Control method of a chiller system and related apparatus

Abstract

The application provides a control method of a chiller system and related devices, which can be used in the field of refrigeration technology. In the technical scheme of the application, the control chiller is controlled to have a chiller outlet water temperature lower than a preset target outlet water temperature in a period before a power price peak, and the control chiller is controlled to have a chiller outlet water temperature higher than the preset target outlet water temperature after the period. In the method, the chiller system can transfer part of the cooling load in a period with a high power price to a period with a low power price, and can obtain more cooling capacity in the period with the low power price and less cooling capacity in the period with the high power price, thereby saving the power consumption cost of the chiller system.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and in particular to control methods and related devices for refrigeration systems. Background Technology

[0002] The chiller system comprises chillers, terminal equipment, a chiller group control system, and a cloud server. The chillers produce refrigerant (such as chilled water) and supply it to the terminal equipment. The terminal equipment circulates indoor air, exchanging heat between the initially warm indoor air and the refrigerant to lower the indoor temperature. The chiller group control system monitors and adjusts the chillers' operating status and parameters. The cloud server sends control commands to the chiller group control system to adjust the chillers' operating status and parameters.

[0003] In practical applications, the peak electricity consumption period of chillers usually coincides with the peak electricity price period, resulting in higher electricity costs. Summary of the Invention

[0004] This application provides a control method and related apparatus for a refrigeration system to solve the problem of high electricity costs in refrigeration systems.

[0005] In a first aspect, this application provides a control method for a chiller system, the chiller system including a cloud server, a chiller group control system, and chillers. The method includes: the cloud server acquiring a preset target outlet water temperature of the chiller during a target time period, wherein the chiller's operating time period includes the target time period and the electricity price during the target time period is higher than a preset electricity price; the cloud server sending a first instruction to the chiller group control system, the first instruction indicating a first target outlet water temperature of the chiller in a first time period, the first target outlet water temperature being lower than the preset target outlet water temperature, and the first time period being earlier than the target time period; the cloud server sending a second instruction to the chiller group control system, the second instruction indicating a second target outlet water temperature of the chiller in a second time period, the second target outlet water temperature being higher than the preset target outlet water temperature, the second time period being after the first time period, and the start time of the second time period being no later than the start time of the target time period.

[0006] In one example, the target time period may include peak electricity price periods, such as from 8:00 AM to 12:00 PM. Alternatively, the target time period may also include peak electricity consumption periods.

[0007] In this method, the preset target outlet water temperature can be the chilled water outlet temperature under standard operating conditions. For example, the preset target outlet water temperature can be 7 degrees Celsius (°C).

[0008] In this method, "the first time period is earlier than the target time period" means that the end time of the first time period is earlier than or equal to the start time of the target time period. For example, assuming the target time period is from 8:00 AM to 12:00 PM, the latest end time of the first time period is 8:00 AM.

[0009] In this method, the first target outlet water temperature can be the lowest outlet water temperature of the chiller in the first time period. That is, the outlet water temperature of the chiller in the first time period can be the first target outlet water temperature, or it can be between the first target outlet water temperature and the preset target outlet water temperature.

[0010] In this method, the second time period is located after the first time period, and the start time of the second time period is not later than the start time of the target time period means that the start time of the second time period is located between the end time of the first time period and the start time of the target time period, and includes the end time of the first time period and the start time of the target time period.

[0011] For example, assuming the target time period is from 8:00 AM to 12:00 PM, and the first time period ends at 8:00 AM, then the second time period begins at 8:00 AM.

[0012] In this method, the second target outlet water temperature can be the highest outlet water temperature of the chiller in the second time period. That is, the outlet water temperature of the chiller in the second time period can be the second target outlet water temperature, or it can be between the second target outlet water temperature and the preset target outlet water temperature.

[0013] By using cloud servers and a chiller group control system, the chiller outlet water temperature is controlled to be lower than the preset target outlet water temperature in the first period and higher than the preset target outlet water temperature in the second period. This allows some of the cooling load during the target period when electricity prices are higher to be transferred to the first period when electricity prices are lower. The chiller system can obtain more cooling capacity (i.e., cooling load) during the first period when electricity prices are lower and less cooling capacity during the second period when electricity prices are higher, thus saving on the chiller system's electricity costs.

[0014] In some possible implementations, the duration of the first time period is equal to the duration of the second time period, and the first difference between the first target outlet water temperature and the preset target outlet water temperature is equal to the second difference between the second target outlet water temperature and the preset target outlet water temperature.

[0015] In one example, assuming the target time period is from 8:00 AM to 12:00 PM, the first time period could be from 7:30 AM to 8:00 AM, and the second time period could be from 8:00 AM to 8:30 AM.

[0016] In this example, it is assumed that the preset target outlet water temperature of the chiller is 7°C, the outlet water temperature of the chiller in the first period is the first target outlet water temperature, which can be 5°C, and the outlet water temperature of the chiller in the second period is the second target outlet water temperature, which can be 9°C.

[0017] In this example, since the duration of the first time period is equal to the duration of the second time period, and the first difference between the first target outlet water temperature and the preset target outlet water temperature is equal to the second difference between the second target outlet water temperature and the preset target outlet water temperature, this ensures that the extra cooling capacity provided by the chiller system in the first time period is equal to the less cooling capacity provided by the chiller system in the second time period. This prevents the problem of low cooling capacity utilization due to excessive accumulated cooling capacity at the end of the second time period, and also prevents the situation where insufficient accumulated cooling capacity at the end of the second time period fails to meet the temperature required by the terminal equipment, thus preventing the environment where the terminal equipment is located from reaching the preset target indoor temperature.

[0018] In some possible implementations, the method may further include: the cloud server sending a third instruction to the chiller group control system, the third instruction indicating a first target indoor temperature in the environment where the terminal devices connected to the chiller are located during the first time period, the first target indoor temperature being lower than a preset target indoor temperature of the environment during the target time period; the cloud server sending a fourth instruction to the chiller group control system, the fourth instruction indicating a second target indoor temperature in the environment during the second time period, the second target indoor temperature being higher than the preset target indoor temperature.

[0019] In this method, the preset target indoor temperature can be the indoor temperature under standard operating conditions. For example, the preset target indoor temperature can be 26℃.

[0020] In this method, the first target indoor temperature can be the lowest indoor temperature of the environment where the terminal equipment connected to the chiller is located during the first time period. That is, the indoor temperature of the environment during the first time period can be the first target indoor temperature or it can be between the first target indoor temperature and the preset target indoor temperature.

[0021] Since the chiller's outlet water temperature is at the preset target outlet water temperature, the indoor temperature of the environment where the terminal equipment connected to the chiller is located can reach the preset target indoor temperature. Therefore, when the chiller lowers the outlet water temperature in the first period, the indoor temperature can be brought down to below the preset target indoor temperature. Thus, lowering the indoor temperature in the first period can improve the utilization rate of the cooling capacity provided by the chiller system in the first period.

[0022] In this method, the second target indoor temperature can be the highest indoor temperature of the environment where the terminal equipment connected to the chiller is located during the second time period. That is, the indoor temperature of the environment during the second time period can be the second target indoor temperature, or it can be between the second target indoor temperature and the preset target indoor temperature.

[0023] Since the indoor temperature in the second period is higher than the preset target indoor temperature, the cooling capacity required to reach the indoor temperature in the second period is less than that required to reach the preset target indoor temperature. This allows the chiller system to obtain less cooling capacity in the second period, thus saving on the chiller system's electricity costs during the second period.

[0024] In some possible implementations, the duration of the first time period is equal to the duration of the second time period, and the third difference between the first target indoor temperature and the preset target indoor temperature is equal to the fourth difference between the second target indoor temperature and the preset target indoor temperature.

[0025] In one example, assuming the target time period is from 8:00 AM to 12:00 PM, the first time period could be from 7:30 AM to 8:00 AM, and the second time period could be from 8:00 AM to 8:30 AM.

[0026] In this example, it is assumed that the preset target indoor temperature of the chiller is 26°C, the indoor temperature of the environment where the terminal device connected to the chiller is located in the first time period can be the first target indoor temperature, which is 24°C, and the indoor temperature of the environment where the terminal device connected to the chiller is located in the second time period can be the second target outlet water temperature, which is 28°C.

[0027] In some possible implementations, the method may further include: the cloud server sending a fifth instruction to the chiller group control system, the fifth instruction being used to indicate a third target outlet water temperature of the chiller in a third time period, the third target outlet water temperature being equal to the preset target outlet water temperature, the third time period being after the second time period.

[0028] In this method, the third time period following the second time period means that the start time of the third time period is after the end time of the second time period, or the start time of the third time period is equal to the end time of the second time period.

[0029] In this method, the start time of the third time period can be the moment when the extra cooling capacity provided by the chiller system in the first time period is exactly equal to the less cooling capacity provided by the chiller system in the second time period. Setting the outlet water temperature of the chiller in the third time period to the preset target outlet water temperature can prevent the chiller system from providing insufficient cooling capacity in the third time period due to the outlet water temperature of the chiller still being higher than the preset target outlet water temperature, thus preventing the terminal equipment from obtaining the required temperature.

[0030] In some possible implementations, the method may further include: the cloud server sending a sixth instruction to the chiller group control system, the sixth instruction being used to indicate the third target indoor temperature of the environment in the third time period, the third target indoor temperature being equal to the preset target indoor temperature.

[0031] In this method, the indoor temperature of the environment where the terminal equipment connected to the chiller is located in the third period is set to the preset target indoor temperature. This can avoid the problem that the cooling capacity provided by the chiller system in the third period exceeds the cooling capacity required by the indoor temperature in the third period when the outlet water temperature of the chiller drops to the preset target outlet water temperature in the third period but the indoor temperature in the third period is still higher than the preset target indoor temperature. This improves the utilization rate of the cooling capacity provided by the chiller system in the third period.

[0032] In some possible implementations, the first target outlet water temperature is one of a plurality of first outlet water temperatures, and during the first time period, the electricity cost of the chiller when it is at the first target outlet water temperature is lower than the electricity cost of the chiller when it is at any of the plurality of first outlet water temperatures other than the first target outlet water temperature; the second target outlet water temperature is one of a plurality of second outlet water temperatures, and during the second time period, the electricity cost of the chiller when it is at the second target outlet water temperature is lower than the electricity cost of the chiller when it is at any of the plurality of second outlet water temperatures other than the second target outlet water temperature; the first target indoor temperature is one of a plurality of first indoor temperatures, and during the first time period, the electricity cost of the environment when it is at the first target indoor temperature is lower than the electricity cost of the environment when it is at any of the plurality of first indoor temperatures other than the first target indoor temperature; the second target indoor temperature is one of a plurality of second indoor temperatures, and during the second time period, the electricity cost of the environment when it is at the second target indoor temperature is lower than the electricity cost of the environment when it is at any of the plurality of second indoor temperatures other than the second target indoor temperature.

[0033] In this method, the first target outlet water temperature can be predicted. As an example, the cloud server can receive multiple first outlet water temperatures input by the user. Using the controlled variable method, while keeping the chiller's pre-cooling time and indoor temperature constant, it calculates the electricity cost for each of the multiple first outlet water temperatures, and determines the first outlet water temperature with the lowest electricity cost as the first target outlet water temperature. Each of these multiple first outlet water temperatures is lower than the preset target outlet water temperature.

[0034] For example, assuming the preset target outlet water temperature is 7℃, and multiple first outlet water temperatures are 5.4℃, 5.2℃, 5℃, 4.8℃, and 4.6℃, then, while keeping the chiller's advance cooling time and indoor temperature constant, calculate the electricity cost for each of the multiple first outlet water temperatures. If the chiller has the lowest electricity cost when the outlet water temperature in the first time period is 5℃, then determine that the first target outlet water temperature as 5℃.

[0035] Optionally, the first target outlet water temperature can also be directly set. For example, the user can input the parameter value of the first target outlet water temperature into the cloud server, and the cloud server can determine the first target outlet water temperature based on the parameter value.

[0036] It is understandable that the methods for determining the second target outlet water temperature, the first target indoor temperature, and the second target indoor temperature are the same as those for determining the first target outlet water temperature, so they will not be repeated here.

[0037] In some possible implementations, the method may further include: the cloud server sending a seventh instruction to the chiller group control system, the seventh instruction being used to instruct the chiller to start cooling at a target time, the target time being no later than the start time of the first time period.

[0038] In this method, the target time being no later than the start time of the first time period means that the target time is equal to or earlier than the start time of the first time period.

[0039] Controlling the chiller to start cooling at the target time ensures that the chiller is in the on or running state at the beginning of the first period.

[0040] Optionally, the chiller can also receive a power-on command from the user at or before the target time, and the chiller will start cooling after receiving the power-on command from the user.

[0041] Secondly, this application provides a control device for a refrigeration system, which may include various functional modules for implementing the method in the first aspect. Any functional module may be implemented in software and / or hardware. For example, the device includes an acquisition module and a transmission module.

[0042] The acquisition module can be used by the cloud server to acquire the preset target outlet water temperature of the chiller during a target time period, wherein the chiller's operating time period includes the target time period and the electricity price during the target time period is higher than the preset electricity price; the sending module can be used by the cloud server to send a first instruction to the chiller group control system, wherein the first instruction is used to indicate the first target outlet water temperature of the chiller in the first time period, wherein the first target outlet water temperature is lower than the preset target outlet water temperature and the first time period is earlier than the target time period; the sending module can also be used by the cloud server to send a second instruction to the chiller group control system, wherein the second instruction is used to indicate the second target outlet water temperature of the chiller in the second time period, wherein the second target outlet water temperature is higher than the preset target outlet water temperature, wherein the second time period is after the first time period and the start time of the second time period is not later than the start time of the target time period.

[0043] Optionally, the sending module can also be used to send a third instruction from the cloud server to the chiller group control system. The third instruction is used to indicate the first target indoor temperature of the environment where the terminal device connected to the chiller is located during the first time period. The first target indoor temperature is lower than the preset target indoor temperature of the environment during the target time period.

[0044] Optionally, the sending module can also be used to send a fourth instruction from the cloud server to the chiller group control system, the fourth instruction being used to indicate the second target indoor temperature of the environment in the second time period, the second target indoor temperature being higher than the preset target indoor temperature.

[0045] Optionally, the sending module can also be used to send a fifth instruction from the cloud server to the chiller group control system. The fifth instruction is used to indicate the third target outlet water temperature of the chiller in the third time period. The third target outlet water temperature is equal to the preset target outlet water temperature. The third time period is located after the second time period.

[0046] Optionally, the sending module can also be used to send a sixth instruction from the cloud server to the chiller group control system, the sixth instruction being used to indicate the third target indoor temperature of the environment in the third time period, the third target indoor temperature being equal to the preset target indoor temperature.

[0047] Optionally, the sending module can also be used to send a seventh instruction from the cloud server to the chiller group control system, the seventh instruction being used to instruct the chiller to start cooling at a target time, the target time being no later than the start time of the first time period.

[0048] It is understood that the control device for the refrigeration system provided in the second aspect can be a control chip or a control system.

[0049] Thirdly, this application provides a control device for a refrigeration system, which may include various modules for implementing the method in the first aspect. For example, the device may include a processor and a transceiver, and optionally, may also include a memory.

[0050] The processor can be used to execute program instructions to implement the instructions executed by the method in the first aspect.

[0051] Interface circuits can be used to: input processor's execution instructions or output data generated by processor's execution instructions.

[0052] Memory can be used to: store instructions executed by the processor, store input data required by the processor to run instructions, or store data generated after the processor runs instructions.

[0053] Fourthly, this application provides a computer-readable storage medium for storing program code executed by a processor, the program code including instructions for implementing the method in the first aspect.

[0054] Fifthly, this application provides a computer program product that, when run on a processor, enables the control device of the chiller system to implement the method in the first aspect.

[0055] It is understood that the technical effects achieved by the control device, computer-readable storage medium, and computer program product of the refrigeration system provided in this application can be referred to the first aspect. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of a chiller system architecture to which this application applies;

[0057] Figure 2 A schematic flowchart of a control method for a refrigeration system provided in this application embodiment;

[0058] Figure 3 A schematic diagram of a first time period and a second time period provided for one embodiment of this application;

[0059] Figure 4 A schematic diagram illustrating a first time period, a second time period, and a third time period provided for one embodiment of this application;

[0060] Figure 5 A schematic diagram of the outlet water temperature of a chiller system provided in one embodiment of this application during the first, second, and third time periods;

[0061] Figure 6 A schematic diagram of indoor temperatures during a first time period, a second time period, and a third time period, provided for one embodiment of this application;

[0062] Figure 7 A schematic diagram of the cooling load of a refrigeration system provided in one embodiment of this application during the first, second, and third time periods;

[0063] Figure 8 A schematic diagram of the structure of a control device for a refrigeration system provided in one embodiment of this application;

[0064] Figure 9 A schematic diagram of the structure of the control device for a refrigeration system provided in another embodiment of this application. Detailed Implementation

[0065] To better understand the purpose, technical solution, and advantages of this application, further explanation will follow with reference to the accompanying drawings. Obviously, the described embodiments are only a portion of the embodiments of this application, not all of them. All other embodiments obtained based on the embodiments in this application are within the scope of protection of this application.

[0066] The method of this application can be applied to scenarios where refrigeration is achieved through a chiller system, such as refrigerator refrigeration, indoor refrigeration (i.e., air conditioning refrigeration), and industrial equipment refrigeration. As an example, this application can be applied to a photovoltaic storage and cold charging system, which includes a chiller system and industrial equipment. The chiller system can produce a refrigerant and deliver the produced refrigerant to the industrial equipment for cooling, thereby reducing the temperature of the industrial equipment and enabling it to operate continuously, thus meeting the needs of industrial production.

[0067] Figure 1 This is a schematic diagram of a chiller system architecture to which this application applies. Figure 1 As shown, the refrigeration system may include a cloud server, a refrigeration group control system, refrigeration units, and terminal devices.

[0068] The cloud server can receive information from the chiller group control system, which may include the chiller's on / off status and operating parameters. The chiller's on / off status includes both "on" and "off" states. The chiller's operating parameters include voltage, current, power, temperature, pressure, flow rate, and liquid level, among others. The chiller's temperature parameters may include the chilled water outlet temperature. For example, under standard operating conditions, the chiller's chilled water outlet temperature is 7 degrees Celsius (°C).

[0069] In addition, this information may also include the indoor temperature of the environment where the terminal device is located.

[0070] After receiving the chiller's on / off status, operating parameters, and indoor temperature, the cloud server can determine whether to adjust these settings based on its configured control logic. If adjustment is needed, it sends a control command to the chiller group control system to instruct the system to adjust these settings accordingly.

[0071] The chiller group control system can collect information such as the chiller's on / off status, operating parameters, and the indoor temperature of the terminal equipment's environment, and send the collected information to the cloud server. In addition, the chiller group control system can receive control commands from the cloud server and perform corresponding operations based on those commands.

[0072] As an example, suppose the chiller group control system receives a control command from the cloud server, which instructs the system to adjust the chiller's outlet water temperature. The chiller group control system then adjusts the chiller's outlet water temperature based on the control command.

[0073] For example, assuming the original chiller outlet water temperature is 7°C, and the cloud server needs to increase the chiller outlet water temperature by 1°C, the cloud server can send a control command to the chiller group control system. This control command is used to instruct the chiller outlet water temperature to be set to 8°C. After receiving the control command, the chiller group control system can set the chiller outlet water temperature to 8°C based on the control command.

[0074] Optionally, the chiller group control system can be a control system, controller, or control chip, and this application does not limit this.

[0075] A chiller can be used to produce a refrigerant (such as chilled water) and deliver it to terminal devices. A chiller may include components such as a compressor, condenser, expansion valve, and evaporator. The compressor, condenser, expansion valve, and evaporator are connected in sequence by pipes to form a closed system. The refrigerant continuously circulates in this system, undergoes state changes, and exchanges heat with the outside environment.

[0076] Terminal devices can transfer cooling capacity from chillers to rooms via chilled water for heat exchange. For example, terminal devices may include components such as evaporators, pipes, chilled water pumps, and fan coil units.

[0077] In practical applications, the peak usage periods of chillers often coincide with the peak electricity price periods, resulting in higher operating costs for chiller systems.

[0078] In a scheduling method for a chiller system, the boundary conditions for optimal scheduling are first determined, and the optimization objective is to minimize the system operating cost, thus obtaining an optimal scheduling model. Then, the model is solved using an optimization solving tool to obtain the planned number of base-load units and dual-condition units and the hourly ice melting amount. Finally, the load level for each time period is determined, and the base-load units and dual-condition units are adjusted based on the load level.

[0079] In this method, the dual-mode unit is an ice storage cooling device. It stores cold during off-peak hours and releases it during peak hours, thus achieving peak shaving and valley filling through energy storage. However, the ice storage cooling device is an addition to the chiller system, requiring additional costs.

[0080] In addition, this method simplifies the objective function of the optimization scheduling model. That is, the minimum operating cost of the system obtained by using the objective function is an approximation, which has an error compared with the actual value of the minimum operating cost of the system, thus affecting the accuracy of the optimization scheduling.

[0081] The technical solution of this application eliminates the need for additional ice storage equipment. By utilizing the time delay of the cooling load, the chiller's outlet water temperature is controlled to be lower than the preset target outlet water temperature for a period before the peak electricity price period, and higher than the preset target outlet water temperature after that period. This allows the chiller system to shift part of the cooling load from peak electricity price periods to periods with lower electricity prices, and to obtain more cooling capacity during periods with lower electricity prices and less cooling capacity during periods with higher electricity prices, thus saving on the chiller system's electricity costs.

[0082] In the technical solution of this application, when controlling the chiller outlet water temperature to be lower than a preset target outlet water temperature during a period before the peak electricity price period, it is also possible to control the indoor temperature of the environment where the terminal equipment connected to the chiller is located to be lower than a preset target indoor temperature, and to control the indoor temperature of the chiller to be higher than the preset target indoor temperature after the peak electricity price period. In this application, the lowest temperature of the chiller outlet water temperature during the period before the peak electricity price period can be the first target outlet water temperature. When the outlet water temperature is the first target outlet water temperature, the cooling capacity provided by the chiller system to the room during that period can make the indoor temperature lower than the target indoor temperature. Therefore, reducing the indoor temperature during that period can improve the utilization rate of the cooling capacity provided by the chiller system.

[0083] Figure 2 This is a schematic flowchart illustrating a control method for a refrigeration system provided in an embodiment of this application. Figure 2 As shown, the method may include S201, S202 and S203.

[0084] S201, the cloud server obtains the preset target outlet water temperature of the chiller during the target time period, the chiller's working time period includes the target time period and the electricity price during the target time period is higher than the preset electricity price.

[0085] In this embodiment, the cloud server can be as follows: Figure 1 In the system architecture shown, the cloud servers and cold servers can be, for example, Figure 1 The cold unit in the system architecture shown.

[0086] In this embodiment, the preset target outlet water temperature can be the chilled water outlet water temperature under standard operating conditions. For example, the preset target outlet water temperature can be 7°C.

[0087] In one possible implementation, the cloud server can receive electricity prices for multiple time periods input by the user, as well as a preset electricity price, and determine one or more time periods with prices higher than the preset price as the target time period. Once the cloud server determines the target time period, it can directly obtain the preset target outlet water temperature of the chiller during that time period.

[0088] Optionally, after the cloud server determines the target time period, it can first obtain the historical operating data and load information of the chiller, and predict the cooling load of the chiller in the target time period based on the historical operating data and load information of the chiller. When the cooling load of the chiller in the target time period exceeds the preset load threshold, the preset target outlet water temperature of the chiller in the target time period is obtained.

[0089] In this embodiment, the target time period may include peak electricity price periods. Optionally, the target time period may also include peak electricity consumption periods.

[0090] S202, the cloud server sends a first instruction to the chiller group control system. The first instruction is used to indicate the first target outlet water temperature of the chiller in the first time period. The first target outlet water temperature is lower than the preset target outlet water temperature, and the first time period is earlier than the target time period.

[0091] In this embodiment, the chiller group control system can be as follows: Figure 1 The chiller group control system shown.

[0092] In this embodiment, "the first time period is earlier than the target time period" means that the end time of the first time period is earlier than or equal to the start time of the target time period. For example, assuming the target time period is from 8:00 AM to 12:00 PM, the end time of the first time period is no later than 8:00 AM.

[0093] In this embodiment, the first target outlet water temperature can be the lowest outlet water temperature of the chiller in the first time period. That is, the outlet water temperature of the chiller in the first time period can be the first target outlet water temperature, or it can be between the first target outlet water temperature and the preset target outlet water temperature.

[0094] In one possible implementation, the first target outlet water temperature can be directly set. For example, the user can input a parameter value for the first target outlet water temperature into the cloud server, and the cloud server can determine the first target outlet water temperature based on that parameter value.

[0095] In another possible implementation, the first target outlet water temperature can be predicted. As an example, the cloud server can receive multiple first outlet water temperatures input by the user, and using a controlled variable method, while keeping the chiller's pre-cooling time and indoor temperature constant, calculate the electricity cost for each of the multiple first outlet water temperatures, and determine the first outlet water temperature with the lowest electricity cost as the first target outlet water temperature. Each of these multiple first outlet water temperatures is lower than the preset target outlet water temperature.

[0096] In other words, the first target outlet water temperature can be one of multiple first outlet water temperatures, and in the first time period, the electricity cost of the chiller when the first target outlet water temperature is lower than the electricity cost of the chiller when the first outlet water temperature is any one of the multiple first outlet water temperatures other than the first target outlet water temperature.

[0097] For example, assuming the preset target outlet water temperature is 7℃, and multiple first outlet water temperatures are 5.4℃, 5.2℃, 5℃, 4.8℃, and 4.6℃, then, while keeping the chiller's advance cooling time and indoor temperature constant, calculate the electricity cost for each of the multiple first outlet water temperatures. If the chiller has the lowest electricity cost when the outlet water temperature in the first time period is 5℃, then determine that the first target outlet water temperature as 5℃.

[0098] Understandably, the first target outlet water temperature should not be lower than the minimum outlet water temperature of the chiller.

[0099] In this embodiment, the cloud server sends a first instruction to the chiller group control system, and the chiller group control system can receive the first instruction. After receiving the first instruction, the chiller group control system can set the first target outlet water temperature of the chiller in the first time period based on the first instruction.

[0100] S203, the cloud server sends a second instruction to the chiller group control system. The second instruction is used to indicate the second target outlet water temperature of the chiller in the second time period. The second target outlet water temperature is higher than the preset target outlet water temperature. The second time period is after the first time period, and the start time of the second time period is not later than the start time of the target time period.

[0101] In this embodiment, the second time period is located after the first time period, and the start time of the second time period is not later than the start time of the target time period means that the start time of the second time period is located between the end time of the first time period and the start time of the target time period, and includes the end time of the first time period and the start time of the target time period.

[0102] For example, assuming the target time period is from 8 a.m. to 12 p.m., the start time of the second time period is no later than 8 a.m.

[0103] In this embodiment, the second target outlet water temperature can be the highest outlet water temperature of the chiller in the second time period. That is, the outlet water temperature of the chiller in the second time period can be the second target outlet water temperature, or it can be between the second target outlet water temperature and the preset target outlet water temperature.

[0104] In one possible implementation, the second target outlet water temperature can be directly set. For example, the user can input the parameter value of the second target outlet water temperature in the cloud server, and the second instruction is used to instruct the chiller to set the highest outlet water temperature in the second time period as the second target outlet water temperature.

[0105] In another possible implementation, the second target outlet water temperature can be predicted. As an example, a user can input multiple second outlet water temperatures into a cloud server. Using the controlled variable method, while keeping the chiller's advance cooling time and indoor temperature constant, the power cost for each of the multiple second outlet water temperatures is calculated, and the second outlet water temperature with the lowest power cost is determined as the second target outlet water temperature. Each of these multiple second outlet water temperatures is higher than the preset target outlet water temperature.

[0106] In other words, the second target outlet water temperature can be one of multiple second outlet water temperatures, and in the second period, the electricity cost of the chiller when the second target outlet water temperature is lower than the electricity cost of the chiller when the second outlet water temperature is any one of the multiple second outlet water temperatures other than the second target outlet water temperature.

[0107] For example, assuming the preset target outlet water temperature is 7℃, and multiple secondary outlet water temperatures are 8.6℃, 8.8℃, 9℃, 9.2℃, and 9.4℃, then, while keeping the chiller's advance cooling time and indoor temperature constant, calculate the electricity cost for each of the multiple secondary outlet water temperatures. If the chiller's electricity cost is lowest when the outlet water temperature in the second time period is 9℃, then determine that the secondary target outlet water temperature as 9℃.

[0108] In this embodiment, the cloud server sends a second instruction to the chiller group control system, and the chiller group control system can receive the second instruction. After receiving the second instruction, the chiller group control system can set the second target outlet water temperature of the chiller in the second time period based on the second instruction.

[0109] In this method, a cloud server and a chiller group control system are used to control the chiller's outlet water temperature to be lower than the preset target outlet water temperature in the first period and higher than the preset target outlet water temperature in the second period. This allows the chiller system to obtain more cooling capacity (i.e., cooling load) during periods of lower electricity prices and less cooling capacity during periods of higher electricity prices, thus shifting some of the cooling load from peak electricity price periods to periods of lower electricity prices and saving on the chiller system's electricity costs.

[0110] Optionally, the duration of the first time period can be equal to the duration of the second time period. Correspondingly, the first difference between the first target outlet water temperature and the preset target outlet water temperature can be equal to the second difference between the second target outlet water temperature and the preset target outlet water temperature.

[0111] Optionally, the end time of the first time period can be equal to the start time of the second time period, and the end time of the first time period can be the start time of the target time period.

[0112] Figure 3 This is a schematic diagram of a first time period and a second time period provided in an embodiment of this application. In this embodiment, it is assumed that the target time period is from 8:00 AM to 12:00 PM, the start time of the first time period is 7:30 AM, the end time of the first time period and the start time of the second time period are both 8:00 AM, and the end time of the second time period is 8:30 AM.

[0113] In this example, the duration of the first time period is equal to the duration of the second time period, and the first difference between the first target outlet water temperature and the preset target outlet water temperature is equal to the second difference between the second target outlet water temperature and the preset target outlet water temperature.

[0114] In one possible implementation, the duration of the first time period can be set directly. For example, the user can input the duration of the first time period in the cloud server.

[0115] In another possible implementation, the duration of the first time period can be predicted. As an example, the user can input multiple durations into the cloud server and, using the controlled variable method, calculate the electricity cost of the chiller for each of the multiple durations while keeping the chiller outlet water temperature and indoor temperature constant. The duration with the lowest electricity cost is then determined as the duration of the first time period.

[0116] In this method, when the duration of the first time period is equal to the duration of the second time period, the first difference between the first target outlet water temperature and the preset target outlet water temperature is equal to the second difference between the second target outlet water temperature and the preset target outlet water temperature. This ensures that the extra cooling capacity provided by the chiller in the first time period is exactly equal to the less cooling capacity provided by the chiller in the second time period, thereby reducing complexity.

[0117] In some possible implementations, the method may further include: the cloud server sending a third instruction to the chiller group control system, the third instruction being used to indicate a first target indoor temperature of the environment where the terminal device connected to the chiller is located in a first time period, the first target indoor temperature being lower than a preset target indoor temperature of the environment in the target time period; the cloud server sending a fourth instruction to the chiller group control system, the fourth instruction being used to indicate a second target indoor temperature of the environment in a second time period, the second target indoor temperature being higher than a preset target indoor temperature.

[0118] In this embodiment, the preset target indoor temperature can be the indoor temperature under standard operating conditions. For example, the preset target indoor temperature can be 26°C.

[0119] In this embodiment, the first target indoor temperature can be the lowest indoor temperature of the environment where the terminal device connected to the chiller is located during the first time period. That is, the indoor temperature of the environment during the first time period can be the first target indoor temperature, or it can be between the first target indoor temperature and the preset target indoor temperature.

[0120] In one possible implementation, the first target indoor temperature can be set directly. For example, a user can input the parameter value of the first target indoor temperature into a cloud server, and the first instruction is used to indicate that the lowest indoor temperature of the environment where the terminal equipment connected to the chiller is located in the first time period is the first target indoor temperature.

[0121] In another possible implementation, the first target indoor temperature can be predicted. As an example, a user can input multiple first indoor temperatures into a cloud server. Using the controlled variable method, while keeping the chiller's advance cooling time and outlet water temperature constant, the power cost for each of the multiple first indoor temperatures is calculated, and the first indoor temperature with the lowest power cost is determined as the first target indoor temperature. Each of these multiple first indoor temperatures is lower than the preset target indoor temperature.

[0122] In other words, the first target indoor temperature is one of a plurality of first indoor temperatures, and in the first period, the electricity cost when the environment of the terminal equipment connected to the chiller is the first target indoor temperature is lower than the electricity cost when the environment is any one of the plurality of first indoor temperatures other than the first target indoor temperature.

[0123] For example, assuming the preset target indoor temperature is 26℃, and multiple first outlet water temperatures are 24.4℃, 24.2℃, 24℃, 23.8℃, and 23.6℃, ​​then, while keeping the chiller's advance cooling time and outlet water temperature constant, calculate the electricity cost for each of the multiple first indoor temperatures. If the chiller has the lowest electricity cost when the indoor temperature in the first time period is 24℃, then the first target indoor temperature is determined to be 24℃.

[0124] In this embodiment, the cloud server sends a third instruction to the chiller group control system, and the chiller group control system can receive the third instruction. After receiving the third instruction, the chiller group control system can set the first target indoor temperature of the environment where the terminal devices connected to the chiller are located in the first time period based on the third instruction.

[0125] In this method, when the outlet water temperature of the chiller is the preset target outlet water temperature, the indoor temperature of the environment where the terminal equipment connected to the chiller is located can reach the preset target indoor temperature. Therefore, when the chiller lowers the outlet water temperature in the first period, the indoor temperature can be lowered to below the preset target indoor temperature. Thus, lowering the indoor temperature in the first period can improve the utilization rate of the cooling capacity provided by the chiller system.

[0126] Furthermore, when the chiller's outlet water temperature during the first time period is the first target outlet water temperature, the indoor temperature of the environment where the terminal equipment connected to the chiller is located can reach the first target indoor temperature. Therefore, this indoor environment can be set as the first target indoor temperature. Since the first target outlet water temperature is the outlet water temperature with the lowest electricity cost among multiple first outlet water temperatures, and the first target indoor temperature is also the indoor temperature with the lowest electricity cost among multiple first indoor temperatures, this not only improves the utilization rate of the cooling capacity provided by the chiller system, but also allows the chiller system to save more on electricity costs.

[0127] In this embodiment, the second target indoor temperature can be the highest indoor temperature of the environment where the terminal device connected to the chiller is located during the second time period. That is, the indoor temperature of the environment during the second time period can be the second target indoor temperature, or it can be between the second target indoor temperature and the preset target indoor temperature.

[0128] In one possible implementation, the second target indoor temperature can be set directly. For example, a user can input the parameter value of the second target indoor temperature into a cloud server, and the second instruction is used to indicate that the highest indoor temperature in the environment where the terminal equipment connected to the chiller is located during the second time period is the second target indoor temperature.

[0129] In another possible implementation, the second target indoor temperature can be predicted. As an example, a user can input multiple second indoor temperatures into a cloud server. Using the controlled variable method, while keeping the chiller's advance cooling time and outlet water temperature constant, the power cost for each of the multiple second indoor temperatures is calculated, and the second indoor temperature with the lowest power cost is determined as the second target indoor temperature. Each of these multiple second indoor temperatures is higher than the preset target outlet water temperature.

[0130] In other words, the second target indoor temperature can be one of multiple second indoor temperatures, and in the second period, the electricity cost of the chiller when it is the second target indoor temperature is lower than the electricity cost of the chiller when it is any one of the multiple second indoor temperatures other than the second target indoor temperature.

[0131] For example, assuming the preset target indoor temperature is 26℃, and multiple second outlet water temperatures are 27.6℃, 27.8℃, 28℃, 28.2℃, and 28.4℃, then, while keeping the chiller's advance cooling time and outlet water temperature constant, calculate the electricity cost for each of the multiple second indoor temperatures. If the electricity cost is lowest when the environment where the terminal equipment connected to the chiller is located is 28℃ in the second time period, then the second target indoor temperature is determined to be 28℃.

[0132] In this embodiment, the cloud server sends a fourth instruction to the chiller group control system, and the chiller group control system can receive the fourth instruction. After receiving the fourth instruction, the chiller group control system can set the second target indoor temperature of the environment where the terminal devices connected to the chiller are located in the second time period based on the fourth instruction.

[0133] In this method, the environment where the terminal equipment connected to the chiller is located is controlled by a cloud server and a chiller group control system to ensure that the indoor temperature in the second period is higher than the preset target indoor temperature. Since the indoor temperature in the second period is higher than the preset target indoor temperature, the cooling capacity required to reach the indoor temperature in the second period is less than the cooling capacity required to reach the preset target indoor temperature. This allows the chiller system to obtain less cooling capacity in the second period, thus saving the chiller system's electricity costs in the second period.

[0134] In some possible implementations, the method may further include: the cloud server sending a fifth instruction to the chiller group control system, the fifth instruction being used to indicate the third target outlet water temperature of the chiller in the third time period, the third target outlet water temperature being equal to the preset target outlet water temperature, the third time period being after the second time period.

[0135] In this embodiment, the third time period being after the second time period means that the start time of the third time period is after the end time of the second time period, or the start time of the third time period is equal to the end time of the second time period.

[0136] In this method, the start time of the third time period can be the moment when the extra cooling capacity provided by the chiller system in the first time period is exactly equal to the less cooling capacity provided by the chiller system in the second time period. Setting the outlet water temperature of the chiller in the third time period to the preset target outlet water temperature can prevent the chiller system from providing insufficient cooling capacity in the third time period due to the outlet water temperature of the chiller in the third time period still being higher than the preset target outlet water temperature, thus preventing the terminal equipment from obtaining the required temperature.

[0137] Figure 4 This is a schematic diagram illustrating a first time period, a second time period, and a third time period according to an embodiment of this application. In this embodiment, it is assumed that the target time period is from 8:00 AM to 12:00 PM. The start time of the first time period is 7:30 AM, the end time of the first time period and the start time of the second time period are both 8:00 AM, and the end time of the second time period and the start time of the third time period are both 8:30 AM.

[0138] In this example, the duration of the first time period is equal to the duration of the second time period, and the first difference between the first target outlet water temperature and the preset target outlet water temperature is equal to the second difference between the second target outlet water temperature and the preset target outlet water temperature.

[0139] In some possible implementations, the method may further include: the cloud server sending a sixth instruction to the chiller group control system, the sixth instruction indicating the third target indoor temperature of the environment in the third time period, the third target indoor temperature being equal to the preset target indoor temperature.

[0140] In this method, the indoor temperature of the environment where the terminal equipment connected to the chiller is located in the third period is set to the preset target indoor temperature. This can avoid the problem that the cooling capacity provided by the chiller system in the third period exceeds the cooling capacity required by the indoor temperature in the third period when the outlet water temperature of the chiller drops to the preset target outlet water temperature in the third period but the indoor temperature in the third period is still higher than the preset target indoor temperature. This improves the utilization rate of the cooling capacity provided by the chiller system in the third period.

[0141] Figure 5This diagram illustrates the outlet water temperatures of a chiller system provided in one embodiment of this application during the first, second, and third time periods. In this embodiment, it is assumed that the first time period begins at 7:30 AM, the first time period ends at 8:00 AM, and the second time period begins at 8:00 AM. The end time of the second time period and the start time of the third time period are both 8:30 AM. The chiller's first target outlet water temperature during the first time period is 5°C, the chiller's second target outlet water temperature during the second time period is 9°C, and the chiller's third target outlet water temperature during the third time period is 7°C.

[0142] In this example, the duration of the first time period is equal to the duration of the second time period, the preset target outlet water temperature of the chiller is 7°C, and the first difference between the first target outlet water temperature and the preset target outlet water temperature is equal to the second difference between the second target outlet water temperature and the preset target outlet water temperature.

[0143] Figure 6 This diagram illustrates the indoor temperatures for a first, second, and third time period, as provided in one embodiment of this application. In this embodiment, it is assumed that the first time period begins at 7:30 AM, the first time period ends at 8:00 AM, and the second time period begins at 8:00 AM. The environment in which the terminal equipment connected to the chiller is located has a first target indoor temperature of 24°C during the first time period, a second target indoor temperature of 28°C during the second time period, and a third target indoor temperature of 26°C during the third time period.

[0144] In this example, the duration of the first time period is equal to the duration of the second time period, the preset target indoor temperature of the environment where the terminal equipment connected to the chiller is located is 26°C, and the difference between the first target indoor temperature and the preset target indoor temperature is equal to the difference between the second target indoor temperature and the preset target indoor temperature.

[0145] In some possible implementations, the method may further include: the cloud server sending a seventh instruction to the chiller group control system, the seventh instruction being used to instruct the chiller to start cooling at a target time, the target time being no later than the start time of the first time period.

[0146] In this embodiment, the target time not later than the start time of the first time period means that the target time is equal to the start time of the first time period or is located before the start time of the first time period.

[0147] In this method, the cloud server sends a seventh instruction to the chiller group control system. Accordingly, after receiving the seventh instruction, the chiller group control system can control the chiller to start cooling at the target time, so that the chiller is in the on or running state at the beginning of the first time period.

[0148] Optionally, the chiller can also receive a power-on command from the user at or before the target time, and the chiller will start cooling after receiving the power-on command from the user.

[0149] Optionally, the chiller group control system can collect the cooling load data of the chiller system in the first, second and third time periods, and send the collected cooling load data to the cloud server.

[0150] Figure 7 This is a schematic diagram illustrating the cooling load of a chiller system provided in one embodiment of this application during a first, second, and third time period. In this embodiment, it is assumed that the first time period begins at 7:30 AM, the first time period ends at 8:00 AM, and the second time period begins at 8:00 AM. It is also assumed that the chiller's first target outlet water temperature is 5°C during the first time period, 9°C during the second time period, and 7°C during the third time period. Furthermore, it is assumed that the environment where the chiller is connected to has a first target indoor temperature of 24°C during the first time period, a second target indoor temperature of 28°C during the second time period, and a third target indoor temperature of 26°C during the third time period.

[0151] In this example, the chiller system experiences higher cooling load during the first time period, and this load tends to increase initially and then decrease. The chiller system experiences lower cooling load during the first and second time periods, and the cooling load in both the second and third time periods tends to stabilize. The method in this application can shift some of the load from the target time period with higher electricity prices to the first time period with lower electricity prices, thereby saving on the chiller system's electricity costs.

[0152] Figure 8 This is a schematic diagram of the control device for a refrigeration system provided in one embodiment of this application. Figure 8 As shown, the control device 800 of the refrigeration system includes an acquisition module 801 and a transmission module 802.

[0153] As an example, the control unit 800 of the refrigeration system can be used to implement... Figure 2 The control method of the illustrated embodiment. The acquisition module 801 can be used to execute S201, and the sending module 802 can be used to execute S202 and S203.

[0154] Figure 9 A schematic diagram of the control device for a refrigeration system provided in another embodiment of this application. (See diagram below.) Figure 9As shown, the control device 900 of the chiller system includes a processor 901 and an interface circuit 902. The processor 901 and the interface circuit 902 are coupled to each other. It is understood that the interface circuit 902 can be a transceiver or an input / output interface. Optionally, the control device 900 of the chiller system may also include a memory 903 for storing instructions executed by the processor 901, or storing input data required by the processor 901 to execute instructions, or storing data generated after the processor 901 executes instructions.

[0155] As an example, the interface circuit 902 is used to implement the functions of the acquisition module 801 and the transmission module 802 described above.

[0156] It is understood that the processor in the embodiments of this application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. A general-purpose processor may be a microprocessor or any conventional processor.

[0157] The method steps in the embodiments of this application can be implemented in hardware or by a processor executing software instructions. The software instructions can consist of corresponding software modules, which can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disks, portable hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can reside in an ASIC. Additionally, the ASIC can reside in a network device or terminal device. Alternatively, the processor and storage medium can exist as discrete components in the network device or terminal device.

[0158] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of this application are performed entirely or partially. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user equipment, or other programmable device. The computer program or instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions can be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; it can also be an optical medium, such as a digital video optical disc; or it can be a semiconductor medium, such as a solid-state drive.

[0159] In the various embodiments of this application, unless otherwise specified or logically conflicting, the terminology and / or descriptions between different embodiments are consistent and can be referenced mutually. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships. The term "multiple" in this document refers to two or more. The term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the preceding and following related objects; in formulas, the character " / " indicates a "division" relationship between the preceding and following related objects.

[0160] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application.

[0161] It is understood that, in the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

Claims

1. A control method for a refrigeration system, characterized in that, The chiller system includes a cloud server, a chiller group control system, and chillers. The method includes: The cloud server obtains the preset target outlet water temperature of the chiller during the target time period. The working time of the chiller includes the target time period, and the electricity price during the target time period is higher than the preset electricity price. The cloud server sends a first instruction to the chiller group control system. The first instruction is used to indicate the first target outlet water temperature of the chiller in a first time period. The first target outlet water temperature is lower than the preset target outlet water temperature. The first time period is earlier than the target time period. The cloud server sends a second instruction to the chiller group control system. The second instruction is used to indicate the second target outlet water temperature of the chiller in a second time period. The second target outlet water temperature is higher than the preset target outlet water temperature. The second time period is after the first time period, and the start time of the second time period is not later than the start time of the target time period. The duration of the second time period is shorter than the target time period. The cloud server sends a third instruction to the chiller group control system. The third instruction is used to indicate the first target indoor temperature of the environment where the terminal device connected to the chiller is located during the first time period. The first target indoor temperature is lower than the preset target indoor temperature of the environment during the target time period. The cloud server sends a fourth instruction to the chiller group control system. The fourth instruction is used to indicate the second target indoor temperature of the environment in the second time period, which is higher than the preset target indoor temperature.

2. The method according to claim 1, characterized in that, The duration of the first time period is equal to the duration of the second time period, and the first difference between the first target outlet water temperature and the preset target outlet water temperature is equal to the second difference between the second target outlet water temperature and the preset target outlet water temperature.

3. The method according to claim 1 or 2, characterized in that, The method further includes: The cloud server sends a fifth instruction to the chiller group control system. The fifth instruction is used to indicate the third target outlet water temperature of the chiller in the third time period. The third target outlet water temperature is equal to the preset target outlet water temperature. The third time period is after the second time period.

4. The method according to claim 3, characterized in that, The method further includes: The cloud server sends a sixth instruction to the chiller group control system. The sixth instruction is used to indicate the third target indoor temperature of the environment in the third time period. The third target indoor temperature is equal to the preset target indoor temperature.

5. The method according to claim 4, characterized in that, The first target outlet water temperature is one of a plurality of first outlet water temperatures, and during the first time period, the power cost of the chiller when it is the first target outlet water temperature is lower than the power cost of the chiller when it is any one of the plurality of first outlet water temperatures other than the first target outlet water temperature. The second target outlet water temperature is one of a plurality of second outlet water temperatures, and during the second time period, the electricity cost of the chiller when it is at the second target outlet water temperature is lower than the electricity cost of the chiller when it is at any of the plurality of second outlet water temperatures other than the second target outlet water temperature; The first target indoor temperature is one of a plurality of first indoor temperatures, and during the first time period, the electricity cost when the environment is the first target indoor temperature is lower than the electricity cost when the environment is any one of the plurality of first indoor temperatures other than the first target indoor temperature; The second target indoor temperature is one of a plurality of second indoor temperatures, and during the second time period, the electricity cost when the environment is the second target indoor temperature is lower than the electricity cost when the environment is any one of the plurality of second indoor temperatures other than the second target indoor temperature.

6. The method according to any one of claims 1 to 5, characterized in that, The method further includes: The cloud server sends a seventh instruction to the chiller group control system, the seventh instruction being used to instruct the chiller to start cooling at a target time, the target time being no later than the start time of the first time period.

7. A control device for a refrigeration system, characterized in that, Includes functional modules for implementing the method as described in any one of claims 1 to 6.

8. A control device for a refrigeration system, characterized in that, Memory and processor; The memory is used to store program instructions; The processor is used to execute program instructions in the memory to implement the method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores program code for computer execution, the program code including instructions for implementing the method as claimed in any one of claims 1 to 6.

10. A computer program product, characterized in that, It includes a computer program that, when executed by a processor, implements the method as described in any one of claims 1 to 6.

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