CN110932649B - Power-down protection control method and control module - Google Patents
Power-down protection control method and control module Download PDFInfo
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- CN110932649B CN110932649B CN201811092858.XA CN201811092858A CN110932649B CN 110932649 B CN110932649 B CN 110932649B CN 201811092858 A CN201811092858 A CN 201811092858A CN 110932649 B CN110932649 B CN 110932649B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/028—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault
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- Control Of Ac Motors In General (AREA)
Abstract
The invention provides a power failure protection control method for a permanent magnet synchronous motor control system, a control module, a computer readable storage medium 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 power is lost or not according to the voltage value; and when power failure is judged, entering a constant voltage braking mode to control the permanent magnet synchronous motor to decelerate and brake according to a preset acceleration so as to enable the voltage value to be smaller than or equal to a first preset voltage value. According to the power failure protection control method provided by the invention, the permanent magnet synchronous motor is controlled to decelerate and brake according to the preset acceleration through constant-voltage braking, so that the deceleration speed of the permanent magnet synchronous motor can be relieved, the voltage formed by the counter electromotive force instantaneously generated by the permanent magnet synchronous motor in the direct current bus module is lower than the safe voltage, and the damage of components caused by the fact that the counter electromotive force generated by the permanent magnet synchronous motor forms higher voltage in the direct current bus module due to power failure is avoided.
Description
Technical Field
The invention relates to the field of motor control, in particular to a power failure protection control method for a permanent magnet synchronous motor control system, a control module, a computer readable storage medium and a permanent magnet synchronous motor control system.
Background
Under the high-speed operation of permanent magnet synchronous motor and entering weak magnetic state, if the Power failure of alternating current Power supply side appears, permanent magnet synchronous motor can produce great back electromotive force to directly charge the direct current bus Module that is used for supplying Power through IPM Module (Intelligent Power Module, is the core part that controls permanent magnet synchronous motor operation), probably cause direct current bus Module overvoltage to damage.
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 power down protection control method.
A second aspect of the present invention is to provide a control module.
A third aspect of the present invention is to provide a computer-readable storage medium.
A fourth aspect of the present invention is to provide a permanent magnet synchronous motor control system.
In view of this, according to a first aspect of the present invention, there is provided a power-down 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, the dc bus module provides dc power for the IPM module, and the power-down protection control method includes: counting the voltage value of the direct current bus module in real time; judging whether power is lost or not according to the voltage value; and when power failure is judged, entering a constant voltage braking mode to control the permanent magnet synchronous motor to decelerate and brake according to a preset acceleration so as to enable the voltage value to be smaller than or equal to a first preset voltage value.
The invention provides a power failure protection control method, which counts the voltage value of a direct current bus module in real time, determines whether the power failure condition occurs or not by monitoring the voltage value of the direct current bus module, and when the power failure is determined, if no interference is added, a permanent magnet synchronous motor can quickly decelerate and generate larger back electromotive force to damage the direct current bus module, the invention controls the permanent magnet synchronous motor to decelerate and brake according to preset acceleration through constant voltage brake, can relieve the deceleration speed of the permanent magnet synchronous motor, so as to control the voltage value of the direct current bus module not to exceed a first preset voltage value until the permanent magnet synchronous motor stops (the voltage value of the direct current bus module is 0 when the permanent magnet synchronous motor stops), and sets a reasonable first preset voltage value, so that the back electromotive force generated instantly by the permanent magnet synchronous motor is lower than the safe voltage at the direct current bus module, and the situation that the back electromotive force generated by the permanent magnet synchronous motor forms higher voltage at the direct current bus module due to the power failure is avoided, causing damage to the components. Specifically, the preset acceleration is a variable name and does not represent that the permanent magnet synchronous motor is controlled to decelerate at a fixed acceleration value in the constant-voltage braking mode, but the voltage value of the direct-current bus module is always smaller than or equal to a first preset voltage value by adjusting the size of the preset acceleration as required.
In addition, according to the power failure protection control method 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 step of determining whether to power down according to the voltage value includes: judging whether the voltage reduction time length of the voltage value reduced from the second preset voltage value to the third preset voltage value is less than or equal to the first preset time length; and when the voltage reduction duration is less than or equal to a first preset duration, judging power failure.
In the technical scheme, how to judge whether the permanent magnet synchronous motor is powered down or not according to the voltage value of the direct current bus module is specifically limited. When the voltage value of the direct current bus module is monitored, the time length of the voltage value from the second preset voltage value to the third preset voltage value is used as the voltage reduction time length, whether the voltage reduction time length is less than or equal to the first preset time length or not is judged, namely whether the voltage value of the direct current bus module is reduced from the second preset voltage value to the third preset voltage value within a short time or not is judged, if yes, the power failure condition is considered to occur, and the power failure condition is monitored simply and reliably.
In any of the above technical solutions, preferably, the third preset voltage value is greater than or equal to 1/3 times the second preset voltage value and less than or equal to 2/3 times the second preset voltage value.
In the technical scheme, the magnitude relation between the second preset voltage value and the third preset voltage value is specifically defined. And enabling the third preset voltage value to be greater than or equal to 1/3 times of the second preset voltage value and less than or equal to 2/3 times of the second preset voltage value, wherein the larger the difference between the second preset voltage value and the third preset voltage value is, the larger the voltage drop on the direct-current bus module is reflected, and the higher the possibility of power failure occurs.
In any of the above technical solutions, preferably, the first preset voltage value is greater than or equal to the second preset voltage value and is less than the safety voltage of the dc bus module.
In the technical scheme, the value range of the first preset voltage value is specifically limited. On one hand, the first preset voltage value is required to be larger than or equal to the second preset voltage value so as to ensure that the voltage of the direct current bus module is not too low, and on the other hand, the first preset voltage value is required to be smaller than or equal to the safe voltage of the direct current bus module, preferably smaller than the safe voltage, so that the use safety of the direct current bus module is ensured.
In any of the above technical solutions, preferably, the step of entering a constant voltage braking mode to control the permanent magnet synchronous motor to perform deceleration braking according to a preset acceleration so as to enable the voltage value to be less than or equal to a first preset voltage value includes: and entering a constant voltage braking mode to control the permanent magnet synchronous motor to decelerate and brake according to a preset acceleration so as to enable the voltage value to be less than or equal to a first preset voltage value and greater than or equal to a second preset voltage value.
In the technical scheme, after the permanent magnet synchronous motor enters the constant voltage braking mode, the voltage value of the direct current bus module is controlled to be smaller than or equal to a first preset voltage value so as to avoid overvoltage damage, and the voltage value of the direct current bus module is controlled to be larger than or equal to a second preset voltage value so as to avoid the situation that the permanent magnet synchronous motor cannot be controlled to operate when the voltage of the direct current bus module is too low.
In any one of the above technical solutions, preferably, the step of performing real-time statistics on the voltage value of the dc bus module includes: and detecting the voltage value of the known resistor connected in parallel on the direct current bus module in real time.
In the technical scheme, the voltage value of the direct current bus module can be determined by connecting a resistor with known resistance in parallel on the direct current bus module, specifically, the voltage value of the known resistor is directly measured, the voltage of the direct current bus module can be obtained, the voltage value of the direct current bus module inconvenient to measure is converted into the voltage value of the resistor convenient to measure, the improvement on the hardware structure is small, the measurement is simple and accurate, the operation of the permanent magnet synchronous motor is controlled according to the measurement result, the voltage safety of the direct current bus module is ensured, and the phenomenon that the device is damaged due to the overhigh voltage of the direct current bus module is avoided.
In any of the above technical solutions, preferably, after the step of determining whether to power down according to the voltage value, before entering a constant voltage braking mode to control the permanent magnet synchronous motor to perform deceleration braking according to a preset acceleration so as to enable the voltage value to be less than or equal to a first preset voltage value, the method further includes: when power failure is judged, timing is started to obtain a deceleration duration; after entering the constant voltage braking mode to control the permanent magnet synchronous motor to perform deceleration braking according to the preset acceleration so as to enable the voltage value to be less than or equal to the first preset voltage value, the method further comprises the following steps: and when the deceleration duration is greater than or equal to a second preset duration, if the motor is not stopped, exiting the constant-pressure braking mode and entering a normal operation mode.
According to the technical scheme, the speed reduction duration is obtained by starting timing from the time of power failure judgment, meanwhile, the permanent magnet synchronous motor is controlled to gradually reduce to stop in a constant-pressure braking mode, if the alternating current power supply side has power failure for a long time, the permanent magnet synchronous motor is stopped finally after a period of time, through reasonably setting a second preset duration, when the speed reduction duration is larger than or equal to the second preset duration, the permanent magnet synchronous motor is in a stopped state, at the moment, if the permanent magnet synchronous motor is detected not to be stopped, the situation that only short-time power failure occurs on the alternating current power supply side is detected, the permanent magnet synchronous motor exits the constant-pressure braking mode and enters a normal operation mode, and the permanent magnet synchronous motor can continue to operate.
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 1 s.
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. The second preset time is less than or equal to 1s, preferably, the second preset time is less than or equal to 500ms, so that the constant-voltage braking mode can be exited and the normal operation mode can be entered if the motor is not stopped when the alternating-current power supply side is only powered off instantaneously.
According to a second aspect of the present invention, there is provided a control module for a permanent magnet synchronous motor control system, comprising: a memory configured to store executable instructions; the processor is configured to execute the stored instructions to implement the steps of the method according to any of the above technical solutions, so that the processor has all technical effects of the power failure protection control method, and details are not described herein.
According to a third aspect of the present invention, there is provided a computer-readable storage medium, on which a computer program is stored, where the computer program, when being executed by a processor, implements the steps of the method according to any of the above technical solutions, so as to have all the technical effects of the power-down protection control method, and details are not repeated herein.
According to a fourth aspect of the present invention, there is provided a permanent magnet synchronous motor control system, including the control module according to the above technical solution, so as to have all technical effects of the control module, which will not be described herein again.
In the above technical solution, preferably, the permanent magnet synchronous motor control system further includes: the intelligent power supply comprises an alternating current power supply module, a rectifier module, a direct current bus module and an IPM module; the alternating current power supply module provides 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 direct current bus module provides filtered direct current for the IPM module; and the IPM module controls the permanent magnet synchronous motor to operate according to the control instruction sent by the control module.
In the technical scheme, other functional modules in the permanent magnet synchronous motor control system are specifically limited. The alternating current power supply module is used for providing alternating current for the rectifying module; the input end of the rectification module is connected with the alternating current power supply module and rectifies alternating current to obtain direct current; the input end of the direct current bus module is connected with the output end of the rectification module, and the direct current is filtered to obtain filtered direct current; the power input end of the IPM module is connected with the output end of the direct current bus module, the direct current bus module provides filtered direct current, and the power output end of the IPM module is connected with the permanent magnet synchronous motor so as to drive the permanent magnet synchronous motor to rotate or stop; the control module is connected with the IPM module and sends a control instruction to the IPM module so as to directly control the operation of the permanent magnet synchronous motor by the IPM module. Therefore, the permanent magnet synchronous motor control system has a power failure protection function.
In any of the above technical solutions, preferably, the IPM module is a three-phase bridge circuit composed of six switching tubes, and the switching tubes are Insulated Gate Bipolar Transistors (IGBTs).
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 in the IPM module, when the power failure condition is judged, the permanent magnet synchronous motor can be controlled to enter a power generation state until the permanent magnet synchronous motor stops by determining the states of all switch tubes of the IPM module, the voltage generated by the counter electromotive force generated by the permanent magnet synchronous motor under the power failure condition at the direct current bus module is reduced, and therefore damage of components is avoided. The switch tube is an IGBT and has the characteristics of small driving power and low saturation voltage, so that the IPM module using the IGBT can effectively degrade the electric energy consumption of the control system and reduce the heat generation.
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 power down protection control method of one embodiment of the present invention;
FIG. 2 shows a schematic flow diagram of a power down protection control method of another embodiment of the present invention;
FIG. 3 shows a schematic flow diagram of a power down protection control method of yet another embodiment of the present invention;
FIG. 4 shows a schematic block diagram of a control module of one embodiment of the present invention;
fig. 5 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.
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.
The embodiment of the first aspect of the invention provides a power-down protection control method for a permanent magnet synchronous motor control system, wherein the permanent magnet synchronous motor control system comprises a direct current bus module and an IPM module, and the direct current bus module provides direct current for the IPM module.
Fig. 1 shows a schematic flow chart of a power down protection control method according to an embodiment of the present invention.
As shown in fig. 1, a power down protection control method according to an embodiment of the present invention includes:
s102, counting the voltage value of the direct current bus module in real time;
s104, judging whether power is off or not according to the voltage value;
and S106, when power failure is judged, entering a constant voltage braking mode to control the permanent magnet synchronous motor to decelerate and brake according to a preset acceleration so as to enable the voltage value to be smaller than or equal to a first preset voltage value.
The invention provides a power failure protection control method, which counts the voltage value of a direct current bus module in real time, determines whether the power failure condition occurs or not by monitoring the voltage value of the direct current bus module, and when the power failure is determined, if no interference is added, a permanent magnet synchronous motor can quickly decelerate and generate larger back electromotive force to damage the direct current bus module, the invention controls the permanent magnet synchronous motor to decelerate and brake according to preset acceleration through constant voltage brake, can relieve the deceleration speed of the permanent magnet synchronous motor, so as to control the voltage value of the direct current bus module not to exceed a first preset voltage value until the permanent magnet synchronous motor stops (the voltage value of the direct current bus module is 0 when the permanent magnet synchronous motor stops), and sets a reasonable first preset voltage value, so that the back electromotive force generated instantly by the permanent magnet synchronous motor is lower than the safe voltage at the direct current bus module, and the situation that the back electromotive force generated by the permanent magnet synchronous motor forms higher voltage at the direct current bus module due to the power failure is avoided, causing damage to the components. Specifically, the preset acceleration is a variable name and does not represent that the permanent magnet synchronous motor is controlled to decelerate at a fixed acceleration value in the constant-voltage braking mode, but the voltage value of the direct-current bus module is always smaller than or equal to a first preset voltage value by adjusting the size of the preset acceleration as required.
Furthermore, the permanent magnet synchronous motor is controlled to enter a power generation state through braking, and the voltage formed by the direct current bus module can be ensured to be lower than the safe voltage through controlling the power generation amount.
Fig. 2 shows a schematic flow chart of a power down protection control method according to another embodiment of the present invention.
As shown in fig. 2, a power down protection control method according to another embodiment of the present invention includes:
s202, counting the voltage value of the direct current bus module in real time;
s204, judging whether the voltage reduction time length of the voltage value reduced from the second preset voltage value to the third preset voltage value is less than or equal to the first preset time length, if so, turning to S206, and if not, returning to S204;
and S206, entering a constant-voltage braking mode to control the permanent magnet synchronous motor to decelerate and brake according to a preset acceleration so as to enable the voltage value to be smaller than or equal to a first preset voltage value.
In this embodiment, how to determine whether the permanent magnet synchronous motor is powered down according to the voltage value of the dc bus module is specifically defined. When the voltage value of the direct current bus module is monitored, the time length of the voltage value from the second preset voltage value to the third preset voltage value is used as the voltage reduction time length, whether the voltage reduction time length is less than or equal to the first preset time length or not is judged, namely whether the voltage value of the direct current bus module is reduced from the second preset voltage value to the third preset voltage value within a short time or not is judged, if yes, the power failure condition is considered to occur, and the power failure condition is monitored simply and reliably.
In an embodiment of the present invention, preferably, the third predetermined voltage value is greater than or equal to 1/3 times the second predetermined voltage value and less than or equal to 2/3 times the second predetermined voltage value.
In this embodiment, the magnitude relationship between the second preset voltage value and the third preset voltage value is specifically defined. And if the third preset voltage value is greater than or equal to 1/3 times the second preset voltage value and less than or equal to 2/3 times the second preset voltage value, the larger the difference between the second preset voltage value and the third preset voltage value is, the larger the voltage drop on the direct current bus module is reflected to be, that is, the higher the possibility of power failure is, and preferably, the third preset voltage value is half of the second preset voltage value. In other words, the second preset voltage value and the third preset voltage value only need to satisfy the above relative magnitude relation, and specific values thereof do not need to be limited, so that the power failure condition is always monitored in the voltage value change process of the direct current bus module.
In an embodiment of the present invention, preferably, the first preset voltage value is greater than or equal to the second preset voltage value and is less than the safety voltage of the dc bus module.
In this embodiment, a value range of the first preset voltage value is specifically defined. On one hand, the first preset voltage value is required to be larger than or equal to the second preset voltage value so as to ensure that the voltage of the direct current bus module is not too low, and on the other hand, the first preset voltage value is required to be smaller than or equal to the safe voltage of the direct current bus module, preferably smaller than the safe voltage, so that the use safety of the direct current bus module is ensured.
In an embodiment of the present invention, preferably, the step of entering the constant voltage braking mode to control the permanent magnet synchronous motor to perform deceleration braking at the preset acceleration so that the voltage value is less than or equal to the first preset voltage value includes: and entering a constant voltage braking mode to control the permanent magnet synchronous motor to decelerate and brake according to a preset acceleration so as to enable the voltage value to be less than or equal to a first preset voltage value and greater than or equal to a second preset voltage value.
In this embodiment, after entering the constant voltage braking mode, the voltage value of the dc bus module is not only controlled to be less than or equal to the first preset voltage value to avoid overvoltage damage, but also controlled to be greater than or equal to the second preset voltage value to avoid that the operation of the permanent magnet synchronous motor cannot be controlled when the voltage of the dc bus module is too low.
In an embodiment of the present invention, preferably, the step of counting the voltage value of the dc bus module in real time includes: and detecting the voltage value of the known resistor connected in parallel on the direct current bus module in real time.
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 module, specifically, by directly measuring the voltage value of the known resistor, the voltage of the dc bus module may be obtained, the voltage value of the dc bus module inconvenient to measure is converted into a resistor voltage value convenient to measure, the improvement on the hardware structure is small, and the measurement is simple and accurate, so as to control the operation of the permanent magnet synchronous motor according to the measurement result, ensure the voltage safety of the dc bus module, and avoid the occurrence of the device damage caused by the overhigh voltage of the dc bus module.
Fig. 3 shows a schematic flow chart of a power down protection control method according to still another embodiment of the present invention.
As shown in fig. 3, a power down protection control method according to still another embodiment of the present invention includes:
s302, counting the voltage value of the direct current bus module in real time;
s304, judging whether the voltage reduction time length of the voltage value reduced from the second preset voltage value to the third preset voltage value is less than or equal to the first preset time length, if so, turning to S306, and if not, returning to S304;
s306, starting timing to obtain a deceleration duration;
s308, entering a constant-voltage braking mode to control the permanent magnet synchronous motor to decelerate and brake according to a preset acceleration so as to enable the voltage value to be smaller than or equal to a first preset voltage value;
and S310, when the deceleration duration is greater than or equal to a second preset duration, if the motor is not stopped, exiting the constant-pressure braking mode and entering a normal operation mode.
In the embodiment, a deceleration duration is obtained by starting timing from the time of power failure determination, and meanwhile, a constant-voltage braking mode is entered to control the permanent magnet synchronous motor to gradually decelerate to stop, if the alternating current power supply side has power failure for a long time, the permanent magnet synchronous motor will finally stop after a period of time, by reasonably setting a second preset duration, when the deceleration duration is greater than or equal to the second preset duration, the permanent magnet synchronous motor should be in a stopped state, at the moment, if the permanent magnet synchronous motor is detected not to stop, it is indicated that only short-time power failure occurs at the alternating current power supply side, and therefore, the permanent magnet synchronous motor exits the constant-voltage braking mode and enters a normal operation mode, and can continue to operate.
In one embodiment of the present invention, 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 1 s.
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 that the power failure condition is accurately determined according to the first preset duration. The second preset time is less than or equal to 1s, preferably, the second preset time is less than or equal to 500ms, so that the constant-voltage braking mode can be exited and the normal operation mode can be entered if the motor is not stopped when the alternating-current power supply side is only powered off instantaneously.
As shown in fig. 4, an embodiment of a second aspect of the present invention provides a control module 10 for a permanent magnet synchronous motor control system, the control module 10 including: a memory 102 configured to store executable instructions; the processor 104 is configured to execute the stored instructions to implement the steps of the method according to any of the above embodiments, so that the method has all the technical effects of the power failure protection control method, and details are not described herein.
In particular, the memory 102 may include mass storage for data or instructions. By way of example, and not limitation, memory 102 may include a Hard Disk Drive (HDD), a floppy Disk Drive, flash memory, an optical Disk, a magneto-optical Disk, tape, or a Universal Serial Bus (USB) Drive or a combination of two or more of these. Memory 102 may include removable or non-removable (or fixed) media, where appropriate. The memory 102 may be internal or external to the integrated gateway disaster recovery device, where appropriate. In a particular embodiment, the memory 102 is a non-volatile solid-state memory. In particular embodiments, memory 102 includes Read Only Memory (ROM). Where appropriate, the ROM may be mask-programmed ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory or a combination of two or more of these.
The processor 104 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured as one or more Integrated circuits implementing embodiments of the present invention.
An embodiment of the third aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method according to any of the above technical solutions, so that the method has all the technical effects of the power-down protection control method, and details are not described herein.
Computer readable storage media may include any medium that can store or transfer information. Examples of computer readable storage media include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
As shown in fig. 5, an embodiment of the fourth aspect of the present invention provides a permanent magnet synchronous motor control system, which includes the control module 10 according to the above embodiment, so as to have all the technical effects of the control module 10, and no further description is provided herein.
As shown in fig. 5, in one embodiment of the present invention, preferably, the permanent magnet synchronous motor control system further includes: an alternating current power supply module 20, a rectifier module 30, a direct current bus module 40 and an IPM module 50; the alternating current power supply module 20 provides alternating current for the rectifying module 30; the rectifying module 30 rectifies the alternating current and outputs the direct current to the direct current bus module 40; the dc bus module 40 provides the IPM module 50 with filtered dc power; the IPM module 50 controls the operation of the permanent magnet synchronous motor according to the control command sent by the control module 10.
In this embodiment, other functional modules in the permanent magnet synchronous motor control system are specifically defined. The alternating current power supply module 20 is used for supplying alternating current to the rectifying module 30; the rectifying module 30 includes a diode, and an input end thereof is connected to the ac power supply module 20 to rectify ac power to obtain dc power; the input end of the direct current bus module 40 is connected with the output end of the rectification module 30, the direct current is filtered to obtain filtered direct current, and two ends of the filtered direct current are connected with capacitors in parallel; the power input end of the IPM module 50 is connected with the output end of the DC bus module 40, the DC bus module 40 provides filtered DC power, and the power output end of the IPM module 50 is connected with the permanent magnet synchronous motor to drive the permanent magnet synchronous motor to rotate or stop; the control module 10 is connected to the IPM module 50, and sends a control command to the IPM module 50, so that the IPM module 50 directly controls the operation of the permanent magnet synchronous motor, and specifically, the control module 10 is a micro-control module. According to the invention, by monitoring the voltage on the direct current bus module 40, when power failure is judged, the permanent magnet synchronous motor is controlled to enter a power generation state through braking until the permanent magnet synchronous motor is stopped, so that the voltage on the direct current bus module 40 is not increased in a surging manner, and the overvoltage condition is avoided. Therefore, the permanent magnet synchronous motor control system has a power failure protection function.
In one embodiment of the present invention, the IPM module 50 is preferably a three-phase bridge circuit composed of six switching tubes, and the switching tubes are IGBTs.
In this embodiment, the IPM module 50 provides electric energy for the pmsm, and the interior of the IPM module is integrated with the overvoltage, overcurrent, overheat and other fault detection circuits, so that when the power failure condition is determined, the pmsm can be braked and controlled to enter a power generation state until the pmsm is stopped by determining the states of all the switching tubes of the IPM module 50, and the voltage generated by the back electromotive force generated by the pmsm under the power failure condition at the dc bus module 40 is reduced, thereby avoiding the damage of components. The switching tube is an IGBT, which has characteristics of small driving power and low saturation voltage, and thus, the IPM module 50 using the IGBT can effectively degrade power consumption of the control system and reduce heat generation.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
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 (11)
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 power is lost or not according to the voltage value;
when power failure is judged, a constant-voltage braking mode is entered to control the permanent magnet synchronous motor to decelerate and brake according to a preset acceleration so as to enable the voltage value to be smaller than or equal to a first preset voltage value;
the IPM module is used for driving the permanent magnet synchronous motor to rotate or stop, and controlling the operation of the permanent magnet synchronous motor;
the step of judging whether the power is down according to the voltage value comprises the following steps:
judging whether the voltage reduction time length of the voltage value reduced from the second preset voltage value to the third preset voltage value is less than or equal to the first preset time length;
when the voltage reduction time length is less than or equal to the first preset time length, judging power failure;
after the step of judging whether the power is off according to the voltage value, before the operation of entering a constant voltage braking mode to control the permanent magnet synchronous motor to decelerate and brake according to a preset acceleration so as to enable the voltage value to be less than or equal to a first preset voltage value, the method further comprises the following steps:
when power failure is judged, timing is started to obtain a deceleration duration;
after entering the constant voltage braking mode to control the permanent magnet synchronous motor to decelerate and brake according to a preset acceleration so as to enable the voltage value to be less than or equal to a first preset voltage value, the method further comprises the following steps:
and when the deceleration duration is greater than or equal to a second preset duration, if the motor is not stopped, exiting the constant-pressure braking mode and entering a normal operation mode.
2. The power fail safeguard control method according to claim 1,
the third preset voltage value is greater than or equal to 1/3 times the second preset voltage value and less than or equal to 2/3 times the second preset voltage value.
3. The power fail safeguard control method according to claim 1,
the first preset voltage value is greater than or equal to the second preset voltage value and is smaller than the safe voltage of the direct current bus module.
4. The power-down protection control method according to claim 3, wherein the step of entering a constant voltage braking mode to control the permanent magnet synchronous motor to decelerate and brake at a preset acceleration so that the voltage value is less than or equal to a first preset voltage value comprises:
and entering a constant voltage braking mode to control the permanent magnet synchronous motor to decelerate and brake according to the preset acceleration so that the voltage value is smaller than or equal to the first preset voltage value and larger than or equal to the second preset voltage value.
5. The power-fail protection control method according to claim 1, wherein the step of performing real-time statistics on the voltage value of the dc bus module comprises:
and detecting the voltage value of the known resistor connected in parallel on the direct current bus module in real time.
6. The power fail safeguard control method according to claim 1,
the first preset time is less than or equal to 2ms, and the second preset time is less than or equal to 1 s.
7. A control module for a permanent magnet synchronous motor control system, comprising:
a memory configured to store executable instructions;
a processor configured to execute stored instructions to implement the steps of the method of any one of claims 1 to 6.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
9. A permanent magnet synchronous motor control system, comprising:
the control module of claim 7.
10. The permanent magnet synchronous motor control system according to claim 9, further comprising: the intelligent power supply comprises an alternating current power supply module, a rectifier module, a direct current bus module and an IPM module;
the alternating current power supply module provides alternating current for the rectifying module;
the rectification module rectifies the alternating current and outputs direct current to the direct current bus module;
the direct current bus module provides filtered direct current for the IPM module;
and the IPM module controls the permanent magnet synchronous motor to operate according to the control instruction sent by the control module.
11. The pmsm control system of claim 10, wherein the IPM module is a three-phase bridge circuit composed of six switching tubes, the switching tubes being IGBTs.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497154A (en) * | 2011-12-23 | 2012-06-13 | 中冶南方（武汉）自动化有限公司 | Method for avoiding shutdown of frequency converter under instantaneous power-down situation |
| CN104104307A (en) * | 2014-07-02 | 2014-10-15 | 上海新时达电气股份有限公司 | Outage endurance method of frequency converter |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9246432B2 (en) * | 2011-02-14 | 2016-01-26 | Beckman Coulter, Inc. | Regenerative braking safety system and method of use |
| CN102420552B (en) * | 2011-12-03 | 2014-04-30 | 太原理工大学 | Control loop and control method for improving starting and stopping performance of motor |
| US8963452B2 (en) * | 2012-09-20 | 2015-02-24 | Rohm Co., Ltd. | Motor drive device, magnetic disk storage device, and electronic appliance |
| CN105904996B (en) * | 2016-04-22 | 2018-04-06 | 北京新能源汽车股份有限公司 | Electric automobile and current loop control method and device of permanent magnet synchronous motor of electric automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102497154A (en) * | 2011-12-23 | 2012-06-13 | 中冶南方（武汉）自动化有限公司 | Method for avoiding shutdown of frequency converter under instantaneous power-down situation |
| CN104104307A (en) * | 2014-07-02 | 2014-10-15 | 上海新时达电气股份有限公司 | Outage endurance method of frequency converter |
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