Self-adaptive control method and system for refrigerating unit based on digital twinning

Abstract

The invention discloses a self-adaptive control method and system for a refrigerating unit based on digital twinning, and relates to the technical field of refrigerating instrument control. The control method comprises the steps that current operation parameters of a refrigerating unit system are obtained, and target operation parameters of the refrigerating unit system are determined; and according to the current operation power of the compressor and the target operation power of the compressor, the target pressure value of the medium in the cooling loop after the power of the compressor is adjusted is determined, the pressure transmission duration is determined according to the target pressure value and the current pressure value, and the opening degree adjusting moment of the expansion valve is determined according to the pressure transmission duration and the compressor power adjusting moment. According to the arrangement, the expansion valve can be prevented from being adjusted too early or too late, the expansion valve and the compressor are correspondingly arranged, when pressure is conducted to the expansion valve, the opening degree of the expansion valve can be correspondingly adjusted, excessive instantaneous pressure caused by mismatching of the expansion valve and the compressor is eliminated, the service life of a refrigerating unit system is prolonged, and the using effect of the refrigerating unit system is improved.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration equipment control technology, and in particular to a refrigeration unit adaptive control method and system based on digital twins. Background Art

[0002] In the prior art, during the process of adjusting the refrigeration power of the refrigeration system, it is generally necessary to synchronously adjust the speed of the refrigeration system compressor and the opening of the refrigeration system expansion valve to reduce the heat load change during the compressor speed adjustment process and improve the stability of the system.

[0003] However, existing refrigeration systems often experience fluctuations in superheat and heat load, which can lead to overshoot and hinder adaptive control of the refrigeration system. Furthermore, these fluctuations can lead to unstable cooling performance and reduce the lifespan and performance of the refrigeration system. Summary of the Invention

[0004] In view of the shortcomings of the above-mentioned related technologies, the present application provides a refrigeration unit adaptive control method and system based on digital twins to at least partially solve the above-mentioned technical problems.

[0005] In the first aspect, the present application provides a refrigeration unit adaptive control method based on digital twin, which is used for a refrigeration unit system. The refrigeration unit system includes a cooling circuit, a compressor and an expansion valve arranged on the cooling circuit, and the cooling circuit is filled with a medium. The control method includes: obtaining the current operating parameters of the refrigeration unit system, the operating parameters of the refrigeration unit system include the current pressure value of the medium in the cooling circuit and the current operating power of the compressor, determining the target operating parameters of the refrigeration unit system, the target operating parameters of the refrigeration unit system include the target operating power of the compressor, determining the target pressure value of the medium in the cooling circuit after the compressor power is adjusted according to the current operating power of the compressor and the target operating power of the compressor, determining the pressure transfer time according to the target pressure value and the current pressure value, the pressure transfer time is the time required for the target pressure to be transferred from the compressor to the expansion valve, determining the opening adjustment time of the expansion valve according to the pressure transfer time and the compressor power adjustment time, and adjusting the opening of the expansion valve according to the opening adjustment time of the expansion valve.

[0006] In a second aspect, the present application provides a refrigeration unit system, which has a cooling circuit filled with a medium. The refrigeration unit system includes a compressor and an expansion valve, which are arranged on the cooling circuit. The refrigeration unit system includes an acquisition module, an operation module, a power module, a pressure module, an opening module and an adjustment module. The acquisition module is used to obtain the current operating parameters of the refrigeration unit system. The operating parameters of the refrigeration unit system include the current pressure value of the medium in the cooling circuit and the current operating power of the compressor. The operation module is used to determine the target operating parameters of the refrigeration unit system. The target operating parameters of the refrigeration unit system include the target operating power of the compressor. The power module is used to determine the target pressure value of the medium in the cooling circuit after the compressor power is adjusted based on the current operating power of the compressor and the target operating power of the compressor. The pressure module is used to determine the pressure transmission time based on the target pressure value and the current pressure value. The pressure transmission time is the time required for the target pressure to be transmitted from the expansion valve to the compressor. The opening module is used to determine the opening adjustment time of the expansion valve based on the pressure transmission time and the compressor power adjustment time. The adjustment module is used to adjust the opening of the expansion valve according to the opening adjustment time of the expansion valve.

[0007] In a third aspect, the present application provides an electronic device comprising a memory and a processor, wherein the memory stores programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, the steps of the aforementioned digital twin-based adaptive control method for refrigeration units are implemented.

[0008] In a fourth aspect, the present application provides a readable storage medium on which a program or instruction is stored. When the program or instruction is executed by a processor, the aforementioned adaptive control method of a refrigeration unit based on digital twins is implemented.

[0009] The technical solution adopted by the present invention can achieve the following beneficial effects: the target pressure value and the current pressure value of the medium in the cooling circuit are determined by the current pressure value of the medium in the cooling circuit and the current operating power of the compressor. The pressure transmission time is determined according to the target pressure value and the current pressure value. The pressure transmission time is the time required for the target pressure to be transmitted from the compressor to the expansion valve. The opening adjustment time of the expansion valve is determined according to the pressure transmission time and the compressor power adjustment time. The opening of the expansion valve is adjusted according to the expansion valve opening adjustment time. This can reduce problems such as superheat and heat load fluctuation caused by pressure conduction, that is, the setting can avoid adjusting the expansion valve too early or too late, so that the expansion valve and the compressor are set correspondingly. When the pressure is transmitted to the expansion valve, the opening of the expansion valve can be adjusted accordingly, eliminating the instantaneous excessive pressure caused by the mismatch between the two, and improving the service life and use effect of the refrigeration unit system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 is a schematic diagram of temperature change of a medium shown in an exemplary embodiment of the present application; Figure 2 is a structural diagram of a refrigeration unit system shown in an exemplary embodiment of the present application; Figure 3 1 is a flow chart of a refrigeration unit adaptive control method based on digital twins according to an exemplary embodiment of the present application; Figure 4 is a flow chart illustrating a method of determining a pressure transmission duration based on a target pressure value and a current pressure value, according to an exemplary embodiment of the present application; Figure 5 is a flow chart of another control method shown in an exemplary embodiment of the present application; Figure 6 is a schematic diagram of a power variation curve of a compressor shown in an exemplary embodiment of the present application; Figure 7 is a schematic diagram of an expansion valve opening variation curve shown in an exemplary embodiment of the present application; Figure 8 is a schematic diagram of a flow chart of determining target operating parameters of a refrigeration unit system according to an exemplary embodiment of the present application; Figure 9 is a module diagram of a refrigeration unit system shown in an exemplary embodiment of the present application; Figure 10 It is a structural diagram of an electronic device shown in an exemplary embodiment of the present application.

[0012] In the figure: 1. Refrigeration unit system; 100. Cooling circuit; 110. Compressor; 120. Expansion valve; 130. Heat exchanger; 140. Condenser; 150. Buffer tank; 160. High-pressure and high-temperature pipeline; 170. Low-pressure and low-temperature pipeline; 200. Refrigeration circuit; 310. Acquisition module; 320. Operation module; 330. Power module; 340. Pressure module; 350. Opening module; 360. Adjustment module; 400. Electronic equipment; 410. Memory; 420. Processor. DETAILED DESCRIPTION

[0013] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0014] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0015] However, in the related art, because the refrigeration system has problems such as superheat and heat load oscillation, it will easily cause overshoot, which is not conducive to the adaptive control of the refrigeration system. Furthermore, due to changes in implementation scenarios or needs, it is necessary to change the power of the compressor and the opening of the expansion valve at the same time to make the compressor in the best operating state. For example, when the ambient temperature rises, it is necessary to increase the speed of the compressor to increase the refrigeration efficiency of the refrigeration system. As the speed of the compressor increases, the medium pressure at the compressor changes. There are also pipelines and / or other components between the compressor and the expansion valve, and it takes a certain amount of time for the changes on both sides of the compressor to be transmitted to the expansion valve. In the related art, the compressor power and the expansion valve opening are adjusted synchronously, that is, when the pressure changes at both ends of the compressor have not been transmitted to the expansion valve, the opening of the expansion valve has changed. In other words, if Figure 1 As shown, Figure 1 The temperature change diagram of the medium at the expansion valve is shown in the figure. The horizontal axis is time in minutes (min), and the vertical axis is temperature in degrees Celsius. Before the pressure change at both ends of the compressor is transmitted to the expansion valve, the increase in the expansion valve opening will cause the flow rate of the expansion valve to increase, and the pressure on both sides of the expansion valve to decrease, which in turn causes the temperature of the low-temperature and low-pressure medium output from the expansion valve to increase. In other words, this will cause the superheat of the refrigeration system to decrease, resulting in a decrease in the refrigeration efficiency of the refrigeration system in a short period of time, which in turn causes the superheat and heat load of the refrigeration system to oscillate, as shown in the figure below. Figure 1 The temperature value of the expansion valve is unstable. Oscillation and overshoot may lead to unstable cooling effect of the refrigeration system, which may also reduce the service life and performance of the refrigeration system.

[0016] The first aspect of this embodiment provides a detailed description of the adaptive control method for a refrigeration unit based on digital twins, which is referred to as the control method below.

[0017] The control method of the embodiment of the present application is used for a refrigeration unit system 1, such as Figure 2 As shown, the refrigeration unit system 1 may include a cooling circuit 100, a compressor 110, and an expansion valve 120. The compressor 110 and the expansion valve 120 are disposed on the cooling circuit 100. The expansion valve 120 may be an electronic expansion valve, etc. The cooling circuit 100 is filled with a medium, which may be a refrigerant such as Freon, but is not limited thereto. The refrigeration unit system 1 may also include a heat exchanger 130 and a condenser 140. The heat exchanger 130 and the condenser 140 are both disposed on the cooling circuit 100.

[0018] It is understandable that the refrigeration unit system 1 can be applied to data centers, food cold storages, chemical condensation devices, etc., and the application scope and implementation objects of the refrigeration unit system 1 are not limited.

[0019] Furthermore, the compressor 110, the condenser 140, the expansion valve 120 and the heat exchanger 130 are arranged in sequence, and the medium can flow along the compressor 110, the condenser 140, the expansion valve 120 and the heat exchanger 130 in sequence. The compressor 110 can be turned on, and the compressor 110 compresses the low-pressure gaseous medium returned from the heat exchanger 130, greatly increasing its pressure and temperature, thereby converting the low-temperature and low-pressure gaseous medium into a high-temperature and high-pressure gaseous medium. The expansion valve 120 is installed on the cooling circuit 100. When the high-temperature and high-pressure liquid medium flows out of the condenser 140, it passes through the expansion valve 120. By controlling the opening of the expansion valve 120, the high-pressure liquid medium is rapidly depressurized and expanded here, and is converted from a liquid state to a gas-liquid mixed state. In addition, the pipeline can also be provided with various components such as a buffer tank 150, a stop valve, a one-way valve, a filter, etc., which are not limited here.

[0020] In one embodiment, the refrigeration unit system 1 may further include a refrigeration circuit 200, and the refrigeration circuit 200 and the cooling circuit 100 can exchange heat with each other through a heat exchange device. The refrigeration circuit 200 is used to cool the target temperature control object or its environment to reduce the temperature of the target temperature control object or its environment. For example, the refrigeration circuit 200 is provided with components such as an evaporator, which can provide cooling for the target temperature control object or its environment. Conversely, the heat absorbed by the refrigeration circuit 200 can be transferred to the medium of the cooling circuit 100 through devices such as a heat exchanger, and the medium can dissipate heat through the condenser 140. Among them, the target temperature control object can be equipment inside a data center, fruits and vegetables in a cold storage, etc., and the environment of the target temperature control object is a cold storage or a data center, etc., which is not limited here.

[0021] Figure 3 FIG. 1 shows a flow chart of the control method of this embodiment. Figure 3 As shown, the control method of this embodiment includes the following steps: Step S100: obtaining current operating parameters of the refrigeration unit system, where the operating parameters of the refrigeration unit system include the current pressure value of the medium in the cooling circuit and the current operating power of the compressor.

[0022] Obtain the current operating parameters of the refrigeration system. The current operating parameters can reflect the current working status of the refrigeration system, including but not limited to the current pressure value of the medium in the cooling circuit and the current operating power of the compressor.

[0023] Furthermore, the cooling circuit may be equipped with a sensor, such as a pressure sensor, capable of acquiring information about the current pressure of the cooling circuit medium. For example, during the high-pressure phase of the refrigeration cycle, when the compressor compresses the gaseous medium and pumps it into the cooling circuit, the medium pressure increases. The pressure sensor converts this pressure change signal into a corresponding electrical signal, which can be transmitted to the control module of the refrigeration system.

[0024] It is understood that the number of sensors can be multiple, such as two, three, or even more, without limitation. Multiple sensors can be located in various areas of the cooling circuit, such as at the compressor, expansion valve, heat exchanger, and expansion valve, without limitation. Each sensor can detect the medium pressure value in the corresponding area to detect subtle changes in the medium pressure within the cooling circuit.

[0025] The compressor can be equipped with a detection device, such as a power meter, that can detect the compressor's current operating power. As the ambient temperature rises, cooling demand increases, and the compressor must increase its speed to compress more refrigerant, increasing its operating current and the current operating power. As the refrigerated space temperature approaches the set point, cooling demand decreases, and the compressor's current operating power decreases accordingly, leading to a decrease in speed. By continuously monitoring the compressor's current operating power through the detection device, operators can assess the compressor's operating efficiency and determine whether its status complies with the set program.

[0026] Step S200: determining target operating parameters of the refrigeration unit system, where the target operating parameters of the refrigeration unit system include target operating power of the compressor.

[0027] Determine target operating parameters for the refrigeration system. These target operating parameters include, but are not limited to, the target operating power of the compressor. It is understood that these target operating parameters may include operating parameters of the condenser, compressor, heat exchanger, and expansion valve, such as the target operating opening of the expansion valve and the target operating power of the compressor, without limitation. These target operating parameters may be directly input by the user, recorded, or calculated using a pre-set program, without limitation.

[0028] For example, if a refrigeration system can be used to cool a cold storage, users can know the type and quantity of target temperature-controlled objects in the cold storage, as well as their temperature sensitivity. Different target temperature-controlled objects have different characteristics such as heat capacity and respiration, and their cooling capacity requirements are also very different. Furthermore, the cold storage stores fresh fruits and vegetables. Since fresh fruits and vegetables continue to respire and generate heat, the refrigeration system will maintain the cold storage at a continuously lower temperature environment. This means that the compressor needs to provide sufficient cooling capacity, and the corresponding target operating power is higher.

[0029] Step S300: determining a target pressure value of the medium in the cooling circuit after the compressor power is adjusted according to the current operating power of the compressor and the target operating power of the compressor.

[0030] Based on the compressor's current operating power and target operating power, it's understood that under certain conditions, the compressor's operating power is directly proportional to the refrigeration system's cooling capacity. When the compressor's operating power increases, the amount of medium compressed per unit time increases, transferring more energy to the medium, raising the medium's pressure and increasing the refrigeration system's cooling capacity. When the compressor's operating power decreases, the medium's pressure decreases, reducing the refrigeration system's cooling capacity.

[0031] Based on historical data from various refrigeration systems, we generate curves and mathematical models that correlate the current compressor power and the cooling capacity of the refrigeration system. These models are constructed based on extensive historical data and theoretical analysis. By substituting the target and current compressor power as input parameters, we can derive the corresponding target pressure for the cooling circuit medium.

[0032] In some other cases, when the opening of the expansion valve is adjusted without adjusting the power of the compressor, the target opening and current opening of the expansion valve can also be converted to obtain the target pressure value of the medium in the cooling circuit. Alternatively, when the expansion valve and the compressor are adjusted at the same time, the target pressure value of the medium in the cooling circuit can be obtained by comprehensive calculation through the target opening and current opening of the expansion valve, the current operating power of the compressor and the target operating power of the compressor, etc., which will not be elaborated here.

[0033] In some other embodiments, the target pressure value of the medium in the cooling circuit can be calculated by the user based on historical data, etc., and directly input into the refrigeration unit system.

[0034] Step S400: determining a pressure transfer time according to a target pressure value and a current pressure value. The pressure transfer time is the time required for the target pressure to be transferred from the compressor to the expansion valve.

[0035] In the prior art, adjusting the expansion valve too early or too late will cause the instantaneous pressure of the cooling circuit to be too high or too low, which will lead to instability of the refrigeration unit system. In the embodiment of the present application, after determining the target pressure value of the medium in the cooling circuit and obtaining the current pressure value in real time through the pressure sensor, the pressure transmission time can be calculated. Compared with the expansion valve, the compressor can be adjusted first in the refrigeration cycle, and the compressor gives priority to the change in the medium pressure in the cooling circuit. Therefore, the expansion valve can adjust its own opening according to the pressure change transmitted from the compressor, which can ensure stable coordination between the expansion valve and the compressor, and the refrigeration effect of the refrigeration unit system is stable.

[0036] The pressure transmission time is affected by the length of the pipe, the size of the pipe diameter, the viscosity of the medium and the various resistance elements in the system. In one case of the present application, based on the historical data of the refrigeration unit system, the relationship between the pressure transmission time, the target pressure value and the current pressure value is converted, and then the target pressure value and the current pressure value are substituted to obtain the pressure transmission time. Among them, the historical data can be the operating data of the refrigeration unit system during formal operation, trial operation or experiment, etc. In some other cases, engineers will construct a pressure transmission model based on the detailed design parameters of the cooling circuit, such as the piping design of the cooling circuit, combined with the principles of fluid mechanics. And through automatic calculation, the pressure transmission time for the pressure to propagate in the cooling circuit can be obtained.

[0037] Furthermore, various components in the pipeline, such as stop valves, check valves, and filters, can cause localized pressure loss, altering the pressure transmission characteristics. Based on historical data, this pressure loss can be compensated for, thereby minimizing its impact and ensuring accurate pressure transmission duration.

[0038] Step S500: determining the expansion valve opening adjustment time according to the pressure transmission time and the compressor power adjustment time.

[0039] After calculating the pressure transmission time, combined with the compressor power adjustment time, the expansion valve opening adjustment time can be determined. The compressor power adjustment time is the time point when adjustments are made based on the refrigeration demand and the current operating status of the compressor. For example, the compressor performs power adjustment at time T1, and the calculated pressure transmission time is t, and then the expansion valve opening adjustment time T2 is equal to T1 plus t. This is because only when the target pressure generated by the compressor power adjustment is transmitted to the expansion valve, the expansion valve synchronously matches the time difference of the pressure transmission to adjust the opening to maintain the balance of the cooling circuit. Through this time matching setting, it can ensure that the expansion valve opening adjustment and the compressor power adjustment are coordinated with each other, avoiding oscillations and other situations due to improper adjustment timing, and even causing the refrigeration unit system performance to decline.

[0040] Step S600: adjusting the opening of the expansion valve according to the opening adjustment time of the expansion valve.

[0041] The expansion valve opening is adjusted according to the expansion valve opening adjustment time. After determining the expansion valve opening adjustment time, the expansion valve opening can be adjusted accordingly. For example, in a refrigeration system, the expansion valve opening adjustment can be performed by a driver. At the set opening adjustment time, a control signal is sent to the expansion valve driver. The expansion valve driver can be an electric actuator, a pneumatic actuator, or other similar devices, without limitation. After receiving the control signal, the driver adjusts the expansion valve opening according to the preset setting. For example, when cooling demand increases, compressor power is increased, and the target pressure value increases. At the corresponding opening adjustment time, pressure is transmitted to the expansion valve, controlling the expansion valve to open wider, allowing more high-pressure liquid medium to flow into the heat exchanger for evaporation and heat absorption to meet cooling demand. This setting ensures accurate opening of the expansion valve, ensuring that it opens neither too early nor too late, thereby improving stability.

[0042] The technical solution adopted by the present invention can achieve the following beneficial effects: the target pressure value and the current pressure value of the medium in the cooling circuit are determined by the current pressure value of the medium in the cooling circuit and the current operating power of the compressor. The pressure transmission time is determined according to the target pressure value and the current pressure value. The pressure transmission time is the time required for the target pressure to be transmitted from the compressor to the expansion valve. The opening adjustment time of the expansion valve is determined according to the pressure transmission time and the compressor power adjustment time. The opening of the expansion valve is adjusted according to the expansion valve opening adjustment time. This can reduce problems such as superheat and heat load fluctuation caused by pressure conduction, that is, the setting can avoid adjusting the expansion valve too early or too late, so that the expansion valve and the compressor are set correspondingly. When the pressure is transmitted to the expansion valve, the opening of the expansion valve can be adjusted accordingly, eliminating the instantaneous excessive pressure caused by the mismatch between the two, and improving the service life and use effect of the refrigeration unit system.

[0043] According to an alternative embodiment, please refer to Figure 2 The cooling circuit 1 may include a high-pressure, high-temperature pipeline 160 and a low-pressure, low-temperature pipeline 170. The medium in the high-pressure, high-temperature pipeline 160 absorbs heat, so the pressure and temperature of the medium are high. Furthermore, the compressor 110 compresses the low-pressure gaseous medium returned from the heat exchanger 130, significantly increasing its pressure and temperature, thereby converting the low-temperature, low-pressure gaseous medium into a high-temperature, high-pressure gaseous medium. Therefore, the temperature and pressure of the high-pressure, high-temperature pipeline 160 are lower. In the low-pressure, low-temperature pipeline 170, by controlling the opening of the expansion valve 120, the high-pressure liquid medium is rapidly depressurized and expanded here, converting from a liquid state to a gas-liquid mixed state. Therefore, the temperature and pressure of the low-pressure, low-temperature pipeline 170 are lower.

[0044] The target pressure value of the medium in the cooling circuit 1 may include a first pressure value and a second pressure value, where the first pressure value is the target pressure value of the medium in the high-pressure and high-temperature pipeline 160, and the second pressure value is the target pressure value of the medium in the low-pressure and low-temperature pipeline 170. The current pressure value of the medium in the cooling circuit 1 may include a third pressure value and a fourth pressure value, where the third pressure value is the current pressure value of the medium in the high-pressure and high-temperature pipeline 160, and the fourth pressure value is the current pressure value of the medium in the low-pressure and low-temperature pipeline 170.

[0045] See also Figure 4 Step S400: Determine the pressure transmission duration according to the target pressure value and the current pressure value, including: Step S410: determining a first transfer time according to the first pressure value and the third pressure value, where the first transfer time is the time required for the target pressure to pass through the high-pressure and high-temperature pipeline and be transferred from the compressor to the expansion valve.

[0046] A first transfer time is determined based on the first and third pressure values. The first transfer time is the time it takes for the target pressure of the medium to be transferred from the compressor to the expansion valve along the high-pressure, high-temperature pipeline. Based on historical data of the high-pressure, high-temperature pipeline of the refrigeration unit system, the relationship between the pressure transfer time, the target pressure value, and the current pressure value of the high-pressure, high-temperature pipeline is converted. The first and third pressure values ​​are then substituted into this relationship to obtain the first transfer time of the high-pressure, high-temperature pipeline. The historical data may include operating data from the official operation or trial operation of the refrigeration unit system.

[0047] Furthermore, the length, diameter, and distribution of the high-pressure, high-temperature pipeline all affect pressure transmission. For example, a thinner diameter increases the flow resistance of the medium, reduces the flow rate, and thus slows the pressure transmission rate. Based on the principles of fluid mechanics and historical data of the refrigeration unit system, a specialized pressure transmission model was constructed based on the detailed design drawings and actual operating parameters of the high-pressure, high-temperature pipeline. The first and third pressure values ​​were used as input data to determine the first transmission time for the target pressure to be transmitted from the compressor to the expansion valve in the high-pressure, high-temperature pipeline.

[0048] Step S420: determining a second transfer time according to the second pressure value and the fourth pressure value, where the second transfer time is the time required for the target pressure to pass through the low-pressure and low-temperature pipeline and be transferred from the compressor to the expansion valve.

[0049] The second transfer time is determined based on the second pressure value and the fourth pressure value. The second transfer time is the time it takes for the target pressure of the medium to be transferred from the compressor to the expansion valve along the low-pressure and low-temperature pipeline. Based on the historical data of the low-pressure and low-temperature pipeline of the refrigeration unit system, the relationship between the pressure transfer time, the target pressure value, and the current pressure value of the low-pressure and low-temperature pipeline is converted, and then the second transfer time of the low-pressure and low-temperature pipeline is obtained by substituting the second pressure value and the fourth pressure value into the relationship. The historical data can be operating data during the formal operation or trial operation of the refrigeration unit system, etc.

[0050] Furthermore, the length, diameter, and distribution of the low-pressure, low-temperature pipeline all affect pressure transmission. For example, a thinner pipe diameter increases the flow resistance of the medium, reduces the flow rate, and thus slows the pressure transmission rate. Based on the principles of fluid mechanics and historical data of refrigeration unit systems, a specialized pressure transmission model was constructed based on the detailed design drawings and actual operating parameters of the low-pressure, low-temperature pipeline. The first and third pressure values ​​were used as input data to determine the second transmission time for the target pressure to be transmitted from the expansion valve to the compressor in the low-pressure, low-temperature pipeline.

[0051] It is understandable that the medium can circulate in the low-pressure, low-temperature pipeline and the high-pressure, high-temperature pipeline. In this embodiment, the pressure of the medium at the compressor changes due to changes in the power of the compressor. Relative to the compressor, the medium's pressure changes as it flows from the low-pressure, low-temperature pipeline to the compressor and then from the compressor to the high-pressure, high-temperature pipeline. This will cause the medium to generate negative pressure in the low-pressure, low-temperature pipeline, while also generating positive pressure in the high-pressure, high-temperature pipeline. Both positive and negative pressures will be transmitted to the expansion valve. Therefore, unlike the high-pressure, high-temperature pipeline, the second transmission time can be the time it takes to transmit the negative pressure in the low-pressure, low-temperature pipeline.

[0052] Step S430: The pressure transmission duration is configured as a first transmission duration.

[0053] The first transfer time is the medium transfer time in the high-pressure and high-temperature pipeline, and the second transfer time is the medium transfer time in the low-pressure and low-temperature pipeline. The medium has a higher pressure and flows faster in the high-pressure and high-temperature pipeline. When pressure changes in the cooling circuit, the medium pressure in the high-pressure and high-temperature pipeline has a larger vibration amplitude than that in the low-pressure and low-temperature pipeline, which will have a greater impact on the service life and use effect of the refrigeration unit system. Therefore, the pressure transfer time is configured as the first transfer time, and the expansion valve is adjusted according to the pressure transfer time. This can at least partially eliminate the impact of the medium pressure on the high-pressure and high-temperature pipeline, avoid excessive instantaneous pressure fluctuations that damage the refrigeration unit system, and improve the service life and use effect of the refrigeration unit system.

[0054] According to an alternative embodiment, please refer to Figure 2 The low-pressure and low-temperature pipeline 170 may be provided with a buffer tank 150, which can be used to regulate the pressure of the medium within the low-pressure and low-temperature pipeline 170. The buffer tank 150 utilizes its internal space to store and buffer the refrigerant flowing in the cooling circuit 100. Furthermore, when the medium flow rate or pressure of the cooling circuit 100 fluctuates, the buffer tank 150 can temporarily store excess medium. Alternatively, when the medium flow rate of the cooling circuit 100 is insufficient, the buffer tank 150 can promptly replenish the medium, thereby stabilizing the pressure and flow rate.

[0055] Step S400: Determine the pressure transmission duration according to the target pressure value and the current pressure value, further comprising: Step S440: When the first transfer duration is not equal to the second transfer duration, adjust the medium pressure in the buffer tank. After adjusting the buffer tank, the time it takes for the second pressure value to be transferred from the compressor to the expansion valve is the fifth transfer duration, so that the fifth transfer duration is equal to the first transfer duration.

[0056] In the prior art, due to the differences between the high-pressure and high-temperature pipeline and the low-pressure and low-temperature pipeline in terms of structure, medium state and flow characteristics, the first transmission time may not be equal to the second transmission time. In the embodiment of the present application, by changing the medium pressure in the buffer tank, the second transmission time of the pressure in the low-pressure and low-temperature pipeline can be effectively adjusted. Adjust the pressure regulating valve of the buffer tank, thereby changing the medium pressure in the buffer tank, and then changing the medium pressure in the low-pressure and low-temperature pipeline. The medium pressure of the low-pressure and low-temperature pipeline changes, which will change the propagation speed of the medium pressure in the low-pressure and low-temperature pipeline, and adjust the time for the second pressure value to be transmitted from the compressor to the expansion valve to the fifth transmission time.

[0057] For example, when the medium pressure in the tank increases, the medium in the low-pressure, low-temperature pipeline also increases, increasing the propagation speed of the medium pressure in the low-pressure, low-temperature pipeline, so as to adjust the time for the second pressure value to be transmitted from the compressor to the expansion valve to the fifth transmission time, that is, adjusting the second transmission time to the fifth transmission time. This will make the fifth transmission time equal to the first transmission time, so that the medium transmission time in the low-pressure, low-temperature pipeline and the high-pressure, high-temperature pipeline is the same, that is, the fifth transmission time is equal to the first transmission time. This can simultaneously ensure the stable operation of the low-pressure, low-temperature pipeline and the high-pressure, high-temperature pipeline, eliminate the impact of medium pressure changes on the low-pressure, low-temperature pipeline and the high-pressure, high-temperature pipeline, and improve the service life and performance of the refrigeration unit system.

[0058] According to an alternative embodiment, see Figure 5 , the control method of the embodiment of the present application may further include: Step S700: Determine the power change curve of the compressor according to the current operating power of the compressor and the target operating power of the compressor. The absolute value of the slope of the tangent of the power change curve of the compressor gradually increases from zero and then gradually decreases to zero as the adjustment time increases.

[0059] The power variation curve of the compressor is determined according to the current operating power of the compressor and the target operating power of the compressor. The power variation curve of the compressor reflects the power of the compressor at different operating moments. Figure 6 A schematic diagram of a power variation curve of a compressor is shown, wherein the horizontal axis is usually time, the unit of which may be minutes (min), and the vertical axis is the power of the compressor, the unit of which may be watts (W).

[0060] like Figure 6 As shown, the absolute value of the slope of the tangent of the power change curve of the compressor gradually decreases to zero as the adjustment time gradually increases from zero. Furthermore, after the compressor starts to be adjusted, the power of the compressor begins to change, and the absolute value of the tangent slope of the power change curve gradually increases, that is, the power change of the compressor per unit time continues to increase. This is because in the initial stage of adjustment, in order to narrow the gap between the current operating power and the target operating power as quickly as possible, according to the setting of gradually increasing the absolute value of the tangent slope of the power change curve, the adjustment speed of the compressor can be gradually increased to speed up the rate of change of the compressor power. For example, by gradually increasing the adjustment speed of the power supply frequency of the compressor motor, the speed of the compressor motor is rapidly increased. At this time, the absolute value of the tangent slope of the power change curve increases, thereby improving the response speed.

[0061] When the adjustment time continues to increase and the compressor power gradually approaches the target operating power, in order to avoid excessive power adjustment and drastic power changes, the compressor is ensured to smoothly reach the target operating power and operate stably. In this embodiment, the absolute value of the tangent slope of the power change curve gradually decreases, that is, the power change of the compressor per unit time continues to decrease. For example, when the compressor power approaches the target power, the adjustment rate of the compressor power supply frequency becomes smaller, the compressor speed changes tend to be flat, the power change rate decreases, and the absolute value of the tangent slope of the power change curve decreases accordingly. The curve gradually becomes flat until the slope is 0, at which point the compressor power is at the target power and tends to be stable.

[0062] It is understandable that the current operating power of the compressor can be greater than or less than the target operating power of the compressor. Therefore, the power of the compressor can be increased or decreased, and whether it increases or decreases, it can be adjusted according to the power change curve. In other words, the tangent slope of the power change curve can be positive or negative. Regardless of whether it is positive or negative, the absolute value of the tangent slope of the power change curve first increases and then decreases until it reaches 0. This will allow the compressor to stabilize at the beginning and end of the adjustment period, increase the service life of the compressor, avoid over-adjustment of the compressor, and rapidly change the compressor power in the intermediate period, thereby improving the response speed.

[0063] Step S800: adjusting the power of the compressor according to the power variation curve of the compressor.

[0064] The power of the compressor is adjusted according to the power change curve in which the absolute value of the tangent slope gradually increases from zero and then gradually decreases to zero as the adjustment time increases. In the early stage of the power adjustment of the compressor, the adjustment speed of the compressor per unit time can be gradually increased according to the gradual increase in the absolute value of the tangent slope of the power change curve, so as to speed up the rate of change of the compressor power. When the compressor power approaches the target value, the adjustment speed of the compressor per unit time is gradually reduced. For example, as the adjustment rate of the power supply frequency gradually decreases, the absolute value of the tangent slope of the power change curve decreases accordingly, and the change in the compressor speed gradually tends to be gentle until the slope is 0, at which time the power of the compressor tends to be stable. This will allow the compressor to be stable at the beginning and end of the adjustment period, thereby increasing the service life of the compressor, avoiding over-adjustment of the compressor, and rapid changes in the intermediate period, thereby improving the response speed.

[0065] According to an optional embodiment, the operating parameters of the refrigeration unit system further include the current opening value of the expansion valve, the target operating parameters of the refrigeration unit system further include the target opening value of the expansion valve, and the control method further includes: Step S900: Determine the expansion valve opening change curve according to the compressor power change curve, the current opening value of the expansion valve and the target opening value of the expansion valve. The change trend of the expansion valve opening change curve corresponds to the change trend of the compressor power change curve.

[0066] The current opening value of the expansion valve and the target opening value of the expansion valve can determine the amplitude and range of the expansion valve opening change. The change trend of the expansion valve opening change curve is then determined by the compressor power change curve. In other words, the change trend of the expansion valve opening change curve corresponds to the change trend of the compressor power change curve. Figure 7 The schematic diagram of the expansion valve opening change curve is shown, where the horizontal axis is usually time, the unit can be minutes (min), and the vertical axis is the expansion valve opening value, the unit can be percentage (%). Figure 7 As shown, the absolute value of the slope of the tangent to the expansion valve opening variation curve gradually decreases from zero to zero as the adjustment time increases. This allows the expansion valve to stabilize at the beginning and end of the adjustment period, extending the service life of the expansion valve, preventing over-adjustment of the expansion valve and rapid changes in the expansion valve opening during the intermediate period, thereby improving response speed.

[0067] Since the expansion valve opening changes correspond to changes in compressor power to maintain pressure balance and efficient cooling in the refrigeration system, the trend of the expansion valve opening curve should correspond to the trend of the compressor power curve. Because the compressor power changes according to the power curve, the corresponding pressure is transmitted to the expansion valve after a transmission time. The expansion valve opening can be adjusted according to the corresponding opening curve. This can at least partially eliminate the impact of pressure changes and avoid instability caused by misalignment between the expansion valve and the compressor.

[0068] According to an alternative embodiment, see Figure 8 Step S200: Determine target operating parameters of the refrigeration unit system, including: Step S210: Acquire operating data of the target temperature-adjusting object, where the operating data includes the target temperature and current temperature of the target temperature-adjusting object.

[0069] Obtaining operating data for the target thermostat. This operating data includes, but is not limited to, the target temperature, current temperature, minimum heat output, and maximum heat output of the target thermostat. This operating data can be obtained, but is not limited to, manual input by an operator or conversion of historical data. This operating data can subsequently be used to determine the required cooling capacity of the target thermostat, and, based on this required cooling capacity, determine the requirements of the refrigeration system.

[0070] Step S220: Acquire environmental data, where the environmental data includes the ambient temperature of the refrigeration unit system and the target temperature control object.

[0071] Obtain environmental data. Environmental data may also include the temperature of the refrigeration unit system and its environment, as well as the temperature of the target temperature control object and its environment, without limitation. The acquisition method may be that the refrigeration unit system has a sensor, and the sensor monitors the refrigeration unit system's own temperature and environmental data in real time. For example, the sensor detects the temperature of the condenser of the refrigeration unit system and the environment in which the condenser is located, which will affect the heat discharge efficiency of the refrigeration unit system. Alternatively, the refrigeration unit system can directly obtain the local weather forecast, or the user manually inputs the environmental data into the refrigeration unit system, and the type of environmental data and the acquisition method are not limited.

[0072] Step S230: determining target operating parameters of the refrigeration unit system according to the operating data and environmental data of the target temperature adjustment object.

[0073] By combining the operating data and environmental data of the target temperature control object to determine the target operating parameters of the refrigeration unit system, the target operating parameters of the refrigeration unit system can be adjusted accurately according to the needs of the target temperature control object while eliminating the influence of environmental factors. For example, the operating data of the target temperature control object includes the current temperature and the target temperature. Based on the current temperature and the target temperature of the target temperature control object, the required cooling capacity of the target temperature control object can be determined. The environmental data includes the change in the ambient temperature, etc., and the target operating parameters of the refrigeration unit system are comprehensively obtained by combining the change, eliminating the interference of environmental factors on the target temperature control object and the refrigeration unit system. For example, under the premise that the operating data of the target temperature control object is stable, the ambient temperature may be as high as 35°C or even higher during the hot summer period, while the ambient temperature may drop to below 0°C during the cold winter season. Therefore, the embodiments of the present application can eliminate the influence of these factors, enabling the refrigeration unit system to adjust its operating status in real time according to actual operating conditions, efficiently and accurately meeting the cooling needs of the target temperature control object in different scenarios, while achieving energy conservation and consumption reduction, and extending the service life of the equipment.

[0074] Moreover, as the operating time continues to increase, historical data continues to increase, and the target operating parameters can be continuously optimized. Subsequent target operating parameters can be determined as optimal target operating parameters. The judgment of the optimal target operating parameters can be based on the fluctuation range of the ambient temperature of the target temperature-controlled object and its storage area and the feedback of the operator. The operator can also directly set or select the corresponding optimal target operating parameters under a certain environmental parameter. In some other cases, the user can modify the target operating parameters according to the ambient temperature, that is, the user compares the ambient temperature with historical data, and the historical data assists the user in making judgments, which will not be elaborated here.

[0075] According to an optional embodiment, the control method further includes: Step S240: acquiring historical operating data of the target temperature-adjusting object, where the historical operating data of the target temperature-adjusting object includes a heat generation rate curve of the target temperature-adjusting object.

[0076] Obtain historical data of the target thermostat. Historical data includes, but is not limited to, the heat generation rate curve of the target thermostat, the ambient temperature of the environment, the operating time, and the type of the target thermostat. The historical data of the target thermostat can be obtained by directly obtaining the data of the target thermostat in the corresponding database, or obtaining the data of the target thermostat of the same model online. In addition, in the subsequent operation of the target thermostat, the daily operation data will also be synchronously uploaded to the corresponding database for subsequent use, which will also facilitate subsequent tracing and optimization of the target operation parameters.

[0077] As shown in the figure, in the heat production rate curve of the target temperature control object, the horizontal axis is, the unit is, and the vertical axis is, the unit is. The heat production rate curve of the target temperature control object can show the relationship between the heat production rate and time. In addition, the pattern in the heat production rate curve is obtained. For example, when the heat production efficiency of a certain period of the heat production rate curve fluctuates, the target temperature control object in the subsequent period is likely to quickly generate a large amount of heat.

[0078] Step S250: Determine the compressor power adjustment time according to the heat production rate curve of the target temperature adjustment object.

[0079] In existing technologies, the target regulated object may generate heat rapidly, resulting in low cooling efficiency of the refrigeration system. This in turn causes the target regulated object's temperature to rise, which in turn affects the target regulated object's operating efficiency or storage life. For example, at a certain time during the day, data center traffic may surge and fluctuate continuously. The refrigeration system may temporarily run out of cooling capacity, affecting the target regulated object's operating efficiency or storage life.

[0080] In an embodiment of the present application, the compressor power adjustment time is determined based on the heat production rate curve of the target temperature control object. It is understood that when the slope of the heat production rate curve meets a certain threshold, the heat production efficiency of the target temperature control object is too high, and the cooling capacity of the refrigeration unit system cannot reduce the target temperature control object. The heat production rate curve is used to predict the possibility of large-scale heat production by the target temperature control object in the future, so that the refrigeration unit system can generate cooling capacity in advance. This advance setting can eliminate the time difference between the cold energy transfer to the target temperature control object, so that the cold energy is transferred to the target temperature control object in a timely manner, thereby preventing the target temperature control object from being too high at a certain time. Furthermore, if the slope of the curve at a subsequent moment in the heat production rate curve of the target temperature control object exceeds the threshold, the current moment is determined to be the compressor power adjustment time, and the compressor power can be adjusted. This can be predicted in advance by the heat production rate curve, eliminating the time difference between the cold energy transfer to the target temperature control object, so that the temperature of the target temperature control object is constant.

[0081] Furthermore, through long-term monitoring and analysis of the refrigeration system's historical operating data, the system can tailor cooling operations to specific time periods. For example, if historical data indicates that online traffic to the data center increases during a specific time period each day, and the heat generated by the data center also increases during this time, the refrigeration system can automatically increase its cooling efficiency before that time period, thereby increasing the amount of cooling delivered to the target temperature-controlled object. This enables the refrigeration system to have predictive capabilities, allowing it to proactively adapt to different emergency situations.

[0082] The second aspect of this embodiment describes the refrigeration unit system 1 in detail. Please refer to Figure 2 The refrigeration unit system 1 has a cooling circuit 100 filled with a medium. The refrigeration unit system 1 includes a compressor 110 and an expansion valve 120. The compressor 110, the expansion valve 120 and the buffer tank 150 are arranged on the cooling circuit 100. Figure 9 , Figure 9 The module diagram of the refrigeration unit system 1 of this embodiment is shown. The refrigeration unit system 1 includes an acquisition module 310, an operation module 320, a power module 330, a pressure module 340, an opening module 350 and an adjustment module 360.

[0083] Furthermore, the acquisition module 310 is used to obtain the current operating parameters of the refrigeration unit system 1, which include the current pressure value of the medium in the cooling circuit 100 and the current operating power of the compressor 110. The operation module 320 is used to determine the target operating parameters of the refrigeration unit system 1, which include the target operating power of the compressor 110. The power module 330 is used to determine the target pressure value of the medium in the cooling circuit 100 after the power of the compressor 110 is adjusted based on the current operating power of the compressor 110 and the target operating power of the compressor 110. The pressure module 340 is used to determine the pressure transmission time based on the target pressure value and the current pressure value. The pressure transmission time is the time required for the target pressure to be transmitted from the expansion valve 120 to the compressor 110. The opening module 350 is used to determine the opening adjustment time of the expansion valve 120 based on the pressure transmission time and the power adjustment time of the compressor 110. The adjustment module 360 ​​is used to adjust the opening of the expansion valve 120 according to the opening adjustment time of the expansion valve 120.

[0084] In another embodiment, the refrigeration unit system 1 further includes a buffer tank 150 . The buffer tank 150 is disposed on the cooling circuit 100 and is used to adjust the medium pressure in the cooling circuit 100 . Details thereof will not be repeated here.

[0085] The third aspect of this embodiment provides a detailed description of the readable storage medium.

[0086] The readable storage medium of this embodiment stores a program or instruction. When executed by a processor, the program or instruction implements the steps of the adaptive control method for a refrigeration unit based on a digital twin, as described in any of the technical solutions of this embodiment. The implementation of each of the above operations can be found in the previous method embodiments and will not be repeated here.

[0087] The readable storage medium may be an electronic memory such as a flash memory, an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a hard disk, or a ROM. Alternatively, the readable storage medium may include a non-transitory computer-readable storage medium. The computer-readable storage medium has storage space for program code for executing any of the method steps described above. This computer program code can be read from or written to one or more computer program products. The computer program code may be compressed, for example, in a suitable form.

[0088] The fourth aspect of this embodiment provides a detailed description of the electronic device 400 .

[0089] This embodiment can also provide an electronic device 400, such as Figure 10 As shown, the system includes a memory 410 and a processor 420, which are connected to each other. The memory 410 stores programs or instructions that can be executed on the processor 420. When the programs or instructions are executed by the processor 420, the steps of the adaptive control method for a refrigeration unit based on digital twins are implemented, such as any technical solution in this embodiment. The memory 410 can exist independently or be integrated with the processor 420.

[0090] Memory 410 may include random access memory (RAM) or read-only memory (ROM). Memory 410 may be used to store instructions, programs, code, code sets, or instruction sets. Memory 410 may include a program storage area and a data storage area. The program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playback function, an image playback function, etc.), and instructions for implementing each of the aforementioned method embodiments. The data storage area may also store data generated by the electronic device 400 during use (such as audio and video data, chat history data, etc.).

[0091] The processor 420 may include one or more processing cores. The processor 420 can connect various components within the electronic device 400 using various interfaces and circuits. It can execute instructions, programs, code sets, or instruction sets stored in the memory 410 and access data stored in the memory 410 to perform various functions and process data within the electronic device 400. Optionally, the processor 420 can be implemented in hardware using at least one of a digital signal processing (DSP), a field programmable gate array (FPGA), and a programmable logic array (PLA). The processor 420 may integrate one or a combination of a central processing unit (CPU), a graphics processing unit (GPU), and a modem. The CPU primarily processes the operating system, user interface, and application programs; the GPU is responsible for rendering and drawing display content; and the modem handles wireless communications. It is understood that the modem may also be implemented independently of the processor 420 via a separate communications chip.

[0092] When the program or instructions stored in memory 410 are executed, processor 420 may be configured to perform various operations in the aforementioned method embodiments to implement the steps of the adaptive control method for a refrigeration unit based on a digital twin, such as any of the technical solutions in this embodiment. The specific implementation of these operations can be found in the aforementioned method embodiments and will not be further described here.

[0093] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0094] Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in reverse order depending on the functions involved. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to certain examples may be combined in other examples.

[0095] The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A refrigeration unit adaptive control method based on digital twin, used in a refrigeration unit system, characterized in that: The refrigeration unit system includes a cooling circuit, a compressor and an expansion valve arranged on the cooling circuit, the cooling circuit is filled with a medium, and the control method includes: Acquiring current operating parameters of the refrigeration unit system, wherein the operating parameters of the refrigeration unit system include a current pressure value of the medium in the cooling circuit and a current operating power of the compressor; Determining target operating parameters of the refrigeration unit system, wherein the target operating parameters of the refrigeration unit system include a target operating power of the compressor; determining a target pressure value of the medium in the cooling circuit after the compressor power is adjusted according to the current operating power of the compressor and the target operating power of the compressor; Determine a pressure transfer time according to the target pressure value and the current pressure value, wherein the pressure transfer time is the time required for the target pressure to be transferred from the compressor to the expansion valve; determining the opening adjustment time of the expansion valve according to the pressure transmission time and the compressor power adjustment time; The opening of the expansion valve is adjusted according to the opening adjustment time of the expansion valve.

2. The control method according to claim 1, characterized in that: The cooling circuit includes a high-pressure, high-temperature pipeline and a low-pressure, low-temperature pipeline. The target pressure value of the medium in the cooling circuit includes a first pressure value and a second pressure value, the first pressure value being the target pressure value of the medium in the high-pressure, high-temperature pipeline, and the second pressure value being the target pressure value of the medium in the low-pressure, low-temperature pipeline. The current pressure value of the medium in the cooling circuit includes a third pressure value and a fourth pressure value, the third pressure value being the current pressure value of the medium in the high-pressure, high-temperature pipeline, and the fourth pressure value being the current pressure value of the medium in the low-pressure, low-temperature pipeline. Determining the pressure transmission time according to the target pressure value and the current pressure value includes: determining a first transfer time according to the first pressure value and the third pressure value, wherein the first transfer time is the time required for the target pressure to pass through the high-pressure and high-temperature pipeline and be transferred from the compressor to the expansion valve; determining a second transfer time according to the second pressure value and the fourth pressure value, wherein the second transfer time is the time required for the target pressure to pass through the low-pressure and low-temperature pipeline and be transferred from the compressor to the expansion valve; The pressure transmission duration is configured as the first transmission duration.

3. The control method according to claim 2, characterized in that: The low-pressure and low-temperature pipeline is provided with a buffer tank, which can be used to adjust the pressure of the medium in the low-pressure and low-temperature pipeline. The pressure transmission time is determined according to the target pressure value and the current pressure value, and further includes: When the first transfer duration is not equal to the second transfer duration, the medium pressure in the buffer tank is adjusted. After the buffer tank is adjusted, the time it takes for the second pressure value to be transferred from the compressor to the expansion valve is the fifth transfer duration, so that the fifth transfer duration is equal to the first transfer duration.

4. The control method according to claim 1, wherein: The control method further includes: determining a power variation curve of the compressor according to the current operating power of the compressor and the target operating power of the compressor, wherein the absolute value of the slope of a tangent line of the power variation curve of the compressor gradually increases from zero and then gradually decreases to zero as the adjustment time increases; The power of the compressor is adjusted according to the power variation curve of the compressor.

5. The control method according to claim 4, characterized in that: The operating parameters of the refrigeration unit system further include a current opening value of the expansion valve, the target operating parameters of the refrigeration unit system further include a target opening value of the expansion valve, and the control method further includes: The opening change curve of the expansion valve is determined based on the power change curve of the compressor, the current opening value of the expansion valve and the target opening value of the expansion valve. The changing trend of the opening change curve of the expansion valve corresponds to the changing trend of the power change curve of the compressor.

6. The control method according to claim 1, characterized in that: Determining the target operating parameters of the refrigeration unit system includes: Acquiring operating data of a target temperature-adjusting object, wherein the operating data includes a target temperature and a current temperature of the target temperature-adjusting object; Acquiring environmental data, the environmental data including the ambient temperature of the environment in which the refrigeration unit system and the target temperature control object are located; The target operating parameters of the refrigeration unit system are determined according to the operating data of the target temperature adjustment object and the environmental data.

7. The control method according to claim 6, characterized in that: The control method further includes: Acquiring historical operating data of the target temperature adjustment object, wherein the historical operating data of the target temperature adjustment object includes a heat generation rate curve of the target temperature adjustment object; The power adjustment time of the compressor is determined according to the heat generation rate curve of the target temperature adjustment object.

8. A refrigeration unit system, characterized in that: The refrigeration unit system has a cooling circuit filled with a medium, the refrigeration unit system includes a compressor and an expansion valve, the compressor and the expansion valve are arranged on the cooling circuit, and the refrigeration unit system includes: an acquisition module, configured to acquire current operating parameters of the refrigeration unit system, wherein the operating parameters of the refrigeration unit system include a current pressure value of the medium in the cooling circuit and a current operating power of the compressor; An operation module, configured to determine target operating parameters of the refrigeration unit system, wherein the target operating parameters of the refrigeration unit system include a target operating power of the compressor; a power module, configured to determine a target pressure value of the medium in the cooling circuit after the compressor power is adjusted according to the current operating power of the compressor and the target operating power of the compressor; a pressure module, configured to determine a pressure transmission time according to the target pressure value and the current pressure value, wherein the pressure transmission time is a time required for the target pressure to be transmitted from the expansion valve to the compressor; an opening module, configured to determine an opening adjustment time of the expansion valve according to the pressure transmission time and the compressor power adjustment time; The regulating module is used to regulate the opening of the expansion valve according to the opening regulation time of the expansion valve.

9. An electronic device, characterized in that: It includes a memory and a processor, the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the adaptive control method of a refrigeration unit based on digital twins are implemented.

10. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the adaptive control method of the refrigeration unit based on digital twin according to any one of claims 1 to 7 is implemented.

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