Refrigerating system, control method of refrigerating system and storage medium

Abstract

The invention provides a refrigerating system. The refrigerating system comprises a first throttling device control mode setting module and a first throttling device control module. The first throttling device control mode setting module receives at least one parameter associated with operation of the compressor, determines whether the at least one parameter indicates that the compressor is under a preset surge protection condition, and selects between a normal control mode and a surge protection control mode based on the determination. The first throttling device control module responds to the normal control mode selected by the first throttling device control mode setting module and controls the first throttling device in the normal control mode, and responds to the surge protection control mode selected by the first throttling device control mode setting module and controls the first throttling device in the surge protection control mode. And the first throttling device is controlled in a surge protection control mode.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration systems, and specifically to a refrigeration system, a control method for a refrigeration system, and a computer-readable storage medium. Background Art

[0002] Conventional refrigeration systems face challenges in controlling the liquid levels in the condenser and economizer, as well as preventing compressor surge. While various solutions have been proposed, most suffer from poor control accuracy or complex structures, resulting in high manufacturing costs. Summary of the Invention

[0003] The present application aims to provide a refrigeration system, a control method for a refrigeration system, and a computer-readable storage medium, so as to at least solve or alleviate some of the problems existing in the prior art.

[0004] In a first aspect, the present application provides a refrigeration system comprising: a compressor, a condenser, an economizer, an evaporator, a first throttling device, and a second throttling device. The compressor has a discharge port, a first suction port, and a second suction port. The condenser inlet is connected to the compressor discharge port. The evaporator outlet is connected to the compressor first suction port. The economizer inlet is connected to the condenser outlet, the economizer gas outlet is connected to the compressor second suction port, and the economizer liquid outlet is connected to the evaporator inlet. The first throttling device is disposed in the piping connecting the condenser and the economizer. The second throttling device is disposed in the piping connecting the economizer and the evaporator.

[0005] The refrigeration system further includes a first throttle device control mode setting module and a first throttle device control module. The first throttle device control mode setting module receives at least one parameter associated with the operation of the compressor, determines whether the at least one parameter indicates that the compressor is under a preset surge protection condition, and selects between a normal control mode and a surge protection control mode based on the determination. In response to the first throttle device control mode setting module selecting the normal control mode, the first throttle device control module controls the first throttle device in the normal control mode. In response to the first throttle device control mode setting module selecting the surge protection control mode, the first throttle device control module controls the first throttle device in the surge protection control mode.

[0006] In the refrigeration system of the optional technical solution, the condenser is provided with a first liquid level sensor that detects the current liquid level of the condenser. In normal control mode, the first throttling device control module receives the current condenser liquid level information from the first liquid level sensor and controls the opening of the first throttling device based on a comparison result of the current condenser liquid level information and a target condenser liquid level.

[0007] In the refrigeration system of the optional technical solution, the first throttling device control module controls the opening of the first throttling device to increase the refrigerant gas suction amount of the second suction port in the surge protection control mode.

[0008] In the refrigeration system of the optional technical solution, when switching from the normal control mode to the surge protection control mode, the first throttling device control module controls the opening of the first throttling device to increase.

[0009] In the refrigeration system of an optional technical solution, the at least one parameter includes a water head of the refrigeration system.

[0010] In the refrigeration system of the optional technical solution, the first throttling device control mode setting module selects the surge protection control mode when the water head of the refrigeration system is greater than a threshold value.

[0011] In the refrigeration system of the optional technical solution, the economizer is provided with a second liquid level sensor that detects the current liquid level of the economizer. The refrigeration system also includes a second throttling device control module that receives information about the current liquid level of the economizer from the second liquid level sensor and controls the opening of the second throttling device based on a comparison between the current liquid level information and a target liquid level of the economizer.

[0012] In the refrigeration system of an optional technical solution, the first throttling device and / or the second throttling device is an electric butterfly valve.

[0013] A second aspect of the present application provides a control method for a refrigeration system. The refrigeration system includes: a compressor, a condenser, an economizer, an evaporator, a first throttling device, and a second throttling device. The compressor has a discharge port, a first suction port, and a second suction port. The condenser inlet is connected to the compressor discharge port. The evaporator outlet is connected to the compressor first suction port. The economizer inlet is connected to the condenser outlet, the economizer gas outlet is connected to the compressor second suction port, and the economizer liquid outlet is connected to the evaporator inlet. The first throttling device is disposed in the piping connecting the condenser and the economizer. The second throttling device is disposed in the piping connecting the economizer and the evaporator. The control method includes the following steps: receiving at least one parameter associated with compressor operation; determining whether the at least one parameter indicates that the compressor is under a preset surge protection condition; and selecting between a normal control mode and a surge protection control mode based on the determination. In response to selecting the normal control mode, the first throttling device is controlled in the normal control mode. In response to selecting the surge protection control mode, the first throttling device is controlled in the surge protection control mode.

[0014] In the refrigeration system control method of an optional technical solution, in the step of "controlling the first throttling device in a normal control mode," the opening of the first throttling device is controlled based on a comparison result between the current liquid level information of the condenser and the target liquid level of the condenser. In the step of "controlling the first throttling device in a surge protection control mode," the opening of the first throttling device is controlled to increase the amount of refrigerant gas sucked into the second suction port.

[0015] In the control method of the refrigeration system of the optional technical solution, in the step of "controlling the first throttling device in the surge protection control mode", when switching from the normal control mode to the surge protection control mode, the opening of the first throttling device is controlled to increase.

[0016] The control method of the refrigeration system of the optional technical solution further includes the following steps: controlling the opening of the second throttling device based on the comparison result of the current liquid level information of the economizer and the target liquid level of the economizer.

[0017] A third aspect of the present application provides a computer-readable storage medium storing processor-readable instructions. When the control program is executed by the processor, the control method of the refrigeration system in any of the above-mentioned optional technical solutions is implemented.

[0018] According to the refrigeration system, the control method of the refrigeration system, and the computer-readable storage medium of the present application, the demand for compressor surge protection is met with a solution with a relatively simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a refrigeration system according to an embodiment of the present application is shown;

[0020] Figure 2 A schematic diagram of a refrigeration system according to an embodiment of the present application is shown;

[0021] Figure 3 A flow chart showing a method for controlling a refrigeration system according to an embodiment of the present application is shown;

[0022] Figure 4 A schematic diagram of the control areas of the first throttling device corresponding to the normal control mode and the surge protection control mode according to an embodiment of the present application is shown.

[0023] Figure numerals: refrigeration system 100, compressor 1, discharge port 12, second suction port 13, first suction port 14, condenser 2, first liquid level sensor 21, condenser inlet 22, condenser outlet 23, economizer 3, second liquid level sensor 31, economizer inlet 32, economizer gas outlet 33, economizer liquid outlet 34, evaporator 4, evaporator inlet 41, evaporator outlet 42, first throttling device 5, second throttling device 6, control device 7, first throttling device control mode setting module 71, first throttling device control module 72, second throttling device control module 73. DETAILED DESCRIPTION

[0024] First of all, it should be noted that the following will illustrate the composition, working principle, characteristics and advantages of the refrigeration system, the control method of the refrigeration system, and the computer-readable storage medium according to the present application in an illustrative manner, but it should be understood that all descriptions are given for illustration only and should not be understood as forming any limitation on the present application.

[0025] In addition, for any single technical feature described or implied in the embodiments mentioned in this document, or any single technical feature shown or implied in the accompanying drawings, this application still allows for continued arbitrary combination or deletion between these technical features (or their equivalents) without any technical obstacles, thereby obtaining more other embodiments of the present application that may not be directly mentioned in this document.

[0026] <Refrigeration System>

[0027] Figure 1 A refrigeration system 100 according to an embodiment of the present application is shown, comprising a compressor 1, a condenser 2, an economizer 3, and an evaporator 4 connected by refrigerant circulation piping. Compressor 1 has a discharge port 12, a second suction port 13, and a first suction port 14. The inlet 22 of condenser 2 communicates with the discharge port 12 of compressor 1. The inlet 32 ​​of economizer 3 communicates with the outlet 23 of condenser 2, and the gas outlet 33 of economizer 3 communicates with the second suction port 13 of compressor 1. The inlet 41 of evaporator 4 communicates with the liquid outlet 34 of economizer 3, and the outlet 42 of evaporator 4 communicates with the first suction port 14 of compressor 1. A first throttling device 5 is provided in the piping connecting condenser 2 and economizer 3. A second throttling device 6 is provided in the piping connecting economizer 3 and evaporator 4.

[0028] The types and specifications of compressor 1, condenser 2, economizer 3, and evaporator 4 can be appropriately selected from existing known types and specifications. As a specific example, compressor 1 is a centrifugal compressor. Condenser 2 and evaporator 4 are both shell-and-tube heat exchangers, with the refrigerant flowing through the shell side and the working fluid flowing through the tube side. Economizer 3 is a flash evaporator.

[0029] refer to Figure 1 and Figure 2 The refrigeration system 100 further includes a first throttling device control mode setting module 71 and a first throttling device control module 72 .

[0030] The first throttle device control mode setting module 71 receives at least one parameter associated with the operation of the compressor 1, determines whether the at least one parameter indicates that the compressor 1 is in a preset surge protection condition, and selects between a normal control mode and a surge protection control mode based on the determination. In response to the first throttle device control mode setting module 71 selecting the normal control mode, the first throttle device control module 72 controls the opening of the first throttle device 5 in the normal control mode. In response to the first throttle device control mode setting module 71 selecting the surge protection control mode, the first throttle device control module 72 controls the opening of the first throttle device 5 in the surge protection control mode.

[0031] In some embodiments, reference Figure 4 , at least one parameter includes the water head of the refrigeration system 100. Corresponding to the corresponding system load rate, when the water head of the refrigeration system 100 is greater than the threshold value ( Figure 4 ), which means that at this head, the compressor 1 will be affected by surge or has already been affected by surge. At this time, the first throttling device control mode setting module 71 selects the surge protection control mode, and the first throttling device control module 72 controls the first throttling device 5 in the surge protection control mode in response to the selection of the first throttling device control mode setting module 71, specifically by adjusting and increasing the opening of the first throttling device 5 so that the amount of refrigerant entering the economizer 3 is appropriately increased. When other operating conditions of the condenser 2 (such as the inlet water temperature and inlet water volume or the inlet air temperature or inlet air volume) remain unchanged, more refrigerant will flow into the economizer 3 and then can enter the second suction port 13 of the compressor in the state of gaseous refrigerant after being vaporized in the economizer 3, thereby increasing the air intake of the compressor 1 and preventing it from entering surge. Similarly, corresponding to the corresponding system load rate, when the water head of the refrigeration system 100 is less than the threshold value ( Figure 4 The black area in the figure indicates that at this head, the compressor 1 is not susceptible to surge. At this point, the first throttle device control mode setting module 71 selects the normal control mode. In response to this selection by the first throttle device control mode setting module 71, the first throttle device control module 72 controls the first throttle device 5 in the normal control mode.

[0032] It should be noted that the "threshold" mentioned above is based on the system load at the moment of obtaining the "water lift of the refrigeration system 100". Figure 4In the illustrated embodiment, the “threshold” may be different under different system loads.

[0033] In other embodiments, the at least one parameter received by the first throttling device control mode setting module 71 may also include a detection result of a surge detector provided in the compressor 1. When the detection result is greater than a threshold value, that is, indicating that the compressor 1 is under a preset surge protection condition, the first throttling device control mode setting module 71 selects the surge protection control mode.

[0034] In other embodiments, the at least one parameter received by the first throttling device control mode setting module 71 may also include the operating point of the compressor 1. When the operating point of the compressor 1 is close to the surge area of ​​the compressor 1, indicating that the compressor 1 is under a preset surge protection condition, the first throttling device control mode setting module 71 selects the surge protection control mode.

[0035] In some embodiments, the first throttling device control mode setting module 71 has two outputs, namely, an output for selecting the normal control mode and an output for selecting the surge protection mode.

[0036] In other embodiments, the first throttle device control mode setting module 71 has three outputs: an output selecting the surge protection mode, an output selecting the normal control mode, and an output selecting the balancing control mode. In other words, the first throttle device control mode setting module 71 can generate multiple different outputs through multiple decision logics and send these outputs to the first throttle device control module 72.

[0037] In some embodiments, the condenser 2 is provided with a first liquid level sensor 21, which detects the current liquid level of the condenser 2 and sends the current liquid level information of the condenser 2 to the first throttling device control module 72. In the normal control mode, the first throttling device control module 72 controls the opening of the first throttling device 5 based on the comparison result of the current liquid level information of the condenser 2 and the target liquid level of the condenser 2.

[0038] By controlling the opening of the first throttling device 5 disposed downstream of the condenser 2, the liquid level in the condenser 2 can be controlled to be within a position or region closer to the target liquid level. This allows for optimization of the liquid level in the condenser 2, allowing for quick adjustment of the load on the condenser 2 in response to changes in operating conditions and balancing the performance of the refrigeration system 100. Furthermore, by receiving the current liquid level information of the condenser 2, when a fault occurs in the first throttling device 5, the fault can be identified by detecting an abnormality in the current liquid level information of the condenser 2.

[0039] The first liquid level sensor 21 can be selected from various types of sensors, such as a float type liquid level sensor, a pressure type liquid level sensor, a capacitive type liquid level sensor, etc. In some embodiments, selecting a capacitive type liquid level sensor as the first liquid level sensor 21 facilitates rapid and reliable liquid level detection for refrigerants with different characteristics.

[0040] The comparison method between the current liquid level information of the condenser 2 and the target liquid level of the condenser 2 , as well as the control method of the first throttling device 5 , can be set according to needs.

[0041] For example, when the current liquid level information of the condenser 2 indicates that the current liquid level of the condenser 2 is lower than the target liquid level of the condenser 2, the opening of the first throttling device 5 is reduced. When the current liquid level information of the condenser 2 indicates that the current liquid level of the condenser 2 is higher than the target liquid level of the condenser 2, the opening of the first throttling device 5 is increased.

[0042] For another example, when the current liquid level information of the condenser 2 indicates that the current liquid level of the condenser 2 is lower than the target liquid level of the condenser 2, and the difference between the current liquid level of the condenser 2 and the target liquid level of the condenser 2 is greater than a threshold, the opening of the first throttling device 5 is reduced. When the current liquid level information of the condenser 2 indicates that the current liquid level of the condenser 2 is higher than the target liquid level of the condenser 2, and the difference between the current liquid level of the condenser 2 and the target liquid level of the condenser 2 is greater than a threshold, the opening of the first throttling device 5 is increased.

[0043] Although in the above embodiment, the first throttling device control module 72 adjusts the first throttling device 5 in the normal control mode based on the purpose of controlling the liquid level in the condenser 2, the present application is not limited to this. For example, in an alternative embodiment, the first throttling device control module 72 adjusts the first throttling device 5 in the normal control mode based on the purpose of controlling the saturation temperature of the evaporator 4. In another alternative embodiment, the first throttling device control module 72 adjusts the first throttling device 5 in the normal control mode based on the purpose of balancing the liquid levels in the condenser 2 and the economizer 3.

[0044] In some embodiments, the first throttling device control module 72 controls the opening of the first throttling device 5 in the surge protection control mode to increase the refrigerant gas suction amount of the second suction port 13 .

[0045] In some embodiments, when the first throttling device control module 72 switches from the normal control mode to the surge protection control mode, the opening degree of the first throttling device 5 is controlled and increased. In this way, the amount of refrigerant gas sucked into the second suction port 13 can be increased to protect the compressor 1 from further surge.

[0046] It should be noted that, in order to increase the amount of refrigerant gas sucked into the second suction port 13 of the compressor 1, the first throttling device 5 is generally controlled by increasing the opening of the first throttling device 5. Of course, depending on the original state of the first throttling device 5, the first throttling device 5 may also be adjusted by maintaining the opening of the first throttling device 5 while, for example, reducing the load on the compressor 1, or by making the opening of the first throttling device 5 larger than the normal required opening, or the first throttling device 5 and the second throttling device 6 may be adjusted in conjunction with each other. In other words, the first throttling device 5 is controlled for the purpose of increasing the amount of refrigerant gas sucked into the second suction port 13 of the compressor 1, and the specific control method can be carried out according to actual conditions.

[0047] The surge protection control mode allows the first throttling device 5 to be used to simply implement surge protection for the compressor 1, eliminating the need for separate piping equipment such as a hot gas bypass valve. This simplifies the structure of the refrigeration system 100, thereby reducing the failure rate and production costs of the refrigeration system 100.

[0048] In some embodiments, in the surge protection control mode, the first throttling device 5 is maintained at a fixed and relatively large opening to simplify the control logic of the surge protection mode.

[0049] In other embodiments, in the surge protection control mode, the first throttling device 5 is maintained within a relatively large opening range to take into account other control purposes such as controlling the liquid level in the condenser 2 .

[0050] In some embodiments, the economizer 3 is provided with a second liquid level sensor 31 that detects the current liquid level of the economizer 3. The refrigeration system 100 further includes a second throttling device control module 73. The second throttling device control module 73 receives the current liquid level information of the economizer 3 from the second liquid level sensor 31 and controls the opening of the second throttling device 6 based on a comparison result between the current liquid level information of the economizer 3 and the target liquid level of the economizer 3.

[0051] By controlling the opening of the second throttling device 6, located downstream of the economizer 3, the liquid level in the economizer 3 can be controlled to a position or region closer to the target liquid level. This optimizes the liquid level in the economizer 3 and thereby better balances the performance of the refrigeration system 100. Furthermore, by receiving the current liquid level information of the economizer 3, when a fault occurs in the second throttling device 6, the fault can be identified by detecting an abnormality in the current liquid level information of the economizer 3.

[0052] The second liquid level sensor 31 can be selected from various types of sensors such as a float type liquid level sensor, a pressure type liquid level sensor, a capacitive type liquid level sensor, etc. In some embodiments, the second liquid level sensor 31 is the same type of liquid level sensor as the first liquid level sensor 21 .

[0053] The method for comparing the current liquid level information of the economizer 3 and the target liquid level of the economizer 3 and the method for controlling the second throttling device 6 can be set by referring to the method for comparing the current liquid level information of the condenser 2 and the target liquid level of the condenser 2 and the method for controlling the first throttling device 5 introduced above, and will not be repeated here.

[0054] In some embodiments, the second throttle device control module 73 controls the second throttle device 6 in a single control mode.

[0055] In other embodiments, the second throttle device control module 73 controls the second throttle device 6 in the form of switching between multiple control modes.

[0056] In some embodiments, reference Figure 1 and Figure 2 The refrigeration system 100 includes a control device 7, which includes a first throttling device control mode setting module 71, a first throttling device control module 72, and a second throttling device control module 73. The first throttling device 5, the second throttling device 6, the first liquid level sensor 21, and the second liquid level sensor 31 are all communicatively coupled to the control device 7. Of course, Figure 1 and Figure 2 This is only an example. As long as the first throttling device control mode setting module 71, the first throttling device control module 72 and the second throttling device control module 73 can implement corresponding information reception and information processing, they are all within the technical scope of the present application.

[0057] In some embodiments, both the first throttling device 5 and the second throttling device 6 are electric butterfly valves. Electric butterfly valves have the characteristics of rapid response and can provide precise flow control. The use of electric butterfly valves facilitates a more timely response of the first throttling device 5 and the second throttling device 6 to the real-time liquid level conditions within the condenser 2 and the economizer 3, respectively. In other words, electric butterfly valves are particularly suitable for use in scenarios where flow control is the purpose. In some embodiments where flow control is not required, an expansion valve or other type of throttling component can also be selected as the first throttling device 5 and / or the second throttling device 6.

[0058] <Control Method of Refrigeration System>

[0059] According to the control method of the refrigeration system 100 in the embodiment of the present application, refer to Figure 3The method includes the following steps: receiving at least one parameter associated with the operation of the compressor 1; determining whether the at least one parameter indicates that the compressor 1 is in a preset surge protection condition; selecting between a normal control mode and a surge protection control mode based on the determination; controlling the first throttling device 5 in the normal control mode in response to selecting the normal control mode; and controlling the first throttling device 5 in the surge protection control mode in response to selecting the surge protection control mode.

[0060] In some embodiments, in the step of "controlling the first throttling device 5 in a normal control mode," the opening of the first throttling device 5 is controlled based on a comparison result between the current liquid level information of the condenser 2 and the target liquid level of the condenser 2. In the step of "controlling the first throttling device 5 in a surge protection control mode," the opening of the first throttling device 5 is controlled to increase the amount of refrigerant gas sucked into the second suction port 13.

[0061] In some embodiments, during the step of "controlling the first throttling device 5 in the surge protection control mode," when switching from the normal control mode to the surge protection control mode, the opening of the first throttling device 5 is controlled to increase. In this case, even if the normal control mode instructs a decrease in the opening of the first throttling device 5 based on the current liquid level information of the condenser 2, if the surge protection control mode is also satisfied, the instruction of the surge protection control mode takes precedence, i.e., the opening of the first throttling device 5 is increased.

[0062] In some embodiments, the method further includes the following steps: controlling the opening of the second throttling device 6 based on a comparison result between the current liquid level information of the economizer 3 and the target liquid level of the economizer 3 .

[0063] <Computer-readable storage medium>

[0064] According to the computer-readable storage medium in the embodiments of the present application, a control program is stored. When the control program is executed by a processor, the control method of the refrigeration system introduced in some of the above embodiments is implemented.

[0065] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A refrigeration system comprising: A compressor having a discharge port, a first suction port, and a second suction port; a condenser, wherein the inlet of the condenser is connected to the exhaust port; an evaporator, wherein an outlet of the evaporator is in communication with the first suction port; an economizer, wherein the inlet of the economizer is communicated with the outlet of the condenser, the gas outlet of the economizer is communicated with the second suction port, and the liquid outlet of the economizer is communicated with the inlet of the evaporator; a first throttling device provided on a pipe connecting the condenser and the economizer; a second throttling device provided on a pipe connecting the economizer and the evaporator; It is characterized by further comprising: a first throttle device control mode setting module that receives at least one parameter associated with operation of the compressor, determines whether the at least one parameter indicates that the compressor is in a preset surge protection condition, and selects between a normal control mode and a surge protection control mode based on the determination; A first throttling device control module controls the first throttling device in the normal control mode in response to the first throttling device control mode setting module selecting the normal control mode, and controls the first throttling device in the surge protection control mode in response to the first throttling device control mode setting module selecting the surge protection control mode.

2. The refrigeration system according to claim 1, characterized in that The condenser is provided with a first liquid level sensor, which detects the current liquid level of the condenser. In the normal control mode, the first throttling device control module receives the current liquid level information of the condenser sent by the first liquid level sensor, and controls the opening of the first throttling device based on the comparison result of the current liquid level information of the condenser and the target liquid level of the condenser.

3. The refrigeration system according to claim 1, wherein: In the surge protection control mode, the first throttling device control module controls the opening of the first throttling device to increase the refrigerant gas suction amount of the second suction port.

4. The refrigeration system according to claim 3, characterized in that When switching from the normal control mode to the surge protection control mode, the first throttle device control module controls the opening degree of the first throttle device to increase.

5. The refrigeration system according to claim 1, wherein: The at least one parameter includes a water head of the refrigeration system.

6. The refrigeration system according to claim 5, characterized in that The first throttling device control mode setting module selects the surge protection control mode when the water head of the refrigeration system is greater than a threshold.

7. The refrigeration system according to claim 1, wherein: The economizer is provided with a second liquid level sensor, which detects the current liquid level of the economizer. The refrigeration system further comprises: The second throttling device control module receives the current liquid level information of the economizer sent by the second liquid level sensor, and controls the opening of the second throttling device based on a comparison result between the current liquid level information of the economizer and the target liquid level of the economizer.

8. The refrigeration system according to any one of claims 1 to 7, characterized in that: The first throttling device and / or the second throttling device is an electric butterfly valve.

9. A method for controlling a refrigeration system, the refrigeration system comprising: A compressor having a discharge port, a first suction port, and a second suction port; a condenser, wherein the inlet of the condenser is connected to the exhaust port; an evaporator, wherein an outlet of the evaporator is in communication with the first suction port; an economizer, wherein the inlet of the economizer is communicated with the outlet of the condenser, the gas outlet of the economizer is communicated with the second suction port, and the liquid outlet of the economizer is communicated with the inlet of the evaporator; a first throttling device provided on a pipe connecting the condenser and the economizer; a second throttling device provided on a pipe connecting the economizer and the evaporator; It is characterized in that the control method comprises the following steps: receiving at least one parameter associated with operation of the compressor; determining whether the at least one parameter indicates that the compressor is in a preset surge protection condition; selecting between a normal control mode and a surge protection control mode based on the determination; In response to selecting the normal control mode, controlling the first throttling device in the normal control mode; In response to selecting the surge protection control mode, the first throttling device is controlled in the surge protection control mode.

10. The control method of the refrigeration system according to claim 9, characterized in that: In the step of "controlling the first throttling device in the normal control mode", the opening of the first throttling device is controlled based on a comparison result between the current liquid level information of the condenser and the target liquid level of the condenser; In the step of "controlling the first throttle device in the surge protection control mode", the opening degree of the first throttle device is controlled to increase the refrigerant gas suction amount of the second suction port.

11. The control method of the refrigeration system according to claim 10, characterized in that: In the step of “controlling the first throttle device in the surge protection control mode”, when switching from the normal control mode to the surge protection control mode, the opening degree of the first throttle device is controlled to increase.

12. The control method of the refrigeration system according to claim 9, characterized in that: The following steps are also included: The opening degree of the second throttling device is controlled based on a comparison result between the current liquid level information of the economizer and the target liquid level of the economizer.

13. A computer-readable storage medium storing processor-readable instructions, characterized in that: When the processor-readable instructions are executed by the processor, the control method of the refrigeration system according to any one of claims 9 to 12 is implemented.

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