Air conditioning system and control method thereof

Abstract

The invention provides an air conditioning system and a control method thereof, particularly relates to the technical field of air conditioners, and aims to improve the operation efficiency of the air conditioning system. The air conditioning system comprises at least one fixed-frequency module, and the fixed-frequency module comprises a fixed-frequency compressor; the frequency conversion module comprises a frequency conversion compressor; a main water pipeline; the controller is configured to determine energy demand parameters according to the current water temperature and the target water temperature of the main water pipeline; determining the total target frequency of the compressor according to the energy demand parameter and the normalization parameter; determining the total frequency of the currently running compressor according to the parameters of the currently running compressor and the normalized parameters; and adjusting the operation strategy of the air conditioning system according to the compressor target total frequency and the current operation compressor total frequency.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to an air conditioning system and a control method thereof. Background Art

[0002] Currently, modular air conditioning systems are commonly used in central air conditioning to regulate indoor temperatures. These systems can be either air-cooled or water-cooled. Due to the limited load capacity of a single module, multiple modules are often used to meet the load requirements of the air conditioning system. Furthermore, with the advancement of variable-frequency technology, modular air conditioning systems often utilize 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 assembly must be adjusted in real time to meet usage requirements. In related technologies, the load control of the variable frequency modules in the module assembly typically uses the control logic of the fixed frequency module. As a result, in actual applications, the fixed frequency module and the variable frequency module may operate simultaneously, or some variable frequency modules may operate at full load while others are not. This results in poor overall energy efficiency of the air conditioning system and wastes resources.

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

[0005] The embodiments of the present application provide an air-conditioning system and a control method thereof, which are used to improve the operating efficiency of the air-conditioning system.

[0006] To achieve the above objectives, the present invention adopts 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 frequency conversion module, the frequency conversion module including a frequency conversion compressor;

[0010] A main water pipeline connected to the water pipes of at least one fixed-frequency air-cooling module and at least one variable-frequency air-cooling module;

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

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

[0013] Determining the target total frequency of the compressor according to the energy demand parameter and the normalization parameter, wherein the normalization parameter is used to normalize the fixed-frequency compressor and the variable-frequency compressor into a standard compressor;

[0014] Determine the total frequency of the currently running compressors according to the parameters of the currently running compressors and the normalized parameters, wherein the parameters of the currently running compressors include the number of the currently running fixed-frequency compressors and the number of the currently running variable-frequency compressors;

[0015] The operation strategy of the air-conditioning system is adjusted according to the target total frequency of the compressors and the total frequency of the currently operating compressors. The operation strategy includes one or more of the number of operating fixed-frequency compressors, the number of operating variable-frequency compressors, and the operating frequency of the variable-frequency compressors.

[0016] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects: First, the present application normalizes the fixed-frequency compressor and the variable-frequency compressor into a standard compressor through normalization parameters, which can make the determined compressor target total frequency and the current operating compressor total frequency more accurate, thereby making the adjustment of the air-conditioning system more precise.

[0017] Secondly, the present application adjusts the operating strategy of the air-conditioning system according to the target total frequency of the compressor (load demand) and the total frequency of the currently operating compressor, so as to optimize the operating efficiency of the air-conditioning system.

[0018] In some embodiments, the above-mentioned normalized parameters include a capacity coefficient and a standard compressor frequency. The above-mentioned capacity coefficient is the ratio of the compressor capacity to the standard compressor capacity, and one compressor corresponds to one capacity coefficient; the controller executes to determine the target total frequency of the compressor based on the energy demand parameter and the normalized parameter, and is specifically configured as follows: according to the capacity coefficient of each fixed-frequency compressor, a first quantity is determined, and the first quantity is the total number of fixed-frequency compressors normalized to standard compressors; according to the capacity coefficient of each variable-frequency compressor, a second quantity is determined, and the second quantity is the total number of variable-frequency compressors normalized to standard compressors; according to the first quantity, the second quantity, the standard compressor frequency and the energy demand parameter, the target total frequency of the compressor is determined.

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

[0020] In some embodiments, the controller determines the total frequency of the currently running compressor based on the parameters and normalized parameters of the currently running compressor, and is specifically configured to determine the total frequency of the currently running compressor based on the number of currently running fixed-frequency compressors, the number of currently running variable-frequency compressors and the standard compressor frequency.

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

[0022] In some embodiments, the controller executes an operation strategy to adjust the air-conditioning system according to the target total frequency of the compressor and the total frequency of the currently operating compressor, and is 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, and the number of operating variable-frequency compressors is higher than the number of currently operating variable-frequency compressors.

[0023] When the air conditioning system's load is light, the variable-frequency compressor runs at a lower frequency, making it significantly more energy-efficient than a fixed-frequency compressor. When the air conditioning system's load is heavy, the variable-frequency compressor runs at a higher frequency, making it less energy-efficient than a fixed-frequency compressor. When the target total compressor frequency is above the current total frequency of the operating compressors, it indicates a low load demand on the air conditioning system. Therefore, this application can improve the efficiency of the air conditioning system by increasing the number of operating variable-frequency compressors.

[0024] In some embodiments, the controller is further configured to adjust the number of running fixed-frequency compressors based on the target total frequency of the compressor, the standard total frequency of the compressor, and the number of currently running variable-frequency compressors, so that the number of running fixed-frequency compressors is greater than the number of currently running 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 as follows: when the target total frequency of the compressor is lower than the standard total frequency of the compressor and the number of currently operating variable-frequency compressors is lower than the total number of variable-frequency compressors, the controller adjusts the number of fixed-frequency compressors in operation to be the same as the number of currently operating fixed-frequency compressors; adjusts the operating frequency of the variable-frequency compressor 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 lower than 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 controller adjusts the number of fixed-frequency compressors in operation to be the same as the number of currently operating fixed-frequency compressors; adjusts the operating frequency of the variable-frequency compressor to a second preset frequency, which is different from the first preset frequency; when the target total frequency of the compressor is higher than the standard total frequency of the compressor, the controller adjusts the number of fixed-frequency compressors in operation to be higher than the number of currently operating fixed-frequency compressors; and adjusts the operating frequency of the variable-frequency compressor to a third preset frequency, which is different from the first preset frequency and the second preset frequency.

[0026] In some embodiments, the controller executes an operation strategy of adjusting the air-conditioning system according to the target total frequency of the compressor and the total frequency of the currently operating compressor, and is specifically configured as follows: when the target total frequency of the compressor is lower than the total frequency of the currently operating compressor, the number of fixed-frequency compressors is adjusted, and the number of fixed-frequency compressors is lower than the number of currently operating fixed-frequency compressors.

[0027] It can be seen from the above embodiments that when the target total frequency of the compressor is lower than the total frequency of the currently operating compressor, it indicates that the load demand of the air-conditioning system is relatively small. Therefore, the present application can make the air-conditioning system more efficient by reducing the number of operating fixed-frequency compressors.

[0028] In some embodiments, when the target total frequency of the compressor is lower than the total frequency of the currently running compressor, the controller executes adjustment of the number of fixed-frequency compressors, which is specifically configured as follows: when the target total frequency of the compressor is lower than the total frequency of the standard compressor, the number of running fixed-frequency compressors is adjusted to 0; when the difference between the target total frequency of the compressor and the total frequency of the standard compressor is below the target threshold, the number of currently running fixed-frequency compressors is reduced; when the difference between the target total frequency of the compressor and the total frequency of the standard compressor is above the target threshold, the operating frequency of the currently running variable-frequency compressor is reduced.

[0029] In some embodiments, the controller 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, and is specifically configured to maintain the operating strategy unchanged when the target total frequency of the compressor is the same as the current total frequency of the operating compressor.

[0030] From the above embodiment, it can be seen that 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 demand and there is no need to change the operation strategy of the air-conditioning system.

[0031] In a second aspect, an embodiment of the present application provides a method for controlling an air conditioning system, the method comprising:

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

[0033] Determining the target total frequency of the compressor according to the energy demand parameter and the normalization parameter, wherein the normalization parameter is used to normalize the fixed-frequency compressor and the variable-frequency compressor into a standard compressor;

[0034] Determine the total frequency of the currently running compressors according to the parameters of the currently running compressors and the normalized parameters, wherein the parameters of the currently running compressors include the number of the currently running fixed-frequency compressors and the number of the currently running variable-frequency compressors;

[0035] The operation strategy of the air-conditioning system is adjusted according to the target total frequency of the compressors and the total frequency of the currently operating compressors. The operation strategy includes one or more of the number of operating fixed-frequency compressors, the number of operating variable-frequency compressors, and the operating frequency of the variable-frequency compressors.

[0036] In a third aspect, an embodiment of the present application provides a controller comprising: 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 includes 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] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which includes computer instructions. When the computer instructions are controlled on a computer, the computer executes the method provided in the second aspect and possible implementation methods.

[0038] In the fifth aspect, an embodiment of the present invention provides a computer program product, which 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 method provided in the second aspect and possible implementation methods.

[0039] It should be noted that the above-mentioned computer instructions may be stored in whole or in part on a computer-readable storage medium. The computer-readable storage medium may be packaged together with the processor of the controller or separately from the processor of the controller, and this application does not limit this.

[0040] The beneficial effects described in the second to fifth aspects of this application can be analyzed by referring to the beneficial effects of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0042] Figure 1 A schematic diagram of the composition of an air conditioning system provided in an embodiment of the present application;

[0043] Figure 2 A schematic structural diagram of an air conditioning system provided in an embodiment of the present application;

[0044] Figure 3 A schematic diagram of the hardware configuration of an air conditioning system provided in an embodiment of the present application;

[0045] Figure 4 A flow chart of a method for controlling an air-conditioning system provided in an embodiment of the present application;

[0046] Figure 5 A flow chart of another method for controlling an air-conditioning system provided in an embodiment of the present application;

[0047] Figure 6 A flow chart of another method for controlling an air-conditioning system provided in an embodiment of the present application;

[0048] Figure 7 A flow chart of another method for controlling an air-conditioning system provided in an embodiment of the present application;

[0049] Figure 8 A flow chart of another method for controlling an air-conditioning system provided in an embodiment of the present application;

[0050] Figure 9 A flow chart of another method for controlling an air-conditioning system provided in an embodiment of the present application;

[0051] Figure 10 A flowchart of another method for controlling an air-conditioning system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0053] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present 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 quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0055] The terms "above" and "below" herein may include the number itself or exclude the number itself.

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

[0057] Furthermore, in the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0058] As mentioned in the background, modular air conditioning systems are currently commonly used in central air conditioning to regulate indoor temperature. These systems can be either air-cooled or water-cooled. Due to the limited load capacity of a single module, multiple modules are often used in practical applications to meet the load requirements of the air conditioning system. Furthermore, with the advancement of variable-frequency technology, modular air conditioning systems often utilize a combination of fixed-frequency modules and variable-frequency modules.

[0059] When the load demand of an air conditioning system changes, the status of the operating modules in the module assembly must be adjusted in real time to meet usage requirements. In related technologies, the load control of the variable frequency modules in the module assembly typically uses the control logic of the fixed frequency module. As a result, in actual applications, the fixed frequency module and the variable frequency module may operate simultaneously, or some variable frequency modules may operate at full load while others are not. This results in poor overall energy efficiency of the air conditioning system and wastes resources.

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

[0061] In view of this, an embodiment of the present application provides an air-conditioning system and a control method thereof, which are used to adjust the operation strategy of the air-conditioning system according to load demand to optimize the operation efficiency of the air-conditioning system.

[0062] This application normalizes fixed-frequency compressors and variable-frequency compressors into a standard compressor, determines the target number and operating frequency of the standard compressors that need to be adjusted according to the operating frequency of the standard compressor, and then determines 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 number and operating frequency of the standard compressors that need to be adjusted. This makes the adjustment of the air-conditioning system more precise.

[0063] Secondly, the present application adjusts the operating strategy of the air-conditioning system according to the target total frequency of the compressor and the total frequency of the currently operating compressor, so as to optimize the operating efficiency of the air-conditioning system.

[0064] The module combination in the air-conditioning system provided in the embodiment of the present application can be an air-cooling module or a water-cooling module, and the embodiment of the present application does not impose any restrictions on this. The module combination in the present application is described by taking the air-cooling module as an example.

[0065] To further describe the technical solutions of the embodiments of the present application, Figure 1 Shown is a schematic diagram of the composition of an air-conditioning system provided in an embodiment of the present application.

[0066] like Figure 1As shown, the air conditioning system 100 includes: a master module 101 and a plurality of slave modules 102. The master module 101 can be connected to the slave modules 102 via a communication line, and the plurality of slave modules 102 can also be connected to each other via a communication line.

[0067] Optionally, the slave module 102 includes a fixed-frequency module and a variable-frequency module. The fixed-frequency module structure only includes a compressor and operates in two states: on and off. When the indoor temperature reaches a set value, the fixed-frequency module's compressor 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 and enters the evaporator, absorbing heat there. This cools the indoor air before returning it to the compressor for circulation.

[0068] The inverter module consists of a variable frequency drive (VFD) and a variable frequency compressor. The VFD adjusts the compressor speed, enabling stepless adjustment based on the required cooling capacity. When the indoor temperature reaches the set point, the VFD automatically adjusts the compressor speed to match the required cooling capacity, thereby improving energy efficiency and saving energy.

[0069] The difference in control logic between the fixed-frequency module and the variable-frequency module is that the fixed-frequency module generally adopts a simple on-off control method, controlling the on-off state by detecting indoor temperature changes through a temperature sensor; while the variable-frequency module adjusts the compressor speed according to actual needs through a variable-frequency drive, adopting a more intelligent control strategy to achieve the purpose of temperature control and energy efficiency optimization.

[0070] In some embodiments, the master 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 is composed of a compressor, a four-way valve, an outdoor heat exchanger, a throttling device, and an indoor heat exchanger. Therefore, it can be seen that the slave module 102 may include at least one compressor.

[0072] In this application, each slave module 102 implements 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 high-temperature, high-pressure refrigerant gas and discharges the compressed gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0074] The electronic expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser to a lower-pressure liquid. The evaporator evaporates the refrigerant expanded in the electronic expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves cooling by utilizing the latent heat of 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 by this application according to an exemplary embodiment. Figure 2 As shown, the air conditioning system 200 includes a main water inlet pipe 201, a main water outlet pipe 202, a sub-water inlet pipe 203 and a sub-water outlet pipe 204 of each slave module 102, and a controller 205 ( Figure 2 not shown).

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

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

[0078] The total frequency of the currently running compressors is determined based on the parameters and normalized parameters of the currently running compressors. The parameters of the currently running compressors include the number of currently running fixed-frequency compressors and the number of currently running variable-frequency compressors. The operation strategy of the air-conditioning system is adjusted based on the target total frequency of the compressors and the current total frequency of the running compressors. The operation strategy includes one or more of the operating number of fixed-frequency compressors, the operating number of 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, where the first quantity is the total number of fixed-frequency compressors normalized to standard compressors; determine a second quantity based on the capacity coefficient of each variable-frequency compressor, where the second quantity is the total number of variable-frequency compressors normalized to standard compressors; and determine the target total frequency of the compressor based on the first quantity, the second quantity, the standard compressor frequency, and the energy demand parameter.

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

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

[0082] Optionally, the controller 205 is specifically used to adjust the number of running fixed-frequency compressors according to the target total frequency of the compressor, the total frequency of the standard compressor and the number of currently running variable-frequency compressors when the target total frequency of the compressor is higher than the total frequency of the currently running compressors, so that the number of running fixed-frequency compressors is higher than the number of currently running fixed-frequency compressors.

[0083] Optionally, when the target total frequency of the compressor is higher than the total frequency of the currently operating compressors, the controller 205 is specifically configured to adjust the number of running fixed-frequency compressors when the target total frequency of the compressor is lower than the total frequency of the standard compressors and the number of currently running variable-frequency compressors is lower than the total number of variable-frequency compressors, so that the number of running fixed-frequency compressors is the same as the number of currently running fixed-frequency compressors;

[0084] The operating frequency of the variable frequency compressor is adjusted to a first preset frequency, where the first preset frequency is the optimal operating frequency of the variable frequency compressor.

[0085] When the target total frequency of the compressor is lower than the total frequency of the standard compressor and the number of currently running variable frequency compressors is the same as the total number of variable frequency compressors, the number of running fixed frequency compressors is adjusted so that the number of running fixed frequency compressors is the same as the number of currently running fixed frequency compressors;

[0086] The operating frequency of the variable frequency compressor is adjusted to a second preset frequency, where the second preset frequency is different from the first preset frequency.

[0087] When the target total frequency of the compressor is higher than the standard total frequency of the compressor, the number of running fixed-frequency compressors is adjusted so that the number of running fixed-frequency compressors is higher than the number of currently running fixed-frequency compressors;

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

[0089] Optionally, the controller 205 is specifically configured to adjust the number of fixed-frequency compressors when the target total frequency of the compressors is lower than the total frequency of the currently operating compressors, so that the number of fixed-frequency compressors is lower than the number of currently operating fixed-frequency compressors.

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

[0091] 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 number of the currently operating fixed-frequency compressors is reduced.

[0092] When 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.

[0093] Optionally, the controller 205 is specifically configured 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, the controller 205 is a device that can generate an operation control signal based on an instruction opcode and a timing signal, thereby instructing the air conditioning system 100 to execute the control instruction. For example, the controller 205 can be a central processing unit (CPU), a general-purpose processor, 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, and the embodiments of the present application do not impose any limitations on this.

[0095] In some embodiments, the controller 205 may be a microcontroller unit (MCU). An MCU, also known as a single-chip microcomputer, is a CPU that reduces the frequency and specifications of a central processing unit (CPU) and integrates peripheral interfaces such as memory, timers, USB, A / D converters, UARTs, PLCs, and DMA, as well as LCD driver circuits, onto a single chip, forming a chip-level computer capable of providing various control combinations for different 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 various components of the air-conditioning system 100 can operate to achieve various predetermined functions of the air-conditioning system 100.

[0097] Figure 3 This is a hardware configuration block diagram of an air conditioning system provided by this application according to an exemplary embodiment. 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, the temperature sensor 301 is disposed at the main water outlet pipe 202 to obtain the temperature of the main water pipe.

[0099] In some embodiments, communicator 302 is used to establish a communication connection with other network entities. Communicator 302 may include a radio frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, and a GPS module. Taking the RF module as an example, the RF module can be used to receive and transmit signals. Specifically, it can send received information to controller 205 for processing and transmit signals generated by controller 205. Typically, RF circuitry may include, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier (LNA), a duplexer, and the like.

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

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

[0102] The following is a detailed introduction to the embodiments provided in this application in conjunction with the accompanying drawings.

[0103] like Figure 4 As shown, an embodiment of the present application provides a control method for an air conditioning system, which is applied to a controller of a modular combination control system. The method includes the following steps:

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

[0105] Optionally, the energy demand parameter is usually expressed in the form of 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 parameter of the air conditioning system is determined based on one of the total inlet water temperature of the total inlet water pipeline, the total outlet water temperature of the total outlet water pipeline, and a set target temperature.

[0107] For example, Figure 5 As shown, the step of determining the energy demand parameter of the air-conditioning system may include the following steps a1 to a5.

[0108] Step a1: The controller obtains a set target temperature and a target temperature control mode, wherein the target temperature control mode includes an inlet water temperature control mode or an 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 according to the target temperature control mode.

[0110] In some embodiments, when the target temperature control mode is the inlet water temperature control mode, 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 temperature difference change rate according to the temperature difference between the current target total water pipeline temperature and the target temperature and the temperature difference between the previous target total water pipeline temperature and the target temperature.

[0113] Step a4: The controller determines the energy regulation change amount according to the temperature difference between the current target total water pipeline temperature and the target temperature and the temperature difference change rate.

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

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

[0116] Step a5: The controller determines the energy demand parameter of the air-conditioning system according to the energy adjustment change and the energy demand parameter of the air-conditioning system at the previous moment.

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

[0118] p(n)=p(n-1)+Δp Formula (1)

[0119] Among them, 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; Δp is the energy regulation change.

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

[0121] S2. Determine the target total frequency of the compressor according to the energy demand parameter and the normalized parameter.

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

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

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

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

[0126] S21. Determine a first quantity according to the capacity coefficient of each fixed-frequency compressor.

[0127] The first number 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 a second quantity according to the capacity coefficient of each variable frequency compressor.

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

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

[0132] S23. Determine a target total frequency of the compressor according to the first quantity, the second quantity, the standard compressor frequency, and the energy demand parameter.

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

[0134] Step b1: multiply the first quantity and 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] Wherein, 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, the present application normalizes fixed-frequency compressors and variable-frequency compressors into a standard compressor, determines the target number and operating frequency of the standard compressors that need to be adjusted based on the operating frequency of the standard compressor, and then determines the operating number of fixed-frequency compressors and variable-frequency compressors based on the number and operating frequency of the standard compressors that need to be adjusted. In this way, the target total compressor frequency determined based on the normalized first and second numbers is more accurate, and the adjustment of the air-conditioning system is more precise.

[0142] S3. Determine the total frequency of the currently running compressor according to the parameters of the currently running compressor and the normalized parameters.

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

[0144] In some embodiments, the above step S3 may be specifically implemented by determining the total frequency of the currently operating compressors according to the number of currently operating fixed-frequency compressors, the number of currently operating variable-frequency compressors, and the standard compressor frequency.

[0145] For example, Figure 8 As shown, the determination of 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 running variable frequency compressors, the standard compressor frequency, and the capacity coefficient to obtain the frequency of the currently running variable frequency compressor.

[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, the present 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 the operating frequency of the standard compressors, and further determines the number of fixed-frequency compressors and variable-frequency compressors to be operated based on the number and operating frequency of the standard compressors to be adjusted. In this way, the air conditioning system can be adjusted more accurately.

[0150] It can be understood that the above-mentioned step S3 can be executed before step S2, or after step S2, or simultaneously with step S2. The embodiment of the present application does not specifically limit the execution order of step S2 or step S3.

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

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

[0153] In some embodiments, when the target total frequency of the compressor is greater than the total frequency of the currently operating compressors, the number of operating inverter compressors is adjusted to be greater than the number of the currently operating inverter compressors.

[0154] Optionally, when the target total frequency of the compressor is higher than the total frequency of the currently running compressors, the number of running fixed-frequency compressors is adjusted to be higher than the number of currently running fixed-frequency compressors based on the target total frequency of the compressor, the total frequency of the standard compressor and the number of currently running variable-frequency compressors.

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

[0156] When the air conditioning system's load is light, the variable-frequency compressor runs at a lower frequency, making it significantly more energy-efficient than a fixed-frequency compressor. When the air conditioning system's load is heavy, the variable-frequency compressor runs at a higher frequency, making it less energy-efficient than a fixed-frequency compressor. When the target total compressor frequency is above the current total frequency of the operating compressors, it indicates a low load demand on the air conditioning system. Therefore, this application can improve the efficiency of the air conditioning system by increasing the number of operating variable-frequency compressors.

[0157] As a possible implementation method, when the target total frequency of the compressor is lower than the total frequency of the standard compressor and the number of currently running variable-frequency compressors is lower than the total number of variable-frequency compressors, the number of running fixed-frequency compressors is adjusted to the number of currently running fixed-frequency compressors; and 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] Exemplarily, the number of variable frequency compressors in operation is adjusted to be one more than the number of currently operating variable frequency compressors; the operating frequency of the previously operating variable frequency compressor is adjusted to the optimal operating frequency; and the frequency of the newly operating variable frequency compressor 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 standard variable-frequency compressors currently in operation; M(s) is the optimal operating frequency of the variable-frequency compressor; and Ca(nx) is the capacity coefficient of the newly running variable-frequency compressor.

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

[0163] Exemplarily, the second preset frequency may be determined by the following formula (4):

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

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

[0166] As another possible implementation method, when the target total frequency of the compressor is higher than the total frequency of the standard compressor, the number of running fixed-frequency compressors is adjusted to be higher than the number of currently running fixed-frequency compressors; and 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] Exemplarily, the number of running fixed-frequency compressors is adjusted to be one more than the number of currently running fixed-frequency compressors, and the newly running fixed-frequency compressor has the shortest cumulative running time among the unstarted fixed-frequency compressors; the operating frequency of the previously running variable-frequency compressor is adjusted to the third preset frequency.

[0168] Exemplarily, the third preset frequency may be determined by the following formula (5):

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

[0170] Wherein, 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 lists and explains the six situations in which the target total frequency of the compressor is higher than the total frequency of the current operating compressor and the corresponding operating strategies for each situation:

[0172] Wherein, 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 operating time among the currently running variable frequency compressors;

[0173] Case 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 currently operating variable frequency compressors; adjust the operating frequency of the previously operating variable frequency compressor to the optimal operating frequency M(s); adjust the frequency of the newly operating variable frequency compressor to the fourth preset frequency, where the fourth preset frequency can be determined by formula (3) above, which will not be repeated here.

[0175] Case 2: M(vc)≥M(n)>M(0), M(n) / NV(0)>M(s) and all the 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 a second preset frequency, wherein the second preset frequency can be determined by the above formula (4), which will not be described here.

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

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

[0179] Exemplarily, the third preset frequency may 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 four: Increase the number of running fixed-frequency compressors until (M(n)-[Ca(nx)+Ca(n)]*Cp)≤M(vc), and at the same time control the already running variable-frequency compressors to operate according to the frequencies in adjustment strategies one to three.

[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 five: adjust the number of running fixed-frequency compressors to be one more than the number of currently running fixed-frequency compressors, and at the same time control the already running variable-frequency compressors to operate according to the frequencies in adjustment strategies one to three.

[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 uniform speed, and adjust the operating frequency of the variable-frequency compressors that are already running to a third preset frequency, where 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 compressors is lower than the total frequency of currently operating compressors, the number of fixed-frequency compressors is adjusted so that the number of fixed-frequency compressors is lower than the number of currently operating fixed-frequency compressors.

[0188] It can be seen from the above embodiments that when the target total frequency of the compressor is lower than the total frequency of the currently operating compressor, it indicates that the load demand of the air-conditioning system is relatively small. Therefore, the present application can make the air-conditioning system more efficient by reducing the number of operating fixed-frequency compressors.

[0189] As a possible implementation manner, when the target total frequency of the compressor is lower than the standard total frequency of the compressor, the number of operations of the fixed-frequency compressors is adjusted to 0.

[0190] As another possible implementation, when the difference between the target total frequency of the compressor and the total frequency of the standard compressor is below the target threshold, the number of currently running fixed-frequency compressors is reduced.

[0191] Alternatively, the target threshold may be a product of the first number and a standard compressor frequency.

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

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

[0194] Alternatively, the target threshold may be a product of the first number and a standard compressor frequency.

[0195] Exemplarily, when 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 adjusted to a 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] Wherein, 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 lists and describes the six situations in which the target total frequency of the compressor is lower than the total frequency of the current operating compressor and the corresponding operating strategies for each situation:

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

[0201] Adjustment strategy seven: adjust all fixed-frequency compressors to stop running (adjust the number of running fixed-frequency compressors to 0), and at the same time control the already running variable-frequency compressors to run according to the frequencies in adjustment strategies one to 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 eight: adjust all fixed-frequency compressors to stop running (adjust the number of running fixed-frequency compressors to 0), adjust the variable-frequency compressor with the longest cumulative running time among the currently running variable-frequency compressors to run according to the seventh preset frequency, and at the same time adjust the operating frequencies 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 nine: 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 running fixed-frequency compressors 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 of the above situation eight.

[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 ten: 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 running variable-frequency compressors to operate according to the frequencies in adjustment strategies seven to nine.

[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 of the above situation ten.

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

[0213] Adjustment strategy 12: Adjust the operating frequency of the currently running variable frequency compressor to the sixth preset frequency, wherein the sixth preset frequency can be determined by the above formula (7), which will not be repeated here.

[0214] In some embodiments, when the target overall frequency of the compressor is equal to the current overall frequency of the operating compressor, the operation strategy is maintained unchanged.

[0215] From the above embodiment, it can be seen that 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 demand and there is no need to change the operation strategy of the air-conditioning system.

[0216] Figure 4 The illustrated embodiment provides at least the following beneficial effects: By normalizing fixed-frequency compressors and variable-frequency compressors into a standard compressor, the present application determines the target number and operating frequency of the standard compressors to be adjusted based on the operating frequency of the standard compressors. Furthermore, 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 to be adjusted are determined based on the number and operating frequency of the standard compressors to be adjusted. This allows for more precise regulation of the air conditioning system.

[0217] Secondly, the present application adjusts the operating strategy of the air-conditioning system according to the target total frequency of the compressor and the total frequency of the currently operating compressor, so as to optimize the operating efficiency of the air-conditioning system.

[0218] The following is combined with Figure 9 The illustrated embodiment exemplarily introduces the complete process of the control method of the air-conditioning system.

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

[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 parameter according to the current water temperature and the target water temperature.

[0222] In step d3, the controller determines the target compressor total frequency M(n) and the current operating compressor total frequency M(0) according to the energy demand parameter, the normalized parameter and the parameters of the current operating compressor.

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

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

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

[0226] The following is combined with Figure 10 The illustrated embodiment exemplarily introduces another process of the control method of the air-conditioning system.

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

[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 parameter according to the current water temperature and the target water temperature.

[0230] Step e3: Equivalent the target total frequency of the compressor to the total frequency of the standard compressor according to the energy demand parameter.

[0231] Step e4: determining the number of running fixed-frequency compressors, the number of running variable-frequency compressors, and the operating frequency of the variable-frequency compressors according to the total frequency of the standard compressors.

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

[0233] It can be seen that the above mainly introduces the solution provided by the embodiment of the present application from the perspective of the method. In order to realize the above functions, the embodiment of the present application provides hardware structures and / or software modules corresponding to the execution of each function. It should be easily appreciated by those skilled in the art that, in combination with the modules and algorithm steps of each example described in the embodiment disclosed herein, the embodiment of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0234] In the embodiment of the present application, the controller can be divided into functional modules according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. Optionally, the division of modules in the embodiment of the present application is schematic and is only a logical function division. In actual implementation, there may be other division methods.

[0235] An embodiment of the present application further provides a computer-readable storage medium, comprising computer-executable instructions, which, when executed on a computer, enables the computer to execute any one of the air-conditioning system control methods provided in the above embodiments.

[0236] An embodiment of the present application further provides a computer program product comprising computer-executable instructions, which, when executed on a computer, enables the computer to execute any one of the air-conditioning system control methods provided in the above embodiments.

[0237] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware, or any combination thereof. When implemented using a software program, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer-executable instructions. When the computer-executable instructions are loaded and executed on a computer, all or part of the processes or functions according to the embodiments of the present application are 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 computer-readable storage medium. For example, the computer-executable instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0238] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art can understand and implement other changes to the disclosed embodiments by reviewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple situations. A single processor or other unit can implement several functions listed in the claims. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0239] Although the present application has been described with reference to specific features and embodiments thereof, it will be apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely illustrative of the present application as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, the present application is intended to include such modifications and variations as fall within the scope of the claims of the present application and their equivalents.

[0240] The above is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection 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 conversion module, wherein the frequency conversion module includes a frequency conversion compressor; A main water pipeline connected to the water pipes of the at least one fixed-frequency air-cooling module and the at least one variable-frequency air-cooling module; A controller is electrically connected to the at least one fixed frequency module and the at least one variable frequency module, and is configured to: determining an energy demand parameter according to a current water temperature and a target water temperature of the main water pipeline; determining a target total frequency of the compressor according to the energy demand parameter and a normalization parameter, wherein the normalization parameter is used to normalize the fixed-frequency compressor and the variable-frequency compressor into a standard compressor; Determining the total frequency of the currently running compressors according to the parameters of the currently running compressors and the normalized parameters, wherein the parameters of the currently running compressors include the number of the currently running fixed-frequency compressors and the number of the currently running variable-frequency compressors; The operation strategy of the air-conditioning system is adjusted according to the target total frequency of the compressor and the total frequency of the currently operating compressors. The operation strategy includes one or more of the operating number of the fixed-frequency compressors, the operating number of the variable-frequency compressors, 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 coefficient and a standard compressor frequency, wherein the capacity coefficient is a ratio of the compressor capacity to the standard compressor capacity, and one compressor corresponds to one capacity coefficient; The controller determines the target total frequency of the compressor according to the energy demand parameter and the normalized parameter, and is specifically configured as follows: determining a first number according to the capacity coefficient of each of the fixed-frequency compressors, where the first number is the total number of the fixed-frequency compressors normalized to the standard compressors; determining a second number according to the capacity coefficient of each of the variable frequency compressors, where the second number is the total number of the variable frequency compressors normalized to the standard compressors; The target total compressor frequency is determined according to the first number, the second number, the standard compressor frequency, and the energy demand parameter.

3. The air conditioning system according to claim 1, characterized in that The controller determines the total frequency of the currently running compressor based on the parameters of the currently running compressor and the normalized parameters, and is specifically configured as follows: The total frequency of the currently operating compressors is determined according to the number of the currently operating fixed-frequency compressors, the number of the 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 step of adjusting the operation strategy of the air-conditioning system according to the target total frequency of the compressor and the current total frequency of the operating compressor, and is specifically configured as follows: When the target total frequency of the compressor is greater than the total frequency of the currently operating compressors, the number of operating inverter compressors is adjusted, and the number of operating inverter compressors is greater than the number of currently operating inverter compressors.

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

6. The air conditioning system according to claim 5, characterized in that The controller adjusts the number of running fixed-frequency compressors according to the target total frequency of the compressor, the standard total frequency of the compressor, and the number of currently running variable-frequency compressors, and is specifically configured as follows: When the target total frequency of the compressor is lower than the total frequency of the standard compressor and the number of the currently running variable-frequency compressors is lower than the total number of variable-frequency compressors, adjusting the number of the running fixed-frequency compressors so that the number of the running fixed-frequency compressors is the same as the number of the currently running fixed-frequency compressors; Adjusting the operating frequency of the variable frequency compressor to a first preset frequency, where the first preset frequency is the optimal operating frequency of the variable frequency compressor; When the target total frequency of the compressor is lower than the total frequency of the standard compressor and the number of the currently running variable-frequency compressors is the same as the total number of variable-frequency compressors, adjusting the number of the running fixed-frequency compressors so that the number of the running fixed-frequency compressors is the same as the number of the currently running fixed-frequency compressors; adjusting the operating frequency of the variable frequency compressor to a second preset frequency, where the second preset frequency is different from the first preset frequency; When the target total frequency of the compressor is higher than the standard total frequency of the compressor, adjusting the number of running fixed-frequency compressors, so that the number of running fixed-frequency compressors is higher than the number of currently running fixed-frequency compressors; The operating frequency of the variable frequency compressor is adjusted to a third preset frequency, where the third preset frequency 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 step of adjusting the operation strategy of the air-conditioning system according to the target total frequency of the compressor and the current total frequency of the operating compressor, and is specifically configured as follows: When the target total frequency of the compressor is lower than the total frequency of the currently operating compressors, the number of the fixed-frequency compressors is adjusted so that the number of the fixed-frequency compressors is lower than the number of the 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 lower than the total frequency of the currently operating compressor, the controller adjusts the number of the fixed-frequency compressors, which is specifically configured as follows: When the target total frequency of the compressor is lower than the standard total frequency of the compressor, adjusting the number of operations of the fixed-frequency compressor to 0; When the difference between the target total frequency of the compressor and the total frequency of the standard compressor is below a target threshold, reducing the number of the currently running fixed-frequency compressors; When the difference between the target total frequency of the compressor and the standard total frequency of the compressor is greater than a 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 step of adjusting the operation strategy of the air-conditioning system according to the target total frequency of the compressor and the current total frequency of the operating compressor, and is specifically configured as follows: When the target total frequency of the compressor is the same as the total frequency of the currently operating compressor, the operation strategy is maintained unchanged.

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

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