Air conditioning system and control method thereof

Abstract

The invention relates to the technical field of air conditioners, particularly provides an air conditioning system and a control method thereof, and aims to solve the problems that the energy efficiency and the response speed of the air conditioning system are unstable due to the fact that the running time of an existing compressor is unbalanced, and the service life difference of all compressors is large. In order to achieve the purpose, the air conditioning system comprises a plurality of subsystems, each subsystem comprises a plurality of compressors, and the control method of the air conditioning system comprises the steps that the number of the compressors running in each subsystem is determined according to the running state of the air conditioning system. Specifically, when the operation number of the compressors is increased, the compressors with the short operation duration are increased; when the operation number of the compressors is reduced, the number of the compressors is reduced to be the compressors with longer operation time. Through the control, the running durations of all the compressors of the air conditioning system tend to be the same, it is guaranteed that the energy efficiency and the response speed of the air conditioning system are stable, it is also guaranteed that the service life of the compressors is basically the same, and it is guaranteed that the air conditioning system is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and specifically provides an air conditioning system and a control method therefor. Background Art

[0002] With the development of economy and technology, large-scale air conditioning systems have become essential equipment in shopping malls, office buildings, hotels, etc. Existing air conditioning systems are more or less equipped with multiple groups of compressors, and each group of compressors includes multiple compressors. However, during operation, mostly fixed platform compressors operate, and when operating at high power, other compressors will only participate in the operation. This results in uneven operation times of each compressor. The uneven operation times of the compressors will cause the energy efficiency and response speed of the air conditioning system to be unstable, and will also cause significant differences in the service lives of each compressor.

[0003] Therefore, there is an urgent need for an air conditioning system and a control method therefor to solve the above technical problems. Summary of the Invention

[0004] The present invention aims to solve the above technical problems, that is, to solve the problems that the uneven operation times of existing compressors will cause the energy efficiency and response speed of the air conditioning system to be unstable, and will also cause significant differences in the service lives of each compressor.

[0005] In a first aspect, the present invention provides a control method for an air conditioning system, the air conditioning system including multiple subsystems, the subsystems including multiple compressors, and the control method for the air conditioning system including:

[0006] Determine the number of compressors operating in each of the subsystems according to the operating state of the air conditioning system.

[0007] In a specific implementation manner of the control method for the air conditioning system above, "determine the number of compressors operating in each of the subsystems" includes:

[0008] Determine the subsystem that needs to increase the number of compressors operating, and turn on the compressor with the shortest operating time in this subsystem.

[0009] In a specific implementation manner of the control method for the air conditioning system above, "determine the subsystem that needs to increase the number of compressors operating" includes:

[0010] When the number of compressors operating in each of the subsystems is different, and there is only one subsystem with the least number of compressors operating, then the subsystem that needs to increase the number of compressors operating is the subsystem with the least number of compressors operating.

[0011] In a specific implementation manner of the control method for the air conditioning system above, "determine the subsystem that needs to increase the number of compressors operating" includes:

[0012] When the number of compressors operated by each of the subsystems is different, and there are multiple subsystems with the least number of compressors in operation, then the subsystem where the compressor with the shortest operation duration among the multiple subsystems with the least number of compressors in operation is the subsystem that needs to increase the number of compressors in operation.

[0013] In the specific implementation of the above control method for the air conditioning system, "determining the subsystem that needs to increase the number of compressors in operation" includes:

[0014] When the number of compressors operated by each of the subsystems is the same, then the subsystem where the compressor with the shortest operation duration among all the subsystems is the subsystem that needs to increase the number of compressors in operation.

[0015] In the specific implementation of the above control method for the air conditioning system, among the subsystems determined to need to increase the number of compressors in operation, when a compressor in the subsystem is faulty and all the normal compressors in the subsystem have been turned on, and the air conditioning system needs to increase the number of compressors in operation, then this subsystem will no longer participate in the judgment.

[0016] In the specific implementation of the above control method for the air conditioning system, "determining the number of compressors operated by each of the subsystems" includes:

[0017] Determine the subsystem that needs to reduce the number of compressors in operation, and turn off the compressor with the longest operation duration in this subsystem.

[0018] In the specific implementation of the above control method for the air conditioning system, "determining the subsystem that needs to reduce the number of compressors in operation" includes:

[0019] When the number of compressors operated by each of the subsystems is different, and there is one subsystem with the most number of compressors in operation, then the subsystem that needs to reduce the number of compressors in operation is the subsystem with the most number of compressors in operation.

[0020] In the specific implementation of the above control method for the air conditioning system, "determining the subsystem that needs to reduce the number of compressors in operation" includes:

[0021] When the number of compressors operated by each of the subsystems is different, and there are multiple subsystems with the most number of compressors in operation, then the subsystem where the compressor with the longest operation duration among the multiple subsystems with the most number of compressors in operation is the subsystem that needs to reduce the number of compressors in operation.

[0022] In the specific implementation of the control method of the above air conditioning system, "determining the subsystem that needs to reduce the number of compressors in operation" includes:

[0023] When the number of compressors in operation in each of the subsystems is the same, the subsystem where the compressor with the longest operation time among all the subsystems is the subsystem that needs to reduce the number of compressors in operation.

[0024] In a second aspect, the present invention provides an air conditioning system, the air conditioning system includes a control module and a plurality of subsystems, the subsystems include a plurality of compressors, and the control module is configured to be able to execute the control method of the air conditioning system as described above.

[0025] In the case of adopting the above technical solution, the air conditioning system of the present invention includes a plurality of subsystems, the subsystems include a plurality of compressors, and the control method of the air conditioning system includes: determining the number of compressors in operation in each subsystem according to the operating state of the air conditioning system. Specifically, when increasing the number of compressors in operation, the compressors with shorter increased operation time are added; when reducing the number of compressors in operation, the compressors with longer operation time are reduced. Through this control, the operation time of all compressors in the air conditioning system can tend to be the same, ensuring that the energy efficiency and response speed of the air conditioning system are relatively stable, and also ensuring that the service lives of each compressor are basically the same, ensuring that the air conditioning system is relatively stable. Description of the Drawings

[0026] The following describes the preferred embodiments of the present invention with reference to the drawings, in which:

[0027] Figure 1 is the main step flowchart of the control method of the air conditioning system provided by the present invention;

[0028] Figure 2 is the detailed step flow of the control method of the air conditioning system provided by the present invention Figure 1 ;

[0029] Figure 3 is the main step flow of the control method of the air conditioning system provided by the present invention Figure 2 . Specific Embodiments

[0030] The following describes the preferred embodiments of the present invention with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0031] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0032] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "setting", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] The operating times of the compressors are unbalanced, which will cause the energy efficiency and response speed of the air-conditioning system to be unstable, and will also cause a large difference in the service lives of the individual compressors.

[0034] To solve the above technical problems, the present embodiment discloses an air-conditioning system, which includes a plurality of subsystems arranged in parallel. The air-conditioning system includes a plurality of indoor heat exchangers and a plurality of outdoor heat exchangers, wherein the plurality of indoor heat exchangers are arranged in parallel and are connected in parallel to the main pipeline. The plurality of outdoor heat exchangers are also arranged in parallel and are connected in parallel to the main pipeline. Each subsystem includes a plurality of compressors arranged in parallel. And all the compressors are connected in parallel to the main pipeline. That is, all the compressors can serve all the indoor heat exchangers and outdoor heat exchangers.

[0035] The specific structure of the air-conditioning system is described by taking a common three-pipeline multi-connected air-conditioning system as an example.

[0036] The first sides of the plurality of indoor heat exchangers are all connected to the high-pressure main road through the high-pressure branch, the first sides of the plurality of indoor heat exchangers are all connected to the low-pressure main road through the low-pressure branch, and the second sides of the plurality of indoor heat exchangers are all connected to the liquid pipe main road through the liquid branch. The first sides of the plurality of outdoor heat exchangers are all connected to the liquid pipe main road; the second sides of the plurality of outdoor heat exchangers are all connected to the first interface of the four-way valve, the exhaust sides of all the compressors are all connected to the second interface of the four-way valve, the high-pressure main road is connected to the third interface of the four-way valve, the low-pressure main road is connected to the suction side of the compressor and is connected to the fourth interface of the four-way valve. Specifically, the suction sides of all the compressors are all connected to the third interface.

[0037] Cut-off valves are provided on both the high-pressure branch and the low-pressure branch. In the heating mode, the cut-off valve on the high-pressure branch is opened, allowing the high-temperature and high-pressure gaseous refrigerant to enter the indoor heat exchanger for heating. And by closing the cut-off valve on the low-pressure branch, the refrigerant in the low-pressure main path cannot flow to the indoor heat exchanger, and the high-temperature and high-pressure gaseous refrigerant also cannot flow to the low-pressure branch and the low-pressure main path.

[0038] In the cooling mode, the cut-off valve on the high-pressure branch is closed, allowing the high-temperature and high-pressure gaseous refrigerant to enter the outdoor heat exchanger for heat exchange, and then flowing through the liquid pipe main path to the indoor heat exchanger for cooling. And by opening the cut-off valve on the low-pressure branch, the refrigerant flowing out of the indoor heat exchanger can flow through the low-pressure branch to the low-pressure main path and then back to the compressor.

[0039] An oil separator is provided on the exhaust side of the compressor, and the high-temperature and high-pressure gaseous refrigerant flowing out of the compressor is separated by the oil separator. The oil return port of the oil separator is connected to the suction side of the compressor, allowing the separated lubricating oil to flow back to the compressor again to continue lubricating the impeller of the compressor, etc. An oil separator is provided on the exhaust side of each compressor, or an oil separator can be shared by the exhaust sides of multiple compressors, and the oil return port of this oil separator is connected to the suction sides of multiple compressors.

[0040] A gas-liquid separator is provided on the suction side of the compressor, and the exhaust port of the gas-liquid separator is connected to the suction side of the compressor. If the refrigerant flowing into the gas-liquid separator is mixed with liquid refrigerant, it can be separated in the gas-liquid separator, allowing the gaseous refrigerant to flow into the compressor, ensuring that no liquid refrigerant flows into the compressor. Since the temperature in the gas-liquid separator is higher than the boiling point of the refrigerant, the liquid refrigerant exchanges heat with the gaseous refrigerant in the gas-liquid separator, absorbs heat and becomes gaseous refrigerant, which then flows to the compressor to participate in the cycle. A gas-liquid separator is provided on the suction side of each compressor, or a gas-liquid separator can be shared by the suction sides of multiple compressors, that is, multiple compressors are connected in parallel to this gas-liquid separator.

[0041] Multiple indoor heat exchangers can be respectively arranged in different rooms to provide heating or cooling for different rooms. Or multiple indoor heat exchangers can be arranged in one room, allowing each indoor heat exchanger to provide cooling or heating for the area it serves.

[0042] In the heating mode, the high-temperature and high-pressure refrigerant flowing out of the exhaust side of the compressor flows through the four-way valve to the high-pressure main path, and then to the indoor heat exchanger that needs heating. It releases heat in the indoor heat exchanger to heat the room, and then flows through the liquid pipe branch and the liquid pipe main path to the outdoor heat exchanger. After heat exchange in the outdoor heat exchanger, it flows to the low-pressure main path, and then to the suction side of the compressor, and is compressed by the compressor again.

[0043] In the refrigeration mode, the high-temperature and high-pressure refrigerant flowing out from the exhaust side of the compressor flows through the four-way valve to the outdoor heat exchanger for heat exchange, making it a liquid refrigerant. Then it flows through the main liquid pipe to the indoor heat exchanger side, and then through the branch liquid pipe to the indoor heat exchanger that needs refrigeration. It absorbs heat in the indoor heat exchanger to heat the room, making the refrigerant a low-pressure gaseous refrigerant. Then it flows through the low-pressure branch and the low-pressure main road to the suction side of the compressor, and is compressed by the compressor again.

[0044] The air-conditioning system further includes a control module, which is configured to be able to execute the control method of the air-conditioning system. As Figure 1 shown, the control method of the air-conditioning system includes the following main steps:

[0045] S0. Obtain the operating state of the air-conditioning system.

[0046] S1. Determine the number of compressors operating in each subsystem according to the operating state of the air-conditioning system.

[0047] "Determine the number of compressors operating in each subsystem according to the operating state of the air-conditioning system" includes the following detailed steps:

[0048] When the required heating or cooling capacity of the air-conditioning system increases, increase the total number of operating compressors;

[0049] When the required heating or cooling capacity of the air-conditioning system decreases, reduce the total number of operating compressors.

[0050] The change in heating or cooling capacity is related to the number of indoor heat exchangers turned on, and is also related to the heating temperature or cooling temperature of the indoor heat exchanger.

[0051] The number of operating compressors is not only related to the heating or cooling capacity, but also related to the defrosting method and defrosting capacity of the air-conditioning system. As long as the data of the operating state is a parameter related to the need to adjust the number of compressors, it can be used as a parameter for determining the number of compressors operating in each subsystem.

[0052] Among them, "determine the number of compressors operating in each subsystem" includes:

[0053] Determine the subsystem that needs to increase the number of operating compressors, and turn on the compressor with the shortest operating time in this subsystem.

[0054] "Determine the subsystem that needs to increase the number of operating compressors" includes:

[0055] When the number of compressors operating in each subsystem is different, and there is only one subsystem with the least number of compressors in operation, the subsystem that needs to increase the number of compressors in operation is the subsystem with the least number of compressors in operation. That is, turn on the compressor with the shortest running time in the subsystem with the least number of compressors in operation. This way of turning on can increase the total compressor load of the subsystem with the least number of compressors turned on, make the compressor loads of each subsystem tend to be the same, and reduce the gap between each subsystem. Moreover, since the compressor with the shortest running time is turned on, the difference in the running times of each compressor can be reduced, and the running times of all compressors in the entire system tend to be the same.

[0056] "Determining the subsystem that needs to increase the number of compressors in operation" also includes:

[0057] When the number of compressors operating in each subsystem is different, and there are multiple subsystems with the least number of compressors in the running state, the subsystem where the compressor with the shortest running time in the multiple subsystems with the least number of compressors in operation is located is the subsystem that needs to increase the number of compressors in operation. That is, turn on the compressor with the shortest running time in all subsystems with the least number of compressors in the running state. This way of turning on can increase the total compressor load of the subsystem with the least number of compressors turned on, make the compressor loads of each subsystem tend to be the same, and reduce the gap between each subsystem. Moreover, since the compressor with the shortest running time is turned on, the difference in the running times of each compressor can be reduced, and the running times of all compressors in the entire system tend to be the same.

[0058] "Determining the subsystem that needs to increase the number of compressors in operation" also includes:

[0059] When the number of compressors operating in each subsystem is the same, the subsystem where the compressor with the shortest running time in all subsystems is located is the subsystem that needs to increase the number of compressors in operation. That is, turn on the compressor with the shortest running time among all the compressors in the closed state. By turning on the compressor with the shortest running time, the difference in the running times of each compressor can be reduced, and the running times of all compressors in the entire system tend to be the same.

[0060] During the process of turning on the compressor, if there is only one compressor in the closed state within a subsystem, then this compressor is the compressor with the shortest running time.

[0061] The fact that the number of compressors operating in each subsystem is the same includes that all subsystems already have compressors in the on state and the number of compressors turned on is the same; the fact that the number of compressors operating in each subsystem is the same also includes that all the compressors in all subsystems are in the off state.

[0062] The subsystem for increasing the number of compressors in operation turns on only one compressor at a time for operation; if the increased compressors cannot meet the target state of the air-conditioning system, after a preset time interval, the subsystem for determining the need to increase the number of compressors in operation is determined again, and the compressor with the shortest operation duration in this subsystem is turned on. That is, another compressor is turned on.

[0063] During the process of determining the subsystem for increasing the number of compressors in operation, when a compressor fails and all the normal compressors in the subsystem where the failed compressor is located have been turned on, and the air-conditioning system needs to increase the number of compressors in operation, then this subsystem will no longer participate in the judgment. That is, when determining the total number of compressors that need to be turned on, this subsystem will no longer participate in the comparison of the number and turning on the compressors in this subsystem. This setting method can avoid dead loops, resulting in the inability to turn on new compressors and the failure to meet the refrigeration or heating capacity of the air-conditioning system.

[0064] "Determining the number of compressors in operation for each subsystem" includes:

[0065] Determining the subsystem for reducing the number of compressors in operation and turning off the compressor with the longest operation duration in this subsystem.

[0066] "Determining the subsystem for reducing the number of compressors in operation" includes:

[0067] When the number of compressors in operation for each subsystem is different and there is only one subsystem with the largest number of compressors in operation, then the subsystem for reducing the number of compressors in operation is the subsystem with the largest number of compressors in operation. That is, turning off the compressor with the longest operation duration in the subsystem with the largest number of compressors in operation. This turning-off method can reduce the total compressor load of the subsystem with the largest number of compressors turned on, make the compressor loads of each subsystem tend to be the same, and reduce the gap between each subsystem. Moreover, the compressor with the longest operation duration is turned off, which can reduce the gap in the operation duration of each compressor and make the operation durations of all compressors in the entire system tend to be the same.

[0068] "Determining the subsystem for reducing the number of compressors in operation" also includes:

[0069] When the number of compressors operating in each subsystem is different, and there are multiple subsystems with the largest number of operating compressors, the subsystem where the compressor with the longest operating duration is located among the multiple subsystems with the largest number of operating compressors is the subsystem that needs to reduce the number of operating compressors. Shut down the compressor with the longest operating duration among all the subsystems with the largest number of operating compressors. This shutdown method can reduce the total compressor load of the subsystem with the largest number of operating compressors, make the compressor loads of each subsystem tend to be the same, and reduce the gap between each subsystem. Moreover, by shutting down the compressor with the longest operating duration among all the subsystems with the largest number of operating compressors, the gap in the operating durations of each compressor can be reduced, and the operating durations of all the compressors in the entire system can tend to be the same.

[0070] "Determining the subsystem that needs to reduce the number of operating compressors" also includes:

[0071] When the number of compressors operating in each subsystem is the same, the subsystem where the compressor with the longest operating duration is located among all the subsystems is the subsystem that needs to reduce the number of operating compressors. Shut down the compressor with the longest operating duration among all the compressors in the operating state. By shutting down the compressor with the longest operating duration among all the operating compressors, the gap in the operating durations of each compressor can be reduced, and the operating durations of all the compressors in the entire system can tend to be the same.

[0072] During the process of shutting down the compressor, if there is only one operating compressor in the subsystem, then this compressor is the compressor with the longest operating duration.

[0073] For the subsystem that reduces the number of operating compressors, only one compressor is shut down each time; if the reduced compressors cannot meet the target state of the air-conditioning system, then after a preset time interval, continue to determine the subsystem that needs to reduce the number of operating compressors, and shut down the compressor with the longest operating duration in this subsystem. That is, shut down one more compressor.

[0074] Through this control, the operating durations of all the compressors in the air-conditioning system can tend to be the same, ensuring that the energy efficiency and response speed of the air-conditioning system are relatively stable, and also ensuring that the service lives of each compressor are basically the same, thus ensuring the stability of the air-conditioning system.

[0075] As Figure 2 shown, the control method of this air-conditioning system specifically includes the following steps:

[0076] S11. Determine whether it is necessary to increase the number of operating compressors; if so, proceed to step S12; if not, proceed to step S17;

[0001] S12. Determine whether the number of operating compressors in all subsystems is the same; if so, proceed to step S13; if not, proceed to step S14;

[0002] S13. Turn on the compressor with the shortest running time among all the compressors in the off state.

[0003] S14. Determine whether there are multiple subsystems with the fewest number of compressors running. If so, proceed to step S15; if not, proceed to step S16.

[0004] S15. Turn on the compressor with the shortest running time among all the compressors in the subsystem with the fewest number of compressors running.

[0005] S16. Turn on the compressor with the shortest running time within the subsystem with the fewest number of compressors running.

[0006] S17. Determine whether it is necessary to reduce the number of compressors running. If so, proceed to step S18;

[0007] S18. Determine whether the number of compressors running in all subsystems is the same. If so, proceed to step S19; if not, proceed to step S20;

[0008] S19. Turn off the compressor with the longest running time among all the compressors in the running state.

[0009] S20. Determine whether there are multiple subsystems with the most number of compressors running. If so, proceed to step S21; if not, proceed to step S22;

[0010] S21. Turn off the compressor with the longest running time among all the compressors in the subsystem with the most number of compressors running.

[0011] S22. Turn off the compressor with the longest running time within the subsystem with the most number of compressors running.

[0012] The control method of the air conditioner will be described in detail below by taking two subsystems, each including multiple compressors, as an example. The two subsystems are the first subsystem and the second subsystem respectively. As Figure 3 shown, the control method includes the following detailed steps:

[0013] S31. Determine whether it is necessary to increase the number of compressors running. If so, proceed to step S32; if not, proceed to step S37;

[0014] S32. Determine whether the number of compressors running in the first subsystem is greater than the number of compressors running in the second subsystem. If so, proceed to step S33; if not, proceed to step S34;

[0015] S33. Turn on the compressor with the shortest running time among all the compressors in the off state within the second subsystem.

[0016] S34. Determine whether the number of compressors running in the first subsystem is equal to the number of compressors running in the second subsystem; if so, proceed to step S35; if not, proceed to step S36.

[0017] S35. Turn on the compressor with the shortest running time among all the compressors in the off state in the first subsystem and the second subsystem.

[0018] S36. Turn on the compressor with the shortest running time in the first subsystem.

[0019] S37. Determine whether the number of compressors running needs to be reduced; if so, proceed to step S38.

[0020] S38. Determine whether the number of compressors running in the first subsystem is greater than the number of compressors running in the second subsystem; if so, proceed to step S39; if not, proceed to step S30.

[0021] S39. Turn off the compressor with the longest running time in the first subsystem.

[0022] S40. Determine whether the number of compressors running in the first subsystem is equal to the number of compressors running in the second subsystem; if so, proceed to step S41; if not, proceed to step S42.

[0023] S41. Turn off the compressors with the longest running time in the first subsystem and the second subsystem.

[0024] S42. Turn off the compressor with the longest running time in the second subsystem.

[0025] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. A control method for an air conditioning system, the air conditioning system comprising a plurality of subsystems, the subsystems comprising a plurality of compressors, characterized in that, The control method of the air conditioning system includes: Determine the number of compressors operating in each of the subsystems according to the operating state of the air conditioning system.

2. The control method of the air conditioning system according to claim 1, wherein, "Determine the number of compressors operating in each of the subsystems" includes: Determine the subsystem that needs to increase the number of compressors in operation, and turn on the compressor with the shortest operating duration in this subsystem.

3. The control method of the air conditioning system according to claim 2, characterized in that, "Determine the subsystem that needs to increase the number of compressors in operation" includes: When the number of compressors operating in each of the subsystems is different, and there is only one subsystem with the least number of compressors in operation, then the subsystem that needs to increase the number of compressors in operation is the subsystem with the least number of compressors in operation.

4. The control method of the air conditioning system according to claim 2, characterized in that "Determine the subsystem that needs to increase the number of compressors in operation" includes: When the number of compressors operating in each of the subsystems is different, and there are multiple subsystems with the least number of compressors in operation, then the subsystem where the compressor with the shortest operating duration among the multiple subsystems with the least number of compressors in operation is located is the subsystem that needs to increase the number of compressors in operation.

5. The control method of the air conditioning system according to claim 2, characterized in that, "Determine the subsystem that needs to increase the number of compressors in operation" includes: When the number of compressors operating in each of the subsystems is the same, then the subsystem where the compressor with the shortest operating duration among all the subsystems is located is the subsystem that needs to increase the number of compressors in operation.

6. The control method of the air conditioning system according to any one of claims 2-5, characterized in that, During the process of determining the subsystem that needs to increase the number of compressors in operation, when a compressor fails and all the normal compressors in the subsystem where the faulty compressor is located have been turned on, and the air conditioning system needs to increase the number of compressors in operation, then this subsystem will no longer participate in the judgment.

7. The control method of the air conditioning system according to claim 1, characterized in that "Determine the number of compressors operating in each of the subsystems" includes: Determine the subsystem that needs to reduce the number of compressors in operation, and turn off the compressor with the longest operating duration in this subsystem.

8. The control method of the air conditioning system according to claim 7, characterized in that, "Determine the subsystem that needs to reduce the number of compressors in operation" includes: When the number of compressors operating in each of the subsystems is different, and there is only one subsystem with the most number of compressors in operation, then the subsystem that needs to reduce the number of compressors in operation is the subsystem with the most number of compressors in operation.

9. The control method of the air conditioning system according to claim 7, characterized in that, "Determine the subsystem that needs to reduce the number of compressors in operation" includes: When the number of compressors operating in each of the subsystems is different, and there are multiple subsystems with the most number of compressors in operation, then the subsystem where the compressor with the longest operating duration among the multiple subsystems with the most number of compressors in operation is located is the subsystem that needs to reduce the number of compressors in operation.

10. The control method of the air conditioning system according to claim 7, wherein "Determine the subsystem that needs to reduce the number of compressors in operation" includes: When the number of compressors operating in each of the subsystems is the same, then the subsystem where the compressor with the longest operating duration among all the subsystems is located is the subsystem that needs to reduce the number of compressors in operation.

11. An air conditioning system, characterized in that, The air conditioning system includes a control module and a plurality of subsystems. The subsystems include a plurality of compressors. The control module is configured to be capable of executing the control method of the air conditioning system according to any one of claims 1-10.

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