of discontinuous power supply combined with star angle converting for motor of pumping unit - Google Patents
Controlling method and apparatus of discontinuous power supply combined with star angle converting for motor of pumping unit Download PDFInfo
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- CN1688100A CN1688100A CNA2005100679935A CN200510067993A CN1688100A CN 1688100 A CN1688100 A CN 1688100A CN A2005100679935 A CNA2005100679935 A CN A2005100679935A CN 200510067993 A CN200510067993 A CN 200510067993A CN 1688100 A CN1688100 A CN 1688100A
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Abstract
This invention discloses a control method for the discontinuous supply of a motor of a pumping unit combining star-angle transformation including: judging if the motor can be star-joint at heavy load, setting the cut off operation way to be a star-joint or an angle-joint, starting it with angle-joint, collecting the power curves of the motor to determine the cut-off position at the switched-on operation, switching the motor to the discontinuous supply operation in terms of said set cut-off operation ways at the cut-off time, testing the rotation speed of the motor to judge if it's necessary to switch-on, if not, continuing the test, if so, converting it to the switch-on operation at a proper position. This invention also discloses a control method for dynamic star-angle transformation and a control device for discontinuous supply combing star-angle transformation.
Description
Technical field
The present invention relates to the control technology of motor of oil extractor, particularly relate to a kind of control method and device of discontinuous power supply combined with star angle converting for motor of pumping unit.
Background technology
The oil pumper major part that use in present oil field is a beam pumping unit, and it is a kind of typical periodic load, and peak load and minimum load differ greatly in the running.For overcoming the static load moment in the starting process, when the apolegamy capacity motor, the general all overcapacity motor coupling that employing is bigger.Yet in oil pumper when operation,, average load has only the about 30% of motor rated output power, the waste of energy phenomenon of serious " low load with strong power " occurs.Along with electricity price rises steadily, in order to reduce cost for oil production, need to study efficient and the saves energy consumption that how to improve pumping unit apparatus, this problem has great significance.
In the prior art, the electricity-saving controller that the pumping motor in fuel feeding field uses has a variety of, but power savings all is difficult to surpass 15%.
Name in applicant's application is called in the application for a patent for invention of " motor of beam-pumping unit discontinuous power supply full-automatic controlling method and device ", a kind of energy-saving control method of oil pumping machine of novelty is provided, be the discontinuous power supply control method, surpass 20% for some oil pumper power saving rate.
So-called discontinuous power supply operational mode is meant that oil pumper a mechanical duty cycle (generally from several seconds by tens of seconds), is to belong to the outage running status for some time.Usually power-off time can reach 20-60%.Under the outage running status, oil pumper mainly leans on potential energy release and action of inertia and works on, and motor does not consume any electric energy.After finishing, the outage running status switches on operation a period of time again, circulation successively again, and motor of oil extractor just is in the discontinuous power supply running status that energising one outage replaces.In a Machine cycle from the upstroke to the down stroke, has the power process of switching on once or twice.
In the prior art, the variable star angle power-saving technology of asynchronous machine is of long duration, motor when iron loss approximately is corner connection when star connects iron loss 1/3; For specific lower load factor, the copper loss when copper loss was also than corner connection when star connect lacks, and power saving rate can reach more than 10%.When load factor was higher than certain critical point, the copper loss of the rotor copper loss that the motor star connects during not only greater than corner connection, and surpass the saving of iron loss, this clock star connect to be compared not energy-conservationly with corner connection, and star scoops out and is transformed to the corner connection operation.
But, in variable star angle moment, the size and Orientation of motor flux all changes, and general handover operation can make electric current and mechanical aspects that very big impact is all arranged, therefore near load factor frequent situation about changing critical point, carrying out variable star angle frequently will have certain problem.
In addition, also do not take all factors into consideration the technical scheme in conjunction with problem of discontinuous power supply control method and variable star angle power-saving technology in the prior art.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of control method and device of discontinuous power supply combined with star angle converting for motor of pumping unit, can further excavate the energy-saving potential of oil pumper, makes motor run on the preferable discontinuous power supply running status of energy-saving effect.
For this reason, technical scheme of the present invention is: a kind of control method of discontinuous power supply combined with star angle converting for motor of pumping unit is provided, comprises step:
1) judge that motor could connect by star when heavy duty, it is that star connects or corner connection outage operational mode that the outage operational mode is set;
2) the motor corner connection starts;
3) under the energising operational mode, gather the power of electric motor curve, determine de-energized;
4) in de-energized constantly, connect or corner connection outage operational mode switches to the discontinuous power supply operation with motor according to the star of aforementioned setting;
5) rotating speed of detection motor need to judge whether energising, if not, then continues to detect; If then enter step 6);
6) be converted to the energising operation in the position of suitable energising.
Preferably, in described step 3) and 4) between also comprise: detect whether the operation that switches to power save mode is arranged, if not, conventional operation then; If then enter step 4); Whether also comprise between described step 5) and step 6): detecting has the operation that switches to conventional state, if then switch to conventional corner connection operation; If not, then enter step 6).
The step that also comprises the contactor interlocking when preferably, star connects with the corner connection conversion.
Preferably, the mode of adopt outage in the described step 4), switching, switch on realizes the nothing impact of variable star angle process.
Preferably, the switching in the described step 4) specifically comprises: the control main contactor disconnects, and switches to the discontinuous power supply operation, and controllable silicon is stopped paying out pulse, the auxiliary contactor closure; The conversion of described step 6) specifically is by the back energising operation of the soft input of controllable silicon.
The present invention provides a kind of control method of discontinuous power supply combined with star angle converting for motor of pumping unit in addition, comprises step:
21) the conventional corner connection of motor starts;
22) gather the power of electric motor curve, determine de-energized;
23) under the energising operational mode, relatively power curve and the motor parameter of heavy duty energising period determine that the outage operational mode is that star connects operation or corner connection operation;
24) in de-energized constantly, connect or corner connection outage operational mode switches to the discontinuous power supply operation with motor according to aforementioned definite star;
25) rotating speed of detection motor need to judge whether energising, if not, then continues to detect; If then enter step 26);
26) be converted to the energising operation in the position of suitable energising.
Preferably, in described step 22) and 23) between also comprise: detect whether the operation that switches to power save mode is arranged, if not, conventional operation then; If then enter step 23); In described step 25) and step 26) between also comprise: detect whether the operation that switches to conventional state is arranged, if then switch to conventional corner connection operation; If not, then enter step 6).
The step that also comprises the contactor interlocking when preferably, star connects with the corner connection conversion.
Preferably, adopt outage described step 24), switch, the mode of energising again realizes that the nothing of variable star angle process impacts
Preferably, described step 24) switching in specifically comprises: if corner connection outage operational mode, then with the normally-closed contact closure of second relay, its normally opened contact disconnects the coil of the 3rd contactor, the 3rd contactor is in off-state, its normally-closed contact closure, so the coil electricity of second contactor, the corner connection auxiliary contactor is closed to be the corner connection mode; If star connects the outage operational mode, with the normally-closed contact disconnection of second relay, its normally opened contact is closed simultaneously to disconnect second contactor coil, second contactor disconnects, its normally-closed contact closure, the coil of conducting the 3rd contactor, star connects the auxiliary contactor closure and connects mode for star; Described step 26) conversion specifically is by the back energising operation of the soft input of controllable silicon.
The present invention also provides a kind of control device of discontinuous power supply combined with star angle converting for motor of pumping unit, comprising:
Switch element comprises controllable silicon and contactor on the main power source input circuit that is connected motor, is used to control the on/off and the winding connection mode of motor;
Trigger performance element, connect described controllable silicon, carry out the silicon controlled conducting or turn-off control;
Driver element connects described contactor, the break-make of control contactor;
Data acquisition unit is connected with the electric power loop of motor, is used for extracting when powering continuously voltage and current instantaneous value;
Microcomputer control unit, the input signal end connects the signal output part of described data acquisition unit, and output connects triggering performance element and driver element; Be used to obtain the power of electric motor curve, determine the de-energized and the moment, and judge and to connect operation by star; Continue to extract voltage and current instantaneous value in the power up phase of discontinuous power supply, as the calculated value of protection with compare with reference to definite value, can continue judgement simultaneously connect operation by star; In the outage operation phase,, send signal in good time and motor is carried out soft input control for the triggering performance element according to the rotating speed of motor.
Preferably, star connects with the contactor of corner connection and driver element secondary circuit thereof and adopts the interlocking-type design, is used for preventing during the variable star angle and the control procedure main circuit is short-circuited.
Preferably, also comprise the by-pass switch that is used to switch conventional operation and energy-saving run state.
Compare with the electricity-saving controller and the control method of existing pumping motor, the invention has the beneficial effects as follows: the present invention both can realize the control of motor of beam-pumping unit discontinuous power supply, can realize variable star angle according to oil well condition again, further development of latent energy-saving potential.The data that microcomputer control unit is gathered at data acquisition unit, determine energising and power-cut time, judge that star connects or the corner connection operational mode, by triggering performance element and driver element switch element is controlled in real time effectively, made motor run on the discontinuous power supply running status of energy-saving effect the best.That is to say, by data acquisition unit measuring unit identification oil pumper operating mode, microcomputer control unit is judged control mode, determine the definite value parameter and can adjust parameter in real time, finally by controllable silicon and triggering performance element and contactor and driver element enforcement Energy Saving Control thereof according to the change of operating mode.
In addition; in preferred version of the present invention; for preventing the shutdown that meets accident in the whole discontinuous power supply process; this control device has designed lost-control protection; in energy-saving control loop, go wrong and shut down or during irregular operating; automatically switch to the conventional operation mode, and be provided with the bypass change over switch that manual switchover is the conventional operation state.
In preferred version of the present invention, for preventing the short circuit that meets accident in the variable star angle process, star connects the design of having adopted interlocking-type with the contactor of corner connection.
Field experiment proves, the power-saving control method of application discontinuous power supply combined with star angle converting for motor of pumping unit and device are for most of oil pumpers, meritorious power saving rate is generally in 15%～30% scope, generally in 30%～70% scope, the integrated power-saving rate can reach 20～40% to idle power saving rate.
Description of drawings
Fig. 1 is the general function block diagram of energy-saving control device of the present invention.
Fig. 2 is the flow chart of static variable star angle control method among the present invention.
Fig. 3 is the flow chart of dynamic variable star angle control method among the present invention.
Fig. 4 is the connection layout of data acquisition unit and microcomputer control unit in the example of the present invention.
Fig. 5 is the main circuit connection figure of static variable star angle in the example of the present invention.
Fig. 6 is that static variable star angle drives loop interlocking principle figure in the example of the present invention.
Fig. 7 is a static variable star angle control method flow chart in the example of the present invention.
Fig. 8 is the main circuit connection figure of dynamic variable star angle in the example of the present invention.
Fig. 9 is that dynamic variable star angle drives loop interlocking principle figure in the example of the present invention.
Figure 10 is a dynamic variable star angle control method flow chart in the example of the present invention.
Embodiment
Main design of the present invention is: oil well or the frequent oil well that changes of load for some low load factor on the basis of discontinuous power supply control technology, can further improve the power saving rate of oil pumper in conjunction with the method for variable star angle.Specifically, the present invention is according to the cyclic variation of oil pumper load, by bidirectional thyristor or antiparallel controllable silicon, control in real time under the operational mode that motor works in discontinuous power supply, and change the winding connection method of motor according to operating mode, farthest reduce the loss of motor, realize the electric energy-saving of oil pumper effectively.
Among the present invention, so-called discontinuous power supply operational mode is meant that oil pumper a mechanical duty cycle (generally from several seconds to tens of second), is to belong to the outage running status for some time.Usually power-off time can reach 20-60%.Under the outage running status, oil pumper mainly leans on potential energy release and action of inertia and works on, and motor does not consume any electric energy.After finishing, the outage running status switches on operation a period of time again, circulation successively again, and motor of oil extractor just is in the discontinuous power supply running status that energising one outage replaces.In a Machine cycle from the upstroke to the down stroke, has the power process of switching on once or twice.
Variable star angle under the so-called discontinuous power supply operational mode is meant the winding method of attachment employing angle type connection of motor in the start-up course of continuous electricity consumption, and the energising period in discontinuous power supply is adopted static variable star angle (wye connection) or dynamic variable star angle (star-like and angle type connection dynamically replaces according to operating mode).When electric motor starting, by main contactor corner connection starting, its reason is to change distance in order to satisfy bigger starting; Be underloading and unloaded situation during switching on, the loss of electric machine of wye connection reduces significantly, and the electrical machine energy-saving effect has further raising.
See also Fig. 1, electricity-saving control device of the present invention is applied to motor of beam-pumping unit, can realize the Energy Saving Control of discontinuous power supply combined with star angle converting.This electricity-saving controller comprises data acquisition unit 110, microcomputer control unit 120, triggers performance element 130, driver element 140 and switch element.
Switch element comprises air circuit (figure does not show), antiparallel reverse-blocking tetrode thyristor 151 and the contactor 152 on the main power source input circuit that is connected motor 900.
During work, the instantaneous value of the voltage and current when described data acquisition unit 110 is gathered motor 900 operations.
Can described microcomputer control unit 120 extracts voltage and current instantaneous value when powering continuously, by the power curve that calculates, determine the de-energized and the moment, and judge and connect operation by star; Continue to extract voltage and current instantaneous value in the power up phase of discontinuous power supply, as the calculated value of protection with compare with reference to definite value, can continue judgement simultaneously connect operation by star; In the outage operation phase,, send signal in good time and carry out soft input control for 130 pairs of motor of triggering performance element 900 according to the rotating speed of speed detection unit (figure does not show) detection motor 900.
Described triggering performance element 130 receives the control signal of microcomputer control unit 120, produces trigger impulse, carries out the conducting of controllable silicon 151 or turn-offs control.
Described driver element 140 receives the control signal of microcomputer control unit, the break-make of control contactor.
In a word; according to the open-air unattended requirement of beam pumping unit; in line with safety, reasonable, reliable principle; consider and prevent the oil pumper hang-up and prevent the variable star angle problem of short-circuit; electricity-saving control device of the present invention can detect voltage, electric current; identification oil pumper power curve is determined operational mode according to operating mode in real time.Have novel structure, reasonable, degree of protection advantages of higher, and each is unit-modularized, Installation and Debugging, maintenance and maintenance are convenient.
See also Fig. 2 and Fig. 3, introduce the flow process of the power-saving control method of discontinuous power supply combined with star angle converting for motor of pumping unit of the present invention below.
In the power-saving control method of the present invention, according to the actual conditions of motor of oil extractor, variable star angle comprises static variable star angle and dynamic variable star angle.
In the oil field, some oil well is in the state of low load with strong power basically for a long time, if can be by measuring the power curve that calculates in any data acquisition unit, the motor star connect the commentaries on classics of operation apart from whether enough when the judgement of off-line ground was the most heavily loaded, and whether calculating during switching on star, to connect the loss more total than corner connection little, determine also to connect operation by star when the most heavily loaded, then can adopt the mode of static variable star angle, being permanently connected with the brace that links to each other with controllable silicon in the device is wye connection.For static variable star angle, after the contactor corner connection startup, the identification de-energized can automatically switch to star and connect under electricity and the outage DCM Mode alternately after outage for the first time.If pump load takes place to change significantly or device when changing on other oil well, when the off-line measurement judgment means is not suitable for star and connects during switching on, with motor windings joint angle type connection, restart operation by the brace in the control device.
Whether some oil well load often changes in the oil field, after operation, transferring ginseng and balancing, all will make operating mode change, can connect and must redeterminate by star, at this moment preferably adopts the mode of dynamic variable star angle.For dynamic variable star angle, record power curve by Control System of Microcomputer, judge that in real time whether motor can connect operation (comprising star switches through apart from whether enough and whether more energy-conservation than corner connection) by star in the energising period, dynamically changes winding connection method by contactor.Under the situation of oil pumper working conditions change, still can excavate maximum energy-saving potential.
No matter be static state or dynamic variable star angle, switch to that star connects or star connects and all will produce bigger electric current and mechanical shock when switching to corner connection in corner connection, this is because the electromotive force on the motor winding requires the size and Orientation of magnetic flux all will change in the handoff procedure, and magnetic flux can not suddenly change, the attenuating dc component that must cause like this superposeing makes that magnetic flux instantaneous value on negative half period is excessive, add saturation, impulse current may reach more than 10 times.
If in the variable star angle process, cut off the power supply a period of time earlier, flux decay in motor is zero or very little remanent magnetism, by the soft input technology of controllable silicon (increasing trigger angle gradually makes magnetic flux rise to rated value gradually) motor is changed to another kind of connection type again, electric current and mechanical shock will reduce significantly, the mode of this outage-switching-energising has again realized the nothing impact switching of variable star angle process, and still can implement the control that corner connection discontinuous power supply or star connect discontinuous power supply according to operating mode after switching.
Seeing also Fig. 2, is the flow process of static variable star angle method.
Step S11 measures by the instrument and meter of measuring power and to judge that motor could connect by star when the heavy duty, and it is that star connects outage operational mode or corner connection outage operational mode that brace and program are set.
Step S12, the conventional corner connection of motor starts.
Step S13 determines de-energized by the power curve that collection calculates.
Step S14, in de-energized constantly, the control main contactor disconnects, and switches to the discontinuous power supply operation, and controllable silicon is stopped paying out pulse, the auxiliary contactor closure.
Step S15 judges that rotating speed is moved by the back energising of the soft input of controllable silicon in the position of suitable energising.And re-execute step S14 constantly in de-energized next time.
Seeing also Fig. 3, is the flow process of dynamic variable star angle method.
Step S21, the conventional corner connection of motor starts.
Step S22 determines de-energized by the power curve that collection calculates.
Step S23 connects still corner connection operation of operation by the power curve of heavy duty energising period and the relatively judgement star of the parameter of electric machine.
Step S24, in de-energized constantly, the control main contactor disconnects, and switches to the discontinuous power supply operation, and controllable silicon is stopped paying out pulse, the auxiliary contactor closure.
Step S25 judges that rotating speed is moved by the back energising of the soft input of controllable silicon in the position of suitable energising.And during switching on, judge and whether need to carry out variable star angle next time.Re-execute step S24 constantly in de-energized next time.
For the ease of to further understanding of the present invention, the present invention is described in detail below in conjunction with instantiation.
See also Fig. 4, data acquisition unit 110 is gathered the of ac of electric current and voltage by voltage transformer 111 summation current transformers 112, through signal conditioner 113 signal is become the signal of 0～5V scope, directly give the CPU with built-in A/D (analog-to-digital conversion) (central processing unit) chip 121 in the microcomputer control unit 120.
Cpu chip 121 calculates power after analog signal conversion is digital quantity, by comparing with definite value parameter K * P0, determines the period (wherein P0 is the no-load loss of motor, and K is for adjusting coefficient) that can cut off the power supply in the power curve; And the power during the heavy duty is compared with definite value parameter Py, and can judgement star connect and whether star connects more energy-conservationly than corner connection, determines operational mode (wherein Py is generally to should the motor star connecing the load factor point of total losses greater than the corner connection total losses).
In this example, what the cpu chip 121 of microcomputer control unit 120 adopted is the 64 pin embedded chips of a built-in FlashRam and A/D.
Cpu chip 121 is by after judging, send and trigger or stop paying out the signal of pulse, isolate output 131 through photoelectricity and enter triggering performance element 130, if accept triggering signal, then gate circuit 132 is opened, the pulse signal of pulse generating circuit 133 just can divide two-way to trigger antiparallel two controllable silicons respectively by after the isolation of pulse transformer 134.Cpu chip 121 can be controlled the interval and the sequential of trigger impulse, and the nothing of realization motor under specific rotation speeds impacted soft input.
, be the main circuit and the secondary circuit figure of static variable star angle please in the lump referring to Fig. 5 and Fig. 6.
Referring to Fig. 7, the flow process of static variable star angle is as follows:
Step S111 makes power curve at other data acquisition instrument of oil pumper usefulness in service, judges that this motor load can connect operation by star.
Step S112 shuts down, and changes the brace LP among Fig. 5 into right side three binding posts and couples together, be i.e. controllable silicon loop wye connection.
Step S113 is during conventional the startup, with the by-pass switch KF1 closure among Fig. 6, so by the main contactor KM1 closure among Fig. 5 the motor corner connection is started.Microcomputer control unit is stopped paying out trigger impulse to controllable silicon.
Step S114 starts the back data acquisition unit and gives microcomputer control unit with voltage and current signal.
Step S115, the cpu chip conversion Calculation of microcomputer control unit obtains real-time performance number, and cpu chip judges that performance number is the outage period in the period less than definite value K*P0.
Step S116 detects whether the operation that manually change over switch KF1 is switched to power save mode is arranged, if do not have then conventional operation, continues to wait for; If have, then enter step S117.
Step S117, KF1 disconnect, and cpu chip is judged performance number between decrement phase during less than definite value K*P0, the normally-closed contact of Fig. 6 repeat circuit KA1 are also disconnected, so main contactor KM1 disconnects.
Step S118, at this moment, the normally-closed contact of KM1 and the normally opened contact of KA1 are all closed, and feasible auxiliary contactor KM2 with the main contactor interlocking could auto-closing after KM1 disconnects.Even the silicon controlled trigger impulse fails to cut off, can not cause short circuit yet.
Step S119, microcomputer control unit measure motor outage rotor speed afterwards by data acquisition unit again.
Step S120 judges that whether rotor speed be from being higher than rotating speed definite value n1 near n1.Judge if not continuing to detect; If then enter step S121.
Step S121 judges earlier in this Machine cycle whether KF1 is had the operation that switches to routine from energy-conservation before energising.If have, execution in step S126 then; If no, then
Step S122, microcomputerized controller provide the sequence triggering signal, make controllable silicon obtain the relative trigger pulse from triggering performance element, and the nothing of realization motor under the n1 rotating speed impacted soft input.
Step S123, after the whole conductings of controllable silicon, motor is gathered the judgement that voltage and current is used for cutting off the power supply next time again at the energising run duration.
Step S124, cpu chip judge performance number whether between decrement phase less than definite value K*P0.If also do not have, continue execution in step S124; If have, then
Step S125, microcomputer control unit stop to send out triggering signal to triggering performance element, and controllable silicon can not get trigger impulse, will automatically shut down when current over-zero.Enter the outage operation once more, re-execute step S119.
Step S126, microcomputer control unit open the normally opened contact of Fig. 6 repeat circuit KA1, and KM2 is disconnected; The normally-closed contact of closed KA1 of while, after KM2 disconnects, the coil of the closed KM1 of the normally-closed contact of KM2, the KM1 closure is conventional corner connection operation.Whenever this interlocking design has guaranteed that KM1 and KM2 can be closed simultaneously, also can not be short-circuited even controllable silicon is once breakdown.
, be the main circuit and the secondary circuit figure of static variable star angle please in the lump referring to Fig. 8 and Fig. 9.
Referring to Figure 10, dynamically the flow process of variable star angle is as follows:
Step S211 is with the by-pass switch KF1 closure among Fig. 9, so by the KM1 closure among Fig. 8 the conventional corner connection of motor is started.
Step S212, microcomputer control unit is stopped paying out trigger impulse to controllable silicon.
Step S213 starts the back data acquisition unit and gives microcomputer control unit with voltage and current signal.
Step S214, the cpu chip conversion Calculation of microcomputer control unit obtains real-time performance number, and cpu chip judges that performance number is the outage period in the period less than definite value K*P0.Power in power curve during the heavy duty is compared with definite value parameter Py, and can judgement star connect and star connects which to be compared with corner connection energy-conservation, thereby determine operational mode.
Step S215 detects whether the operation that manually change over switch KF1 is switched to power save mode is arranged, if do not have then conventional operation, continues to wait for; If have, then
Step S216, because KF1 disconnects, cpu chip is judged performance number between decrement phase during less than definite value K*P0, the normally-closed contact of Fig. 9 repeat circuit KA1 is also disconnected, so main contactor KM1 disconnects.
Step S217 judges that operational mode is that star connects or corner connection.
Step S218, if corner connection, referring to Fig. 9, with the normally-closed contact closure of relay K A2, its normally opened contact disconnects the KM3 coil, KM3 is in off-state, its normally-closed contact closure, so the KM2 coil electricity, corner connection auxiliary contactor KM2 is closed to be the corner connection mode.
Step S219, if star connects, referring to Fig. 9, this moment, the normally opened contact of KA1 was closed, after main contactor KM1 disconnected, its normally-closed contact was closed.The normally-closed contact of relay K A2 is disconnected, and its normally opened contact is closed simultaneously to disconnect the KM2 coil, then KM2 disconnect, its normally-closed contact closure, conducting the coil of KM3, star connects auxiliary contactor KM3 closure and connects mode for star.
Step S220, microcomputer control unit measure motor outage rotor speed afterwards by data acquisition unit again.
Step S221 judges that whether rotor speed be from being higher than rotating speed definite value n1 near n1.If not, continue to detect and judge; If, then
Step S222 judges earlier in this Machine cycle whether KF1 is had the operation that switches to routine from energy-conservation before energising.If have, execution in step S227 then; If no, then
Step S223, microcomputerized controller provide the sequence triggering signal, make controllable silicon obtain the relative trigger pulse from triggering performance element, and the nothing of realization motor under the n1 rotating speed impacted soft input.
Step S224, after the whole conductings of controllable silicon, motor is gathered voltage and current again at the energising run duration, and cpu chip calculates the power during the energising, determines that again operational mode next time is that star connects or corner connection.Realized according to the operating mode function of variable star angle dynamically.
Step S225, cpu chip judge performance number whether between decrement phase less than definite value K*P0.If also do not have, continue execution in step S224; If have, then
Step S226, microcomputer control unit stop to send out triggering signal to triggering performance element, and controllable silicon can not get trigger impulse, will automatically shut down when current over-zero.Enter the outage operation once more, re-execute step S117.
Step S227, microcomputer control unit open the normally opened contact of Fig. 9 repeat circuit KA1, make the KM3 coil losing electricity; The normally-closed contact of KA1 is also closed simultaneously; The normally-closed contact of control KA2 disconnects, and makes the coil losing electricity of KM2.Auxiliary contactor KM2 and KM3 disconnect.
Step S228, after KM3 disconnects, the normally-closed contact closure of KM3, the coil electricity of KM1, main contactor KM1 closure is conventional corner connection operational mode.This interlocking design has guaranteed that contactor KM1, the KM2 of corner connection whenever can be closed simultaneously with the contactor KM3 that star connects, and also can not be short-circuited even controllable silicon is once breakdown.
In sum, compare with the electricity-saving controller of existing pumping motor, power-saving control method provided by the invention and device both can have been realized the control of motor of beam-pumping unit discontinuous power supply, can realize variable star angle according to oil well condition again, further development of latent energy-saving potential.The data that microcomputer control unit is gathered at data acquisition unit, determine energising and power-cut time, judge that star connects or the corner connection operational mode, by triggering performance element and driver element switch element is controlled in real time effectively, made motor run on the discontinuous power supply running status of energy-saving effect the best.
For preventing the shutdown that meets accident in the whole discontinuous power supply process; this control device has designed lost-control protection; in energy-saving control loop, go wrong and shut down or during irregular operating, automatically switch to the conventional operation mode, and be provided with the bypass change over switch that manual switchover is the conventional operation state.
For preventing the short circuit that meets accident in the variable star angle process, star connects the design of having adopted interlocking-type with the contactor of corner connection.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (14)
1. the control method of a discontinuous power supply combined with star angle converting for motor of pumping unit is characterized in that, comprises step:
1) judge that motor could connect by star when heavy duty, it is that star connects or corner connection outage operational mode that the outage operational mode is set;
2) the motor corner connection starts;
3) under the energising operational mode, gather the power of electric motor curve, determine de-energized;
4) in de-energized constantly, connect or corner connection outage operational mode switches to the discontinuous power supply operation with motor according to the star of aforementioned setting;
5) rotating speed of detection motor need to judge whether energising, if not, then continues to detect; If then enter step 6);
6) be converted to the energising operation in the position of suitable energising.
2. the control method of discontinuous power supply combined with star angle converting for motor of pumping unit as claimed in claim 1 is characterized in that, in described step 3) and 4) between also comprise: whether detect has the operation that switches to power save mode, if not, conventional operation then; If then enter step 4); Whether also comprise between described step 5) and step 6): detecting has the operation that switches to conventional state, if then switch to conventional corner connection operation; If not, then enter step 6).
3. the control method of discontinuous power supply combined with star angle converting for motor of pumping unit according to claim 1 is characterized in that, star also comprises the step of contactor interlocking when connecing with the corner connection conversion.
4. according to the control method of each described discontinuous power supply combined with star angle converting for motor of pumping unit of claim 1 to 3, it is characterized in that the mode of adopt outage in the described step 4), switch, switching on again realizes the nothing impact of variable star angle process.
5. according to the control method of each described discontinuous power supply combined with star angle converting for motor of pumping unit of claim 1 to 3, it is characterized in that the switching in the described step 4) specifically comprises: the control main contactor disconnects, and is converted to the discontinuous power supply operation, controllable silicon is stopped paying out pulse, the auxiliary contactor closure; The conversion of described step 6) specifically is by the back energising operation of the soft input of controllable silicon.
6. the control method of a discontinuous power supply combined with star angle converting for motor of pumping unit is characterized in that, comprises step:
21) the conventional corner connection of motor starts;
22) gather the power of electric motor curve, determine de-energized;
23) under the energising operational mode, relatively power curve and the motor parameter of heavy duty energising period determine that the outage operational mode is that star connects operation or corner connection operation;
24) in de-energized constantly, connect or corner connection outage operational mode switches to the discontinuous power supply operation with motor according to aforementioned definite star;
25) rotating speed of detection motor need to judge whether energising, if not, then continues to detect; If then enter step 26);
26) be converted to the energising operation in the position of suitable energising.
7. the control method of discontinuous power supply combined with star angle converting for motor of pumping unit as claimed in claim 6 is characterized in that, in described step 22) and 23) between also comprise: whether detect has the operation that switches to power save mode, if not, conventional operation then; If then enter step 23); In described step 25) and step 26) between also comprise: detect whether the operation that switches to conventional state is arranged, if then switch to conventional corner connection operation; If not, then enter step 6).
8. the control method of discontinuous power supply combined with star angle converting for motor of pumping unit according to claim 6 is characterized in that, star also comprises the step of contactor interlocking when connecing with the corner connection conversion.
9. according to the control method of each described discontinuous power supply combined with star angle converting for motor of pumping unit of claim 6 to 8, it is characterized in that described step 24) the middle nothing impact of adopting the mode of cutting off the power supply, switch, switching on again to realize the variable star angle process.
10. according to the control method of each described discontinuous power supply combined with star angle converting for motor of pumping unit of claim 6 to 8, it is characterized in that, described step 24) switching in specifically comprises: if corner connection outage operational mode, then with the normally-closed contact closure of second relay, its normally opened contact disconnects the coil of the 3rd contactor, and the 3rd contactor is in off-state, its normally-closed contact closure, so the coil electricity of second contactor, the corner connection auxiliary contactor is closed to be the corner connection mode; If star connects the outage operational mode, with the normally-closed contact disconnection of second relay, its normally opened contact is closed simultaneously to disconnect second contactor coil, second contactor disconnects, its normally-closed contact closure, the coil of conducting the 3rd contactor, star connects the auxiliary contactor closure and connects mode for star; Described step 26) conversion specifically is by the back energising operation of the soft input of controllable silicon.
11. the control device of a discontinuous power supply combined with star angle converting for motor of pumping unit is characterized in that, comprising:
Switch element comprises controllable silicon and contactor on the main power source input circuit that is connected motor, is used to control the on/off and the winding connection mode of motor;
Trigger performance element, connect described controllable silicon, carry out the silicon controlled conducting or turn-off control;
Driver element connects described contactor, the break-make of control contactor;
Data acquisition unit is connected with the electric power loop of motor, is used for extracting when powering continuously voltage and current instantaneous value;
Microcomputer control unit, the input signal end connects the signal output part of described data acquisition unit, and output connects triggering performance element and driver element; Be used to obtain the power of electric motor curve, determine the de-energized and the moment, and judge and to connect operation by star; Continue to extract voltage and current instantaneous value in the power up phase of discontinuous power supply, as the calculated value of protection with compare with reference to definite value, can continue judgement simultaneously connect operation by star; In the outage operation phase,, send signal in good time and motor is carried out soft input control for the triggering performance element according to the rotating speed of motor.
12. the control device of discontinuous power supply combined with star angle converting for motor of pumping unit according to claim 11, it is characterized in that: star connects with the contactor of corner connection and driver element secondary circuit thereof and adopts the interlocking-type design, is used for preventing during the variable star angle and the control procedure main circuit is short-circuited.
13. the control device of discontinuous power supply combined with star angle converting for motor of pumping unit according to claim 11 is characterized in that: also comprise the by-pass switch that is used to switch conventional operation and energy-saving run state.
14. according to the control device of the interrupted electricity consumption of each described motor of oil extractor of claim 11 to 13 in conjunction with variable star angle, it is characterized in that: described microcomputer control unit adopts the mode control switch element of outage, switching, energising again to realize the nothing impact of conversion process when variable star angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100679935A CN1314196C (en) | 2005-04-30 | 2005-04-30 | Controlling method and apparatus of discontinuous power supply combined with star angle converting for motor of pumping unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100679935A CN1314196C (en) | 2005-04-30 | 2005-04-30 | Controlling method and apparatus of discontinuous power supply combined with star angle converting for motor of pumping unit |
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| CN1688100A true CN1688100A (en) | 2005-10-26 |
| CN1314196C CN1314196C (en) | 2007-05-02 |
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| CNB2005100679935A Expired - Fee Related CN1314196C (en) | 2005-04-30 | 2005-04-30 | Controlling method and apparatus of discontinuous power supply combined with star angle converting for motor of pumping unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199425A (en) * | 2016-06-29 | 2016-12-07 | 华北电力大学 | A kind of for judging the method whether motor of oil extractor uses discontinuous power supply |
| CN108258974A (en) * | 2018-01-23 | 2018-07-06 | 华中科技大学 | A kind of machine winding triangle star-like connection dynamic configuration circuit and control method |
| CN108336747A (en) * | 2018-04-09 | 2018-07-27 | 西安仪科自动化有限责任公司 | A kind of star-like energy saving in running switch board of beam pumping unit turn |
| CN117082829A (en) * | 2023-08-28 | 2023-11-17 | 东营市沃格艾迪石油技术有限公司 | Automatic star-angle conversion energy-saving control device for oil pumping unit |
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| US4508487A (en) * | 1979-04-06 | 1985-04-02 | Cmd Enterprises, Inc. | Automatic load seeking control for a pumpjack motor |
| US4425539A (en) * | 1980-03-13 | 1984-01-10 | Borg-Warner Corporation | Control system for AC induction motor |
| HU9401800D0 (en) * | 1994-06-17 | 1994-09-28 | Energestor Kereskedelmi Es Szo | Electronic apparatus for decrease of active and reactive energy consumption of ac electric motors with star-delta connection loaded by variable load, improvement of power factor and motor protection |
| US5818195A (en) * | 1997-06-05 | 1998-10-06 | Mcg, Inc. | Dual state controller for brushless electric motors |
| CN2315718Y (en) * | 1997-06-29 | 1999-04-21 | 胜利石油管理局孤岛采油厂 | Star-delta conversion energy saving device for single chip machine controlled oil pumping motor |
| CN2558767Y (en) * | 2001-12-28 | 2003-07-02 | 石油大学(北京) | Pumping and power switching controlling device between pumping units |
| CN2603198Y (en) * | 2002-12-18 | 2004-02-11 | 孙苏虹 | Intelligent oil sucker controller with electricity fraudulent use prevention and energy saving function |
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| CN2785254Y (en) * | 2005-04-30 | 2006-05-31 | 华北电力大学（北京） | Oil extractor motor discontinuous electricity use combination star angle convert controlling equipment |
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| CN106199425A (en) * | 2016-06-29 | 2016-12-07 | 华北电力大学 | A kind of for judging the method whether motor of oil extractor uses discontinuous power supply |
| CN106199425B (en) * | 2016-06-29 | 2019-02-05 | 华北电力大学 | A method of for judging whether motor of oil extractor uses discontinuous power supply |
| CN108258974A (en) * | 2018-01-23 | 2018-07-06 | 华中科技大学 | A kind of machine winding triangle star-like connection dynamic configuration circuit and control method |
| CN108336747A (en) * | 2018-04-09 | 2018-07-27 | 西安仪科自动化有限责任公司 | A kind of star-like energy saving in running switch board of beam pumping unit turn |
| CN108336747B (en) * | 2018-04-09 | 2024-04-26 | 西安仪科自动化有限责任公司 | Star-shaped running energy-saving control cabinet of beam pumping unit |
| CN117082829A (en) * | 2023-08-28 | 2023-11-17 | 东营市沃格艾迪石油技术有限公司 | Automatic star-angle conversion energy-saving control device for oil pumping unit |
| CN117082829B (en) * | 2023-08-28 | 2024-03-01 | 东营市沃格艾迪石油技术有限公司 | Automatic star-angle conversion energy-saving control device for oil pumping unit |
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Application publication date: 20051026 Assignee: Shandong Chenghua Electronic Technology Co., Ltd. Assignor: North China Electric Power University Contract record no.: 2010990000126 Denomination of invention: Controlling method and apparatus of discontinuous power supply combined with star angle converting for motor of pumping unit Granted publication date: 20070502 License type: Exclusive License Record date: 20100317 |
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