Control method and control device of refrigerator system and refrigerator system

Abstract

The invention provides a control method and device of a refrigerator system and the refrigerator system. The refrigerator system comprises a plurality of cooling circulation loops which are connected in parallel, and each cooling circulation loop comprises a unit and a waterway stop valve. The control method comprises the steps that according to the load change requirement of an application end, a unified control system conducts overall management on units of a plurality of cooling circulation loops so as to meet the load change requirement, and opening and closing of waterway stop valves in the corresponding cooling circulation loops are controlled according to starting and stopping of the units; when the refrigerator system is in the running state, the unified control system monitors whether the opening number of the waterway stop valves of the current refrigerator system meets the minimum valve opening number or not in real time; and when the minimum valve opening number is not met, the unified control system controls the waterway stop valves in the corresponding cooling circulation loops. According to the invention, the reliability problem of unit operation under the conditions of small load and large flow can be solved.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to a control method and a control device for a refrigeration system, and a refrigeration system. Background Art

[0002] Figure 1 A schematic structural diagram of a refrigeration system 100 is disclosed. Figure 1 As shown, the chiller system includes multiple parallel-connected cooling loops, each of which includes chillers 102 and water shut-off valves 103. Chiller system 100 can achieve both economical and reliable operation by shutting down chillers 102 in certain cooling loops when operating at partial load, based on load variations at the application end.

[0003] When the load on the application end becomes smaller, the water flow on the application end will decrease accordingly. In this variable water flow application chiller system 100, for a chiller system with a constant pressure difference, when the chiller system 100 is in a high flow and low load condition, the number of running units is small, and the pipeline flow will exceed the maximum flow allowed for the operation of the unit heat exchanger, causing vibration of the heat exchange tubes in the heat exchanger, thereby causing failure of the heat exchanger; in addition, when this variable water flow application chiller system 100 is in a low load application, the minimum flow allowed by the water pump exceeds the maximum flow allowed for the operation of the running unit heat exchanger. In both of the above scenarios, the reliability of the unit operation will be affected by the excessive flow. Summary of the Invention

[0004] The purpose of the present application is to provide a control method, a control device and a refrigeration system for a refrigeration system, which can solve the reliability problem of the unit operation under low load and high flow.

[0005] One aspect of the present application provides a control method for a refrigeration system. The refrigeration system includes a plurality of cooling circulation loops connected in parallel, and each cooling circulation loop includes a unit and a water shut-off valve. The control method includes: according to the load change requirements of the application end, a unified control system is used to comprehensively manage the units of the plurality of cooling circulation loops to match the load change requirements, and control the opening and closing of the water shut-off valves in the corresponding cooling circulation loops according to the start and stop of the units; when the refrigeration system is in operation, the unified control system monitors in real time whether the number of open water shut-off valves of the current refrigeration system meets the minimum number of open valves; when the minimum number of open valves is not met, the unified control system controls the water shut-off valves in the corresponding cooling circulation loops.

[0006] Furthermore, when the minimum number of valve openings is not met, the unified control system controls the water shut-off valves in the corresponding cooling circulation loop, including: when the current number of water shut-off valves opened is less than the minimum number of valve openings, the unified control system controls the water shut-off valves in the corresponding cooling circulation loop to open; when the current number of water shut-off valves opened is greater than the minimum number of valve openings, the unified control system controls the water shut-off valves in the corresponding cooling circulation loop to close.

[0007] Furthermore, when the current number of open water shut-off valves is less than the minimum number of open valves, the unified control system controls the opening of the water shut-off valves in the corresponding cooling circulation loop, including: when the current number of open water shut-off valves is less than the minimum number of open valves, the unified control system selects the water shut-off valves in the corresponding cooling circulation loop with the shortest compressor running time from the cooling circulation loop where the water shut-off valves that are currently in a closed state and are in an available state are located, and opens them; when the current number of open water shut-off valves is greater than the minimum number of open valves, the unified control system controls the closing of the water shut-off valves in the corresponding cooling circulation loop, including: when the current number of open water shut-off valves is greater than the minimum number of open valves, the unified control system selects the water shut-off valves in the corresponding cooling circulation loop with the longest compressor running time from the cooling circulation loop where the water shut-off valves that are currently in an open state and are in an available state are located, and closes them.

[0008] Furthermore, the control method further includes: when the water shut-off valve is in an unavailable state, the water shut-off valve in the unavailable state does not participate in the statistical calculation of the current on / off state of the water shut-off valve.

[0009] Furthermore, the number of water cut-off valves that need to be opened is controlled to be equal to the minimum valve opening number minus the current water cut-off valve opening number; the number of water cut-off valves that need to be closed is controlled to be equal to the current water cut-off valve opening number minus the minimum valve opening number.

[0010] Furthermore, the control method further includes: when any unit in the cooling circulation loop is started, the unified control system controls the water shut-off valves in all cooling circulation loops to remain in a fully open state.

[0011] Furthermore, the control method further includes: when all units in the cooling circulation loops are shut down, the unified control system controls the water shut-off valves in all cooling circulation loops to remain in a fully open state.

[0012] Another aspect of the present application provides a control device for a refrigeration system, comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the control method for the refrigeration system as described above.

[0013] Another aspect of the present application provides a chiller system. The chiller system includes a unified control system and multiple parallel-connected cooling circuits, each of which includes a unit and a water shut-off valve. The unified control system is configured to comprehensively manage the units in the multiple cooling circuits to match the load demand changes at the application end, and to control the opening and closing of the water shut-off valves in the corresponding cooling circuits based on the start and stop of the units. Furthermore, when the chiller system is in operation, the unified control system monitors in real time whether the number of currently opened water shut-off valves meets the minimum number of valves opened, and controls the water shut-off valves in the corresponding cooling circuits if the minimum number of valves opened is not met.

[0014] Furthermore, the unified control system is arranged in one of the units.

[0015] Furthermore, the units and water shut-off valves in the plurality of cooling circulation loops are communicatively connected to the unified control system via the Modbus communication protocol.

[0016] The control method, control device and chiller system of one or more embodiments of the present application can monitor the number of water shut-off valves currently opened in real time during the operation of the chiller system, and can control the water shut-off valves in the corresponding cooling circulation loop according to the minimum number of valve openings, thereby solving the reliability problem of the chiller system unit operation under small load and large flow.

[0017] In addition, the control method, control device and chiller system of one or more embodiments of the present application can perform two-level control of the water shut-off valve from the unit level and the loop level. However, the loop level control of the water shut-off valve has a higher priority than the unit level control. Thus, it can be ensured that the loop level control and the unit level control of the water shut-off valve are essentially not interfered with, and further, the consistency of the software implementation with and without variable water flow control function can be ensured. Regardless of whether the chiller system requires variable water flow application, the same set of software algorithms can be used. The software can be adapted to both variable water flow and non-variable water flow applications, as long as the function is selected in the application configuration.

[0018] The refrigeration system of one or more embodiments of the present application adopts a unified control system to comprehensively manage and control the units and water shut-off valves in multiple cooling circulation loops, and its structural layout is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a cooling system.

[0020] Figure 2 This is a schematic structural diagram of a refrigeration system according to an embodiment of the present application.

[0021] Figure 3 This is a structural diagram of a refrigeration system according to another embodiment of the present application.

[0022] Figure 4 This is a flow chart of a control method for a refrigeration system according to one embodiment of the present application.

[0023] Figure 5 This is a flow chart of unit-level control of a water shut-off valve according to an embodiment of the present application.

[0024] Figure 6 A schematic diagram of a flow chart for performing loop-level control on a water shut-off valve according to an embodiment of the present application.

[0025] Figure 7 This is a schematic block diagram of a control device for a refrigeration system according to an embodiment of the present application. DETAILED DESCRIPTION

[0026] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of devices consistent with certain aspects of the present application, as detailed in the appended claims.

[0027] The control method, control device and chiller system of the present application are described in detail below with reference to the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0028] The present application provides a refrigeration system. Figure 2 The schematic diagram of the structure of a refrigeration system according to an embodiment of the present application is disclosed. Figure 2 As shown, a chiller system according to an embodiment of the present application includes a unified control system 201 and multiple cooling loops connected in parallel, each of which includes a unit 202 and a water shut-off valve 203. The unified control system 201 can control the units 202 and water shut-off valves 203 in the multiple cooling loops accordingly.

[0029] In some embodiments, the units 202 and water shut-off valves 203 in the multiple cooling loops of the present application can be connected to the unified control system 201 via the Modbus communication protocol. Thus, the unified control system 201 implements the overall management and control of the multiple units 202 connected in parallel.

[0030] The unified control system 201 can coordinate and manage the units 202 of multiple cooling circuits to match the load changes based on the load demand of the application end, and control the opening and closing of the water shut-off valves 203 in the corresponding cooling circuits based on the start and stop of the units 202. In addition, when the chiller system is in operation, the unified control system 201 can monitor in real time whether the number of open water shut-off valves 203 currently opened meets the minimum number of valves opened, and control the water shut-off valves 203 in the corresponding cooling circuits if the minimum number of valves opened is not met.

[0031] exist Figure 2 In the embodiment shown, the unified control system 201 can be set in one of the units 202. Figure 2 In the embodiment, the unified control system 201 is set in the 1# unit 202. The unit 202 equipped with the unified control system 201 plays the role of the master unit, and the other units 202 are slave units.

[0032] With the goal of controlling the changes in load (water temperature) demand, the main unit 202 uniformly distributes the load. The main unit 202 can use the fuzzy control method to execute the addition and subtraction of the unit 202 to match the load demand, and cooperate with the switching action of the water shut-off valve 203 to realize the on-site variable water flow application of the chiller system 200 of this application.

[0033] The variable water flow application of the chiller system 200 of the present application can be used as an option. When the user selects the variable water flow application of the chiller system, the control of the variable water flow application will be enabled.

[0034] The water flow change of the refrigeration system 200 of the present application comes from the application end, and the water shut-off valve 203 in the cooling circulation loop does not participate in the flow change regulation of the application end, that is, the water shut-off valve 203 of the present application only has opening and closing actions, and no flow regulation action.

[0035] Figure 3 The schematic diagram of the structure of the refrigeration system 200 of another embodiment of the present application is disclosed. Figure 3 As shown, in another embodiment of the present application, the unified control system 201 can also be set up independently of the unit 202.

[0036] During the operation of the refrigeration system 200, the unified control system 201 of the present application can monitor the current number of open water shut-off valves 203 in real time, and can control the water shut-off valves 203 in the corresponding cooling circulation loop according to the minimum number of valve openings, thereby solving the reliability problem of the operation of the unit 202 of the refrigeration system 200 under small load and large flow.

[0037] In addition, the unified control system 201 of the present application can control the water shut-off valve 203 at two levels, and the two-level control has a priority level: the first level is loop-level control, that is, the units 202 in each cooling circulation loop match the load demand according to the control instructions of the refrigeration system 200, and control the opening and closing of the water shut-off valve 203 in the cooling circulation loop according to the start and stop status of the units 202 in the cooling circulation loop; the second level is unit-level control, that is, the number of openings of the water shut-off valve 203 in the cooling circulation loop is comprehensively controlled according to the minimum number of valve openings.

[0038] The unified control system 201 of the present application can perform two-level control on the water shut-off valve 203 at the unit level and the loop level, respectively giving corresponding control instructions to the water shut-off valve 203. However, the loop level control of the water shut-off valve 203 has a higher priority than the unit level control. The advantage of this is that it can ensure that the loop-level control and unit-level control of the water shut-off valve 203 are essentially not interfered with, and thus can ensure the consistency of software implementation with and without variable water flow control function (that is, the variable water flow application function is not enabled in the application configuration, the water shut-off valve 203 is configured at the loop level, and the action of the water shut-off valve 203 follows the loop-level control). Regardless of whether the chiller system 200 requires a variable water flow application, the same set of software algorithms can be used. The software can adapt to both variable water flow (that is, the water shut-off valve 203 is installed and configured for Auto control) and non-variable water flow (including two situations: 1. The water shut-off valve 203 is installed but configured for Manual control; 2. The water shut-off valve 203 is not installed) applications. It is only necessary to select whether to have this function in the application configuration.

[0039] The chiller system 200 of the present application adopts a unified control system 201 to comprehensively manage and control the units 202 and water shut-off valves 203 in multiple cooling circulation loops, and its structural layout is simple.

[0040] The present application also provides a control method for the refrigeration system 200 . Figure 4 The flowchart of the control method of the refrigeration system 200 according to one embodiment of the present application is disclosed. Figure 4 As shown, the control method of the refrigeration system 200 according to one embodiment of the present application may include steps S401 to S403.

[0041] In step S401, according to the load change requirements of the application end, a unified control system 201 comprehensively manages the units 202 of multiple cooling circulation loops to match the load change requirements, and controls the opening and closing of the water shut-off valve 203 in the corresponding cooling circulation loop according to the start and stop of the unit 202.

[0042] For example, the unified control system 201 can determine which units to start or stop based on the load change requirements of the application end. When the units are started up, they are started one by one. The principle of the unit startup order is determined based on the wear balance of the units. That is, the unit with the least running time is the first to be started. When the unified control system 201 controls the unit to shut down, the principle of the unit shutdown order is exactly the opposite of the principle of the unit startup order. That is, the unit with the longest running time is determined to be the first to be shut down.

[0043] In step S402, when the chiller system 200 is in operation, the unified control system 201 monitors in real time whether the number of water shut-off valves 203 currently open meets the minimum number of valve openings. If the number of water shut-off valves 203 currently open does not meet the minimum number of valve openings, the process proceeds to step S403. Otherwise, the process proceeds to step S14 without further processing.

[0044] In step S403 , when the minimum valve opening quantity is not met, the unified control system 201 controls the water cut-off valve 203 in the corresponding cooling circulation loop.

[0045] In some embodiments, when the minimum valve opening quantity is not met in step S403, the unified control system 201 controls the water shut-off valve 203 in the corresponding cooling circulation loop, which may further include steps S4031 and S4032.

[0046] In step S4031, when the number of currently opened water shut-off valves 203 is less than the minimum number of opened valves, the unified control system 201 controls the water shut-off valves 203 in the corresponding cooling circulation loop to open.

[0047] Optionally, the number of waterway shut-off valves 203 that need to be opened is controlled to be equal to the minimum valve opening number minus the current opening number of the waterway shut-off valves 203 .

[0048] In step S4032, when the number of open water shut-off valves 203 currently is greater than the minimum number of open valves, the unified control system 201 controls the water shut-off valves 203 in the corresponding cooling circulation loop to close.

[0049] Optionally, the number of waterway shut-off valves 203 that need to be closed is controlled to be equal to the number of currently opened waterway shut-off valves 203 minus the minimum number of opened valves.

[0050] In some embodiments, the water shut-off valve 203 of the present application can also be given additional functions. The water shut-off valve 203 can be in an available state or an unavailable state. When the water shut-off valve 203 is in automatic control, it is considered available, and accordingly, the cooling circuit in which it resides is also available. Consequently, the unified control system 201 can control the water shut-off valve 203 by switching it on and off, thereby participating in the control of the variable water flow and minimum valve opening number of the chiller system 200. When the water shut-off valve 203 is in manual control, powered off for maintenance, locked, or other states, it is defined as "unavailable" at the unit level, and accordingly, the cooling circuit in which it resides is also unavailable. A water shut-off valve 203 in the "unavailable" state no longer participates in the unified control system 201's statistical calculation of the current water shut-off valve 203's on-off state. This allows for on-site emergency response to unit maintenance and failures.

[0051] Therefore, in some embodiments, in step S4031, when the number of water shut-off valves 203 currently opened is less than the minimum number of valves opened, the unified control system 201 can sequentially select the water shut-off valves 203 in the corresponding cooling circulation loop where the compressor has the shortest running time from the cooling circulation loop where the water shut-off valves 203 that are currently in a closed state and are available are located to open.

[0052] For example, assume that chiller system 200 has six parallel-connected cooling loops and six chillers. If the minimum number of valves to be opened is two, and the current number of open water shutoff valves is one, and one more chiller needs to be opened, unified control system 201 can select, from the remaining five chillers, to open the water shutoff valve in the cooling loop with the shortest compressor run time.

[0053] In step S4032, when the number of water shut-off valves 203 currently opened is greater than the minimum number of valves opened, the unified control system 201 can select the water shut-off valves 203 in the corresponding cooling circulation loop where the compressor has been running the longest from the cooling circulation loop where the water shut-off valves 203 that are currently in an open and available state are located and close them.

[0054] For example, assume that chiller system 200 has six parallel-connected cooling loops and six chillers. If the minimum number of open valves is two, and the number of open water shutoff valves is currently four, two more chillers need to be closed. In this case, unified control system 201 can sequentially close the water shutoff valves in the two cooling loops with the longest and second-longest compressor run times from among the four open chillers.

[0055] In some embodiments, the control method of the refrigeration system 200 of the present application may further include step S411.

[0056] In step S411, when the chiller system 200 is started, that is, when any unit 202 in a cooling loop is started, the unified control system 201 controls the water shut-off valves 203 in all cooling loops to remain fully open, thereby facilitating the safe operation of the units 202.

[0057] In some embodiments, the control method of the refrigeration system 200 of the present application may further include step S412.

[0058] In step S412, when the chiller system 200 is shut down, that is, when all units 202 in the cooling loop are shut down, the unified control system 201 controls the water shut-off valves 203 in all cooling loops to remain fully open, thereby facilitating the safe operation of the units 202.

[0059] Figure 5 The present invention discloses a flow chart of controlling the water shut-off valve at the unit level according to an embodiment of the present invention. Figure 5As shown, in step S501, when the chiller system starts, the control of the water shut-off valve is started. Based on the load change requirements of the application end, the units in multiple parallel-connected cooling circuits are comprehensively managed, and the start and stop of the units are controlled to match the load change requirements. The water shut-off valves in each cooling circuit are opened and closed accordingly according to the start and stop of the units in the cooling circuit. Subsequently, the chiller system enters the operating state. After waiting for, for example, 15 minutes, in step S502, the number of water shut-off valves currently open is obtained. In step S503, it is determined whether the number of water shut-off valves currently open is greater than the minimum number of valves open. If the result of the judgment is "yes", the process proceeds to step S504. Otherwise, the process proceeds to step S505. In step S504, the number of water shut-off valves that need to be closed is calculated, where the number of water shut-off valves that need to be closed is equal to the number of water shut-off valves currently open minus the minimum number of valves open, and then the process proceeds to step S506. In step S505, the number of water shut-off valves that need to be opened is calculated, where the number of water shut-off valves that need to be opened is equal to the minimum number of valves opened minus the number of water shut-off valves currently open. The process then proceeds to step S507. In step S506, the required number of water shut-off valves are selected from the open and available water shut-off valves and closed. In step S507, the required number of water shut-off valves are selected from the closed and available water shut-off valves and opened. In step S508, a determination is made as to whether the chiller system is shut down. If the determination is "yes," the process proceeds to step S509. Otherwise, the process returns to step S502. When the chiller system is shut down, it enters a shutdown state. In step S509, when the chiller system enters a shutdown state, all available water shut-off valves are controlled to open. In step S510, a determination is made as to whether the chiller system is started. If the determination is "no," the process returns to step S509. When the judgment result is "yes", the process returns to step S501.

[0060] Figure 6 The present invention discloses a schematic diagram of a process for controlling the circuit level of a water shut-off valve according to an embodiment of the present invention. Figure 6 The control flow for the water shut-off valves in each cooling circuit enters step S600. After the cooling system starts, the system waits for one second to determine whether the cooling circuit is locked, powered off, or in a manual control priority state. If so, the system enters manual control of the water shut-off valves. Otherwise, the system enters automatic control of the water shut-off valves.

[0061] Figure 6 The upper part is the variable water flow control (ie Auto control), that is, the automatic control of the water cut-off valve. Figure 6As shown, in step S601, it is checked whether the cooling circulation loop is of a non-variable water flow control type. When the result of the judgment is "yes", the process proceeds to step S602. Otherwise, the process proceeds to step S603. In step S602, the water shut-off valve in the cooling circulation loop is controlled to be opened. In step S603, if the cooling circulation loop is of a variable water flow control type, it is considered that the water shut-off valve in the cooling circulation loop can be used for variable water flow control. In step S604, it is determined whether the cooling circulation loop is selected to be opened. In step S605, if the unit in the cooling circulation loop is turned on, it is considered that the cooling circulation loop is selected to be opened. At this time, the water shut-off valve in the cooling circulation loop is opened. After waiting for the maximum operating time of the water shut-off valve, the process proceeds to step S606. In step S606, the water shut-off valve is opened. In step S607, it is determined whether the cooling circulation loop is selected to be closed. When a unit in the cooling loop is shut down, the cooling loop is considered closed. If the cooling loop is closed, the process proceeds to step S604. If the cooling loop is not closed, the process proceeds to step S606. If the cooling loop is not open, the process proceeds to step S608. In step S608, the water shut-off valve is closed. In step S609, it is determined whether the unit-level water shut-off valve opening is required. If the total number of currently open water shut-off valves in the chiller system is less than the minimum number of open valves, and the water shut-off valves in the cooling loop meet the valve opening sequence requirements, the unit-level water shut-off valve opening is required. If the unit-level water shut-off valve opening is required, the process proceeds to step S610. Otherwise, the process returns to step S609 and continues the determination. In step S610, the water shut-off valve is opened. After waiting for the maximum operating time of the water shut-off valve, the process proceeds to step S611. In step S611, the water shut-off valve is opened. In step S612, a determination is made as to whether the unit-level water shut-off valves require closure. If the total number of currently open water shut-off valves in the chiller system exceeds the minimum number of open valves, and the water shut-off valves in the cooling circuit meet the valve closing sequence requirements, the unit-level water shut-off valves in the cooling circuit are required to be opened. If the unit-level water shut-off valves require closure, the process proceeds to step S608. Otherwise, the process continues to step S611.

[0062] Figure 6 The lower part is for manual control. Figure 6As shown, in step S613, it is determined whether the cooling cycle loop is manually controlled first. If the result of the determination is "yes", the process proceeds to step S614. Otherwise, the process returns to step S613 to continue determination. In step S614, the water shut-off valve in the cooling cycle loop is closed. In step S615, it is determined whether a manual opening command is received. If the determination is "yes", the process proceeds to step S616 to open the water shut-off valve. Otherwise, the process returns to step S615 to continue determination. In step S617, it is determined whether a manual closing command is received. If the determination is "yes", the process proceeds to step S614. Otherwise, the process returns to step S616 to continue determination.

[0063] The present application also provides a control device 700 for a refrigeration system. Figure 7 A schematic block diagram of a control device 700 for a refrigeration system according to an embodiment of the present application is disclosed. Figure 7 As shown, the control device 700 of the refrigeration system of one embodiment of the present application includes a processor 701, an internal bus 702, a network interface 703, a memory 704 and a non-volatile memory 705, and of course may also include hardware required for other services. The processor 701 can read the corresponding computer program from the non-volatile memory 705 into the memory 704 and then run it to implement the steps of the control method of the refrigeration system as described above. Of course, in addition to software implementation, this application does not exclude other implementation methods, such as logic devices or a combination of software and hardware, etc., that is, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic components.

[0064] The refrigeration system and its control method and control device of the present application can solve the reliability problem of the unit operation in a small load and large flow scenario.

[0065] The control method, control device and refrigeration system of the refrigeration system provided in the embodiment of the present application are introduced in detail above. Specific examples are used herein to illustrate the control method, control system and refrigeration system of the refrigeration system of the embodiment of the present application. The description of the above embodiments is only used to help understand the core idea of the present application and is not intended to limit the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the spirit and principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications should also fall within the scope of protection of the claims attached to the present application.

Claims

1. A control method for a chiller system, wherein the chiller system comprises a plurality of cooling circuits connected in parallel, each cooling circuit comprising a unit and a water shut-off valve, characterized in that: The control method includes: According to the load change requirements of the application end, a unified control system is used to coordinate and manage the units of multiple cooling circulation loops to match the load change requirements, and control the opening and closing of the water shut-off valves in the corresponding cooling circulation loops according to the start and stop of the units; When the refrigeration system is in operation, the unified control system monitors in real time whether the number of open water shut-off valves of the current refrigeration system meets the minimum number of open valves; When the minimum number of valve openings is not met, the unified control system controls the water cut-off valves in the corresponding cooling circulation loop.

2. The control method according to claim 1, wherein: When the minimum number of valve openings is not met, the unified control system controls the water cut-off valve in the corresponding cooling circulation loop, including: When the number of currently opened water shut-off valves is less than the minimum number of opened valves, the unified control system controls the water shut-off valves in the corresponding cooling circulation loop to open; When the number of the currently opened water shut-off valves is greater than the minimum number of opened valves, the unified control system controls the water shut-off valves in the corresponding cooling circulation loop to close.

3. The control method according to claim 2, wherein: When the number of the currently opened water cut-off valves is less than the minimum number of opened valves, the unified control system controls the water cut-off valves in the corresponding cooling circulation loop to open, including: When the number of currently opened water shut-off valves is less than the minimum number of opened valves, the unified control system sequentially selects, from among the cooling circuits where the currently closed and available water shut-off valves are located, the water shut-off valves in the corresponding cooling circuits with the shortest compressor operation time to be opened; When the number of the currently opened water cut-off valves is greater than the minimum number of opened valves, the unified control system controls the water cut-off valves in the corresponding cooling circulation loop to close, including: When the current number of open water shut-off valves is greater than the minimum number of open valves, the unified control system selects the water shut-off valves in the corresponding cooling circulation loop where the compressor has been running the longest from the cooling circulation loop where the water shut-off valves that are currently in an open and available state are located to be closed.

4. The control method according to claim 3, wherein: Also includes: When the water shut-off valve is in an unavailable state, the water shut-off valve in the unavailable state does not participate in the statistical calculation of the current on / off state of the water shut-off valve.

5. The control method according to claim 2, wherein: Control the number of waterway shut-off valves that need to be opened to be equal to the minimum valve opening number minus the current number of waterway shut-off valves opened; The number of waterway shut-off valves that need to be closed is controlled to be equal to the number of waterway shut-off valves that are currently open minus the minimum number of valves that are open.

6. The control method according to claim 1, wherein: Also includes: When any unit in the cooling circulation loop is started, the unified control system controls the water shut-off valves in all cooling circulation loops to remain in a fully open state.

7. The control method according to claim 1, wherein: Also includes: When all the units in the cooling circulation loops are shut down, the unified control system controls the water shut-off valves in all the cooling circulation loops to remain in a fully open state.

8. A control device for a refrigeration system, comprising a memory, a processor, and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method for controlling a refrigeration system according to any one of claims 1 to 7.

9. A cooling system, characterized in that: It includes a unified control system and multiple cooling circulation loops connected in parallel. Each cooling circulation loop includes a unit and a water shut-off valve, wherein: The unified control system is used to coordinate the management of multiple units of the cooling circulation loop according to the load demand changes at the application end to match the load change requirements, and control the opening and closing of the water shut-off valves in the corresponding cooling circulation loop according to the start and stop of the units; and when the refrigeration system is in operation, it monitors in real time whether the number of open water shut-off valves currently meeting the minimum number of open valves, and controls the water shut-off valves in the corresponding cooling circulation loop when the minimum number of open valves is not met.

10. The refrigeration system according to claim 9, wherein: The unified control system is arranged in one of the units.

11. The refrigeration system according to claim 9, wherein: The units and water shut-off valves in the plurality of cooling circulation loops are communicatively connected to the unified control system via the Modbus communication protocol.

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