CN110932603A - Control method and control device for anti-interference restarting of motor - Google Patents
Control method and control device for anti-interference restarting of motor Download PDFInfo
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- CN110932603A CN110932603A CN201911152373.XA CN201911152373A CN110932603A CN 110932603 A CN110932603 A CN 110932603A CN 201911152373 A CN201911152373 A CN 201911152373A CN 110932603 A CN110932603 A CN 110932603A
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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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details of starting control
- H02P1/029—Restarting, e.g. after power failure
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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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
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- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention provides a control method for anti-interference restarting of a motor, which comprises the following steps: when the motor is in an initial state of restarting, judging whether the motor is in a normal running state or not according to the current variation trend of the motor; when the motor is in a normal running state, controlling the motor to enter a restarting ready state; when any one phase voltage of the three-phase voltages of the bus falls and the duration t is upPersistenceExceeds the preset time t1Then, the motor is controlled to enter a restart state and simultaneously the voltage collapse time t is startedVoltage collapseTiming; when voltage collapse time tVoltage collapseDoes not exceed the preset time t2The three-phase voltages are restored simultaneously, and the restoration time tRecoveryLasting for more than a preset time t3When the motor is restarted, the contactor is controlled to be switched on, the motor is controlled to enter the restarting action state, and the action state time t is startedMovement ofTiming; when the action state is time tMovement ofReaches the preset time t4And then controlling the motor to enter an initial state.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a control method and a control device for anti-interference restarting of a motor.
Background
When the power distribution system has system power interference, the low-voltage motor is stopped and cannot automatically recover to operate. Industrial enterprises have extremely high requirements on production continuity, and the low-voltage motor is used as important power equipment in a production link, so that once abnormal shutdown occurs, a continuous production process is interrupted, and huge economic loss is generated for the enterprises.
Disclosure of Invention
In order to solve at least one of the above problems, the present invention provides a method for controlling an anti-interference restart of a motor, the method comprising the steps of:
when the motor is in an initial state of restarting, judging whether the motor is in a normal running state or not according to the current variation trend of the motor; when the motor is in a normal running state, controlling the motor to enter a restarting ready state;
when any one phase voltage of the three-phase voltages of the bus falls and the duration t is upPersistenceExceeds the preset time t1Then, the motor is controlled to enter a restart starting state, and simultaneously voltage collapse time t is startedVoltage collapseTiming;
when the voltage collapse time tVoltage collapseDoes not exceed the preset time t2The three-phase voltages are recovered simultaneously, and the recovery time t isRecoveryLasting for more than a preset time t3When the motor is restarted, the contactor is controlled to be switched on, the motor is controlled to enter the restarting action state, and the action state time t is startedMovement ofTiming;
when the action state time tMovement ofReaches the preset time t4And controlling the motor to enter the initial state.
By adopting the technical scheme, through comprehensive judgment of current, voltage and contactor positions, the state moment of the bus voltage which is trapped and recovered can be correctly identified, namely the initial and ending processes of the voltage trapping can be identified, so that the motor can be correctly restarted and controlled.
Optionally, when the motor is in the ready state, the three-phase currents of the motor have no current, and the motor is controlled to enter the initial state. In this way, when the motor is in the ready state, the three-phase currents of the motor are all currentless, i.e. the motor is controlled to enter the initial state, rather than continuing subsequent determination of the voltage and the position of the contactor. According to the mode, the current and the voltage are judged, the closing and opening states of the contactor are also judged in an auxiliary mode, namely, the auxiliary monitoring of the state of the contactor is added, and under the condition that the motor is not restarted successfully, problems can be conveniently checked and events can be conveniently traced.
Optionally, when the motor is in the starting state, the motor is controlled to enter the initial state when any one of the following conditions occurs:
the voltage collapse time tVoltage collapseExceeds the preset time t2；
Or the three-phase voltage exceeds the preset time t2Not recovered;
or the contactor is in a closing state; the initial state is returned.
In this way, when the motor is in a starting state, a voltage collapse time t occursVoltage collapseExceeds the preset time t2(ii) a Or the three-phase voltage exceeds the preset time t2Not recovered; or when the contactor is in any one of the closing states, the motor is controlled to enter the initial state instead of the subsequent action state, and the safety of restarting can be effectively improved.
Optionally, the preset time t1The value range of (A) is 10ms-20 ms. In this way, by presetting the time t1The value range of the voltage can be set to be 10ms-20ms, and the voltage collapse state which causes the return of the contactor can be reliably captured.
Optionally, the preset time t2The value range of (a) is 100ms-500 ms. In this way, by presetting the time t2The value range of the voltage can be set to be 100ms-500ms, and the voltage collapse state which causes the return of the contactor can be reliably captured.
Optionally, the preset time t3The value range of (1) is two power frequency periods. In this way, by presetting the time t3The value range is set to be two power frequency periods, and the recovery time t after the three-phase voltage is recovered can be effectively ensuredRecovery。
Optionally, the preset time t4Is in the range of 500 ms. In this way, by presetting the time t4The value range of (1) is set to be 500ms, so that the duration time of the action state can be effectively ensured.
The invention also provides a control device for the anti-interference restarting of the motor, which executes any one of the control methods; the control device includes:
the three-phase current split-phase acquisition unit, the three-phase voltage split-phase acquisition unit, the contactor position switching value acquisition unit, the timing unit and the relay outlet module are arranged in parallel and connected with the controller;
the three-phase current split-phase acquisition unit is used for split-phase acquisition of the three-phase current;
the three-phase voltage split-phase acquisition unit is used for split-phase acquisition of the three-phase voltage;
the contactor position switching value acquisition unit is used for acquiring the state of a normally open contact of the contactor;
the timing unit is used for respectively recording the duration time tPersistenceVoltage collapse time tVoltage collapseRecovery time tRecoveryAnd time t of action stateMovement of；
The relay outlet module is used for controlling the relay module for closing the contactor.
The control device can comprehensively judge the current, the voltage and the position of the contactor by matching with the control method, and correctly identify the state moment of the bus voltage collapse and recovery, namely the initial and end processes of the voltage collapse, so as to correctly implement the restarting control on the motor.
Drawings
Fig. 1 is a first flowchart of a control method for anti-interference restart of a motor in embodiment 1 of the present invention;
fig. 2 is a second flowchart of a control method for restarting the motor in an anti-interference manner in embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a control device for anti-interference restart of a motor in embodiment 2 of the present invention.
Description of reference numerals:
10-a controller; 20-a three-phase current split-phase acquisition unit; 30-a three-phase voltage split-phase acquisition unit; 40-a contactor position switching value acquisition unit; 50-a timing unit; 60-relay outlet module.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Example 1
The present invention provides an embodiment of a method for controlling an anti-sloshing restart of a motor, it should be noted that the steps illustrated in the flowchart of the accompanying drawings may be executed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be executed in an order different than that illustrated herein.
As shown in one of fig. 1-2, the control method includes the steps of:
s1, when the motor is in the initial state of restarting, judging whether the motor is in the normal operation state or not according to the current variation trend of the motor; when the motor is in a normal running state, controlling the motor to enter a restarting ready state;
s1 specifically includes:
s11, when the motor is in the initial state of restarting, judging whether the motor is in the normal operation state or not according to the current variation trend of the motor;
s12, when the motor is in the normal operation state, controlling the motor to enter the restarting ready state;
s2, when any one phase voltage of the three-phase voltages of the bus falls and the duration t is longPersistenceExceeds the preset time t1Then, the motor is controlled to enter a restarting state and a voltage collapse time t is startedVoltage collapseTiming;
s2 specifically includes:
s21, judging whether any phase voltage in the three-phase voltage of the bus falls;
s22, judging the duration tPersistenceWhether the preset time t is exceeded1；
S23, when any one phase voltage of the three-phase voltages of the bus falls and the duration t is longPersistenceExceeds the preset time t1Then, the motor is controlled to enter a restarting state and a voltage collapse time t is startedVoltage collapseTiming;
s3, when the voltage is trapped for a time tVoltage collapseDoes not exceed the preset time t2The three-phase voltage is recovered, and the recovery time tRecoveryLasting for more than a preset time t3When the starting is started, the contactor is controlled to be switched on, the motor is controlled to enter a restarting action state, and meanwhile, the starting is stoppedTime t for starting action stateMovement ofTiming;
s3 specifically includes:
s31, judging the voltage collapse time tVoltage collapseWhether the preset time t is exceeded2；
S32, judging whether the three-phase voltage is recovered;
s33, judging the recovery time tRecoveryWhether the duration exceeds the preset time t3；
S34, when the voltage is trapped for a time tVoltage collapseDoes not exceed the preset time t2The three-phase voltage is recovered, and the recovery time tRecoveryLasting for more than a preset time t3When the motor is restarted, the contactor is controlled to be switched on, the motor is controlled to enter the restarting action state, and the action state time t is startedMovement ofTiming;
s4, when the time t is in the operating stateMovement ofReaches the preset time t4When the motor is in the initial state, the motor is controlled to enter the initial state;
s4 specifically includes:
s41, judging the action state time tMovement ofWhether the preset time t is reached4；
S42, when the time t is in the operating stateMovement ofReaches the preset time t4And then controlling the motor to enter an initial state.
The invention provides a control method for anti-interference restarting of a motor, which can correctly identify the state moment of the bus voltage collapse and recovery through the comprehensive judgment of current, voltage and contactor position, namely can correctly identify the initial and ending processes of the voltage collapse so as to correctly implement restarting control on the motor.
Specifically, the running state of motor is judged through the current variation trend of motor, compares and judges through the mode of switching value, and is more reliable, and can avoid when the installation is reformed transform contactor node not enough, or the restriction of the lower realistic condition such as auxiliary contact reliability. The running state of the motor can be judged by a current time window method, namely, the smoothness of the motor current is identified by judging the trend of the current change, and the running state of the motor is further identified.
When the bus is started, the condition that any one phase voltage of the three-phase voltages of the bus falls is taken as a judgment basis, the criterion is more complete, and the voltage of a healthy phase is prevented from falling due to the fact that the voltage of the healthy phase falls caused by the fact that the voltage of the three-phase voltage of the bus falls due to single-phase faults when the judgment is missed can be effectively avoided.
When the motor enters the action state, the three-phase voltage is recovered as a judgment basis, so that the condition that the motor is not successfully started under the condition of phase loss or low voltage can be effectively avoided, the condition that secondary faults occur to the healthy phase voltage is further avoided, and the restarting safety can be effectively ensured.
In some embodiments, when the motor is in the ready state, the three-phase current of the motor has no current, and the motor is controlled to enter the initial state. According to the mode, when the motor is in a ready state, the three-phase current of the motor has no current, namely the motor is controlled to enter an initial state, and subsequent judgment on the voltage and the position of the contactor is not continued. According to the mode, the current and the voltage are judged, the closing and opening states of the contactor are also judged in an auxiliary mode, namely, the auxiliary monitoring of the state of the contactor is added, and under the condition that the motor is not restarted successfully, problems can be conveniently checked and events can be conveniently traced.
In some embodiments, the motor is controlled to enter the initial state when the motor is in the starting state and any one of the following conditions occurs:
voltage collapse time tVoltage collapseExceeds the preset time t2；
Or the three-phase voltage exceeds the preset time t2Not recovered;
or the contactor is in a closing state; the initial state is returned.
In this way, when the motor is in a starting state, a voltage collapse time t occursVoltage collapseExceeds the preset time t2(ii) a Or the three-phase voltage exceeds the preset time t2Not recovered; or the contactor is in the closing state, namely the motor is controlled to enter the initial state instead of the subsequent stateThe safety of restarting can be effectively improved by the action state.
In some embodiments, the preset time t1The value range of (A) is 10ms-20 ms. In this way, by presetting the time t1The value range of the voltage can be set to be 10ms-20ms, and the voltage collapse state which causes the return of the contactor can be reliably captured.
In some embodiments, the preset time t2The value range of (a) is 100ms-500 ms. In this way, by presetting the time t2The value range of the voltage can be set to be 100ms-500ms, and the voltage collapse state which causes the return of the contactor can be reliably captured.
In some embodiments, the preset time t3The value range of (1) is two power frequency periods. In this way, by presetting the time t3The value range is set to be two power frequency periods, and the recovery time t after the three-phase voltage is recovered can be effectively ensuredRecovery. Wherein, two power frequency periods are 40ms in China at present.
In some embodiments, the preset time t4Is in the range of 500 ms. In this way, by presetting the time t4The value range of (1) is set to be 500ms, so that the duration time of the action state can be effectively ensured.
Example 2
As shown in fig. 3, the present invention provides a control device for anti-interference restart of a motor, which executes any one of the above control methods; the control device includes:
the three-phase current split-phase acquisition unit 20, the three-phase voltage split-phase acquisition unit 30, the contactor position switching value acquisition unit 40, the timing unit 50 and the relay outlet module 60 are arranged in parallel and connected with the controller 10;
a three-phase current split-phase acquisition unit 20 for split-phase acquisition of three-phase current;
a three-phase voltage split-phase acquisition unit 30 for split-phase acquiring a three-phase voltage;
the contactor position switching value acquisition unit 40 is used for acquiring the state of a normally open contact of the contactor;
a timing unit 50 for recording the durations t respectivelyPersistenceVoltage collapse time tVoltage collapseRecovery time tRecoveryAnd time t of action stateMovement of；
A relay outlet module 60, a relay module for controlling the closing of the contactor.
The control device can comprehensively judge the current, the voltage and the position of the contactor by matching with the control method, and correctly identify the state moment of the bus voltage collapse and recovery, namely the initial and end processes of the voltage collapse, so as to correctly implement the restarting control on the motor.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A control method for restarting a motor in an anti-interference manner is characterized by comprising the following steps: the control method comprises the following steps:
when the motor is in an initial state of restarting, judging whether the motor is in a normal running state or not according to the current variation trend of the motor; when the motor is in a normal running state, controlling the motor to enter a restarting ready state;
when any one phase voltage of the three-phase voltages of the bus falls and the duration t is upPersistenceExceeds the preset time t1Then, the motor is controlled to enter a restarting state and a voltage collapse time t is startedVoltage collapseTiming;
when the voltage collapse time tVoltage collapseDoes not exceed the preset time t2The three-phase voltages are all recovered, and the recovery time t isRecoveryLasting for more than a preset time t3When the motor is restarted, the contactor is controlled to be switched on, the motor is controlled to enter the restarting action state, and the action state time t is startedMovement ofTiming;
when the action state time tMovement ofReaches the preset time t4And controlling the motor to enter the initial state.
2. The judgment method according to claim 1, wherein: when the motor is in the ready state, the three-phase current of the motor has no current, and the motor is controlled to enter the initial state.
3. The judgment method according to claim 1, wherein: when the motor is in the starting state, controlling the motor to enter the initial state when any one of the following conditions occurs:
the voltage collapse time tVoltage collapseExceeds the preset time t2；
Or the three-phase voltage exceeds the preset time t2Not recovered;
or the contactor is in a closing state; the initial state is returned.
4. The judgment method according to claim 1, wherein: the preset time t1The value range of (A) is 10ms-20 ms.
5. The judgment method according to claim 1, wherein: the preset time t2The value range of (a) is 100ms-500 ms.
6. The judgment method according to claim 1, wherein: the preset time t3The value range of (1) is two power frequency periods.
7. The judgment method according to claim 1, wherein: the preset time t4Is in the range of 500 ms.
8. A control device for realizing electric motor anti-interference restarting is characterized in that: performing the control method of any one of claims 1-8; the control device includes:
the three-phase current split-phase acquisition unit (20), the three-phase voltage split-phase acquisition unit (30), the contactor position switching value acquisition unit (40), the timing unit (50) and the relay outlet module (60) are arranged in parallel and connected with the controller (10);
the three-phase current split-phase acquisition unit (20) is used for split-phase acquisition of the three-phase current;
the three-phase voltage split-phase acquisition unit (30) is used for split-phase acquisition of the three-phase voltage;
the contactor position switching value acquisition unit (40) is used for acquiring the state of a normally open contact of the contactor;
the timing unit (50) is used for respectively recording the duration time tPersistenceVoltage collapse time tVoltage collapseRecovery time tRecoveryAnd time t of action stateMovement of；
The relay outlet module (60) is used for controlling the relay module for closing the contactor.
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| CN201911152373.XA CN110932603B (en) | 2019-11-22 | 2019-11-22 | Control method and control device for anti-interference restarting of motor |
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| CN201911152373.XA CN110932603B (en) | 2019-11-22 | 2019-11-22 | Control method and control device for anti-interference restarting of motor |
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| CN110932603B CN110932603B (en) | 2021-08-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112881788A (en) * | 2021-02-24 | 2021-06-01 | 深圳市中电软件有限公司 | Motor restarting method and system based on electric dazzling rapid identification method |
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