CN113422348B - Temperature limit value determining method, permanent magnet synchronous motor control method and device - Google Patents
Temperature limit value determining method, permanent magnet synchronous motor control method and device Download PDFInfo
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- CN113422348B CN113422348B CN202110638828.XA CN202110638828A CN113422348B CN 113422348 B CN113422348 B CN 113422348B CN 202110638828 A CN202110638828 A CN 202110638828A CN 113422348 B CN113422348 B CN 113422348B
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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
- H02H7/0852—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 directly responsive to abnormal temperature by using a temperature sensor
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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
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/66—Controlling or determining the temperature of the rotor
- H02P29/662—Controlling or determining the temperature of the rotor the rotor having permanent magnets
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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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
- H02P6/085—Arrangements for controlling the speed or torque of a single motor in a bridge configuration
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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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/34—Modelling or simulation for control purposes
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Abstract
The invention discloses a method for determining a temperature limit value, a method and a device for controlling a permanent magnet synchronous motor. The method for determining the temperature limit value of the permanent magnet synchronous motor comprises the following steps: setting operation parameters of a permanent magnet synchronous motor according to parameter values corresponding to a target operation interval, switching the operation mode of the permanent magnet synchronous motor to a fault mode, and determining a temperature limit value corresponding to the fault mode according to the variation of an electromagnetic performance index after switching to the fault mode; and determining a temperature limit corresponding to the target operation interval according to the temperature limit corresponding to at least one fault mode. According to the invention, the temperature limit values of the permanent magnet synchronous motor in different operation intervals are determined according to different fault modes, so that the corresponding temperature limit values can be switched in real time in different operation intervals of the permanent magnet synchronous motor, and the permanent magnet synchronous motor is ensured to still maintain higher reliability against various fault risks in the whole life cycle.
Description
Technical Field
The present invention relates to the field of permanent magnet synchronous motors, and in particular, to a method for determining a temperature limit value of a permanent magnet synchronous motor, a method and a device for controlling a permanent magnet synchronous motor, a fan generator set, and a computer readable storage medium.
Background
Permanent magnet synchronous motors are widely used in industrial production because of their high power density and high efficiency. During operation of the permanent magnet synchronous motor, various losses such as copper loss, iron loss, permanent magnet eddy current loss, etc. may raise the temperature of each component. When the temperature exceeds the allowable range of the material, irreversible damage may occur to the component, so that the motor performance is degraded or even damaged. The rare earth permanent magnet commonly used in the existing permanent magnet synchronous motor is sensitive to temperature rise, and irreversible demagnetization can be generated when the temperature of the permanent magnet is too high, especially when short circuit faults occur simultaneously. Therefore, a temperature limit is usually set, and when the temperature limit is approached or exceeded, appropriate regulation is performed, for example, the motor is controlled to stop running immediately, so as to ensure the safety of the motor, and the motor is restarted after the temperature of the motor is reduced to the temperature limit.
However, the short-circuit current intensity in the short-circuit fault mode may be greater, and if the fixed temperature limit value set previously is followed, the safety of the motor may not be ensured. In some cases, short-circuit currents of a smaller intensity may also occur, which, if in accordance with the previously set fixed temperature limit, may lead to an excessively large motor design margin, thereby degrading the motor's operational performance.
Disclosure of Invention
The invention aims to overcome the defects that the safety of a motor cannot be ensured or the running performance of the motor is reduced due to the fact that the temperature limit value of a permanent magnet synchronous motor is fixed in the prior art, and provides a method for determining the temperature limit value, a method and a device for controlling the permanent magnet synchronous motor.
The invention solves the technical problems by the following technical scheme:
the first aspect of the invention provides a method for determining a temperature limit value of a permanent magnet synchronous motor, which comprises the following steps:
setting the operation parameters of the permanent magnet synchronous motor according to the parameter values corresponding to the target operation intervals, wherein the target operation intervals are any one of the operation intervals, and the operation intervals are determined by the parameter values of the permanent magnet synchronous motor which can possibly operate;
switching the operation mode of the permanent magnet synchronous motor to a fault mode, and determining a temperature limit value corresponding to the fault mode according to the variation of the electromagnetic performance index after switching to the fault mode;
and determining a temperature limit corresponding to the target operation interval according to the temperature limit corresponding to at least one fault mode.
Optionally, the determining method further includes:
aiming at least one operation parameter, acquiring a parameter value of the possible operation of the permanent magnet synchronous motor;
respectively determining subintervals corresponding to each operation parameter according to the acquired parameter values;
and combining all the subintervals to obtain an operation interval.
Optionally, the step of setting the operation parameter of the permanent magnet synchronous motor according to the parameter value corresponding to the target operation interval specifically includes:
setting the operation parameters of the permanent magnet synchronous motor according to the average parameter values of target subintervals, wherein the target subintervals are subintervals corresponding to the target operation intervals.
Optionally, the step of determining the temperature limit value corresponding to the fault mode according to the variation of the electromagnetic performance index after switching to the fault mode includes:
calculating the variation of the electromagnetic performance index after switching to the fault mode at the preset temperature;
and adjusting the preset temperature according to the variation of the electromagnetic performance index, and determining a temperature limit value corresponding to the fault mode according to the adjusted preset temperature.
Optionally, the step of adjusting the preset temperature according to the variation of the electromagnetic performance index, and determining the temperature limit value corresponding to the fault mode according to the adjusted preset temperature specifically includes:
if the variation of the electromagnetic performance index does not meet the condition, reducing the preset temperature until the variation of the electromagnetic performance index at the preset temperature meets the condition, and setting the finally reduced preset temperature as a temperature limit value corresponding to the fault mode;
or if the variation of the electromagnetic performance index meets the condition, raising the preset temperature until the variation of the electromagnetic performance index at the preset temperature does not meet the condition, and setting the preset temperature before the last raising as a temperature limit value corresponding to the fault mode.
Optionally, the step of determining the temperature limit value corresponding to the target operation interval according to the temperature limit value corresponding to the at least one fault mode specifically includes:
and taking the minimum value of the temperature limit values corresponding to at least one fault mode as the temperature limit value corresponding to the target operation interval.
Optionally, the operating parameters include at least one of: rotational speed, stator current amplitude, phase angle.
Optionally, the fault mode includes a three-phase short circuit fault mode, a two-phase short circuit fault mode, a single-phase short circuit fault mode, or a single-phase open circuit fault mode.
Optionally, the electromagnetic performance index includes an average electromagnetic torque, a back emf, a torque ripple, a cogging torque, or an eddy current loss.
A second aspect of the present invention provides a control method of a permanent magnet synchronous motor, including the steps of:
monitoring the operation parameters and the operation temperature of the permanent magnet synchronous motor;
and if the operating temperature exceeds the temperature limit value corresponding to the operating parameter, controlling the permanent magnet synchronous motor to stop operating.
Optionally, if the operating temperature exceeds a temperature limit value corresponding to the operating parameter, the step of controlling the permanent magnet synchronous motor to stop operating specifically includes:
determining a target operation interval corresponding to the operation parameter;
and if the operating temperature exceeds the temperature limit value corresponding to the target operating interval, controlling the permanent magnet synchronous motor to stop operating.
Optionally, the temperature limit value corresponding to the target operation interval is determined by using the determination method described in the first aspect.
A third aspect of the present invention provides a control device for a permanent magnet synchronous motor, including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the control method for a permanent magnet synchronous motor when executing the computer program.
A fourth aspect of the present invention provides a wind generating set, including a permanent magnet synchronous motor and a control device of the permanent magnet synchronous motor provided in the third aspect, where the control device is electrically connected with the permanent magnet synchronous motor.
A fifth aspect of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method for determining a temperature limit value of a permanent magnet synchronous motor according to the first aspect or the method for controlling a permanent magnet synchronous motor according to the second aspect.
The invention has the positive progress effects that: dividing a plurality of operation intervals according to the parameter values of the possible operation of the permanent magnet synchronous motor, and determining the temperature limit value corresponding to each operation interval. Specifically, for a target operation interval, setting operation parameters of the permanent magnet synchronous motor according to parameter values corresponding to the target operation interval, determining temperature limit values corresponding to fault modes according to variation amounts of electromagnetic performance indexes before and after switching to at least one fault mode, and determining temperature limit values corresponding to the target operation interval according to the temperature limit values corresponding to all fault modes, so that different temperature limit values are switched in real time in different operation intervals of the permanent magnet synchronous motor, and high reliability of the permanent magnet synchronous motor in the whole life cycle facing to various fault risks is ensured.
Drawings
Fig. 1 is a flowchart of a method for determining a temperature limit of a permanent magnet synchronous motor according to embodiment 1 of the present invention.
Fig. 2 is a schematic partial structure of a permanent magnet synchronous motor according to embodiment 1 of the present invention.
Fig. 3 is a schematic circuit diagram of the permanent magnet synchronous motor according to embodiment 1 of the present invention in a three-phase short-circuit fault mode.
Fig. 4 is a schematic circuit diagram of the permanent magnet synchronous motor according to embodiment 1 of the present invention in a two-phase short-circuit fault mode.
Fig. 5 is a schematic diagram of a demagnetization curve of a permanent magnet material from 60 ℃ to 85 ℃ provided in embodiment 1 of the present invention.
Fig. 6 is a schematic current diagram of the permanent magnet synchronous motor provided in embodiment 1 of the present invention in a three-phase short-circuit fault mode.
Fig. 7 is a schematic diagram of demagnetization distribution after switching the permanent magnet synchronous motor to the failure mode according to embodiment 1 of the present invention.
Fig. 8 is a graph showing the comparison effect of the average electromagnetic torque of the permanent magnet synchronous motor provided in embodiment 1 of the present invention before and after demagnetization.
Fig. 9 is a schematic diagram of a partial structure of a double three-phase permanent magnet synchronous motor according to embodiment 1 of the present invention.
Fig. 10 is a schematic circuit diagram of a three-phase short-circuit fault mode of the double three-phase permanent magnet synchronous motor provided in embodiment 1 of the present invention under a normal operation condition.
Fig. 11 is a schematic circuit diagram of a three-phase short-circuit fault mode of the double three-phase permanent magnet synchronous motor provided in embodiment 1 of the present invention under a fault-tolerant operation condition.
Fig. 12 is a flowchart of a control method of a permanent magnet synchronous motor according to embodiment 2 of the present invention.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
Example 1
The embodiment provides a method for determining a temperature limit value of a permanent magnet synchronous motor, as shown in fig. 1, comprising the following steps S101 to S103:
step S101, setting the operation parameters of the permanent magnet synchronous motor according to the parameter values corresponding to the target operation interval. The target operation interval is any one of operation intervals, and the operation interval is determined by a parameter value of possible operation of the permanent magnet synchronous motor.
In implementations, the operating parameters may include rotational speed, stator current magnitude, phase angle, and the like. In one specific example, the operating parameters include only rotational speed. In another specific example, the operating parameters include rotational speed and stator current amplitude. In another specific example, the operating parameters include rotational speed, stator current magnitude, and phase angle.
It should be noted that, the parameter values that the permanent magnet synchronous motor may operate refer to parameter values that the permanent magnet synchronous motor may operate in a life cycle in a practical application process. The permanent magnet synchronous motor can be applied to the fields of wind power generation, aerospace and the like.
The method comprises the steps of determining a plurality of operation intervals of the permanent magnet synchronous motor according to parameter values of different operation parameters, wherein the target operation interval is one of the operation intervals. Steps S101 to S103 are performed once for the target operation region R1, and a temperature limit corresponding to the target operation region R1 can be determined. For the target operation region R2, it is necessary to repeatedly execute steps S101 to S103 to determine a temperature limit value corresponding to the target operation region R2.
In an alternative embodiment, before step S101, the above determination method further includes the following steps S100a to S100c:
step S100a, for at least one operation parameter, obtaining a parameter value of the permanent magnet synchronous motor that may be operated. In specific implementation, the parameter values of each operation parameter of the permanent magnet synchronous motor under different working conditions can be recorded for acquisition.
Step S100b, determining subintervals corresponding to each operation parameter according to the acquired parameter values. For each operation parameter, the obtained parameter values may be equally or unequally divided, so as to obtain a subinterval corresponding to the operation parameter. In a specific example, the possible running rotation speed n of the permanent magnet synchronous motor is 0-100 r/min, and the permanent magnet synchronous motor can be equally divided to obtain 5 subintervals corresponding to the rotation speed, wherein the subintervals are 0<n-20 r/min, 21-40 r/min, 41-60 r/min, 61-80 r/min and 81-100 r/min respectively.
And step S100c, combining all the subintervals to obtain an operation interval. Specifically, all the subintervals corresponding to all the operation parameters are combined, so that a plurality of operation intervals are obtained. In a specific example, the rotation speed of the permanent magnet synchronous motor corresponds to 5 subintervals, and the stator current amplitude corresponds to 4 subintervals, so that 5*4 =20 operation intervals can be obtained after the combination.
The permanent magnet synchronous motor includes a rotor core, a permanent magnet, a stator core, and a stator winding. In a specific example, the single three-phase permanent magnet synchronous motor comprises 180 pole 540 slots, the partial structure of which is shown in fig. 2, for the rotation speed n and the stator current amplitude I m Phase angle
And the three operation parameters are used for respectively acquiring the parameter values of the permanent magnet synchronous motor which can possibly operate. The rotational speed is divided into 3 sub-intervals, the stator current amplitude is divided into 3 sub-intervals, and the phase angle is divided into 3 sub-intervals according to the obtained parameter values, as shown in table 1.
TABLE 1
Combining the 9 subintervals corresponding to the three operating parameters can obtain 3×3×3=27 operating intervals.
In the implementation of step S101, the operation parameters of the permanent magnet synchronous motor may be set according to the average parameter value of the target subinterval, the operation parameters of the permanent magnet synchronous motor may be set according to the maximum parameter value of the target subinterval, and the operation parameters of the permanent magnet synchronous motor may be set according to the minimum parameter value of the target subinterval. The target subinterval is a subinterval corresponding to the target operation interval.
In the above example, the average parameter value of each subinterval in table 1 may be taken as the steady-state operation parameter value of the corresponding subinterval, as shown in table 2.
TABLE 2
The 9 sub-intervals were combined to obtain 27 operating intervals, and steady-state operating parameter values for the 27 operating intervals are shown in table 3.
TABLE 3 Table 3
Taking the #27 operation section as an example, the corresponding subintervals include subinterval #3 corresponding to the rotation speed, subinterval #3 corresponding to the stator current amplitude, and subinterval #3 corresponding to the phase angle. The method comprises the steps of setting the rotating speed of a permanent magnet synchronous motor according to an average parameter value of 8.33r/min of a subinterval #3 corresponding to the rotating speed, setting the stator current amplitude of the permanent magnet synchronous motor according to an average parameter value of 9.33kA of the subinterval #3 corresponding to the stator current amplitude, and setting the phase angle of the permanent magnet synchronous motor according to an average parameter value-205 deg of the subinterval #3 corresponding to the phase angle. In a specific implementation, the rotational speed of the magnetic synchronous motor can be set to 8.33r/min, the stator current amplitude to 9.33kA and the phase angle to-205 deg by simulation software.
Step S102, switching the operation mode of the permanent magnet synchronous motor to a fault mode, and determining a temperature limit value corresponding to the fault mode according to the variation of the electromagnetic performance index after switching to the fault mode. The variation of the electromagnetic performance index refers to an absolute value of a difference between the electromagnetic performance index after switching to the failure mode and the electromagnetic performance index before switching to the failure mode.
In implementations, the fault modes may include a three-phase short circuit fault mode, a two-phase short circuit fault mode, a single-phase open circuit fault mode, and the like. In the example of the permanent magnet synchronous motor shown in fig. 2, the circuit structure of the three-phase short-circuit fault mode is shown in fig. 3, and the circuit structure of the two-phase short-circuit fault mode is shown in fig. 4.
Wherein the electromagnetic performance index comprises average electromagnetic torque, back electromotive force, torque fluctuation, cogging torque, eddy current loss and the like.
In the implementation of step S102, the following steps S102a and S102b may be included:
step S102a, calculating the variation of the electromagnetic performance index after switching to the fault mode at the preset temperature. In a specific implementation, the preset temperature may be set according to the temperature of the permanent magnet synchronous motor in the rated state.
Step S102b, adjusting the preset temperature according to the variation of the electromagnetic performance index, and determining a temperature limit value corresponding to the fault mode according to the adjusted preset temperature.
In an alternative implementation manner of step S102b, if the variation of the electromagnetic performance index does not meet the condition, the preset temperature is reduced until the variation of the electromagnetic performance index at the preset temperature meets the condition, and the finally reduced preset temperature is set as the temperature limit value corresponding to the fault mode.
In an alternative embodiment of step S102b, if the variation of the electromagnetic performance index meets the condition, the preset temperature is raised until the variation of the electromagnetic performance index at the preset temperature does not meet the condition, and the preset temperature before the last rise is set as the temperature limit value corresponding to the fault mode.
In a specific implementation, if (the variation of the electromagnetic performance index/the electromagnetic performance index before switching to the fault mode) ×100% is greater than a preset threshold, the variation of the electromagnetic performance index is considered to be unsatisfied with the condition; if (variation of electromagnetic performance index/electromagnetic performance index before switching to failure mode) ×100% is less than or equal to a preset threshold, the variation of electromagnetic performance index is considered to satisfy the condition.
In the implementation of step S102b, the adjustment step of the preset temperature may be set to Δt, for example, by decreasing the preset temperature by Δt each time, or by increasing the preset temperature by Δt each time. The selection of the adjustment step length delta T can be comprehensively considered by referring to the conditions of the temperature coefficient of the permanent magnet material, the requirements of motor application occasions, the accuracy requirements of electromagnetic performance indexes and the like.
Fig. 5 is used to show the demagnetization curve of the permanent magnet material from 60 ℃ to 85 ℃. Fig. 6 is used to illustrate the current of a permanent magnet synchronous motor in a three-phase short circuit fault mode. Fig. 7 is a graph showing the demagnetization profile after switching the permanent magnet synchronous motor to the failure mode. Fig. 8 is a graph for illustrating the comparative effect of the average electromagnetic torque of the permanent magnet synchronous motor before and after demagnetization.
In the example in which the #27 operation interval is the target operation interval, the preset temperature is set to 70 ℃, the operation mode of the permanent magnet synchronous motor is switched to the three-phase short-circuit fault mode, and the generated three-phase current is shown in fig. 6. Referring to fig. 5, the average electromagnetic torque before the permanent magnet material is calculated to be 70 ℃ for the demagnetization curve and before the permanent magnet material is switched to the three-phase short-circuit fault mode is calculated to be 12.51MNm, the permanent magnet of the permanent magnet synchronous motor is demagnetized after the permanent magnet material is switched to the three-phase short-circuit fault mode, the demagnetization distribution is shown in fig. 7, gray in the figure represents a non-demagnetized part of the permanent magnet, and black represents a demagnetized part of the permanent magnet. The average electromagnetic torque after demagnetization was calculated to be 12.40MNm, and the comparative effects before and after demagnetization are shown in fig. 8. Since (variation of electromagnetic performance index/electromagnetic performance index before switching to failure mode) ×100% = (12.51-12.40)/12.51×100% = 0.88% is greater than the preset threshold value 0.5%, the preset temperature is sequentially reduced by Δt=5 ℃ until the variation of electromagnetic performance index satisfies the condition that (variation of electromagnetic performance index/electromagnetic performance index before switching to failure mode) ×100% is less than or equal to the preset threshold value 0.5%. In actual calculation, when the preset temperature is reduced to 60 ℃, the variation of the electromagnetic performance index meets the condition. Therefore, 60 ℃ is taken as the temperature limit corresponding to the three-phase short-circuit fault mode.
Step S103, determining a temperature limit value corresponding to the target operation interval according to the temperature limit value corresponding to at least one fault mode.
In the above example, steps S101 to S103 are repeatedly performed for the two-phase short-circuit fault mode, the single-phase short-circuit fault mode, and the single-phase open-circuit fault mode, respectively, to obtain a temperature limit value corresponding to the two-phase short-circuit fault mode of 70 ℃, a temperature limit value corresponding to the single-phase short-circuit fault mode of 60 ℃, and a temperature limit value corresponding to the single-phase open-circuit fault mode of 75 ℃.
In some cases where the reliability requirements are very high, the minimum value of the temperature limits corresponding to at least one failure mode may be taken as the temperature limit corresponding to the target operating interval. In the above example, the temperature limit values corresponding to the four failure modes are 60 ℃, 70 ℃, 60 ℃, 75 ℃, respectively, and the minimum value 60 ℃ among them is taken as the temperature limit value corresponding to the #27 operation section.
In some occasions with higher reliability requirements, the temperature limits may be weighted and summed according to the probability distribution of the failure mode corresponding to each temperature limit, so as to obtain the temperature limit corresponding to the target operation interval. In the above example, the probability of occurrence of a three-phase short-circuit fault was counted to be 0.1, the probability of occurrence of a two-phase short-circuit fault was counted to be 0.3, the probability of occurrence of a single-phase short-circuit fault was counted to be 0.2, and the probability of occurrence of a single-phase open-circuit fault was counted to be 0.4. Then the temperature limits corresponding to the four failure modes are weighted and summed to obtain 60 ℃. 0.1+70 ℃. 0.3+60 ℃. 0.2+75 ℃. 0.4=69 ℃, 69 ℃ being the temperature limit corresponding to the #27 operating interval.
In some cases where reliability requirements are generally or fail-safe, an average value, root mean square, or median of the temperature limits corresponding to at least one failure mode may also be used as the temperature limit corresponding to the target operating interval.
It should be noted that, in this embodiment, the temperature limit value determined according to the variation of the electromagnetic performance index is actually the temperature limit value of the permanent magnet in the permanent magnet synchronous motor. Because the permanent magnet is sensitive to temperature rise, in the practical application of the permanent magnet synchronous motor, the temperature limit value of the permanent magnet can be used as the temperature limit value of the permanent magnet synchronous motor.
In this embodiment, the temperature limit values of the permanent magnet synchronous motor in different operation intervals are determined according to different fault modes, so that corresponding temperature limit values can be switched in real time in different operation intervals of the permanent magnet synchronous motor, and it is ensured that the permanent magnet synchronous motor can still maintain higher reliability in the whole life cycle against various fault risks.
The method for determining the temperature limit value of the permanent magnet synchronous single machine is described below by taking a double three-phase permanent magnet synchronous motor as an example.
The double three-phase permanent magnet synchronous motor in this example has the same geometric dimensions as the single three-phase permanent magnet synchronous motor in the above example, except for the difference in winding structure. The partial structure of the double three-phase permanent magnet synchronous motor is shown in fig. 9, the white part is one set of windings, and the gray part is the other set of windings. For a double three-phase permanent magnet synchronous motor structure, it is generally assumed that the stator current amplitude of each set of windings is half that of a single three-phase permanent magnet synchronous motor, while the phase angle remains unchanged. The steady state operating parameters for 27 operating intervals in the double three phase permanent magnet synchronous motor are shown in table 4.
TABLE 4 Table 4
Unlike the single-phase permanent magnet synchronous motor described above, the double-phase permanent magnet synchronous motor has two operating conditions: the dual winding operating condition is a normal operating condition, and the single winding operating condition is a fault tolerant operating condition.
And for the double-winding operation working condition, namely the normal operation working condition, switching one set of windings into different fault modes, maintaining normal current for the other set of windings, and repeating the steps S101-S103 to obtain temperature limit values corresponding to different operation intervals under the normal operation working condition. In the example of the double three-phase permanent magnet synchronous motor shown in fig. 9, the circuit structure of the double three-phase permanent magnet synchronous motor in the three-phase short circuit fault mode under the normal operation condition is shown in fig. 10. For 27 operation intervals of the double-three-phase permanent magnet synchronous motor under the normal operation working condition, the double-three-phase permanent magnet synchronous motor is respectively switched into a three-phase short-circuit fault mode, a two-phase short-circuit fault mode, a single-phase short-circuit fault mode and a single-phase open-circuit fault mode, and calculated temperature limit values are shown in table 5.
TABLE 5
For a single winding operation condition, namely a fault tolerant operation condition, one set of windings is in an open circuit, and only one set of windings can work normally. And repeating the steps S101 to S103 for the windings which can work normally, so that the temperature limit values corresponding to different operation intervals under the fault-tolerant operation condition can be obtained. In the example of the double three-phase permanent magnet synchronous motor shown in fig. 9, the circuit structure of the three-phase short-circuit fault mode under the fault-tolerant operation condition is shown in fig. 11. For 27 operation intervals of the double three-phase permanent magnet synchronous motor under the fault-tolerant operation working condition, the double three-phase permanent magnet synchronous motor is respectively switched into a three-phase short-circuit fault mode, a two-phase short-circuit fault mode, a single-phase short-circuit fault mode and a single-phase open-circuit fault mode, and calculated temperature limit values are shown in table 6.
TABLE 6
| Sequence number of operation section | Temperature (. Degree. C.) | Sequence number of operation section | Temperature (. Degree. C.) | Sequence number of operation section | Temperature (. Degree. C.) |
| #1 | 80 | #10 | 70 | #19 | 65 |
| #2 | 80 | #11 | 70 | #20 | 65 |
| #3 | 80 | #12 | 70 | #21 | 65 |
| #4 | 75 | #13 | 65 | #22 | 60 |
| #5 | 75 | #14 | 65 | #23 | 60 |
| #6 | 75 | #15 | 65 | #24 | 60 |
| #7 | 70 | #16 | 65 | #25 | 50 |
| #8 | 70 | #17 | 65 | #26 | 50 |
| #9 | 70 | #18 | 65 | #27 | 50 |
For the double three-phase permanent magnet synchronous motor, under the normal operation condition and the fault-tolerant operation condition, the temperature limit values of the permanent magnet synchronous motor in different operation intervals are respectively determined according to different fault modes, so that the corresponding temperature limit values can be switched in real time in different operation intervals of different operation conditions of the permanent magnet synchronous motor, and the permanent magnet synchronous motor can still keep higher reliability in the whole life cycle against various fault risks.
Example 2
The present embodiment provides a control method of a permanent magnet synchronous motor, as shown in fig. 12, including the following steps S201 to S203:
step S201, monitoring the operation parameters and the operation temperature of the permanent magnet synchronous motor.
Step S202, judging whether the operation temperature exceeds a temperature limit value corresponding to the operation parameter, if yes, executing step S203, otherwise, returning to step S201, and continuously monitoring the operation parameter and the operation temperature of the permanent magnet synchronous motor.
In an alternative embodiment, step S202 specifically includes:
step S202a, determining a target operation interval corresponding to the operation parameter;
step S202b, determining that the operating temperature exceeds a temperature limit corresponding to the target operating interval.
In this embodiment, different temperature limits are switched in real time according to the operation interval of the permanent magnet synchronous motor, so that the permanent magnet synchronous motor is ensured to be still capable of maintaining higher reliability in the whole life cycle against various fault risks.
In an alternative embodiment, the temperature limit value corresponding to the target operation interval in step S202b is determined by using the method for determining the temperature limit value of the permanent magnet synchronous motor in example 1. In the method for determining the temperature limit value of the permanent magnet synchronous motor in embodiment 1, the temperature limit value determined according to the variation of the electromagnetic performance index is actually the temperature limit value of the permanent magnet in the permanent magnet synchronous motor. Because the permanent magnet is sensitive to temperature rise, in the practical application of the permanent magnet synchronous motor, the temperature limit value of the permanent magnet can be used as the temperature limit value of the permanent magnet synchronous motor.
And step 203, controlling the permanent magnet synchronous motor to stop running.
The embodiment also provides a control device of the permanent magnet synchronous motor, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the control method of the permanent magnet synchronous motor is realized when the processor executes the computer program.
Example 3
The embodiment provides a wind generating set, which comprises a permanent magnet synchronous motor and the control device of the permanent magnet synchronous motor in embodiment 2. The control device is electrically connected with the permanent magnet synchronous motor and used for controlling the operation of the permanent magnet synchronous motor.
In this embodiment, different temperature limits can be switched in real time according to the operation interval of the permanent magnet synchronous motor, so that the permanent magnet synchronous motor can still keep higher reliability in the whole life cycle in the face of multiple fault risks, and meanwhile, the permanent magnet synchronous motor can be ensured to fully generate power in the operation state with smaller risk.
Example 4
The present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method of determining the temperature limit value of the permanent magnet synchronous motor of embodiment 1 or the method of controlling the permanent magnet synchronous motor of embodiment 2.
More specifically, among others, readable storage media may be employed including, but not limited to: portable disk, hard disk, random access memory, read only memory, erasable programmable read only memory, optical storage device, magnetic storage device, or any suitable combination of the foregoing.
In a possible embodiment, the invention can also be realized in the form of a program product comprising program code for causing a terminal device to carry out the method for determining the temperature limit value of the permanent magnet synchronous motor of example 1 or the method for controlling the permanent magnet synchronous motor of example 2, when said program product is run on the terminal device.
Wherein the program code for carrying out the invention may be written in any combination of one or more programming languages, which program code may execute entirely on the user device, partly on the user device, as a stand-alone software package, partly on the user device and partly on the remote device or entirely on the remote device.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (13)
1. The method for determining the temperature limit value of the permanent magnet synchronous motor is characterized by comprising the following steps of:
setting the operation parameters of the permanent magnet synchronous motor according to the parameter values corresponding to the target operation intervals, wherein the target operation intervals are any one of the operation intervals, and the operation intervals are determined by the parameter values of the permanent magnet synchronous motor which can possibly operate;
switching the operation mode of the permanent magnet synchronous motor to a fault mode, and determining a temperature limit value corresponding to the fault mode according to the variation of electromagnetic performance indexes before and after switching to the fault mode; the change amount of the electromagnetic performance index is determined according to the electromagnetic performance index after switching to the fault mode and the electromagnetic performance index before switching to the fault mode;
and determining a temperature limit corresponding to the target operation interval according to the temperature limit corresponding to at least one fault mode.
2. The determination method according to claim 1, wherein the determination method further comprises:
aiming at least one operation parameter, acquiring a parameter value of the possible operation of the permanent magnet synchronous motor;
respectively determining subintervals corresponding to each operation parameter according to the acquired parameter values;
and combining all the subintervals to obtain an operation interval.
3. The method for determining as defined in claim 2, wherein the step of setting the operation parameters of the permanent magnet synchronous motor according to the parameter values corresponding to the target operation interval specifically includes:
setting the operation parameters of the permanent magnet synchronous motor according to the average parameter values of target subintervals, wherein the target subintervals are subintervals corresponding to the target operation intervals.
4. The determination method according to claim 1, wherein the step of determining the temperature limit value corresponding to the failure mode based on the amount of change in the electromagnetic performance index before and after switching to the failure mode includes:
calculating the variation of electromagnetic performance indexes before and after switching to a fault mode at a preset temperature;
and adjusting the preset temperature according to the variation of the electromagnetic performance index, and determining a temperature limit value corresponding to the fault mode according to the adjusted preset temperature.
5. The method of determining as claimed in claim 4, wherein the step of adjusting the preset temperature according to the variation of the electromagnetic performance index and determining the temperature limit corresponding to the failure mode according to the adjusted preset temperature specifically includes:
if the variation of the electromagnetic performance index does not meet the condition, reducing the preset temperature until the variation of the electromagnetic performance index at the preset temperature meets the condition, and setting the finally reduced preset temperature as a temperature limit value corresponding to the fault mode;
or if the variation of the electromagnetic performance index meets the condition, raising the preset temperature until the variation of the electromagnetic performance index at the preset temperature does not meet the condition, and setting the preset temperature before the last raising as a temperature limit value corresponding to the fault mode.
6. The method for determining according to claim 1, wherein the step of determining the temperature limit value corresponding to the target operation section from the temperature limit value corresponding to the at least one failure mode specifically includes:
and taking the minimum value of the temperature limit values corresponding to at least one fault mode as the temperature limit value corresponding to the target operation interval.
7. The determination method according to any one of claims 1 to 6, wherein the operation parameters include at least one of: rotational speed, stator current amplitude, phase angle.
8. The determination method according to any one of claims 1 to 6, wherein the failure mode includes a three-phase short-circuit failure mode, a two-phase short-circuit failure mode, a single-phase short-circuit failure mode, or a single-phase open-circuit failure mode.
9. The determination method according to any one of claims 1 to 6, wherein the electromagnetic performance index includes an average electromagnetic torque, a counter electromotive force, a torque ripple, a cogging torque, or an eddy current loss.
10. The control method of the permanent magnet synchronous motor is characterized by comprising the following steps of:
monitoring the operation parameters and the operation temperature of the permanent magnet synchronous motor;
if the operating temperature exceeds the temperature limit value corresponding to the operating parameter, controlling the permanent magnet synchronous motor to stop operating, wherein the method specifically comprises the following steps:
determining a target operation interval corresponding to the operation parameter;
if the operating temperature exceeds the temperature limit value corresponding to the target operating interval, controlling the permanent magnet synchronous motor to stop operating; wherein the temperature limit value corresponding to the target operation interval is determined using the determination method as set forth in any one of claims 1 to 9.
11. A control device for a permanent magnet synchronous motor comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the control method for a permanent magnet synchronous motor according to claim 10 when executing the computer program.
12. A wind generating set, comprising a permanent magnet synchronous motor and a control device of the permanent magnet synchronous motor according to claim 11, wherein the control device is electrically connected with the permanent magnet synchronous motor.
13. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the method of determining a temperature limit value of a permanent magnet synchronous motor according to any one of claims 1 to 9 or the method of controlling a permanent magnet synchronous motor according to claim 10.
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