CN111895582A - Compressor control method and device and air conditioning system - Google Patents

Compressor control method and device and air conditioning system Download PDF

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Publication number
CN111895582A
CN111895582A CN202010787199.2A CN202010787199A CN111895582A CN 111895582 A CN111895582 A CN 111895582A CN 202010787199 A CN202010787199 A CN 202010787199A CN 111895582 A CN111895582 A CN 111895582A
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China
Prior art keywords
actual
compressor
operating frequency
air conditioning
room
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CN202010787199.2A
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Chinese (zh)
Inventor
高棋彬
宋培刚
孙常权
吴挺立
黎松桂
姚鸿海
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Guangdong TCL Intelligent HVAC Equipment Co Ltd
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Guangdong TCL Intelligent HVAC Equipment Co Ltd
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Priority to CN202010787199.2A priority Critical patent/CN111895582A/en
Publication of CN111895582A publication Critical patent/CN111895582A/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • 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
    • F24F11/56—Remote control
    • 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
    • F24F11/70—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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • 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

Abstract

The invention discloses a control method of a compressor, which is applied to an air conditioning system comprising a plurality of indoor units, wherein the indoor units are arranged in a plurality of rooms, the rooms are in one-to-one correspondence with the indoor units, and the method comprises the following steps: acquiring set temperature data and actual temperature data of a plurality of rooms; determining the actual cooling capacity requirements of a plurality of rooms according to the set temperature data and the actual temperature data; determining the actual operation frequency of the compressor according to the actual cold quantity demand; the compressor is controlled to operate at the actual operating frequency. The invention also discloses a control device of the compressor and an air conditioning system. The control method of the compressor provided by the invention can enable the running frequency of the compressor of the air conditioning unit of the air conditioning system to be more matched with the actual requirement.

Description

Compressor control method and device and air conditioning system
Technical Field
The invention relates to the technical field of compressor control, in particular to a compressor control method and device and an air conditioning system.
Background
The air conditioning system can realize the functions of air plate refrigeration in summer and heating in winter, and is an air conditioner solution with high comfort and high intelligent integration level which is emerging at home.
However, the fan coil (indoor unit) and the air conditioning unit in the air conditioning system are independently controlled to operate respectively, the fan coil is controlled according to the set temperature and the target temperature of an indoor room, the compressor of the air conditioning unit is controlled according to the set temperature and the return water temperature of a water system in the air conditioning system and independently controlled to operate respectively, and the problem that the operating frequency of the compressor of the air conditioning unit is not matched with the actual requirement of the indoor room exists.
Disclosure of Invention
The invention mainly aims to provide a control method and device of a compressor and an air conditioning system, and aims to solve the technical problem that the running frequency of the compressor of an air conditioning unit is not matched with the actual demand of an indoor room.
In order to achieve the above object, a method for controlling a compressor according to the present invention is applied to an air conditioning system including a plurality of indoor units, the plurality of indoor units being disposed in a plurality of rooms, the plurality of rooms corresponding to the plurality of indoor units one to one, the method including:
acquiring set temperature data and actual temperature data of a plurality of rooms;
determining the actual cooling capacity requirements of a plurality of rooms according to the set temperature data and the actual temperature data;
determining the actual operation frequency of the compressor according to the actual cold quantity demand;
the compressor is controlled to operate at the actual operating frequency.
In order to achieve the above object, the present invention provides a compressor control device applied to an air conditioning system including a plurality of indoor units, the plurality of indoor units being installed in a plurality of rooms, the plurality of rooms corresponding to the plurality of indoor units one-to-one, the compressor control device including:
the system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring set temperature data and actual temperature data of a plurality of rooms;
the first determining module is used for determining the actual cooling capacity requirements of the plurality of rooms according to the set temperature data and the actual temperature data;
the second determining module is used for determining the actual operating frequency of the compressor according to the actual cold quantity demand;
and the control module is used for controlling the compressor to work at the actual running frequency.
In addition, in order to achieve the above object, the present invention further provides an air conditioning system including an air conditioning unit and the control device of the compressor as described above.
Further, in order to achieve the above object, the present invention also provides a control apparatus of a compressor, the apparatus comprising: the control program of the compressor is configured to realize the steps of the control method of the compressor as before.
Further, in order to achieve the above object, the present invention also provides a computer readable storage medium having stored thereon a control program of a compressor, the control program of the compressor implementing the steps of the foregoing control method of the compressor when being executed by a processor.
The embodiment of the invention provides a control method and device of a compressor and an air conditioning system. According to the control method of the compressor, the actual running frequency of the compressor is obtained by using the actual cooling capacity requirements of all rooms of the air conditioning system, so that the actual running frequency of the compressor of the air conditioning unit of the air conditioning system can be more matched with the actual cooling capacity requirements.
Drawings
FIG. 1 is a schematic diagram of a control apparatus for a compressor according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a first embodiment of a control method of a compressor according to the present invention;
FIG. 3 is a detailed flowchart of step S200 in FIG. 1;
fig. 4 is a schematic flow chart of a second embodiment of a control method of a compressor according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a third embodiment of a control method of a compressor according to an embodiment of the present invention;
FIG. 6 is a graph of a fit of one embodiment of the invention (E);
FIG. 7 is another graph of a fit (E) according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a fourth embodiment of a control method of a compressor in an embodiment of the present invention;
fig. 9 is a schematic flow chart showing another option of the fourth embodiment of the control method of the compressor in the embodiment of the present invention;
fig. 10 is a block diagram showing a configuration of a control apparatus for a compressor according to an embodiment of the present invention.
Fig. 11 is a block diagram showing a configuration of a second embodiment of a control apparatus for a compressor according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments 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.
The air conditioning system is mainly used in villas, high-end districts and other occasions and comprises an outdoor water machine (an air conditioning unit), a plurality of terminal fan coil pipes (indoor units), a water system and other waterway accessories. The air conditioner can realize the functions of air disk refrigeration in summer and heating in winter, and is an air conditioner solution with high comfort and high intelligent integration level which is being developed in China.
However, the fan coil (indoor unit) and the air conditioning unit in the air conditioning system operate independently, the fan coil controls the damper to be turned on and off according to the set room temperature and the actual room temperature of a room, the compressor of the air conditioning unit controls the damper to be turned on and off according to the set temperature and the return water temperature of a water system in the air conditioning system, the fan coil and the air conditioning unit operate independently, and the problem that the operating frequency of the compressor of the air conditioning unit is not matched with the actual requirement of the indoor room exists. For example, there are situations where the compressor of an air conditioning unit continues to operate after a period of time after the indoor fan coil has been turned off.
To solve this problem, various embodiments of a control method of a compressor of the present invention are proposed. The control method of the compressor provided by the invention regulates and controls the actual operation frequency of the compressor based on the actual cooling capacity requirement of the room of the air conditioning system, so that the actual operation frequency of the compressor of the air conditioning unit of the air conditioning system is more matched with the actual cooling capacity requirement.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a recommended apparatus of a method for controlling a compressor in a hardware operating environment according to an embodiment of the present invention.
The device may be a User Equipment (UE) such as a Mobile phone, smart phone, laptop, digital broadcast receiver, Personal Digital Assistant (PDA), tablet computer (PAD), handheld device, vehicular device, wearable device, computing device or other processing device connected to a wireless modem, Mobile Station (MS), or the like. The device may be referred to as a user terminal, portable terminal, desktop terminal, etc.
Generally, the apparatus comprises: at least one processor 301, a memory 302 and a control program for a compressor stored on the memory and operable on the processor.
The processor 301 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and so on. The processor 301 may be implemented in at least one hardware form of a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), and a PLA (Programmable Logic Array). The processor 301 may also include a main processor and a coprocessor, where the main processor is a processor for processing data in an awake state, and is also called a Central Processing Unit (CPU); a coprocessor is a low power processor for processing data in a standby state. In some embodiments, the processor 301 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content required to be displayed on the display screen. The processor 301 may further include an AI (Artificial Intelligence) processor for processing control operations regarding the compressor so that a control model of the compressor can be independently trained and learned, improving efficiency and accuracy.
Memory 302 may include one or more computer-readable storage media, which may be non-transitory. Memory 302 may also include high speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in the memory 302 is used to store at least one instruction for execution by the processor 801 to implement the control method of the compressor provided by the method embodiments herein.
In some embodiments, the terminal may further include: a communication interface 303 and at least one peripheral device. The processor 301, the memory 302 and the communication interface 303 may be connected by a bus or signal lines. Various peripheral devices may be connected to communication interface 303 via a bus, signal line, or circuit board. Specifically, the peripheral device includes: at least one of radio frequency circuitry 304 and power supply 305.
The communication interface 303 may be used to connect at least one peripheral device related to I/O (Input/Output) to the processor 301 and the memory 302. The communication interface 303 is used for receiving data uploaded by a user through a peripheral device. In some embodiments, processor 301, memory 302, and communication interface 303 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 301, the memory 302 and the communication interface 303 may be implemented on a single chip or circuit board, which is not limited in this embodiment.
The Radio Frequency circuit 304 is used for receiving and transmitting RF (Radio Frequency) signals, also called electromagnetic signals. The radio frequency circuitry 304 communicates with communication networks and other communication devices via electromagnetic signals. The rf circuit 304 converts an electrical signal into an electromagnetic signal to transmit, or converts a received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 304 comprises: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a subscriber identity module card, and so forth. The radio frequency circuitry 304 may communicate with other terminals via at least one wireless communication protocol. The wireless communication protocols include, but are not limited to: metropolitan area networks, various generation mobile communication networks (2G, 3G, 4G, and 5G), Wireless local area networks, and/or WiFi (Wireless Fidelity) networks. In some embodiments, the rf circuit 304 may further include NFC (Near Field Communication) related circuits, which are not limited in this application.
The power supply 305 is used to supply power to various components in the electronic device. The power source 305 may be alternating current, direct current, disposable or rechargeable. When power source 305 comprises a rechargeable battery, the rechargeable battery may support wired or wireless charging. The rechargeable battery may also be used to support fast charge technology.
Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the control device of the compressor, and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components.
An embodiment of the present invention provides a method for controlling a compressor, and referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the method for controlling a compressor according to the present invention.
In this embodiment, the control method of the compressor includes the steps of:
in step S100, the air conditioning system acquires set temperature data and actual temperature data of a plurality of rooms.
Specifically, in the above step, the air conditioning system includes a plurality of indoor units, and each indoor unit is provided corresponding to one room. The indoor unit can be a fan coil, an air conditioning system end device which is composed of a small fan, a motor, a coil and the like. When cold water or hot water generated by the air conditioning unit flows through the coil pipes, the cold water or the hot water exchanges heat with air in a room outside the pipes, so that the air is cooled, dehumidified or heated to adjust air parameters in the room. The indoor temperature of each room is regulated by the indoor unit. The set temperature data is a data set formed by target temperatures which are preset to be reached by a plurality of rooms after the indoor units of the plurality of rooms are started, and the actual temperature data is a data set formed by actual room temperatures of the rooms where the indoor units are located. It is easily understood that the set temperature data includes a plurality of set room temperatures, the actual temperature data includes a plurality of actual room temperatures, and the plurality of set room temperatures and the plurality of actual room temperatures each correspond to the plurality of rooms one-to-one. The actual room temperature can be monitored by the indoor unit.
The air conditioning system comprises at least one air conditioning unit, wherein the air conditioning unit can be a household air-cooling (hot) water machine unit, and the air conditioning unit is provided with a compressor.
And step S200, the air conditioning system determines the actual cooling capacity requirements of a plurality of rooms according to the set temperature data and the actual temperature data.
Specifically, in the above step, the actual cooling capacity requirement is the cooling capacity requirement of all the fan coils when each room is to reach the corresponding set room temperature. The actual cooling demand is the cooling output that the entire air conditioning system needs to provide.
For convenience of understanding, a specific implementation scheme for calculating the actual cooling capacity requirement is provided in this embodiment, referring to fig. 3, fig. 3 is a detailed flowchart diagram of step S200 in this embodiment, and the specific implementation scheme is as follows:
step S201, the air conditioning system determines the actual cooling capacity requirement of each room according to the set temperature data and the actual temperature data.
Specifically, for any one room M of the plurality of rooms, the set room temperature and the actual room temperature of the room M are input into a prestored cooling demand formula for calculation, so as to obtain the actual cooling demand of the room M.
The cold quantity requirement formula is as follows:
Q＝∫(L×ρ×ΔT)，
wherein Q is the actual required cold capacity, L is the water flow of the room, rho is the water density, and Delta T is the difference between the actual room temperature of the room and the set room temperature of the room.
Step S202, the air conditioning system determines the actual cooling capacity requirements of a plurality of rooms according to the actual cooling capacity requirements of each room.
Specifically, the actual cooling capacity demand is obtained by summarizing the obtained individual actual cooling capacity demands of the respective rooms.
For example, in one embodiment, the air conditioning system includes n indoor units, where n is an integer greater than or equal to 1. At this time, the actual cooling capacity demand is obtained by the following formula:
QS＝Q1+Q2+…+QM+…+Qn；
wherein Q isSFor the actual cold requirement, QiThe actual cooling capacity requirement of the Mth room is divided, wherein M is more than or equal to 1 and less than or equal to n.
And step S300, the air conditioning system determines the actual running frequency of the compressor according to the actual cooling capacity requirement.
Specifically, the actual cooling demand is the cooling and heating output required by the entire air conditioning system, which is achieved by the compressor in the air conditioning unit of the household air conditioner. The actual operating frequency that the compressor needs to achieve when it is required to meet this cold heat output can therefore be determined from the actual cold demand.
For convenience of understanding, this embodiment provides a specific implementation scheme for calculating the actual operating frequency, which is as follows:
and inputting the actual cold quantity requirement into a prestored first operating frequency formula for calculation to obtain the actual operating frequency of the compressor.
Wherein the first operating frequency formula is:
Figure BDA0002621445180000071
wherein N issFor the actual operating frequency of the compressor, λ is the correction factor, QSFor the actual required refrigeration capacity, Q, obtained in step S202dRated cooling capacity, N, for the systemdIs the nominal operating frequency of the compressor.
In step S400, the air conditioning system controls the compressor to operate at an actual operating frequency.
Specifically, after the actual operating frequency of the compressor required to meet the actual cooling capacity requirement is obtained, the compressor can be controlled to work based on the obtained actual operating frequency, so that the actual operating frequency of the compressor is matched with the actual cooling capacity requirements of a plurality of rooms.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and those skilled in the art can set the technical solution based on the needs in practical application, and the technical solution is not limited herein.
Compared with the prior art that the frequency of the compressor of the air conditioning unit in the air conditioning system is controlled by the set temperature and the return water temperature of the water system, the control method of the compressor provided by the embodiment of the invention determines the actual operating frequency of the compressor by using the actual cooling capacity requirements of a plurality of rooms of the air conditioning system, so that the actual operating frequency of the compressor of the air conditioning unit of the air conditioning system is more matched with the actual cooling capacity requirements of the plurality of rooms. The actual operating frequency of the compressor timely responds to the dynamic change of the terminal load in the air conditioning system, the comfort of the terminal device in the air conditioning system is improved, meanwhile, the operating frequency of the compressor is controlled more accurately, the stability of the air conditioning system is improved, and the condition that the temperature fluctuation of an air conditioning room is large due to the fact that the terminal devices such as a fan coil and the like are frequently started and stopped in the prior art is avoided.
A second embodiment of the method for controlling a compressor according to the present invention is proposed based on the first embodiment of the method for controlling a compressor according to the present invention described above. Referring to fig. 4, fig. 4 is a flowchart illustrating a control method of a compressor according to a second embodiment of the present invention.
Step S100, the air conditioning system obtains the set temperature data and the actual temperature data of the plurality of rooms, and may be adjusted as follows:
in step S100', the air conditioning system periodically acquires set temperature data and actual temperature data of a plurality of rooms.
Specifically, controlling the actual operating frequency of the compressor according to the actual cooling demand requires monitoring the actual cooling demand of the plurality of rooms in real time, i.e., acquiring the set temperature data and the actual temperature data of the plurality of rooms. However, the real-time set temperature data and the actual temperature data cause the operating cost of the air conditioning system to be too high, and particularly, the room temperature of the air conditioning system is in a stable state for a long time in the operating process, so that the set temperature data and the actual temperature data of a plurality of rooms can be used, and the operating cost of the air conditioning system is reduced.
For easy understanding, this embodiment provides a specific implementation scheme for periodically monitoring the actual cooling demand, specifically, each monitoring period may be set to 6min, that is, the set room temperature and the actual room temperature of each room are acquired every 6min, the actual cooling demands of the multiple rooms in the monitoring period are determined based on the acquired set room temperature and actual room temperature, and the compressor is controlled to operate at the actual operating frequency until after step S100' is executed again in the next monitoring period.
A third embodiment of the control method of the compressor of the present invention is proposed based on the first and second embodiments of the control method of the compressor of the present invention described above. In practical application, after the actual operation frequency of the compressor is obtained through the actual cold quantity demand, the actual operation frequency of the compressor can be adjusted based on the speed of water temperature change in a water system of the air conditioning system. Referring to fig. 5, fig. 5 is a flowchart illustrating a control method of a compressor according to a third embodiment of the present invention.
For ease of understanding, the following detailed description is provided. After step S300, the control method further includes:
step S500, the air conditioning system obtains the set temperature and the actual water inlet temperature of a plurality of indoor units.
It should be noted here that, in the air conditioning system, a plurality of indoor units are all connected to one air conditioning unit through one water system, that is, the water temperature change rates of the indoor units are consistent. The change rate among the indoor units is also the change rate of the water temperature of the air conditioning system. Due to the difference in the size of the water system capacity of the air conditioning system, the rate of change (increase or decrease) of the water temperature in the water system is also different in the case where the same cooling or heating temperature is set. If the actual water system capacity is too small, the water temperature change rate of the water system is high, and the water temperature is easy to exceed the set temperature range, so that the compressor is stopped; if the actual water system capacity is too large, the water temperature change rate of the water system is slow, so that the time for the water temperature to reach the set temperature value is long, and the comfort of a user is influenced. The water temperature change rate is used for representing the speed of the water temperature change of the water system in the air-conditioning system. It will be readily appreciated that the rate of change of the water temperature may include a rate of temperature rise and a rate of temperature drop, wherein the rate of temperature rise refers to the rate of temperature rise and the rate of temperature drop refers to the rate of temperature drop. It will be readily appreciated that the rate of change of the water temperature may be determined by the set temperature and the actual inlet water temperature.
Specifically, in the above steps, the actual inlet water temperature is the inlet water temperature of the air conditioning unit in the air conditioning system, and it is easy to understand that the collection point of the actual inlet water temperature is located on the internal pipeline of the air conditioning unit. The set temperature is the set water temperature of the air conditioning system and is the target temperature which needs to be reached by water in the water system in the air conditioning system. Because the air conditioning unit is communicated with the indoor units through a water system, the water temperature of the air conditioning unit can also reflect the set temperature of the indoor units.
In addition, it is worth mentioning that the set temperature and the actual inlet water temperature may be obtained periodically in the above steps. The period may be set by the user, for example the period may be equivalent to the monitoring period, i.e. 6 min. Namely, the actual water inlet temperature collected by the collecting point and the set temperature set by the user of the air conditioning unit at the moment are obtained every 6 min.
Then, the temperature difference value can be determined based on the actual inlet water temperature and the set temperature in each period.
For convenience of understanding, this embodiment provides a specific implementation scheme for calculating the temperature difference, which is as follows:
the air conditioning unit is provided with a refrigeration mode and a heating mode.
When the air conditioning unit is in the cooling mode, the temperature difference value is obtained through the following formula:
E＝Tinto-Tw；
When the air conditioning unit is in a heating mode, obtaining a temperature difference value through the following formula:
E＝Tw-Tinto；
Wherein E is the temperature difference, TIntoIs the actual inlet water temperature, TwTo set the temperature.
And step S600, the air conditioning system determines the compensation operation frequency of the compressor according to the set temperature and the actual water inlet temperature.
And step S700, the air conditioning system determines the compensated operation frequency of the compressor according to the compensated operation frequency and the actual operation frequency.
Specifically, in this embodiment, the actual operating frequency is dynamically corrected by compensating the operating frequency, so that the actual operating frequency of the compressor of the air conditioning unit can respond to the change of the water temperature in the air conditioning system more timely, and the ambient temperature of the air conditioning room can reach the set temperature more quickly. The influence of the hysteresis of the water system in the air conditioning system on the operation of the compressor at the actual operating frequency is avoided.
For convenience of understanding, this embodiment provides a specific implementation scheme for calculating the compensated operating frequency, which is as follows:
specifically, the compensated operating frequency may be obtained by:
Figure BDA0002621445180000101
wherein N isAfter compensationTo compensate for the post-operating frequency, NsFor the actual operating frequency, NpTo compensate for the operating frequency.
In this embodiment, since the monitoring period is a fixed value, the compensation frequency can be obtained by the following formula:
Np＝∫(E)+k；
wherein E is the temperature difference, k is the engineering debugging coefficient, and the value of k can be 1.
Wherein ^ E can be fit by actual data. Specifically, a common quadratic function can be adopted, and the fitting can be performed through more than 3 groups of data, and if a more accurate change curve needs to be determined, the fitting can be performed through more than 3 groups of data.
For ease of understanding, this example presents several specific implementations of actual data fitting.
For example, in one embodiment, the following data is included:
E Np
1 5
2 7
3 9
7 11
10 12
at this time, referring to FIG. 6, the integral (E) may be fit, Np＝-0.1061E2+1.8765E+3.6259。
For example, in another embodiment, the following data is included:
Figure BDA0002621445180000102
Figure BDA0002621445180000111
at this time, referring to FIG. 7, the integral (E) may be fit, Np＝-0.1071E2+1.8714E+1.5786。
Step S400 is adaptively adjusted to step S400', and the air conditioning system controls the compressor to operate at the compensated operating frequency.
The compressor of the air conditioning unit in the traditional air conditioning system controls the running frequency of the compressor through the outlet water temperature or the return water temperature of the water system, and no matter the outlet water temperature or the return water temperature is collected on an internal pipeline of the air conditioning unit. The running frequency of the compressor can timely respond to the dynamic change of the terminal load in the air conditioning system and the change of the water temperature in the water system, so that the ambient temperature can reach the set temperature more quickly, the frequency of the compressor can be controlled more accurately, and the stability of the air conditioning system is improved.
A fourth embodiment of the method for controlling a compressor of the present invention is proposed based on the first, second, and third embodiments of the above-described method for controlling a compressor of the present invention. Referring to fig. 8, fig. 8 is a flowchart illustrating a control method of a compressor according to a fourth embodiment of the present invention.
In this embodiment, in step S400, the step of controlling the compressor to operate at the actual operating frequency by the air conditioning system includes:
in step S401, the air conditioning system acquires a rated operating frequency of the compressor.
In step S402, the air conditioning system determines whether the actual operating frequency is less than or equal to the rated operating frequency.
In step S403, if the actual operating frequency is less than or equal to the rated operating frequency, the air conditioning system controls the compressor to operate at the actual operating frequency.
Specifically, in one embodiment, in the above step, if N iss≤NdControlling the frequency of the compressor to be through
Figure BDA0002621445180000112
Calculated NsAnd (5) operating.
As an option of this embodiment, referring to fig. 9, after the step S402, the air conditioning system determines whether the actual operating frequency is less than or equal to the rated operating frequency, the method further includes:
in step S404, if the actual operating frequency is greater than the rated operating frequency, the air conditioning system controls the compressor to operate at the variable operating frequency.
Specifically, in one embodiment, in the above step, if N iss＞NdAt this time, the frequency of the compressor in order to satisfy the actual cooling capacity demand needs to exceed the rated operating frequency of the compressor, that is, the compressor needs to be operated beyond the rated operating power, and thus, the operation of the compressor at the variable frequency is controlled. This embodiment provides a specific implementation of calculating the variable operating frequency.
Specifically, the variable operating frequency is determined by a pre-stored second operating frequency formula, which is: n is a radical ofi＝Nd+Ni；
Wherein N isiFor variable operating frequencies, NdFor the rated operation frequency, i is the ith lifting period, and N is the operation frequency increment value of each lifting period.
Specifically, the lifting period may be smaller than the monitoring period, which may be set to 3min, and may also be adaptively adjusted and set according to the monitoring period in actual use.
As an alternative to this embodiment, N may be obtained by the following formula:
Figure BDA0002621445180000121
in this case, i is not less than 1 and not more than 5.
To facilitate a better implementation of the above-described aspects of embodiments of the present invention, the following also provides relevant means for implementing the above-described aspects. Referring to fig. 10, fig. 10 is a block diagram illustrating a structure of a control apparatus for a compressor according to a first embodiment of the present invention.
As shown in fig. 10, a control device of a compressor according to an embodiment of the present invention is used for an air conditioning system, and includes:
the first acquiring module 10 is used for acquiring set temperature data and actual temperature data of a plurality of rooms.
A first determining module 20 for determining the actual cooling demand of the plurality of rooms based on the set temperature data and the actual temperature data.
A second determination module 30 for determining the actual operating frequency of the compressor on the basis of the actual refrigeration requirement.
And a control module 40 for controlling the compressor to operate at the actual operating frequency.
A second embodiment of the control device for a compressor according to the present invention is proposed based on the first embodiment of the control device for a compressor according to the present invention. Referring to fig. 11, fig. 11 is a block diagram illustrating a second embodiment of a control apparatus for a compressor according to the present invention.
In this embodiment, the apparatus further comprises:
and a second obtaining module 50, configured to obtain set temperatures and actual water inlet temperatures of the indoor units.
And a third determining module 60 for determining a compensated operating frequency of the compressor based on the set temperature and the actual inlet water temperature.
A fourth determining module 70, configured to determine a compensated operating frequency of the compressor according to the compensated operating frequency and the actual operating frequency;
other embodiments or specific implementations of the control device of the compressor of the present invention can refer to the above method embodiments, and are not described herein again.
In order to better implement the above-mentioned solution of the embodiment of the present invention, an air conditioning system for implementing the above-mentioned solution is further provided below, which includes an air conditioning unit and a control device of the compressor as before.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, where a control program of a compressor is stored on the computer-readable storage medium, and when the control program of the compressor is executed by a processor, the steps of the control method of the compressor are implemented as above.
Therefore, a detailed description thereof will be omitted. In addition, the beneficial effects of the same method are not described in detail. For technical details not disclosed in embodiments of the computer-readable storage medium referred to in the present application, reference is made to the description of embodiments of the method of the present application. It is determined that, by way of example, the program instructions may be deployed to be executed on one computing device or on multiple computing devices at one site or distributed across multiple sites and interconnected by a communication network.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
It should be noted that the above-described embodiments of the apparatus are merely schematic, where units illustrated as separate components may or may not be physically separate, and components illustrated as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus necessary general hardware, and may also be implemented by special hardware including special integrated circuits, special CPUs, special memories, special components and the like. Generally, functions performed by computer programs can be easily implemented by corresponding hardware, and specific hardware structures for implementing the same functions may be various, such as analog circuits, digital circuits, or dedicated circuits. However, the implementation of a software program is a more preferable embodiment for the present invention. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, where the computer software product is stored in a readable storage medium, such as a floppy disk, a usb disk, a removable hard disk, a Read-only memory (ROM), a random-access memory (RAM), a magnetic disk or an optical disk of a computer, and includes instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.

Claims (12)

1. A control method of a compressor is applied to an air conditioning system comprising a plurality of indoor units, wherein the indoor units are arranged in a plurality of rooms, and the rooms are in one-to-one correspondence with the indoor units, and the method comprises the following steps:
acquiring set temperature data and actual temperature data of the plurality of rooms;
determining the actual cooling capacity requirements of the plurality of rooms according to the set temperature data and the actual temperature data;
determining the actual operating frequency of the compressor according to the actual cold quantity demand;
controlling the compressor to operate at the actual operating frequency.
2. Method according to claim 1, characterized in that after determining the actual operating frequency of the compressor on the basis of the actual refrigeration requirement, the method further comprises:
acquiring set temperatures and actual water inlet temperatures of the indoor units;
determining the compensation operation frequency of the compressor according to the set temperature and the actual inlet water temperature;
determining a compensated operating frequency of the compressor according to the compensated operating frequency and the actual operating frequency;
the controlling the compressor to operate at the actual operating frequency includes:
controlling the compressor to operate at the compensated operating frequency.
3. The method according to claim 2, characterized in that said determining the actual cooling demand of said plurality of rooms from said set temperature data and said actual temperature data comprises;
determining the actual cold quantity requirement of each room according to the set temperature data and the actual temperature data;
and determining the actual cooling capacity requirements of the plurality of rooms according to the actual cooling capacity requirements of the rooms.
4. The method of claim 3, wherein the set temperature data comprises a plurality of set room temperatures, the actual temperature data comprises a plurality of actual room temperatures, the plurality of set room temperatures and the plurality of actual room temperatures each correspond to the plurality of rooms one-to-one, and the determining the actual cooling demand for each room based on the set temperature data and the actual temperature data comprises:
inputting the set room temperature and the actual room temperature of a room M into a prestored cold quantity demand formula for calculation to obtain the actual cold quantity demand of the room M, wherein the room M is any one of the plurality of rooms;
wherein, the cold quantity requirement formula is as follows:
Q＝∫(L×ρ×ΔT)，
q is the actual required cold quantity of the room, L is the water flow of the room, rho is the water density, and Delta T is the difference value between the actual room temperature of the room and the set room temperature of the room.
5. Method according to claim 4, characterised in that said determination of the actual operating frequency of the compressor from the actual refrigeration demand comprises:
inputting the actual cold quantity requirement into a prestored first operating frequency formula for calculation to obtain the actual operating frequency of the compressor;
wherein the first operating frequency formula is:
Figure FDA0002621445170000021
said N issFor the actual operating frequency of the compressor, the lambda is a correction factor, the QSFor the actual required refrigeration capacity, QdFor rated cooling capacity of the system, NdIs the nominal operating frequency of the compressor.
6. The method of claim 5, wherein said controlling said compressor to operate at said actual operating frequency comprises:
and if the actual operating frequency is less than or equal to the rated operating frequency, controlling the compressor to work at the actual operating frequency.
7. The method of claim 6, wherein said controlling said compressor to operate at said actual operating frequency further comprises:
if the actual operating frequency is greater than the rated operating frequency, controlling the compressor to work at a variable operating frequency;
wherein the variable operating frequency is determined by a pre-stored second operating frequency formula, the second operating frequency formula being:
Ni＝Nd+i×N，
said N isiFor the variable operating frequency, NdFor the rated operation frequency, i is the ith lifting period, and N is the operation frequency increment value of each lifting period.
8. The method of claim 2, wherein said determining a compensated operating frequency of said compressor based on said set temperature and said actual inlet water temperature comprises:
determining a water temperature change value according to the set temperature and the actual inlet water temperature;
and inputting the water temperature change value into a prestored third operating frequency formula for calculation to obtain the compensation operating frequency of the compressor.
9. A control device for a compressor, applied to an air conditioning system including a plurality of indoor units provided in a plurality of rooms in one-to-one correspondence with the plurality of indoor units, the device comprising:
the first acquisition module is used for acquiring set temperature data and actual temperature data of the plurality of rooms;
the first determining module is used for determining the actual cooling capacity requirements of the plurality of rooms according to the set temperature data and the actual temperature data;
the second determining module is used for determining the actual operating frequency of the compressor according to the actual cold quantity demand;
and the control module is used for controlling the compressor to work at the actual running frequency.
10. An air conditioning system comprising an air conditioning assembly and a control for the compressor of claim 9.
11. A control apparatus of a compressor, characterized in that the apparatus comprises: memory, a processor and a control program of a compressor stored on the memory and executable on the processor, the control program of the compressor being configured to implement the steps of the control method of a compressor according to any one of claims 1 to 8.
12. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a control program of a compressor, which when executed by a processor implements the steps of the control method of a compressor according to any one of claims 1 to 8.
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