CN112787495B - Variable frequency controller and control method thereof, variable frequency electric appliance and electronic equipment - Google Patents
Variable frequency controller and control method thereof, variable frequency electric appliance and electronic equipment Download PDFInfo
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- CN112787495B CN112787495B CN201911081296.3A CN201911081296A CN112787495B CN 112787495 B CN112787495 B CN 112787495B CN 201911081296 A CN201911081296 A CN 201911081296A CN 112787495 B CN112787495 B CN 112787495B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a variable frequency control and a control method thereof, a variable frequency electric appliance and electronic equipment, wherein the method comprises the following steps: acquiring a phase angle of input voltage of a power grid; calculating a weak magnetic current waveform value according to a power grid input voltage phase angle; obtaining the current average weak magnetic current value; obtaining a target weak magnetic current value according to the current average weak magnetic current value and the weak magnetic current waveform value; and carrying out flux weakening control on the variable frequency load according to the target flux weakening current value. Therefore, the variable frequency load is subjected to flux weakening control by obtaining the target flux weakening current value, the control stability of the variable frequency system can be effectively improved, the energy efficiency can be optimized, and engineering application is facilitated.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a control method of a variable frequency controller, the variable frequency appliance, electronic equipment and a computer readable storage medium.
Background
With the continuous improvement of living standard of people, the performance requirements of electric appliances such as air conditioning systems are gradually improved. In the related art, an electrolytic capacitor-free inverter system is adopted as an inverter system of an air conditioner.
However, the related art has problems in that, since the frequency converter system without the electrolytic capacitor removes the PFC module and the large electrolytic capacitor, the dc bus voltage has a characteristic of large ripple, the lowest voltage value near the zero crossing point is close to zero voltage, the current control loop is saturated, the current waveform is seriously distorted, and the back electromotive force is fed back to the control system, and particularly under a high speed condition, a large current generating effect is generated, thereby reducing the system efficiency and the stability of the system control,
disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first objective of the present invention is to provide a control method for a variable frequency controller, which can effectively improve the control stability of a variable frequency system, and simultaneously optimize energy efficiency, thereby facilitating engineering application.
The second objective of the present invention is to provide a variable frequency controller.
The third purpose of the invention is to provide a variable frequency electric appliance.
A fourth object of the invention is to propose an electronic device.
A fifth object of the present invention is to propose a computer-readable storage medium.
To achieve the above object, an embodiment of a first aspect of the present invention provides a method for controlling a variable frequency controller, including: acquiring a phase angle of input voltage of a power grid; calculating a weak magnetic current waveform value according to the power grid input voltage phase angle; obtaining the current average weak magnetic current value; obtaining a target weak magnetic current value according to the current average weak magnetic current value and the weak magnetic current waveform value; and carrying out flux weakening control on the variable frequency load according to the target flux weakening current value.
According to the control method of the variable frequency controller, firstly, a power grid input voltage phase angle is obtained, a weak magnetic current waveform value is calculated according to the power grid input voltage phase angle, then, a current average weak magnetic current value is obtained, a target weak magnetic current value is obtained according to the current average weak magnetic current value and the weak magnetic current waveform value, and finally, weak magnetic control is carried out on a variable frequency load according to the target weak magnetic current value. Therefore, according to the control method of the variable frequency controller provided by the embodiment of the invention, the variable frequency load is subjected to flux weakening control by obtaining the target flux weakening current value, so that the control stability of the variable frequency system can be effectively improved, the energy efficiency can be optimized, and the engineering application is facilitated.
According to an embodiment of the present invention, the calculating a weak magnetic current waveform value according to the grid input voltage phase angle includes: and calculating the weak magnetic current waveform value according to the power grid input voltage phase angle, the weak magnetic current waveform function and the weak magnetic current compensation coefficient.
According to one embodiment of the invention, the field weakening current compensation coefficient is a ratio of a direct current bus voltage lower limit value and a direct current bus voltage peak value.
In accordance with one embodiment of the present invention,
according to an embodiment of the present invention, the control method further includes: and carrying out amplitude limiting processing on the target weak magnetic current value.
According to an embodiment of the present invention, the performing the amplitude limiting process on the target weak magnetic current value includes: and if the target weak magnetic current value is lower than the weak magnetic current limiting value, correcting the target weak magnetic current value into the weak magnetic current limiting value.
In order to achieve the above object, a second aspect of the present invention provides a variable frequency controller, including: the acquisition module is used for acquiring a phase angle of input voltage of a power grid and acquiring a current average weak magnetic current value; and the control module is used for calculating a weak magnetic current waveform value according to the power grid input voltage phase angle, obtaining a target weak magnetic current value according to the current average weak magnetic current value and the weak magnetic current waveform value, and performing weak magnetic control on a variable frequency load according to the target weak magnetic current value.
According to the frequency conversion controller provided by the embodiment of the invention, the acquisition module is used for acquiring the phase angle of the input voltage of the power grid and acquiring the current average weak magnetic current value, the control module is used for calculating the weak magnetic current waveform value according to the phase angle of the input voltage of the power grid, acquiring the target weak magnetic current value according to the current average weak magnetic current value and the weak magnetic current waveform value, and carrying out weak magnetic control on the frequency conversion load according to the target weak magnetic current value. Therefore, the variable frequency controller of the embodiment of the invention performs the flux weakening control on the variable frequency load by obtaining the target flux weakening current value, can effectively improve the control stability of the variable frequency system, and can optimize the energy efficiency and facilitate the engineering application.
According to an embodiment of the invention, the control module is further configured to calculate the weak magnetic current waveform value according to the grid input voltage phase angle, the weak magnetic current waveform function and the weak magnetic current compensation coefficient.
According to one embodiment of the invention, the field weakening current compensation coefficient is a ratio of a direct current bus voltage lower limit value and a direct current bus voltage peak value.
In accordance with one embodiment of the present invention,
according to an embodiment of the present invention, the control module is further configured to perform amplitude limiting processing on the target weak magnetic current value.
According to an embodiment of the present invention, the control module is configured to modify the target weak magnetic current value to the weak magnetic current limit value when the target weak magnetic current value is lower than the weak magnetic current limit value.
In order to achieve the above object, an embodiment of a third aspect of the present invention provides an inverter appliance, including the inverter controller according to the embodiment of the second aspect of the present invention.
According to the variable frequency electric appliance provided by the embodiment of the invention, the control stability of a variable frequency system can be effectively improved through the arranged variable frequency controller, and meanwhile, the energy efficiency can be optimized, so that the variable frequency electric appliance is convenient for engineering application.
To achieve the above object, a fourth aspect of the present invention provides an electronic device, including: the invention relates to a frequency conversion controller, a memory, a processor and a computer program stored in the memory and capable of running on the processor.
According to the electronic equipment provided by the embodiment of the invention, when the processor executes a program, the control method of the variable frequency controller can be realized, so that the control stability of the variable frequency system can be effectively improved, the energy efficiency can be optimized, and the engineering application is facilitated.
To achieve the above object, a fifth embodiment 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 control method of the variable frequency controller according to the first embodiment of the present invention.
Drawings
Fig. 1 is a schematic flow chart of a control method of a variable frequency controller according to an embodiment of the invention;
FIG. 2 is a diagram of DC bus voltage waveforms in a method for controlling a variable frequency controller according to an embodiment of the invention;
FIG. 3 is a block diagram illustrating a method for controlling a variable frequency controller according to an embodiment of the present invention to obtain a current average flux weakening current value;
FIG. 4 is a waveform diagram of a target field weakening current in a control method of a variable frequency controller according to one embodiment of the invention;
FIG. 5 is a test waveform diagram of a control method of a variable frequency controller according to one embodiment of the invention;
fig. 6 is a block diagram of a variable frequency controller according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The variable frequency controller, the control method thereof, the variable frequency electric appliance, and the electronic device according to the embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a flowchart illustrating a control method of a variable frequency controller according to an embodiment of the present invention. As shown in fig. 1, the control method of the variable frequency controller according to the embodiment of the present invention includes the following steps:
s1, acquiring a power grid input voltage phase angle thetage。
It can be understood that, firstly, the grid input voltage is obtained in real time, for example, the grid input voltage value can be collected in real time through the voltage sampling circuit, wherein the grid input voltage is the real-time grid-side alternating-current input voltage filtered by the circuit port. Then, capturing the phase angle theta of the input voltage of the power grid in real time through a phase-locked loop modulegeOr the method of interpolation and zero crossing point detection is used for acquiring the phase angle theta of the input voltage of the power grid in real timege。
S2, according to the phase angle theta of the input voltage of the power gridgeCalculating the waveform value of weak magnetic current
According to one embodiment of the invention, the grid input voltage phase angle θ is determinedgeCalculating a weak magnetic current waveform value, comprising: according to the phase angle theta of the input voltage of the power gridgeCalculating the weak magnetic current waveform value by the weak magnetic current waveform function and the weak magnetic current compensation coefficient kappa
The weak magnetic current waveform value is a pulsating signal with a frequency twice the frequency of the input voltage of the power grid. The weak magnetic current waveform function can be a sine wave function, a square wave function or a trapezoidal wave function, and the invention takes the sine wave function as an example, and designs the weak magnetic current waveform function as shown in the following formula:
wherein the content of the first and second substances,
representing the waveform value of weak magnetic current, thetageRepresenting the phase angle of the grid input voltage, and k representing the flux weakening current compensation factor, whereby the grid input voltage phase angle theta is based ongeCalculating the weak magnetic current waveform function and the weak magnetic current compensation coefficient kappa to obtain the weak magnetic current waveform value
According to one embodiment of the invention, the weak magnetic current compensation coefficient k is the lower limit value U of the direct current bus voltagedc_minAnd the peak value U of the DC bus voltagedc_maxThe ratio of (a) to (b). I.e., k ═ Udc_min÷Udc_maxAs shown in fig. 2, the ordinate corresponding to L1 is the dc bus voltage lower limit, and the ordinate of point a represents the dc bus voltage peak.
For example, the dc bus voltage may be collected in real time by a voltage sampling circuit, where the dc bus voltage is a bus voltage provided to the inverter driving motor after the ac voltage at the network side is rectified, that is, a voltage at two ends of a thin film capacitor or a ceramic capacitor in the electrolytic capacitor-free variable frequency controller.
It can be understood that the phase angle theta is determined according to the input voltage of the power gridgeCalculating the weak magnetic current waveform function and the weak magnetic current compensation coefficient kappa to obtain the weak magnetic current waveform value
Then, for the weak magnetic current waveform value
Performing normalization process to obtain weak magnetic current waveform value
Limited to 0 to 1.
S3, obtaining the current average weak magnetic current value
According to one embodiment of the invention, the current average weak magnetic current value is obtained
Including obtaining magnitude | u of inverter output voltagesL, |; calculating the maximum allowable output voltage u of the invertersmaxAnd the amplitude | u of the inverter output voltagesDifferential voltage u of |mg(ii) a For difference voltage umgCarrying out filtering treatment; for the filtered difference voltage umg_avCarrying out proportional integral adjustment for resisting integral saturation to obtain the current average weak magnetic current value
It can be understood that in the control system without electrolytic capacitor, the direct current bus voltage is a pulsating signal which is twice the frequency of the input voltage of the power grid, so the principle of using an average voltage margin is considered, namely, an average weak magnetic current value which ensures the average voltage margin in a complete period is obtained, and weak magnetic voltage saturation removal in an average sense is realized. Specifically, as shown in fig. 3, the maximum allowable output voltage u of the invertersmaxAnd the amplitude | u of the inverter output voltagesDifferential voltage u of |mgEntering a low-pass filter, filtering out the periodic fluctuation of the bus voltage of the electrolytic capacitor-free variable frequency drive system by the filter to obtain a filtered differential voltage umg_avThen filteredProcessed difference voltage umg_avAnd adjusting by a PI closed-loop regulator module for resisting integral saturation to obtain the current average weak magnetic current value
Wherein the amplitude | u of the output voltage of the invertersL can be calculated by the following formula:
wherein u isdDenotes the d-axis voltage, uqRepresenting the q-axis voltage.
Maximum allowable output voltage u of invertersmaxCan be calculated by the following formula:
usmax＝udc*kmax*λ
wherein, UdcRepresenting the DC bus voltage, kmaxRepresenting the modulation factor, i.e. the ratio of the maximum output voltage of the inverter to the DC bus voltage, k, taking into account the case of linear modulationmaxIs convenient to use
And lambda represents the flux weakening margin of the direct current bus voltage, and the value of the flux weakening margin can be set according to the actual load condition. It should be noted that, for the variable frequency driving scheme without electrolytic capacitor, since the voltage value near the zero crossing point of the dc bus voltage is very low, the weakening magnetic margin of the dc bus voltage needs to be deepened compared with the scheme with electrolytic capacitor.
S4, according to the current average weak magnetic current value
And weak magnetic current waveform value
Obtaining the target weak magnetic current value
It can be understood that the target weak magnetic current value can be obtained according to the following formula
Wherein the content of the first and second substances,
is the waveform value of the weak magnetic current,
the current average weak magnetic current value is used. As shown in fig. 4, L2 represents a dc bus voltage waveform, and L3 represents a target field weakening current waveform.
According to an embodiment of the present invention, the control method of the variable frequency controller further includes: for target weak magnetic current value
And carrying out amplitude limiting processing.
It can be understood that the current value is based on the current average weak magnetic current
And weak magnetic current waveform value
Obtaining the target weak magnetic current value
Then, the target weak magnetic current value is set
Carrying out amplitude limiting treatment to obtain the final target weak magnetic current value, namely the target weak magnetic current value suitable for the electrolytic-capacitor-free variable frequency control system
Specifically, according to one embodiment of the present invention, the target field weakening current value is set
Performing a clipping process comprising: target weak magnetic current value
If the current is lower than the weak magnetic current limiting value, the target weak magnetic current value is set
And correcting the current to be a weak magnetic current amplitude limiting value.
It can be understood that if the current target weak magnetic current value is less than the set weak magnetic current limit value, the weak magnetic current limit value is taken as the final target weak magnetic current value, and if the current target weak magnetic current value is greater than or equal to the set weak magnetic current limit value, the current target weak magnetic current value is taken as the final target weak magnetic current value.
S5, according to the target weak magnetic current value
And carrying out weak magnetic control on the variable frequency load.
The inverter load may be an inverter compressor or the like.
It can be understood that the current value is weak for the target
And after amplitude limiting processing is carried out to obtain a final target weak magnetic current value, carrying out weak magnetic control on a variable frequency load such as a variable frequency compressor according to the final target weak magnetic current value. Specifically, the flux weakening current can be controlled by a current regulator for an inverter load, such as an inverter compressor, wherein the current regulator can be a feedback closed-loop regulator of a PID structure or other situations.
After the control method of the variable frequency controller of the embodiment of the invention is applied to control of the variable frequency drive system without the electrolytic capacitor, the obtained test waveform is shown in fig. 5, wherein L4 represents a power grid input current waveform, and L5 represents a bus voltage waveform. Therefore, the control method of the variable frequency controller provided by the embodiment of the invention can be used for carrying out field weakening control on the variable frequency load, can effectively improve the control stability of a variable frequency system, and can optimize the energy efficiency and facilitate engineering application.
In summary, according to the control method of the variable frequency controller in the embodiment of the present invention, the power grid input voltage phase angle is first obtained, the field weakening current waveform value is calculated according to the power grid input voltage phase angle, then the current average field weakening current value is obtained, the target field weakening current value is obtained according to the current average field weakening current value and the field weakening current waveform value, and finally the field weakening control is performed on the variable frequency load according to the target field weakening current value. Therefore, according to the control method of the variable frequency controller provided by the embodiment of the invention, the variable frequency load is subjected to flux weakening control by obtaining the target flux weakening current value, so that the control stability of the variable frequency system can be effectively improved, the energy efficiency can be optimized, and the engineering application is facilitated.
Based on the control method of the variable frequency controller of the above embodiment, the embodiment of the invention further provides a variable frequency controller.
Fig. 6 is a block schematic diagram of a variable frequency controller according to an embodiment of the present invention, and as shown in fig. 6, the variable frequency controller according to the embodiment of the present invention includes an obtaining module 10 and a control module 20.
The obtaining module 10 is configured to obtain a phase angle θ of a grid input voltagegeAnd obtaining the current average weak magnetic current value
The control module 20 is used for controlling the grid input voltage phase angle theta according to the grid input voltage phase angle thetageCalculating the waveform value of weak magnetic current
And according to the current average weak magnetic current value
And weak magnetic current waveform value
Obtaining the target weak magnetic current value
And according to the target weak magnetic current value
And carrying out weak magnetic control on the variable frequency load.
Further, according to an embodiment of the present invention, the control module 20 is further configured to determine the grid input voltage phase angle θgeCalculating the weak magnetic current waveform value by the weak magnetic current waveform function and the weak magnetic current compensation coefficient kappa
According to one embodiment of the invention, the weak magnetic current compensation coefficient k is the lower limit value U of the direct current bus voltagedc_minAnd the peak value U of the DC bus voltagedc_maxThe ratio of (a) to (b).
According to one embodiment of the invention, the control module 20 is configured to obtain the magnitude | u | of the inverter output voltagesL, calculating the maximum allowable output voltage u of the invertersmaxAnd the amplitude | u of the inverter output voltagesDifferential voltage u of |mgFor difference voltage umgFiltering, and processing the filtered differential voltage umg_avCarrying out proportional integral adjustment for resisting integral saturation to obtain the current average weak magnetic current value
According to an embodiment of the present invention, the control module 20 is further configured to dim the target current value
And carrying out amplitude limiting processing.
In particular, according to the present inventionIn one embodiment of the invention, the control module 20 is configured to control the current at the target field weakening current value
When the current is lower than the weak magnetic current limiting value, the target weak magnetic current value is set
And correcting the current to be a weak magnetic current amplitude limiting value.
It should be noted that the foregoing explanation of the embodiment of the control method of the variable frequency controller is also applicable to the variable frequency controller of the embodiment of the present invention, and is not repeated here.
In summary, according to the variable frequency controller provided by the embodiment of the invention, the acquisition module acquires the phase angle of the input voltage of the power grid and acquires the current average weak magnetic current value, the control module calculates the waveform value of the weak magnetic current according to the phase angle of the input voltage of the power grid, obtains the target weak magnetic current value according to the current average weak magnetic current value and the waveform value of the weak magnetic current, and performs weak magnetic control on the variable frequency load according to the target weak magnetic current value. Therefore, the variable frequency controller of the embodiment of the invention performs the flux weakening control on the variable frequency load by obtaining the target flux weakening current value, can effectively improve the control stability of the variable frequency system, and can optimize the energy efficiency and facilitate the engineering application.
Based on the frequency conversion controller of the above embodiment, an embodiment of the present invention further provides a frequency conversion electrical appliance, including the above frequency conversion controller.
It should be noted that the inverter appliance may be an inverter refrigerator, an inverter air conditioner, or the like.
According to the frequency conversion electric appliance provided by the embodiment of the invention, the control stability of a frequency conversion system can be effectively improved through the arranged frequency conversion controller, and meanwhile, the energy efficiency can be optimized, so that the frequency conversion electric appliance is convenient for engineering application.
Based on the control method of the variable frequency controller in the foregoing embodiment, an embodiment of the present invention further provides an electronic device, including: the controller comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, and when the processor executes the program, the control method of the variable frequency controller is realized.
According to the electronic equipment provided by the embodiment of the invention, when the processor executes a program, the control method of the variable frequency controller can be realized, so that the control stability of the variable frequency system can be effectively improved, the energy efficiency can be optimized, and the engineering application is facilitated.
Based on the control method of the variable frequency controller in the foregoing embodiments, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the control method of the variable frequency controller.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the 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.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (15)
1. A control method of a variable frequency controller is characterized by comprising the following steps:
acquiring a phase angle of input voltage of a power grid;
calculating a weak magnetic current waveform value according to the power grid input voltage phase angle;
obtaining the current average weak magnetic current value;
obtaining a target weak magnetic current value according to the current average weak magnetic current value and the weak magnetic current waveform value;
and carrying out flux weakening control on the variable frequency load according to the target flux weakening current value.
2. The control method according to claim 1, wherein the calculating a flux weakening current waveform value according to the grid input voltage phase angle comprises:
and calculating the weak magnetic current waveform value according to the power grid input voltage phase angle, the weak magnetic current waveform function and the weak magnetic current compensation coefficient.
3. The control method according to claim 2, wherein the field weakening current compensation factor is a ratio of a direct current bus voltage lower limit value and a direct current bus voltage peak value.
4. The control method according to claim 1, wherein the obtaining the current average weak magnetic current value includes:
obtaining the amplitude of the output voltage of the inverter;
calculating a difference voltage of the maximum allowable output voltage of the inverter and the amplitude of the output voltage of the inverter;
filtering the difference voltage;
and carrying out proportional integral adjustment for resisting integral saturation on the filtered difference voltage to obtain the current average weak magnetic current value.
5. The control method according to claim 1, characterized by further comprising:
and carrying out amplitude limiting processing on the target weak magnetic current value.
6. The control method according to claim 5, wherein the performing the clipping process on the target weak magnetic current value includes:
and if the target weak magnetic current value is lower than the weak magnetic current limiting value, correcting the target weak magnetic current value into the weak magnetic current limiting value.
7. A variable frequency controller, comprising:
the acquisition module is used for acquiring a phase angle of input voltage of a power grid and acquiring a current average weak magnetic current value;
and the control module is used for calculating a weak magnetic current waveform value according to the power grid input voltage phase angle, obtaining a target weak magnetic current value according to the current average weak magnetic current value and the weak magnetic current waveform value, and performing weak magnetic control on a variable frequency load according to the target weak magnetic current value.
8. The variable frequency controller of claim 7, wherein the control module is further configured to calculate the flux weakening current waveform value according to the grid input voltage phase angle, the flux weakening current waveform function and a flux weakening current compensation coefficient.
9. The variable frequency controller according to claim 8, wherein the field weakening current compensation factor is a ratio of a dc bus voltage lower limit value and a dc bus voltage peak value.
10. The frequency conversion controller according to claim 7, wherein the control module is configured to obtain a magnitude of an output voltage of the inverter, calculate a difference voltage between a maximum allowable output voltage of the inverter and the magnitude of the output voltage of the inverter, perform filtering processing on the difference voltage, and perform proportional-integral adjustment for resisting integral saturation on the filtered difference voltage to obtain the current average weak magnetic current value.
11. The variable frequency controller according to claim 7, wherein the control module is further configured to perform a clipping process on the target weak magnetic current value.
12. The variable frequency controller according to claim 11, wherein the control module is configured to modify the target weak magnetic current value to the weak magnetic current limit value when the target weak magnetic current value is lower than the weak magnetic current limit value.
13. A variable frequency electrical appliance, comprising: a variable frequency controller as claimed in any one of claims 7 to 12.
14. An electronic device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor implements the method of controlling a variable frequency controller according to any of claims 1-6.
15. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out a method of controlling a variable frequency controller according to any one of claims 1-6.
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| CN113411029B (en) * | 2021-05-26 | 2022-11-01 | 无锡小天鹅电器有限公司 | Motor control method and device and electrical equipment |
| CN114244225B (en) * | 2021-12-03 | 2024-04-12 | 淮安威灵电机制造有限公司 | Weak magnetic control method and device for motor, motor controller and motor control system |
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