Air conditioning system and control method thereof

Abstract

The application provides an air conditioning system and a control method thereof, and particularly relates to the technical field of air conditioning, and is used for improving the operation efficiency of the air conditioning system. The air conditioning system comprises at least one fixed-frequency module, at least one variable-frequency module, a total water pipeline and a controller. The fixed-frequency module comprises a fixed-frequency compressor. The variable-frequency module comprises a variable-frequency compressor. The controller is configured to: determine an energy demand parameter according to a current water temperature and a target water temperature of the total water pipeline; determine a compressor target total frequency according to the energy demand parameter and a normalization parameter; determine a current running compressor total frequency according to parameters of a current running compressor and the normalization parameter; and adjust an operation strategy of the air conditioning system according to the compressor target total frequency and the current running compressor total frequency.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to an air conditioning system and its control method. Background Technology

[0002] Currently, in the central air conditioning field, modular air conditioning systems are commonly used to regulate indoor temperature. These modules can be either air-cooled or water-cooled. Because the load capacity of a single module is limited, multiple modules are typically combined in practical applications to meet the load requirements of the air conditioning system. Furthermore, with the development of inverter technology, modular air conditioning systems often employ a combination of fixed-frequency and variable-frequency modules.

[0003] When the load demand of an air conditioning system changes, the status of the operating modules in the module combination needs to be adjusted in real time to meet the usage requirements. In related technologies, the load increase and decrease control of the variable frequency modules in the module combination usually adopts the control logic of the fixed frequency modules. Therefore, in practical applications, there are situations where fixed frequency modules and variable frequency modules operate simultaneously, or some variable frequency modules work at full load while the others do not operate, resulting in poor overall energy efficiency of the air conditioning system and waste of resources.

[0004] Therefore, how to adjust the operation strategy of the air conditioning system according to the load demand is an urgent problem to be solved. Summary of the Invention

[0005] This application provides an air conditioning system and its control method to improve the operating efficiency of the air conditioning system.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0007] In a first aspect, an air conditioning system is provided, comprising:

[0008] At least one fixed-frequency module, the fixed-frequency module including a fixed-frequency compressor;

[0009] At least one variable frequency module, the variable frequency module including a variable frequency compressor;

[0010] The main water pipeline is connected to the water pipelines of at least one fixed-frequency air-cooled module and at least one variable-frequency air-cooled module.

[0011] The controller, electrically connected to at least one fixed-frequency module and at least one variable-frequency module, is configured to:

[0012] Determine the energy demand parameters based on the current water temperature and target water temperature in the main water pipeline;

[0013] The target total frequency of the compressor is determined based on the energy demand parameters and the normalization parameters. The normalization parameters are used to normalize the fixed-frequency compressor and the variable-frequency compressor into a standard compressor.

[0014] Based on the parameters and normalized parameters of the currently operating compressors, determine the total frequency of the currently operating compressors. The parameters of the currently operating compressors include the number of currently operating fixed-frequency compressors and the number of currently operating variable-frequency compressors.

[0015] Based on the target total frequency of the compressor and the current total frequency of the operating compressor, adjust the operating strategy of the air conditioning system. The operating strategy includes one or more of the following: the number of fixed-frequency compressors in operation, the number of variable-frequency compressors in operation, and the operating frequency of the variable-frequency compressors.

[0016] The technical solution provided in this application has at least the following beneficial effects: First, by normalizing parameters, this application normalizes fixed-frequency compressors and variable-frequency compressors into standard compressors, which can make the determined total frequency of the compressor and the total frequency of the currently running compressor more accurate, thereby making the adjustment of the air conditioning system more precise.

[0017] Secondly, this application adjusts the operating strategy of the air conditioning system based on the target total frequency (load demand) of the compressor and the current total frequency of the operating compressor, which can optimize the operating efficiency of the air conditioning system.

[0018] In some embodiments, the normalization parameters include a capacity factor and a standard compressor frequency. The capacity factor is the ratio of the compressor capacity to the standard compressor capacity, and one capacity factor corresponds to one compressor. The controller executes the determination of the target total compressor frequency based on the energy demand parameters and the normalization parameters, specifically configured to: determine a first quantity based on the capacity factor of each fixed-frequency compressor, the first quantity being the total number of fixed-frequency compressors normalized to the standard compressor; determine a second quantity based on the capacity factor of each variable-frequency compressor, the second quantity being the total number of variable-frequency compressors normalized to the standard compressor; and determine the target total compressor frequency based on the first quantity, the second quantity, the standard compressor frequency, and the energy demand parameters.

[0019] As can be seen from the above embodiments, this application normalizes fixed-frequency compressors and variable-frequency compressors into standard compressors, determines the target number and operating frequency of the standard compressors to be adjusted according to their operating frequencies, and then determines the number of fixed-frequency compressors and variable-frequency compressors to be operated based on the required number and operating frequencies of the standard compressors to be adjusted. In this way, the target total frequency of the compressors determined based on the first and second normalized numbers is more accurate, resulting in more precise adjustment of the air conditioning system.

[0020] In some embodiments, the controller performs the function of determining the total frequency of the currently operating compressors based on the parameters and normalized parameters of the currently operating compressors. Specifically, this is configured to determine the total frequency of the currently operating compressors based on the number of currently operating fixed-frequency compressors, the number of currently operating variable-frequency compressors, and the standard compressor frequency.

[0021] As can be seen from the above embodiments, the total frequency of the currently operating compressor determined based on the normalized parameter (standard compressor frequency) is more consistent with the actual total compressor frequency, thereby making the adjustment of the air conditioning system based on the current total operating compressor frequency more accurate.

[0022] In some embodiments, the controller executes an operation strategy for adjusting the air conditioning system based on the target total frequency of the compressor and the current total frequency of the operating compressor. Specifically, it is configured to adjust the number of operating variable frequency compressors when the target total frequency of the compressor is above the current total frequency of the operating compressor, such that the number of operating variable frequency compressors is above the number of currently operating variable frequency compressors.

[0023] Because variable frequency compressors operate at lower frequencies when the air conditioning system load is low, their energy efficiency is significantly higher than that of fixed frequency compressors; conversely, when the air conditioning system load is high, variable frequency compressors operate at higher frequencies, resulting in lower energy efficiency than fixed frequency compressors. When the target total frequency of the compressors is above the current operating total frequency, it indicates that the air conditioning system load demand is low. Therefore, this application proposes increasing the number of variable frequency compressors in operation to further improve the efficiency of the air conditioning system.

[0024] In some embodiments, the controller is further configured to adjust the number of fixed-frequency compressors in operation based on the target total frequency of the compressor, the standard total frequency of the compressor, and the number of currently operating variable-frequency compressors, wherein the number of operating fixed-frequency compressors is greater than the number of currently operating fixed-frequency compressors.

[0025] In some embodiments, the controller adjusts the number of fixed-frequency compressors in operation based on the target total frequency of the compressor, the standard total frequency of the compressor, and the number of currently operating variable-frequency compressors. Specifically, the controller is configured to: adjust the number of fixed-frequency compressors in operation when the target total frequency of the compressor is below the standard total frequency of the compressor and the number of currently operating variable-frequency compressors is below the total number of variable-frequency compressors, such that the number of fixed-frequency compressors in operation is the same as the current number of fixed-frequency compressors in operation; adjust the operating frequency of the variable-frequency compressors to a first preset frequency, which is the optimal operating frequency of the variable-frequency compressors; adjust the number of fixed-frequency compressors in operation when the target total frequency of the compressor is below the standard total frequency of the compressor and the number of currently operating variable-frequency compressors is the same as the total number of variable-frequency compressors in operation, such that the number of fixed-frequency compressors in operation is the same as the current number of fixed-frequency compressors in operation; adjust the operating frequency of the variable-frequency compressors to a second preset frequency, which is different from the first preset frequency; adjust the number of fixed-frequency compressors in operation when the target total frequency of the compressor is above the standard total frequency of the compressor, such that the number of fixed-frequency compressors in operation is above the current number of fixed-frequency compressors in operation; and adjust the operating frequency of the variable-frequency compressors to a third preset frequency, which is different from the first and second preset frequencies.

[0026] In some embodiments, the controller executes an operation strategy for adjusting the air conditioning system based on the target total frequency of the compressor and the current total frequency of the operating compressor. Specifically, it is configured to adjust the number of fixed-frequency compressors when the target total frequency of the compressor is below the current total frequency of the operating compressor, such that the number of fixed-frequency compressors is below the number of currently operating fixed-frequency compressors.

[0027] As can be seen from the above embodiments, when the target total frequency of the compressor is below the current operating total frequency of the compressor, it indicates that the load demand of the air conditioning system is relatively small. In this regard, this application can improve the efficiency of the air conditioning system by reducing the number of fixed-frequency compressors in operation.

[0028] In some embodiments, when the target total frequency of the compressor is below the total frequency of the currently operating compressor, the controller performs an adjustment of the number of fixed-frequency compressors. Specifically, it is configured to: adjust the number of fixed-frequency compressors to 0 when the target total frequency of the compressor is below the standard total frequency of the compressor; reduce the number of currently operating fixed-frequency compressors when the difference between the target total frequency of the compressor and the standard total frequency of the compressor is below a target threshold; and reduce the operating frequency of the currently operating variable-frequency compressor when the difference between the target total frequency of the compressor and the standard total frequency of the compressor is above the target threshold.

[0029] In some embodiments, the controller performs an adjustment of the air conditioning system’s operating strategy based on the compressor’s target total frequency and the current operating compressor’s total frequency. Specifically, it is configured to maintain the operating strategy unchanged when the compressor’s target total frequency is the same as the current operating compressor’s total frequency.

[0030] As can be seen from the above embodiments, when the target total frequency of the compressor is equal to the total frequency of the currently operating compressor, it means that the current load of the air conditioning system just meets the usage requirements, and there is no need to change the operating strategy of the air conditioning system.

[0031] Secondly, embodiments of this application provide a control method for an air conditioning system, the method comprising:

[0032] Determine the energy demand parameters based on the current water temperature and target water temperature in the main water pipeline;

[0033] The target total frequency of the compressor is determined based on the energy demand parameters and the normalization parameters. The normalization parameters are used to normalize the fixed-frequency compressor and the variable-frequency compressor into a standard compressor.

[0034] Based on the parameters and normalized parameters of the currently operating compressors, determine the total frequency of the currently operating compressors. The parameters of the currently operating compressors include the number of currently operating fixed-frequency compressors and the number of currently operating variable-frequency compressors.

[0035] Based on the target total frequency of the compressor and the current total frequency of the operating compressor, adjust the operating strategy of the air conditioning system. The operating strategy includes one or more of the following: the number of fixed-frequency compressors in operation, the number of variable-frequency compressors in operation, and the operating frequency of the variable-frequency compressors.

[0036] Thirdly, embodiments of this application provide a controller, including: one or more processors; one or more memories; wherein the one or more memories are used to store computer program code, the computer program code including computer instructions, and when the one or more processors execute the computer instructions, the controller executes the control method provided in the second aspect.

[0037] Fourthly, embodiments of this application provide a computer-readable storage medium including computer instructions that, when controlled on a computer, cause the computer to perform the methods provided in the second aspect and possible implementations.

[0038] Fifthly, embodiments of the present invention provide a computer program product that can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can implement the methods provided in the second aspect and possible implementations.

[0039] It should be noted that the aforementioned computer instructions may be stored, in whole or in part, on a computer-readable storage medium. This computer-readable storage medium may be packaged together with the controller's processor, or it may be packaged separately from the controller's processor; this application does not impose any limitations on this.

[0040] The beneficial effects described in aspects two through five of this application can be referred to the analysis of the beneficial effects of aspect one, and will not be repeated here. Attached Figure Description

[0041] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0042] Figure 1 This is a schematic diagram of the composition of an air conditioning system provided in an embodiment of this application;

[0043] Figure 2 This application provides a schematic diagram of the structure of an air conditioning system according to an embodiment of the present application.

[0044] Figure 3 This is a schematic diagram of the hardware configuration of an air conditioning system provided in an embodiment of this application;

[0045] Figure 4 A flowchart of a control method for an air conditioning system provided in an embodiment of this application;

[0046] Figure 5 A flowchart illustrating another control method for an air conditioning system provided in this application embodiment;

[0047] Figure 6 A flowchart illustrating another control method for an air conditioning system provided in this application embodiment;

[0048] Figure 7 A flowchart illustrating another control method for an air conditioning system provided in this application embodiment;

[0049] Figure 8 A flowchart illustrating another control method for an air conditioning system provided in this application embodiment;

[0050] Figure 9 A flowchart illustrating another control method for an air conditioning system provided in this application embodiment;

[0051] Figure 10 A flowchart of another air conditioning system control method provided in an embodiment of this application. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0054] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0055] The terms "above" and "below" in this article may or may not include the number itself.

[0056] The terms “comprising” and “having”, and any variations thereof, used in the description of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include other steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0057] Furthermore, in the embodiments of this application, the words "exemplary" or "for example" are used to indicate that they are examples, illustrations, or descriptions. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0058] As described in the background section, in the current central air conditioning field, modular air conditioning systems are commonly used to regulate indoor temperature. These modules can be either air-cooled or water-cooled. Because the load capacity of a single module is limited, multiple modules are typically combined in practical applications to meet the load requirements of the air conditioning system. Furthermore, with the development of inverter technology, modular air conditioning systems often employ a combination of fixed-frequency and variable-frequency modules.

[0059] When the load demand of an air conditioning system changes, the status of the operating modules in the module combination needs to be adjusted in real time to meet the usage requirements. In related technologies, the load increase and decrease control of the variable frequency modules in the module combination usually adopts the control logic of the fixed frequency modules. Therefore, in practical applications, there are situations where fixed frequency modules and variable frequency modules operate simultaneously, or some variable frequency modules work at full load while the others do not operate, resulting in poor overall energy efficiency of the air conditioning system and waste of resources.

[0060] Therefore, how to adjust the operation strategy of the air conditioning system according to the load demand is an urgent problem to be solved.

[0061] In view of this, embodiments of this application provide an air conditioning system and its control method, which are used to adjust the operating strategy of the air conditioning system according to load demand so as to optimize the operating efficiency of the air conditioning system.

[0062] This application normalizes fixed-frequency compressors and variable-frequency compressors into standard compressors, determines the target number and operating frequency of the standard compressors to be adjusted based on their operating frequencies, and then determines the number of fixed-frequency compressors, the number of variable-frequency compressors, and their operating frequencies based on the required number and operating frequencies of the standard compressors to be adjusted. This allows for more precise adjustment of the air conditioning system.

[0063] Secondly, this application adjusts the operating strategy of the air conditioning system based on the target total frequency of the compressor and the current total frequency of the operating compressor, which can optimize the operating efficiency of the air conditioning system.

[0064] In this application, the module combination in the air conditioning system can be either an air-cooled module or a water-cooled module, and this application does not impose any restrictions on this. The module combination in this application is illustrated using an air-cooled module as an example.

[0065] To further describe the technical solutions of the embodiments of this application, as follows: Figure 1 The diagram shown is a schematic representation of an air conditioning system provided in an embodiment of this application.

[0066] like Figure 1As shown, the air conditioning system 100 includes a main unit module 101 and multiple slave units 102. The main unit module 101 can be connected to the slave units 102 via communication lines, and the multiple slave units 102 can also be connected to each other via communication lines.

[0067] Optionally, the slave module 102 includes a fixed-frequency module and a variable-frequency module. The fixed-frequency module contains only a compressor and operates in two states: on and off. When the indoor temperature reaches the set value, the compressor of the fixed-frequency module turns on, compressing the refrigerant into a high-temperature, high-pressure gas. This gas then dissipates heat through the condenser, condensing into a high-pressure liquid. The liquid then passes through the expansion valve into the evaporator, where it absorbs heat to cool the indoor air before returning to the compressor for recirculation.

[0068] The inverter module structure includes an inverter driver and an inverter compressor. The inverter driver can adjust the compressor speed, enabling stepless adjustment according to the required cooling capacity of the room. When the indoor temperature reaches the set value, the inverter module automatically adjusts the compressor speed to adapt to the current required cooling capacity, thereby improving energy efficiency and energy saving.

[0069] The difference between fixed-frequency and variable-frequency modules in terms of control logic is that fixed-frequency modules generally use a simple on / off control method, using a temperature sensor to detect changes in indoor temperature to control the on / off state; while variable-frequency modules use a variable-frequency drive to adjust the compressor speed according to actual needs, employing a more intelligent control strategy to achieve temperature control and energy efficiency optimization.

[0070] In some embodiments, the host module 101 is used to control the operating status of the entire air conditioning system 100, including the operating status of each slave module 102.

[0071] In some embodiments, the slave module 102 may include at least one refrigerant circulation loop, which consists of a compressor, a four-way valve, an outdoor heat exchanger, a throttling device, and an indoor heat exchanger. Therefore, the slave module 102 may include at least one compressor.

[0072] In this application, each slave module 102 executes the refrigeration cycle of the air conditioning system by using a compressor, condenser, electronic expansion valve, evaporator, and four-way valve as a refrigerant circulation loop. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0073] The compressor compresses refrigerant gas under high temperature and pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0074] The electronic expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the electronic expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled.

[0075] Figure 2 This is a schematic diagram of the structure of an air conditioning system provided in accordance with an exemplary embodiment of this application. Figure 2 As shown, the air conditioning system 200 includes a main water inlet pipe 201, a main water outlet pipe 202, sub-water inlet pipes 203 and sub-water outlet pipes 204 for each slave module 102, and a controller 205. Figure 2 (Not shown in the image).

[0076] In some embodiments, the sub-inlet pipes 203 of each slave module 102 are connected to the main inlet pipe 201, and the sub-outlet pipes 204 of each slave module 102 are connected to the main outlet pipe 202. The sub-inlet pipes 203 and sub-outlet pipes 204 are pipes for circulating water, used to introduce water sources and to export circulating water that has undergone heat exchange.

[0077] In some embodiments, the controller 205 is used to determine energy demand parameters based on the current water temperature and target water temperature of the main water pipeline; and to determine the target total frequency of the compressor based on the energy demand parameters and the normalization parameters, wherein the normalization parameters are used to normalize the fixed-frequency compressor and the variable-frequency compressor into a standard compressor.

[0078] Based on the parameters and normalized parameters of the currently operating compressors, determine the total frequency of the currently operating compressors. The parameters of the currently operating compressors include the number of currently operating fixed-frequency compressors and the number of currently operating variable-frequency compressors. Based on the target total frequency of the compressors and the total frequency of the currently operating compressors, adjust the operating strategy of the air conditioning system. The operating strategy includes one or more of the following: the number of operating fixed-frequency compressors, the number of operating variable-frequency compressors, and the operating frequency of the variable-frequency compressors.

[0079] Optionally, the controller 205 is specifically used to determine a first quantity based on the capacity coefficient of each fixed-frequency compressor, the first quantity being the total number of fixed-frequency compressors normalized to standard compressors; to determine a second quantity based on the capacity coefficient of each variable-frequency compressor, the second quantity being the total number of variable-frequency compressors normalized to standard compressors; and to determine the target total frequency of the compressors based on the first quantity, the second quantity, the frequency of the standard compressors, and the energy demand parameters.

[0080] Optionally, the controller 205 is specifically used to determine the total frequency of the currently operating compressors based on the number of currently operating fixed-frequency compressors, the number of currently operating variable-frequency compressors, and the standard compressor frequency.

[0081] Optionally, the controller 205 is specifically used to adjust the number of variable frequency compressors in operation to be above the number of currently operating variable frequency compressors when the target total frequency of the compressor is above the total frequency of the currently operating compressors.

[0082] Optionally, the controller 205 is specifically used to adjust the number of fixed-frequency compressors in operation based on the target total frequency of the compressor, the standard total frequency of the compressor, and the number of variable frequency compressors currently in operation, when the target total frequency of the compressor is above the current total frequency of the operating compressors, such that the number of fixed-frequency compressors in operation is above the current number of fixed-frequency compressors.

[0083] Optionally, when the target total frequency of the compressor is above the total frequency of the currently operating compressor, the controller 205 is specifically used to adjust the number of fixed-frequency compressors in operation when the target total frequency of the compressor is below the standard compressor total frequency and the number of currently operating variable frequency compressors is below the total number of variable frequency compressors. The number of fixed-frequency compressors in operation is the same as the number of currently operating fixed-frequency compressors.

[0084] Adjust the operating frequency of the variable frequency compressor to the first preset frequency, which is the optimal operating frequency of the variable frequency compressor.

[0085] If the target total frequency of the compressor is below the standard total frequency of the compressor, and the number of variable frequency compressors currently in operation is the same as the total number of variable frequency compressors, adjust the number of fixed frequency compressors in operation so that the number of fixed frequency compressors in operation is the same as the number of fixed frequency compressors currently in operation.

[0086] Adjust the operating frequency of the variable frequency compressor to the second preset frequency, which is different from the first preset frequency.

[0087] If the target total frequency of the compressor is above the standard total frequency of the compressor, adjust the number of fixed-frequency compressors in operation so that the number of fixed-frequency compressors in operation is above the number of currently operating fixed-frequency compressors.

[0088] The operating frequency of the variable frequency compressor is adjusted to the third preset frequency, which is different from the first and second preset frequencies.

[0089] Optionally, the controller 205 is specifically used to adjust the number of fixed-frequency compressors when the target total frequency of the compressor is below the total frequency of the currently operating compressors, wherein the number of fixed-frequency compressors is below the number of currently operating fixed-frequency compressors.

[0090] Optionally, if the target total frequency of the compressor is below the total frequency of the currently operating compressor, the controller 205 is specifically used to adjust the number of fixed-frequency compressors in operation to 0 when the target total frequency of the compressor is below the standard total frequency of the compressor.

[0091] If the difference between the target total frequency of the compressor and the standard total frequency of the compressor is below the target threshold, reduce the number of currently operating fixed-frequency compressors.

[0092] If the difference between the target total frequency of the compressor and the standard total frequency of the compressor is above the target threshold, reduce the operating frequency of the currently operating variable frequency compressor.

[0093] Optionally, the controller 205 is specifically used to maintain the operating strategy unchanged when the target total frequency of the compressor is the same as the total frequency of the currently operating compressor.

[0094] In some embodiments, controller 205 refers to a device that can generate operation control signals according to instruction opcodes and timing signals, instructing the air conditioning system 100 to execute control instructions. Exemplarily, controller 205 can be a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller can also be other devices with processing functions, such as circuits, devices, or software modules; this application embodiment does not impose any limitations on this.

[0095] In some embodiments, the controller 205 can be a microcontroller unit (MCU). An MCU, also known as a single-chip microcomputer, is a chip-level computer that integrates a central processing unit (CPU) with appropriately reduced frequency and specifications, along with peripheral interfaces such as memory, timer, USB, A / D converter, UART, PLC, DMA, and even LCD driver circuitry, all onto a single chip. This allows for different combinations of control for various applications.

[0096] In addition, the controller 205 can be used to control the operation of various components inside the air conditioning system 100 so that the operation of each component of the air conditioning system 100 can realize the predetermined functions of the air conditioning system 100.

[0097] Figure 3 This is a hardware configuration block diagram of an air conditioning system provided in accordance with an exemplary embodiment of this application. Figure 3 As shown, the air conditioning system 100 includes a temperature sensor 301, a communicator 302, and a memory 303.

[0098] In some embodiments, a temperature sensor 301 is disposed at the main water outlet pipe 202 to obtain the temperature of the main water outlet pipe.

[0099] In some embodiments, the communicator 302 is used to establish communication connections with other network entities. The communicator 302 may include a radio frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, and a GPS module, etc. Taking an RF module as an example, the RF module can be used for signal reception and transmission; specifically, it sends received information to the controller 205 for processing; additionally, it transmits signals generated by the controller 205. Typically, the RF circuit may include, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier (LNA), a duplexer, etc.

[0100] In some embodiments, memory 303 may be used to store software programs and data, including data configuring an electronic device to at least one new firmware version. Processor 301 executes various functions of the air conditioning system 100 and performs data processing by running the software programs or data stored in memory 303. Memory 303 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. In this application, memory 303 may store an operating system and various application programs, and may also store code that executes the control method of the air conditioning system provided in the embodiments of this application.

[0101] It is understood that the structures illustrated in the embodiments of the present invention do not constitute a specific limitation on the air conditioning system. In other embodiments of this application, the air conditioning system may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0102] The embodiments provided in this application will now be described in detail with reference to the accompanying drawings.

[0103] like Figure 4 As shown in the figure, this application provides a control method for an air conditioning system, applied to the controller of a modular control system. The method includes the following steps:

[0104] S1. Determine the energy demand parameters based on the current water temperature and target water temperature in the main water pipeline.

[0105] Optionally, energy demand parameters are usually expressed as a percentage. For example, if the energy demand parameter is 50%, it means that the air conditioning system needs to operate at 50% of its rated capacity.

[0106] In some embodiments, the energy demand parameters of the air conditioning system are determined based on one of the total inlet water temperature of the main inlet pipe, the total outlet water temperature of the main outlet pipe, and a set target temperature.

[0107] For example, such as Figure 5 As shown, the steps for determining the energy demand parameters of an air conditioning system may include the following steps a1-a5.

[0108] Step a1: The controller acquires the set target temperature and target temperature control mode. The target temperature control mode includes either the inlet water temperature control mode or the outlet water temperature control mode.

[0109] Step a2: The controller determines the difference between the current target total water pipeline temperature and the target temperature based on the target temperature control method.

[0110] In some embodiments, when the target temperature control method is the inlet water temperature control method, the target total water pipeline temperature is the total inlet water temperature.

[0111] When the target temperature control mode is the outlet water temperature control mode, the target total water pipeline temperature is the total outlet water temperature.

[0112] Step a3: The controller determines the rate of change of temperature difference based on the temperature difference between the current target total water pipeline temperature and the target temperature and the temperature difference between the target total water pipeline temperature and the target temperature at the previous time.

[0113] Step a4: The controller determines the energy regulation change based on the temperature difference between the current target total water pipeline temperature and the target temperature, and the rate of change of the temperature difference.

[0114] In one possible implementation, the controller can determine the energy regulation change by looking up a table based on the temperature difference between the current target total water pipe temperature and the target temperature, and the rate of change of the temperature difference.

[0115] In another possible implementation, the controller can determine the energy regulation change based on a fitted calculation formula between the temperature difference between the current target total water pipe temperature and the target temperature and the rate of change of the temperature difference.

[0116] Step a5: The controller determines the energy demand parameters of the air conditioning system based on the change in energy regulation and the energy demand parameters of the air conditioning system at the previous moment.

[0117] In one example, the energy demand parameters of the air conditioning system can be obtained from the following formula (1):

[0118] p(n)=p(n-1)+Δp Formula (1)

[0119] Where p(n) is the energy demand parameter of the air conditioning system; p(n-1) is the energy demand parameter of the air conditioning system at the previous moment; and Δp is the change in energy regulation.

[0120] In another example, the controller can determine the change in energy regulation by looking up a table based on the change in energy regulation and the energy demand parameters of the air conditioning system at the previous moment.

[0121] S2. Determine the target total frequency of the compressor based on the energy demand parameters and normalized parameters.

[0122] The normalization parameter is used to normalize fixed-frequency compressors and variable-frequency compressors to the standard compressor standard. The normalization parameter may include the capacity coefficient Ca(n) and the standard compressor frequency CP, with one capacity coefficient corresponding to one compressor.

[0123] Optionally, the capacity factor is the ratio of the compressor capacity to the standard compressor capacity. The capacity factor and the standard compressor frequency can be customized parameters based on a large number of experimental results.

[0124] For example, if the capacity factor of a 25-horsepower compressor is set to 2, then one 25-horsepower compressor can be normalized to two standard compressors; if the capacity factor of a 12-horsepower compressor is set to 1, then one 12-horsepower compressor can be normalized to one standard compressor.

[0125] In some embodiments, such as Figure 6 As shown, step S2 above can be specifically implemented as the following steps S21-S23:

[0126] S21. Determine the first quantity based on the capacity coefficient of each fixed-frequency compressor.

[0127] The first quantity is the total number of fixed-frequency compressors normalized to standard compressors.

[0128] Optionally, the first quantity is the sum of the capacity coefficients of each fixed-frequency compressor.

[0129] S22. Determine the second quantity based on the capacity coefficient of each variable frequency compressor.

[0130] The second quantity is the total number of variable frequency compressors normalized to standard compressors.

[0131] Optionally, the second quantity is the sum of the capacity coefficients of each variable frequency compressor.

[0132] S23. Determine the target total frequency of the compressor based on the first quantity, the second quantity, the standard compressor frequency, and the energy demand parameters.

[0133] For example, such as Figure 7 As shown, determining the target total frequency of the compressor may include the following steps:

[0134] Step b1: Multiply the first quantity by the standard compressor frequency to obtain the total frequency of the standard fixed-frequency compressor.

[0135] Step b2: Multiply the second quantity by the standard compressor frequency to obtain the total frequency of the standard variable frequency compressor.

[0136] Step b3: Add the total frequency of the standard fixed-frequency compressor and the total frequency of the standard variable-frequency compressor to obtain the total frequency of the standard compressor.

[0137] Step b4: Multiply the standard compressor total frequency and the energy demand parameter to obtain the compressor target total frequency.

[0138] That is, the target total frequency of the compressor can be determined by the following formula (2):

[0139] M(n)=[S(c)*Cp+S(v)*Cp]*p(n) Formula (2)

[0140] Where M(n) is the target total frequency of the compressor; S(c) is the first quantity; S(v) is the second quantity; Cp is the standard compressor frequency; and p(n) is the energy demand parameter.

[0141] As can be seen from the above embodiments, this application normalizes fixed-frequency compressors and variable-frequency compressors into standard compressors, determines the target number and operating frequency of the standard compressors to be adjusted according to their operating frequencies, and then determines the number of fixed-frequency compressors and variable-frequency compressors to be operated based on the required number and operating frequencies of the standard compressors to be adjusted. In this way, the target total frequency of the compressors determined based on the first and second normalized numbers is more accurate, resulting in more precise adjustment of the air conditioning system.

[0142] S3. Determine the total frequency of the currently operating compressor based on the parameters and normalized parameters of the currently operating compressor.

[0143] The parameters of the currently operating compressor may include one or more of the following: the number of currently operating fixed-frequency compressors, the number of currently operating variable-frequency compressors, and the operating frequency of the currently operating variable-frequency compressors.

[0144] In some embodiments, step S3 above can be specifically implemented as determining the total frequency of the currently operating compressors based on the number of currently operating fixed-frequency compressors, the number of currently operating variable-frequency compressors, and the standard compressor frequency.

[0145] For example, such as Figure 8 As shown, determining the total frequency of the currently operating compressor may include the following steps:

[0146] Step c1: Multiply the number of currently running fixed-frequency compressors, the standard compressor frequency, and the capacity coefficient to obtain the frequency of the currently running fixed-frequency compressors.

[0147] Step c2: Multiply the number of currently operating variable frequency compressors, the standard compressor frequency, and the capacity coefficient to obtain the frequency of the currently operating variable frequency compressors.

[0148] Step c3: Add the frequency of the currently running fixed-frequency compressor and the frequency of the currently running variable-frequency compressor to obtain the total frequency of the currently running compressor.

[0149] As can be seen from the above embodiments, this application normalizes fixed-frequency compressors and variable-frequency compressors into standard compressors, determines the target number and operating frequency of the standard compressors to be adjusted according to their operating frequencies, and then determines the number of fixed-frequency compressors and variable-frequency compressors to be operated based on the required number of standard compressors to be adjusted and their operating frequencies. This allows for more precise adjustment of the air conditioning system.

[0150] It is understood that step S3 can be executed before step S2, after step S2, or simultaneously with step S2. This application embodiment does not specifically limit the execution order of step S2 and step S3.

[0151] S4. Adjust the operating strategy of the air conditioning system according to the target total frequency of the compressor and the current total frequency of the operating compressor.

[0152] The operating strategy of the air conditioning system may include one or more of the following: the number of fixed-frequency compressors in operation, the number of variable-frequency compressors in operation, and the operating frequency of the variable-frequency compressors.

[0153] In some embodiments, when the target total frequency of the compressor is above the total frequency of the currently operating compressors, the number of variable frequency compressors in operation is adjusted to be above the number of currently operating variable frequency compressors.

[0154] Optionally, if the target total frequency of the compressor is above the total frequency of the currently operating compressor, the number of fixed-frequency compressors in operation is adjusted to be above the number of currently operating fixed-frequency compressors based on the target total frequency of the compressor, the standard total frequency of the compressor, and the number of currently operating variable-frequency compressors.

[0155] For example, the total frequency of a standard compressor can be determined by the product of the number of standard variable frequency compressors and the equivalent operating frequency of the standard variable frequency compressors compared to the fixed frequency compressors. The number of standard variable frequency compressors and the equivalent operating frequency of the standard variable frequency compressors compared to the fixed frequency compressors can be obtained through extensive experiments.

[0156] Because variable frequency compressors operate at lower frequencies when the air conditioning system load is low, their energy efficiency is significantly higher than that of fixed frequency compressors; conversely, when the air conditioning system load is high, variable frequency compressors operate at higher frequencies, resulting in lower energy efficiency than fixed frequency compressors. When the target total frequency of the compressors is above the current operating total frequency, it indicates that the air conditioning system load demand is low. Therefore, this application proposes increasing the number of variable frequency compressors in operation to further improve the efficiency of the air conditioning system.

[0157] As one possible implementation, when the target total frequency of the compressor is below the standard total frequency of the compressor and the number of currently operating variable frequency compressors is below the total number of variable frequency compressors, the number of operating fixed frequency compressors is adjusted to the number of currently operating fixed frequency compressors; the operating frequency of the variable frequency compressor is adjusted to a first preset frequency, which is the optimal operating frequency of the variable frequency compressor.

[0158] For example, the number of variable frequency compressors in operation is adjusted to be one more than the number of variable frequency compressors currently in operation; the operating frequency of the previously operating variable frequency compressors is adjusted to the optimal operating frequency; and the frequency of the newly operating variable frequency compressors is adjusted to the fourth preset frequency.

[0159] The fourth preset frequency can be determined by the following formula (3):

[0160] [M(n)-NV(0)*M(s)] / Ca(nl) Formula (3)

[0161] Where M(n) is the target total frequency of the compressor; NV(0) is the number of currently operating standard variable frequency compressors; M(s) is the optimal operating frequency of the variable frequency compressor; and Ca(nx) is the capacity coefficient of the newly operating variable frequency compressor.

[0162] As another possible implementation, when the target total frequency of the compressor is below the standard total frequency of the compressor, and the number of currently operating variable frequency compressors is the same as the total number of variable frequency compressors, the number of operating fixed frequency compressors is adjusted to the number of currently operating fixed frequency compressors; the operating frequency of the variable frequency compressor is adjusted to a second preset frequency, which is different from the first preset frequency.

[0163] For example, the second preset frequency can be determined by the following formula (4):

[0164] M(n) / S(v) Formula (4)

[0165] Where M(n) is the target total frequency of the compressor; S(v) is the second quantity.

[0166] As another possible implementation, when the target total frequency of the compressor is above the standard total frequency of the compressor, the number of fixed-frequency compressors in operation is adjusted to be above the number of currently operating fixed-frequency compressors; the operating frequency of the variable-frequency compressor is adjusted to a third preset frequency, which is different from the first preset frequency and the second preset frequency.

[0167] For example, the number of fixed-frequency compressors in operation is adjusted to be one more than the number of currently operating fixed-frequency compressors, and the newly operating fixed-frequency compressor is the one with the shortest cumulative running time among the fixed-frequency compressors that have not been started; the operating frequency of the previously operating variable-frequency compressors is adjusted to a third preset frequency.

[0168] For example, the third preset frequency can be determined by the following formula (5):

[0169] (M(n)-Ca(n)*Cp) / S(v) Formula (5)

[0170] Where M(n) is the target total frequency of the compressor; Ca(n) is the capacity coefficient; Cp is the standard compressor frequency; and S(v) is the second quantity.

[0171] The following describes six scenarios where the target total frequency of the compressor is above the current operating total frequency of the compressor, along with the corresponding operating strategies for each scenario:

[0172] Where M(n) is the target total frequency of the compressor; M(0) is the total frequency of the currently running compressor; M(vc) is the total frequency of the standard compressor; NV(0) is the number of currently running standard variable frequency compressors; M(s) is the optimal operating efficiency of the variable frequency compressor; Ca(n) is the capacity coefficient; Ca(nl) is the capacity coefficient of the variable frequency compressor with the longest cumulative running time among the currently running variable frequency compressors;

[0173] Scenario 1: M(vc)≥M(n)>M(0), M(n) / NV(0)>M(s) and not all variable frequency compressors in the current air conditioning system are running (the number of currently running variable frequency compressors is less than the total number of variable frequency compressors).

[0174] Adjustment Strategy 1: Adjust the number of variable frequency compressors in operation to be one more than the number of variable frequency compressors currently in operation; adjust the operating frequency of the previously running variable frequency compressors to the optimal operating frequency M(s); adjust the frequency of the newly running variable frequency compressors to the fourth preset frequency, where the fourth preset frequency can be determined by formula (3) above, and will not be repeated here.

[0175] Scenario 2: M(vc)≥M(n)>M(0), M(n) / NV(0)>M(s) and all variable frequency compressors in the current air conditioning system are running (the number of currently running variable frequency compressors is the same as the total number of variable frequency compressors).

[0176] Adjustment Strategy 2: Adjust all variable frequency compressors in the air conditioning system to operate at the second preset frequency, where the second preset frequency can be determined by formula (4) above, and will not be repeated here.

[0177] Case 3: M(vc)≥M(n)>M(0) and M(n) / NV(0)≤M(s).

[0178] Adjustment Strategy 3: Adjust the frequency of the variable frequency compressor with the longest cumulative running time among the running variable frequency compressors to the fifth preset frequency, and adjust the operating frequency of the remaining variable frequency compressors to the optimal operating frequency M(s);

[0179] For example, the third preset frequency can be determined by the following formula (6):

[0180] (M(n)-(NV(0)-Ca(nl)*M(s)) / Ca(nl) Formula (6)

[0181] Case 4: M(n)>M(0), M(vc)-M(n)≤S(c)*Cp, and (M(n)-Ca(n)*Cp)>M(vc).

[0182] Adjustment Strategy 4: Increase the number of fixed-frequency compressors in operation until (M(n)-[Ca(nx)+Ca(n)]*Cp)≤M(vc), while controlling the already running variable-frequency compressors to operate at the frequencies specified in Adjustment Strategy 1 to Adjustment Strategy 3.

[0183] Case 5: M(n)>M(0), M(vc)-M(n)≤S(c)*Cp, and (M(n)-Ca(n)*Cp)≤M(vc).

[0184] Adjustment Strategy 5: Adjust the number of fixed-frequency compressors in operation to be one more than the current number of fixed-frequency compressors in operation, and at the same time control the already running variable-frequency compressors to operate at the frequencies specified in Adjustment Strategy 1 to Adjustment Strategy 3.

[0185] Case 6: M(n) > M(0) and M(vc) - M(n) > S(c) * Cp.

[0186] Adjustment Strategy Six: Adjust all fixed-frequency compressors to run at a constant speed, and adjust the operating frequency of the already running variable-frequency compressors to the third preset frequency. The third preset frequency can be determined by formula (5) above, which will not be repeated here.

[0187] In some embodiments, when the target total frequency of the compressor is below the total frequency of the currently operating compressor, the number of fixed-frequency compressors is adjusted to be below the number of currently operating fixed-frequency compressors.

[0188] As can be seen from the above embodiments, when the target total frequency of the compressor is below the current operating total frequency of the compressor, it indicates that the load demand of the air conditioning system is relatively small. In this regard, this application can improve the efficiency of the air conditioning system by reducing the number of fixed-frequency compressors in operation.

[0189] As one possible implementation, when the target total frequency of the compressor is below the standard total frequency of the compressor, the number of fixed-frequency compressors in operation is adjusted to 0.

[0190] As another possible approach, if the difference between the target total frequency of the compressor and the standard total frequency of the compressor is below the target threshold, the number of currently operating fixed-frequency compressors can be reduced.

[0191] Optionally, the target threshold can be the product of a first quantity and the standard compressor frequency.

[0192] For example, when the difference between the target total frequency of the compressor and the standard total frequency of the compressor is below the target threshold, the fixed-frequency compressor with the longest cumulative running time among the currently running fixed-frequency compressors is controlled.

[0193] As another possible implementation, if the difference between the target total frequency of the compressor and the standard total frequency of the compressor is above the target threshold, the operating frequency of the currently operating variable frequency compressor is reduced.

[0194] Optionally, the target threshold can be the product of a first quantity and the standard compressor frequency.

[0195] For example, if the difference between the target total frequency of the compressor and the standard total frequency of the compressor is above the target threshold, the operating frequency of the currently running variable frequency compressor is adjusted to the sixth preset frequency.

[0196] The sixth preset frequency can be determined by the following formula (7):

[0197] [M(n)-S(c)*Cp] / S(v) Formula (7)

[0198] Where M(n) is the target total frequency of the compressor; S(c) is the first quantity; Cp is the standard compressor frequency; and S(v) is the second quantity.

[0199] The following describes six scenarios where the compressor's target total frequency is below the current operating compressor's total frequency, along with the corresponding operating strategies for each scenario:

[0200] Case 7: M(n) < M(0), (M(n) / NV(0)-Ca(nl)) ≥ M(s).

[0201] Adjustment Strategy Seven: Stop all fixed-frequency compressors from running (set the number of running fixed-frequency compressors to 0), and at the same time control the already running variable-frequency compressors to run at the frequencies specified in Adjustment Strategy One to Adjustment Strategy Three.

[0202] Case 8: M(n) < M(0), (M(n) / NV(0)-Ca(nl)) < M(s), and M(n) / [NV(0)-Ca(nl)] ≥ M(s).

[0203] Adjustment Strategy 8: Stop all fixed-frequency compressors (set the number of fixed-frequency compressors in operation to 0), adjust the variable-frequency compressor with the longest cumulative running time among the currently running variable-frequency compressors to run at the seventh preset frequency, and at the same time adjust the operating frequency of the remaining variable-frequency compressors to the optimal operating frequency M(s).

[0204] The seventh preset frequency can be determined by the following formula (8):

[0205] [M(n)-(NV(0)-Ca(nl))*M(s)] / Ca(nl) Formula (8)

[0206] Case 9: M(n) < M(0), (M(n) / NV(0)-Ca(nl)) < M(s), and M(n) / [NV(0)-Ca(nl)] < M(s).

[0207] Adjustment Strategy Nine: Control all fixed-frequency compressors to stop running (adjust the number of fixed-frequency compressors in operation to 0), shut down the variable-frequency compressor with the longest cumulative running time among the currently running variable-frequency compressors, and repeat the judgment in Situation Eight above.

[0208] Case 10: M(n) < M(0), M(vc) < M(n), M(n) - M(vc) ≤ S(C) * Cp, [M(0) - Ca(n) * Cp] > M(n), and [M(0) - (Ca(nx) + Ca(n)) * Cp] ≤ M(n).

[0209] Adjustment Strategy 10: Shut down the fixed-frequency compressor with the longest cumulative running time among the currently running fixed-frequency compressors, and at the same time control the already running variable-frequency compressors to run at the frequencies specified in Adjustment Strategy 7 to Adjustment Strategy 9.

[0210] Case 11: M(n) < M(0), M(vc) < M(n), M(n) - M(vc) ≤ +S(C)*Cp, [M(0) - Ca(n)*Cp] > M(n), and [M(0) - (Ca(nx) + Ca(n))*Cp] > M(n).

[0211] Adjustment Strategy Eleven: Shut down the fixed-frequency compressor with the longest cumulative running time among the currently running fixed-frequency compressors, and repeat the judgment in Scenario Ten above.

[0212] Case 12: M(n) < M(0), M(n) - M(vc) > S(C)*Cp.

[0213] Adjustment Strategy Twelve: Adjust the operating frequency of the currently running variable frequency compressor to the sixth preset frequency, where the sixth preset frequency can be determined by formula (7) above, which will not be repeated here.

[0214] In some embodiments, the operating strategy remains unchanged when the target total frequency of the compressor is equal to the total frequency of the currently operating compressor.

[0215] As can be seen from the above embodiments, when the target total frequency of the compressor is equal to the total frequency of the currently operating compressor, it means that the current load of the air conditioning system just meets the usage requirements, and there is no need to change the operating strategy of the air conditioning system.

[0216] Figure 4 The illustrated embodiments offer at least the following advantages: This application normalizes fixed-frequency compressors and variable-frequency compressors into standard compressors, determines the target number and operating frequency of the standard compressors to be adjusted according to their operating frequencies, and then determines the number of fixed-frequency compressors, the number of variable-frequency compressors, and their operating frequencies based on the required number and operating frequencies of the standard compressors to be adjusted. This allows for more precise adjustment of the air conditioning system.

[0217] Secondly, this application adjusts the operating strategy of the air conditioning system based on the target total frequency of the compressor and the current total frequency of the operating compressor, which can optimize the operating efficiency of the air conditioning system.

[0218] The following is combined with, for example Figure 9 The embodiments shown exemplify the complete flow of a control method for an air conditioning system.

[0219] like Figure 9 As shown, the process begins.

[0220] Step d1: The controller obtains the current water temperature and target water temperature of the main water pipeline.

[0221] Step d2: The controller determines the energy demand parameters based on the current water temperature and the target water temperature.

[0222] Step d3: The controller determines the total frequency M(n) of the target compressor and the total frequency M(0) of the currently running compressor based on the energy demand parameters, normalized parameters and parameters of the currently running compressor.

[0223] Step d4: If M(n) > M(0), adjust the number of variable frequency compressors in operation so that the number of variable frequency compressors in operation is greater than the number of variable frequency compressors currently in operation.

[0224] Step d5: If M(n) < M(0), adjust the number of fixed-frequency compressors so that the number of fixed-frequency compressors is below the number of currently running fixed-frequency compressors.

[0225] Step d6: If M(n) = M(0), maintain the operating strategy unchanged.

[0226] The following is combined with, for example Figure 10 The illustrated embodiment provides another example of the control method for an air conditioning system.

[0227] like Figure 10 As shown, the process begins.

[0228] Step e1: The controller obtains the current water temperature and target water temperature of the main water pipeline.

[0229] Step e2: The controller determines the energy demand parameters based on the current water temperature and the target water temperature.

[0230] Step e3: Equip the target total frequency of the compressor to the total frequency of the standard compressor based on the energy demand parameters.

[0231] Step e4: Determine the number of fixed-frequency compressors in operation, the number of variable-frequency compressors in operation, and the operating frequency of the variable-frequency compressors based on the total frequency of the standard compressors.

[0232] Step e5: Adjust the number of fixed-frequency compressors in operation, the number of variable-frequency compressors in operation, and the operating frequency of the variable-frequency compressors.

[0233] As can be seen, the above mainly describes the solutions provided by the embodiments of this application from a methodological perspective. To achieve the above functions, the embodiments of this application provide corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should readily recognize that, in conjunction with the modules and algorithm steps of the various examples described in the embodiments disclosed herein, the embodiments of this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention.

[0234] This application embodiment can divide the controller into functional modules according to the above method example. For example, each function can be divided into a separate functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. Optionally, the module division in this application embodiment is illustrative and only represents one logical functional division; other division methods may be used in actual implementation.

[0235] This application also provides a computer-readable storage medium including computer-executable instructions that, when run on a computer, cause the computer to execute any of the air conditioning system control methods provided in the above embodiments.

[0236] This application also provides a computer program product containing computer execution instructions, which, when run on a computer, causes the computer to execute any of the air conditioning system control methods provided in the above embodiments.

[0237] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software programs, implementation can be, in whole or in part, in the form of a computer program product. This computer program product includes one or more computer-executable instructions. When these computer-executable instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer-executable instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer-executable instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device containing one or more servers, data centers, etc., that can be integrated with the medium. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state disks, SSDs).

[0238] Although this application has been described herein in conjunction with various embodiments, those skilled in the art, by reviewing the accompanying drawings, disclosure, and appended claims, will understand and implement other variations of the disclosed embodiments in carrying out the claimed application. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple instances. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

[0239] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely illustrative descriptions of the application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from the spirit and scope of this application. Thus, if such modifications and modifications of this application fall within the scope of the claims of this application and their equivalents, this application is also intended to include such modifications and modifications.

[0240] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An air conditioning system, characterized in that, include: At least one fixed-frequency module, wherein the fixed-frequency module includes a fixed-frequency compressor; At least one frequency converter module, wherein the frequency converter module includes a frequency converter compressor; The main water pipeline is connected to the water pipelines of the at least one fixed-frequency air-cooled module and the at least one variable-frequency air-cooled module; A controller, electrically connected to the at least one fixed-frequency module and the at least one variable-frequency module, is configured to: Based on the current water temperature and target water temperature of the main water pipeline, determine the energy demand parameters; The target total frequency of the compressor is determined based on the energy demand parameters and the normalization parameters. The normalization parameters are used to normalize the fixed-frequency compressor and the variable-frequency compressor into a standard compressor. Based on the parameters of the currently operating compressor and the normalized parameters, the total frequency of the currently operating compressor is determined. The parameters of the currently operating compressor include the number of currently operating fixed-frequency compressors and the number of currently operating variable-frequency compressors. The operating strategy of the air conditioning system is adjusted based on the target total frequency of the compressor and the total frequency of the currently operating compressor. The operating strategy includes one or more of the following: the number of fixed-frequency compressors in operation, the number of variable-frequency compressors in operation, and the operating frequency of the variable-frequency compressors.

2. The air conditioning system according to claim 1, characterized in that, The normalized parameters include a capacity factor and a standard compressor frequency. The capacity factor is the ratio of the compressor capacity to the standard compressor capacity, and one compressor corresponds to one capacity factor. The controller executes the process of determining the target total frequency of the compressor based on the energy demand parameters and normalized parameters, specifically configured as follows: A first quantity is determined based on the capacity coefficient of each of the fixed-frequency compressors, where the first quantity is the total number of fixed-frequency compressors normalized to the standard compressors; A second quantity is determined based on the capacity coefficient of each of the variable frequency compressors, the second quantity being the total number of the variable frequency compressors normalized to the standard compressors; The target total frequency of the compressor is determined based on the first quantity, the second quantity, the standard compressor frequency, and the energy requirement parameters.

3. The air conditioning system according to claim 1, characterized in that, The controller performs the step of determining the total frequency of the currently operating compressor based on the parameters of the currently operating compressor and the normalized parameters, specifically configured as follows: The total frequency of the currently operating compressors is determined based on the number of currently operating fixed-frequency compressors, the number of currently operating variable-frequency compressors, and the standard compressor frequency.

4. The air conditioning system according to claim 1, characterized in that, The controller executes the operation strategy of adjusting the air conditioning system based on the target total frequency of the compressor and the current total frequency of the operating compressor, specifically configured as follows: When the target total frequency of the compressor is higher than the total frequency of the currently operating compressor, the number of operating variable frequency compressors is adjusted to be higher than the number of currently operating variable frequency compressors.

5. The air conditioning system according to claim 4, characterized in that, The controller is also configured to: Based on the target total frequency of the compressor, the standard total frequency of the compressor, and the number of currently operating variable frequency compressors, the number of operating fixed frequency compressors is adjusted, and the number of operating fixed frequency compressors is greater than the number of currently operating fixed frequency compressors.

6. The air conditioning system according to claim 5, characterized in that, The controller performs the function of adjusting the number of fixed-frequency compressors in operation based on the target total frequency of the compressors, the standard total frequency of the compressors, and the number of currently operating variable-frequency compressors. Specifically, this is configured as follows: When the target total frequency of the compressor is below the total frequency of the standard compressor, and the number of currently operating variable frequency compressors is below the total number of variable frequency compressors, the number of operating fixed frequency compressors is adjusted to be the same as the number of currently operating fixed frequency compressors. The operating frequency of the variable frequency compressor is adjusted to a first preset frequency, which is the optimal operating frequency of the variable frequency compressor. When the target total frequency of the compressor is below the total frequency of the standard compressor, and the number of currently operating variable frequency compressors is the same as the total number of variable frequency compressors, the number of operating fixed frequency compressors is adjusted to be the same as the number of currently operating fixed frequency compressors. The operating frequency of the variable frequency compressor is adjusted to a second preset frequency, which is different from the first preset frequency; When the target total frequency of the compressor is above the total frequency of the standard compressor, the number of fixed-frequency compressors in operation is adjusted to be above the number of currently operating fixed-frequency compressors. The operating frequency of the variable frequency compressor is adjusted to a third preset frequency, which is different from the first preset frequency and the second preset frequency.

7. The air conditioning system according to claim 1, characterized in that, The controller executes the operation strategy of adjusting the air conditioning system based on the target total frequency of the compressor and the current total frequency of the operating compressor, specifically configured as follows: If the target total frequency of the compressor is below the total frequency of the currently operating compressor, the number of the fixed-frequency compressors is adjusted, where the number of fixed-frequency compressors is below the number of currently operating fixed-frequency compressors.

8. The air conditioning system according to claim 7, characterized in that, When the target total frequency of the compressor is below the total frequency of the currently operating compressor, the controller performs the adjustment of the number of fixed-frequency compressors, specifically configured as follows: When the target total frequency of the compressor is below the standard total frequency of the compressor, the number of operations of the fixed-frequency compressor is adjusted to 0. If the difference between the target total frequency of the compressor and the standard total frequency of the compressor is below the target threshold, the number of currently operating fixed-frequency compressors shall be reduced. If the difference between the target total frequency of the compressor and the standard total frequency of the compressor is above the target threshold, the operating frequency of the currently operating variable frequency compressor is reduced.

9. The air conditioning system according to claim 1, characterized in that, The controller executes the operation strategy of adjusting the air conditioning system based on the target total frequency of the compressor and the current total frequency of the operating compressor, specifically configured as follows: If the target total frequency of the compressor is the same as the total frequency of the currently operating compressor, the operating strategy remains unchanged.

10. A control method for an air conditioning system, characterized in that, The method includes: Determine the energy demand parameters based on the current water temperature and target water temperature in the main water pipeline; The target total frequency of the compressor is determined based on the energy demand parameters and the normalization parameters. The normalization parameters are used to normalize the fixed-frequency compressor and the variable-frequency compressor into a standard compressor. Based on the parameters of the currently operating compressor and the normalized parameters, the total frequency of the currently operating compressor is determined. The parameters of the currently operating compressor include the number of currently operating fixed-frequency compressors and the number of currently operating variable-frequency compressors. The operating strategy of the air conditioning system is adjusted based on the target total frequency of the compressor and the total frequency of the currently operating compressor. The operating strategy includes one or more of the following: the number of fixed-frequency compressors in operation, the number of variable-frequency compressors in operation, and the operating frequency of the variable-frequency compressors.

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