A control method and device of an air source heat pump system, and an air source heat pump system

Abstract

The application provides a control method and device of an air source heat pump system and the air source heat pump system. The method obtains the opening state of each group of air source heat pump units at the current time, detects the water temperature difference, load rate, refrigerating capacity and heating capacity of the system, adopts different control strategies for the opened air source heat pump units in different working modes, and solves the water mixing problem caused by the asynchronous start-stop frequency of each group of air source heat pump units in the traditional system through a dynamic grouping control method, thereby improving the operation energy efficiency of the system.

Description

Technical Field

[0001] This invention relates to the field of intelligent control, and specifically to a control method, device, and air source heat pump system for an air source heat pump system. Background Technology

[0002] In air source heat pump systems, grouping strategies can optimize system operation. Traditional grouping strategies, while meeting end-user demand, prioritize shutting down certain groups to match that demand. However, due to asynchronous start-up and shutdown frequencies of different units, water mixing occurs in the system pipes. This mixing leads to decreased system efficiency and affects overall system performance. Furthermore, insufficient precision in matching unit performance with end-user demand results in lower unit efficiency. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a control method, device, and air source heat pump system to solve the problem of water mixing caused by asynchronous start-up and shutdown frequencies of different groups of air source heat pump units in the prior art, thereby improving the operating energy efficiency of the system.

[0004] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0005] According to a first aspect of the present invention, a control method for an air source heat pump system is provided, comprising an outdoor heat exchanger, a four-way valve, and further comprising:

[0006] Get the current operating status of each group of air source heat pump units;

[0007] The system monitors the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity.

[0008] Based on the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity, different control strategies are adopted for each group of air source heat pump units that are turned on under different operating modes.

[0009] Preferably, the different control strategies adopted for each group of air source heat pump units in different operating modes include:

[0010] In cooling mode, if the temperature difference between the inlet and outlet water of the system is greater than or equal to the preset temperature difference, the system maintains stable operation of its current cooling capacity. Only when the system's cooling capacity is less than the preset cooling capacity will the cooling capacity of all activated air source heat pump units be increased by a first preset ratio. If the temperature difference between the inlet and outlet water of the system is less than the preset temperature difference, the cooling capacity of all activated air source heat pump units will be reduced by a first preset ratio.

[0011] Preferably, the method further includes:

[0012] In cooling mode, after reducing the cooling capacity of all activated air source heat pump units by the first preset ratio, it is determined whether the system load rate is greater than the preset load rate. If so, the inlet and outlet water temperature difference of the system is re-detected, and it is re-determined whether the inlet and outlet water temperature difference of the system is greater than or equal to the preset temperature difference; otherwise, one group of air source heat pump units is shut down.

[0013] Preferably, the method further includes:

[0014] In cooling mode, if the number of remaining active air source heat pump units is greater than one, the system's inlet and outlet water temperature difference will be re-detected, and it will be re-determined whether the system's inlet and outlet water temperature difference is greater than or equal to the preset temperature difference.

[0015] Preferably, the method further includes:

[0016] In cooling mode, if the number of remaining active air source heat pump units is less than or equal to one, determine whether the current temperature difference between the inlet and outlet water of the system is less than the preset temperature difference.

[0017] If so, shut down one air source heat pump unit, and only keep the system running at the current load rate if the actual load rate of the system is less than or equal to the preset load rate; otherwise, keep the system running at the current load rate.

[0018] Preferably, the different control strategies adopted for each group of air source heat pump units in different operating modes include:

[0019] In heating mode, if the temperature difference between the inlet and outlet water of the system is greater than or equal to the preset temperature difference, the current heating capacity of the system will be kept stable. Only when the system heating capacity is less than the preset heating capacity, the heating capacity of all the air source heat pump units that are turned on will be increased according to the second preset ratio. If the temperature difference between the inlet and outlet water of the system is less than the preset temperature difference, the heating capacity of all the air source heat pump units that are turned on will be reduced according to the second preset ratio.

[0020] Preferably, the method further includes:

[0021] In heating mode, after reducing the heating capacity of all activated air source heat pump units by the second preset ratio, it is determined whether the system load rate is greater than the preset load rate. If so, the inlet and outlet water temperature difference of the system is re-detected, and it is re-determined whether the inlet and outlet water temperature difference of the system is greater than or equal to the preset temperature difference; otherwise, all activated air source heat pump units are controlled to operate stably at the preset load rate.

[0022] According to a second aspect of the present invention, a control device for an air source heat pump system is provided, comprising:

[0023] The acquisition module is used to obtain the current operating status of each group of air source heat pump units;

[0024] The detection module is used to detect the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity of the system.

[0025] The control module is used to adopt different control strategies for each group of air source heat pump units that are turned on, based on the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity, under different working modes.

[0026] According to a third aspect of the present invention, an air source heat pump system is provided, comprising:

[0027] The processor, communication interface, memory, and communication bus are connected, with the processor, communication interface, and memory communicating with each other via the communication bus.

[0028] Memory, used to store computer programs;

[0029] The processor implements the above method when executing programs stored in memory.

[0030] According to a fourth aspect of the present invention, a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the methods described above is provided.

[0031] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

[0032] By acquiring the current operating status of each group of air source heat pump units and detecting the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity of the system, different control strategies can be adopted for each group of air source heat pump units under different operating modes. In this way, the problem of water mixing caused by the asynchronous start-stop frequency of each group of air source heat pump units in the traditional system is solved through dynamic group control method, thereby improving the operating energy efficiency of the system. Attached Figure Description

[0033] Figure 1 This is a flowchart illustrating a control method for an air source heat pump system according to an exemplary embodiment;

[0034] Figure 2 This is a schematic diagram of the structure of an air source heat pump system according to an exemplary embodiment;

[0035] Figure 3 This is a flowchart illustrating a control method for an air source heat pump system according to another exemplary embodiment;

[0036] Figure 4 This is a flowchart illustrating a control method for an air source heat pump system according to another exemplary embodiment;

[0037] Figure 5This is a schematic block diagram of a control device for an air source heat pump system according to another exemplary embodiment. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0039] Example 1

[0040] Figure 1 This is a flowchart illustrating a control method for an air source heat pump system according to an exemplary embodiment, such as... Figure 1 As shown, the method includes:

[0041] Step S11: Obtain the current operating status of each group of air source heat pump units;

[0042] Step S12: Detect the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity of the system;

[0043] Step S13: Based on the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity, different control strategies are adopted for each group of air source heat pump units that are turned on under different working modes.

[0044] In practical application, the technical solution provided in this embodiment operates in the controller of an air source heat pump system. One implementation of the air source heat pump system can be as follows: Figure 2 As shown, the controller includes, but is not limited to, one or more of the following:

[0045] PLC controllers, ARM processors, microcontrollers, DSP processors, FPGA controllers, etc.

[0046] It is understood that the technical solution provided in this embodiment obtains the current operating status of each group of air source heat pump units and detects the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity of the system. This enables different control strategies to be adopted for each group of air source heat pump units under different operating modes. In turn, through the dynamic group control method, the problem of water mixing caused by the asynchronous start and stop frequencies of each group of air source heat pump units in the traditional system is solved, thereby improving the operating energy efficiency of the system.

[0047] In practice, step S13 employs different control strategies for each group of air source heat pump units under different operating modes, including:

[0048] In cooling mode, if the temperature difference between the inlet and outlet water of the system is greater than or equal to the preset temperature difference, the system maintains stable operation of its current cooling capacity. Only when the system's cooling capacity is less than the preset cooling capacity will the cooling capacity of all activated air source heat pump units be increased by a first preset ratio. If the temperature difference between the inlet and outlet water of the system is less than the preset temperature difference, the cooling capacity of all activated air source heat pump units will be reduced by a first preset ratio.

[0049] It should be noted that the first preset ratio can be set according to user needs, or according to historical experience values, for example, set to 5%.

[0050] Understandably, if the system's inlet and outlet water temperature difference is greater than or equal to the preset temperature difference, it indicates that the current end-user's demand for cooling capacity is high. The system can maintain stable operation at its current cooling capacity, and only when the system's cooling capacity is less than the user-set preset cooling capacity will the cooling capacity of all activated air source heat pump units be increased by a first preset ratio. If the system's inlet and outlet water temperature difference is less than the preset temperature difference, it indicates that the current end-user's demand for cooling capacity is not high, and the cooling capacity of all activated air source heat pump units will be reduced by a first preset ratio.

[0051] The advantage of this setup is that by reducing the operating load rate of each unit, it allows them to operate under optimal conditions, thereby improving unit energy efficiency. This helps reduce system energy consumption and improve overall system energy efficiency.

[0052] Furthermore, on the one hand, the dynamic group control method allows for optimized system control based on actual conditions, improving system performance and efficiency. On the other hand, it enables the synchronous frequency increase / decrease of all activated air source heat pump units by either increasing or decreasing their cooling capacity according to a preset ratio, thus controlling the grouping and preventing system mixing and ensuring precise matching between unit and terminal demand.

[0053] In practice, the method further includes:

[0054] In cooling mode, after reducing the cooling capacity of all activated air source heat pump units by the first preset ratio, it is determined whether the system load rate is greater than the preset load rate. If so, it means that the system is operating under overload and the inlet and outlet water temperature difference of the system needs to be re-detected and re-determined whether the inlet and outlet water temperature difference of the system is greater than or equal to the preset temperature difference. Otherwise, it means that the cooling demand provided by the system has far exceeded the demand of the end users, and one group of air source heat pump units can be shut down to reduce system energy consumption.

[0055] In practice, the method further includes:

[0056] In cooling mode, if the number of remaining active air source heat pump units exceeds one, the system's inlet and outlet water temperature difference is re-detected, and it is re-evaluated to ensure that the inlet and outlet water temperature difference is greater than or equal to the preset temperature difference. The advantage of this setting is that it ensures that the control strategy adjusts accordingly when the number of active units changes, achieving refined control and guaranteeing the matching degree between the units and the terminal demand.

[0057] In practice, the method further includes:

[0058] In cooling mode, if the number of remaining active air source heat pump units is less than or equal to one, determine whether the current temperature difference between the inlet and outlet water of the system is less than the preset temperature difference.

[0059] If so, it means that the current end users do not have a large demand for cooling capacity. Turn off one air source heat pump unit, and only keep the system running at the current load rate when the actual load rate of the system is less than or equal to the preset load rate; otherwise, keep the system running at the current load rate.

[0060] In practice, step S13 employs different control strategies for each group of air source heat pump units under different operating modes, including:

[0061] In heating mode, if the temperature difference between the inlet and outlet water of the system is greater than or equal to the preset temperature difference, the current heating capacity of the system will be kept stable. Only when the system heating capacity is less than the preset heating capacity, the heating capacity of all the air source heat pump units that are turned on will be increased according to the second preset ratio. If the temperature difference between the inlet and outlet water of the system is less than the preset temperature difference, the heating capacity of all the air source heat pump units that are turned on will be reduced according to the second preset ratio.

[0062] It should be noted that the second preset ratio can be set according to the user's needs, or according to historical experience values, for example, set to 10%.

[0063] Similarly, if the inlet and outlet water temperature difference of the system is greater than or equal to the preset temperature difference, it indicates that the current end-user's demand for heating is relatively high. The system can maintain stable operation of its current heating capacity. Only when the system's heating capacity is less than the user-set preset heating capacity will the heating capacity of all activated air source heat pump units be increased according to the second preset ratio. If the inlet and outlet water temperature difference of the system is less than the preset temperature difference, it indicates that the current end-user's demand for heating is not high. The heating capacity of all activated air source heat pump units will be reduced according to the second preset ratio.

[0064] In practice, the method further includes:

[0065] In heating mode, after reducing the heating capacity of all activated air source heat pump units by the second preset ratio, it is determined whether the system load rate is greater than the preset load rate. If so, the inlet and outlet water temperature difference of the system is re-detected, and it is re-determined whether the inlet and outlet water temperature difference of the system is greater than or equal to the preset temperature difference; otherwise, all activated air source heat pump units are controlled to operate stably at the preset load rate.

[0066] It is understood that the technical solution provided in this embodiment solves the problem of water mixing caused by the asynchronous start-stop frequencies of each group of air source heat pump units in the traditional system through a dynamic group control method, thereby improving the system's operating efficiency and reducing water mixing.

[0067] In addition, when the cooling capacity provided by the system can meet the needs of end users, reducing the operating load rate of each unit to allow it to operate under optimal conditions can improve the energy efficiency of the units, thereby helping to reduce the energy consumption of the system and improve the overall energy efficiency of the system.

[0068] Furthermore, by using dynamic group control methods and adjusting unit load rates, the system can be optimized and controlled according to actual conditions, thereby improving the system's operational efficiency and performance.

[0069] Example 2

[0070] Figure 3 This is a flowchart illustrating a control method for an air source heat pump system according to another exemplary embodiment, such as... Figure 3 As shown, the method includes:

[0071] Step S21: In cooling mode, the air source heat pump unit is divided into N groups, n groups are actually turned on, preset temperature difference T, actual inlet and outlet water temperature difference t, preset cooling capacity W, actual cooling capacity w, preset load rate A, and actual load rate a.

[0072] Step S22: If the temperature difference between the inlet and outlet water of the system is greater than or equal to the preset temperature difference (t≥T), the current cooling capacity of the system is kept stable. Only when the system cooling capacity is less than the preset cooling capacity (w<W), the cooling capacity of all the air source heat pump units that are turned on is increased by 5% according to the first preset ratio. If the temperature difference between the inlet and outlet water of the system is less than the preset temperature difference (t<T), the cooling capacity of all the air source heat pump units that are turned on is decreased by 5% according to the first preset ratio.

[0073] Step S23: After reducing the cooling capacity of all the air source heat pump units that are turned on by 5% according to the first preset ratio, determine whether the load rate of the system is greater than the preset load rate. If it is (a>A), re-detect the inlet and outlet water temperature difference of the system and re-determine whether the inlet and outlet water temperature difference of the system is greater than or equal to the preset temperature difference; otherwise (a≤A), shut down one group of air source heat pump units.

[0074] Step S24: If the number of remaining operating air source heat pump units is greater than one (n > 1), re-detect the temperature difference between the inlet and outlet water of the system, and re-determine whether the temperature difference between the inlet and outlet water of the system is greater than or equal to the preset temperature difference, then return to Step S22;

[0075] If the number of remaining operating air source heat pump units is less than or equal to one (n ≤ 1), determine whether the temperature difference between the inlet and outlet water of the system at the current moment is less than the preset temperature difference;

[0076] Step S25: If so (t < T), turn off one air source heat pump unit, and only when the actual load rate of the system is less than or equal to the preset load rate (a ≤ A), keep the system running stably at the current load rate; otherwise (t ≥ T), directly keep the system running stably at the current load rate.

[0077] Figure 4 It is a flowchart of a control method for an air source heat pump system shown according to another exemplary embodiment. As Figure 4 shown, this method includes:

[0078] Step S31: In the heating mode, the air source heat pump units are divided into N groups, n groups are actually turned on, the preset temperature difference is T, the actual temperature difference between the inlet and outlet water is t, the preset heating capacity is W, the actual heating capacity is w, the preset load rate is A, and the actual load rate is a;

[0079] Step S32: If the temperature difference between the inlet and outlet water of the system is greater than or equal to the preset temperature difference (t ≥ T), keep the system running stably at the current heating capacity, and only when the heating capacity of the system is less than the preset heating capacity (w < W), increase the heating capacity of all operating air source heat pump units by the second preset ratio of 10%; if the temperature difference between the inlet and outlet water of the system is less than the preset temperature difference (t < T), reduce the heating capacity of all operating air source heat pump units by the second preset ratio of 10%;

[0080] After reducing the heating capacity of all operating air source heat pump units by the second preset ratio of 10%, determine whether the load rate of the system is greater than the preset load rate. If so (a > A), re-detect the temperature difference between the inlet and outlet water of the system, and re-determine whether the temperature difference between the inlet and outlet water of the system is greater than or equal to the preset temperature difference; otherwise (a ≤ A), control all operating air source heat pump units to run stably at the preset load rate.

[0081] It can be understood that the technical solution provided in this embodiment solves the mixing water problem caused by the asynchronous start-stop frequencies of each group of air source heat pump units in the traditional system through the dynamic grouping control method, thereby improving the operating energy efficiency of the system and reducing the mixing water phenomenon.

[0082] In addition, when the cooling capacity provided by the system can meet the needs of end users, reducing the operating load rate of each unit to allow it to operate under optimal conditions can improve the energy efficiency of the units, thereby helping to reduce the energy consumption of the system and improve the overall energy efficiency of the system.

[0083] Furthermore, by using dynamic group control methods and adjusting unit load rates, the system can be optimized and controlled according to actual conditions, thereby improving the system's operational efficiency and performance.

[0084] Example 3

[0085] Figure 5 This is a schematic block diagram of a control device 100 for an air source heat pump system according to an exemplary embodiment, such as... Figure 5 As shown, the device 100 includes:

[0086] The acquisition module 101 is used to acquire the current operating status of each group of air source heat pump units;

[0087] The detection module 102 is used to detect the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity of the system.

[0088] The control module 103 is used to adopt different control strategies for each group of air source heat pump units that are turned on, based on the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity, under different working modes.

[0089] In practical application, the technical solution provided in this embodiment operates in the controller of an air source heat pump system. One implementation of the air source heat pump system can be as follows: Figure 2 As shown, the controller includes, but is not limited to, one or more of the following:

[0090] PLC controllers, ARM processors, microcontrollers, DSP processors, FPGA controllers, etc.

[0091] It is understood that the technical solution provided in this embodiment obtains the current operating status of each group of air source heat pump units and detects the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity of the system. This enables different control strategies to be adopted for each group of air source heat pump units under different operating modes. In turn, through the dynamic group control method, the problem of water mixing caused by the asynchronous start and stop frequencies of each group of air source heat pump units in the traditional system is solved, thereby improving the operating energy efficiency of the system.

[0092] Example 3

[0093] An exemplary embodiment illustrates an air source heat pump system, comprising:

[0094] The processor, communication interface, memory, and communication bus are connected, with the processor, communication interface, and memory communicating with each other via the communication bus.

[0095] Memory, used to store computer programs;

[0096] The processor implements the above method when executing programs stored in memory.

[0097] It is understood that the technical solution provided in this embodiment obtains the current operating status of each group of air source heat pump units and detects the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity of the system. This enables different control strategies to be adopted for each group of air source heat pump units under different operating modes. In turn, through the dynamic group control method, the problem of water mixing caused by the asynchronous start and stop frequencies of each group of air source heat pump units in the traditional system is solved, thereby improving the operating energy efficiency of the system.

[0098] Example 4

[0099] An exemplary embodiment illustrates a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the methods described above.

[0100] It is understood that the technical solution provided in this embodiment obtains the current operating status of each group of air source heat pump units and detects the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity of the system. This enables different control strategies to be adopted for each group of air source heat pump units under different operating modes. In turn, through the dynamic group control method, the problem of water mixing caused by the asynchronous start and stop frequencies of each group of air source heat pump units in the traditional system is solved, thereby improving the operating energy efficiency of the system.

[0101] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0102] In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, or indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0103] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0104] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0105] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A control method for an air source heat pump system, characterized in that, include: Get the current operating status of each group of air source heat pump units; The system monitors the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity. Based on the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity, different control strategies are adopted for each group of air source heat pump units that are turned on under different working modes. Different control strategies are adopted for each group of air source heat pump units that are turned on under different operating modes, including: In cooling mode, if the temperature difference between the inlet and outlet water of the system is greater than or equal to the preset temperature difference, the system maintains stable operation of the current cooling capacity. Only when the system cooling capacity is less than the preset cooling capacity, the cooling capacity of all the air source heat pump units that are turned on is increased by the first preset ratio. If the temperature difference between the inlet and outlet water of the system is less than the preset temperature difference, the cooling capacity of all the air source heat pump units that are turned on is decreased by the first preset ratio. In cooling mode, after reducing the cooling capacity of all activated air source heat pump units by the first preset ratio, it is determined whether the system load rate is greater than the preset load rate. If so, the inlet and outlet water temperature difference of the system is re-detected, and it is re-determined whether the inlet and outlet water temperature difference of the system is greater than or equal to the preset temperature difference; otherwise, one group of air source heat pump units is shut down.

2. The method according to claim 1, characterized in that, Also includes: In cooling mode, if the number of remaining active air source heat pump units is greater than one, the system's inlet and outlet water temperature difference will be re-detected, and it will be re-determined whether the system's inlet and outlet water temperature difference is greater than or equal to the preset temperature difference.

3. The method according to claim 2, characterized in that, Also includes: In cooling mode, if the number of remaining active air source heat pump units is less than or equal to one, determine whether the current temperature difference between the inlet and outlet water of the system is less than the preset temperature difference. If so, shut down one air source heat pump unit, and only keep the system running at the current load rate if the actual load rate of the system is less than or equal to the preset load rate; otherwise, keep the system running at the current load rate.

4. The method according to claim 1, characterized in that, Different control strategies are adopted for each group of air source heat pump units that are turned on under different operating modes, including: In heating mode, if the temperature difference between the inlet and outlet water of the system is greater than or equal to the preset temperature difference, the current heating capacity of the system will be kept stable. Only when the system heating capacity is less than the preset heating capacity, the heating capacity of all the air source heat pump units that are turned on will be increased according to the second preset ratio. If the temperature difference between the inlet and outlet water of the system is less than the preset temperature difference, the heating capacity of all the air source heat pump units that are turned on will be reduced according to the second preset ratio.

5. The method according to claim 4, characterized in that, Also includes: In heating mode, after reducing the heating capacity of all activated air source heat pump units by the second preset ratio, it is determined whether the system load rate is greater than the preset load rate. If so, the inlet and outlet water temperature difference of the system is re-detected, and it is re-determined whether the inlet and outlet water temperature difference of the system is greater than or equal to the preset temperature difference. Otherwise, control all activated air source heat pump units to operate stably at the preset load rate.

6. A control device for an air source heat pump system, characterized in that, For performing the method according to any one of claims 1 to 5, comprising: The acquisition module is used to obtain the current operating status of each group of air source heat pump units; The detection module is used to detect the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity of the system. The control module is used to adopt different control strategies for each group of air source heat pump units that are turned on, based on the inlet and outlet water temperature difference, load rate, cooling capacity, and heating capacity, under different working modes.

7. An air source heat pump system, characterized in that, include: Processor, communication interface, memory, and communication bus, among which, processor, communication interface, The memory modules communicate with each other via a communication bus; Memory, used to store computer programs; A processor, when executing a program stored in memory, implements the method described in any one of claims 1 to 5.

8. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to perform the method according to any one of claims 1-5.

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