A load matching control method for evaporative cooling magnetic levitation phase change air conditioner

Abstract

The present application relates to magnetic levitation phase change air conditioning technical field, especially to a kind of load matching control method for evaporative cooling magnetic levitation phase change air conditioner, the method is by obtaining outdoor wet bulb temperature and system refrigeration load, compared with preset threshold to start different working mode;By the actual temperature under different working mode and temperature threshold comparison judges whether the refrigeration output matches the demand;If not match, then according to the temperature difference calculation initial adjustment amount of key components;Real-time sampling key component current, calculate mutation rate and compare with threshold, according to the comparison result to initial adjustment amount is modified, to complete the regulation of each component.The present application realizes the multi-dimensional fusion and self-adaptive matching of load demand, environmental conditions and equipment state, improves the energy efficiency of system, and effectively avoids the operation risk caused by adjusting too fast or equipment abnormality.

Description

Technical Field

[0001] This invention relates to the field of magnetic levitation phase change air conditioning technology, and in particular to a load matching control method for evaporative cooling magnetic levitation phase change air conditioning. Background Technology

[0002] The field of energy-saving and control technology for air conditioning systems covers multiple areas such as compressor frequency conversion regulation, advanced cycle design and intelligent energy management. Its core objective is to optimize the synergistic cooperation of energy flow and information flow within the system to achieve precise matching between cooling capacity supply and dynamic heat load demand of the building, thereby maximizing system energy efficiency while ensuring environmental comfort.

[0003] Chinese Patent Publication No. CN109812949B discloses a load control method, device, and air conditioner for a multi-compressor unit. The related technical solution includes real-time monitoring of the condenser cooling water outlet temperature and indoor return air temperature. Under the premise of ensuring that the cooling water temperature is within a safe range, the method dynamically decides whether to load or unload the number of compressors by combining the difference between the return air temperature and the set target temperature and its rate of change. However, it mainly controls the number of operating compressors based on the difference between the cooling water temperature, return air temperature, and the set target temperature and its rate of change, without comprehensively considering the real-time energy efficiency of the compressors. This results in uneven load on the compressors, thus failing to maximize the overall energy efficiency of the system.

[0004] Therefore, there is an urgent need for a feedback control method that can sense real-time process characteristics and construct a robust feedback control loop to improve the system's adaptability to different loads and environments. Summary of the Invention

[0005] Therefore, the present invention provides a load matching control method for evaporative cooling magnetic levitation phase change air conditioners to solve the problem in the prior art that causes uneven load on the compressor, thus failing to maximize the overall energy efficiency of the system.

[0006] To achieve the above objectives, the present invention provides a load matching control method for an evaporative cooling magnetic levitation phase change air conditioner, comprising:

[0007] Obtain the outdoor wet-bulb temperature and the system cooling load value;

[0008] Based on the comparison between the outdoor wet-bulb temperature and the preset outdoor wet-bulb temperature, and based on the comparison between the system cooling load value and the preset system cooling load value, different operating modes are determined to be activated. The operating modes include cooling mode, refrigeration mode, cold storage mode, and cold release mode.

[0009] Based on the different operating modes, corresponding key temperature thresholds are determined, including cooling water outlet temperature threshold, chilled water outlet temperature threshold, cold storage completion temperature threshold, and cold release supply water temperature threshold.

[0010] Monitor the key operating temperatures corresponding to different operating modes, including the cooling water outlet temperature, the chilled water outlet temperature, the cold storage device temperature, and the cold release device temperature.

[0011] Based on the comparison result between the key operating temperature and the key temperature threshold, it is determined whether the cooling output in the current operating mode matches the cooling demand.

[0012] If it is determined that the cooling output in the current working mode does not match the cooling demand, the initial adjustment amount of one or more key components is determined, wherein the key components include the magnetic levitation compressor, cooling tower fan, chilled water pump and regulating valve in the system pipeline;

[0013] Obtain the current mutation rate of the key component under different operating modes;

[0014] The current mutation threshold corresponding to the key component is determined based on the different working modes, and the initial adjustment amount is corrected based on the comparison result between the current mutation rate and the corresponding current mutation threshold.

[0015] The key components are controlled based on the corrected adjustment amount.

[0016] Furthermore, the process of determining the initial adjustment amounts of one or more key components includes:

[0017] Based on the comparison between the critical temperature difference and the preset critical temperature difference, the initial adjustment amount of the one or more critical components is determined, wherein the critical temperature difference is the absolute value of the difference between the critical operating temperature and the critical temperature threshold.

[0018] Furthermore, the process of correcting the initial adjustment amount includes:

[0019] Based on the comparison results of the current mutation rate being greater than the maximum value among the current mutation thresholds, it is determined to reduce the initial adjustment amount, and the reduction of the initial adjustment amount is positively correlated with the difference between the current mutation rate and the maximum value among the current mutation thresholds.

[0020] Based on the comparison results of the current mutation rate being less than the minimum value among the current mutation thresholds, it is determined to increase the initial adjustment amount, and the increase in the initial adjustment amount is negatively correlated with the difference between the minimum value among the current mutation thresholds and the current mutation rate.

[0021] Furthermore, determining the corresponding key temperature threshold based on different operating modes includes:

[0022] When in the cooling mode, the corresponding key temperature threshold is determined as the cooling water outlet temperature threshold.

[0023] When in the cooling mode, the corresponding key temperature threshold is determined as the chilled water outlet temperature threshold.

[0024] When in the cold storage mode, the corresponding key temperature threshold is determined as the cold storage completion temperature threshold.

[0025] When in the cooling release mode, the corresponding key temperature threshold is determined as the cooling release water supply temperature threshold.

[0026] Furthermore, the process of determining whether the cooling output in the current operating mode matches the cooling demand includes:

[0027] If the critical operating temperature is greater than the critical temperature threshold, it is determined that the cooling output in the current operating mode is insufficient, and a mismatch with the cooling demand is identified.

[0028] If the critical operating temperature is equal to the critical temperature threshold, it is determined that the cooling output in the current operating mode matches the cooling demand.

[0029] If the critical operating temperature is lower than the critical temperature threshold, it is determined that the cooling output in the current operating mode is excessive, and a mismatch with the cooling demand is identified.

[0030] Furthermore, the process of obtaining the current mutation rate of the key component under different operating modes includes:

[0031] Periodically sample the real-time operating current of the key components;

[0032] Calculate the absolute value of the current difference between the current sampling period and the previous sampling period, and then calculate the ratio with the sampling period duration to obtain the current mutation rate.

[0033] Furthermore, the key components that need to be regulated under different operating modes include:

[0034] In the cooling mode, the control objects are the cooling tower fan and the chilled water pump;

[0035] In the cooling mode, the controlled components are the magnetic levitation compressor, the cooling tower fan, and the chilled water pump.

[0036] In the cold storage mode or the cold release mode, the control objects are the magnetic levitation compressor, the cooling tower fan, the chilled water pump, and the regulating valves in the system pipeline.

[0037] Furthermore, the process of obtaining the system cooling load value includes:

[0038] Monitor the chilled water flow rate, chilled water supply temperature, and return water temperature, and calculate the difference between the return water temperature and the chilled water supply temperature to obtain the supply and return water temperature difference;

[0039] The system cooling load value is calculated based on the chilled water flow rate and the supply and return water temperature difference.

[0040] Furthermore, the process of determining the activation of different operating modes includes:

[0041] If the outdoor wet-bulb temperature is lower than the preset outdoor wet-bulb temperature and the system cooling load value is lower than the first preset system cooling load value, the cooling mode is activated.

[0042] If the outdoor wet-bulb temperature is lower than the preset outdoor wet-bulb temperature and the system cooling load value is greater than or equal to the first preset system cooling load value and less than the second preset system cooling load value, or if the outdoor wet-bulb temperature is greater than or equal to the preset outdoor wet-bulb temperature and the system cooling load value is less than the first preset system cooling load value, then the cooling mode is activated.

[0043] If the outdoor wet-bulb temperature is greater than or equal to the preset outdoor wet-bulb temperature, and the system cooling load value is greater than or equal to the first preset system cooling load value, then the cooling release mode is activated.

[0044] If the outdoor wet-bulb temperature is lower than the preset outdoor wet-bulb temperature and the system cooling load value is greater than or equal to the second preset system cooling load value, the cold storage mode is activated.

[0045] Furthermore, the process of determining the activation of different operating modes also includes:

[0046] When the cooling capacity provided by the cooling release mode meets the real-time cooling requirements, the key temperature threshold corresponding to the cooling mode or the refrigeration mode is increased according to the amount of cooling released by the cold storage device per unit time under this mode.

[0047] Compared with existing technologies, the load matching control method for evaporative cooling magnetic levitation phase change air conditioners of the present invention has the following advantages: It intelligently determines the start-up timing of cooling mode, refrigeration mode, cold storage mode, and cold release mode by acquiring outdoor wet-bulb temperature and system cooling load values ​​in real time and comparing them with preset thresholds at multiple levels; it sets and monitors corresponding key temperature thresholds and key operating temperatures under different operating modes, and accurately determines whether the current cooling output matches the terminal cooling demand based on the comparison results; when a mismatch is determined, it generates the initial adjustment amount of key components based on the comparison relationship between the key temperature difference and the preset key temperature difference; simultaneously, it acquires the current mutation rate of key components under different operating modes and compares it with the corresponding current mutation threshold to correct the initial adjustment amount, and finally regulates the corresponding components based on the corrected adjustment amount. This setup achieves dynamic and precise matching between cooling output and terminal demand, significantly improving the system's energy efficiency, response speed, and operational stability under all operating conditions; it also achieves multi-dimensional integration and adaptive matching of load demand, environmental conditions, and equipment status, effectively avoiding operational risks caused by excessively rapid adjustments or equipment malfunctions while improving system energy efficiency.

[0048] Furthermore, this invention determines whether to decrease or increase the initial adjustment amount by comparing the current surge rate with the maximum and minimum values ​​of the current surge threshold, and establishes a positive correlation between the decrease in adjustment amount and the current surge difference, and the increase in adjustment amount and the current surge offset value, respectively. This setup, by introducing a current surge direction discrimination mechanism, achieves dynamic correction of the initial adjustment amount, thereby effectively avoiding equipment surge and overload.

[0049] Furthermore, this invention establishes a one-to-one mapping relationship between four operating modes and four key temperature thresholds, and compares the key operating temperature with the thresholds under each mode to determine the cooling output status. This setup, by setting a dedicated key temperature threshold for each operating mode and establishing a mapping relationship, ensures the uniqueness of the control benchmark and avoids logical conflicts; simultaneously, both insufficient and excessive cooling are considered mismatched states and trigger adjustments, thereby achieving bidirectional optimization of supply and demand deviations.

[0050] Furthermore, this invention constructs five types of mode start-up conditions covering all operating conditions by comparing multiple threshold combinations of outdoor wet-bulb temperature and system cooling load. This setup, utilizing multiple threshold combinations of outdoor wet-bulb temperature and cooling load to determine the five types of mode start-up conditions covering all operating conditions, enables smooth adaptive switching between modes and effectively prevents erroneous mode activation and oscillations caused by single-dimensional determination.

[0051] Furthermore, this invention also dynamically increases the key temperature threshold of the cooling or refrigeration mode based on the amount of cold released per unit time when the demand is met in the cold release mode. This setting, while ensuring reliable cooling supply, significantly improves overall energy efficiency in the cold release mode by dynamically increasing the main unit's set temperature to reduce compressor energy consumption, and by combining this with the tiered utilization of remaining cold energy in the cold storage device. Attached Figure Description

[0052] Figure 1 This is a block diagram of a load matching control method for an evaporative cooling magnetic levitation phase change air conditioner in an embodiment of the present invention.

[0053] Figure 2 This is a schematic flowchart of the load matching control method for an evaporative cooling magnetic levitation phase change air conditioner in an embodiment of the present invention.

[0054] Figure 3 This is a flowchart illustrating the logic of determining whether the cooling output matches the cooling demand based on the comparison between the cooling water outlet temperature and the cooling water outlet temperature threshold in an embodiment of the present invention.

[0055] Figure 4 This is a flowchart illustrating the logic of determining the initial adjustment amount of a key component based on the comparison between the first current mutation rate and the first current mutation threshold in an embodiment of the present invention. Detailed Implementation

[0056] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0057] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0058] It should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] Please see Figure 1 As shown, it is a block diagram of the load matching control method for an evaporative cooling magnetic levitation phase change air conditioner in an embodiment of the present invention.

[0060] This embodiment includes a load calculation module, a mode judgment module, a temperature monitoring module, an adjustment calculation module, an adjustment correction module, and an equipment control execution module.

[0061] The load calculation module is used to monitor the chilled water flow rate and supply and return water temperature in real time, calculate the supply and return water temperature difference and flow rate, and output the system cooling load value in real time, providing the core input for mode judgment.

[0062] The mode judgment module is connected to the load calculation module, which is used to collect wet-bulb temperature in real time through the outdoor environment sensing unit; the load threshold comparison unit compares the real-time cooling load with the preset value; the mode logic decision unit combines the temperature and load comparison results to make decisions and output start commands for different working modes.

[0063] The temperature monitoring module is connected to the mode judgment module, which is used to monitor the corresponding key operating temperature according to the current mode and compare it with the temperature threshold in real time.

[0064] The adjustment calculation module is connected to the temperature monitoring module. It is used to receive the judgment signal and calculate the difference between the key temperature and the threshold. Based on the comparison between the difference and the preset difference, the initial adjustment of each key component is calculated.

[0065] The adjustment and correction module is connected to the adjustment amount calculation module and the equipment control execution module respectively. It is used to periodically collect component current, calculate the current mutation rate, compare it with the current mutation threshold of each mode, dynamically correct the initial adjustment amount, and generate the final adjustment amount command to resist the impact.

[0066] The equipment control execution module is connected to the adjustment correction module, which is used to receive the final adjustment command and convert it into equipment control signal.

[0067] Please see Figure 2 The diagram shown is a flow chart of a load matching control method for an evaporative cooling magnetic levitation phase change air conditioner according to an embodiment of the present invention. The process in this embodiment includes at least the following steps:

[0068] S1: Obtain the outdoor wet-bulb temperature and the system cooling load value;

[0069] Specifically, the outdoor wet-bulb temperature W, chilled water flow rate L, chilled water supply temperature TS, and return water temperature TR are monitored, and the difference between the return water temperature TR and the chilled water supply temperature TS is calculated to obtain the supply and return water temperature difference ΔT, where ΔT = TR - TS.

[0070] The system cooling load value Q is calculated based on the chilled water flow rate L, the supply and return water temperature difference ΔT, the water density ρ, and the water specific heat capacity c. The calculation process is Q=ρ×c×L×ΔT.

[0071] Among them, the chilled water flow rate L is the amount of heat transfer carrier, representing the volume of chilled water participating in heat exchange per unit time. The value of L directly reflects the system's transport capacity.

[0072] The supply and return water temperature difference ΔT is the intensity of heat transfer, representing the amount of heat absorbed by a unit mass of chilled water as it flows through the terminal device. The value of ΔT directly reflects the efficiency of the terminal heat exchange process.

[0073] S2: Based on the comparison results of the outdoor wet-bulb temperature and the preset outdoor wet-bulb temperature, and based on the comparison results of the system cooling load value and the preset system cooling load value, different working modes are determined to be started. The working modes include cooling mode, refrigeration mode, cold storage mode and cold release mode.

[0074] Specifically, a preset outdoor wet-bulb temperature W0 and a preset system cooling load value Q0 are set in advance. Based on the comparison between W and W0 and Q and Q0, different working modes are determined to be started.

[0075] In this embodiment, historical operating data collected under stable conditions of chiller unit and cooling tower system parameters are statistically correlated to obtain a sample set, and the upper limit value or a specific quantile (such as the 90th percentile) is taken as the preset outdoor wet-bulb temperature value W0. W0 can be used to determine whether the current outdoor environment is suitable for natural cooling mode. For example, W0 can be set to 14.5℃.

[0076] Furthermore, historical operating data collected under stable system parameters of the chiller unit and cooling tower are statistically correlated to obtain a sample set. The central trend value (e.g., the 50th percentile) is then established as the preset system cooling load value Q0. To more accurately determine the activation of different operating modes, the preset system cooling load value Q0 can be divided into a first preset system cooling load value Q01 and a second preset system cooling load value Q02. For example, Q01 can be set to 200kW and Q02 to 550kW. The process of comparing W with W0 and Q with Q01 and Q02 is as follows:

[0077] If W is less than W0 and Q is less than Q01, it indicates that the current outdoor air wet-bulb temperature is low and the building cooling load is small. At this time, the cooling capacity required at the system terminal is small and the outdoor low temperature conditions are sufficient to fully meet the cooling capacity requirement through the cooling tower and plate heat exchanger (natural cooling loop). Therefore, the cooling mode is determined to start.

[0078] If W is less than W0, and Q is greater than or equal to Q01 and less than Q02, it indicates that the current outdoor wet-bulb temperature is low and the building's cooling load has not yet reached the level that requires the activation of the cold storage device. At this time, natural cooling alone cannot meet the demand, and the chiller unit needs to be activated to supplement or undertake the cooling. Therefore, the cooling mode is determined to be activated.

[0079] If W is greater than or equal to W0 and Q is less than Q01, it indicates that the current outdoor wet-bulb temperature is high and the building's cooling load has not reached the peak value that requires combined cooling. At this time, the ambient air's cooling capacity is insufficient and it cannot effectively cool naturally. Therefore, the chiller unit needs to be started for cooling. Thus, the cooling mode is determined to be activated.

[0080] If W is greater than or equal to W0, and Q is greater than or equal to Q01 and less than Q02, it indicates that the current outdoor wet-bulb temperature is high, and natural cooling capacity cannot be utilized. Simultaneously, the building's cooling load is at a moderate level, not yet reaching the peak range requiring coordinated cooling from a cold storage device. In this case, the cooling tower's heat dissipation efficiency decreases, and the chiller unit must independently handle all cooling demands. Therefore, the cooling mode is activated.

[0081] If W is less than W0 and Q is greater than or equal to Q02, it indicates that the current outdoor wet-bulb temperature is low and the building's cooling load has reached a medium-high level. At this time, the instantaneous cooling capacity and heat transfer efficiency of natural cooling cannot meet the current instantaneous peak load demand. The chiller unit needs to operate while storing cold water. Therefore, the cold water storage mode is activated.

[0082] If W is greater than or equal to W0 and Q is greater than or equal to Q02, it indicates that the current outdoor wet-bulb temperature is high and the building's cooling load is extremely high. At this time, the natural cooling mode is completely ineffective, and the cooling tower's heat dissipation efficiency is also reduced to the minimum. The system enters the peak or super-peak load period, and the chiller unit and the cold storage device need to work together. Therefore, it is determined to start the cold release mode.

[0083] S3: Determine the corresponding key temperature thresholds based on different working modes. The key temperature thresholds include the cooling water outlet temperature threshold, the chilled water outlet temperature threshold, the cold storage completion temperature threshold, and the cold release supply water temperature threshold.

[0084] S4: Monitor the key operating temperatures corresponding to different operating modes, including cooling water outlet temperature U, chilled water outlet temperature X, cold storage device temperature Y, and cold release device temperature Z.

[0085] S5: Determine whether the cooling output in the current working mode matches the cooling demand based on the comparison results between the key operating temperature and the key temperature threshold.

[0086] Please see Figure 3 As shown, it is a flowchart of the logic of determining whether the cooling output matches the cooling demand based on the comparison result between the cooling water outlet temperature and the cooling water outlet temperature threshold in an embodiment of the present invention.

[0087] Specifically, in cooling mode, the magnetic levitation compressor is shut down, and the system provides cooling to the building entirely through a loop consisting of a cooling tower fan, plate heat exchanger, and chilled water pump, utilizing cool air from the natural environment. In this mode, the corresponding key temperature threshold is determined as the cooling water outlet temperature threshold U0. A pre-set cooling water outlet temperature threshold U0 is used, and the cooling water outlet temperature U is compared with the cooling water outlet temperature threshold U0 to determine whether the cooling output in cooling mode matches the cooling demand.

[0088] In this embodiment, historical operating data collected under conditions where the system operates entirely in cooling mode (i.e., natural cooling mode) is statistically correlated to obtain a temperature sample set. The lower limit or a specific quantile (such as the 10th percentile) of this sample set is then established as the preset cooling water outlet temperature threshold value U0. U0 allows setting an optimized temperature target for the cooling water circuit in natural cooling mode that ensures both heat exchange efficiency and energy-saving operation. For example, U0 can be set to 16.0℃. The process of comparing U and U0 is as follows:

[0089] If U is greater than U0, it indicates that the current natural cooling capacity is insufficient or the heat exchange efficiency is not optimal. In this case, the natural cold source is insufficient to bear the load. Therefore, it is determined that the cooling output in the cooling mode is insufficient and that the cooling demand is mismatched.

[0090] If U equals U0, it indicates that the current natural cooling capacity and the system's design cooling requirements in cooling mode have reached a real-time balance. Therefore, it is determined that the cooling output in cooling mode matches the cooling requirements and is in the optimal energy efficiency state under natural cooling mode.

[0091] If U is less than U0, it indicates that the current natural cooling capacity is excessive. At this time, the instantaneous cooling capacity exceeds the optimal energy efficiency point of the system under the current building load. Therefore, it is determined that the cooling output in the cooling mode is excessive and that the cooling demand is mismatched.

[0092] In cooling mode, the magnetic levitation compressor, cooling tower fan, and chilled water pump work together to form a complete mechanical refrigeration cycle to cope with the high building cooling load that natural cold sources cannot meet. In this mode, the corresponding key temperature threshold is determined as the chilled water outlet temperature threshold X0. A chilled water outlet temperature threshold X0 is preset, and the chilled water outlet temperature X is compared with X0 to determine whether the cooling output in cooling mode matches the cooling demand.

[0093] In this embodiment, historical operating data collected under the condition that the system operates entirely in cooling mode (i.e., the chiller unit independently provides cooling) is statistically correlated to obtain a temperature sample set, and the statistical center value (such as the median or average value) is established as the preset chilled water outlet temperature threshold value X0. X0 allows setting an optimized temperature target for the system in chiller-only cooling mode that balances chiller operating efficiency and terminal cooling needs. For example, X0 can be set to 7.0℃. The comparison process between X and X0 is as follows:

[0094] If X is greater than X0, it indicates that the current cooling output capacity of the chiller unit is lower than the demand of the terminal cooling load and cannot cool the chilled water to the set temperature. In this case, it is easy to cause insufficient cooling capacity to the terminal or force the system to deviate from the optimal energy efficiency zone. Therefore, it is determined that the cooling output in the cooling mode is insufficient and the cooling demand is mismatched.

[0095] If X equals X0, it indicates that the cooling output of the host unit and the real-time cooling load demand of the terminal have reached a dynamic balance. Therefore, it is determined that the cooling output in the cooling mode matches the cooling demand and is in a highly efficient and stable state in the mechanical cooling mode.

[0096] If X is less than X0, it indicates that the current cooling output capacity of the chiller unit exceeds the terminal demand. When the chilled water is cooled to a temperature lower than the set temperature, it is easy to cause excessive dehumidification at the terminal or condensation on the equipment. Therefore, it is determined that the cooling output in the cooling mode is excessive and that there is a mismatch with the cooling demand.

[0097] In cold storage mode, the magnetic levitation compressor starts and operates, working in conjunction with the cooling tower fan and chilled water pump to form a refrigeration cycle. Simultaneously, a regulating valve in the pipeline alters the water flow path, transferring the generated cooling energy to a cold storage device (such as a phase change cold storage tank) for storage, ready for use during subsequent high-load periods. In this mode, a critical temperature threshold is defined as the cold storage completion temperature threshold Y0. A pre-set cold storage completion temperature threshold Y0 is used, and the temperature Y of the cold storage device is compared with Y0 to determine whether the cooling output in cold storage mode matches the cooling demand.

[0098] In this embodiment, historical operating data collected under the condition that the system operates entirely in cold storage mode (i.e., the chiller unit simultaneously performs cooling and cold storage in the cold storage device) is statistically correlated to obtain a temperature sample set. The lower limit value or a specific low quantile (such as the 5th or 10th percentile) is established as the preset cold storage completion temperature threshold value Y0. Y0 allows setting an optimized temperature target for the system in cold storage mode, marking the end of the cold storage process and ensuring that the cold storage device reaches its designed capacity. For example, Y0 can be set to 4.0℃. The comparison process between Y and Y0 is as follows:

[0099] If Y is greater than Y0, it indicates that the temperature of the medium in the cold storage device has not yet dropped to the target value, and the cold storage process is still in progress. At this time, the current cooling output (the part used for cold storage) is insufficient to complete the cold storage target, and the system should continue to store the full amount of cold. Therefore, it is determined that the cooling output in the cold storage mode is insufficient and that there is a mismatch with the cooling demand.

[0100] If Y equals Y0, it indicates that the temperature of the cold storage device has reached the target value, the preset capacity of cold energy has been stored, and the cold storage process has ended. Therefore, it is determined that the cooling output in the cold storage mode matches the cooling demand.

[0101] If Y is less than Y0, it indicates that the temperature of the cold storage device is lower than the target temperature. In this case, the main unit has been running for too long or the output is too strong, and the cold storage should be stopped in advance. Therefore, it is determined that the cooling output in the cold storage mode is too large and does not match the cooling demand.

[0102] In the cold release mode, the magnetic levitation compressor operates at a reduced frequency, and the core cold source of the system switches to the cold energy stored in the cold storage device (such as a phase change cold storage tank). The cooling tower fan, chilled water pump, and regulating valves in the system pipeline work together to form a cooling cycle mainly based on releasing the stored cold energy to cope with the building's cooling load, achieve peak shaving and valley filling, or serve as a supplementary cold source for the main unit. In this mode, the corresponding key temperature threshold is determined as the cold release water supply temperature threshold Z0. A cold release water supply temperature threshold Z0 is preset, and the temperature Z of the cold release device is compared with Z0 to determine whether the cooling output in the cold release mode matches the cooling demand.

[0103] In this embodiment, historical operating data collected under the condition that the system operates entirely in cold release mode (i.e., the chiller unit and the cold storage device work together to jointly supply cooling to the terminal) are statistically correlated to obtain a temperature sample set, and the statistical center value (such as the median or average value) is established as the preset cold release water supply temperature threshold Z0. Z0 allows setting a target water supply temperature for the system in the combined cold release mode that can efficiently utilize the low-temperature cold energy stored in the cold storage device while achieving optimized mixing with the cold energy output from the main unit, thereby stably meeting peak load demands. For example, Z0 can be set to 6.5℃. The process of comparing Z and Z0 is as follows:

[0104] If Z is greater than Z0, it indicates that the total amount of cooling released from the cold storage device and the cooling supplemented by the chiller is lower than the amount of cooling required to maintain the system at the optimal set point for combined cooling. In this case, the cold release rate of the cold storage device is insufficient or the cooling supplement of the main unit is insufficient, and the terminal faces cooling pressure. Therefore, it is determined that the cooling output in the cold release mode is insufficient and the cooling demand is mismatched.

[0105] If Z equals Z0, it indicates that the combined cooling output of the cold storage device and the chiller unit has reached a real-time balance with the instantaneous cooling load demand at the terminal. At this time, the system operates in the optimal combined cooling state while meeting the peak load. Therefore, it is determined that the cooling output in the cold release mode matches the cooling demand.

[0106] Furthermore, when the cooling output in the cold release mode matches the cooling demand, the cooling water outlet temperature threshold U0 of the cooling mode and the chilled water outlet temperature threshold X0 of the cooling mode are determined based on the cold release amount A.

[0107] In this embodiment, historical operating data collected under the condition that the system operates entirely in cold release mode (i.e., the chiller unit and the cold storage device work together to jointly supply cooling to the terminal) are statistically correlated to obtain a cold release sample set, and the statistical center value (such as the median or average value) is established as the preset cold release A0. A0 ensures that the cold release target can be stably met during peak load demand in cold release mode. To more accurately determine the increase in U0 and X0, A0 can be divided into a first preset cold release A01 and a second preset cold release A02. For example, A01 = 600kW and A02 = 850kW can be set. The process of determining the adjustment amplitude of U0 and X0 based on the comparison results of the cold release A with A01 and A02 is as follows:

[0108] If A is less than or equal to A01, a first cooling water outlet temperature threshold increase adjustment command is generated and the threshold is increased to 1.25 times the initial value, and a first chilled water outlet temperature threshold increase adjustment command is generated and the threshold is increased to 1.1 times the initial value; wherein, if the cooling water outlet temperature threshold and the chilled water outlet temperature threshold are set to 16℃ and 7.0℃ respectively, the corresponding thresholds after the increase adjustment are 20℃ and 7.7℃ respectively.

[0109] If A is greater than A01 and less than or equal to A03, a second cooling water outlet temperature threshold increase adjustment command is generated and the threshold is increased to 1.3 times the initial value, and a second chilled water outlet temperature threshold increase adjustment command is generated and the threshold is increased to 1.2 times the initial value.

[0110] If A is greater than A02, a third cooling water outlet temperature threshold increase adjustment command is generated and the threshold is increased to 1.5 times the initial value, and a third chilled water outlet temperature threshold increase adjustment command is generated and the threshold is increased to 1.4 times the initial value.

[0111] If Z is less than Z0, it indicates that the total output cooling capacity of the combined cooling system exceeds the current demand. At this time, the cooling capacity is sufficient, but the excessively low supply water temperature can easily lead to excessive dehumidification at the terminal and increase energy consumption. Therefore, it is determined that the cooling output in the release mode is excessive and that the cooling demand is mismatched.

[0112] S6: If it is determined that the cooling output in the current working mode does not match the cooling demand, determine the initial adjustment of one or more key components, including the magnetic levitation compressor, cooling tower fan, chilled water pump and regulating valve in the system pipeline.

[0113] Specifically, if it is determined that the cooling output in the cooling mode does not match the cooling demand, the first critical temperature difference |ΔU| is calculated based on the absolute value of the difference between the cooling water outlet temperature U and the cooling water outlet temperature threshold U0. Based on |ΔU|, the initial adjustment of the cooling tower fan and chilled water pump in the cooling mode is determined, where |ΔU|=|U-U0|.

[0114] In one specific embodiment, a preset first critical temperature difference ΔU0 is set in advance. Based on the comparison between |ΔU| and ΔU0, the initial adjustment amount of the cooling tower fan frequency and chilled water pump speed under the cooling mode is determined. ΔU0 can be divided into a first preset first critical temperature difference ΔU01 and a second preset first critical temperature difference ΔU02. For example, ΔU01 can be set to 0.5℃ and ΔU02 to 1.0℃.

[0115] If |ΔU| is less than or equal to ΔU01, the initial adjustment values ​​for the cooling tower fan frequency and chilled water pump speed in cooling mode are determined to be ±2Hz and ±5%, respectively; if |ΔU| is greater than ΔU01 and less than or equal to ΔU02, the initial adjustment values ​​for the cooling tower fan frequency and chilled water pump speed in cooling mode are determined to be ±4Hz and ±10%, respectively; if |ΔU| is greater than ΔU02, the initial adjustment values ​​for the cooling tower fan frequency and chilled water pump speed in cooling mode are determined to be ±6Hz and ±15%, respectively. The sign of the initial adjustment value is determined by the sign of ΔU. When ΔU is greater than 0, the adjustment value is positive, indicating an increase in the cooling tower fan frequency and chilled water pump speed; when ΔU is less than 0, the adjustment value is negative, indicating a decrease in the cooling tower fan frequency and chilled water pump speed.

[0116] If it is determined that the cooling output in the cooling mode does not match the cooling demand, the second key temperature difference |ΔX| is calculated based on the absolute value of the difference between the chilled water outlet temperature X and the chilled water outlet temperature threshold X0. Based on |ΔX|, the initial adjustment amount of the magnetic levitation compressor frequency, cooling tower fan frequency and chilled water pump speed in the cooling mode is determined, where |ΔX|=|X-X0|.

[0117] In one specific embodiment, a preset second key temperature difference ΔX0 is set in advance. Based on the comparison between |ΔX| and ΔX0, the initial adjustment amount of the magnetic levitation compressor frequency, cooling tower fan frequency and chilled water pump speed in the refrigeration mode is determined. ΔX0 can be divided into a first preset second key temperature difference ΔX01 and a second preset second key temperature difference ΔX02. For example, ΔX01 can be set to 0.3℃ and ΔX02 to 0.8℃.

[0118] If |ΔX| is less than or equal to ΔX01, the initial adjustment values ​​for the magnetic levitation compressor frequency, cooling tower fan frequency, and chilled water pump speed in refrigeration mode are determined to be ±1Hz, ±1Hz, and ±2%, respectively. If |ΔX| is greater than ΔX01 and less than or equal to ΔX02, the initial adjustment values ​​for the magnetic levitation compressor frequency, cooling tower fan frequency, and chilled water pump speed in refrigeration mode are determined to be ±3Hz, ±2Hz, and ±5%, respectively. If |ΔX| is greater than ΔX02, the initial adjustment values ​​for the magnetic levitation compressor frequency, cooling tower fan frequency, and chilled water pump speed in refrigeration mode are determined to be ±5Hz, ±4Hz, and ±8%, respectively. The sign of the initial adjustment value is determined by the sign of ΔX. When ΔX is greater than 0, the adjustment value is positive, indicating an increase in the magnetic levitation compressor frequency, cooling tower fan frequency, and chilled water pump speed; when ΔX is less than 0, the adjustment value is negative, indicating a decrease in the magnetic levitation compressor frequency, cooling tower fan frequency, and chilled water pump speed.

[0119] If it is determined that the cooling output in the cold storage mode does not match the cooling demand, the third key temperature difference |ΔY| is calculated based on the absolute value of the difference between the temperature Y of the cold storage device and the cold storage completion temperature threshold Y0. Based on |ΔY|, the initial adjustment amounts of the magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed, cold storage valve opening degree, and terminal valve opening degree in the cold storage mode are determined, where |ΔY|=|Y-Y0|.

[0120] In one specific embodiment, a preset third key temperature difference ΔY0 is set in advance. Based on the comparison between |ΔY| and ΔY0, the initial adjustment amount of the magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed, cold storage valve opening degree, and terminal valve opening degree in the cold storage mode is determined. The preset third key temperature difference ΔY0 can be divided into a first preset third key temperature difference ΔY01 and a second preset third key temperature difference ΔY02. For example, ΔY01 can be set to 0.8℃ and ΔY02 to 1.5℃.

[0121] If |ΔY| is less than or equal to ΔY01, the initial adjustment values ​​for the magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed, and cold storage valve opening in cold storage mode are determined to be ±3Hz, ±2Hz, ±1%, and ±2%, respectively, and the reverse initial adjustment value for the terminal valve opening is ±3%. If |ΔY| is greater than ΔY01 and less than or equal to ΔY02, the initial adjustment values ​​for the magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed, and cold storage valve opening in cold storage mode are determined to be ±5Hz, ±3Hz, ±3%, and ±6%, respectively, and the reverse initial adjustment value for the terminal valve opening is ±5%. If |ΔY| is greater than ΔY02, the initial adjustment values ​​for the magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed, and cold storage valve opening in cold storage mode are determined to be ±7Hz, ±4Hz, ±5%, and ±10%, respectively, and the reverse initial adjustment value for the terminal valve opening is ±7%. The sign of the initial adjustment is determined by the sign of ΔY. When ΔY is greater than 0, the adjustment is positive, which means increasing the frequency of the magnetic levitation compressor, the frequency of the cooling tower fan, the speed of the chilled water pump, and the opening of the cold storage valve, and decreasing the opening of the terminal valve. When ΔY is less than 0, the adjustment is negative, which means decreasing the frequency of the magnetic levitation compressor, the frequency of the cooling tower fan, the speed of the chilled water pump, and the opening of the cold storage valve, and increasing the opening of the terminal valve.

[0122] If it is determined that the cooling output in the cooling release mode does not match the cooling demand, the fourth key temperature difference |ΔZ| is calculated based on the absolute value of the difference between the cooling release device temperature Z and the cooling release water supply temperature threshold Z0. Based on |ΔZ|, the initial adjustment amounts of the magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed and three-way valve opening in the cooling release mode are determined, where |ΔZ|=|Z-Z0|.

[0123] In one specific embodiment, a preset fourth key temperature difference ΔZ0 is set in advance. Based on the comparison between |ΔZ| and ΔZ0, the initial adjustment amount of the magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed and three-way valve opening under the cooling release mode is determined. ΔZ0 can be divided into a first preset fourth key temperature difference ΔZ01 and a second preset fourth key temperature difference ΔZ02. For example, ΔZ01 can be set to 0.6℃ and ΔZ02 to 1.2℃.

[0124] If |ΔZ| is less than or equal to ΔZ01, the initial adjustment values ​​for the magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed, and three-way valve opening under the cooling release mode are determined to be ±2Hz, ±1Hz, ±2%, and ±3%, respectively; if |ΔZ| is greater than ΔZ01 and less than or equal to ΔZ02, the initial adjustment values ​​for the magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed, and three-way valve opening under the cooling release mode are determined to be ±4Hz, ±3Hz, ±5%, and ±8%, respectively; if |ΔZ| is greater than ΔZ02, the initial adjustment values ​​for the magnetic levitation compressor, cooling tower fan, chilled water pump, and three-way valve opening under the cooling release mode are determined to be ±6Hz, ±5Hz, ±10%, and ±15%, respectively. The sign of the initial adjustment is determined by the sign of ΔZ. When ΔZ is greater than 0, the adjustment is positive, which means increasing the frequency of the magnetic levitation compressor, the frequency of the cooling tower fan, the speed of the chilled water pump, and the opening of the cold storage valve. When ΔZ is less than 0, the adjustment is negative, which means decreasing the frequency of the magnetic levitation compressor, the frequency of the cooling tower fan, the speed of the chilled water pump, and the opening of the three-way valve.

[0125] S7: Obtain the current mutation rate of key components under different operating modes;

[0126] Specifically, the current of key components in operation is periodically sampled at a fixed sampling period Δt to obtain the real-time current working sequence I(n), where n represents the nth sampling time among several sampling times.

[0127] Based on the current value I(n) of the current sampling period and the current value of the previous sampling period The current mutation rate K is calculated by taking the rated current I of the equipment. The calculation process is K=[|I(n)-I(n−1)|] / (Δt×I).

[0128] It should be noted that for valves without current monitoring capabilities, the valve position feedback change rate V can be calculated from the valve position feedback change amount ΔP, where V = ΔP / Δt. The valve position feedback change rate V is used to substitute for the current mutation rate K for equivalent determination. The equivalent current coefficient α is calibrated using the actuator's full stroke time T, converting the valve position feedback change rate V into an equivalent current change. The calculation process is as follows Based on This is equivalent to the current mutation rate K, where, The actuators include a cold storage valve, a three-way valve, and a terminal valve.

[0129] S8: Determine the current mutation threshold of the corresponding key components based on different working modes, and correct the initial adjustment amount based on the comparison result of the current mutation rate and the corresponding current mutation threshold.

[0130] Please see Figure 4 As shown, it is a flowchart of the logic for determining the initial adjustment amount of the key component for cooling output correction based on the comparison result of the first current mutation rate and the first current mutation threshold in an embodiment of the present invention.

[0131] Specifically, when in cooling mode, a first current mutation threshold K10 is preset, and the first current mutation rate K1 is compared with the first current mutation threshold K10 to determine the initial adjustment amount of the cooling tower fan frequency and chilled water pump speed after correction in cooling mode.

[0132] In this embodiment, historical operating data collected under the condition that the cooling tower fan and chilled water pump equipment are in good working order and operating without faults are statistically correlated to obtain a mutation rate sample set. Specific high quantiles within this sample set are established as the gradient current mutation rate threshold range. For example, the 90th percentile is established as the warning threshold K10warn, and the 99th percentile is established as the fault threshold K10fault, thus forming the threshold range K10 = [K10warn, K10fault]. The threshold range of K10 effectively enables gradient identification of equipment status, accurately distinguishing between normal adjustment fluctuations, early abnormal signs, and severe fault mutations. This provides a graded quantitative judgment benchmark for the equipment operating status in cooling mode, from early warning monitoring to emergency protection. For example, K10 can be set to [12, 18]% / s. The process of comparing the first current mutation rate K1 with the first current mutation threshold K10 is as follows:

[0133] If K1 is greater than K10 (specifically greater than 18% / s), it indicates that the cooling tower fan or chilled water pump is experiencing severe mechanical jamming, electrical insulation failure, or sudden load impact. Therefore, it is determined to reduce the initial adjustment amount to ensure system safety, where:

[0134] The difference between the first current mutation rate K1 and the maximum value of the first current mutation rate threshold is calculated and denoted as the first current mutation difference ΔKF. ΔKF is then divided into the first current mutation first difference ΔKF1 and the first current mutation second difference ΔKF2. For example, ΔKF1 = 2% / s and ΔKF2 = 6% / s are set. Based on the comparison results of ΔKF with ΔKF1 and ΔKF2, the reduction range of the initial adjustment amount of the critical component under cooling mode is determined. Specifically, the larger ΔKF is, the more severe the degree to which the real-time monitored current mutation rate K1 exceeds the fault safety threshold, the more intense the abnormal mechanical stress or electrical shock experienced by the equipment is, and the system operating state is rapidly deviating from the safety boundary. Therefore, the reduction range of the initial adjustment amount of the critical component under cooling mode increases with the increase of ΔKF.

[0135] If ΔKF is less than or equal to ΔKF1, a first reduction adjustment command is generated for the initial adjustment of the cooling tower fan frequency in cooling mode, reducing the initial adjustment to 0.8 times the initial value. A first reduction adjustment command is also generated for the initial adjustment of the chilled water pump speed in cooling mode, reducing the initial adjustment to 0.75 times the initial value. If the initial adjustment values ​​of the cooling tower fan frequency and chilled water pump speed in cooling mode are ±2Hz and ±5% respectively, then the corresponding initial adjustment values ​​after reduction are ±1.6Hz and ±3.85% respectively.

[0136] If ΔKF is greater than ΔKF1 and less than or equal to ΔKF2, then a second reduction adjustment command is generated for the initial adjustment of the cooling tower fan frequency in cooling mode, reducing the initial adjustment to 0.65 times the initial value, and a second reduction adjustment command is generated for the initial adjustment of the chilled water pump speed in cooling mode, reducing the initial adjustment to 0.7 times the initial value.

[0137] If ΔKF is greater than ΔKF2, then a third reduction adjustment command is generated for the initial adjustment of the cooling tower fan frequency in cooling mode, reducing the initial adjustment to 0.5 times the initial value, and a third reduction adjustment command is generated for the initial adjustment of the chilled water pump speed in cooling mode, reducing the initial adjustment to 0.65 times the initial value.

[0138] If K1 equals K10, it indicates that the real-time monitored current mutation rate has just reached the preset state classification critical point, and the equipment is operating in a precise critical state. Therefore, no initial adjustment correction operation is required.

[0139] If K1 is less than K10 (specifically less than 12% / s), it indicates that the operating current of the key components changes extremely smoothly, and the equipment is in a highly efficient and stable golden operating condition. Its dynamic response capability fully meets or even exceeds the requirements of safety control. Therefore, it is determined to increase the initial adjustment amount, where:

[0140] The difference between the minimum value of the first current mutation rate threshold and the first current mutation rate K1 is calculated and denoted as the first current mutation offset value ΔKE. A first current mutation offset value ΔKE1 and a second current mutation offset value ΔKE2 are preset, and ΔKE1 = 3% / s and ΔKE2 = 7% / s are set for example. Based on the comparison results of ΔKE with ΔKE1 and ΔKE2, the increase in the initial adjustment amount under cooling mode is determined. A larger ΔKE indicates a more stable equipment current, a more stable operating state, and a more sufficient safety margin for rapid and powerful system adjustment. Therefore, the increase in the initial adjustment amount under cooling mode increases with the increase of ΔKE.

[0141] If ΔKE is less than or equal to ΔKE1, a first increase adjustment command is generated for the initial adjustment of the cooling tower fan frequency in cooling mode, increasing the initial adjustment to 1.2 times the initial value; and a first increase adjustment command is generated for the initial adjustment of the chilled water pump speed in cooling mode, increasing the initial adjustment to 1.3 times the initial value. Wherein, if the initial adjustment values ​​of the cooling tower fan frequency and chilled water pump speed in cooling mode are ±2Hz and ±5% respectively, then the corresponding initial adjustment values ​​after the increase adjustment are ±2.4Hz and ±6.5% respectively.

[0142] If ΔKE is greater than ΔKE1 and less than or equal to ΔKE2, then a second increase adjustment command is generated for the initial adjustment of the cooling tower fan frequency in cooling mode, increasing the initial adjustment to 1.3 times the initial value, and a second increase adjustment command is generated for the initial adjustment of the chilled water pump speed in cooling mode, increasing the initial adjustment to 1.55 times the initial value.

[0143] If ΔKE is greater than ΔKE2, a third increase adjustment command is generated for the initial adjustment of the cooling tower fan frequency in cooling mode, increasing the initial adjustment to 1.4 times the initial value. A third increase adjustment command is also generated for the initial adjustment of the chilled water pump speed in cooling mode, increasing the initial adjustment to 1.75 times the initial value.

[0144] When in cooling mode, a second current mutation threshold K20 is preset. The second current mutation rate K2 is compared with the second current mutation threshold K20 to determine the initial adjustment amount of the corrected magnetic levitation compressor frequency, cooling tower fan frequency and chilled water pump speed in cooling mode.

[0145] In this embodiment, historical operating data collected under the condition that the magnetic levitation compressor, cooling tower fan, and chilled water pump are in good working order and operating without faults are statistically correlated to obtain a joint sample set of equipment mutation rates. Specific high quantiles within this sample set are calculated, and the resulting statistical values ​​are established as a gradient current mutation rate threshold range applicable to the cooling mode. For example, the 92nd percentile is established as the warning threshold K20warn, and the 99.5th percentile is established as the fault threshold K20fault, thus forming a threshold range K20 = [K20warn, K20fault]. The K20 threshold range provides a status identification benchmark for the composite electromechanical system (including high-speed magnetic levitation bearing, scroll compressor mechanism, fan, and water pump) in the cooling mode, accurately distinguishing between regulation fluctuations caused by normal load changes, early abnormal signs caused by slight equipment detuning or external disturbances, and severe mutations caused by mechanical or electrical faults. For example, K20 can be set to [8, 15]% / s. The process of comparing the second current mutation rate K2 with the second current mutation threshold K20 is as follows:

[0146] If K2 is greater than K10 (specifically, greater than 15% / s), it indicates a dangerous sudden change in the current of the critical component, and the operational stability of the entire mechanical refrigeration system is under serious threat. Therefore, it is determined to reduce the initial adjustment amount to ensure system safety, where:

[0147] The difference between the second current mutation rate K2 and the maximum value of the second current mutation rate threshold is calculated and denoted as the second current mutation difference ΔKN. A first difference ΔKN1 and a second difference ΔKN2 for the second current mutation are preset, with ΔKN1 = 2.5% / s and ΔKN2 = 6% / s set for example. Based on the comparison results of ΔKN with ΔKN1 and ΔKN2, the reduction magnitude of the initial adjustment amount in the cooling mode is determined. As ΔKN increases, the abnormal mutation degree of the equipment current is more severe, the severity of the corresponding mechanical or electrical fault is higher, and the risk of the system instantaneously leaving the safe operating range is greater. Therefore, the reduction magnitude of the initial adjustment amount in the cooling mode increases with the increase of ΔKN.

[0148] If ΔKN is less than or equal to ΔKN1, then a first reduction adjustment command is generated for the initial adjustment of the magnetic levitation compressor frequency in cooling mode, reducing the initial adjustment to 0.75 times the initial value; a first reduction adjustment command is generated for the initial adjustment of the cooling tower fan frequency in cooling mode, reducing the initial adjustment to 0.5 times the initial value; and a first reduction adjustment command is generated for the initial adjustment of the chilled water pump speed in cooling mode, reducing the initial adjustment to 0.6 times the initial value. Wherein, if the initial adjustment values ​​for the magnetic levitation compressor frequency, cooling tower fan frequency, and chilled water pump speed in cooling mode are ±1Hz, ±1Hz, and ±2%, respectively, then the corresponding initial adjustment values ​​after reduction are 0.75Hz, ±0.5Hz, and ±1.2%, respectively.

[0149] If ΔKN is greater than ΔKN1 and less than or equal to ΔKN2, then a second reduction adjustment command is generated for the initial adjustment amount of the magnetic levitation compressor frequency in cooling mode, reducing the initial adjustment amount to 0.65 times the initial value; a second reduction adjustment command is generated for the initial adjustment amount of the cooling tower fan frequency in cooling mode, reducing the initial adjustment amount to 0.45 times the initial value; and a second reduction adjustment command is generated for the initial adjustment amount of the chilled water pump speed in cooling mode, reducing the initial adjustment amount to 0.55 times the initial value.

[0150] If ΔKN is greater than ΔKN2, then a third reduction adjustment command is generated for the initial frequency adjustment of the magnetic levitation compressor in cooling mode, reducing the initial adjustment amount to 0.55 times the initial value; a third reduction adjustment command is generated for the initial frequency adjustment of the cooling tower fan in cooling mode, reducing the initial adjustment amount to 0.4 times the initial value; and a third reduction adjustment command is generated for the initial speed adjustment of the chilled water pump in cooling mode, reducing the initial adjustment amount to 0.45 times the initial value.

[0151] If K2 equals K20, it indicates that the real-time monitored current mutation rate has just touched the preset state classification critical point, and the equipment is operating in a precise critical state. Therefore, there is no need to perform initial adjustment correction.

[0152] If K2 is less than K20 (specifically less than 8% / s), it indicates that the current dynamics of the key components are relatively stable, and all equipment is operating within its efficient and stable optimal operating range. Therefore, it is determined to increase the initial adjustment amount, where:

[0153] The difference between the minimum value of the second current mutation rate threshold and the second current mutation rate K2 is calculated and recorded as the first current mutation offset value ΔKM. A first current mutation first offset value ΔKM1 and a first current mutation second offset value ΔKM2 are preset, and ΔKM1 = 4% / s and ΔKM2 = 8% / s are set for example. Based on the comparison results of ΔKM with ΔKM1 and ΔKM2, the increase in the initial adjustment amount under cooling mode is determined. As ΔKM increases, the actual current mutation rate K2 of the equipment is smaller, the operating status of the magnetic levitation compressor, cooling tower fan, and chilled water pump is more stable and healthier, and the safety and reliability margin for rapid and powerful system adjustment is more sufficient. Therefore, the increase in the initial adjustment amount under cooling mode increases with the increase of ΔKM.

[0154] If ΔKM is less than or equal to ΔKM1, then a first increase adjustment command is generated for the initial adjustment of the magnetic levitation compressor frequency in cooling mode, increasing the initial adjustment to 1.05 times the initial value; a first increase adjustment command is generated for the initial adjustment of the cooling tower fan frequency in cooling mode, increasing the initial adjustment to 1.3 times the initial value; and a first increase adjustment command is generated for the initial adjustment of the chilled water pump speed in cooling mode, increasing the initial adjustment to 1.1 times the initial value. Wherein, if the initial adjustment of the magnetic levitation compressor frequency in cooling mode is ±1Hz, the initial adjustment of the cooling tower fan frequency is ±1Hz, and the initial adjustment of the chilled water pump speed is ±2%, then the corresponding initial adjustment values ​​after the increase are ±1.05Hz, ±1.3Hz, and ±2.2%, respectively.

[0155] If ΔKM is greater than ΔKM1 and less than or equal to ΔKM2, then a second increase adjustment command is generated for the initial adjustment of the magnetic levitation compressor frequency in cooling mode, increasing the initial adjustment to 1.25 times the initial value; a second increase adjustment command is generated for the initial adjustment of the cooling tower fan frequency in cooling mode, increasing the initial adjustment to 1.5 times the initial value; and a second increase adjustment command is generated for the initial adjustment of the chilled water pump speed in cooling mode, increasing the initial adjustment to 1.3 times the initial value.

[0156] If ΔKM is greater than ΔKM2, then a third increase adjustment command is generated for the initial frequency adjustment of the magnetic levitation compressor in cooling mode, increasing the initial adjustment to 1.45 times the initial value; a third increase adjustment command is generated for the initial frequency adjustment of the cooling tower fan in cooling mode, increasing the initial adjustment to 1.7 times the initial value; and a third increase adjustment command is generated for the initial speed adjustment of the chilled water pump in cooling mode, increasing the initial adjustment to 1.5 times the initial value.

[0157] When in cold storage mode, a third current mutation threshold K30 is preset. The third current mutation rate K3 is compared with the third current mutation threshold K30 to determine the initial adjustment amount of the corrected magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed, cold storage valve opening, and the reverse initial adjustment amount of the terminal valve opening in cold storage mode.

[0158] In this embodiment, when the system is operating in cold storage mode (i.e., the host is charging the cold storage device while bearing the basic cooling load), historical data collected under the condition that the magnetic levitation compressor, cooling tower fan, chilled water pump, and system pipeline regulating valve are in good working order and operating without faults are statistically correlated to obtain a sample set of joint mutation rates of the equipment. Specific high quantiles calculated from these samples are then established as the gradient current mutation rate threshold range applicable to this mode. For example, the 93rd percentile is established as the warning threshold K30warn, and the 99.7th percentile is established as the fault calibration threshold K30fault for the full stroke time T of the actuator, thus forming the threshold range K30 = [K30warn, K30fault]. By using the K30 threshold range, a precise state identification benchmark can be provided for complex collaborative systems in cold storage mode, effectively distinguishing between current jumps caused by normal changes in cold storage load and valve start-stop and dangerous sudden changes caused by equipment abnormalities or malfunctions. For example, K30 can be set to [10, 20]% / s. The process of comparing the third current mutation rate K3 with the third current mutation threshold K30 is as follows:

[0159] If K3 is greater than K30 (specifically greater than 20% / s), it indicates that a critical component in this mode has experienced an extreme current surge, corresponding to sudden instability of the magnetic levitation bearing, solid-state jamming of the compressor scroll plate, or momentary short circuit or stall of the drive motor of the fan or water pump. Therefore, it is determined to reduce the initial adjustment amount to ensure system safety, where:

[0160] The difference between the third current mutation rate K3 and the maximum value among the third current mutation rate thresholds is calculated and denoted as the third current mutation difference ΔKG. A first third current mutation difference ΔKG1 and a second third current mutation difference ΔKG2 are preset, and ΔKG1 = 3% / s and ΔKG2 = 8% / s are set for example. Based on the comparison results of ΔKG with ΔKG1 and ΔKG2, the reduction magnitude of the initial regulation amount in the cold storage mode is determined. As ΔKG increases, it indicates a deeper extent to which the current mutation rate exceeds the safety boundary, a more severe abnormal impact or substantial failure suffered by critical components, and a sharply increased risk of immediate system shutdown. Therefore, the reduction magnitude of the initial regulation amount in the cold storage mode increases with the increase of ΔKG.

[0161] If ΔKG is less than or equal to ΔKG1, then the following commands are generated: First, reduce the initial frequency adjustment of the magnetic levitation compressor in cold storage mode to 0.8 times its initial value; second, reduce the initial frequency adjustment of the cooling tower fan in cold storage mode to 0.85 times its initial value; third, reduce the initial speed adjustment of the chilled water pump in cold storage mode to 0.9 times its initial value; fourth, reduce the initial opening of the cold storage valve in cold storage mode to 0.95 times its initial value; and fifth, reduce the cold storage... The first reduction adjustment command for the reverse initial adjustment of the terminal valve opening in the mode reduces the reverse initial adjustment to 0.7 times the initial value. Specifically, if the initial adjustment values ​​of the magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed, and cold storage valve opening in the cold storage mode are ±3Hz, ±2Hz, ±1%, and ±2%, respectively, and the reverse initial adjustment value of the terminal valve opening is ±3%, then the corresponding initial adjustment values ​​after the reduction adjustment are ±2.4Hz, ±1.7Hz, ±0.9%, and ±1.9%, respectively, and the reverse initial adjustment value of the terminal valve opening is ±2.1%.

[0162] If ΔKG is greater than ΔKG1 and less than or equal to ΔKG2, then a second reduction adjustment command is generated for the initial frequency adjustment of the magnetic levitation compressor in cold storage mode, reducing the initial adjustment to 0.6 times the initial value; a second reduction adjustment command is generated for the initial frequency adjustment of the cooling tower fan in cold storage mode, reducing the initial adjustment to 0.75 times the initial value; a second reduction adjustment command is generated for the initial speed adjustment of the chilled water pump in cold storage mode, reducing the initial adjustment to 0.7 times the initial value; a second reduction adjustment command is generated for the initial opening of the cold storage valve in cold storage mode, reducing the initial adjustment to 0.85 times the initial value; and a second reduction adjustment command is generated for the reverse initial opening of the terminal valve in cold storage mode, reducing the reverse initial adjustment to 0.6 times the initial value.

[0163] If ΔKG is greater than ΔKG2, then the following commands are generated: the third reduction adjustment command for the initial frequency adjustment of the magnetic levitation compressor in cold storage mode, reducing the initial adjustment value to 0.4 times the initial value; the third reduction adjustment command for the initial frequency adjustment of the cooling tower fan in cold storage mode, reducing the initial adjustment value to 0.65 times the initial value; the third reduction adjustment command for the initial speed adjustment of the chilled water pump in cold storage mode, reducing the initial adjustment value to 0.5 times the initial value; the third reduction adjustment command for the initial opening of the cold storage valve in cold storage mode, reducing the initial adjustment value to 0.75 times the initial value; and the third reduction adjustment command for the reverse initial opening of the terminal valve in cold storage mode, reducing the reverse initial adjustment value to 0.5 times the initial value.

[0164] If K3 equals K30, it indicates that the real-time monitored current mutation rate has just reached the preset state classification critical point, and the equipment is operating in a precise critical state. Therefore, there is no need to perform initial adjustment correction.

[0165] If K3 is less than K30 (specifically less than 10% / s), it indicates that the current change of key components in the current cold storage mode is gradual, the system operation is stable, and there is no risk of abnormal impact, jamming, or short circuit. At this time, the control strategy switches from the safety protection mode to the energy efficiency optimization mode. Therefore, it is determined to increase the initial adjustment amount, where:

[0166] The difference between the minimum value of the third current mutation rate threshold and the third current mutation rate K3 is calculated and denoted as the third current mutation offset value ΔKH. A first offset value ΔKH1 and a second offset value ΔKH2 for the third current mutation are preset, and ΔKH1 = 3% / s and ΔKH2 = 7% / s are set for example. Based on the comparison results of ΔKH with ΔKH1 and ΔKH2, the increase in the initial adjustment amount under the cold storage mode is determined. As ΔKH increases, it indicates that the current mutation rate is far below the safety warning threshold, the system has a greater operational margin, the equipment has a larger responsiveness margin, and the feasibility of energy efficiency optimization and rapid adjustment is more significant. Therefore, the increase in the initial adjustment amount under the cold storage mode increases with the increase of ΔKH.

[0167] If ΔKH is less than or equal to ΔKH1, then the following commands are generated: First increase adjustment command for the initial frequency adjustment of the magnetic levitation compressor in cold storage mode, increasing the initial adjustment to 1.15 times the initial value; First increase adjustment command for the initial frequency adjustment of the cooling tower fan in cold storage mode, increasing the initial adjustment to 1.20 times the initial value; First increase adjustment command for the initial speed adjustment of the chilled water pump in cold storage mode, increasing the initial adjustment to 1.25 times the initial value; First increase adjustment command for the initial opening of the cold storage valve in cold storage mode, increasing the initial adjustment to 1.1 times the initial value; and cold storage... The initial adjustment amount of the terminal valve opening in the mode is increased by the first adjustment command and the initial adjustment amount is increased to 1.3 times the initial value. Specifically, if the initial adjustment amounts of the magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed, and cold storage valve opening in the cold storage mode are ±3Hz, ±2Hz, ±1%, and ±2%, respectively, and the initial adjustment amount of the terminal valve opening is ±3%, then the corresponding initial adjustment amounts for the increased adjustment are ±4.05Hz, ±2.9Hz, ±1.5%, and ±2.6%, respectively, and the initial adjustment amount of the terminal valve opening is ±4.8%.

[0168] If ΔKH is greater than ΔKH1 and less than or equal to ΔKH2, then a second increase adjustment command is generated for the initial frequency adjustment of the magnetic levitation compressor in cold storage mode, increasing the initial adjustment to 1.35 times the initial value; a second increase adjustment command is generated for the initial frequency adjustment of the cooling tower fan in cold storage mode, increasing the initial adjustment to 1.45 times the initial value; a second increase adjustment command is generated for the initial speed adjustment of the chilled water pump in cold storage mode, increasing the initial adjustment to 1.5 times the initial value; a second increase adjustment command is generated for the initial opening of the cold storage valve in cold storage mode, increasing the initial adjustment to 1.3 times the initial value; and a second increase adjustment command is generated for the reverse initial opening of the terminal valve in cold storage mode, increasing the initial adjustment to 1.6 times the initial value.

[0169] If ΔKH is greater than ΔKH2, then a third increase adjustment command is generated for the initial frequency adjustment of the magnetic levitation compressor in cold storage mode, increasing the initial adjustment to 1.55 times the initial value; a third increase adjustment command is generated for the initial frequency adjustment of the cooling tower fan in cold storage mode, increasing the initial adjustment to 1.7 times the initial value; a third increase adjustment command is generated for the initial speed adjustment of the chilled water pump in cold storage mode, increasing the initial adjustment to 1.8 times the initial value; a third increase adjustment command is generated for the initial opening of the cold storage valve in cold storage mode, increasing the initial adjustment to 1.5 times the initial value; and a third increase adjustment command is generated for the reverse initial opening of the terminal valve in cold storage mode, increasing the reverse initial adjustment to 1.9 times the initial value.

[0170] When in the cooling release mode, a fourth current mutation threshold K40 is preset. The fourth current mutation rate K4 is compared with the fourth current mutation threshold K40 to determine the initial adjustment amount of the corrected magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed and three-way valve opening in this mode.

[0171] In this embodiment, under the condition that the magnetic levitation compressor, cooling tower fan, chilled water pump, and system pipeline regulating valves are in good working order and operating without faults, historical data of the system operating in cold storage mode (i.e., the main unit completely stops the basic cooling load and focuses solely on charging the cold storage device, while the terminal load is met by the release of cold from other cold sources or the cold storage device) are collected. Statistical correlation is then performed to obtain a sample set of joint mutation rates of the equipment, and specific high quantiles are calculated and established as the gradient current mutation rate threshold range applicable to this mode. For example, the 93rd percentile is established as the warning threshold K40warn, and the 99.7th percentile is established as the fault threshold K40fault, thus forming the threshold range K40 = [K40warn, K40fault]. By using the K40 threshold range, a precise state identification benchmark can be provided for a single charging condition in the cold storage mode. This effectively distinguishes between slow current changes caused by normal cold storage load ramp-up and smooth valve adjustment, and dangerous sudden changes caused by equipment abnormalities or malfunctions. For example, K40 can be set to [8, 15]% / s. The process of comparing the fourth current mutation rate K4 with the fourth current mutation threshold K40 is as follows:

[0172] If K4 is greater than K40 (specifically greater than 15% / s), it indicates that a critical component in the cold storage mode has experienced an extreme current surge, and the system faces the risk of instantaneous shutdown. In this case, the control strategy switches from prioritizing cold release to prioritizing safety. Therefore, it is determined to reduce the initial adjustment amount to ensure system safety, where:

[0173] The difference between the fourth current mutation rate K4 and the maximum value among the fourth current mutation rate thresholds is calculated and denoted as the fourth current mutation difference ΔKP. A first fourth current mutation difference ΔKP1 and a second fourth current mutation difference ΔKP2 are preset, with ΔKP1 = 2% / s and ΔKP2 = 5% / s set for example. Based on the comparison results of ΔKP with ΔKP1 and ΔKP2, the reduction magnitude of the initial regulation amount in the cooling mode is determined. As ΔKP increases, it indicates a deeper extent to which the current mutation rate exceeds the safety boundary, a more severe abnormal impact or substantial failure suffered by critical components, and a sharply increased risk of immediate system shutdown. Therefore, the reduction magnitude of the initial regulation amount in the cooling mode increases with the increase of ΔKP.

[0174] If ΔKP is less than or equal to ΔKP1, then a first reduction adjustment command is generated for the initial adjustment of the magnetic levitation compressor frequency in the cooling release mode, reducing the initial adjustment to 0.85 times the initial value; a first reduction adjustment command is generated for the initial adjustment of the cooling tower fan frequency in the cooling release mode, reducing the initial adjustment to 0.9 times the initial value; a first reduction adjustment command is generated for the initial adjustment of the chilled water pump speed in the cooling release mode, reducing the initial adjustment to 0.9 times the initial value; and a first reduction adjustment command is generated for the initial adjustment of the three-way valve opening in the cooling release mode, reducing the initial adjustment to 0.95 times the initial value. Wherein, if the initial adjustment values ​​for the magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed, and three-way valve opening in the cooling release mode are ±2Hz, ±1Hz, ±2%, and ±3%, respectively, then the corresponding initial adjustment values ​​after reduction are ±1.7Hz, ±0.9Hz, ±1.8%, and ±2.85%, respectively.

[0175] If ΔKP is greater than ΔKP1 and less than or equal to ΔKP2, then a second reduction adjustment command is generated for the initial adjustment of the magnetic levitation compressor frequency in the cooling mode, reducing the initial adjustment to 0.6 times the initial value; a second reduction adjustment command is generated for the initial adjustment of the cooling tower fan frequency in the cooling mode, reducing the initial adjustment to 0.7 times the initial value; a second reduction adjustment command is generated for the initial adjustment of the chilled water pump speed in the cooling mode, reducing the initial adjustment to 0.75 times the initial value; and a second reduction adjustment command is generated for the initial adjustment of the three-way valve opening in the cooling mode, reducing the initial adjustment to 0.8 times the initial value.

[0176] If ΔKP is greater than ΔKP2, then a third reduction adjustment command is generated for the initial frequency adjustment of the magnetic levitation compressor in the cooling mode, reducing the initial adjustment to 0.4 times the initial value; a third reduction adjustment command is generated for the initial frequency adjustment of the cooling tower fan in the cooling mode, reducing the initial adjustment to 0.5 times the initial value; a third reduction adjustment command is generated for the initial speed adjustment of the chilled water pump in the cooling mode, reducing the initial adjustment to 0.55 times the initial value; and a third reduction adjustment command is generated for the initial opening of the three-way valve in the cooling mode, reducing the initial adjustment to 0.6 times the initial value.

[0177] If K4 equals K40, it indicates that the real-time monitored current mutation rate has just reached the preset state classification critical point, and the equipment is operating in a precise critical state. Therefore, no initial adjustment correction operation is required.

[0178] If K4 is less than K40 (specifically less than 8% / s), it indicates that the current change of key components in the current cooling mode is gradual, the system is operating stably, and there is no risk of abnormal impact, jamming, or short circuit. At this time, the control strategy switches from safety protection mode to energy efficiency optimization mode. Therefore, it is determined to increase the initial adjustment amount, where:

[0179] The difference between the minimum value of the fourth current mutation rate threshold and the fourth current mutation rate K4 is calculated and denoted as the fourth current mutation offset value ΔKQ. A first fourth current mutation offset value ΔKQ1 and a second fourth current mutation offset value ΔKQ2 are preset, with ΔKQ1 = 2% / s and ΔKQ2 = 5% / s set for example. Based on the comparison results of ΔKQ with ΔKQ1 and ΔKQ2, the increase in the initial adjustment amount under the cooling release mode is determined. As ΔKQ increases, it indicates that the current mutation rate is far below the safety warning threshold, the system has a greater operational margin, the equipment has a larger responsiveness margin, and the feasibility of energy efficiency optimization and rapid adjustment is more significant. Therefore, the increase in the initial adjustment amount under the cooling release mode increases with the increase of ΔKQ.

[0180] If ΔKQ is less than or equal to ΔKQ1, then a first increase adjustment command is generated for the initial adjustment of the magnetic levitation compressor frequency in the cooling release mode, increasing the initial adjustment to 1.15 times the initial value; a first increase adjustment command is generated for the initial adjustment of the cooling tower fan frequency in the cooling release mode, increasing the initial adjustment to 1.2 times the initial value; a first increase adjustment command is generated for the initial adjustment of the chilled water pump speed in the cooling release mode, increasing the initial adjustment to 1.25 times the initial value; and a first increase adjustment command is generated for the initial adjustment of the three-way valve opening in the cooling release mode, increasing the initial adjustment to 1.1 times the initial value. Wherein, if the initial adjustment values ​​for the magnetic levitation compressor frequency, cooling tower fan frequency, chilled water pump speed, and three-way valve opening in the cooling release mode are ±2Hz, ±1Hz, ±2%, and ±3%, respectively, then the corresponding initial adjustment values ​​after the increase adjustment are ±2.3Hz, ±1.2Hz, ±2.5%, and ±3.3%, respectively.

[0181] If ΔKQ is greater than ΔKQ1 and less than or equal to ΔKQ2, then a second increase adjustment command is generated for the initial frequency adjustment of the magnetic levitation compressor in the cooling mode, increasing the initial adjustment to 1.35 times the initial value; a second increase adjustment command is generated for the initial frequency adjustment of the cooling tower fan in the cooling mode, increasing the initial adjustment to 1.45 times the initial value; a second increase adjustment command is generated for the initial speed adjustment of the chilled water pump in the cooling mode, increasing the initial adjustment to 1.5 times the initial value; and a second increase adjustment command is generated for the initial opening of the three-way valve in the cooling mode, increasing the initial adjustment to 1.3 times the initial value.

[0182] If ΔKQ is greater than ΔKQ2, then a third increase adjustment command is generated for the initial frequency adjustment of the magnetic levitation compressor in the cooling mode, increasing the initial adjustment to 1.55 times the initial value; a third increase adjustment command is generated for the initial frequency adjustment of the cooling tower fan in the cooling mode, increasing the initial adjustment to 1.7 times the initial value; a third increase adjustment command is generated for the initial speed adjustment of the chilled water pump in the cooling mode, increasing the initial adjustment to 1.8 times the initial value; and a third increase adjustment command is generated for the initial opening of the three-way valve in the cooling mode, increasing the initial adjustment to 1.5 times the initial value.

[0183] It should be noted that increasing or decreasing the initial adjustment amount will not have a negative impact on the control process.

[0184] S9: Based on the revised adjustment amount, the corresponding key components are controlled to ensure that the load of several key components in each mode can match the current load demand. While improving system energy efficiency, this effectively avoids operational risks caused by excessively rapid adjustment or equipment malfunction.

[0185] All technologies not mentioned in the above embodiments are existing technologies. It is understood that no specific limitation is made to any preset parameter or critical parameter in the embodiments of the present invention, and the above values ​​are not limited thereto. Those skilled in the art can adjust the preset parameters or critical parameters accordingly based on actual needs, analysis of historical data, or equipment usage.

[0186] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A load matching control method for an evaporative cooling magnetic levitation phase change air conditioner, characterized in that, include: Obtain the outdoor wet-bulb temperature and the system cooling load value; Based on the comparison between the outdoor wet-bulb temperature and the preset outdoor wet-bulb temperature, and based on the comparison between the system cooling load value and the preset system cooling load value, different operating modes are determined to be activated. The operating modes include cooling mode, refrigeration mode, cold storage mode, and cold release mode. Based on the different operating modes, corresponding key temperature thresholds are determined, including cooling water outlet temperature threshold, chilled water outlet temperature threshold, cold storage completion temperature threshold, and cold release supply water temperature threshold. Monitor the key operating temperatures corresponding to different operating modes, including the cooling water outlet temperature, the chilled water outlet temperature, the cold storage device temperature, and the cold release device temperature. Based on the comparison result between the key operating temperature and the key temperature threshold, it is determined whether the cooling output in the current operating mode matches the cooling demand. If it is determined that the cooling output in the current working mode does not match the cooling demand, the initial adjustment amount of one or more key components is determined, wherein the key components include the magnetic levitation compressor, cooling tower fan, chilled water pump and regulating valve in the system pipeline; Obtain the current mutation rate of the key component under different operating modes; The current mutation threshold corresponding to the key component is determined based on the different working modes, and the initial adjustment amount is corrected based on the comparison result between the current mutation rate and the corresponding current mutation threshold. The key components are controlled based on the corrected adjustment amount.

2. The load matching control method for an evaporative cooling magnetic levitation phase change air conditioner according to claim 1, characterized in that, The process of determining the initial adjustment values ​​for one or more key components includes: Based on the comparison between the critical temperature difference and the preset critical temperature difference, the initial adjustment amount of the one or more critical components is determined, wherein the critical temperature difference is the absolute value of the difference between the critical operating temperature and the critical temperature threshold.

3. The load matching control method for an evaporative cooling magnetic levitation phase change air conditioner according to claim 2, characterized in that, The process of correcting the initial adjustment amount includes: Based on the comparison results of the current mutation rate being greater than the maximum value among the current mutation thresholds, it is determined to reduce the initial adjustment amount, and the reduction of the initial adjustment amount is positively correlated with the difference between the current mutation rate and the maximum value among the current mutation thresholds. Based on the comparison results of the current mutation rate being less than the minimum value among the current mutation thresholds, it is determined to increase the initial adjustment amount, and the increase in the initial adjustment amount is negatively correlated with the difference between the minimum value among the current mutation thresholds and the current mutation rate.

4. The load matching control method for an evaporative cooling magnetic levitation phase change air conditioner according to claim 1, characterized in that, The determination of the corresponding key temperature threshold based on different operating modes includes: When in the cooling mode, the corresponding key temperature threshold is determined as the cooling water outlet temperature threshold. When in the cooling mode, the corresponding key temperature threshold is determined as the chilled water outlet temperature threshold. When in the cold storage mode, the corresponding key temperature threshold is determined as the cold storage completion temperature threshold. When in the cooling release mode, the corresponding key temperature threshold is determined as the cooling release water supply temperature threshold.

5. The load matching control method for an evaporative cooling magnetic levitation phase change air conditioner according to claim 4, characterized in that, The process of determining whether the cooling output in the current operating mode matches the cooling demand includes: If the critical operating temperature is greater than the critical temperature threshold, it is determined that the cooling output in the current operating mode is insufficient, and a mismatch with the cooling demand is identified. If the critical operating temperature is equal to the critical temperature threshold, it is determined that the cooling output in the current operating mode matches the cooling demand. If the critical operating temperature is lower than the critical temperature threshold, it is determined that the cooling output in the current operating mode is excessive, and a mismatch with the cooling demand is identified.

6. The load matching control method for an evaporative cooling magnetic levitation phase change air conditioner according to claim 1, characterized in that, The process of obtaining the current mutation rate of the key component under different operating modes includes: Periodically sample the real-time operating current of the key components; Calculate the absolute value of the current difference between the current sampling period and the previous sampling period, and then calculate the ratio with the sampling period duration to obtain the current mutation rate.

7. The load matching control method for an evaporative cooling magnetic levitation phase change air conditioner according to claim 1, characterized in that, The key components that need to be regulated under different operating modes include: In the cooling mode, the control objects are the cooling tower fan and the chilled water pump; In the cooling mode, the controlled components are the magnetic levitation compressor, the cooling tower fan, and the chilled water pump. In the cold storage mode or the cold release mode, the control objects are the magnetic levitation compressor, the cooling tower fan, the chilled water pump, and the regulating valves in the system pipeline.

8. The load matching control method for an evaporative cooling magnetic levitation phase change air conditioner according to claim 1, characterized in that, The process of obtaining the system cooling load value includes: Monitor the chilled water flow rate, chilled water supply temperature, and return water temperature, and calculate the difference between the return water temperature and the chilled water supply temperature to obtain the supply and return water temperature difference; The system cooling load value is calculated based on the chilled water flow rate and the supply and return water temperature difference.

9. The load matching control method for an evaporative cooling magnetic levitation phase change air conditioner according to claim 8, characterized in that, The process of determining which of the different operating modes to activate includes: If the outdoor wet-bulb temperature is lower than the preset outdoor wet-bulb temperature and the system cooling load value is lower than the first preset system cooling load value, the cooling mode is activated. If the outdoor wet-bulb temperature is lower than the preset outdoor wet-bulb temperature and the system cooling load value is greater than or equal to the first preset system cooling load value and less than the second preset system cooling load value, or if the outdoor wet-bulb temperature is greater than or equal to the preset outdoor wet-bulb temperature and the system cooling load value is less than the first preset system cooling load value, then the cooling mode is activated. If the outdoor wet-bulb temperature is greater than or equal to the preset outdoor wet-bulb temperature, and the system cooling load value is greater than or equal to the first preset system cooling load value, then the cooling release mode is activated. If the outdoor wet-bulb temperature is lower than the preset outdoor wet-bulb temperature and the system cooling load value is greater than or equal to the second preset system cooling load value, the cold storage mode is activated.

10. The load matching control method for an evaporative cooling magnetic levitation phase change air conditioner according to claim 9, characterized in that, The process of determining which of the different operating modes to activate also includes: When the cooling capacity provided by the cooling release mode meets the real-time cooling requirements, the key temperature threshold corresponding to the cooling mode or the refrigeration mode is increased according to the amount of cooling released by the cold storage device per unit time under the cooling release mode.

Images