Cold distribution unit group control liquid cooling system and control method thereof

Abstract

The invention discloses a cold distribution unit group control liquid cooling system and a control method thereof, and relates to the technical field of refrigeration, the liquid cooling system comprises a refrigeration device, a plurality of cold distribution units, a switch and a management system; each cold distribution unit comprises a circulating water pump, a pipeline system and a heat dissipation tail end; the switch is respectively in communication connection with the controller and the management system in each cold distribution unit; and the controller in each cold distribution unit is in communication connection with the controllers in the other two cold distribution units, so that each cold distribution unit forms a ring network communication structure. According to the liquid cooling system, protection of bilateral redundant links can be realized based on communication among the cooling distribution units under a ring network communication structure, and when a certain single-point link is interrupted, normal communication and operation of the whole liquid cooling system are not influenced, so that the stability is improved; in addition, each cold distribution unit is flexibly controlled by configuring a single machine mode and a group control mode, so that the working flexibility of the liquid cooling system is improved.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and particularly to a group control liquid cooling system for cold distribution units and its control method. Background Art

[0002] With the continuous development of digitalization, the scale of data centers is also constantly changing, and the heat generated by them needs to be cooled in a timely manner to ensure their normal operation. At this time, a Cold Distribution Unit (CDU) can be used for liquid cooling. The CDU can achieve efficient and accurate liquid cooling in rack-level data centers.

[0003] However, the existing technologies have the following disadvantages: the group control communication architecture is not stable enough (under the traditional serial bus, a fault at an intermediate point will cause normal communication of subsequent links), the protection measures under abnormal working conditions are insufficient, and the selection of working modes is not flexible enough. Summary of the Invention

[0004] The main purpose of the embodiments of this application is to propose a group control liquid cooling system for cold distribution units and its control method to improve the stability and flexibility of the liquid cooling system.

[0005] To achieve the above object, on the one hand, an embodiment of this application proposes a group control liquid cooling system for cold distribution units, and the liquid cooling system includes: a refrigeration device, multiple cold distribution units, a switch, and a management system;

[0006] Wherein, each of the cold distribution units includes a circulating water pump, a pipeline system, and a heat dissipation terminal;

[0007] The refrigeration device is used to provide a cooling medium;

[0008] The circulating water pump is used to transport the cooling medium through the pipeline system to the heat dissipation terminal;

[0009] The heat dissipation terminal is used to enable the cooling medium to exchange heat with the equipment to be cooled;

[0010] The controllers in each of the cold distribution units are respectively communicatively connected to the switch, and the switch is also communicatively connected to the management system;

[0011] The controllers in each of the cold distribution units are respectively communicatively connected to the controllers in the other two cold distribution units to form a ring network communication structure for each of the cold distribution units;

[0012] The controllers in each of the cold distribution units are also respectively communicatively connected to a human-machine interaction device.

[0013] In some embodiments, the liquid cooling system further includes an expansion tank pressure stabilizing system, and the expansion tank pressure stabilizing system is configured to absorb the cooling medium so that the liquid cooling system is maintained at a set pressure.

[0014] In some embodiments, the liquid cooling system further includes an automatic constant pressure water supply system, and the automatic constant pressure water supply system is configured to supply water to the liquid cooling system so that the liquid cooling system is maintained at a set pressure.

[0015] To achieve the above object, on the other hand, an embodiment of the present application provides a control method for a cold distribution unit group-controlled liquid cooling system. The control method is used to control a cold distribution unit group-controlled liquid cooling system as described in the present application, and the method includes the following steps:

[0016] Determine whether each cold distribution unit in the liquid cooling system adopts a single machine mode or a group control mode;

[0017] If it is determined that each cold distribution unit adopts the group control mode, then arbitrarily select one of the cold distribution units as the host, and the remaining cold distribution units as slaves; the host and each slave operate according to the first target parameters set by the host;

[0018] If it is determined that each cold distribution unit adopts the single machine mode, then each cold distribution unit operates according to its own set second target parameters.

[0019] In some embodiments, when each cold distribution unit adopts the group control mode, the method further includes the following steps:

[0020] When the main circulation pump in each cold distribution unit reaches the machine addition frequency and continues for a set first delay time, and the flow rate or pressure difference of the liquid cooling system still does not reach the first target value, several cold distribution units are added to operate;

[0021] When the main circulation pump in each cold distribution unit reaches the machine reduction frequency and continues for a set second delay time, and the flow rate or pressure difference of the liquid cooling system still exceeds the second target value, several cold distribution units are reduced to operate;

[0022] When the number of each cold distribution unit is reduced to the minimum machine reduction number, and the main circulation pump in each cold distribution unit drops to the machine reduction frequency and continues for a set third delay time, and the flow rate or pressure difference of the liquid cooling system still exceeds the third target value, then the bypass valve is opened for shunting.

[0023] In some embodiments, when each cold distribution unit adopts the group control mode, the method further includes the following steps:

[0024] When the main pump is in hot standby, control two main circulation pumps in each of the cold distribution units to operate simultaneously;

[0025] When the main pump is in cold standby, control one main circulation pump in each of the cold distribution units to operate and the other main circulation pump to be in standby;

[0026] When the main pump fails, the main pump is switched, or the main pump switching cycle is reached, switch each of the cold distribution units to operate with the standby pump and stop the main pump.

[0027] In some embodiments, the method further includes the following steps:

[0028] Adjust the opening degree of the regulating valve on the primary side of the liquid cooling system to adjust the flow rate of the cooling medium on the primary side, so that the difference between the liquid supply temperature on the secondary side of the liquid cooling system and the first target temperature value is less than a preset threshold.

[0029] In some embodiments, the method further includes the following steps:

[0030] Adjust the opening degree of the regulating valve on the primary side of the liquid cooling system to adjust the flow rate of the cooling medium on the primary side, so that the difference between the liquid supply temperature on the secondary side of the liquid cooling system and the second target temperature value is within a fixed numerical range.

[0031] In some embodiments, the method further includes the following steps:

[0032] When the liquid supply pressure on the secondary side of the liquid cooling system is lower than the set start-up water replenishment pressure, first open the water replenishment valve and then start the water replenishment pump;

[0033] When the duration of the water replenishment process reaches the set water replenishment failure delay, generate an alarm message for water replenishment failure and send the alarm message to the operation and maintenance personnel;

[0034] When the liquid supply pressure on the secondary side exceeds the set stop water replenishment pressure, first turn off the water replenishment pump and then close the water replenishment valve.

[0035] In some embodiments, the method further includes the following steps:

[0036] Calculate the heat exchange power according to the specific heat capacity, the liquid supply flow rate on the secondary side of the liquid cooling system, and the temperature difference between the supply and return liquids on the secondary side;

[0037] Control each of the cold distribution units in the liquid cooling system according to the heat exchange power.

[0038] The embodiments of the present application at least include the following beneficial effects:

[0039] This application is based on the communication between each cold distribution unit under the ring network communication structure, and can achieve the protection of bilateral redundant links. When a single-point link is interrupted, it will not affect the normal communication and operation of the overall liquid cooling system, improving the stability. In addition, this application flexibly controls each cold distribution unit by configuring the single-machine mode and the group control mode, improving the working flexibility of the liquid cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is a schematic flowchart of a control method for a group-controlled liquid cooling system of cold distribution units provided by an embodiment of the present application;

[0042] Figure 2 It is an example structure diagram of a group-controlled liquid cooling system of cold distribution units provided by an embodiment of the present application;

[0043] Figure 3 It is a specific structure diagram of a liquid cooling system provided by an embodiment of the present application;

[0044] Figure 4 It is an operation set value setting interface diagram of a liquid cooling system provided by an embodiment of the present application;

[0045] Figure 5 It is another operation set value setting interface diagram of a liquid cooling system provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] In order to make the purpose, technical solutions and advantages of the present application more clear and understandable, the following further details the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. When the following description involves the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the embodiments of the present application. They are only examples of devices and methods consistent with some aspects of the embodiments of the present application described in detail in the appended claims.

[0047] It can be understood that the terms "first", "second", etc. used in this application may be used herein to describe various concepts, but unless otherwise specified, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if", "when" as used herein may be interpreted as "when...", "while...", or "in response to determining".

[0048] The terms "at least one", "a plurality of", "each", "any one", etc. used in this application, at least one includes one, two, or more than two, a plurality of includes two or more than two, each refers to each one of the corresponding plurality, and any one refers to any one of the plurality.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0050] Before elaborating on the embodiments of this application in detail, some nouns and terms involved in the embodiments of this application are first explained. The nouns and terms involved in the embodiments of this application are applicable to the following explanations:

[0051] CDU: Cold Distribution Unit, cold distribution unit.

[0052] PLC: Programmable Logic Controller, programmable logic controller.

[0053] HMI: Human Machine Interface, human-machine interface.

[0054] PID: Proportion Integration Differentiation, proportional-integral-derivative control.

[0055] POD: Point of Delivery, delivery point.

[0056] The existing CDU liquid cooling system generally consists of cooling equipment (such as a chiller), a circulating water pump, a pipeline system, a CDU heat dissipation end, etc. The chiller produces cold water through the evaporation and condensation cycle of the refrigeration machine. The circulating water pump drives the cold water to flow in the pipeline and transports the cold water to the CDU heat dissipation end. At the heat dissipation end, the cold water absorbs heat and warms up, and then returns to the chiller for cooling. This cycle repeats to take away the heat generated by equipment such as servers to ensure that the equipment operates within an appropriate temperature range.

[0057] The existing technology mainly has the following disadvantages: the group control communication architecture is not stable enough (under the traditional serial bus, a fault at an intermediate point will cause normal communication of subsequent links), the protection measures under abnormal working conditions are insufficient (such as fault machine shutdown, mode conversion, etc.), and the selection of working modes is not flexible enough (several units in use and several in standby for CDU units). In response to the above aspects, the technical solution of this application optimizes the overall communication topology architecture, adds a series of protection measures for abnormal scenarios, and improves the selection mechanism of various working modes and their flexible switching with each other.

[0058] The embodiment of this application provides a group control liquid cooling system for a cold distribution unit. The liquid cooling system includes: a refrigeration device, multiple cold distribution units, a switch, and a management system;

[0059] Among them, each cold distribution unit includes a circulating water pump, a pipeline system, and a heat dissipation end;

[0060] The refrigeration device is used to provide a cooling medium;

[0061] The circulating water pump is used to transport the cooling medium to the heat dissipation end through the pipeline system;

[0062] The heat dissipation end is used to enable the cooling medium to exchange heat with the equipment to be cooled;

[0063] The controllers in each cold distribution unit are respectively communicatively connected to the switch, and the switch is also communicatively connected to the management system;

[0064] The controllers in each cold distribution unit are respectively communicatively connected to the controllers in the other two cold distribution units to form a ring network communication structure for each cold distribution unit;

[0065] The controllers in each cold distribution unit are also respectively communicatively connected to a human-machine interaction device.

[0066] Further, the liquid cooling system further includes an expansion tank pressure stabilizing system, and the expansion tank pressure stabilizing system is used to absorb the cooling medium to keep the liquid cooling system at a set pressure.

[0067] Further, the liquid cooling system further includes an automatic constant pressure water supply system, which is used to supply water to the liquid cooling system to maintain the liquid cooling system at a set pressure.

[0068] Referring to Figure 1 , an embodiment of the present application also provides a control method for a cold distribution unit group-controlled liquid cooling system, which is used to control a cold distribution unit group-controlled liquid cooling system according to the embodiment of the present application. The method includes the following steps S100 to S120:

[0069] S100: Determine whether each cold distribution unit in the liquid cooling system adopts a single machine mode or a group control mode;

[0070] S110: If it is determined that each cold distribution unit adopts the group control mode, then arbitrarily select one of the cold distribution units as the host, and the remaining cold distribution units as slaves; the host and each slave operate according to the first target parameters set by the host;

[0071] S120: If it is determined that each cold distribution unit adopts the single machine mode, then each cold distribution unit operates according to its own set second target parameters.

[0072] Further, when each cold distribution unit adopts the group control mode, the method further includes the following steps:

[0073] When the main circulation pumps in each cold distribution unit reach the machine addition frequency and continue for a set first delay time, and the flow rate or pressure difference of the liquid cooling system still does not reach the first target value, several cold distribution units are added to operate;

[0074] When the main circulation pumps in each cold distribution unit reach the machine subtraction frequency and continue for a set second delay time, and the flow rate or pressure difference of the liquid cooling system still exceeds the second target value, several cold distribution units in operation are reduced;

[0075] When the number of each cold distribution unit is reduced to the minimum machine subtraction number, and the main circulation pumps in each cold distribution unit drop to the machine subtraction frequency and continue for a set third delay time, and the flow rate or pressure difference of the liquid cooling system still exceeds the third target value, then the bypass valve is opened for diversion.

[0076] As another further optional implementation manner, when each cold distribution unit adopts the group control mode, the method further includes the following steps:

[0077] When the main pump is in hot standby, control two main circulation pumps in each cold distribution unit to work simultaneously;

[0078] When the main pump is in cold standby, control one of the main circulation pumps in each of the cold distribution units to run, and the other main circulation pump is in standby;

[0079] When the main pump fails, the main pump is switched, or the main pump switching cycle is reached, switch each of the cold distribution units to the standby pump to run, and stop the main pump from running.

[0080] As a further optional implementation manner, the method further includes the following steps:

[0081] Adjust the opening degree of the regulating valve on the primary side of the liquid cooling system to adjust the flow rate of the cooling medium on the primary side, so that the difference between the liquid supply temperature on the secondary side of the liquid cooling system and the first target temperature value is less than a preset threshold.

[0082] As a further optional implementation manner, the method further includes the following steps:

[0083] Adjust the opening degree of the regulating valve on the primary side of the liquid cooling system to adjust the flow rate of the cooling medium on the primary side, so that the difference between the liquid supply temperature on the secondary side of the liquid cooling system and the second target temperature value is within a fixed numerical range.

[0084] As a further optional implementation manner, the method further includes the following steps:

[0085] When the liquid supply pressure on the secondary side of the liquid cooling system is lower than the set start-up water replenishment pressure, first open the water replenishment valve, and then start the water replenishment pump;

[0086] When the duration of the water replenishment process reaches the set water replenishment failure delay, generate an alarm message for water replenishment failure and send the alarm message to the operation and maintenance personnel;

[0087] When the liquid supply pressure on the secondary side exceeds the set stop water replenishment pressure, first turn off the water replenishment pump, and then turn off the water replenishment valve.

[0088] As a further optional implementation manner, the method further includes the following steps:

[0089] Calculate the heat exchange power according to the specific heat capacity, the liquid supply flow rate on the secondary side of the liquid cooling system, and the temperature difference between the supply and return liquids on the secondary side;

[0090] Control each of the cold distribution units in the liquid cooling system according to the heat exchange power.

[0091] Next, the solution of the embodiment of the present application will be introduced and described in detail in combination with specific application examples.

[0092] Refer to Figure 2 , this embodiment provides an example structure diagram of a cold distribution unit group control liquid cooling system.

[0093] Exemplarily, Siemens 1215PLC is used as the controller in each CDU, and at the same time, a Weilin Tong CMT2079X touch screen is configured as the human-machine interaction device. The controller communicates with the touch screen through a serial port, and for the group control communication between CDUs, a ring network communication structure is formed through the dual network ports built in the 1215PLC. Under this ring network communication structure, even if the network of a certain single point in the middle is interrupted, it will not affect the normal operation of the system.

[0094] Specifically, the specific structure diagram of the liquid cooling system in this embodiment is as Figure 3 shown. The cooling medium is boosted by the main circulation pump and then passes through the plate heat exchanger, where it exchanges heat with the external cold source on the other side in the plate heat exchanger, and then enters the server to be cooled after being cooled, taking out the heat and then returning to the main circulation pump for a closed reciprocating cycle, which can effectively control the stability of the temperature of the cooling medium entering the server. Devices such as filters are connected in series in the system, which can effectively control the impurities entering the server to be cooled. At the same time, the circulation management also has an expansion tank pressure stabilizing system to maintain constant pressure for the system and absorb the volume change of the cooling medium in the system, and an automatic constant pressure makeup water system is also provided to ensure the normal operation of the entire system.

[0095] Furthermore, the operation set value setting interface of the liquid cooling system in this embodiment is as Figure 4 shown.

[0096] Group control setting: Each CDU can be set to single machine mode or group control mode respectively. In single machine mode, the CDU operates alone according to the set target parameters; in group control mode, there is only one host, and each CDU operates according to the target parameters set by the host. There are 4 working modes in group control mode: 1 in use and 2 in standby, 2 in use and 1 in standby, 3 in use and 0 in standby, automatic addition and subtraction of machines.

[0097] Addition and subtraction of machines setting: When the main circulation pump reaches the addition machine frequency and continues for the set delay time, and the flow rate / differential pressure still does not reach the target value, the system automatically adds 1 CDU to run; when the main circulation pump drops to the subtraction machine frequency and continues for the set delay time, and the flow rate / differential pressure still exceeds the target value, the system automatically reduces 1 CDU to run; the minimum subtraction machine quantity limits the minimum number of CDUs running in the automatic addition and subtraction of machines mode. When the minimum subtraction machine quantity is reached, and the main circulation pump drops to the subtraction machine frequency and continues for the set delay time, and the flow rate / differential pressure still exceeds the target value, the bypass valve is opened for diversion.

[0098] Main pump setting: In the case of main pump hot standby, 2 main circulation pumps in the CDU work simultaneously; in the case of main pump cold standby, 1 main circulation pump in the CDU runs and 1 main circulation pump is in standby. When the running pump fails, or the main pump is manually switched, or the main pump switching cycle is reached, the CDU automatically switches to the standby pump and stops the original running pump.

[0099] The operating set value setting interface of another liquid cooling system is as Figure 5 shown.

[0100] The operating set value of the primary side regulating valve V304: The regulating valve automatically adjusts the opening according to the PID algorithm based on the set secondary side liquid supply temperature target value to control the flow rate of the primary side coolant, so that the secondary side liquid supply temperature is stabilized near the target value. When the secondary side liquid supply temperature approaches the dew point, the system automatically raises the liquid supply temperature target value according to the set value, thereby reducing the opening of the primary side regulating valve, reducing the flow rate of the primary side coolant, and effectively avoiding condensation.

[0101] The temperature difference mode of the primary and secondary side liquid supply: When this mode is enabled, the secondary side liquid supply temperature will use the primary side liquid supply temperature + the set temperature difference value as the actual target value to control the primary side regulating valve, so as to achieve stable control of the temperature difference between the primary and secondary sides.

[0102] The operating set value of the make-up water pump P11: When the secondary side liquid supply pressure is lower than the set start make-up water pressure, the system automatically starts to make up water (pump-valve linkage: first open the pump, then the make-up water valve, and then the make-up water pump to avoid being impacted when the make-up water valve is not fully opened after starting the pump). When the make-up water process duration reaches the set make-up water failure delay time, the system generates an alarm message for make-up water failure to remind the operation and maintenance personnel to check whether there are abnormalities in the system pipeline and equipment; when the secondary side liquid supply pressure exceeds the set stop make-up water pressure, the system automatically stops making up water (pump-valve linkage: first close the pump, and then the make-up water valve after the pump).

[0103] Heat transfer power parameter setting: Considering the specific heat capacity differences of different cooling media, when calculating the heat transfer power of the system, the set value of the specific heat capacity is opened, and the system calculates the heat transfer power based on the specific heat capacity, the secondary side liquid supply flow rate, and the secondary side liquid supply and return temperature difference.

[0104] In summary, this embodiment can perform overall control on the primary and secondary side pipeline equipment in each group-controlled CDU based on the actual flow rate, temperature, pressure difference and other data fed back by the secondary side pipeline, so as to achieve an efficiently controlled liquid cooling system. Ethernet communication is carried out between each CDU through a ring network dual-link to ensure normal communication between each CDU even when a single-point connection is interrupted. In the group control mode, according to the target flow rate / pressure difference value set by the host, PID precise adjustment is performed on the main circulation pump, the secondary side bypass valve, and the primary side regulating valve to ensure that the system operates stably at the target value. In addition, this embodiment sets a large number of abnormal shutdown scenarios, such as main circulation pump failure, main circulation pump start failure, system emergency stop, super-high liquid supply temperature, all liquid supply temperature failures, abnormal hydraulic conditions (that is, ultra-low secondary side liquid supply flow rate and low pump head), primary side regulating valve out-of-tolerance, etc., to ensure that when an abnormal situation occurs in a certain CDU and it cannot meet the normal liquid cooling requirements, the operation is switched to the standby CDU in time.

[0105] The beneficial effects of this embodiment include:

[0106] Through the Ethernet communication between each CDU under the ring network communication structure in this embodiment, the protection of bilateral redundant links is obtained. When a single-point link is interrupted, it will not affect the normal communication and operation of the overall system. At the same time, the system will also display an alarm message for ring network interruption to remind the operation and maintenance personnel to check the network link in time. In addition, this embodiment configures shutdown and unit tripping logics for various scenarios where normal liquid cooling requirements cannot be met, and cooperates with various working modes such as 1 in use and 2 in standby, 2 in use and 1 in standby, 3 in use and 0 in standby, and automatic unit addition and subtraction to flexibly call each CDU to meet the liquid cooling requirements under different working conditions.

[0107] The embodiments described in the embodiments of this application are for more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. Those skilled in the art know that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are equally applicable to similar technical problems.

[0108] Those skilled in the art can understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than those shown in the figures, or combine some steps, or different steps.

[0109] Those of ordinary skill in the art can understand that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, and their appropriate combinations.

[0110] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of this application and the above figures are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order different from those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0111] It should be understood that in this application, "at least one (item)" means one or more, and "a plurality" means two or more. "And / or" is used to describe the relationship between associated objects and indicates that there can be three relationships. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist simultaneously. Here, A and B can be singular or plural. The character " / " generally indicates an "or" relationship between the associated objects before and after. "At least one (item) of the following" or a similar expression means any combination of these items, including any combination of single items or plural items. For example, at least one (item) of a, b, or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0112] The preferred embodiments of the embodiments of the present application have been described above with reference to the accompanying drawings. However, this does not limit the scope of the rights of the embodiments of the present application. Any modification, equivalent replacement, and improvement made by those skilled in the art without departing from the scope and essence of the embodiments of the present application shall be within the scope of the rights of the embodiments of the present application.

Claims

1. A cold distribution unit group control liquid cooling system, characterized in that: The liquid cooling system includes: refrigeration equipment, multiple cold distribution units, switches and management systems; Wherein, each of the cold distribution units comprises a circulating water pump, a piping system and a heat dissipation terminal; The refrigeration equipment is used to provide a cooling medium; The circulating water pump is used to transport the cooling medium to the heat dissipation end through the pipeline system; The heat dissipation terminal is used to allow the cooling medium to exchange heat with the device to be cooled; The controllers in each of the cold distribution units respectively establish communication connections with the switches, and the switches also establish communication connections with the management system; The controller in each of the cold distribution units establishes a communication connection with the controllers in the other two cold distribution units, so that each of the cold distribution units forms a ring network communication structure; The controller in each of the cold distribution units also establishes a communication connection with a human-computer interaction device.

2. A cold distribution unit group control liquid cooling system according to claim 1, characterized in that: The liquid cooling system further comprises an expansion tank pressure stabilizing system, wherein the expansion tank pressure stabilizing system is used to absorb the cooling medium so as to maintain the liquid cooling system at a set pressure.

3. The cold distribution unit group control liquid cooling system according to claim 1, characterized in that: The liquid cooling system further comprises an automatic constant pressure water replenishment system, and the automatic constant pressure water replenishment system is used to supply water to the liquid cooling system so as to maintain the liquid cooling system at a set pressure.

4. A control method for a cold distribution unit group controlled liquid cooling system, characterized in that: The control method is used to control a cold distribution unit group control liquid cooling system according to claim 1, and the method comprises the following steps: Determine whether each cooling distribution unit in the liquid cooling system adopts a stand-alone mode or a group control mode; If it is true that each of the cold distribution units adopts the group control mode, one of the cold distribution units is randomly selected as a master unit, and the other cold distribution units are selected as slave units; the master unit and the slave units operate according to the first target parameter set by the master unit; If each of the cold distribution units indeed adopts the stand-alone mode, each of the cold distribution units will operate according to its own set second target parameter.

5. The control method of a cold distribution unit group controlled liquid cooling system according to claim 4, characterized in that: When each of the cold distribution units adopts the group control mode, the method further includes the following steps: When the main circulating water pump in each of the cold distribution units reaches the frequency of adding a machine and continues for the set first delay time, if the flow rate or pressure difference of the liquid cooling system still does not reach the first target value, add a number of the cold distribution units to operate; When the main circulating water pump in each of the cold distribution units reaches the frequency of reduction and lasts for the set second delay time, and the flow rate or pressure difference of the liquid cooling system still exceeds the second target value, reducing the number of cold distribution units to be operated; When the number of the cold distribution units is reduced to the minimum number of reduced machines, and the main circulation water pump in each of the cold distribution units drops to the reduced machine frequency and continues for the set third delay time, if the flow or pressure difference of the liquid cooling system still exceeds the third target value, the bypass valve is opened for diversion.

6. The control method of a cold distribution unit group controlled liquid cooling system according to claim 4, characterized in that: When each of the cold distribution units adopts the group control mode, the method further includes the following steps: When the main pump is in hot standby mode, the two main circulation pumps in each cold distribution unit are controlled to work simultaneously; When the main pump is in cold standby mode, one main circulation pump in each cold distribution unit is controlled to operate, and the other main circulation pump is in standby mode; When the main pump fails, is switched, or reaches the main pump switching cycle, each of the cold distribution units is switched to the standby pump and the main pump is stopped.

7. The control method of a cold distribution unit group controlled liquid cooling system according to claim 4, characterized in that: The method further comprises the following steps: The opening of the regulating valve on the primary side of the liquid cooling system is adjusted to adjust the flow rate of the cooling medium on the primary side, thereby making the difference between the liquid supply temperature on the secondary side of the liquid cooling system and the first target temperature value smaller than a preset threshold.

8. The control method of a cold distribution unit group controlled liquid cooling system according to claim 4, characterized in that: The method further comprises the following steps: The opening of the regulating valve on the primary side of the liquid cooling system is adjusted to adjust the flow rate of the cooling medium on the primary side, thereby making the difference between the liquid supply temperature on the secondary side of the liquid cooling system and the second target temperature value within a fixed numerical range.

9. The control method of a cold distribution unit group controlled liquid cooling system according to claim 4, characterized in that: The method further comprises the following steps: When the liquid supply pressure on the secondary side of the liquid cooling system is lower than the set starting water supply pressure, the water supply valve is opened first, and then the water supply pump is opened; When the duration of the water replenishment process reaches the set water replenishment failure delay, a water replenishment failure alarm message is generated and sent to the operation and maintenance personnel; When the liquid supply pressure on the secondary side exceeds the set water replenishment stop pressure, the water replenishment pump is turned off first, and then the water replenishment valve is closed.

10. The control method of a cold distribution unit group controlled liquid cooling system according to claim 4, characterized in that: The method further comprises the following steps: The heat exchange power is calculated based on the specific heat capacity, the liquid supply flow rate on the secondary side of the liquid cooling system, and the supply and return liquid temperature difference on the secondary side; Each of the cold distribution units in the liquid cooling system is controlled according to the heat exchange power.

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