CN114704934A - Method and device for controlling direct current air conditioner and direct current air conditioner - Google Patents
Method and device for controlling direct current air conditioner and direct current air conditioner Download PDFInfo
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- CN114704934A CN114704934A CN202210152770.2A CN202210152770A CN114704934A CN 114704934 A CN114704934 A CN 114704934A CN 202210152770 A CN202210152770 A CN 202210152770A CN 114704934 A CN114704934 A CN 114704934A
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- 238000001816 cooling Methods 0.000 description 8
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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
- F24F11/62—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
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
Abstract
The application relates to the technical field of intelligent household appliances, and discloses a method for controlling a direct-current air conditioner, which comprises the following steps: determining whether the frequency-increasing limiting condition is met or not according to the command voltage and the bus voltage of the compressor motor; under the condition that the frequency-increasing limiting condition is met, the start and stop of the flux weakening function are controlled according to the residual electric quantity value of the photovoltaic energy storage system, so that the utilization rate of electric energy in the photovoltaic energy storage system is improved. The current temperature adjustment specific situation is judged according to the residual electric quantity value of the photovoltaic energy storage system before the current flux weakening function is started, and the flux weakening function is specifically controlled to be started and stopped according to the actual situation of each user. The method adapts to the trend of direct current power generation, improves the accuracy of starting and stopping the flux weakening function of the direct current air conditioner, and fully utilizes the electric energy stored in the photovoltaic energy storage system. The application also discloses a device and a direct current air conditioner for controlling the direct current air conditioner.
Description
Technical Field
The present application relates to the field of intelligent household electrical appliance technologies, and for example, to a method and an apparatus for controlling a dc air conditioner, and a dc air conditioner.
Background
At present, with the implementation of the targets of "carbon peak reaching" and "carbon neutralization", new energy development steps into a rapid development period, the green energy and the direct-current development of a power grid promote the research and development of household power direct-current technology, and direct-current household appliances increasingly become a development trend. However, due to instability of the green power source, how the dc home appliance is adapted to the green power source with dc characteristics and the distributed dc power grid becomes a problem to be solved urgently.
The prior art discloses that under the condition that the bus voltage reaches the frequency-raising limit, in order to ensure the cooling or heating effect, the air conditioner will enter the field weakening control to continue to raise the operating frequency of the compressor.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
due to the instability generated by the power supply of the green power supply, the situation that the voltage of a house is lower than the typical value 375V exists, the bus voltage is extremely unstable, the direct current air conditioner frequently reaches the frequency-raising limit, and therefore the direct current air conditioner enters the weak magnetic control situation, the accuracy of the starting and stopping weak magnetic function of the direct current air conditioner is poor, and the electric energy stored in the photovoltaic energy storage system cannot be well utilized.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a method and a device for controlling a direct current air conditioner and the direct current air conditioner, so as to adapt to the trend of direct current power generation, improve the accuracy of starting and stopping a flux weakening function of the direct current air conditioner and fully utilize electric energy stored in a photovoltaic energy storage system.
In some embodiments, the above method comprises: determining whether the frequency-increasing limiting condition is met or not according to the command voltage and the bus voltage of the compressor motor; under the condition that the frequency-increasing limiting condition is met, the start and stop of the flux weakening function are controlled according to the residual electric quantity value of the photovoltaic energy storage system, so that the utilization rate of electric energy in the photovoltaic energy storage system is improved.
In some embodiments, the apparatus comprises: a processor and a memory storing program instructions, the processor being configured to, upon execution of the program instructions, perform the above-described method for controlling a dc air conditioner.
In some embodiments, the above dc air conditioner includes: the device for controlling the direct current air conditioner is disclosed.
The method and the device for controlling the direct current air conditioner and the direct current air conditioner provided by the embodiment of the disclosure can realize the following technical effects:
whether the frequency-increasing limiting condition is met is determined according to the instruction voltage of the compressor motor and the bus voltage, and the start and stop of the flux weakening function are controlled according to the residual electric quantity value of the photovoltaic energy storage system under the condition that the frequency-increasing limiting condition is met, so that the utilization rate of electric energy in the photovoltaic energy storage system is improved. The current temperature adjustment specific situation is judged according to the residual electric quantity value of the photovoltaic energy storage system before the current flux weakening function is started, and the flux weakening function is specifically controlled to be started and stopped according to the actual situation of each user. The method adapts to the trend of direct current power generation, improves the accuracy of starting and stopping the flux weakening function of the direct current air conditioner, and fully utilizes the electric energy stored in the photovoltaic energy storage system.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
fig. 1 is a schematic diagram of a method for controlling a dc air conditioner according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of another method for controlling a DC air conditioner provided by an embodiment of the present disclosure;
fig. 3 is a schematic diagram of another method for controlling a dc air conditioner according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of another method for controlling a dc air conditioner according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of another method for controlling a dc air conditioner according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of another method for controlling a dc air conditioner according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of an apparatus for controlling a dc air conditioner according to an embodiment of the present disclosure.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged as appropriate for the embodiments of the disclosure described herein. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The term "plurality" means two or more, unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
The term "correspond" may refer to an association or binding relationship, and a corresponds to B refers to an association or binding relationship between a and B.
In the embodiment of the disclosure, the intelligent household appliance is a household appliance formed by introducing a microprocessor, a sensor technology and a network communication technology into the household appliance, and has the characteristics of intelligent control, intelligent sensing and intelligent application, the operation process of the intelligent household appliance usually depends on the application and processing of modern technologies such as internet of things, internet and an electronic chip, for example, the intelligent household appliance can realize the remote control and management of a user on the intelligent household appliance by connecting the intelligent household appliance with the electronic device.
In the disclosed embodiment, the terminal device is an electronic device with a wireless connection function, and the terminal device can be in communication connection with the above intelligent household appliance by connecting to the internet, or can be in communication connection with the above intelligent household appliance directly in a bluetooth mode, a wifi mode, or the like. In some embodiments, the terminal device is, for example, a mobile device, a computer, a vehicle-mounted device built in a hovercar, or the like, or any combination thereof. The mobile device may include, for example, a cell phone, a smart home device, a wearable device, a smart mobile device, a virtual reality device, or the like, or any combination thereof, wherein the wearable device includes, for example: smart watches, smart bracelets, pedometers, and the like.
In the existing control technology of the permanent magnet synchronous compressor of the variable frequency air conditioner, the command voltage of a motor is in positive correlation with the absolute value of direct-axis voltage and the absolute value of quadrature-axis voltage respectively, but the command voltage cannot be increased all the time due to the limitation of hardware. When the bus voltage meets the frequency-increasing limiting condition, in order to continuously increase the running speed of the motor, if the direct-axis current can be increased towards the negative direction, the running speed of the motor can be continuously increased, and the effect of increasing the running speed of the motor is achieved. The current can generate a magnetic field, and the direct-axis current introduced into the negative phase generates a magnetic field of the negative phase, namely, the counter electromotive force constant of the press is reduced, namely, the effect of the magnetic field is weakened, so that the technology is called weak magnetic control in the industry.
Referring to fig. 1, an embodiment of the present disclosure provides a method for controlling a dc air conditioner, including:
and S01, the direct current air conditioner determines whether the frequency increasing limiting condition is met according to the command voltage of the compressor motor and the bus voltage.
And S02, controlling the start and stop of the flux weakening function by the direct current air conditioner according to the residual electric quantity value of the photovoltaic energy storage system under the condition that the direct current air conditioner meets the frequency increasing limiting condition so as to improve the utilization rate of electric energy in the photovoltaic energy storage system.
By adopting the method for controlling the direct current air conditioner, whether the frequency-increasing limiting condition is met can be determined according to the instruction voltage of the compressor motor and the bus voltage, and the start and stop of the flux weakening function are controlled according to the residual electric quantity value of the photovoltaic energy storage system under the condition that the frequency-increasing limiting condition is met, so that the utilization rate of electric energy in the photovoltaic energy storage system is improved. The specific condition of current temperature regulation is judged according to the residual electric quantity value of the photovoltaic energy storage system before the weak magnetic function is entered, and the weak magnetic function is specifically controlled to be started and stopped according to the actual condition of each user. The method adapts to the trend of direct current power generation, improves the accuracy of starting and stopping the flux weakening function of the direct current air conditioner, and fully utilizes the electric energy stored in the photovoltaic energy storage system.
Optionally, the determining, by the dc air conditioner, whether the up-conversion limiting condition is satisfied according to the command voltage of the compressor motor and the bus voltage includes: the direct current air conditioner calculates the voltage ratio of the effective value of the command voltage of the compressor motor to the bus voltage; and the direct current air conditioner determines whether the frequency-increasing limiting condition is met or not according to the voltage ratio.
Therefore, the accuracy of start-stop flux weakening control of the direct current air conditioner can be better improved. The voltage ratio of the command voltage of the motor to the bus voltage can represent the current command voltage to the hardware limit degree. Therefore, whether the compressor can continue to increase the frequency or not can be judged according to the voltage ratio, corresponding operation is executed according to the judgment result, and the accuracy of entering flux weakening control is improved.
Optionally, the determining, by the dc air conditioner, whether the frequency-increasing limitation condition is met according to the voltage ratio includes: under the condition that the voltage ratio is greater than or equal to the ratio threshold, the direct-current air conditioner determines that the frequency-increasing limiting condition is met; and under the condition that the voltage ratio is smaller than the ratio threshold, the direct current air conditioner determines that the frequency increasing limiting condition is not met.
Therefore, the starting and stopping time of the field weakening control can be better determined. When the voltage ratio of the air conditioner is larger than or equal to the ratio threshold, the fact that the effective value of the command voltage is far larger than the bus voltage at the moment is shown, and almost no margin exists in the frequency boosting of the compressor is confirmed, and the frequency boosting limiting condition is met. And under the condition that the voltage ratio is smaller than the ratio threshold, the effective value of the command voltage is far smaller than the bus voltage at the moment, and the compressor has margin for raising the frequency, so that the condition of raising the frequency is determined not to be met.
Referring to fig. 2, another method for controlling a dc air conditioner according to an embodiment of the present disclosure includes:
and S01, the direct current air conditioner determines whether the frequency increasing limiting condition is met according to the command voltage of the compressor motor and the bus voltage.
And S021, controlling the flux weakening function to be started by the direct current air conditioner under the condition that the residual electric quantity value is greater than the electric quantity threshold value so as to improve the running frequency of the compressor.
And S022, controlling the start and stop of the flux weakening function by the direct current air conditioner according to the relevant parameter information under the condition that the residual electric quantity value is less than or equal to the electric quantity threshold value.
By adopting the method for controlling the direct current air conditioner provided by the embodiment of the disclosure, whether the limitation condition of frequency rising is met can be judged according to the residual electric quantity value of the energy storage system. And under the condition that the residual electric quantity value is less than or equal to the electric quantity threshold value, judging that the temperature regulation requirement of the direct current air conditioner cannot be met when the compressor runs at the highest running frequency. And controlling the start and stop of the flux weakening function by the direct current air conditioner according to the related parameter information so that the operating frequency of the compressor meets the temperature regulation requirement of the direct current air conditioner.
Referring to fig. 3, another method for controlling a dc air conditioner according to an embodiment of the present disclosure includes:
and S01, the direct current air conditioner determines whether the frequency increasing limiting condition is met according to the command voltage of the compressor motor and the bus voltage.
And S021, controlling the flux weakening function to be started by the direct current air conditioner under the condition that the residual electric quantity value is greater than the electric quantity threshold value so as to improve the running frequency of the compressor.
And S031, under the condition that the residual electric quantity value is less than or equal to the electric quantity threshold value, the direct current air conditioner determines the target operation frequency of the compressor according to the outdoor environment temperature and the time parameter information.
And S032, controlling the start and stop of the flux weakening function by the direct current air conditioner according to the target operation frequency and the temperature value set by the user.
By adopting the method for controlling the direct current air conditioner, provided by the embodiment of the disclosure, the target operation frequency of the compressor can be determined according to the outdoor environment temperature and the time parameter information under the condition that the compressor is judged to operate at the highest operation frequency and the temperature regulation requirement of the direct current air conditioner cannot be met. Therefore, the start and stop of the flux weakening function are determined according to the target running frequency. For example, when the remaining capacity of the photovoltaic energy storage system is greater than 60%, the flux weakening function is turned on to continuously increase the frequency of the compressor, so as to meet the cooling and heating capacity required by the user. And acquiring the outdoor environment temperature under the condition that the residual capacity of the photovoltaic energy storage system is less than or equal to 60% and more than 30%. And when the outdoor environment temperature is higher than 27 ℃, the air conditioner is determined to operate in a cooling mode, and when the outdoor environment temperature is lower than 18 ℃, the air conditioner is determined to operate in a heating mode. At this time, the current time is acquired. And judging the time for which the energy storage system supplies power to the direct-current air conditioner at night according to the current time so as to determine the operating frequency of the compressor, and judging whether the flux weakening function needs to be started or not by combining with a temperature value set by a user.
Optionally, the controlling, by the dc air conditioner, the start and stop of the flux weakening function according to the target operating frequency and the user-set temperature value includes: the direct current air conditioner determines the temperature difference between the current indoor temperature and the temperature set by the user; and under the condition that the temperature difference value is greater than or equal to the temperature difference threshold value, starting a flux weakening function of the direct current air conditioner so as to improve the running frequency of the compressor.
Therefore, the starting and stopping time of the field weakening control can be better judged. Specifically, the outdoor environment temperature is obtained under the condition that the residual capacity of the photovoltaic energy storage system is less than or equal to 60% and more than 30%. When the environment temperature is higher than 27 ℃ and the current time is earlier than 2 am, the time for the energy storage system to supply power to the direct current air conditioner is considered to be longer at night, and the start and stop of the weak magnetic state are controlled according to the temperature difference value between the indoor environment temperature and the temperature set by the user. For example, when the temperature difference value is greater than 6 ℃, the power grid is connected to supply power to the air conditioner to control the air conditioner to start the flux weakening function, so that the frequency of the compressor is continuously increased to meet the refrigerating capacity required by a user. And under the condition that the temperature difference value is greater than 3 ℃ and less than or equal to 6 ℃, controlling the direct current air conditioner to operate at the highest frequency without starting the flux weakening function. And under the condition that the temperature difference value is less than or equal to 3 ℃, controlling the direct current air conditioner not to start the flux weakening control, and controlling the frequency of the compressor to operate in a frequency reduction mode. That is, the compressor is operated according to the down-conversion AHz on the basis of the highest frequency without the flux weakening function being turned on, or the B% reduction on the basis of the highest frequency without the flux weakening function being turned on. When the ambient temperature is higher than 27 ℃ and the current time is later than 2 am, the time for the energy storage system to supply power to the direct current air conditioner at night is considered to be short, and the current residual electric quantity is sufficient. The air conditioner is controlled to start the flux weakening function, so that the frequency of the press is continuously increased to meet the refrigerating capacity required by a user. When the environmental temperature is lower than 18 ℃ and the current time is 4 hours earlier than the morning, the air conditioner is considered to run in a heating mode, the time for the energy storage system to supply power to the direct current air conditioner is longer at night, and the start and stop of the weak magnetic state are controlled according to the temperature difference value between the indoor environmental temperature and the temperature set by the user. For example, when the temperature difference value is greater than 6 ℃, the power grid is connected to supply power to the air conditioner to control the opening of the flux weakening function, so that the frequency of the compressor is continuously increased to meet the heating quantity required by a user. And under the condition that the temperature difference value is greater than 3 ℃ and less than or equal to 6 ℃, controlling the direct current air conditioner to operate at the highest frequency without starting the flux weakening function. And under the condition that the temperature difference value is less than or equal to 3 ℃, controlling the direct current air conditioner not to start the flux weakening control, and controlling the frequency of the compressor to operate in a frequency reduction mode. That is, the compressor is operated according to the down-conversion CHz on the basis of the highest frequency without the flux weakening function being turned on, or the D% reduction on the basis of the highest frequency without the flux weakening function being turned on. When the ambient temperature is less than 18 ℃ and the current time is 4 hours later than morning, the time for the energy storage system to supply power to the direct current air conditioner at night is considered to be short, and the current residual electric quantity is sufficient. The air conditioner is controlled to start the flux weakening function, so that the frequency of the press is continuously increased to meet the heating quantity required by a user.
And acquiring the outdoor environment temperature under the condition that the residual capacity of the photovoltaic energy storage system is less than or equal to 30%. When the environment temperature is higher than 27 ℃ and the current time is earlier than 4 am, the time that the energy storage system needs to supply power to the direct current air conditioner at night is considered to be longer under the condition of low electric quantity, and the start and stop of the weak magnetic state are controlled according to the temperature difference value between the indoor environment temperature and the temperature set by the user. For example, when the temperature difference value is greater than 3 ℃, the power grid is connected to supply power to the air conditioner to control the air conditioner to start the flux weakening function, so that the frequency of the compressor is continuously increased to meet the refrigerating capacity required by a user. And under the condition that the temperature difference value is less than or equal to 3 ℃, controlling the direct current air conditioner not to start the flux weakening control, and controlling the frequency of the compressor to operate in a frequency reduction mode. That is, the compressor is operated according to the down-conversion AHz on the basis of the highest frequency without the flux weakening function being turned on, or the B% reduction on the basis of the highest frequency without the flux weakening function being turned on. When the environmental temperature is higher than 27 ℃ and the current time is later than 4 am, the time that the energy storage system needs to supply power to the direct current air conditioner at night is considered to be short, and the start and stop of the weak magnetic state are controlled according to the temperature difference value between the indoor environmental temperature and the temperature set by the user due to insufficient electric quantity. For example, in the case where the temperature difference value is greater than 3 ℃, the dc air conditioner is controlled to operate at the highest frequency at which the magnetic weakening function is not turned on. And under the condition that the temperature difference value is less than or equal to 3 ℃, controlling the direct current air conditioner not to start the flux weakening control, and controlling the frequency of the compressor to operate in a frequency reduction mode. That is, the compressor is operated according to the down-conversion AHz on the basis of the highest frequency without the flux weakening function being turned on, or the B% reduction on the basis of the highest frequency without the flux weakening function being turned on. When the environmental temperature is lower than 18 ℃ and the current time is 6 hours earlier than the morning, the time that the energy storage system needs to supply power to the direct current air conditioner at night is considered to be longer under the condition of low electric quantity, and the start and stop of the weak magnetic state are controlled according to the temperature difference value between the indoor environmental temperature and the temperature set by the user. For example, when the temperature difference value is greater than 3 ℃, the power grid is connected to supply power to the air conditioner to control the opening of the flux weakening function, so that the frequency of the compressor is continuously increased to meet the heating quantity required by a user. And under the condition that the temperature difference value is less than or equal to 3 ℃, controlling the direct current air conditioner not to start the flux weakening control, and controlling the frequency of the compressor to operate in a frequency reduction mode. That is, the compressor is operated according to the down-conversion CHz on the basis of the highest frequency without the flux weakening function being turned on, or the D% reduction on the basis of the highest frequency without the flux weakening function being turned on. When the environmental temperature is less than 18 ℃ and the current time is later than 6 am, the time that the energy storage system needs to supply power to the direct current air conditioner at night is considered to be short, and the start and stop of the weak magnetic state are controlled according to the temperature difference value between the indoor environmental temperature and the temperature set by the user due to insufficient electric quantity. For example, in the case where the temperature difference value is greater than 3 ℃, the dc air conditioner is controlled to operate at the highest frequency at which the magnetic weakening function is not turned on. And under the condition that the temperature difference value is less than or equal to 3 ℃, controlling the direct current air conditioner not to start the flux weakening control, and controlling the frequency of the compressor to operate in a frequency reduction mode. That is, the compressor is operated according to the frequency-down CHz on the basis of the highest frequency without opening the flux weakening function, or the D% is reduced on the basis of the highest frequency without opening the flux weakening function.
Referring to fig. 4, another method for controlling a dc air conditioner according to an embodiment of the present disclosure includes:
and S01, the direct current air conditioner determines whether the frequency increasing limiting condition is met according to the command voltage of the compressor motor and the bus voltage.
And S021, controlling the flux weakening function to be started by the direct current air conditioner under the condition that the residual electric quantity value is greater than the electric quantity threshold value so as to improve the running frequency of the compressor.
And S041, under the condition that the residual electric quantity value is less than or equal to the electric quantity threshold value, the direct current air conditioner determines the target operation frequency of the compressor according to the outdoor environment temperature and the indoor personnel parameter information.
And S042, controlling the start and stop of the flux weakening function by the direct current air conditioner according to the target operation frequency and the temperature value set by the user.
By adopting the method for controlling the direct current air conditioner provided by the embodiment of the disclosure, the target operation frequency of the compressor can be determined according to the outdoor environment temperature and the indoor personnel parameter information under the condition that the compressor is operated at the highest operation frequency and the temperature regulation requirement of the direct current air conditioner cannot be met is judged. Therefore, the start and stop of the flux weakening function are determined according to the target running frequency. For example, when the remaining capacity of the photovoltaic energy storage system is greater than 60%, the flux weakening function is turned on to continuously increase the frequency of the compressor, so as to meet the cooling and heating capacity required by the user. And acquiring the outdoor environment temperature under the condition that the residual capacity of the photovoltaic energy storage system is less than or equal to 60% and more than 30%. And when the outdoor environment temperature is higher than 27 ℃, the air conditioner is determined to operate in a cooling mode, and when the outdoor environment temperature is lower than 18 ℃, the air conditioner is determined to operate in a heating mode. At this time, the presence or absence of a person in the current room is acquired. And judging the time for which the energy storage system needs to supply power to the direct current air conditioner at night according to the judgment result of the existence of personnel, so as to determine the operating frequency of the compressor, and judging whether the flux weakening function needs to be started or not by combining the temperature value set by a user.
Optionally, the controlling, by the dc air conditioner, the start and stop of the flux weakening function according to the target operating frequency and the user-set temperature value includes: the direct current air conditioner determines the temperature difference between the current indoor temperature and the temperature set by a user; and under the condition that the temperature difference value is greater than or equal to the temperature difference threshold value, starting a flux weakening function of the direct current air conditioner so as to improve the running frequency of the compressor.
Therefore, the starting and stopping time of the field weakening control can be better judged. Specifically, under the condition that the residual electric quantity of the photovoltaic energy storage system is more than 60%, if people exist in a room, the photovoltaic energy storage system is controlled to enter a flux weakening function, and the running frequency of the compressor is continuously increased to meet the refrigerating and heating quantity required by a user. If no person is in the room, the DC air conditioner is controlled to operate at the highest frequency without starting the flux weakening function.
And acquiring the outdoor environment temperature under the condition that the residual capacity of the photovoltaic energy storage system is less than or equal to 60% and more than 30%. And under the condition that the ambient temperature is higher than 27 ℃ and people exist in the room, calculating the temperature difference value between the indoor ambient temperature and the temperature set by the user. And under the condition that the temperature difference value is greater than or equal to 3 ℃, the weak magnetic function is started, so that the frequency of the press is continuously increased to meet the refrigerating capacity required by a user. And under the condition that the temperature difference value is less than 3 ℃, controlling the direct current air conditioner to operate at the highest frequency without starting the flux weakening function. And under the condition that the ambient temperature is greater than 27 ℃ and no people are in the room, calculating the temperature difference value between the indoor ambient temperature and the temperature set by the user. And under the condition that the temperature difference value is greater than or equal to 3 ℃, controlling the direct current air conditioner to operate at the highest frequency without starting the flux weakening function. And under the condition that the temperature difference value is less than 3 ℃, controlling the direct current air conditioner not to start the flux weakening control, and controlling the frequency of the compressor to operate in a frequency reduction mode. That is, the compressor is operated according to the down-conversion AHz on the basis of the highest frequency without the flux weakening function being turned on, or the B% reduction on the basis of the highest frequency without the flux weakening function being turned on.
And acquiring the outdoor environment temperature under the condition that the residual capacity of the photovoltaic energy storage system is less than or equal to 60% and more than 30%. And under the condition that the ambient temperature is less than 18 ℃ and people exist in the room, calculating the temperature difference value between the indoor ambient temperature and the temperature set by the user. And under the condition that the temperature difference value is greater than or equal to 3 ℃, the weak magnetic function is started, so that the frequency of the press is continuously increased to meet the heating quantity required by a user. And under the condition that the temperature difference value is less than 3 ℃, controlling the direct current air conditioner to operate at the highest frequency without starting the flux weakening function. And under the condition that the ambient temperature is less than 18 ℃ and no people exist indoors, calculating the temperature difference value between the indoor ambient temperature and the temperature set by the user. And under the condition that the temperature difference value is greater than or equal to 3 ℃, controlling the direct current air conditioner to operate at the highest frequency without starting the flux weakening function. And under the condition that the ambient temperature is less than 18 ℃ and no people exist indoors, calculating the temperature difference value between the indoor ambient temperature and the temperature set by the user. And under the condition that the temperature difference value is greater than or equal to 3 ℃, controlling the direct current air conditioner to operate at the highest frequency without starting the flux weakening function. And under the condition that the temperature difference value is less than 3 ℃, controlling the direct current air conditioner not to start the flux weakening control, and controlling the frequency of the compressor to operate in a frequency reduction mode. That is, the compressor is operated according to the frequency-down CHz on the basis of the highest frequency without opening the flux weakening function, or the D% is reduced on the basis of the highest frequency without opening the flux weakening function.
And under the condition that the residual electric quantity of the photovoltaic energy storage system is less than 30%, judging whether personnel exist indoors or not. Under the condition that someone is in the room, the power grid is connected to supply power to the air conditioner to control the opening of the flux weakening function, so that the frequency of the compressor is continuously increased to meet the refrigerating and heating quantity required by a user. And under the condition that no person is in the room, controlling the frequency of the compressor to perform down-frequency operation. For example, the operation is performed according to down-conversion AHz (in cooling mode) or CHz (in heating mode) on the basis of the highest frequency without turning on the magnetic weakening function, or, B% (in cooling mode) or D% (in heating mode) on the basis of the highest frequency without turning on the magnetic weakening function.
Referring to fig. 5, another method for controlling a dc air conditioner according to an embodiment of the present disclosure includes:
and S01, the direct current air conditioner determines whether the frequency increasing limiting condition is met according to the command voltage of the compressor motor and the bus voltage.
And S02, controlling the start and stop of the flux weakening function by the direct current air conditioner according to the residual electric quantity value of the photovoltaic energy storage system under the condition that the direct current air conditioner meets the frequency increasing limiting condition so as to improve the utilization rate of electric energy in the photovoltaic energy storage system.
And S05, under the condition that the air conditioner needs to perform self-cleaning, starting a flux weakening function by the direct current air conditioner so as to improve the running frequency of the compressor.
By adopting the method for controlling the direct current air conditioner, whether the flux weakening function is started or not can be judged according to the starting requirement of the self-cleaning mode. Specifically, under the condition that the residual electric quantity of the photovoltaic energy storage system is larger than 60%, the flux weakening function is controlled to be started, so that the frequency of the compressor is continuously increased, and the running frequency required by the self-cleaning function is met. And under the condition that the residual capacity of the photovoltaic energy storage system is less than or equal to 60%, judging the running state of the direct current air conditioner before running the self-cleaning mode. And under the condition that the direct current air conditioner runs in a normal cooling mode/heating mode before entering the self-cleaning mode, judging that the user has a temperature regulation requirement at the moment. At the moment, the direct current air conditioner is controlled to start the flux weakening function, so that the frequency of the press is continuously increased, and the requirements of users on temperature regulation and self-cleaning are met. And the direct current air conditioner is in a shutdown state before entering the self-cleaning mode, and the condition that the user does not need temperature regulation at the moment is judged. At this time, the dc air conditioner is controlled to operate at the highest frequency without turning on the magnetic weakening function.
Referring to fig. 6, another method for controlling a dc air conditioner according to an embodiment of the present disclosure includes:
s200, the direct current air conditioner obtains the voltage ratio of the effective value of the voltage of the motor to the voltage of the bus.
S210, the direct current air conditioner judges whether the voltage ratio is larger than or equal to a ratio threshold value. If yes, go to step S220; if not, step S200 is executed.
And S230, judging whether the residual electric quantity value is less than or equal to the electric quantity threshold value by the direct current air conditioner. If yes, go to step S240, go to step S250, or go to step S260; if not, go to step S282.
And S240, the direct current air conditioner acquires indoor personnel parameter information.
And S241, the direct current air conditioner judges whether a user exists indoors or not. If yes, go to step S270; if not, go to step S281.
And S250, the direct current air conditioner acquires time parameter information.
And S251, the direct current air conditioner judges whether the current time is greater than a time threshold value. If yes, go to step S270; if not, go to step S281.
And S260, the direct current air conditioner acquires self-cleaning parameter information.
And S261, judging whether the self-cleaning parameters meet preset conditions or not by the direct current air conditioner. If yes, go to step S282; if not, go to step S270.
S270, the direct current air conditioner obtains the temperature difference value between the indoor environment temperature and the temperature set by the user.
S280, the direct current air conditioner judges whether the temperature difference value is larger than a temperature difference threshold value. If yes, go to step S282; if not, go to step S281.
And S281, the direct current air conditioner adjusts the running frequency of the compressor.
And S282, starting the flux weakening control of the direct current air conditioner.
By adopting the method for controlling the direct current air conditioner, whether the frequency-increasing limiting condition is met can be determined according to the instruction voltage of the compressor motor and the bus voltage, and the start and stop of the flux weakening function are controlled according to the residual electric quantity value of the photovoltaic energy storage system under the condition that the frequency-increasing limiting condition is met, so that the utilization rate of electric energy in the photovoltaic energy storage system is improved. The specific condition of current temperature regulation is judged according to the residual electric quantity value of the photovoltaic energy storage system before entering the field weakening function, and the field weakening function is specifically controlled to be started and stopped from different use angles according to the actual condition of each user. The method adapts to the trend of direct current power generation, improves the accuracy of starting and stopping the flux weakening function of the direct current air conditioner, and fully utilizes the electric energy stored in the photovoltaic energy storage system.
As shown in fig. 7, an apparatus for controlling a dc air conditioner according to an embodiment of the present disclosure includes a processor (processor)100 and a memory (memory) 101. Optionally, the apparatus may also include a Communication Interface (Communication Interface)102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via a bus 103. The communication interface 102 may be used for information transfer. The processor 100 may call logic instructions in the memory 101 to perform the method for controlling the dc air conditioner of the above-described embodiment.
In addition, the logic instructions in the memory 101 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
The memory 101, which is a computer-readable storage medium, may be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing by executing program instructions/modules stored in the memory 101, that is, implements the method for controlling the dc air conditioner in the above-described embodiments.
The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.
The embodiment of the disclosure provides a direct current air conditioner, which comprises the device for controlling the direct current air conditioner.
Embodiments of the present disclosure provide a storage medium storing computer-executable instructions configured to perform the above-described method for controlling a dc air conditioner.
The storage medium may be a transitory storage medium or a non-transitory storage medium.
The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: 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 other various media capable of storing program codes, and may also be a transient storage medium.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple 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 implement the present embodiment. In addition, functional units in the embodiments of the present disclosure 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 flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (10)
1. A method for controlling a dc air conditioner, comprising:
determining whether the frequency-increasing limiting condition is met or not according to the command voltage and the bus voltage of the compressor motor;
and under the condition of meeting the frequency-increasing limiting condition, controlling the start and stop of the flux weakening function according to the residual electric quantity value of the photovoltaic energy storage system so as to improve the utilization rate of electric energy in the photovoltaic energy storage system.
2. The method of claim 1, wherein determining whether an up-conversion limiting condition is satisfied based on the command voltage of the compressor motor and the bus voltage comprises:
calculating the voltage ratio of the effective value of the command voltage of the compressor motor to the bus voltage;
and determining whether the frequency increasing limiting condition is met or not according to the voltage ratio.
3. The method of claim 2, wherein determining whether the frequency-up limiting condition is satisfied according to the voltage ratio comprises:
determining that the up-conversion limiting condition is satisfied if the voltage ratio is greater than or equal to a ratio threshold;
determining that the up-conversion limiting condition is not satisfied if the voltage ratio is less than the ratio threshold.
4. The method according to claim 1, wherein the controlling the start and stop of the flux weakening function according to the residual electric quantity value of the photovoltaic energy storage system comprises:
under the condition that the residual electric quantity value is greater than an electric quantity threshold value, controlling the opening of the flux weakening function so as to improve the running frequency of the compressor;
and controlling the start and stop of the flux weakening function according to the relevant parameter information under the condition that the residual electric quantity value is less than or equal to the electric quantity threshold value.
5. The method according to claim 4, wherein the controlling the start and stop of the flux weakening function according to the relevant parameter information comprises:
determining a target operation frequency of the compressor according to the outdoor environment temperature and the time parameter information;
and controlling the start and stop of the flux weakening function according to the target operating frequency and the temperature value set by the user.
6. The method according to claim 4, wherein the controlling the start and stop of the flux weakening function according to the relevant parameter information comprises:
determining the target operation frequency of the compressor according to the outdoor environment temperature and the indoor personnel parameter information;
and controlling the start and stop of the flux weakening function according to the target operating frequency and the temperature value set by the user.
7. The method according to claim 5 or 6, wherein the controlling the start and stop of the flux weakening function according to the target operating frequency and the user-set temperature value comprises:
determining a temperature difference value between the current indoor temperature and the temperature set by the user;
and starting the flux weakening function to improve the operating frequency of the compressor under the condition that the temperature difference value is greater than or equal to a temperature difference threshold value.
8. The method according to any one of claims 1 to 6, characterized by further comprising, after the controlling the start and stop of the field weakening function:
and starting the magnetic weakening function to improve the running frequency of the compressor under the condition that the air conditioner needs to perform self-cleaning.
9. An apparatus for controlling a dc air conditioner, comprising a processor and a memory storing program instructions, characterized in that the processor is configured to perform the method for controlling a dc air conditioner according to any one of claims 1 to 8 when executing the program instructions.
10. A dc air conditioner characterized by comprising the apparatus for controlling a dc air conditioner according to claim 9.
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