Room-level centralized cooling capacity distribution unit group control method

Abstract

The invention provides a room-level centralized cooling capacity distribution unit group control method, and relates to the technical field of CDUs, the method comprises the steps that a group control instruction transmitted by an upper computer is received, and the group control instruction comprises group control parameters and setting information of a group control host and group control slaves; a group control host and a slave corresponding to the group control mode in the CDU unit are determined according to the group control instruction, the host synchronizes parameters of the host to the slave and controls the group control host and the slave to work based on the current state and the working mode, and the working parameters of the group control host are the same as or different from those of the slave. According to the embodiment of the invention, the group control host and the slave can be controlled to work according to the current working state and working mode during parameter synchronization, the dependence of the slave on the host is reduced, the influence of host state fluctuation is reduced, and the reliability and stability of a group control system are improved.

Description

Technical Field

[0001] This application relates to the field of CDU technology, and more specifically, to a room-level centralized cooling distribution unit group control method. Background Technology

[0002] A Coolant Distribution Unit (CDU) is a system used for distributing cooling liquid among liquid-cooled electronic devices. It includes components such as sensors, piping, inverters, pumps, and valves. When multiple CDUs share a water supply line to supply water to end-user devices, to prevent pump wear and tear caused by pumps operating at different frequencies, or to avoid the inability of other CDUs to detect a failure when one fails due to the lack of backup, the control units of these CDUs form a group control system (i.e., multiple CDUs constitute a centralized cooling distribution unit). This group control system uses one device as the master controller and the other devices as slave controllers, all working collaboratively according to the commands of the master controller.

[0003] In existing technologies, the slave devices synchronize the working parameters of the master device. This method is heavily dependent on the working status of the master device and is prone to interference with the working status of the slave devices due to fluctuations in the master device's own status, resulting in poor reliability and stability of the group control system. Summary of the Invention

[0004] This application provides a room-level centralized cooling capacity distribution unit group control method, which can solve the problem that existing group control methods heavily rely on the working status of the group control host, and the working status of the slave units is easily affected by the group control host, resulting in poor reliability and stability of the group control system. To achieve this objective, this application provides the following solutions.

[0005] According to one aspect of the embodiments of this application, a room-level centralized cooling capacity distribution unit group control method is provided for a group control system, the group control system comprising multiple CDU units connected in a loop, each CDU unit being connected to a host computer, the method comprising: Receive group control commands transmitted by the host computer, the group control commands including group control parameters and setting information of the group control host and slave devices; The group control master and slave unit corresponding to the group control mode in the CDU unit are determined according to the group control command. The modified parameters of the master unit are synchronized to the slave unit and the group control master and slave unit are controlled to work based on the current state and working mode. The working parameters of the group control master unit are the same as or different from those of the slave unit.

[0006] In one possible implementation, the group control parameters include the number of running units, synchronization parameters, and pump control mode; the method includes: The group control host responds to the group control start command and detects the number of CDU units that have joined the group control; If it is determined that the number of CDU units is less than the number in operation, a warning will be issued indicating that the number of CDU units is insufficient. The addition of the group control includes: Receive mode selection command; If the CDU unit determines that the received mode selection instruction is a group control joining instruction, it sends a group control joining request to the object corresponding to the group control joining instruction to switch to group control mode.

[0007] In one possible implementation, the synchronization of the parameters includes: The slave device determines the modified parameters based on the parameters to be synchronized, obtains the latest modification information of the modified parameters on the group control host, and synchronizes the modified parameters according to the latest modification information; It works based on the modified parameters after synchronization and its own detection parameters.

[0008] In one possible implementation, the operating modes include differential pressure mode and flow mode, controlling the group control host and slave devices to operate based on their current state and operating mode, including: The system controls the operation of the group control host and the slave devices according to the operating mode, and receives instructions to switch from automatic to manual mode. Obtain the object to be changed corresponding to the instruction and the change value corresponding to the parameter, and control the object to be changed to execute the change value.

[0009] In one possible implementation, the secondary side of the CDU unit is equipped with a bypass valve, and the control of the group control master and slave units operates based on the current state and operating mode, including: Determine that the current control mode is used to operate the group control host and the slave unit, and obtain the total flow setting information and the fault information of the CDU unit; The target flow rate of the slave device is determined based on the total flow rate setting information and the fault information, and the bypass valve is controlled to operate based on the target flow rate.

[0010] In one possible implementation, controlling the group control host and slave devices to operate based on their current state and working mode includes: The group control host and the slave are currently operating in differential pressure mode. The target differential pressure value and the secondary water pump frequency of the group control host are synchronized to the slave. The slave device is controlled to obtain its own differential pressure detection value to adjust the two-way valve on the secondary side.

[0011] In one possible implementation, the state includes the running time of the slave device, and controlling the group control host and slave devices to operate based on the current state and working mode includes: If the current cycle adjustment is determined based on the cycle information and the standby unit in the slave unit is fault-free, then the CDU unit currently working in the slave unit is determined, the unit with the longest working time in the CDU unit is stopped, and the unit with the shortest working time in the standby unit is started. The cycle conditions are determined based on the cycle interval.

[0012] In one possible implementation, controlling the group control host and slave devices to operate based on their current state and working mode includes: If the current rotation conditions are met and the standby unit is faulty, the standby unit is started and the currently operating CDU unit is shut down according to the fault level.

[0013] In one possible implementation, the state includes a CDU unit failure, and controlling the group control master and slave units to operate based on the current state and operating mode includes: If a fault is detected in the CDU unit, the number of currently available CDU units is obtained, and the faulty CDU unit is switched over based on the number and the level of the fault.

[0014] In one possible implementation, switching over faulty CDU units based on the quantity and the severity of the CDU unit failure includes: If it is determined that the quantity is insufficient and the level is less than level one, then the faulty CDU unit is controlled to continue operating; If the level is determined to be Level 1, then the faulty CDU unit is shut down.

[0015] The beneficial effects of the technical solutions provided in this application are: The room-level centralized cooling capacity distribution unit group control method provided in this application is used in a group control system. The group control system includes multiple CDU units connected in a loop, and each CDU unit is connected to a host computer. The method includes: receiving group control instructions transmitted by the host computer, the group control instructions including group control parameters and setting information of the group control master and slave units; determining the group control master and slave units corresponding to the group control mode in the CDU units according to the group control instructions; using the master unit to synchronize its own parameters to the slave units and controlling the group control master and slave units to work based on the current state and working mode; the working parameters of the group control master unit may be the same as or different from those of the slave units. The embodiments of this application can control the group control master and slave units to work according to the current working state and working mode during parameter synchronization, reducing the slave units' dependence on the master unit and reducing the impact of master unit state fluctuations, thereby improving the reliability and stability of the group control system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below.

[0017] Figure 1 A flowchart illustrating a room-level centralized cooling capacity distribution unit group control method provided in an embodiment of this application; Figure 2 The execution flowchart of the centralized cooling capacity distribution unit group control method provided in this application; Figure 3 This is a schematic diagram of the CDU unit connection provided in the embodiments of this application. Detailed Implementation

[0018] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.

[0019] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the terms “comprising” and “including” as used in embodiments of this application mean that the corresponding feature can be implemented as the presented feature, information, data, step, operation, element, and / or component, but do not exclude implementation as other features, information, data, step, operation, element, component, and / or combinations thereof supported by the art. It should be understood that when we say that an element is “connected” or “coupled” to another element, the one element can be directly connected or coupled to the other element, or it can mean that the one element and the other element establish a connection relationship through an intermediate element. Furthermore, “connected” or “coupled” as used herein can include wireless connection or wireless coupling. The term “and / or” as used herein indicates at least one of the items defined by the term; for example, “A and / or B” indicates implementation as “A,” or implementation as “A,” or implementation as “A and B.”

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0021] The technical solutions of this application and their effects are described below through several exemplary embodiments. It should be noted that the following embodiments can be referenced, borrowed from, or combined with each other. Identical terms, similar features, and similar implementation steps in different embodiments will not be repeated.

[0022] The room-level centralized cooling capacity distribution unit group control method provided in this application aims to solve at least one technical problem existing in the prior art.

[0023] Optionally, the group control method of this application is used in a group control system, which includes multiple CDU units connected in a loop, each CDU unit being connected to a host computer. The CDUs in the group control system can be room-level centralized cooling capacity distribution units.

[0024] In one embodiment, there can be multiple host computers, each connected to a CDU unit via a master switch. CDU units can be connected sequentially, each CDU unit including a PLC, a slave switch, and an HDMI interface. The PLC is connected to the slave switch and the slave switch of the next CDU unit. The slave switch can be connected to the HDMI interface of the CDU unit, the master switch, and the PLC of the previous CDU unit. The host computer can be a user's environmental monitoring terminal, capable of remotely reading and controlling the operation of the CDU units.

[0025] Optionally, the PLC can be connected to the slave switch via a TCP interface, and CDU units can transmit data between each other via network cable.

[0026] Optionally, such as Figures 1-3 As shown, the room-level centralized cooling capacity distribution unit group control method of this application includes: S101: Receives group control commands transmitted from the host computer.

[0027] Optionally, the group control command includes group control parameters and configuration information for the group control master and slave units. The group control parameters may include the number of units in operation, synchronization parameters, pump control mode, etc. Users can send group control commands to the CDU units in the group control system via a host computer, or input the commands on the command receiving devices of the CDU units (such as operation keyboards, touch screens, etc.) to configure the CDU units to join the group control mode. The number of units in operation can be set according to user needs, thereby improving the flexibility of the group control system, and each CDU unit can be set as a group control master or slave unit according to user requirements.

[0028] Optionally, the CDU unit can operate in either group control mode or standalone mode. The CDU unit can join the group control system based on a received mode selection command. Specifically, joining the group control system includes: receiving a mode selection command; if the CDU unit determines that the received mode selection command is a group control join command, it sends a group control join request to the object corresponding to the join command to switch to group control mode. The object corresponding to the group control command can be the group control host or a host computer.

[0029] Optionally, the mode selection command can be entered directly by the user on the CDU unit, or it can be transmitted from the host computer to the CDU unit. After receiving the mode selection command, the information of the group control host corresponding to the command can be obtained, and a group control join request can be generated based on this information. After sending the group control join request, if the CDU unit receives the join permission information corresponding to the request, it will switch its own working mode to group control mode and connect with the group control host to synchronize the host's parameters.

[0030] Optionally, when setting up the group control (such as entering a group control command), parameters that need to be synchronized between the group control host and slave units can be set (these parameters may also include the target value of the secondary side liquid supply temperature, the target value of the secondary side differential pressure, and the target value of the secondary side flow rate). After the CDU unit joins the group control as a slave unit, it synchronizes the parameters of the group control host based on the setting information.

[0031] Optionally, after joining the group control, the CDU unit can also switch to stand-alone mode according to the received instructions and actual status. When it is running in stand-alone mode, it can operate according to the parameters last modified by the group control host before exiting (such as the set target value of secondary side liquid supply temperature, target value of secondary side differential pressure, and target value of secondary side flow rate) and the parameters it detects itself (such as the flow rate of primary side and secondary side).

[0032] S102: Determine the group control master and slave units corresponding to the group control mode in the CDU unit according to the group control command, synchronize the modified parameters of the master unit to the slave unit, and control the group control master and slave units to work based on the current status and working mode.

[0033] Optionally, the operating parameters of the group control host may be the same as or different from those of the slave devices. The slave devices can synchronize some parameters of the host according to the group control instructions, while the slave devices can determine other parameters based on their current status and operating mode.

[0034] Optionally, after receiving a group control command, the CDU unit can determine whether it is a group control master or slave based on the group control command. Alternatively, the host computer can determine the type of each CDU unit and send a command to the CDU unit specifying whether it is a group control master or slave.

[0035] Optionally, the method of this application includes: the group control host responding to the group control start command, detecting the number of CDU units added to the group control; if it is determined that the number of CDU units is less than the number of operating units, then reminding the user that the number of CDU units is insufficient. This method avoids the group control system from operating when the number of CDU units is insufficient.

[0036] Optionally, when it is determined that the number of CDU units is insufficient, the group control host can send a reminder message about the insufficient number to the host computer so that the host computer can remind the user, or it can remind the user of the insufficient number of CDU units through its own installed display screen.

[0037] Optionally, parameter synchronization includes: the slave device determining the modified parameters based on the parameters to be synchronized, obtaining the latest modification information of the modified parameters on the group control host, and synchronizing and modifying the parameters according to the latest modification information; and operating based on the synchronized modified parameters and its own detection parameters. Specifically, the slave device can periodically query the parameter modification information in the group control host. If it is determined from the modification information that the parameters have been modified since the last synchronization, it will synchronize the parameters with the group control host. This method enables collaborative work between the group control host and the slave devices.

[0038] Optionally, the group control host can also send the latest parameter modification information to the slave device after detecting that the parameter to be synchronized has been modified (such as modified according to the user's instructions), so that the slave device can quickly synchronize the parameters with the group control host.

[0039] Optionally, in group control mode, the operating modes that the group control master and slave units can execute include differential pressure mode and flow mode. Furthermore, the group control master and slave units can adjust the parameter modification method from automatic to manual based on received instructions. Controlling the group control master and slave units based on their current state and operating mode includes: controlling the operation of the group control master and slave units according to the operating mode; receiving instructions to change from automatic to manual; obtaining the object to be changed and the corresponding parameter change value; and controlling the object to be changed to execute the change value. This parameter can be the speed of the pump used to regulate flow rate on the secondary or primary side. This method ensures that only the CDU units whose parameters are manually changed execute the changed parameters, while other CDU units do not follow the change, avoiding the impact of parameter changes on all CDU units and improving the stability of the group control system.

[0040] In one embodiment, the parameter being changed is frequency (such as the pump's operating frequency). When the system is controlled in differential pressure mode, if the user changes the parameter modification method of a CDU unit from automatic to manual, and the target of the change is the group control host, then the currently changed group control host will operate according to the manually changed parameter value, while the other slave units will maintain the frequency output of the group control host at the instant before the manual change, and will not change with the manually set parameter value; if the target of the change is a slave unit, then the currently changed slave unit will operate according to the manually changed parameter value, while the other slave units will maintain the same frequency as the host.

[0041] In one embodiment, in group control mode, when the group control system controls CDU units in flow mode, if the user changes the parameter modification method of a certain CDU unit from automatic to manual, regardless of whether the change is made to the master or slave unit, the CDU unit whose parameters are manually changed will operate according to the manually set parameter values, and the flow control target values ​​of other units in the group control will remain unchanged. (The advantage of this method is that frequent manual changes to the speed of one pump will not cause large fluctuations in the flow of other units, allowing other units to maintain their original flow target values.)

[0042] Optionally, the secondary side of the CDU unit is equipped with a bypass valve to control the operation of the group control host and slave units based on the current status and operating mode. This includes: determining that the current operation of the group control host and slave units is controlled in flow mode, obtaining total flow setting information and fault information of the CDU unit; determining the target flow of the slave unit based on the total flow setting information and fault information, and controlling the bypass valve to operate based on the target flow. This ensures that there is sufficient coolant flow for cooling in flow mode.

[0043] Optionally, when operating in flow mode, the target flow of the slave unit is equal to the total flow setpoint / the number of units in the group control that are running and have no flow meter malfunctions. After determining the target flow of the slave unit, the bypass valve on the secondary side is adjusted according to the flow detection value of the CDU unit.

[0044] In one embodiment, the secondary side of the CDU unit is equipped with a water pump (such as a circulating pump) for regulating flow rate and a two-way valve for connecting the secondary side supply and return lines. The slave unit uses the target flow rate Q0 (i.e., the target value) as the control target and adjusts the water pump speed through PID control to achieve flow control. The specific logic is as follows: First, obtain the target value Q0 for the traffic.

[0045] If the current operating flow rate Q > the target value Q0, then it is first determined whether the current operating frequency of the circulating pump is at the minimum set frequency (default 25Hz, adjustable).

[0046] If the current operating frequency is greater than the minimum set frequency, the circulation pump will be adjusted to reduce the frequency until the flow rate stabilizes within the target range.

Current operating frequency

Minimum set frequency

[0047] If the operating flow rate Q is less than the target value Q0, then it is first determined whether the current opening of the bypass valve on the secondary side (used to send coolant into the reservoir) is 0%. If the current opening of the bypass valve is >0%, first reduce the opening of the bypass valve until the flow rate stabilizes within the target range; If the bypass valve's current opening is 0%, and the operating flow rate Q remains less than the target value Q0 even when the bypass valve's opening is reduced to 0%, then the circulation pump's frequency will be increased until the current flow rate stabilizes within the target range. The circulation pump's frequency can be increased up to 50Hz. If the flow rate requirement cannot be met, the highest frequency output will be maintained.

[0048] Optionally, in flow mode, if the flow meter of the CDU unit malfunctions and there is no backup unit (standby CDU unit) available, or if the CDU unit malfunctions and the "do not trip" function is selected, the malfunctioning unit will maintain its original output. At this time, the target flow value of the other units in the group control will increase, thereby evenly distributing the flow of the malfunctioning unit (if there is no backup unit, it will not stop; if there is a backup unit, but the "do not trip" function is selected for fault level 2, it will not stop; if there is a backup unit, and the started backup unit works normally within 1 minute, and the "do not trip" function is selected for fault level 2, it will stop). The total flow value will increase.

[0049] Optionally, controlling the group control host and slave devices to operate based on their current state and working mode includes: determining that the group control host and slave devices are currently operating in differential pressure mode; synchronizing the target differential pressure value and secondary side water pump frequency of the group control host to the slave devices; controlling the slave devices to obtain their own differential pressure detection value to adjust the two-way valve on the secondary side; and ensuring that the group control host and slave devices operate with the same differential pressure value through parameter synchronization.

[0050] In one embodiment, the CDU unit uses the supply and return pressure difference as the control target and controls the pump speed through PID control to achieve pressure difference control. The specific logic is as follows: First, determine the target value △P0 for the pressure differential. If the current operating pressure differential △P > the target value △P0, then first check if the current operating frequency of the circulating pump is at the minimum set frequency (default 25Hz). If the current operating frequency > the minimum set frequency, then adjust the frequency of the circulating pump to reduce it until the pressure differential stabilizes within the target range. If the current operating frequency equals the minimum set frequency, and the pressure differential requirement cannot be met even when the circulating pump is reduced to the minimum operating frequency, then the circulating pump will maintain its minimum operating frequency, and the bypass valve will be opened until the pressure differential stabilizes within the target range.

[0051] If ΔP < ΔP0, first determine if the current opening of the two-way valve is 0%. If the current opening of the two-way valve is > 0%, first reduce the opening of the bypass valve until the pressure difference stabilizes within the target range. If the current opening of the two-way valve is 0%, and ΔP < ΔP0 still occurs when the bypass valve is reduced to 0%, then increase the frequency of the circulating pump until the current pressure difference stabilizes within the target range. If the circulating pump's maximum frequency is increased to 50Hz and still cannot meet the target pressure difference, then maintain the highest frequency output.

[0052] Optionally, to achieve slave unit polling, reduce the possibility of slave unit failure, and improve the stability of the group control system, the current state includes the slave unit's running time. The control group master and slave units operate based on the current state and working mode, including: if the polling information determines that the polling conditions are met and the backup slave unit is fault-free, then the currently operating CDU unit in the slave unit is identified, the unit with the longest operating time in the CDU unit is stopped, and the unit with the shortest operating time in the backup slave unit is started. The polling conditions are determined based on the polling interval.

[0053] Optionally, the group control host does not participate in the polling process. This method ensures that the group control host is online in real time and guarantees the stability of the group control system, while the slave units participate in the polling process. When starting the standby unit with the shortest operating time, first wait for the standby unit to start up to the predetermined frequency (25Hz), and then stop the unit with the longest operating time (determined by accumulating the operating time) in that CDU unit.

[0054] Optionally, the patrol interval can be determined according to actual needs, and can be 24h, 12h, or other time intervals, without limitation here.

[0055] Optionally, if a standby unit fails during the rotation process, the situation can be handled accordingly. Specifically, the control group master and slave units operate based on their current status and operating mode, including: if the rotation conditions are met and a standby unit fails, the standby unit is activated and the currently operating CDU unit is shut down according to the severity of the failure.

[0056] In one embodiment, during the polling process, if a standby unit experiences a Level 1 alarm, it is not started; if a standby unit experiences a Level 2 alarm, it is also not started; if a standby unit experiences a Level 3 alarm, it is considered to have no effect and will not affect the start-up of the standby unit. The standby unit is started when its operating time is determined to be the shortest (because if the standby unit has a Level 1 or Level 2 fault, the currently operating unit is in better condition than the faulty standby unit, so it is not necessary to start it, as starting it would trigger a failover, which would be meaningless; hence, this strategy is adopted). To avoid the problem of the standby unit starting and then failing while the operating CDU unit has already stopped, after the standby unit starts, it runs for 1 minute (to check whether it will stop quickly due to a fault and whether a fault alarm is triggered), and then the CDU unit with the longest operating time is stopped.

[0057] Optionally, the status includes CDU unit failure. The control group master and slave units operate based on the current status and working mode, including: if a CDU unit failure is detected, obtaining the number of currently available CDU units, and switching the failed CDU unit according to the number and the level of the CDU unit failure. The stable operation of the group control system is ensured by switching the failed CDU unit.

[0058] Optionally, the switching of faulty CDU units can be performed based on the number and the level of the CDU unit failure, including: if it is determined that the number is insufficient and the level is less than level one, then the faulty CDU unit is controlled to continue operating; if it is determined that the level is level one, then the faulty CDU unit is shut down.

[0059] In one embodiment, during fault switching, the faulty CDU unit can be switched or not switched in the event of a Level 2 fault, depending on actual needs. If the Level 2 fault occurs in the group control host, a new group control host is searched according to its number (e.g., each CDU unit is assigned a number 1#, 2#, 3#, 4#, with 1# being the default group control host; if 1# fails, 2# becomes the group control host, and so on). If no backup unit is available, no shutdown will occur when a Level 2 fault is triggered, regardless of whether a Level 2 fault shutdown is selected, but a new group control host will still be selected. For Level 3 faults, the faulty CDU unit continues to operate. Faulty unit switching is based solely on the equipment number sequence, without regard to level. If no backup unit is available, the faulty unit will shut down when a Level 1 fault is triggered (Note: not all Level 1 faults result in shutdown; only emergency stop, low pump inlet pressure, and inverter failure among Level 1 faults are triggered).

[0060] Compared to existing technologies, the room-level centralized cooling capacity distribution unit group control method of this application is used in a group control system. The group control system includes multiple CDU units connected in a loop, and each CDU unit is connected to a host computer. The method includes: receiving group control instructions transmitted by the host computer, the group control instructions including group control parameters and setting information of the group control master and slave units; determining the group control master and slave units corresponding to the group control mode in the CDU units according to the group control instructions; using the master unit to synchronize its own parameters to the slave units and controlling the group control master and slave units to work based on the current state and working mode. The working parameters of the group control master unit may be the same as or different from those of the slave units. The embodiments of this application can control the group control master and slave units to work according to the current working state and working mode during parameter synchronization, reducing the slave units' dependence on the master unit and reducing the impact of master unit state fluctuations, thereby improving the reliability and stability of the group control system.

[0061] The terms "first," "second," "third," "fourth," "1," "2," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in a sequence other than that shown in the illustrations or text descriptions.

[0062] It should be understood that although arrows indicate various operation steps in the flowcharts of this application's embodiments, the order in which these steps are implemented is not limited to the order indicated by the arrows. Unless explicitly stated herein, in some implementation scenarios of this application's embodiments, the implementation steps in each flowchart can be executed in other orders as required. Furthermore, some or all steps in each flowchart may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of these sub-steps or stages can be executed at the same time, and each sub-step or stage can also be executed at different times. In scenarios where execution times differ, the execution order of these sub-steps or stages can be flexibly configured according to requirements, and this application's embodiments do not limit this.

[0063] The above description is only an optional implementation method for some implementation scenarios of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application without departing from the technical concept of this application also fall within the protection scope of the embodiments of this application.

Claims

1. A method for group control of a room-level centralized cooling capacity distribution unit, characterized in that, For a group control system, the group control system includes multiple CDU units connected in a loop, each of the CDU units being connected to a host computer, the method includes: Receive group control commands transmitted by the host computer, the group control commands including group control parameters and setting information of the group control host and slave devices; The group control master and slave unit corresponding to the group control mode in the CDU unit are determined according to the group control command. The modified parameters of the master unit are synchronized to the slave unit and the group control master and slave unit are controlled to work based on the current state and working mode. The working parameters of the group control master unit are the same as or different from those of the slave unit.

2. The room-level centralized cooling capacity distribution unit group control method according to claim 1, characterized in that, The group control parameters include the number of operations, synchronization parameters, and pump control mode; the method includes: The group control host responds to the group control start command and detects the number of CDU units that have joined the group control; If it is determined that the number of CDU units is less than the number in operation, a warning will be issued indicating that the number of CDU units is insufficient. The addition of the group control includes: Receive mode selection command; If the CDU unit determines that the received mode selection instruction is a group control joining instruction, it sends a group control joining request to the object corresponding to the group control joining instruction to switch to group control mode.

3. The room-level centralized cooling capacity distribution unit group control method according to claim 1, characterized in that, The synchronization of the parameters includes: The slave device determines the modified parameters based on the parameters to be synchronized, obtains the latest modification information of the modified parameters on the group control host, and synchronizes the modified parameters according to the latest modification information; It works based on the modified parameters after synchronization and its own detection parameters.

4. The room-level centralized cooling capacity distribution unit group control method according to claim 1, characterized in that, The operating modes include differential pressure mode and flow rate mode, controlling the group control host and slave devices to operate based on their current status and operating mode, including: The system controls the operation of the group control host and the slave devices according to the operating mode, and receives instructions to switch from automatic to manual mode. Obtain the object to be changed corresponding to the instruction and the change value corresponding to the parameter, and control the object to be changed to execute the change value.

5. The room-level centralized cooling capacity distribution unit group control method according to claim 4, characterized in that, The secondary side of the CDU unit is equipped with a bypass valve. The control of the group control host and slave units operates based on the current state and working mode, including: Determine that the current control mode is used to operate the group control host and the slave unit, and obtain the total flow setting information and the fault information of the CDU unit; The target flow rate of the slave device is determined based on the total flow rate setting information and the fault information, and the bypass valve is controlled to operate based on the target flow rate.

6. The room-level centralized cooling capacity distribution unit group control method according to claim 5, characterized in that, The control of the group control host and slave devices based on their current state and working mode includes: The group control host and the slave are currently operating in differential pressure mode. The target differential pressure value and the secondary water pump frequency of the group control host are synchronized to the slave. The slave device is controlled to obtain its own differential pressure detection value to adjust the two-way valve on the secondary side.

7. The room-level centralized cooling capacity distribution unit group control method according to claim 1, characterized in that, The state includes the running time of the slave device, and controls the group control host and slave devices to operate based on the current state and working mode, including: If the current cycle adjustment is determined based on the cycle information and the standby unit in the slave unit is fault-free, then the CDU unit currently working in the slave unit is determined, the unit with the longest working time in the CDU unit is stopped, and the unit with the shortest working time in the standby unit is started. The cycle conditions are determined based on the cycle interval.

8. The room-level centralized cooling capacity distribution unit group control method according to claim 7, characterized in that, Controlling the group control host and slave devices to operate based on their current status and working mode includes: If the current rotation conditions are met and the standby unit is faulty, the standby unit is started and the currently operating CDU unit is shut down according to the fault level.

9. The room-level centralized cooling capacity distribution unit group control method according to claim 1, characterized in that, The status includes CDU unit failure, and the control of the group control master and slave units to operate based on the current status and working mode includes: If a fault is detected in the CDU unit, the number of currently available CDU units is obtained, and the faulty CDU unit is switched over based on the number and the level of the fault.

10. The room-level centralized cooling capacity distribution unit group control method according to claim 9, characterized in that, The switching of faulty CDU units is carried out based on the quantity and the level of fault of the CDU unit, including: If it is determined that the quantity is insufficient and the level is less than level one, then the faulty CDU unit is controlled to continue operating; If the level is determined to be Level 1, then the faulty CDU unit is shut down.

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