CN111884174A - Control method for oil well motor - Google Patents
Control method for oil well motor Download PDFInfo
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- CN111884174A CN111884174A CN202010810575.5A CN202010810575A CN111884174A CN 111884174 A CN111884174 A CN 111884174A CN 202010810575 A CN202010810575 A CN 202010810575A CN 111884174 A CN111884174 A CN 111884174A
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- control module
- oil well
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0854—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load responsive to rate of change of current, couple or speed, e.g. anti-kickback protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/032—Reciprocating, oscillating or vibrating motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The invention discloses a control method for an oil well motor, wherein a driving circuit of the oil well motor comprises a driving power supply module, a driving module and a control module, wherein the driving power supply module is provided with an input end and a first output end, the driving module is connected with the first output end of the driving power supply module, the control module is used for controlling a circuit, and a second output end of the driving module is connected with the oil well motor; the control module controls the drive module to be powered on and run; the method comprises the following steps: the control module collects the voltage and/or current conditions of at least one end of the input end, the first output end and the second output end; when the control module analyzes the acquired information to be abnormal, the control module judges that the circuit has an abnormal fault; and when the circuit has abnormal faults, executing step abnormal fault processing to ensure that the driving module does not drive and output the oil well motor. The invention realizes the protection of the software level by collecting the current and/or the voltage; and the driving module adopts PWM with controllable duty ratio to drive the oil well motor.
Description
Technical Field
The invention relates to the field of oil well motors, in particular to a control method for an oil well motor.
Background
The numerical control reciprocating electric submersible pump is a new generation oil extraction equipment which uses a linear motor as a power driving device and directly drives a tubular oil pump to extract oil. The circuit consists of three parts of a linear motor, a tubular oil well pump and a ground control cabinet. The control cabinet is electrically connected with the linear motor through a three-phase high-voltage cable, and the linear motor is mechanically connected with the oil well pump and submerged into an underground oil layer. The control cabinet drives the linear motor to reciprocate through the high-voltage cable, the direction of the linear motor is consistent with the motion direction of the plunger, the plunger of the oil pump is driven to do periodic reciprocating motion, and oil is lifted to the ground. The existing control cabinet cannot obtain information processing drive such as real phase current, bus current and the like, so that the protection measures of the control cabinet are all dependent on hardware overcurrent protection, double protection cannot be realized, and the control cabinet is easy to damage; meanwhile, the step changing method that the driving module is fully opened by the upper bridge arm or the lower bridge arm is adopted, so that the method cannot adapt to more working conditions.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an oil well motor control method, which realizes the protection of a software layer by collecting current and/or voltage; and the driving module adopts PWM with controllable duty ratio to drive the oil well motor.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
a control method for an oil well motor is characterized in that a driving circuit of the oil well motor comprises a driving power supply module provided with an input end and a first output end, a driving module connected with the first output end of the driving power supply module, and a control module used for circuit control, wherein a second output end of the driving module is connected with the oil well motor; the control module controls the drive module to be powered on and run; the method comprises the following steps:
a, the control module collects the voltage and/or current conditions of at least one end of an input end, a first output end and a second output end;
b, when the control module analyzes that the acquired information is abnormal, the control module judges that the circuit has abnormal faults; when the circuit has abnormal fault, executing step C;
and C, processing abnormal faults, so that the driving module does not drive and output the oil well motor.
Specifically, the input end inputs alternating current, and the first output end outputs direct current, so a rectifying device is arranged between the input end and the first output end; the driving module outputs a driving oil well motor through the reactor; the driving device adopts an IGBT; the oil well motor is an oil well linear motor.
By adopting the method, the control module can judge whether the voltage and/or current signals are abnormal or not in the software level by acquiring and obtaining the voltages and/or currents of the input end, the first output end and the second output end, so that the protection of the software level is realized.
Furthermore, when the circuit is abnormally failed and the step C is executed,
if the driving module is in the power-on state, the control module stops the power-on of the driving module so as to realize that the driving module does not drive and output the oil well motor.
If the driving module is in the running state, the first output end continues to supply power to the driving module, and the second output end of the driving module stops outputting, so that the driving module does not output driving to the oil well motor, namely only the driving enable of the driving module is removed; or the control module controls the driving module to be powered off so as to realize that the driving module does not drive and output the oil well motor.
By adopting the method, the control module controls the driving module to control the oil well motor; when the driving module finishes electrification, the oil well motor can be driven to operate; and when the driving module is powered off, the oil well motor stops running.
After some abnormal faults occur, the abnormal faults can be eliminated temporarily only by closing the drive of the second output end of the drive module, and the output end of the first output end continuously supplies power to the drive module, so that an operator can conveniently check the reason of the abnormal faults, such as the abnormal output current of the second output end; some abnormal faults only close the drive of the second output end of the drive module, and the abnormal faults still cannot be eliminated, so that the circuit is unreliable in operation, and the drive module needs to be powered off, such as the input voltage of the input end is abnormal.
Further, the step a includes: a1, the control module collects the voltage condition of the input end; in the step B, the step of acquiring information abnormality includes the step of analyzing and judging, by the control module, that the voltage at the input terminal has a phase failure, fluctuation instability, and the like according to the voltage condition of the input terminal acquired in the step a 1.
Specifically, in the operation process of the driving module, if the control module analyzes and judges that the data acquired by the input end is abnormal, the control module controls the driving module to power off in the step C.
Further, the output end is provided with a voltage switching module; the voltage switching module comprises a pre-charging resistor and a pre-charging contactor with a contact connected with the pre-charging resistor in parallel; the step A comprises the following steps: a2, the control module collects the voltage condition of the first output end; the power-on process of the driving module comprises the following steps:
when the voltage of the first output end collected in the step a2 reaches the preset voltage of the control module, the control module controls the pre-charging contactor to be closed, and cuts out the output end of the pre-charging resistor to realize that the output voltage of the first output end is gradually increased;
in the step B, the acquired information abnormality includes that the control module analyzes and judges that the voltage of the first output terminal is abnormal according to the voltage condition of the first output terminal acquired in the step a 2.
When the first output end supplies power to the driving module, the pre-charging resistor is switched into the first output end, and at the moment, the first output end outputs a smaller voltage value; when the voltage value acquired by the control module at the first output end reaches the preset value, closing the pre-charging contactor to cut the pre-charging resistor into the first output end, so that the first output end outputs a larger voltage value; by adopting the method, the voltage input into the driving module from the first output end is slowly increased, and the driving module is effectively prevented from being damaged by high voltage impact during starting.
The abnormal output voltage of the first output end comprises that the voltage of the first output end is too high, and when the first output end is not cut out by the pre-charging resistor before the pre-charging contactor is not closed in the power-on process, the voltage output by the first output end cannot reach a preset value for a long time.
During the operation of the driving module, the oil well motor may generate electricity and transmit voltage to the first output end, so that the voltage of the first output end is increased to cause the voltage of the first output end to be overhigh; if the abnormal fault occurs, the first output end continues to supply power to the driving module in the step C, and the second output end of the driving module stops outputting.
Further, the step a includes: a3, the control module collects the current condition of the first output end; in the step B, the step of acquiring information abnormality includes the control module determining that the current of the first output terminal acquired in the step a3 exceeds a corresponding preset limit value.
Specifically, in the operation process of the driving module, if the control module analyzes and judges that the data acquired by the first end is abnormal, the first output end continues to supply power to the driving module in the step C, and the second output end of the driving module stops outputting.
By adopting the method, the overcurrent protection can be realized on the software level, the double protection can be formed with the overcurrent protection of hardware, and the safety and the reliability of the circuit are enhanced.
Further, the step a includes: a4, the control module collects the current condition of the second output end; in the step B, the step of acquiring information abnormality includes the control module determining that the current of the second output terminal acquired in the step a3 exceeds a corresponding preset limit value.
Specifically, in the operation process of the driving module, if the control module analyzes and judges that the data acquired by the second end is abnormal, the first output end continues to supply power to the driving module in the step C, and the second output end of the driving module stops outputting.
By adopting the method, the overcurrent protection can be realized on the software level, the double protection can be formed with the overcurrent protection of hardware, and the safety and the reliability of the circuit are enhanced.
More specifically, the second output end is U, V, W three-phase output, and the control module performs acquisition analysis on the phase current of each of the three phases.
Further, the control module collects current conditions through a current sensor; the control module detects whether the current sensor is abnormal; and if the current sensor is abnormal, the control module analyzes and judges that the circuit has an abnormal fault.
Specifically, in the operation process of the driving module, if the control module analyzes and judges that the current sensor is abnormal, the first output end continues to supply power to the driving module in the step C, and the second output end of the driving module stops outputting.
By adopting the method, the inaccuracy of the collected data caused by the damage of the collecting element, namely the current sensor is avoided; further ensuring the safety and reliability of the circuit.
Further, the output end is provided with a voltage switching module; the voltage switching module comprises a pre-charging resistor and a pre-charging contactor with a contact connected with the pre-charging resistor in parallel; the control module also controls the drive module to be powered off; the drive module power-on process comprises the following steps:
s11, the control module connects the input end with the first output end;
s12, the control module controls the closing of the pre-charging contactor, and cuts out the output end of the pre-charging resistor to increase the output voltage of the first output end;
s13, the control module controls the drive module to close the electric relay;
s14, the control module sends clear fault enable to the drive module;
s15, the control module sends drive enable to the drive module;
the driving module is powered down and comprises;
s21, the control module clears the drive enable;
s22, the control module controls the drive module to be powered on and off by the power relay;
s23, the control module controls the pre-charging contactor to be disconnected;
and S24, disconnecting the input end from the first output end by the control module.
Specifically, a vacuum contactor is arranged between the input end and the first output end to realize on-off between the input end and the first output end, and a certain delay is arranged between each step of the power-on process and the power-off process.
When the circuit has an abnormal fault in the power-on process of the driving module, stopping the power-on of the driving module can be understood as follows:
if the input end and the first output end are not connected and the acquired information at the input end is abnormal, the control module does not connect the input end and the first output end;
if the input end and the first output end are connected and the pre-charging contactor is not connected, and the acquired information at the input end or the first output end is abnormal, the control module disconnects the input end and the first output end;
if the input end and the first output end are connected and the pre-charging contactor is connected, and the acquisition information of the input end or the first output end is abnormal, the control module firstly disconnects the pre-charging contactor and then disconnects the input end and the first output end;
if the input end and the first output end are connected and the pre-charging contactor is not connected yet, and the voltage of the first output end does not reach the preset value for a long time, the power-on is interrupted, and the next power-on operation is not executed.
Further, the step C further includes: judging the type of the abnormal fault before processing the abnormal fault; if the type of the high-risk abnormal fault is determined, executing step C1; if the type of the low-risk abnormal fault is determined, executing step C2;
c1, executing abnormal fault processing; manually operating the circuit to electrify the driving module again;
c2, executing abnormal fault processing; judging whether the current abnormal fault exists or not; and if the abnormal fault is eliminated, the control module controls the driving module to be electrified again.
By adopting the method, the abnormal faults are classified, the low-risk abnormal fault type has small influence on the circuit and can be automatically recovered, such as the input voltage of the input end is abnormal; the high-risk abnormal fault type has a large influence on the circuit or the circuit hardware is damaged and cannot be recovered by self, and an operator is required to check the high-risk abnormal fault type, if the voltage current of the first output end is abnormal and the current of the second output end is abnormal, the high-risk abnormal fault type needs to be manually electrified again, otherwise, the abnormal fault state cannot be quitted.
Further, a second output end of the driving module outputs PWM to drive the oil well motor; and the control module controls and regulates the duty ratio of the PWM output by the second output end of the driving module.
By adopting the method, the second output end is adopted to output the PWM with the controllable duty ratio to drive the oil well motor, so that the output torque of the oil well motor can be controlled to adapt to more working conditions.
Specifically, the second output end is U, V, W three-phase output, when the upper and lower bridge arms in one phase adopt controllable duty ratios, dead time needs to be added to ensure that the upper and lower bridge arms cannot be simultaneously opened, and the upper and lower bridge arms are complementarily opened and closed with the duty ratios, and if the upper bridge arm is opened by 40%, the lower bridge arm is opened by 60%.
The control module comprises a main control unit for logic processing and a man-machine interaction unit which is connected with the main control unit and is used for man-machine interaction.
The driving circuit of the oil well motor comprises a transformer, wherein the input side of the transformer is connected with the input end and converts the voltage of the input end into 220V alternating current, and the output side of the transformer is used for supplying power to components in the driving circuit of the oil well motor, such as a vacuum contactor for switching on and off the input end and the first output end and a pre-charging contactor for switching in or out a pre-charging resistor at the first output end;
the output side of the transformer is connected with a switching power supply for supplying power to the control module, and the switching power supply converts the voltage at the output side of the transformer into 15V direct-current working voltage of the control module;
a circuit breaker is arranged between the switching power supply and the output side of the transformer and used for controlling the power-on and power-off of the control module; when the circuit breaker is started, the control module is powered on, and the driving module is controlled to start to be powered on; when the circuit breaker is disconnected, the control module controls the driving module to be powered off.
Compared with the prior art, the invention has the following beneficial effects:
(1) the control method for the oil well motor realizes the protection of a software layer by collecting current and/or voltage;
(2) the control method for the oil well motor collects the voltage of the second output end, can realize the slow rise of the voltage of the second output end during starting, and avoids the damage of high-voltage impact on the driving module; and the situation that the oil well motor is in the power generation condition during operation can be realized, so that the voltage of the second input end is overhigh.
(3) The control method for the oil well motor adopts the PWM with the controllable duty ratio to drive the oil well motor by the driving module, and can adapt to more working conditions.
Drawings
FIG. 1 is a schematic diagram of a drive circuit of a well motor in the control method for the well motor according to the present invention;
FIG. 2 is a schematic diagram of the power-on process of the driving module in the control method for the oil well motor of the present invention;
FIG. 3 is a schematic diagram of the lower current path of the drive module in the control method for the well motor of the present invention;
FIG. 4 is a schematic diagram of the voltage determination (taking the voltage at the input end as an example) in the control method for the oil well motor of the present invention;
FIG. 5 is a schematic flow chart of current determination (taking the U-phase voltage at the second input terminal as an example) in the control method for the oil well motor according to the present invention;
FIG. 6 is a schematic view of the processing flow of abnormal faults in the control method for the well motor of the present invention;
reference numerals: 1 an input end; 2 a first output terminal; 3 a second output terminal; 4, a control module; 401 a main control unit; 402 a human-computer interaction unit; 5, a driving module; 6 pre-charging a resistor; 7 pre-charging the contactor; 8, a rectifying device; 9 a vacuum contactor; 10, a transformer; 11 a switching power supply; 12 circuit breaker.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1-6, a control method for an oil well motor, a driving circuit of the oil well motor comprises a driving power supply module provided with an input end 1 and a first output end 2, a driving module 5 connected with the first output end 2 of the driving power supply module, and a control module 4 for circuit control, wherein a second output end 3 of the driving module 5 is connected with the oil well motor; the control module 4 controls the driving module 5 to be powered on and run; the method comprises the following steps:
a, the control module 4 collects the voltage and/or current conditions of at least one end of an input end 1, a first output end 2 and a second output end 3;
b, when the control module 4 analyzes that the acquired information is abnormal, the control module 4 judges that the circuit has an abnormal fault; when the circuit has abnormal fault, executing step C;
and C, processing abnormal faults, so that the driving module 5 does not drive and output the oil well motor.
Specifically, the input end 1 inputs alternating current, and the first output end 2 outputs direct current, so a rectifying device 8 is arranged between the input end 1 and the first output end 2; the driving module 5 outputs a driving oil well motor through a reactor; the driving device adopts an IGBT; the oil well motor is an oil well linear motor.
By adopting the method, the control module 4 can judge whether the voltage and/or current signals are abnormal or not in the software level by acquiring and obtaining the voltages and/or currents of the input end 1, the first output end 2 and the second output end 3, so that the protection of the software level is realized.
Preferably, when the step C is executed in case of an abnormal failure of the circuit,
if the driving module 5 is in the power-on state, the control module 4 stops the power-on of the driving module 5, so that the driving module 5 does not drive and output the oil well motor.
If the driving module 5 is in the running state, the first output end 2 continues to supply power to the driving module 5, and the second output end 3 of the driving module 5 stops outputting, so that the driving module 5 does not drive and output the oil well motor, namely only the driving enable of the driving module 5 is cleared; or the control module 4 controls the driving module 5 to power off, so that the driving module 5 does not drive and output the oil well motor.
By adopting the method, the control module 4 controls the driving module 5 to control the oil well motor; when the driving module 5 is powered on, the oil well motor can be driven to operate; when the driving module 5 is powered off, the oil well motor stops running.
After some abnormal faults occur, the abnormal faults can be eliminated temporarily only by closing the drive of the second output end 3 of the driving module 5, and the output end of the first output end 2 continues to supply power to the driving module 5, so that an operator can conveniently check the reason of the abnormal faults, such as abnormal output current of the second output end 3; some abnormal faults only turn off the drive of the second output end 3 of the driving module 5, and the abnormal faults still cannot be eliminated, so that the circuit operation is unreliable, and therefore the driving module 5 needs to be powered off, for example, the input voltage of the input end 1 is abnormal.
Preferably, the step a includes: a1, the control module 4 collects the voltage condition of the input end 1; in the step B, the abnormal information acquisition includes that the control module 4 analyzes and judges that the voltage at the input end 1 has a phase failure, unstable fluctuation, and the like according to the voltage condition of the input end 1 acquired in the step a 1.
Specifically, in the operation process of the driving module 5, if the control module 4 analyzes and judges that the data acquired by the input end 1 is abnormal, the control module 4 controls the driving module 5 to power off in the step C.
Preferably, the output end is provided with a voltage switching module; the voltage switching module comprises a pre-charging resistor 6 and a pre-charging contactor 7, wherein a contact is connected with the pre-charging resistor 6 in parallel; the step A comprises the following steps: a2, the control module 4 collects the voltage condition of the first output end 2; the power-on process of the driving module 5 comprises the following steps:
when the voltage of the first output end 2 collected in the step a2 reaches the preset voltage of the control module 4, the control module 4 controls the pre-charging contactor 7 to be closed, and cuts out the output end of the pre-charging resistor 6 to gradually increase the output voltage of the first output end 2;
in the step B, the acquired information abnormality includes that the control module 4 analyzes and judges that the voltage of the first output terminal 2 is abnormal according to the voltage condition of the first output terminal 2 acquired in the step a 2.
When the first output end 2 supplies power to the driving module 5, the pre-charging resistor 6 is switched into the first output end 2, and at the moment, the first output end 2 outputs a smaller voltage value; when the voltage value acquired by the control module 4 at the first output end 2 reaches a preset value, closing the pre-charging contactor 7 to switch the pre-charging resistor 6 out of the first output end 2, so that the first output end 2 outputs a larger voltage value; by adopting the method, the voltage input into the driving module 5 by the first output end 2 is slowly increased, and the damage of high voltage impact on the driving module 5 during starting is effectively prevented.
The abnormal output voltage of the first output end 2 includes that the voltage of the first output end 2 is too high, and when the pre-charging contactor 7 is not closed in the charging process, namely the pre-charging resistor 6 is not cut out of the first output end 2, the voltage output by the first output end 2 cannot reach the preset value for a long time.
During the operation of the driving module 5, the oil well motor may generate electricity and transmit voltage to the first output end 2, so that the voltage of the first output end 2 is increased to cause the voltage of the first output end 2 to be overhigh; if the abnormal fault occurs, the first output end 2 continues to supply power to the driving module 5 in the step C, and the second output end 3 of the driving module 5 stops outputting.
Preferably, the step a includes: a3, the control module 4 collects the current condition of the first output end 2; in the step B, the abnormal information acquisition includes the control module 4 determining that the current of the first output end 2 acquired in the step a3 exceeds a corresponding preset limit value.
Specifically, in the operation process of the driving module 5, if the control module 4 analyzes and judges that the data acquired by the first end is abnormal, the first output end 2 continues to supply power to the driving module 5 in the step C, and the second output end 3 of the driving module 5 stops outputting.
By adopting the method, the overcurrent protection can be realized on the software level, the double protection can be formed with the overcurrent protection of hardware, and the safety and the reliability of the circuit are enhanced.
Preferably, the step a includes: a4, the control module 4 collects the current condition of the second output end 3; in the step B, the abnormal information acquisition includes the control module 4 determining that the current of the second output terminal 3 acquired in the step a3 exceeds a corresponding preset limit value.
Specifically, in the operation process of the driving module 5, if the control module 4 analyzes and judges that the data acquired by the second end is abnormal, the first output end 2 continues to supply power to the driving module 5 in the step C, and the second output end 3 of the driving module 5 stops outputting.
By adopting the method, the overcurrent protection can be realized on the software level, the double protection can be formed with the overcurrent protection of hardware, and the safety and the reliability of the circuit are enhanced.
More specifically, the second output terminal 3 is an U, V, W three-phase output, and the control module 4 performs acquisition analysis on the phase current of each of the three phases.
Preferably, the control module 4 collects current conditions through a current sensor; the control module 4 detects whether the current sensor is abnormal; if the current sensor is abnormal, the control module 4 analyzes and judges that the circuit has an abnormal fault.
Specifically, in the operation process of the driving module 5, if the control module 4 analyzes and judges that the current sensor is abnormal, the first output end 2 continues to supply power to the driving module 5 in the step C, and the second output end 3 of the driving module 5 stops outputting.
By adopting the method, the inaccuracy of the collected data caused by the damage of the collecting element, namely the current sensor is avoided; further ensuring the safety and reliability of the circuit.
Preferably, the output end is provided with a voltage switching module; the voltage switching module comprises a pre-charging resistor 6 and a pre-charging contactor 7, wherein a contact is connected with the pre-charging resistor 6 in parallel; the control module 4 also controls the driving module 5 to power off; the power-on process of the driving module 5 comprises the following steps:
s11, the control module 4 connects the input end 1 with the first output end 2;
s12, the control module 4 controls the precharge contactor 7 to close, and switches the precharge resistor 6 out of the output terminal to increase the output voltage of the first output terminal 2;
s13, the control module 4 controls the power-on relay of the driving module 5 to close;
s14, the control module 4 sends clear fault enable to the driving module 5;
s15, the control module 4 sends a drive enable to the drive module 5;
the driving module 5 is powered down and comprises;
s21, the control module 4 clears the drive enable;
s22, the control module 4 controls the drive module 5 to turn off the power relay;
s23, the control module 4 controls the pre-charging contactor 7 to open;
s24, the control module 4 disconnects the input terminal 1 from the first output terminal 2.
Specifically, a vacuum contactor 9 is arranged between the input end 1 and the first output end 2 to realize on-off between the input end 1 and the first output end, and a certain delay is arranged between each step of the power-on process and the power-off process.
When the circuit has an abnormal fault in the power-on process of the driving module 5, stopping the power-on of the driving module 5 can be understood as follows:
if the input end 1 and the first output end 2 are not connected and the collected information at the input end 1 is abnormal, the control module 4 does not connect the input end 1 and the first output end 2;
if the input end 1 and the first output end 2 are connected and the pre-charging contactor 7 is not connected, and the acquired information at the input end 1 or the first output end 2 is abnormal, the control module 4 disconnects the input end 1 and the first output end 2;
if the input end 1 and the first output end 2 are connected and the pre-charging contactor 7 is connected, and the acquisition information of the input end 1 or the first output end 2 is abnormal, the control module 4 firstly disconnects the pre-charging contactor 7 and then disconnects the input end 1 and the first output end 2;
if the input end 1 and the first output end 2 are connected and the pre-charging contactor 7 is not connected yet, and the voltage of the first output end 2 does not reach the preset value for a long time, the power-on is interrupted, and the next power-on operation is not executed.
Preferably, the step C further includes: judging the type of the abnormal fault before processing the abnormal fault; if the type of the high-risk abnormal fault is determined, executing step C1; if the type of the low-risk abnormal fault is determined, executing step C2;
c1, executing abnormal fault processing; manually operating the circuit to electrify the driving module 5 again;
c2, executing abnormal fault processing; judging whether the current abnormal fault exists or not; if the abnormal fault is eliminated, the control module 4 controls the driving module 5 to be powered on again.
By adopting the method, the abnormal faults are classified, the low-risk abnormal fault type has small influence on the circuit and can be recovered automatically, for example, the input voltage of the input end 1 is abnormal; the high-risk abnormal fault type has a large influence on the circuit or the circuit hardware is damaged and cannot be recovered by self, and an operator is required to check the high-risk abnormal fault type, if the voltage and the current of the first output end 2 are abnormal and the current of the second output end 3 is abnormal, the high-risk abnormal fault type needs to be manually electrified again, otherwise, the abnormal fault state cannot be quitted.
Preferably, the second output 3 of the driving module 5 outputs PWM to drive the oil well motor; the control module 4 controls and adjusts the duty ratio of the PWM output by the second output terminal 3 of the driving module 5.
By adopting the method, the second output end 3 is adopted to output the PWM with the controllable duty ratio to drive the oil well motor, so that the output torque of the oil well motor can be controlled to adapt to more working conditions.
Specifically, the second output terminal 3 is U, V, W three-phase output, when the upper and lower bridge arms in one phase adopt controllable duty ratios, dead time needs to be added to ensure that the upper and lower bridge arms cannot be simultaneously turned on, and the upper and lower bridge arms are complementarily turned on and off with the duty ratios, and if the upper bridge arm is turned on by 40%, the lower bridge arm is turned on by 60%.
The control module 4 includes a main control unit 401 for logic processing, and a human-computer interaction unit 402 connected to the main control unit 401 and used for human-computer interaction.
The driving circuit of the oil well motor comprises a transformer 10, wherein the input side of the transformer 10 is connected with the input end 1 and converts the voltage of the input end 1 into 220V alternating current, and the output side of the transformer 10 is used for supplying power to components in the driving circuit of the oil well motor, such as a vacuum contactor 9 for switching on and off the input end 1 and the first output end 2 and a pre-charging contactor 7 for switching on or off the pre-charging resistor 6 to the first output end 2;
the output side of the transformer 10 is connected with a switching power supply 11 for supplying power to the control module 4, and the switching power supply 11 converts the voltage at the output side of the transformer 10 into 15V direct-current working voltage of the control module 4;
a circuit breaker 12 is arranged between the switching power supply 11 and the output side of the transformer 10 and is used for controlling the power-on and power-off of the control module 4; when the circuit breaker 12 is started, the control module 4 is powered on, and the driving module 5 is controlled to start to be powered on; when the circuit breaker 12 is opened, the control module 4 controls the drive module 5 to be powered down.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A control method for an oil well motor is characterized in that a driving circuit of the oil well motor comprises a driving power supply module provided with an input end (1) and a first output end (2), a driving module (5) connected with the first output end (2) of the driving power supply module, and a control module (4) used for controlling, wherein a second output end (3) of the driving module (5) is connected with the oil well motor; the method is characterized in that: the control module (4) controls the drive module (5) to be powered on and run; the method comprises the following steps:
a, the control module (4) collects the voltage and/or current conditions of at least one end of an input end (1), a first output end (2) and a second output end (3);
b, when the control module (4) analyzes and obtains the abnormal collected information, the control module (4) judges that the circuit has an abnormal fault; when the circuit has abnormal fault, executing step C;
and C, processing abnormal faults to ensure that the driving module (5) does not drive and output the oil well motor.
2. A control method for an oil well motor according to claim 1, characterized in that: when the step C is executed in case of an abnormal failure of the circuit,
if the driving module (5) is in the power-on state, the control module (4) stops the power-on of the driving module (5) so as to realize that the driving module (5) does not drive and output the oil well motor.
If the driving module (5) is in an operating state, the first output end (2) continues to supply power to the driving module (5), and the second output end (3) of the driving module (5) stops outputting, so that the driving module (5) does not drive and output the oil well motor; or the control module (4) controls the driving module (5) to be powered off so as to realize that the driving module (5) does not drive and output the oil well motor.
3. A control method for an oil well motor according to claim 1, characterized in that: the step A comprises the following steps: a1, the control module (4) collects the voltage condition of the input end (1); in the step B, the step of acquiring information abnormality includes that the control module (4) analyzes and judges that the voltage of the input terminal (1) has a phase failure according to the voltage condition of the input terminal (1) acquired in the step a 1.
4. A control method for an oil well motor according to claim 1, characterized in that: the output end is provided with a voltage switching module; the voltage switching module comprises a pre-charging resistor (6) and a pre-charging contactor (7) with a contact point connected with the pre-charging resistor (6) in parallel; the step A comprises the following steps: a2, the control module (4) collects the voltage condition of the first output end (2); the power-on process of the driving module (5) comprises the following steps:
when the voltage of the first output end (2) collected in the step a2 reaches the preset voltage of the control module (4), the control module (4) controls the pre-charging contactor (7) to be closed, and the pre-charging resistor (6) is switched out of the output end to gradually increase the output voltage of the first output end (2);
in the step B, the acquired information abnormality includes that the control module (4) analyzes and judges that the voltage of the first output end (2) is abnormal according to the voltage condition of the first output end (2) acquired in the step a 2.
5. A control method for an oil well motor according to claim 1, characterized in that: the step A comprises the following steps: a3, the control module (4) collects the current condition of the first output end (2); in the step B, the abnormal information acquisition includes that the control module (4) determines that the current of the first output end (2) acquired in the step a3 exceeds a corresponding preset limit value.
6. A control method for an oil well motor according to claim 1, characterized in that: the step A comprises the following steps: a4, the control module (4) collects the current condition of the second output end (3); in the step B, the abnormal information acquisition includes that the control module (4) determines that the current of the second output end (3) acquired in the step a3 exceeds a corresponding preset limit value.
7. A control method for an oil well motor according to claim 1, characterized in that: the control module (4) collects the current condition through a current sensor; the control module (4) detects whether the current sensor is abnormal; if the current sensor is abnormal, the control module (4) analyzes and judges that the circuit has abnormal faults.
8. A control method for an oil well motor according to claim 1, characterized in that: the output end is provided with a voltage switching module; the voltage switching module comprises a pre-charging resistor (6) and a pre-charging contactor (7) with a contact point connected with the pre-charging resistor (6) in parallel; the control module (4) also controls the drive module (5) to be powered off; the power-on process of the driving module (5) comprises the following steps:
s11, the control module (4) connects the input end (1) and the first output end (2);
s12, the control module (4) controls the pre-charging contactor (7) to be closed, and switches the pre-charging resistor (6) out of an output end to increase the output voltage of the first output end (2);
s13, the control module (4) controls the closing of an electric relay on the driving module (5);
s14, the control module (4) sends clear fault enable to the drive module (5);
s15, the control module (4) sends drive enabling to the drive module (5);
the driving module (5) is powered down and comprises;
s21, the control module (4) clears the drive enable;
s22, the control module (4) controls the drive module (5) to switch off the electric relay;
s23, the control module (4) controls the pre-charging contactor (7) to be disconnected;
and S24, disconnecting the input end (1) and the first output end (2) by the control module (4).
9. A control method for an oil well motor according to claim 1, characterized in that: the step C further comprises the following steps: judging the type of the abnormal fault before processing the abnormal fault; if the type of the high-risk abnormal fault is determined, executing step C1; if the type of the low-risk abnormal fault is determined, executing step C2;
c1, executing abnormal fault processing; manually operating the circuit to electrify the driving module (5) again;
c2, executing abnormal fault processing; judging whether the current abnormal fault exists or not; if the abnormal fault is eliminated, the control module (4) controls the driving module (5) to be electrified again.
10. A control method for an oil well motor according to claim 1, characterized in that: a second output end (3) of the driving module (5) outputs PWM to drive an oil well motor; and the control module (4) controls and regulates the duty ratio of PWM output by the second output end (3) of the driving module (5).
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