CN108649550B - Power-down protection control method and device and permanent magnet synchronous motor control system - Google Patents
Power-down protection control method and device and permanent magnet synchronous motor control system Download PDFInfo
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- CN108649550B CN108649550B CN201810527882.5A CN201810527882A CN108649550B CN 108649550 B CN108649550 B CN 108649550B CN 201810527882 A CN201810527882 A CN 201810527882A CN 108649550 B CN108649550 B CN 108649550B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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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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Abstract
The invention provides a power-down protection control method for a permanent magnet synchronous motor control system, a power-down protection control device and the permanent magnet synchronous motor control system. The power failure protection control method comprises the following steps: counting the voltage value of the direct current bus module in real time; judging whether the time length of the voltage value reduced from the first preset voltage value to the second preset voltage value is less than or equal to a first preset time length or not; and when the duration is less than or equal to the first preset duration, setting all switch tubes of the IPM module to be in a high-resistance state. All switch tubes of the IPM module are set to be in a high-resistance state, so that the voltage of the counter electromotive force generated by the permanent magnet synchronous motor instantly and formed on the direct current bus module is lower than the safe voltage, and the situation that the counter electromotive force generated by the permanent magnet synchronous motor forms higher voltage on the direct current bus module due to power failure and damages components is caused is avoided.
Description
Technical Field
The invention relates to the field of motor control, in particular to a power-down protection control method and device for a permanent magnet synchronous motor control system and the permanent magnet synchronous motor control system.
Background
Under the high-speed operation of PMSM and entering weak magnetism state, if the outage of alternating current Power supply side appears, PMSM can produce great back electromotive force to directly charge the direct current bus Module that is used for the Power supply through IPM Module (Intelligent Power Module, is the core part of control PMSM operation), damage appears appearing in direct current bus Module overvoltage may appear.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the present invention is to provide a method for power down protection control.
In a second aspect of the present invention, a power down protection control apparatus is provided.
A third aspect of the present invention is to provide a permanent magnet synchronous motor control system.
In view of the above, according to a first aspect of the present invention, there is provided a method for controlling power down protection for a permanent magnet synchronous motor control system, wherein the permanent magnet synchronous motor control system includes a dc bus module and an IPM module, the dc bus module provides dc power for the IPM module, and the method for controlling power down protection includes: counting the voltage value of the direct current bus module in real time; judging whether the time length of the voltage value reduced from the first preset voltage value to the second preset voltage value is less than or equal to a first preset time length or not; and when the duration is less than or equal to the first preset duration, setting all switch tubes of the IPM module to be in a high-resistance state.
The method for controlling the power failure protection provided by the invention is characterized in that the voltage value of a direct current bus module is counted in real time, whether the power failure condition occurs or not is determined by monitoring the voltage value of the direct current bus module, specifically, whether the time length for reducing the voltage value of the direct current bus module from a first preset voltage value to a second preset voltage value is less than or equal to a first preset time length or not is judged, namely the time length for reducing the voltage value of the direct current bus module from the first preset voltage value to the second preset voltage value within a short time is considered to be the power failure condition, all switching tubes of an IPM module are set to be in a high-resistance value state, so that the voltage formed by the counter electromotive force generated by a permanent magnet synchronous motor at the moment in the direct current bus module is lower than the safety voltage, and the situation that the counter electromotive force generated by the permanent magnet synchronous motor forms higher voltage in the direct current bus module due to the.
In addition, according to the method for controlling power down protection in the above technical solution provided by the present invention, the following additional technical features may also be provided:
in the foregoing technical solution, it is preferable that after all the switching tubes of the IPM module are set to the high resistance state, the method further includes: judging whether the duration of the voltage value greater than the third preset voltage is greater than a second preset duration or not; when the duration is longer than a second preset duration, controlling the switch tube corresponding to the lower bridge arm of the IPM module to be switched on and the switch tube corresponding to the upper bridge arm of the IPM module to be switched off until the permanent magnet synchronous motor is stopped; otherwise, setting all switch tubes of the IPM module to be in a high-resistance state.
In the technical scheme, after all the switch tubes of the IPM module are set to be in a high resistance state, the voltage value of the direct current bus can be increased under the action of back electromotive force of the permanent magnet synchronous motor, in order to avoid overvoltage of the direct current bus module caused by overhigh voltage value of the direct current bus module, whether the duration time of the voltage value larger than a third preset voltage is larger than a second preset duration is judged, and only when the duration time is larger than the second preset duration, the switch tube corresponding to the lower bridge arm of the IPM module is controlled to be switched on and the switch tube corresponding to the upper bridge arm of the IPM module is controlled to be switched off, so that the direct current bus module is separated from the permanent magnet synchronous motor circuit until the permanent magnet synchronous motor stops, and further, the direct current bus module is prevented from being damaged due to overhigh voltage caused by voltage increase of the direct.
In any of the above solutions, preferably, the voltage value is measured by a known resistance connected in parallel to the dc bus module.
In the technical scheme, the voltage value of the direct current bus module can be determined by connecting resistors with known resistance values in parallel on the direct current bus, specifically, the voltage of the resistors is directly measured to directly obtain the voltage of the direct current bus module, so that the states of all switch tubes of the IPM module are determined according to the measurement result, the voltage safety of the direct current bus module is ensured, and the device damage caused by the overhigh voltage of the direct current bus module is avoided.
In any of the above technical solutions, preferably, the IPM module is a three-phase bridge circuit composed of six switching tubes.
In the technical scheme, the IPM module provides electric energy for the permanent magnet synchronous motor, and fault detection circuits such as overvoltage, overcurrent and overheat are integrated inside the IPM module, when the power failure condition is judged, the six internal switching tubes are set to be in a high resistance value state, the voltage generated by the counter electromotive force generated by the permanent magnet synchronous motor under the power failure condition on the direct current bus is reduced, the damage of components is avoided, and further, after the switching tube is set to be in a high-resistance state, whether the duration time that the voltage on the direct current bus module exceeds a third preset voltage is longer than a second preset time length or not is detected, when the time is longer than the second preset time, the switch tube corresponding to the lower bridge arm of the IPM module is controlled to be switched on and switched off, therefore, the voltage on the direct current bus module is reduced, and the damage of components caused by overlong overvoltage time of the direct current bus module is avoided.
In any of the above technical solutions, preferably, the switching tube is an IGBT.
In the technical scheme, the IGBT (insulated Gate Bipolar transistor) has the characteristics of small driving power and low saturation voltage, so that the IPM module using the IGBT effectively degrades the power consumption of a control system and reduces the heat generation.
In any of the above technical solutions, preferably, the first preset time period is less than or equal to 2ms, and the second preset time period is less than or equal to 20 ms.
In the technical scheme, the first preset time is less than or equal to 2ms, preferably, the first preset time is less than or equal to 1ms, so that the accuracy of judging the power failure condition according to the first preset time is ensured, and meanwhile, the second preset time is preferably 10ms, so that the damage of the direct current bus module caused by overlong overvoltage time due to overlong duration is avoided.
In any of the above technical solutions, preferably, the second preset voltage value is greater than or equal to 1/3 times and less than or equal to 2/3 times the first preset voltage value; the third preset voltage value is greater than or equal to 1.2 times and less than or equal to 1.8 times the first preset voltage value.
In the technical scheme, the second preset voltage value is greater than or equal to 1/3 times of the first preset voltage value and less than or equal to 2/3 times of the first preset voltage value, and the larger the difference between the first preset voltage value and the second preset voltage value is, the larger the voltage drop on the direct current bus module is reflected to be, the higher the possibility of power failure is, preferably, the second preset voltage value is half of the first preset voltage value; the third preset voltage value is set to be 1.2 to 1.8 times of the first preset voltage value, so that the accuracy of judging overvoltage is improved. When the first preset voltage value is the rated voltage value of the direct current bus module, preferably, the third preset voltage value is equal to 1.5 times of the first preset voltage value, so that the direct current bus module is prevented from being damaged directly due to overhigh third preset voltage value.
According to a second aspect of the present invention, there is provided a power down protection control apparatus for a permanent magnet synchronous motor control system including a dc bus module and an IPM module, the dc bus module providing dc power to the IPM module, wherein the power down protection control apparatus includes: the statistical unit is used for carrying out real-time statistics on the voltage value of the direct current bus module; the judging unit is used for judging whether the time length of the voltage value reduced from the first preset voltage value to the second preset voltage value is less than or equal to the first preset time length or not; and the control unit is used for setting all the switch tubes of the IPM module to be in a high-resistance state when the duration is less than or equal to a first preset duration.
The device for controlling power failure protection provided by the invention comprises a statistical unit for carrying out real-time statistics on the voltage value of a direct current bus module, and determining whether the power failure condition occurs or not by monitoring the voltage value of the direct current bus module, specifically, a judging unit for judging whether the time for reducing the voltage value of the direct current bus module from a first preset voltage value to a second preset voltage value is less than or equal to the first preset time, namely the time for reducing the voltage value of the direct current bus module from the first preset voltage value to the second preset voltage value in a very short time is considered to be the power failure condition, and a control unit for setting all switching tubes of an IPM module to be in a high-resistance value state, so that the voltage formed by a counter electromotive force generated by a permanent magnet synchronous motor at the moment in the direct current bus module is lower than the safety voltage, and the situation that the counter electromotive force generated by the permanent magnet synchronous motor forms higher voltage in the direct current bus module, causing damage to the components.
In addition, according to the apparatus for controlling power down protection in the above technical solution provided by the present invention, the following additional technical features may also be provided:
in the above technical solution, preferably, the determining unit is further configured to determine whether a duration that the voltage value is greater than a third preset voltage is greater than a second preset duration; the control unit is also used for controlling the switching tubes corresponding to the lower bridge arm of the IPM module to be switched on and the switching tubes corresponding to the upper bridge arm of the IPM module to be switched off when the duration is longer than a second preset duration until the permanent magnet synchronous motor is stopped; and setting all switch tubes of the IPM module to be in a high-resistance state when the duration is less than or equal to a second preset duration.
In the technical scheme, after all the switch tubes of the IPM module are set to be in a high-resistance state, the voltage value of the direct current bus can be increased under the action of back electromotive force of the permanent magnet synchronous motor, in order to avoid overvoltage of the direct current bus module caused by overhigh voltage value of the direct current bus module, the judging unit judges whether the duration of the voltage value larger than a third preset voltage is larger than a second preset duration, and only when the duration is larger than the second preset duration, the control unit controls the switch tubes corresponding to the lower bridge arm of the IPM module to be switched on and the switch tubes corresponding to the upper bridge arm of the IPM module to be switched off, so that the direct current bus module is separated from the permanent magnet synchronous motor circuit until the permanent magnet synchronous motor stops, and further, the direct current bus module is prevented from being damaged due to overhigh voltage caused by rising of the direct current bus.
In the above technical solution, preferably, the voltage value is measured by a known resistance connected in parallel to the dc bus module.
In the technical scheme, the voltage value of the direct current bus module can be determined by connecting resistors with known resistance values in parallel on the direct current bus, specifically, the voltage of the resistors is directly measured to directly obtain the voltage of the direct current bus module, so that the states of all switch tubes of the IPM module are determined according to the measurement result, the voltage safety of the direct current bus module is ensured, and the device damage caused by the overhigh voltage of the direct current bus module is avoided.
In any of the above technical solutions, preferably, the IPM module is a three-phase bridge circuit composed of six switching tubes.
In the technical scheme, the IPM module provides electric energy for the permanent magnet synchronous motor, and fault detection circuits such as overvoltage, overcurrent and overheat are integrated inside the IPM module, when the power failure condition is judged, the six internal switching tubes are set to be in a high resistance value state, the voltage generated by the counter electromotive force generated by the permanent magnet synchronous motor under the power failure condition on the direct current bus is reduced, the damage of components is avoided, and further, after the switching tube is set to be in a high-resistance state, whether the duration time that the voltage on the direct current bus module exceeds a third preset voltage is longer than a second preset time length or not is detected, when the time is longer than the second preset time, the switch tube corresponding to the lower bridge arm of the IPM module is controlled to be switched on and switched off, therefore, the voltage on the direct current bus module is reduced, and the damage of components caused by overlong overvoltage time of the direct current bus module is avoided.
In any of the above technical solutions, preferably, the switching tube is an IGBT.
In the technical scheme, an IGBT (insulated Gate Bipolar transistor) is an insulated Gate Bipolar transistor. The IGBT has the characteristics of low driving power and low saturation voltage, and therefore, the IPM module using the IGBT effectively degrades the power consumption of the control system, reducing heat generation.
In any of the above technical solutions, preferably, the first preset time period is less than or equal to 2ms, and the second preset time period is less than or equal to 20 ms.
In the technical scheme, the first preset time is less than or equal to 2ms, preferably, the first preset time is less than or equal to 1ms, so that the accuracy of judging the power failure condition according to the first preset time is ensured, and meanwhile, the second preset time is preferably 10ms, so that the damage of the direct current bus module caused by overlong overvoltage time due to overlong duration is avoided.
In any of the above technical solutions, preferably, the second preset voltage value is greater than or equal to 1/3 times and less than or equal to 2/3 times the first preset voltage value; the third preset voltage value is greater than or equal to 1.2 times and less than or equal to 1.8 times the first preset voltage value.
In the technical scheme, the second preset voltage value is greater than or equal to 1/3 times of the first preset voltage value and less than or equal to 2/3 times of the first preset voltage value, and the larger the difference between the first preset voltage value and the second preset voltage value is, the larger the voltage drop on the direct current bus module is reflected to be, the higher the possibility of power failure is, preferably, the second preset voltage value is half of the first preset voltage value; the third preset voltage value is set to be 1.2 to 1.8 times of the first preset voltage value, so that the accuracy of judging overvoltage is improved. When the first preset voltage value is the rated voltage value of the direct current bus module, preferably, the third preset voltage value is equal to 1.5 times of the first preset voltage value, so that the direct current bus module is prevented from being damaged directly due to overhigh third preset voltage value.
According to a third aspect of the present invention, there is provided a permanent magnet synchronous motor control system comprising: the permanent magnet synchronous motor control system comprises an alternating current power supply module, a rectification module, a direct current bus module, an IPM module, a permanent magnet synchronous motor and a micro control module; the alternating current power supply module is used for providing alternating current for the rectifying module; the rectification module rectifies the alternating current and outputs the direct current to the direct current bus module; the IPM module controls the permanent magnet synchronous motor to operate according to the control instruction sent by the micro control module; the micro-control module executes any one of the power failure protection control methods.
In this technical solution, the method for performing any of the above power-down protection control by the micro control module has all the beneficial technical effects of the above power-down protection control method, so that the permanent magnet synchronous motor control system including the micro control module also has all the beneficial technical effects of the above power-down protection control method, and is not described herein again.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a schematic flow diagram of a method of power down protection control of a first embodiment of the invention;
FIG. 2 shows a schematic flow diagram of a method of power down protection control in accordance with another embodiment of the invention;
fig. 3 shows a schematic block diagram of an arrangement for power down protection control according to a first embodiment of the present invention;
FIG. 4 shows a schematic block diagram of an apparatus for power down protection control according to another embodiment of the present invention;
FIG. 5 shows a schematic block diagram of a permanent magnet synchronous motor control system of one embodiment of the present invention;
fig. 6 is a schematic block diagram showing a connection relationship of a permanent magnet synchronous motor control system according to an embodiment of the present invention.
Reference numerals:
wherein, the corresponding relationship between the reference numbers and the names of the components in fig. 6 is:
602 alternating current power supply module, 604 rectifier module, 606 direct current bus module, 608IPM module, 610 permanent magnet synchronous motor, 612 micro control module.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Embodiments of the first aspect of the present invention provide a power failure protection control method for a permanent magnet synchronous motor control system, where the permanent magnet synchronous motor control system includes a dc bus module and an IPM module, and the dc bus module provides dc power for the IPM module.
Fig. 1 shows a schematic flow chart of a method of power down protection control according to a first embodiment of the present invention.
As shown in fig. 1, a method for controlling power down protection according to a first embodiment of the present invention includes:
s102, counting the voltage value of the direct current bus module in real time;
s104, judging whether the time length of the voltage value reduced from the first preset voltage value to the second preset voltage value is less than or equal to a first preset time length;
and S106, setting all switch tubes of the IPM module to be in a high-resistance state when the duration is less than or equal to the first preset duration.
In this embodiment, the voltage value of the dc bus module is counted in real time, and whether a power failure condition occurs is determined by monitoring the voltage value of the dc bus module, specifically, it is determined whether a time period during which the voltage value of the dc bus module is decreased from a first preset voltage value to a second preset voltage value is less than or equal to a first preset time period, that is, the voltage value of the dc bus module is decreased from the first preset voltage value to the second preset voltage value within a short time period, and it is determined that the power failure condition occurs, all switching tubes of the IPM module are set to a high resistance state, so that a voltage formed by a back electromotive force instantaneously generated by the permanent magnet synchronous motor at the dc bus module is lower than a safe voltage, and damage to components due to a higher voltage formed by the back electromotive force generated by the permanent magnet synchronous motor at the dc bus module due to the power failure is avoided.
Fig. 2 shows a schematic flow diagram of a method of power down protection control according to another embodiment of the present invention.
As shown in fig. 2, the method for controlling power down protection according to the first embodiment of the present invention includes:
s202, counting the voltage value of the direct current bus module in real time;
s204, judging whether the time length of the voltage value reduced from the first preset voltage value to the second preset voltage value is less than or equal to a first preset time length;
s206, when the duration is less than or equal to a first preset duration, setting all switch tubes of the IPM module to be in a high-resistance state;
s208, judging whether the duration of the voltage value greater than the third preset voltage is greater than a second preset duration;
s210, when the duration is longer than a second preset duration, controlling the switching tubes corresponding to the lower bridge arm of the IPM module to be switched on and the switching tubes corresponding to the upper bridge arm of the IPM module to be switched off until the permanent magnet synchronous motor is stopped, otherwise, setting all the switching tubes of the IPM module to be in a high-resistance state.
In this embodiment, after all the switching tubes of the IPM module are set to the high resistance state, the voltage value of the dc bus is increased under the action of the back electromotive force of the permanent magnet synchronous motor, to avoid an overvoltage condition of the dc bus module caused by an excessively high voltage value of the dc bus module, whether the duration of the voltage value greater than the third preset voltage is greater than the second preset duration is determined, and only when the duration is greater than the second preset duration, the switching tubes corresponding to the lower bridge arm of the IPM module are controlled to be turned on and the switching tubes corresponding to the upper bridge arm of the IPM module are controlled to be turned off, so that the dc bus module is separated from the circuit of the permanent magnet synchronous motor until the permanent magnet synchronous motor stops, and further, the dc bus module is prevented from being damaged due to an excessively high voltage caused by an increase in the voltage of the dc bus.
In one embodiment of the invention, the voltage value is measured by a known resistance connected in parallel to the dc bus module.
In this embodiment, the voltage value of the dc bus module may be determined by connecting a resistor with a known resistance in parallel to the dc bus, specifically, the voltage of the resistor is directly measured to directly obtain the voltage of the dc bus module, so as to determine the states of all switching tubes of the IPM module according to the measurement result, ensure the voltage safety of the dc bus module, and avoid the device damage caused by the overhigh voltage of the dc bus module.
In one embodiment of the present invention, the IPM module is a three-phase bridge circuit composed of six switching tubes.
In the embodiment, the IPM module provides power for the permanent magnet synchronous motor, and fault detection circuits such as overvoltage, overcurrent and overheat are integrated inside the IPM module, when the power failure condition is judged, the six internal switching tubes are set to be in a high resistance value state, the voltage generated by the counter electromotive force generated by the permanent magnet synchronous motor under the power failure condition on the direct current bus is reduced, the damage of components is avoided, and further, after the switching tube is set to be in a high-resistance state, whether the duration time that the voltage on the direct current bus module exceeds a third preset voltage is longer than a second preset time length or not is detected, when the time is longer than the second preset time, the switch tube corresponding to the lower bridge arm of the IPM module is controlled to be switched on and switched off, therefore, the voltage on the direct current bus module is reduced, and the damage of components caused by overlong overvoltage time of the direct current bus module is avoided.
In one embodiment of the invention, the switching tube is an IGBT.
In this embodiment, an IGBT (insulated Gate Bipolar transistor) has the characteristics of low driving power and low saturation voltage, and therefore, an IPM module using the IGBT effectively degrades power consumption of a control system and reduces heat generation.
In one embodiment of the present invention, the first preset time period is less than or equal to 2ms, and the second preset time period is less than or equal to 20 ms.
In this embodiment, the first preset duration is less than or equal to 2ms, and preferably, the first preset duration is less than or equal to 1ms, so as to ensure the accuracy of determining the power failure condition according to the first preset duration, and meanwhile, the second preset duration is preferably 10ms, so as to avoid the damage of the dc bus module due to the overlong overvoltage time caused by the overlong duration.
In one embodiment of the present invention, the second predetermined voltage value is greater than or equal to 1/3 times and less than or equal to 2/3 times the first predetermined voltage value; the third preset voltage value is greater than or equal to 1.2 times and less than or equal to 1.8 times the first preset voltage value.
In this embodiment, the second preset voltage value is greater than or equal to 1/3 times the first preset voltage value and less than or equal to 2/3 times the first preset voltage value, and the larger the difference between the first preset voltage value and the second preset voltage value is, the larger the voltage drop on the dc bus module is reflected to be, that is, the higher the possibility of power failure is, preferably, the second preset voltage value is half of the first preset voltage value; the third preset voltage value is set to be 1.2 to 1.8 times of the first preset voltage value, so that the accuracy of judging overvoltage is improved. When the first preset voltage value is the rated voltage value of the direct current bus module, preferably, the third preset voltage value is equal to 1.5 times of the first preset voltage value, so that the direct current bus module is prevented from being damaged directly due to overhigh third preset voltage value.
The embodiment of the second aspect of the invention provides a power failure protection control device, which is used for a permanent magnet synchronous motor control system and comprises a direct current bus module and an IPM module, wherein the direct current bus module provides direct current for the IPM module.
Fig. 3 shows a schematic block diagram of an apparatus 300 for power down protection control according to a first embodiment of the present invention.
As shown in fig. 3, the apparatus 300 for controlling power down protection according to the first embodiment of the present invention includes: the statistical unit 302 is used for performing real-time statistics on the voltage value of the direct current bus module; a determining unit 304, configured to determine whether a duration of the voltage value decreasing from the first preset voltage value to the second preset voltage value is less than or equal to a first preset duration; and the control unit 306 is configured to set all the switching tubes of the IPM module to a high-resistance state when the duration is less than or equal to a first preset duration.
The device for controlling power-down protection provided by the invention comprises a statistical unit 302 for real-time statistics of the voltage value of a direct current bus module, and for determining whether a power-down situation occurs by monitoring the voltage value of the direct current bus module, specifically, a judging unit 304 for judging whether the time length for reducing the voltage value of the direct current bus module from a first preset voltage value to a second preset voltage value is less than or equal to a first preset time length, namely the time length for reducing the voltage value of the direct current bus module from the first preset voltage value to the second preset voltage value in a very short time is less than or equal to the first preset time length, and considering that the power-down situation occurs, a control unit 306 for setting all switching tubes of an IPM module to be in a high-resistance state, so that the voltage formed by a counter electromotive force generated by a permanent magnet synchronous motor at the moment is lower than a safe voltage, and the situation that the counter electromotive force generated by the permanent magnet synchronous motor forms a, causing damage to the components.
Fig. 4 shows a schematic block diagram of an apparatus 400 for power down protection control according to another embodiment of the present invention.
As shown in fig. 4, the apparatus 400 for controlling power down protection according to the first embodiment of the present invention includes: a counting unit 402, configured to count a voltage value of the dc bus module in real time; a determining unit 404, configured to determine whether a duration of the voltage value decreasing from the first preset voltage value to the second preset voltage value is less than or equal to a first preset duration; the control unit 406 is configured to set all switching tubes of the IPM module to a high resistance state when the duration is less than or equal to a first preset duration; the determining unit 404 is further configured to determine whether a duration of the voltage value being greater than a third preset voltage is greater than a second preset duration; the control unit 406 is further configured to control the switching tubes corresponding to the lower arm of the IPM module to be turned on and the switching tubes corresponding to the upper arm of the IPM module to be turned off when the duration is longer than a second preset duration until the permanent magnet synchronous motor is stopped; and setting all switch tubes of the IPM module to be in a high-resistance state when the duration is less than or equal to a second preset duration.
In this embodiment, after all the switching tubes of the IPM module are set to the high resistance state, the voltage value of the dc bus is increased under the action of the back electromotive force of the permanent magnet synchronous motor, to avoid an overvoltage condition of the dc bus module caused by an excessively high voltage value of the dc bus module, the determining unit 404 determines whether the duration of the voltage value greater than the third preset voltage is greater than the second preset duration, and only when the duration is greater than the second preset duration, the control unit 406 controls the switching tubes corresponding to the lower arm of the IPM module to be turned on and the switching tubes corresponding to the upper arm of the IPM module to be turned off, so as to separate the dc bus module from the circuit of the permanent magnet synchronous motor until the permanent magnet synchronous motor stops, and further prevent the dc bus module from being damaged due to an excessively high voltage caused by the increased voltage value of the dc bus.
In one embodiment of the invention, the voltage value is measured by a known resistance connected in parallel to the dc bus module.
In this embodiment, the voltage value of the dc bus module may be determined by connecting a resistor with a known resistance in parallel to the dc bus, specifically, the voltage of the resistor is directly measured to directly obtain the voltage of the dc bus module, so as to determine the states of all switching tubes of the IPM module according to the measurement result, ensure the voltage safety of the dc bus module, and avoid the device damage caused by the overhigh voltage of the dc bus module.
In one embodiment of the present invention, the IPM module is a three-phase bridge circuit composed of six switching tubes.
In the embodiment, the IPM module provides power for the permanent magnet synchronous motor, and fault detection circuits such as overvoltage, overcurrent and overheat are integrated inside the IPM module, when the power failure condition is judged, the six internal switching tubes are set to be in a high resistance value state, the voltage generated by the counter electromotive force generated by the permanent magnet synchronous motor under the power failure condition on the direct current bus is reduced, the damage of components is avoided, and further, after the switching tube is set to be in a high-resistance state, whether the duration time that the voltage on the direct current bus module exceeds a third preset voltage is longer than a second preset time length or not is detected, when the time is longer than the second preset time, the switch tube corresponding to the lower bridge arm of the IPM module is controlled to be switched on and switched off, therefore, the voltage on the direct current bus module is reduced, and the damage of components caused by overlong overvoltage time of the direct current bus module is avoided.
In one embodiment of the invention, the switching tube is an IGBT.
In this embodiment, an igbt (insulated Gate Bipolar transistor) is used. The IGBT has the characteristics of low driving power and low saturation voltage, and therefore, the IPM module using the IGBT effectively degrades the power consumption of the control system, reducing heat generation.
In one embodiment of the present invention, the first preset time period is less than or equal to 2ms, and the second preset time period is less than or equal to 20 ms.
In this embodiment, the first preset duration is less than or equal to 2ms, and preferably, the first preset duration is less than or equal to 1ms, so as to ensure the accuracy of determining the power failure condition according to the first preset duration, and meanwhile, the second preset duration is preferably 10ms, so as to avoid the damage of the dc bus module due to the overlong overvoltage time caused by the overlong duration.
In one embodiment of the present invention, the second predetermined voltage value is greater than or equal to 1/3 times and less than or equal to 2/3 times the first predetermined voltage value; the third preset voltage value is greater than or equal to 1.2 times and less than or equal to 1.8 times the first preset voltage value.
In this embodiment, the second preset voltage value is greater than or equal to 1/3 times the first preset voltage value and less than or equal to 2/3 times the first preset voltage value, and the larger the difference between the first preset voltage value and the second preset voltage value is, the larger the voltage drop on the dc bus module is reflected to be, that is, the higher the possibility of power failure is, preferably, the second preset voltage value is half of the first preset voltage value; the third preset voltage value is set to be 1.2 to 1.8 times of the first preset voltage value, so that the accuracy of judging overvoltage is improved. When the first preset voltage value is the rated voltage value of the direct current bus module, preferably, the third preset voltage value is equal to 1.5 times of the first preset voltage value, so that the direct current bus module is prevented from being damaged directly due to overhigh third preset voltage value.
In embodiments of the third aspect of the present invention, a permanent magnet synchronous motor control system is provided, and fig. 5 shows a schematic block diagram of a permanent magnet synchronous motor control system 500 of an embodiment of the present invention.
As shown in fig. 5, the permanent magnet synchronous motor control system 500 includes: the system comprises an alternating current power supply module 502, a rectifier module 504, a direct current bus module 506, an IPM module 508, a permanent magnet synchronous motor 510 and a micro-control module 512; the ac power module 502 is used for providing ac power for the rectifier module 504; the rectifying module 504 rectifies the ac power and outputs the dc power to the dc bus module 506; the IPM module 508 controls the operation of the permanent magnet synchronous motor 510 according to the control command sent by the micro control module 512; the micro control module 512 performs any of the above methods of power down protection control.
In this embodiment, the micro control module 512 executes any one of the power-down protection control methods described above, which has all the beneficial technical effects of the power-down protection control method described above, so that the permanent magnet synchronous motor control system 500 including the micro control module 512 also has all the beneficial technical effects of the power-down protection control method described above, and details are not described herein again.
The technical scheme of the invention is described in detail by combining the attached drawings, and the invention provides a power failure protection control method.
Fig. 6 is a schematic block diagram illustrating a connection relationship of a permanent magnet synchronous motor control system 600 according to an embodiment of the present invention. This application is through monitoring the voltage on the direct current bus module 606, when the judgement appears falling the electricity, set the switch tube in the IPM module 608 for the high resistance value state, thereby make the voltage on the direct current bus module reduce, thereby avoid appearing above-mentioned circumstances, because PMSM 610 can not the stall in the twinkling of an eye, can rotate continuously in a period, back electromotive force can be continued to be used in direct current bus module 606, through judging whether the duration that the voltage value is greater than the third and predetermines the duration of voltage is greater than the second, confirm whether adjust the state of switch tube in the IPM module 608, and then guarantee the safety of direct current bus module 606. The rectifying module 604 includes at least a diode for rectifying the ac power module 602, and a capacitor is connected in parallel to the two ends of the dc bus module 606.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A power-down protection control method is used for a permanent magnet synchronous motor control system, and is characterized in that the permanent magnet synchronous motor control system comprises a direct current bus module and an IPM module, the direct current bus module provides direct current for the IPM module, and the power-down protection control method comprises the following steps:
counting the voltage value of the direct current bus module in real time;
judging whether the time length of the voltage value reduced from a first preset voltage value to a second preset voltage value is less than or equal to a first preset time length;
when the duration is less than or equal to the first preset duration, setting all switch tubes of the IPM module to be in a high-resistance state;
after all the switching tubes of the IPM module are set to the high resistance state, the method further includes:
judging whether the duration of the voltage value larger than a third preset voltage is larger than a second preset duration or not;
when the duration is longer than the second preset duration, controlling the switch tube corresponding to the lower bridge arm of the IPM module to be switched on and the switch tube corresponding to the upper bridge arm of the IPM module to be switched off until the permanent magnet synchronous motor is stopped; otherwise, setting all switch tubes of the IPM module to be in a high-resistance state.
2. The method of power fail protection control of claim 1,
the voltage value is measured by a known resistor connected in parallel to the direct current bus module.
3. The method of power fail protection control of claim 2,
the IPM module is a three-phase bridge circuit formed by six switching tubes.
4. The method of power fail protection control of claim 3,
the switch tube is an IGBT.
5. The method for power down protection control according to claim 2, wherein the first preset duration is less than or equal to 2ms, and the second preset duration is less than or equal to 20 ms.
6. The method of power fail protection control of claim 2,
the second preset voltage value is greater than or equal to 1/3 times and less than or equal to 2/3 times of the first preset voltage value; the third preset voltage value is greater than or equal to 1.2 times and less than or equal to 1.8 times of the first preset voltage value.
7. The utility model provides a power-fail safeguard control's device for PMSM control system, its characterized in that, PMSM control system includes direct current bus module and IPM module, direct current bus module does the IPM module provides the direct current, power-fail safeguard control's device includes:
the statistical unit is used for carrying out real-time statistics on the voltage value of the direct current bus module;
the judging unit is used for judging whether the time length of the voltage value reduced from the first preset voltage value to the second preset voltage value is less than or equal to the first preset time length or not;
the control unit is used for setting all switch tubes of the IPM module to be in a high-resistance state when the duration is less than or equal to the first preset duration;
the judging unit is further used for judging whether the duration of the voltage value larger than a third preset voltage is larger than a second preset duration;
the control unit is further used for controlling the switching tubes corresponding to the lower bridge arm of the IPM module to be switched on and the switching tubes corresponding to the upper bridge arm of the IPM module to be switched off when the duration is longer than the second preset duration until the permanent magnet synchronous motor is stopped; and setting all switch tubes of the IPM module to be in a high-resistance state when the duration is less than or equal to the second preset duration.
8. A permanent magnet synchronous motor control system, comprising:
the system comprises an alternating current power supply module, a rectifier module, a direct current bus module, an IPM module, a permanent magnet synchronous motor and a micro control module;
the alternating current power supply module is used for providing alternating current for the rectifying module;
the rectification module rectifies the alternating current and outputs direct current to the direct current bus module;
the IPM module controls the permanent magnet synchronous motor to operate according to the control instruction sent by the micro-control module;
the micro control module performs the method of power down protection control of any one of claims 1 to 6.
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| CN201810527882.5A CN108649550B (en) | 2018-05-29 | 2018-05-29 | Power-down protection control method and device and permanent magnet synchronous motor control system |
| PCT/CN2018/116878 WO2019227873A1 (en) | 2018-05-29 | 2018-11-22 | Power failure protection control method and device, and permanent magnet synchronous motor control system |
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| CN201810527882.5A CN108649550B (en) | 2018-05-29 | 2018-05-29 | Power-down protection control method and device and permanent magnet synchronous motor control system |
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| CN108649550B (en) * | 2018-05-29 | 2020-07-31 | 美的威灵电机技术（上海）有限公司 | Power-down protection control method and device and permanent magnet synchronous motor control system |
| CN110567094B (en) * | 2019-09-17 | 2021-06-18 | 宁波奥克斯电气股份有限公司 | Control method and device for power-off protection of air conditioner system and air conditioner |
| CN110904615B (en) * | 2019-12-02 | 2022-04-05 | 江苏新安电器股份有限公司 | Brushless direct current motor control method and system for washing machine |
| CN113346458B (en) * | 2020-03-02 | 2023-03-21 | 广东威灵电机制造有限公司 | Motor control method, motor control device, motor system, and storage medium |
| CN113346804B (en) * | 2020-03-02 | 2023-06-13 | 广东威灵电机制造有限公司 | Motor control method, motor control device, motor system, and storage medium |
| CN112428823B (en) * | 2020-11-26 | 2022-03-15 | 东风商用车有限公司 | Method and system for restraining back electromotive force of permanent magnet synchronous motor of electric vehicle |
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| JP4203993B2 (en) * | 2003-08-01 | 2009-01-07 | 株式会社日立製作所 | Power system analysis support method |
| WO2008061566A1 (en) * | 2006-11-23 | 2008-05-29 | Tte Germany Gmbh | Power failure detection circuit |
| WO2010150339A1 (en) * | 2009-06-22 | 2010-12-29 | 三菱電機株式会社 | Motor drive apparatus |
| CN102983796A (en) * | 2012-08-06 | 2013-03-20 | 联合汽车电子有限公司 | Permanent magnet synchronous motor anti-demagnetization control method |
| CN102957366B (en) * | 2012-09-18 | 2015-05-20 | 青岛海信日立空调系统有限公司 | Permanent magnet synchronous motor control method and device and air conditioning equipment |
| CN105141214B (en) * | 2015-09-01 | 2018-09-11 | 重庆长安汽车股份有限公司 | A kind of processing method of electric machine controller to busbar voltage failure |
| CN105514941A (en) * | 2015-12-31 | 2016-04-20 | 联合汽车电子有限公司 | Electric vehicle inverter protective device and method |
| CN106655908B (en) * | 2016-09-09 | 2019-06-04 | 珠海格力电器股份有限公司 | Motor control method and system |
| CN107843807B (en) * | 2016-09-20 | 2021-07-30 | 丰郅(上海)新能源科技有限公司 | Monitoring system capable of timely turning off power grid at voltage drop moment |
| CN106549614B (en) * | 2016-12-12 | 2019-01-22 | 科诺伟业风能设备（北京）有限公司 | A kind of wind generating set pitch control is away from system power network fluctuation guard method |
| CN106788107B (en) * | 2017-01-22 | 2020-09-18 | 中山大洋电机股份有限公司 | Automobile motor controller |
| CN107528311A (en) * | 2017-10-20 | 2017-12-29 | 陕西航空电气有限责任公司 | A kind of circuit for improving reliability in HVDC brushless motor controller power process |
| CN117081460A (en) * | 2017-12-28 | 2023-11-17 | 杭州先途电子有限公司 | Variable frequency controller and control method thereof |
| CN108649550B (en) * | 2018-05-29 | 2020-07-31 | 美的威灵电机技术（上海）有限公司 | Power-down protection control method and device and permanent magnet synchronous motor control system |
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