CN113654202B - Control method and device of three-phase direct-current variable frequency air conditioner - Google Patents

Control method and device of three-phase direct-current variable frequency air conditioner Download PDF

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CN113654202B
CN113654202B CN202110976157.8A CN202110976157A CN113654202B CN 113654202 B CN113654202 B CN 113654202B CN 202110976157 A CN202110976157 A CN 202110976157A CN 113654202 B CN113654202 B CN 113654202B
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controller
temperature difference
variable frequency
value
temperature
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CN113654202A (en
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卢嘉豪
陈豪君
彭丹
陈杰隆
洪锐媛
袁伟轩
曾云
孔祥轩
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Guangdong Power Grid Co Ltd
Foshan Power Supply Bureau of Guangdong Power Grid Corp
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Guangdong Power Grid Co Ltd
Foshan Power Supply Bureau of Guangdong Power Grid Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a control method and a device of a three-phase direct current variable frequency air conditioner, wherein the method comprises the following steps of S1, obtaining an indoor temperature value, a temperature set value of a remote controller and a controller parameter; the controller parameters include: a proportionality coefficient of the torque controller and an integral coefficient of the torque controller; s2, calculating according to a first preset formula based on the temperature set value and the indoor temperature value to obtain a temperature deviation value; s3, determining a target refrigeration mode of the three-phase direct-current variable frequency air conditioner according to the temperature deviation value; s4, adjusting the real-time torque of the variable frequency transformer to a driving torque set value corresponding to the target refrigeration mode; s5, obtaining a target armature voltage according to a fifth preset formula; and S6, processing the target armature voltage by using the pulse width modulation module to obtain a switch control signal for controlling the thyristor rectifier bridge, inputting the switch control signal into the controller, and returning to execute the S1. Thereby greatly reducing the manufacturing cost of the three-phase direct current variable frequency air conditioner product.

Description

Control method and device of three-phase direct-current variable frequency air conditioner
Technical Field
The invention relates to the technical field of variable frequency air conditioner control, in particular to a control method and a control device of a three-phase direct current variable frequency air conditioner.
Background
With the continuous development of economy, the living standard of residents is increasing day by day, and the air conditioner becomes a common household appliance, and is more important in heat preservation load in summer and winter.
The air conditioner is divided into a fixed frequency air conditioner and a variable frequency air conditioner according to the rotating speed of a compressor, and the variable frequency air conditioner is divided into an alternating current variable frequency air conditioner and a direct current variable frequency air conditioner according to the type of the compressor. The fixed-frequency air conditioner occupies a main share of the air conditioner market due to the characteristics of low price, stability, reliability, less failure and the like.
Although the inverter air conditioner products are gradually mature along with the continuous improvement of the inverter air conditioner technology, and the inverter air conditioner has the characteristics of faster and more stable temperature control, higher efficiency, energy conservation, lower noise and the like, the inverter air conditioner still has the problem of higher manufacturing cost at the present stage and needs to be solved.
Disclosure of Invention
The invention provides a control method and a control device of a three-phase direct-current variable frequency air conditioner, which greatly reduce the manufacturing cost of the three-phase direct-current variable frequency air conditioner and achieve the effects of reducing electric energy loss and improving energy conversion efficiency.
In a first aspect, a method for controlling a three-phase dc inverter air conditioner according to an embodiment of the present invention includes:
s1, acquiring an indoor temperature value, a temperature set value of a remote controller and a controller parameter; the controller parameters include: a proportionality coefficient of the torque controller and an integral coefficient of the torque controller;
s2, calculating according to a first preset formula based on the temperature set value and the indoor temperature value to obtain a temperature deviation value;
s3, determining a target refrigeration mode of the three-phase direct-current variable frequency air conditioner according to the temperature deviation value;
s4, adjusting the real-time torque of the variable frequency transformer to a driving torque set value corresponding to the target refrigeration mode;
s5, calculating the armature voltage of the direct current motor in the variable frequency transformer according to a fifth preset formula based on the driving torque given value, the proportional coefficient of the torque controller and the integral coefficient of the torque controller to obtain a target armature voltage;
and S6, processing the target armature voltage by using a pulse width modulation module to obtain a switch control signal for controlling the thyristor rectifier bridge, inputting the switch control signal into the controller, and returning to execute the step S1.
Optionally, the cooling mode comprises: a rapid cooling mode, a general cooling mode and an energy-saving cooling mode; the step S3 includes:
s31, judging whether the temperature deviation value is larger than a first preset temperature threshold value or not; if so, the three-phase direct-current variable frequency air conditioner enters the rapid refrigeration mode; if not, the step S32 is executed;
s32, judging whether the temperature deviation value is larger than a second preset temperature threshold value or not; if so, the three-phase direct-current variable frequency air conditioner enters the general refrigeration mode; and if not, the three-phase direct-current variable frequency air conditioner enters the energy-saving refrigeration mode.
Optionally, the controller parameters further include: the proportional coefficient of the first temperature difference controller, the integral coefficient of the first temperature difference controller, the proportional coefficient of the second temperature difference controller, the integral coefficient of the second temperature difference controller, the proportional coefficient of the third temperature difference controller and the integral coefficient of the third temperature difference controller; the step S4 includes:
when the target refrigeration mode is the quick refrigeration mode, adjusting the given driving torque value to be the given driving torque value calculated according to a second preset formula on the basis of the proportionality coefficient of the first temperature difference controller and the integral coefficient of the first temperature difference controller;
when the target refrigeration mode is the general refrigeration mode, adjusting the given driving torque value to be the given driving torque value calculated according to a third preset formula on the basis of the proportionality coefficient of the second temperature difference controller and the integral coefficient of the second temperature difference controller;
and when the target refrigeration mode is the energy-saving refrigeration mode, adjusting the given driving torque value to be the given driving torque value calculated according to a fourth preset formula on the basis of the proportionality coefficient of the third temperature difference controller and the integral coefficient of the third temperature difference controller.
Optionally, the first preset formula is:
ΔT＝T * -T
the second preset formula is as follows:
Figure BDA0003227369430000021
the third preset formula is as follows:
Figure BDA0003227369430000031
the fourth preset formula is as follows:
Figure BDA0003227369430000032
the fifth preset formula is as follows:
Figure BDA0003227369430000033
wherein, delta T is a temperature deviation value T * Is a temperature set value of the remote controller, T is an indoor temperature value, s is a Laplace operator,
Figure BDA0003227369430000034
set value for the drive torque of a variable frequency transformer, K p1 Is the proportionality coefficient of the first temperature difference controller, K i1 Is an integral coefficient, T, of the first temperature difference controller 1 Is a first predetermined temperature threshold, K p2 Is the proportionality coefficient of the second temperature difference controller, K i2 Is the integral coefficient, T, of the second temperature difference controller 2 Is a second predetermined temperature threshold, K p3 Is the proportionality coefficient of the third temperature difference controller, K i3 Is the integral coefficient, T, of the third temperature difference controller 3 Is the third pre-set temperature threshold value,
Figure BDA0003227369430000035
is the armature voltage of the DC motor, K p4 As a proportionality coefficient of the torque controller, K i4 Is an integral coefficient of a torque controller, T dc Is the real-time torque of the variable frequency transformer.
In a second aspect, an embodiment of the present invention provides a control device for a three-phase dc inverter air conditioner, including:
the acquisition module is used for acquiring an indoor temperature value, a temperature set value of the remote controller and a controller parameter; the controller parameters include: a proportionality coefficient of the torque controller and an integral coefficient of the torque controller;
the temperature deviation value determining module is used for calculating according to a first preset formula based on the temperature set value and the indoor temperature value to obtain a temperature deviation value;
the refrigeration mode determining module is used for determining a target refrigeration mode of the three-phase direct current variable frequency air conditioner according to the temperature deviation value;
the driving torque given value determining module is used for adjusting the real-time torque of the variable frequency transformer to a driving torque given value corresponding to the target refrigeration mode;
the target armature voltage determining module is used for calculating the armature voltage of the direct current motor in the variable frequency transformer according to a fifth preset formula based on the driving torque given value, the proportional coefficient of the torque controller and the integral coefficient of the torque controller to obtain the target armature voltage;
and the control module is used for processing the target armature voltage by using the pulse width modulation module to obtain a switch control signal for controlling the thyristor rectifier bridge, inputting the switch control signal into the controller and returning to the execution of the acquisition module.
Optionally, the cooling mode comprises: a rapid cooling mode, a general cooling mode and an energy-saving cooling mode; the cooling mode determination module includes:
the first judgment sub-module is used for judging whether the temperature deviation value is larger than a first preset temperature threshold value or not; if so, the three-phase direct-current variable frequency air conditioner enters the rapid refrigeration mode; if not, executing a second judgment sub-module;
the second judgment submodule is used for judging whether the temperature deviation value is larger than a second preset temperature threshold value or not; if so, the three-phase direct-current variable frequency air conditioner enters the general refrigeration mode; and if not, the three-phase direct-current variable frequency air conditioner enters the energy-saving refrigeration mode.
Optionally, the controller parameters further include: the proportional coefficient of the first temperature difference controller, the integral coefficient of the first temperature difference controller, the proportional coefficient of the second temperature difference controller, the integral coefficient of the second temperature difference controller, the proportional coefficient of the third temperature difference controller and the integral coefficient of the third temperature difference controller; the drive torque set point determination module includes:
the first adjusting submodule is used for adjusting the driving torque given value to be a driving torque given value calculated according to a second preset formula on the basis of a proportionality coefficient of the first temperature difference controller and an integral coefficient of the first temperature difference controller when the target refrigeration mode is the quick refrigeration mode;
the second adjusting submodule is used for adjusting the driving torque given value to be a driving torque given value calculated according to a third preset formula on the basis of the proportionality coefficient of the second temperature difference controller and the integral coefficient of the second temperature difference controller when the target refrigeration mode is the general refrigeration mode;
and the third adjusting submodule is used for adjusting the driving torque given value to be the driving torque given value calculated according to a fourth preset formula on the basis of the proportionality coefficient of the third temperature difference controller and the integral coefficient of the third temperature difference controller when the target refrigeration mode is the energy-saving refrigeration mode.
Optionally, the first preset formula is:
ΔT＝T * -T
the second preset formula is as follows:
Figure BDA0003227369430000041
the third preset formula is as follows:
Figure BDA0003227369430000042
the fourth preset formula is as follows:
Figure BDA0003227369430000051
the fifth preset formula is as follows:
Figure BDA0003227369430000052
wherein, delta T is the temperature deviation value T * Is a temperature set value of the remote controller, T is an indoor temperature value, s is a Laplace operator,
Figure BDA0003227369430000053
set value for the drive torque of a variable frequency transformer, K p1 Is the proportionality coefficient of the first temperature difference controller, K i1 Is an integral coefficient, T, of the first temperature difference controller 1 Is a first predetermined temperature threshold, K p2 Is the proportionality coefficient of the second temperature difference controller, K i2 Is the integral coefficient, T, of the second temperature difference controller 2 Is a second predetermined temperature threshold, K p3 Is the proportionality coefficient of the third temperature difference controller, K i3 Is the integral coefficient, T, of the third temperature difference controller 3 Is the third pre-set temperature threshold value,
Figure BDA0003227369430000054
is the armature voltage of the DC motor, K p4 As a proportionality coefficient of the torque controller, K i4 Is torque momentIntegral coefficient of controller, T dc Is the real-time torque of the variable frequency transformer.
In a third aspect, the present invention provides an electronic device comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, which when executed by the processor, implement the steps of the method according to the first aspect.
In a fourth aspect, the present invention provides a readable storage medium on which is stored a program or instructions which, when executed by a processor, performs the steps of the method according to the first aspect.
According to the technical scheme, the invention has the following advantages:
the invention is applied to a three-phase direct current variable frequency air conditioner, which comprises: s1, acquiring an indoor temperature value, a temperature set value of a remote controller and a controller parameter; the controller parameters include: a proportionality coefficient of the torque controller and an integral coefficient of the torque controller; s2, calculating according to a first preset formula based on the temperature set value and the indoor temperature value to obtain a temperature deviation value; s3, determining a target refrigeration mode of the three-phase direct-current variable frequency air conditioner according to the temperature deviation value; s4, adjusting the real-time torque of the variable frequency transformer to a driving torque set value corresponding to the target refrigeration mode; s5, calculating the armature voltage of the direct current motor in the variable frequency transformer according to a fifth preset formula based on the driving torque given value, the proportional coefficient of the torque controller and the integral coefficient of the torque controller to obtain a target armature voltage; and S6, processing the target armature voltage by using a pulse width modulation module to obtain a switch control signal for controlling the thyristor rectifier bridge, inputting the switch control signal into the controller, and returning to execute the step S1.
The technical scheme of the invention adopts the variable frequency transformer as the frequency converter, simplifies the electric energy conversion link of the frequency converter from the traditional 'AC-DC-AC' to 'AC-AC', reduces the first-stage electric energy conversion link, thereby reducing the electric energy loss and improving the energy conversion efficiency. Meanwhile, the variable frequency transformer does not generate harmonic waves, the thyristor rectifier bridge can carry out controllable rectification, the generated harmonic waves are greatly reduced, and the electric energy quality of a grid-connected point is obviously improved. In addition, the cost of the variable frequency transformer is much lower than that of a fully-controlled power electronic device, and the manufacturing cost of a three-phase direct-current variable frequency air conditioner product is greatly reduced. Finally, the three-phase direct current variable frequency air conditioner with the structure is simple to control, only the torque of the variable frequency transformer is needed to carry out closed loop adjustment, and torque pulsation cannot be generated.
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 introduced below, 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 the drawings without creative efforts;
FIG. 1 is a flowchart illustrating steps of an embodiment of a method for controlling a three-phase DC inverter air conditioner according to the present invention;
FIG. 2 is a schematic structural diagram of a three-phase DC inverter air conditioner according to an embodiment of the present invention;
fig. 3 is a block diagram of a control device of a three-phase dc inverter air conditioner according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a control method and a control device of a three-phase direct-current variable-frequency air conditioner, which greatly reduce the manufacturing cost of the three-phase direct-current variable-frequency air conditioner and achieve the effects of reducing electric energy loss and improving energy conversion efficiency.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, the frequency conversion function of a three-phase air conditioner is realized mainly by adding a frequency converter consisting of a diode rectifier bridge and a power module between a low-voltage power grid and a three-phase permanent magnet synchronous motor. This approach exists: the energy conversion efficiency is low, the quality of the electric energy of the grid-connected point is low, and torque pulsation can be generated, and more importantly, the product cost of the three-phase direct current variable frequency air conditioner is high due to the mode.
Referring to fig. 1, a flowchart of steps of an embodiment of a control method of a three-phase dc inverter air conditioner according to the present invention is shown, and is applied to the three-phase dc inverter air conditioner shown in fig. 2; referring to fig. 2, fig. 2 is a schematic structural diagram of a three-phase dc inverter air conditioner according to an embodiment of the present invention, including: the system comprises a thyristor rectifier bridge 7, a direct current capacitor 8, a variable frequency transformer 9, a three-phase permanent magnet synchronous motor 10 and a controller 11; the outgoing line of the low-voltage power grid 6 is respectively and electrically connected with the alternating current side of the thyristor rectifier bridge 7 and the variable frequency transformer 9; the direct current side of the thyristor rectifier bridge 7 is electrically connected with the variable frequency transformer 9 through a direct current capacitor 8; the variable frequency transformer 9 is electrically connected with the three-phase permanent magnet synchronous motor 10; the controller 11 is connected to the switching control input of the thyristor rectifier bridge 7. Further, the variable frequency transformer 9 includes: a doubly-fed motor 91 and a direct current motor 92 connected to each other; the stator side of the doubly-fed motor 91 is connected with the outgoing line of the low-voltage power grid 6; the rotor side of the doubly-fed motor 91 is electrically connected with the three-phase permanent magnet synchronous motor 10; the dc capacitor 6 is electrically connected to the armature of the dc motor 92.
In the embodiment of the present invention, the torque of the variable frequency transformer 9 is controlled according to the frequency required by the three-phase permanent magnet synchronous motor 10, so that the frequency of the three-phase permanent magnet synchronous motor 10 is more specifically changed by the torque of the variable frequency transformer 9.
In specific implementation, the frequency conversion process of the three-phase dc frequency conversion air conditioner in this embodiment is as follows: the power frequency alternating current of the low-voltage bus 6 is controllably rectified and reduced by the thyristor rectifier bridge 7 and then is changed into direct current voltage required by a direct current motor armature of the variable frequency transformer 9, then the armature voltage of the direct current motor of the variable frequency transformer 9 acts on the direct current motor of the variable frequency transformer 9, the torque of the variable frequency transformer 9 is controlled by changing the driving torque of the variable frequency transformer 9, further the frequency of the rotor side of the variable frequency transformer 9 is changed, and finally the frequency of the three-phase permanent magnet synchronous motor 10 is changed.
The method comprises the following steps:
s1, acquiring an indoor temperature value, a temperature set value of a remote controller and a controller parameter; the controller parameters include: a proportionality coefficient of the torque controller and an integral coefficient of the torque controller;
s2, calculating according to a first preset formula based on the temperature set value and the indoor temperature value to obtain a temperature deviation value;
s3, determining a target refrigeration mode of the three-phase direct-current variable frequency air conditioner according to the temperature deviation value;
in an alternative embodiment, the cooling mode includes: a rapid cooling mode, a general cooling mode and an energy-saving cooling mode; the step S3 includes:
s31, judging whether the temperature deviation value is larger than a first preset temperature threshold value or not; if so, the three-phase direct-current variable frequency air conditioner enters the rapid refrigeration mode; if not, the step S32 is carried out;
s32, judging whether the temperature deviation value is larger than a second preset temperature threshold value or not; if so, the three-phase direct-current variable frequency air conditioner enters the general refrigeration mode; and if not, the three-phase direct-current variable frequency air conditioner enters the energy-saving refrigeration mode.
In practical applications, the first preset temperature threshold is usually 3 degrees celsius, and the second preset temperature threshold is usually 1 degree celsius.
S4, adjusting the real-time torque of the variable frequency transformer to a driving torque set value corresponding to the target refrigeration mode;
in an optional embodiment, the controller parameters further comprise: the proportional coefficient of the first temperature difference controller, the integral coefficient of the first temperature difference controller, the proportional coefficient of the second temperature difference controller, the integral coefficient of the second temperature difference controller, the proportional coefficient of the third temperature difference controller and the integral coefficient of the third temperature difference controller; the step S4 includes:
when the target refrigeration mode is the quick refrigeration mode, adjusting the given driving torque value to be the given driving torque value calculated according to a second preset formula on the basis of the proportionality coefficient of the first temperature difference controller and the integral coefficient of the first temperature difference controller;
when the target refrigeration mode is the general refrigeration mode, adjusting the given driving torque value to be the given driving torque value calculated according to a third preset formula on the basis of the proportionality coefficient of the second temperature difference controller and the integral coefficient of the second temperature difference controller;
and when the target refrigeration mode is the energy-saving refrigeration mode, adjusting the driving torque set value to be a driving torque set value calculated according to a fourth preset formula on the basis of the proportionality coefficient of the third temperature difference controller and the integral coefficient of the third temperature difference controller.
S5, calculating the armature voltage of the direct current motor in the variable frequency transformer according to a fifth preset formula based on the driving torque set value, the proportional coefficient of the torque controller and the integral coefficient of the torque controller to obtain a target armature voltage;
and S6, processing the target armature voltage by using a pulse width modulation module to obtain a switch control signal for controlling the thyristor rectifier bridge, inputting the switch control signal into the controller, and returning to execute the step S1.
In the embodiment of the invention, the armature voltage of the direct current motor of the variable frequency transformer is processed by the pulse width modulation module to obtain the switch control signal of the thyristor rectifier bridge, and the switch control signal is input into the controller, thereby realizing the frequency conversion characteristic of the three-phase permanent magnet synchronous motor.
Specifically, the first preset formula is as follows:
ΔT＝T * -T
the second preset formula is as follows:
Figure BDA0003227369430000091
the third preset formula is as follows:
Figure BDA0003227369430000092
the fourth preset formula is as follows:
Figure BDA0003227369430000093
the fifth preset formula is as follows:
Figure BDA0003227369430000094
wherein, delta T is a temperature deviation value T * Is the temperature set value of the remote controller, T is the indoor temperature value, s is the Laplace operator,
Figure BDA0003227369430000095
set value for the drive torque of a variable frequency transformer, K p1 Is the proportionality coefficient of the first temperature difference controller, K i1 Is an integral coefficient, T, of the first temperature difference controller 1 Is a first predetermined temperature threshold, K p2 Is the proportionality coefficient of the second temperature difference controller, K i2 Is the integral coefficient, T, of the second temperature difference controller 2 Is a second predetermined temperature threshold, K p3 Is the proportionality coefficient of the third temperature difference controller, K i3 Is the integral coefficient, T, of the third temperature difference controller 3 Is a third pre-set temperature threshold value,
Figure BDA0003227369430000096
is the armature voltage of the DC motor, K p4 As a proportionality coefficient of the torque controller, K i4 Is an integral coefficient of a torque controller, T dc Is the real-time torque of the variable frequency transformer.
In the embodiment of the invention, an indoor temperature value, a temperature set value of a remote controller and a controller parameter are obtained through S1; the controller parameters include: a proportionality coefficient for the torque controller and an integral coefficient for the torque controller; s2, calculating according to a first preset formula based on the temperature set value and the indoor temperature value to obtain a temperature deviation value; s3, determining a target refrigeration mode of the three-phase direct-current variable frequency air conditioner according to the temperature deviation value; s4, adjusting the real-time torque of the variable frequency transformer to a driving torque set value corresponding to the target refrigeration mode; s5, calculating the armature voltage of the direct current motor in the variable frequency transformer according to a fifth preset formula based on the driving torque set value, the proportional coefficient of the torque controller and the integral coefficient of the torque controller to obtain a target armature voltage; and S6, processing the target armature voltage by using a pulse width modulation module to obtain a switch control signal for controlling the thyristor rectifier bridge, inputting the switch control signal into the controller, and returning to execute the step S1. The variable frequency transformer is adopted as the frequency converter, the electric energy conversion link of the frequency converter is simplified from the traditional 'AC-DC-AC' to 'AC-AC', the first-stage electric energy conversion link is reduced, the electric energy loss is reduced, and the energy conversion efficiency is improved. Meanwhile, the variable frequency transformer does not generate harmonic waves, the thyristor rectifier bridge can carry out controllable rectification, the generated harmonic waves are greatly reduced, and the electric energy quality of a grid-connected point is obviously improved. In addition, the cost of the variable frequency transformer is much lower than that of a fully-controlled power electronic device, and the manufacturing cost of a three-phase direct-current variable frequency air conditioner product is greatly reduced. Finally, the three-phase direct current variable frequency air conditioner with the structure is simple to control, only the torque of the variable frequency transformer is needed to carry out closed loop adjustment, and torque pulsation cannot be generated.
Referring to fig. 3, a block diagram of a control device of a three-phase dc inverter air conditioner according to an embodiment of the present invention is shown, where the device includes:
an obtaining module 401, configured to obtain an indoor temperature value, a temperature setting value of a remote controller, and a controller parameter; the controller parameters include: a proportionality coefficient of the torque controller and an integral coefficient of the torque controller;
a temperature deviation value determining module 402, configured to calculate according to a first preset formula based on the temperature setting value and the indoor temperature value, to obtain a temperature deviation value;
a refrigeration mode determining module 403, configured to determine a target refrigeration mode of the three-phase direct-current variable frequency air conditioner according to the magnitude of the temperature deviation value;
a driving torque set value determining module 404, configured to adjust a real-time torque of the variable frequency transformer to a driving torque set value corresponding to the target cooling mode;
a target armature voltage determining module 405, configured to calculate, based on the driving torque given value, the proportional coefficient of the torque controller, and the integral coefficient of the torque controller, an armature voltage of a dc motor in the variable frequency transformer according to a fifth preset formula, so as to obtain a target armature voltage;
and the control module 406 is configured to process the target armature voltage by using the pulse width modulation module to obtain a switching control signal for controlling the thyristor rectifier bridge, input the switching control signal to the controller, and return to execute the obtaining module.
In an alternative embodiment, the cooling mode includes: a rapid cooling mode, a general cooling mode and an energy-saving cooling mode; the cooling mode determination module 403 includes:
the first judgment submodule is used for judging whether the temperature deviation value is larger than a first preset temperature threshold value or not; if so, the three-phase direct-current variable frequency air conditioner enters the rapid refrigeration mode; if not, executing a second judgment submodule;
the second judgment submodule is used for judging whether the temperature deviation value is larger than a second preset temperature threshold value or not; if so, the three-phase direct-current variable frequency air conditioner enters the general refrigeration mode; and if not, the three-phase direct-current variable frequency air conditioner enters the energy-saving refrigeration mode.
In an optional embodiment, the controller parameters further comprise: the proportional coefficient of the first temperature difference controller, the integral coefficient of the first temperature difference controller, the proportional coefficient of the second temperature difference controller, the integral coefficient of the second temperature difference controller, the proportional coefficient of the third temperature difference controller and the integral coefficient of the third temperature difference controller; the drive torque setpoint determination module 404 includes:
the first adjusting sub-module is used for adjusting the driving torque given value to be a driving torque given value calculated according to a second preset formula on the basis of a proportionality coefficient of the first temperature difference controller and an integral coefficient of the first temperature difference controller when the target refrigeration mode is the quick refrigeration mode;
the second adjusting submodule is used for adjusting the driving torque given value to be a driving torque given value calculated according to a third preset formula on the basis of the proportional coefficient of the second temperature difference controller and the integral coefficient of the second temperature difference controller when the target refrigeration mode is the general refrigeration mode;
and the third adjusting submodule is used for adjusting the driving torque given value to be the driving torque given value calculated according to a fourth preset formula on the basis of the proportionality coefficient of the third temperature difference controller and the integral coefficient of the third temperature difference controller when the target refrigeration mode is the energy-saving refrigeration mode.
In an alternative embodiment, the first preset formula is:
ΔT＝T * -T
the second preset formula is as follows:
Figure BDA0003227369430000111
the third preset formula is as follows:
Figure BDA0003227369430000112
the fourth preset formula is as follows:
Figure BDA0003227369430000113
the fifth preset formula is as follows:
Figure BDA0003227369430000114
wherein, delta T is a temperature deviation value T * Is the temperature set value of the remote controller, T is the indoor temperature value, s is the Laplace operator,
Figure BDA0003227369430000115
set value, K, for the drive torque of a variable frequency transformer p1 Is the proportionality coefficient of the first temperature difference controller, K i1 Is an integral coefficient, T, of the first temperature difference controller 1 Is a first predetermined temperature threshold, K p2 Is the proportionality coefficient of the second temperature difference controller, K i2 Is the integral coefficient, T, of the second temperature difference controller 2 Is a second predetermined temperature threshold, K p3 Is the proportionality coefficient of the third temperature difference controller, K i3 Is the integral coefficient, T, of the third temperature difference controller 3 Is the third pre-set temperature threshold value,
Figure BDA0003227369430000121
is the armature voltage of the DC motor, K p4 As a proportionality coefficient of the torque controller, K i4 Is an integral coefficient of a torque controller, T dc Is the real-time torque of the variable frequency transformer.
The embodiment of the present invention further provides an electronic device, which includes a memory and a processor, where the memory stores an analyzer program, and when the analyzer program is executed by the processor, the processor executes the steps of the control method for a three-phase dc inverter air conditioner according to any one of the above embodiments.
The embodiment of the invention also provides a readable storage medium of the analyzer, wherein an analyzer program is stored on the readable storage medium, and when the analyzer program is executed by the processor, the control method of the three-phase direct-current variable-frequency air conditioner according to any one of the embodiments is realized.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the method, apparatus, electronic device and storage medium disclosed in the present application may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium readable by an analyzer. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a readable storage medium and includes several instructions for enabling an analyzer (which may be a personal analyzer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned readable storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (4)

1. A control method of a three-phase direct current variable frequency air conditioner is characterized by being applied to the three-phase direct current variable frequency air conditioner; the three-phase direct current variable frequency air conditioner comprises: the system comprises a thyristor rectifier bridge, a direct current capacitor, a variable frequency transformer, a three-phase permanent magnet synchronous motor and a controller; the method comprises the following steps:
s1, acquiring an indoor temperature value, a temperature set value of a remote controller and a controller parameter; the controller parameters include: a proportionality coefficient of the torque controller, an integral coefficient of the torque controller, a proportionality coefficient of the first temperature difference controller, an integral coefficient of the first temperature difference controller, a proportionality coefficient of the second temperature difference controller, an integral coefficient of the second temperature difference controller, a proportionality coefficient of the third temperature difference controller and an integral coefficient of the third temperature difference controller;
s2, calculating according to a first preset formula based on the temperature set value and the indoor temperature value to obtain a temperature deviation value;
s3, determining a target refrigeration mode of the three-phase direct-current variable frequency air conditioner according to the temperature deviation value; the cooling mode includes: a rapid cooling mode, a general cooling mode and an energy-saving cooling mode;
s4, adjusting the real-time torque of the variable frequency transformer to a driving torque set value corresponding to the target refrigeration mode;
s5, calculating the armature voltage of the direct current motor in the variable frequency transformer according to a fifth preset formula based on the driving torque given value, the proportional coefficient of the torque controller and the integral coefficient of the torque controller to obtain a target armature voltage;
s6, processing the target armature voltage by using a pulse width modulation module to obtain a switch control signal for controlling a thyristor rectifier bridge, inputting the switch control signal into the controller, and returning to execute the step S1;
the step S3 includes:
s31, judging whether the temperature deviation value is larger than a first preset temperature threshold value or not; if so, the three-phase direct-current variable frequency air conditioner enters the rapid refrigeration mode; if not, the step S32 is carried out;
s32, judging whether the temperature deviation value is larger than a second preset temperature threshold value or not; if so, the three-phase direct-current variable frequency air conditioner enters the general refrigeration mode; if not, the three-phase direct-current variable frequency air conditioner enters the energy-saving refrigeration mode;
the step S4 includes:
when the target refrigeration mode is the quick refrigeration mode, adjusting the given driving torque value to be the given driving torque value calculated according to a second preset formula on the basis of the proportionality coefficient of the first temperature difference controller and the integral coefficient of the first temperature difference controller;
when the target refrigeration mode is the general refrigeration mode, adjusting the given driving torque value to be the given driving torque value calculated according to a third preset formula on the basis of the proportionality coefficient of the second temperature difference controller and the integral coefficient of the second temperature difference controller;
when the target refrigeration mode is the energy-saving refrigeration mode, adjusting the given driving torque value to be the given driving torque value calculated according to a fourth preset formula on the basis of the proportionality coefficient of the third temperature difference controller and the integral coefficient of the third temperature difference controller;
the first preset formula is as follows:
ΔT＝T * -T
the second preset formula is as follows:
Figure FDA0003890970530000021
the third preset formula is as follows:
Figure FDA0003890970530000022
the fourth preset formula is as follows:
Figure FDA0003890970530000023
the fifth preset formula is as follows:
Figure FDA0003890970530000024
wherein, K p4 As a proportionality coefficient of the torque controller, K i4 Is an integral coefficient of a torque controller, T dc Is the real-time torque of the variable frequency transformer,
Figure FDA0003890970530000025
is the armature voltage of the direct current motor,
Figure FDA0003890970530000026
is a given value of the driving torque of the variable frequency transformer, and Delta T is a temperature deviation value T * Is the temperature set value of the remote controller, T is the indoor temperature value, s is the Laplace operator, K p1 Is the proportionality coefficient of the first temperature difference controller, K i1 Is an integral coefficient, T, of the first temperature difference controller 1 Is a first preset temperatureThreshold value, K p2 Is the proportionality coefficient of the second temperature difference controller, K i2 Is the integral coefficient, T, of the second temperature difference controller 2 Is a second predetermined temperature threshold, K p3 Is the proportionality coefficient of the third temperature difference controller, K i3 Is the integral coefficient of the third temperature difference controller.
2. A control device of a three-phase direct current variable frequency air conditioner is characterized by being applied to the three-phase direct current variable frequency air conditioner; the three-phase direct current variable frequency air conditioner comprises: the system comprises a thyristor rectifier bridge, a direct current capacitor, a variable frequency transformer, a three-phase permanent magnet synchronous motor and a controller; the device comprises:
the acquisition module is used for acquiring an indoor temperature value, a temperature set value of the remote controller and a controller parameter; the controller parameters include: a proportionality coefficient of the torque controller, an integral coefficient of the torque controller, a proportionality coefficient of the first temperature difference controller, an integral coefficient of the first temperature difference controller, a proportionality coefficient of the second temperature difference controller, an integral coefficient of the second temperature difference controller, a proportionality coefficient of the third temperature difference controller and an integral coefficient of the third temperature difference controller;
the temperature deviation value determining module is used for calculating according to a first preset formula based on the temperature set value and the indoor temperature value to obtain a temperature deviation value;
the refrigeration mode determining module is used for determining a target refrigeration mode of the three-phase direct current variable frequency air conditioner according to the temperature deviation value; the cooling mode includes: a rapid cooling mode, a general cooling mode and an energy-saving cooling mode;
the driving torque given value determining module is used for adjusting the real-time torque of the variable frequency transformer to a driving torque given value corresponding to the target refrigeration mode;
the target armature voltage determining module is used for calculating the armature voltage of the direct current motor in the variable frequency transformer according to a fifth preset formula based on the driving torque given value, the proportional coefficient of the torque controller and the integral coefficient of the torque controller to obtain the target armature voltage;
the control module is used for processing the target armature voltage by using the pulse width modulation module to obtain a switch control signal for controlling the thyristor rectifier bridge, inputting the switch control signal into the controller and returning to the execution of the acquisition module;
the cooling mode determination module includes:
the first judgment submodule is used for judging whether the temperature deviation value is larger than a first preset temperature threshold value or not; if so, the three-phase direct-current variable frequency air conditioner enters the rapid refrigeration mode; if not, executing a second judgment sub-module;
the second judgment submodule is used for judging whether the temperature deviation value is larger than a second preset temperature threshold value or not; if so, the three-phase direct-current variable frequency air conditioner enters the general refrigeration mode; if not, the three-phase direct-current variable frequency air conditioner enters the energy-saving refrigeration mode;
the drive torque set point determination module includes:
the first adjusting submodule is used for adjusting the driving torque given value to be a driving torque given value calculated according to a second preset formula on the basis of a proportionality coefficient of the first temperature difference controller and an integral coefficient of the first temperature difference controller when the target refrigeration mode is the quick refrigeration mode;
the second adjusting submodule is used for adjusting the driving torque given value to be a driving torque given value calculated according to a third preset formula on the basis of the proportionality coefficient of the second temperature difference controller and the integral coefficient of the second temperature difference controller when the target refrigeration mode is the general refrigeration mode;
a third adjusting submodule, configured to adjust the driving torque given value to a driving torque given value calculated according to a fourth preset formula based on a proportionality coefficient of the third temperature difference controller and an integral coefficient of the third temperature difference controller when the target refrigeration mode is the energy-saving refrigeration mode;
the first preset formula is as follows:
ΔT＝T * -T
the second preset formula is as follows:
Figure FDA0003890970530000041
the third preset formula is as follows:
Figure FDA0003890970530000042
the fourth preset formula is as follows:
Figure FDA0003890970530000043
the fifth preset formula is as follows:
Figure FDA0003890970530000044
wherein, K p4 As a scaling factor of the torque controller, K i4 Is an integral coefficient of a torque controller, T dc Is the real-time torque of the variable frequency transformer,
Figure FDA0003890970530000045
is the armature voltage of the direct current motor,
Figure FDA0003890970530000046
is a given value of the driving torque of the variable frequency transformer, and Delta T is a temperature deviation value T * Is the temperature set value of the remote controller, T is the indoor temperature value, s is the Laplace operator, K p1 Is the proportionality coefficient of the first temperature difference controller, K i1 Is an integral coefficient, T, of the first temperature difference controller 1 Is a first predetermined temperature threshold, K p2 Is the proportionality coefficient of the second temperature difference controller, K i2 Is the integral coefficient, T, of the second temperature difference controller 2 Is a second predetermined temperature threshold, K p3 Is the proportionality coefficient of the third temperature difference controller, K i3 Is the third temperatureIntegral coefficient of the difference controller.
3. An electronic device comprising a processor and a memory, the memory storing analysis machine readable instructions that, when executed by the processor, perform the method of claim 1.
4. A storage medium on which an analyzer program is stored, which when executed by a processor performs the method of claim 1.
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