CN112713842B - Method for preventing low-frequency overcurrent in rotating speed tracking of asynchronous motor - Google Patents
Method for preventing low-frequency overcurrent in rotating speed tracking of asynchronous motor Download PDFInfo
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- CN112713842B CN112713842B CN202011510195.6A CN202011510195A CN112713842B CN 112713842 B CN112713842 B CN 112713842B CN 202011510195 A CN202011510195 A CN 202011510195A CN 112713842 B CN112713842 B CN 112713842B
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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
- H02P27/047—V/F converter, wherein the voltage is controlled proportionally with the frequency
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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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
Abstract
The invention provides a method for preventing low-frequency overcurrent in the rotating speed tracking of an asynchronous motor. The invention sets the operation frequency as a fixed value higher than the maximum operation frequency, the output voltage is given to be increased gradually according to a certain slope, whether the output current is close to the target sweep frequency current value or not is observed, and the judgment of the sweep frequency stage is carried out; the frequency sweep judging stage gradually reduces the given frequency according to a certain slope, and carries out delay judging processing to enter an excitation delay processing stage; setting current judgment thresholds of different frequency points in the low-frequency current threshold judgment processing; and obtaining a normal target voltage value through a normal V/f curve with the given frequency unchanged, then gradually changing the given voltage value to the target voltage value according to a certain slope, and after finishing the change, performing delay processing to finish the delay. The invention avoids the occurrence of overcurrent phenomenon by processing the low-frequency stage current judgment threshold value, and improves the stability of the system.
Description
Technical Field
The invention belongs to the technical field of asynchronous motor control, and particularly relates to a method for preventing low-frequency overcurrent in the tracking of the rotating speed of an asynchronous motor.
Background
For a motor which rotates at a certain speed before the controller is put into operation, if the controller is directly put into operation, the problem of overcurrent is often caused because the difference between the given frequency and the actual operation speed of the motor is too large. The rotating speed tracking and restarting function is a method for acquiring the operating rotating speed of a rotating motor by a proper method, then switching the operating rotating speed into a normal control flow by certain processing, but in the rotating speed tracking process of an asynchronous motor Vf, frequency judgment errors easily occur at a low-frequency stage, so that the difference between the actual operating speed of the motor and the actual operating speed of the motor is overlarge, and overcurrent is caused by direct starting. Therefore, how to accurately acquire the running speed of the rotating motor in the low-frequency stage is one of the difficulties.
Disclosure of Invention
The invention discloses a method for solving low-frequency overcurrent in a tracking process of controlling the rotating speed of an asynchronous motor Vf in engineering practice, which avoids the occurrence of overcurrent by processing a low-frequency stage current judgment threshold. Compared with the traditional method, the method can obviously solve the overcurrent problem and improve the stability of the system.
The technical scheme of the invention is a method for preventing low-frequency overcurrent in the rotating speed tracking of an asynchronous motor, which comprises the following steps:
step 1: magnetic delay waiting, wherein after the magnetic delay waiting is finished, a target sweep frequency current rising stage is started;
and 2, step: in the target sweep frequency current rising stage, setting the operation frequency as a fixed value higher than the maximum operation frequency, gradually increasing the output voltage according to a certain slope, observing whether the output current is close to the target sweep frequency current value, pausing the increase of the output voltage if the output current is close to the target sweep frequency current value, performing delay judgment processing, and entering a sweep frequency judgment stage if the delay is finished;
and step 3: the frequency sweep judging stage is used for processing according to a certain slope, gradually reducing the given frequency, taking the voltage and the frequency at the end of the previous stage as references, obtaining corresponding output voltage values under different frequencies in an approximately linear mode, observing output current, pausing frequency sweep when the output current value is lower than a set current lower limit threshold value, carrying out time delay judging processing, and if the time delay judging processing is finished, considering that the current given synchronous frequency is close to the running speed of the motor and entering an excitation time delay processing stage;
and 4, step 4: in the low-frequency current threshold value judgment processing, the frequency f is seteSetting a current threshold I at/161Frequency feA current judgment threshold I is set at the position of 82；
And 5: and in the excitation delay processing stage, the given frequency is unchanged, a normal target voltage value is obtained through a normal V/f curve, then the given voltage value is gradually changed to the target voltage value according to a certain slope, and after the given voltage value is changed to the target voltage value, delay processing is carried out, and delay is finished.
The invention discloses a method for solving low-frequency overcurrent in the tracking process of controlling the rotating speed of an asynchronous motor Vf in engineering practice, which avoids the occurrence of overcurrent phenomenon by processing a low-frequency stage current judgment threshold value and improves the stability of a system.
Drawings
FIG. 1: the method of the invention is a flow chart.
FIG. 2: and a magnetic delay waiting method flow chart.
FIG. 3: and (5) processing a flow chart at the rising stage of the target sweep current.
FIG. 4: and processing a flow chart in a frequency sweeping judgment stage.
FIG. 5: current versus frequency setting schematic.
FIG. 6: and excitation delay processing stage flow.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 shows a flow chart of the method of the present invention.
Step 1: and (3) magnetic delay waiting, wherein after the stage is finished, a target sweep frequency current rising stage is started, and a flow chart of the magnetic delay waiting method is shown in fig. 2.
Step 2: and (3) processing a target sweep frequency current rising stage, setting the operating frequency to be a fixed value higher than the maximum operating frequency, gradually increasing the output voltage according to a certain slope, observing whether the output current is close to a target sweep frequency current value, suspending the increase of the output voltage if the output current is close to the target sweep frequency current value, performing delay judgment processing, entering a sweep frequency judgment stage if the delay is finished, and processing a flow chart of the target sweep frequency current rising stage is shown in fig. 3.
And step 3: and (3) performing frequency sweep judgment stage processing, namely gradually reducing the given frequency according to a certain slope, taking the voltage and the frequency at the end of the previous stage as references, obtaining corresponding output voltage values under different frequencies in an approximately linear manner, observing output current, pausing frequency sweep when the output current value is lower than a set current lower limit threshold, performing delay judgment processing, and if the delay judgment processing is finished, considering that the current given synchronous frequency is close to the running speed of the motor, and entering an excitation delay processing stage, wherein the processing flow chart of the frequency sweep judgment stage is shown in fig. 4.
And 4, step 4: low frequency current threshold judgment processing, such a processing is performed at a low frequency f to prevent frequency judgment errorseSetting a current threshold I at/161Frequency feA current judgment threshold I is set at the position of 82A schematic of the current versus frequency setting is shown in fig. 5.
By means of the processing, the phenomenon that the overcurrent is caused by starting due to the fact that the motor running frequency is captured by a system due to misjudgment caused by the fact that the output current is small when the motor running frequency is not captured in the low-frequency stage can be prevented. The phenomenon that in a high-frequency stage, the running frequency of the motor is captured, but the output current of the motor is larger than the current judgment threshold value, so that misjudgment is judged as not being captured, misjudgment is caused, and the overcurrent problem is caused is prevented.
And 5: in the excitation delay processing stage, the given frequency is unchanged, a normal target voltage value is obtained through a normal V/f curve, then the given voltage value is gradually changed to the target voltage value according to a certain slope, after the given voltage value is changed to the target voltage value, delay processing is performed, and after the delay is completed, the flow of the excitation delay processing stage is as shown in fig. 6.
It should be understood that parts of the application not described in detail are prior art.
It should be understood that the above description of the preferred embodiments is given for clearness of understanding and no unnecessary limitations should be understood therefrom, and all changes and modifications may be made by those skilled in the art without departing from the scope of the invention as defined by the appended claims.
Claims (1)
1. A method for preventing low-frequency overcurrent in the rotation speed tracking of an asynchronous motor is characterized by comprising the following steps:
step 1: magnetic delay waiting, wherein after the magnetic delay waiting is finished, a target sweep frequency current rising stage is started;
step 2: the target sweep frequency current rising stage processing is carried out, the operation frequency is set to be a fixed value higher than the maximum operation frequency, the output voltage is given to be increased step by step according to a certain slope, whether the output current is close to the target sweep frequency current value or not is observed, if the output current is close to the target sweep frequency current value, the output voltage is paused to be increased, delay judgment processing is carried out, and if the delay is finished, the sweep frequency judgment stage processing is carried out;
and 3, step 3: the frequency sweep judging stage processing comprises the steps of gradually reducing given frequency according to a certain slope, taking the voltage and the frequency at the end of the previous stage as reference, obtaining corresponding output voltage values under different frequencies in an approximately linear mode, observing output current, pausing frequency sweep when the output current value is lower than a set current judging threshold value, carrying out time delay judging processing, and if the time delay judging processing is finished, considering that the current given synchronous frequency is close to the running speed of the motor and entering the excitation time delay processing stage for processing;
and 4, step 4: judging and processing a low-frequency current judgment threshold, and setting corresponding current judgment thresholds at different frequency points;
and 4, setting corresponding current judgment thresholds at different frequency points, specifically:
at low frequency, below frequency f to prevent frequency misjudgmenteThe set current judgment threshold is constant at I at/161Above frequency feThe set current judgment threshold is constant at I at/82；
And 5: and (3) excitation delay stage processing, namely obtaining a normal target voltage value through a normal V/f curve with the given frequency unchanged, then gradually changing the given voltage value to the target voltage value according to a certain slope, and after finishing the processing, performing delay processing and finishing the delay.
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| CN112713842B true CN112713842B (en) | 2022-07-05 |
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| CN103078563A (en) * | 2013-01-07 | 2013-05-01 | 安徽颐和新能源科技股份有限公司 | Software implementation method for starting runaway of high voltage inverter at fixed frequency |
| DE102014103027A1 (en) * | 2014-03-07 | 2015-09-10 | Baumüller Nürnberg GmbH | Tracking controller for a V / f-controlled asynchronous machine |
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