CN114647270A - Method and device for controlling bus voltage of fan, storage medium and electronic device - Google Patents
Method and device for controlling bus voltage of fan, storage medium and electronic device Download PDFInfo
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- CN114647270A CN114647270A CN202210333231.9A CN202210333231A CN114647270A CN 114647270 A CN114647270 A CN 114647270A CN 202210333231 A CN202210333231 A CN 202210333231A CN 114647270 A CN114647270 A CN 114647270A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004364 calculation method Methods 0.000 claims abstract description 13
- 230000001276 controlling effect Effects 0.000 claims description 19
- 238000004590 computer program Methods 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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- General Physics & Mathematics (AREA)
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- Automation & Control Theory (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The embodiment of the invention discloses a method and a device for controlling the voltage of a fan bus, a storage medium and an electronic device, which are used for solving the problem of shutdown caused by overvoltage of the fan bus in the process of deceleration braking when a fan rotates against wind at a high speed before starting. The embodiment of the invention comprises the following steps: collecting the feedback frequency WrEst of the fan, and outputting a stator phase current Is according to the feedback frequency WrEst of the fan; collecting bus voltage Vdc of the fan, setting target voltage VdcRef, and outputting a bus voltage adjusting angle beta according to the bus voltage Vdc when the bus voltage Vdc is greater than the target voltage VdcRef; adjusting the direct-axis current Id and the quadrature-axis current Iq through the bus voltage adjusting angle beta and the stator phase current Is so that the bus voltage Vdc Is not greater than the target voltage VdcRef, wherein the calculation process Is as follows: id ═ -Is × sin β; iq ═ Is ═ cos β.
Description
Technical Field
The invention relates to the technical field of fan bus voltage control, in particular to a fan bus voltage control method, a fan bus voltage control device, a storage medium and an electronic device.
Background
The outdoor unit of the air conditioner is arranged outdoors, and is influenced by the wind direction, and the fan sometimes has the condition of counter-wind reversal.
Before the fan is started, if the phenomenon of upwind rotation exists, the fan is generally stopped firstly by deceleration and then started in a forward rotation mode. In the process of deceleration, the fan is equivalent to energy feedback, and the bus voltage can be increased. When the wind speed is low, the bus voltage is increased to a small extent in the process of decelerating and stopping the fan; when the wind speed is higher, the voltage of the bus can rapidly rise in the process that the fan is decelerated and stopped until the bus is subjected to overvoltage protection, and then the shutdown condition is caused.
Therefore, in order to avoid the shutdown condition caused by the overvoltage of the fan bus, it is an important subject of research by those skilled in the art to find a fan bus voltage control method, device, storage medium and electronic device.
Disclosure of Invention
The embodiment of the invention discloses a method and a device for controlling the voltage of a fan bus, a storage medium and an electronic device, which are used for solving the problem of shutdown caused by overvoltage of the fan bus in the process of deceleration braking when a fan rotates against wind at a high speed before starting.
The embodiment of the invention provides a method for controlling the bus voltage of a fan, which comprises the following steps:
collecting the feedback frequency WrEst of the fan, and outputting a stator phase current Is according to the feedback frequency WrEst of the fan;
collecting bus voltage Vdc of the fan, setting target voltage VdcRef, and outputting a bus voltage adjusting angle beta according to the bus voltage Vdc when the bus voltage Vdc is greater than the target voltage VdcRef;
adjusting the direct-axis current Id and the quadrature-axis current Iq through the bus voltage adjusting angle beta and the stator phase current Is so that the bus voltage Vdc Is not greater than the target voltage VdcRef, wherein the calculation process Is as follows:
Id＝-Is*sinβ；Iq＝Is*cosβ。
optionally, the outputting the stator phase current Is according to the feedback frequency WrEst of the fan specifically includes:
and setting a target frequency WrRef of the fan, subtracting a feedback frequency WrEst from the target frequency WrRef, and regulating and outputting the stator phase current Is through PI.
Optionally, the outputting the bus voltage adjustment angle β according to the bus voltage Vdc specifically includes:
and subtracting the bus voltage Vdc from the target voltage VdcRef, and regulating the output bus voltage by using PI to regulate the angle beta.
Optionally, when the bus voltage Vdc Is less than or equal to the target voltage VdcRef, the direct-axis current Id Is made 0, and the quadrature-axis current Iq Is k Is, where 0 < k ≦ 1.
Optionally, the acquiring the feedback frequency WrEst of the fan specifically includes:
and acquiring the feedback frequency WrEst of the fan in a mode of observer or encoder or current zero crossing point.
Optionally, the acquiring the bus voltage Vdc of the wind turbine specifically includes:
and collecting the bus voltage Vdc of the fan through a sampling circuit.
Optionally, the fan is a permanent magnet synchronous motor or an asynchronous motor.
The embodiment of the invention provides a fan bus voltage control device, which comprises:
the first acquisition and calculation module Is used for acquiring the feedback frequency WrEst of the fan and outputting the stator phase current Is according to the feedback frequency WrEst of the fan;
the second acquisition and calculation module is used for acquiring the bus voltage Vdc of the fan, setting a target voltage VdcRef and outputting a bus voltage adjusting angle beta according to the bus voltage Vdc when the bus voltage Vdc is greater than the target voltage VdcRef;
the processing and adjusting module Is used for adjusting the direct-axis current Id and the quadrature-axis current Iq through the bus voltage adjusting angle beta and the stator phase current Is so that the bus voltage Vdc Is not greater than the target voltage VdcRef, and the calculation process Is as follows:
Id＝-Is*sinβ；Iq＝Is*cosβ。
an embodiment of the present invention provides a storage medium having a computer program stored therein, the computer program being configured to perform the above method when executed.
An embodiment of the present invention provides an electronic apparatus, which includes a memory and a processor, where the memory stores a computer program, and the processor is configured to execute the computer program to perform the above method.
According to the technical scheme, the embodiment of the invention has the following advantages:
in the embodiment, the direct-axis current Id and the quadrature-axis current Iq (the direct-axis current Id Is used for controlling the bus voltage, and the quadrature-axis current Iq Is used for controlling the motor torque) are adjusted in real time through the bus voltage adjusting angle β and the stator phase current Is, so that the direct-axis current Id Is consumed in a heat form to reduce the bus charging current.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a first process of a method for controlling a bus voltage of a wind turbine provided in an embodiment of the present invention;
fig. 2 is a second flowchart of a method for controlling a bus voltage of a wind turbine according to an embodiment of the present invention;
fig. 3 is a third flow chart of a fan bus voltage control method provided in the embodiment of the present invention.
Detailed Description
The embodiment of the invention discloses a method and a device for controlling the voltage of a fan bus, a storage medium and an electronic device, which are used for solving the problem of shutdown caused by overvoltage of the fan bus in the process of deceleration braking when a fan rotates against wind at a high speed before starting.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example one
The method for controlling the bus voltage of the fan is suitable for the starting stage of the fan, the fan is in a power generation state in the reverse speed reduction process, the bus capacitor is charged, the higher the wind speed is or the faster the speed reduction time is, the higher the current of the fan is, the faster the bus voltage is increased, the more easily the bus overvoltage is caused, and a Permanent Magnet Synchronous Motor (PMSM) or an asynchronous motor is adopted by the fan of the air conditioner.
Referring to fig. 1, a method for controlling a bus voltage of a wind turbine in this embodiment includes the following steps:
collecting the feedback frequency WrEst of the fan, and outputting a stator phase current Is according to the feedback frequency WrEst of the fan;
collecting bus voltage Vdc of the fan, setting target voltage VdcRef, and outputting a bus voltage adjusting angle beta according to the bus voltage Vdc when the bus voltage Vdc is greater than the target voltage VdcRef;
adjusting the direct-axis current Id and the quadrature-axis current Iq through the bus voltage adjusting angle beta and the stator phase current Is so that the bus voltage Vdc Is not greater than the target voltage VdcRef, wherein the calculation process Is as follows:
Id＝-Is*sinβ；Iq＝Is*cosβ。
in the embodiment, the direct-axis current Id and the quadrature-axis current Iq (the direct-axis current Id Is used for controlling the bus voltage, and the quadrature-axis current Iq Is used for controlling the motor torque) are adjusted in real time through the bus voltage adjusting angle beta and the stator phase current Is, so that the direct-axis current Id Is consumed in a heat form to reduce the bus charging current, when the bus voltage Vdc Is greater than the target voltage VdcRef, the voltage difference Is larger, the bus voltage adjusting angle beta Is larger, more direct-axis current Id Is consumed in a heat form, and the bus voltage Is gradually reduced below the target voltage, so that the problem of shutdown caused by overvoltage of a fan bus in the deceleration braking process when the fan rotates against the wind at a high speed before starting can be solved.
Further, the step of outputting the stator phase current Is according to the feedback frequency WrEst of the fan in this embodiment specifically includes:
and setting a target frequency WrRef of the fan, subtracting a feedback frequency WrEst from the target frequency WrRef, and regulating and outputting the stator phase current Is through PI.
It should be noted that the target frequency WrRef needs to be set by a designer according to different fan models, and the specific value of the target frequency WrRe is not limited in this embodiment.
Further, in this embodiment, the step of outputting the bus voltage adjustment angle β according to the bus voltage Vdc specifically includes:
and subtracting the bus voltage Vdc from the target voltage VdcRef, and regulating the output bus voltage by using PI to regulate the angle beta.
It should be noted that the target voltage VdcRef may be set according to the bus capacitance, and the specific value of the target voltage VdcRef is not limited in this embodiment.
Further, the PI is an abbreviation for PI regulator, which is a linear controller that forms a control deviation according to a given value and an actual output value, and linearly combines the proportion and the integral of the deviation to form a control quantity to control a controlled object.
Further, when the bus voltage Vdc Is less than or equal to the target voltage VdcRef, the direct axis current Id Is 0, and the quadrature axis current Iq Is k Is, wherein k Is greater than 0 and less than or equal to 1.
When the bus voltage Vdc Is less than or equal to the target voltage VdcRef, the bus voltage Vdc Is not in overvoltage condition, the PI regulation Is not in effect, the direct-axis current Id Is 0, and the quadrature-axis current Iq Is k Is, wherein k Is greater than 0 and less than or equal to 1.
Further, in this embodiment, the step of acquiring the feedback frequency WrEst of the fan specifically includes:
and measuring and acquiring the feedback frequency WrEst of the fan by an observer.
It should be noted that the observer in this embodiment is a prior art, and can be used to measure the feedback frequency WrEst of the wind turbine. In addition, the feedback frequency WrEs of the fan can be acquired by adopting an encoder or a current zero crossing point mode.
Further, the collecting of the bus voltage Vdc of the wind turbine in this embodiment specifically includes:
and collecting the bus voltage Vdc of the fan through a sampling circuit.
It should be noted that, the sampling circuit in this embodiment is the prior art, and a designer may select a suitable sampling circuit to obtain the bus voltage Vdc of the fan according to an actual situation.
Example two
The embodiment of the invention provides a fan bus voltage control device, which comprises:
the first acquisition and calculation module Is used for acquiring the feedback frequency WrEst of the fan and outputting the stator phase current Is according to the feedback frequency WrEst of the fan;
the second acquisition and calculation module is used for acquiring the bus voltage Vdc of the fan, setting a target voltage VdcRef and outputting a bus voltage adjusting angle beta according to the bus voltage Vdc when the bus voltage Vdc is greater than the target voltage VdcRef;
the processing and adjusting module Is used for adjusting the direct-axis current Id and the quadrature-axis current Iq through the bus voltage adjusting angle beta and the stator phase current Is so that the bus voltage Vdc Is not greater than the target voltage VdcRef, and the calculation process Is as follows:
Id＝-Is*sinβ；Iq＝Is*cosβ。
in this embodiment, the blower bus voltage control device can adjust the direct axis current Id and the quadrature axis current Iq (the direct axis current Id Is used for controlling the bus voltage, and the quadrature axis current Iq Is used for controlling the motor torque) in real time through the bus voltage adjustment angle β and the stator phase current Is, so that the direct axis current Id Is consumed in a heat form to reduce the bus charging current.
EXAMPLE III
An embodiment of the present invention provides a storage medium, in which a computer program is stored, where the computer program is configured to execute the method described in the first embodiment when the computer program runs.
Example four
An embodiment of the present invention provides an electronic apparatus, which includes a memory and a processor, where the memory stores a computer program, and the processor is configured to execute the computer program to perform the method described in the first embodiment.
It should be noted that the electronic device may be an air conditioner.
In the above description, the method, the apparatus, the storage medium, and the electronic apparatus for controlling the bus voltage of the wind turbine provided by the present invention are described in detail, and a person skilled in the art may change the specific implementation manner and the application scope according to the idea of the embodiment of the present invention.
Claims (10)
1. A method for controlling the bus voltage of a fan is characterized by comprising the following steps:
collecting the feedback frequency WrEst of the fan, and outputting a stator phase current Is according to the feedback frequency WrEst of the fan;
collecting bus voltage Vdc of the fan, setting target voltage VdcRef, and outputting a bus voltage adjusting angle beta according to the bus voltage Vdc when the bus voltage Vdc is greater than the target voltage VdcRef;
adjusting the direct-axis current Id and the quadrature-axis current Iq through the bus voltage adjusting angle beta and the stator phase current Is so that the bus voltage Vdc Is not greater than the target voltage VdcRef, wherein the calculation process Is as follows:
Id＝-Is*sinβ；Iq＝Is*cosβ。
2. the method for controlling the bus voltage of the fan according to claim 1, wherein the outputting the stator phase current Is according to the feedback frequency WrEst of the fan specifically comprises:
and setting a target frequency WrRef of the fan, subtracting a feedback frequency WrEst from the target frequency WrRef, and regulating and outputting the stator phase current Is through PI.
3. The wind turbine bus voltage control method according to claim 2, wherein the outputting the bus voltage adjustment angle β according to the bus voltage Vdc specifically comprises:
and subtracting the bus voltage Vdc from the target voltage VdcRef, and regulating the output bus voltage by using PI to regulate the angle beta.
4. The method for controlling the bus voltage of the wind turbine according to claim 3, wherein when the bus voltage Vdc Is less than or equal to the target voltage VdcRef, the direct-axis current Id Is 0, and the quadrature-axis current Iq Is k Is, wherein k Is greater than 0 and less than or equal to 1.
5. The method for controlling the bus voltage of the wind turbine according to claim 1, wherein the collecting the feedback frequency WrEst of the wind turbine specifically comprises:
and acquiring the feedback frequency WrEst of the fan in a mode of observer or encoder or current zero crossing point.
6. The wind turbine bus voltage control method according to claim 1, wherein the collecting of the bus voltage Vdc of the wind turbine specifically comprises:
and collecting the bus voltage Vdc of the fan through a sampling circuit.
7. The method for controlling the bus voltage of the wind turbine according to claim 1, wherein the wind turbine employs a permanent magnet synchronous motor or an asynchronous motor.
8. A fan bus voltage control device, comprising:
the first acquisition and calculation module Is used for acquiring the feedback frequency WrEst of the fan and outputting the stator phase current Is according to the feedback frequency WrEst of the fan;
the second acquisition and calculation module is used for acquiring the bus voltage Vdc of the fan, setting a target voltage VdcRef and outputting a bus voltage adjusting angle beta according to the bus voltage Vdc when the bus voltage Vdc is greater than the target voltage VdcRef;
the processing and adjusting module Is used for adjusting the direct-axis current Id and the quadrature-axis current Iq through the bus voltage adjusting angle beta and the stator phase current Is so that the bus voltage Vdc Is not greater than the target voltage VdcRef, and the calculation process Is as follows:
Id＝-Is*sinβ；Iq＝Is*cosβ。
9. a storage medium, in which a computer program is stored, which computer program is arranged to, when executed, perform the method of any one of claims 1 to 6.
10. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, and wherein the processor is arranged to execute the computer program to perform the method of any of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210333231.9A CN114647270A (en) | 2022-03-31 | 2022-03-31 | Method and device for controlling bus voltage of fan, storage medium and electronic device |
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| CN202210333231.9A CN114647270A (en) | 2022-03-31 | 2022-03-31 | Method and device for controlling bus voltage of fan, storage medium and electronic device |
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| US6304052B1 (en) * | 2000-06-27 | 2001-10-16 | General Motors Corporation | Control system for a permanent magnet motor |
| JP2007028774A (en) * | 2005-07-14 | 2007-02-01 | Ebara Densan Ltd | Driver of brushless motor |
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