CDU unit group control machine group control machine group control method and CDU unit system

Abstract

The application provides a CDU unit group control method and a CDU unit system. After judging the number of current working CDUs and determining the working CDU to be stopped, the method adjusts the action rate and action condition of each key component respectively when the number of current working CDUs is one or more. The method can not only avoid the influence of directly starting each component of the standby CDU and directly closing each component of the working CDU to be stopped on the stability of the whole CDU unit system, but also can adaptively adopt a relatively fast or relatively slow operation rate according to different situations, realize targeted efficient or smooth machine cutting, reduce the hydraulic or thermal fluctuation of the system during machine cutting, improve the reliability and stability of the system, and maintain the heat dissipation of the data center.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid cooling systems, and particularly relates to a CDU unit group control machine cutting control method and a CDU unit system. BACKGROUND

[0002] A data center usually configures multiple cooling distribution units (CDUs) to meet the refrigeration needs of a large number of high-power servers inside, and in order to guarantee the reliability of liquid cooling, a redundant CDU is configured as a backup. The multiple CDUs and the backup CDU constitute a CDU unit system.

[0003] In the related art, when the CDU (a working CDU to be disabled) in use and the backup CDU are controlled and switched on and off due to a fault or a non-fault, etc., the unit parameters of the backup CDU are usually directly set to be consistent with the unit parameters of the working CDU to be disabled, and the working CDU to be disabled is quickly turned off. However, the above machine cutting method will have a huge impact on the entire CDU unit system, causing a sharp fluctuation of the hydraulic or thermal force of the system, reducing the reliability and stability of the system, and further affecting the heat dissipation of the data center. SUMMARY

[0004] Therefore, the embodiments of the present application provide a CDU unit group control machine cutting control method and a CDU unit system to solve the technical problem that the related machine cutting method will have a huge impact on the entire CDU unit system, reduce the reliability and stability of the system, and further affect the heat dissipation of the data center.

[0005] In a first aspect, the embodiments of the present application provide a CDU unit group control method for controlling a machine trip, which is suitable for a CDU unit system. The CDU unit system includes a plurality of CDUs, at least one of which is a working CDU and one of which is a standby CDU. The working CDU includes a first control valve arranged on a primary side and a first water pump and a first bypass valve arranged on a secondary side. The standby CDU includes a second control valve arranged on the primary side and a second water pump and a second bypass valve arranged on the secondary side. The method includes determining the number of current working CDUs and determining a working CDU to be deactivated. When the number of current working CDUs is one, the second bypass valve is controlled to open to a first preset opening degree, the second control valve is controlled to open to a second preset opening degree, and the frequency of the second water pump is increased at a second rate. When the frequency of the second water pump after the increase reaches a first preset frequency and the frequency of the first water pump of the CDU to be deactivated is reduced to 0, PID differential pressure regulation is performed on the standby CDU. When the number of current working CDUs is multiple, the second bypass valve is controlled to open to a first preset opening degree, the second control valve is controlled to open to a second preset opening degree, and the frequency of the second water pump is increased at a first rate. When the frequency of the second water pump after the increase reaches a first preset frequency and the frequency of the first water pump of the CDU to be deactivated is reduced to 0, PID differential pressure regulation is performed on the standby CDU. The first preset opening degree is determined according to the opening degree of the first bypass valve, the second preset opening degree is determined according to the opening degree of the first control valve, and the first preset frequency is determined according to the frequency of the first water pump. The second rate is greater than the first rate.

[0006] In a second aspect, the embodiments of the present application provide a CDU unit system. The CDU unit system includes a plurality of CDUs and a controller. The plurality of CDUs includes at least one working CDU and one standby CDU. The working CDU includes a first control valve arranged on a primary side and a first water pump and a first bypass valve arranged on a secondary side. The standby CDU includes a second control valve arranged on the primary side and a second water pump and a second bypass valve arranged on the secondary side. The controller is connected to the first control valve, the first water pump, the first bypass valve, the second control valve, the second water pump, and the second bypass valve. The controller is configured to execute the method described in the foregoing technical solution.

[0007] The CDU unit group control machine control method and the CDU unit system provided by the embodiment of the present application can control the key components in the working CDU and the standby CDU to be stopped in sequence or after meeting certain machine switching conditions, and simultaneously adjust the action rate and action conditions of the corresponding key components for machine switching in two different situations of multiple working CDUs and one working CDU, so as to avoid the influence of directly starting the components of the standby CDU and directly closing the components of the working CDU to be stopped on the stability of the entire CDU unit system, and to take a relatively fast or relatively slow operation rate according to different situations, so as to realize targeted efficient machine switching or smooth machine switching, reduce the hydraulic or thermal fluctuation of the system during machine switching, improve the reliability and stability of the system, and maintain the heat dissipation of the data center.

[0008] It can be understood that the beneficial effects of the above second aspect can be referred to the related description in the above first aspect, which will not be repeated here. It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present specification. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0010] Figure 1 is a structural schematic diagram of the CDU unit system provided by an embodiment of the present application;

[0011] Figure 2 is a flowchart of the CDU unit group control machine control method provided by an embodiment of the present application;

[0012] Figure 3 is a flowchart of the CDU unit group control machine control method provided by an embodiment of the present application. DETAILED DESCRIPTION

[0013] The present application will be described more clearly in combination with specific embodiments. The following embodiments will help those skilled in the art to further understand the role of the present application, but do not limit the present application in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made. These all belong to the protection scope of the present application.

[0014] In addition, the "multiple" mentioned in the embodiments of the present application should be interpreted as two or more.

[0015] The data center usually configures multiple CDUs and a standby CDU, which include at least one working CDU and one standby CDU. When controlling and switching on and off the working CDU to be deactivated and the standby CDU due to failure or non-failure, the unit parameters of the standby CDU are directly set to be consistent with the unit parameters of the working CDU to be deactivated, and the working CDU to be deactivated is quickly turned off. However, the above machine switching method will have a great impact on the entire CDU unit system, causing a sharp fluctuation of the hydraulic or thermal force of the system, reducing the reliability and stability of the system, and further affecting the heat dissipation of the data center.

[0016] Based on the above problems, the inventor has found that the key components in the working CDU to be deactivated and the standby CDU, such as the control valve on the primary side and the bypass valve and water pump on the secondary side, can be controlled during the machine switching, and the corresponding actions are performed in a certain order or after meeting certain machine switching conditions. At the same time, the action sequence and action rate of the corresponding key components are adaptively adjusted according to different situations of the machine switching caused by failure or non-failure and multiple working CDUs and one working CDU, so as to avoid the impact of directly turning on the components of the standby CDU and directly turning off the components of the working CDU to be deactivated on the stability of the entire CDU unit system, finally realize smooth machine switching, reduce the fluctuation of the hydraulic or thermal force of the system during the machine switching, improve the reliability and stability of the system, and maintain the heat dissipation of the data center.

[0017] Figure 1 is a structural schematic diagram of a CDU unit system provided by an embodiment of the present application. As shown in Figure 1 The CDU unit system in the embodiment of the present application includes a working CDU, a standby CDU and a controller (not shown in the figure). Taking the CDU unit system including one working CDU and one standby CDU as an example, the working CDU and the standby CDU are connected in parallel, and the structures of the working CDU and the standby CDU are consistent, and the plate heat exchanger is used as a partition to divide the waterway into two parts of the primary side and the secondary side. The control valve on the primary side is a key component, and the water pump and the differential pressure bypass valve (referred to as bypass valve) on the secondary side are key components. The working CDU includes a first control valve V1 arranged on the primary side, and a first water pump P1 and a first bypass valve Vp1 arranged on the secondary side. The standby CDU includes a second control valve V2 arranged on the primary side, and a second water pump P2 and a second bypass valve Vp2 arranged on the secondary side. The CDU unit system can also include multiple working CDUs and one standby CDU, and the multiple CDUs and the standby CDU are connected in parallel.

[0018] The controller is connected with the first control valve, the first water pump, the first bypass valve, the second control valve, the second water pump and the second bypass valve respectively, and is used for controlling the actions of the key components. The specific implementation process and principle of the controller in controlling the actions of the key components in the embodiment can be referred to the relevant description of the following embodiments, and will not be described here.

[0019] With reference to Figure 1 The working CDU and the standby CDU include other components such as a temperature sensor denoted by T and a pressure sensor denoted by D. The secondary-side cooling working medium is pressurized by a water pump, and then exchanges heat with the primary-side low-temperature cooling working medium through a plate heat exchanger. The cooled secondary-side cooling working medium is pumped into a load by a CDU unit system, and the cooling working medium cools the load by liquid cooling. After that, the heated secondary-side cooling working medium flows back to the inlet of the CDU main circulating water pump, and continues to circulate and exchange heat.

[0020] The following will be described in detail Figure 1 The CDU unit group control machine shutdown control method of the present application will be described in detail. The method in the embodiment of the present application is applicable to the CDU unit system, and can include:

[0021] Step 201, determine the number of current working CDUs, and determine the working CDU to be stopped. As described above, at least one working CDU is included in the plurality of CDUs. In actual situations, depending on the current operation mode of the CDU unit system, there can be two operation modes of N with 1 standby and 1 with 1 standby. In the embodiment of the present application, different configurations are made for the machine shutdown operations of the two different modes, so it is necessary to determine the number of current working CDUs, that is, to determine the current operation mode of the CDU unit system.

[0022] In addition, the machine shutdown in the embodiment can be divided into automatic machine shutdown due to failure, and manual machine shutdown and periodic automatic machine shutdown due to non-failure reasons. For example, when a certain working CDU needs to be maintained, a user can input a to-be-stopped instruction to realize manual machine shutdown. In order to avoid long-time work of the working CDU, the system usually sets up a round-trip machine shutdown, that is, a to-be-stopped instruction is sent periodically according to the set CDU round-trip sequence and round-trip period, to realize periodic automatic machine shutdown.

[0023] In a possible implementation, the embodiment can also determine the working CDU to be stopped according to the to-be-stopped instruction when the to-be-stopped instruction is obtained, or determine the working CDU to be stopped as the working CDU to be stopped when the working CDU failure is detected.

[0024] Step 202, when the number of current working CDUs is one, control the second bypass valve to open to a first preset opening degree, control the second control valve to open to a second preset opening degree, and increase the frequency of the second water pump at a second rate; when the frequency of the second water pump after the increase reaches a first preset frequency, and the frequency of the first water pump of the CDU to be stopped is reduced to 0, PID differential pressure regulation is performed on the standby CDU.

[0025] The first preset opening degree is determined according to the opening degree of the first bypass valve, the second preset opening degree is determined according to the opening degree of the first control valve, and the first preset frequency is determined according to the frequency of the first water pump.

[0026] In actual application, after the working CDU to be stopped is determined, the opening degree of the first bypass valve, the opening degree of the first control valve, and the frequency of the first water pump of the working CDU to be stopped are obtained, and the opening degree of the first bypass valve is taken as the first preset opening degree, the opening degree of the first control valve is taken as the second preset opening degree, and half of the frequency of the first water pump is taken as the first preset frequency.

[0027] The waiting-to-stop instruction carries the identifier of the CDU, and in this embodiment, the working CDU to be stopped is determined according to the CDU identifier carried by the waiting-to-stop instruction, the working parameters of each working CDU are detected in real time, whether each working CDU is faulty is determined according to the working parameters of each working CDU, and the working CDU that is faulty is determined as the working CDU to be stopped. Then, the opening degree of the first bypass valve, the opening degree of the first control valve, and the frequency of the first water pump of the working CDU to be stopped before the machine is cut off are recorded, such as the latest data of the working CDU to be stopped before the machine is cut off. It should be noted that for automatic machine cutting, the latest normal data of the working CDU to be stopped before the machine is cut off can be recorded.

[0028] To ensure that the performance of the CDU unit system remains unchanged after the machine is cut off, the states of each key component in the standby CDU can be finally consistent with the states of each key component of the working CDU to be stopped before the machine is cut off. That is, the first preset opening degree is set to the opening degree of the first bypass valve, and the second preset opening degree is set to the opening degree of the first control valve.

[0029] Specifically, for the 1-to-1 standby case where the number of current working CDUs is one, the specific machine cutting process combines the control method 2 and the control method 1 in Figure 2 and Figure 3 , which correspond to fault cutting and non-fault cutting respectively.

[0030] Figure 2 ​In control method 2, for example, when the working CDU to be shut down is fault-free, the second bypass valve and the second control valve can be controlled to open to the first preset opening degree and the second preset opening degree respectively, maintaining the state before the working CDU to be shut down. At the same time, the first bypass valve is directly closed, and the frequency of the second water pump is increased. To further reduce the interference caused by machine switching to the system, the second bypass valve, the second control valve, and the second water pump can be controlled to open at a certain rate and in a certain sequence.

[0031] Subsequently, since the first and second water pumps belong to different CDUs, if both pumps start operating simultaneously, it will affect the system flow rate, causing flow fluctuations. Therefore, in this embodiment, when the frequency of the second water pump increases to a first preset frequency, the frequency of the first water pump is then controlled to decrease. As mentioned above, the first preset frequency is determined based on the frequency of the first water pump. To minimize flow fluctuations within the system, the first preset frequency can be set to half the frequency of the first water pump. When the frequency of the first water pump decreases to 0, PID control is applied to the standby CDU to make its operation more stable. For example, differential pressure PID control is applied to the second water pump based on the supply and return water pressure difference of the standby CDU until the second water pump stabilizes. This is because the first and second water pumps belong to different CDUs; if PID control is applied to the second water pump without shutting down the first water pump, the first water pump will affect the accuracy of the PID control.

[0032] In one possible implementation, when the working CDU to be deactivated is fault-free and there is only one working CDU, in this embodiment, when controlling the second control valve to open to the second preset opening degree and increasing the frequency of the second water pump, the second control valve can be controlled to open to the second preset opening degree at a third rate, and the first control valve can be controlled to close at a third rate, and the frequency of the second water pump can be increased at a second rate.

[0033] For example, refer to Figure 2 In control method 2, the third rate can be set according to the performance of the control valve, and the second rate can be set according to the performance of the water pump. For example, the third rate is 3% / s and the second rate is 10% / s. Since the working CDU and the standby CDU usually have the same structure, i.e., the first and second control valves have the same model and performance, the third rate is used to control the first control valve to close and the second control valve to open, ensuring smooth switching. However, when the first and second control valves have different models and performance, the control rates for the first and second control valves can be different, such as setting corresponding control rates according to the performance of the first and second valves respectively.

[0034] It should be noted that, in Figure 2 and Figure 3In the figure, CDU-1 represents the working CDU, CDU-2 represents the standby CDU, V1 represents the first control valve, V2 represents the second control valve, Vp1 represents the first bypass valve, Vp2 represents the second bypass valve, P1 represents the first water pump, P2 represents the second water pump, n represents the frequency of the first water pump, and n / 2 represents half of the frequency of the first water pump.

[0035] In a possible implementation, when the working CDU to be deactivated is fault-free and there is only one working CDU, the embodiment can reduce the frequency of the first water pump to the first preset frequency when the frequency of the second water pump after being increased reaches the first preset frequency, and then reduce the frequency of the first water pump at a second rate. When the frequency of the first water pump is reduced to 0, PID differential pressure regulation is performed on the secondary side of the standby CDU according to the supply and return water pressure difference of the standby CDU, until the frequency of the second water pump does not change within a preset time period, and then PID differential pressure regulation is performed on the primary side of the standby CDU.

[0036] As known from the foregoing, the working CDU and the standby CDU usually have the same structure and composition, that is, the first water pump and the second water pump have the same model and performance, so that the first water pump is controlled to be closed and the second water pump is controlled to be opened at the second rate to ensure that the deactivation is smooth. When the first water pump and the second water pump have different models and performances, the control rates of the first water pump and the second water pump can be different, for example, the corresponding control rates are set according to the performance of the first water pump and the second water pump.

[0037] For example, when the frequency of the first water pump is 0, the embodiment first performs PID differential pressure regulation on the secondary side of the standby CDU according to the difference between the supply and return water pressure difference of the standby CDU and a preset pressure difference, mainly PID differential pressure regulation is performed on the second water pump, until the frequency of the second water pump does not change within a preset time period, that is, the second water pump operates stably, and then PID differential pressure regulation is performed on each component of the primary side of the standby CDU, so that the CDU unit system is more stable.

[0038] It should be noted that after the frequency of the second water pump after being increased reaches the first preset frequency, and before the frequency of the first water pump is reduced to 0, the frequency of the second water pump continues to be increased at the second rate until the frequency of the second water pump after being increased reaches twice the frequency of the first water pump, that is, twice the first preset frequency, and then the increase of the frequency of the second water pump is stopped. If the frequency of the first water pump is reduced to 0, even if the frequency of the second water pump after being increased does not reach the frequency of the first water pump, the frequency of the second water pump is not controlled to be increased, but PID differential pressure regulation is performed on the second water pump.

[0039] Reference Figure 3In a possible implementation of the control method 1 in the control method 1, when the working CDU is one and the working CDU to be stopped fails, the embodiment directly controls the first bypass valve, the first control valve and the first water pump to be closed first, and then controls the second control valve to be opened to the second preset opening degree and increases the frequency of the second water pump. The second control valve can be controlled to be opened to the second preset opening degree at a third rate, and the frequency of the second water pump can be increased at a second rate.

[0040] In some embodiments, when the working CDU to be stopped fails and the working CDU is one, the frequency of the second water pump after being increased reaches the first preset frequency, and the standby CDU is controlled to be PID pressure difference regulated. According to the supply and return water pressure difference of the standby CDU, the secondary side of the standby CDU can be PID pressure difference regulated until the frequency of the second water pump has no change within a preset time period, and the opening degree of the second control valve is the second preset opening degree. The primary side of the standby CDU is PID pressure difference regulated. In addition, the specific implementation process and principle in the embodiment can refer to the related description of the foregoing embodiments, which will not be described here.

[0041] Step 203, when the number of the current working CDU is multiple, the second bypass valve is controlled to be opened to the first preset opening degree, the second control valve is controlled to be opened to the second preset opening degree, and the frequency of the second water pump is increased at a first rate; when the frequency of the second water pump after being increased reaches the first preset frequency, and the frequency of the first water pump of the CDU to be stopped is reduced to 0, the standby CDU is PID pressure difference regulated.

[0042] Specifically, for the N by 1 standby case when the number of the current working CDU is multiple, the specific machine cutting process is combined with Figure 2 and Figure 3 The control method 4 and the control method 3 in the control method 4 and the control method 3 correspond to two cases of fault machine cutting and non-fault machine cutting respectively.

[0043] For example, when the working CDU to be stopped fails in the embodiment, first, the key components of the working CDU to be stopped are closed, and the second bypass valve and the second control valve are controlled to be opened to the first preset opening degree and the second preset opening degree respectively, which is consistent with the state before the working CDU to be stopped is stopped, and the frequency of the second water pump is increased. In order to further reduce the interference caused by machine cutting to the system, the second bypass valve, the second control valve and the second water pump can be controlled to be opened at a certain rate respectively.

[0044] Then, when the frequency of the second water pump is increased to the first preset frequency, such as half of the frequency of the first water pump, the frequency of the second water pump has met the basic demand of the system at this time, and on the basis of guaranteeing the basic demand of the system, the standby CDU can be PID regulated to make the standby CDU reach stability more quickly.

[0045] To further reduce the interference caused by the cutting machine to the system, improve the reliability and stability of the system, the rate and order of the action of each key component of the standby CDU and the standby CDU can also be controlled, and the secondary side and the primary side of the standby CDU are respectively subjected to PID regulation.

[0046] With reference to the control method 4 in Figure 2 In a possible implementation, when there are multiple working CDUs and the working CDU to be stopped is fault-free, the second control valve can be controlled to open to the second preset opening degree at a third rate and the frequency of the second water pump can be increased at a first rate.

[0047] For example, the CDU unit system can include multiple working CDUs and one standby CDU. When only one working CDU is to be stopped, since the other working CDUs are still working, the frequency of the second water pump can be increased at a lower first rate, such as 3% / s, to better maintain the stability of the system.

[0048] In a possible implementation, when there are multiple working CDUs and the working CDU to be stopped is fault-free, the frequency of the first water pump can be reduced, and the standby CDU can be subjected to PID differential pressure regulation. When the frequency of the second water pump after being increased reaches a first preset frequency, the frequency of the first water pump can be reduced at a first rate, and the first control valve can be controlled to close at a third rate. When the frequency of the first water pump is reduced to 0, the first control valve is closed, and the opening degree of the second control valve is the second preset opening degree, the secondary side of the standby CDU is subjected to PID differential pressure regulation according to the supply and return water pressure difference of the standby CDU, until the frequency of the second water pump does not change within a preset time period, and the primary side of the standby CDU is subjected to PID differential pressure regulation.

[0049] As known from the foregoing, when only one working CDU is to be stopped, since the other working CDUs are still working, the frequency of the first water pump can be reduced at a lower first rate, such as 3% / s, to better maintain the stability of the system. In this embodiment, when the frequency of the second water pump after being increased reaches a first preset frequency, the first control valve is controlled to be closed, which can reduce the influence on the system fluctuation. Then, when the frequency of the first water pump is 0, the first control valve is closed, and the opening degree of the second control valve is the second preset opening degree, the secondary side and the primary side of the standby CDU are respectively subjected to PID differential pressure regulation. The specific process and implementation principle of the above-mentioned PID differential pressure regulation of the secondary side and the primary side of the standby CDU can be referred to the foregoing embodiments, which will not be described herein.

[0050] It should be noted that, after the frequency of the second water pump after increasing reaches the first preset frequency, and the frequency of the first water pump has not been reduced to 0, or the first control valve has not been closed, or the opening degree of the second control valve has not reached the second preset opening degree, the frequency of the second water pump continues to be increased at the first rate until the frequency of the second water pump after increasing reaches the frequency of the first water pump, that is, reaches twice the first preset frequency, and then the frequency of the second water pump stops increasing. If the frequency of the first water pump is reduced to 0, and the first control valve is closed and the opening degree of the second control valve is the second preset opening degree, even if the frequency of the second water pump after increasing does not reach the frequency of the first water pump, the frequency of the second water pump is no longer controlled to increase, but the PID differential pressure regulation is performed on the second water pump.

[0051] With reference to the control method 3 in the foregoing Figure 3 In a possible implementation, when there are multiple working CDUs and the working CDU to be stopped fails, in the process of controlling the second control valve to open to the second preset opening degree and increasing the frequency of the second water pump, the second control valve can be controlled to open to the second preset opening degree at a third rate, and the frequency of the second water pump can be increased at the first rate.

[0052] As can be seen from the foregoing, when there is only one working CDU to be stopped, because other working CDUs are still working, the frequency of the second water pump can be increased at a lower first rate, such as 3% / s, to better maintain the stability of the system.

[0053] In some embodiments, when there are multiple working CDUs and the working CDU to be stopped fails, when the frequency of the second water pump after increasing reaches the first preset frequency, the standby CDU is controlled to perform PID differential pressure regulation, which can be PID differential pressure regulation on the secondary side of the standby CDU according to the supply and return water pressure difference of the standby CDU, until the frequency of the second water pump does not change within a preset time period, PID differential pressure regulation is performed on the primary side of the standby CDU. The specific implementation process and principles in the embodiment can be referred to the related description of the foregoing embodiments, which will not be described here.

[0054] In the embodiment, the rate and order of controlling the actions of the key components of the working CDU to be stopped and the standby CDU can further reduce the fluctuation of the system during the machine stopping, achieve smooth machine stopping, and PID regulation on the secondary side and the primary side of the standby CDU respectively, which can improve the reliability and stability of the system.

[0055] In a possible implementation, the working CDU in the embodiment further comprises a first water temperature alarm arranged at the primary side, and the standby CDU further comprises a second water temperature alarm arranged at the primary side. When there is one working CDU and the working CDU to be stopped is fault-free, the embodiment can further close the first water temperature alarm and the second water temperature alarm before closing the first bypass valve, and correspondingly, the second water temperature alarm is reused when the first control valve is closed and the opening degree of the second control valve is the second preset opening degree.

[0056] For example, when there is only one working CDU and one standby CDU, the start and stop of the working CDU and the standby CDU have a greater impact on the water temperature and flow of the system, so the embodiment first closes the water temperature alarms of the working CDU and the standby CDU to be stopped when the machine is cut off, then controls the key components, and then reuses the second water temperature alarm to monitor the cooling liquid temperature after the first control valve and the second control valve reach the target state.

[0057] When there is one working CDU and the working CDU to be stopped is fault, the embodiment can further close the first water temperature alarm and the second water temperature alarm after closing the first control valve, the first water pump and the first bypass valve, and correspondingly, the second water temperature alarm is reused when the frequency of the second water pump does not change within a preset time period and the opening degree of the second control valve is the second preset opening degree.

[0058] For example, the embodiment closes the water temperature alarms of the working CDU and the standby CDU to be stopped after closing the key components of the working CDU to be stopped, then controls the key components of the standby CDU, and then reuses the second water temperature alarm to monitor the cooling liquid temperature after the second water pump is stable and the first control valve and the second control valve reach the target state.

[0059] The CDU unit group control machine cut-off control method and the CDU unit system provided by the embodiment can control the key components in the working CDU and the standby CDU to be stopped when the machine is cut off, perform corresponding actions in a certain order or after a certain machine cut-off condition is met, adjust the action rate and action condition of each key component for machine cut-off in two different situations of multiple working CDUs and one working CDU, avoid the influence of directly starting each component of the standby CDU and directly closing each component of the working CDU to be stopped on the stability of the entire CDU unit system as in the prior art, and take a relatively fast or relatively slow operation rate according to different situations to realize targeted efficient machine cut-off or smooth machine cut-off, reduce the hydraulic or thermal fluctuation of the system when the machine is cut off, improve the reliability and stability of the system, and maintain the heat dissipation of the data center.

[0060] It should be understood that the size of the serial number of each step in the above-mentioned embodiments does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0061] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A CDU unit group controlled switchover control method, characterized by, The application is suitable for a CDU unit system, which comprises a plurality of CDUs, at least one of which is a working CDU and one is a standby CDU; wherein the working CDU comprises a first control valve arranged on a primary side, a first water pump and a first bypass valve arranged on a secondary side; the standby CDU comprises a second control valve arranged on a primary side, a second water pump and a second bypass valve arranged on a secondary side; The method comprises: determining the number of current working CDUs and determining the working CDU to be deactivated; when the number of current working CDUs is one, controlling the second bypass valve to open to a first preset opening degree, controlling the second control valve to open to a second preset opening degree, and increasing the frequency of the second water pump at a second rate; when the frequency of the second water pump after the increase reaches a first preset frequency, and the frequency of the first water pump of the CDU to be deactivated is reduced to 0, PID differential pressure regulation is performed on the standby CDU; when the number of current working CDUs is multiple, controlling the second bypass valve to open to a first preset opening degree, controlling the second control valve to open to a second preset opening degree, and increasing the frequency of the second water pump at a first rate; when the frequency of the second water pump after the increase reaches a first preset frequency, and the frequency of the first water pump of the CDU to be deactivated is reduced to 0, PID differential pressure regulation is performed on the standby CDU; wherein the first preset opening degree is determined according to the opening degree of the first bypass valve, the second preset opening degree is determined according to the opening degree of the first control valve, and the first preset frequency is determined according to the frequency of the first water pump; the second rate is greater than the first rate.

2. The CDU unit group controlled cut machine control method of claim 1, wherein, The method further comprises: if a deactivation instruction is acquired, determining the working CDU to be deactivated according to the deactivation instruction, wherein the deactivation instruction carries the identifier of the CDU; or if a working CDU fault is detected, determining the faulty working CDU as the working CDU to be deactivated; acquiring the opening degree of the first bypass valve, the opening degree of the first control valve, and the frequency of the first water pump of the working CDU to be deactivated, and taking the opening degree of the first bypass valve as the first preset opening degree, the opening degree of the first control valve as the second preset opening degree, and half of the frequency of the first water pump as the first preset frequency.

3. The CDU unit group control switchover control method according to claim 1 or 2, characterized by, when the number of current working CDUs is one, the control of the second control valve to open to a second preset opening degree and the increase of the frequency of the second water pump at a second rate comprises: when the working CDU to be deactivated is fault-free, directly closing the first bypass valve, controlling the second control valve to open to a second preset opening degree at a third rate, controlling the first control valve to close at a third rate, and increasing the frequency of the second water pump at a second rate; when the working CDU to be deactivated is faulty, directly controlling the first bypass valve, the first control valve and the first water pump to close, controlling the second control valve to open to a second preset opening degree at a third rate, and increasing the frequency of the second water pump at a second rate.

4. The CDU unit group controlled machine trip control method of claim 3, wherein, When the number of current working CDUs is one, the PID differential pressure regulation of the standby CDU comprises: When the number of current working CDUs is one, the PID differential pressure regulation of the standby CDU comprises: When the number of current working CDUs is one, the PID differential pressure regulation of the standby CDU comprises:

5. The CDU unit group control switchover control method according to claim 1 or 2, characterized by, When the number of current working CDUs is one, the PID differential pressure regulation of the standby CDU comprises: When the number of current working CDUs is one, the PID differential pressure regulation of the standby CDU comprises: When the number of current working CDUs is one, the PID differential pressure regulation of the standby CDU comprises:

6. The CDU unit group controlled cut machine control method of claim 4, wherein, When the number of current working CDUs is one, the PID differential pressure regulation of the standby CDU comprises: ​ ​ 7. The CDU unit group controlled cut machine control method according to any one of claims 3-6, characterized in that, The first rate is 3% / s, the second rate is 10% / s, and the third rate is 3% / s.

8. The CDU unit group control switchover control method according to claim 4 or 6, characterized by, The working CDU further comprises a first water temperature alarm arranged on the primary side, and the standby CDU further comprises a second water temperature alarm arranged on the primary side. When the working CDU is one, before the first bypass valve is closed, the first water temperature alarm and the second water temperature alarm are closed. Correspondingly, when the working CDU to be disabled is fault-free, when the first control valve is closed and the opening degree of the second control valve is the second preset opening degree, the second water temperature alarm is reused. Correspondingly, when the working CDU to be disabled is fault-free, when the first control valve is closed and the opening degree of the second control valve is the second preset opening degree, the second water temperature alarm is reused.

9. A CDU train system, characterized in that, Comprise: A plurality of CDUs and a controller, wherein the plurality of CDUs comprise at least one working CDU and one standby CDU; the working CDU comprises a first control valve arranged on the primary side, and a first water pump and a first bypass valve arranged on the secondary side, and the standby CDU comprises a second control valve arranged on the primary side, and a second water pump and a second bypass valve arranged on the secondary side; The controller is connected with the first control valve, the first water pump, the first bypass valve, the second control valve, the second water pump and the second bypass valve respectively; and the controller is used for executing the method according to any one of claims 1-8.

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