A defrosting control method and system for a low-temperature heat pump

Abstract

The present invention provides a defrost control method and system for a low-temperature heat pump, including: determining a defrost protection condition based on the configuration parameters of the low-temperature heat pump, and monitoring the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment of the low-temperature heat pump in real time; determining a defrost intervention node for the low-temperature heat pump based on the defrost protection condition, and determining a differential defrost control strategy for the low-temperature heat pump based on the operating parameters and environmental parameters at different times; intervening in defrost control of the low-temperature heat pump according to the defrost intervention node based on the differential defrost control strategy, and dynamically switching the low-temperature heat pump to conventional defrost after the intervention defrost control ends. It is convenient to comprehensively deal with various faults, ensure the reliability of defrosting, improve the thoroughness of frost removal, ensure the defrost effect of the low-temperature heat pump, and ensure the stable operation of the low-temperature heat pump.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment control, and in particular to a defrosting control method and system for a low-temperature heat pump. Background Art

[0002] Low-temperature heat pump is a technical device that utilizes low-grade thermal energy. It can extract thermal energy in a low-temperature environment and convert it into a usable form of thermal energy, such as for heating, hot water supply or air conditioning systems. However, when the low-temperature heat pump is in operation, it will be affected by itself and the external environment, and frost will form on the surface. If the generated frost cannot be removed in time, it will affect the operation effect of the low-temperature heat pump.

[0003] At present, the defrosting logic of general low-temperature heat pumps will exit defrosting when the protection is triggered during the defrosting process, which often results in incomplete defrosting. Once the defrosting is not clean, it will be difficult to defrost it completely if there is accumulation, which will affect the operation of the heat pump. At the same time, most low-temperature heat pumps can only deal with a single fault situation when performing defrosting intervention, which greatly reduces the defrosting effect.

[0004] Therefore, in order to overcome the above-mentioned defects, the present invention provides a defrosting control method and system for a low-temperature heat pump. Summary of the invention

[0005] The present invention provides a defrost control method and system for a low-temperature heat pump, which are used to provide reliable data support for determining a differential defrost control strategy for the low-temperature heat pump by determining the defrost protection conditions of the low-temperature heat pump, the operating parameters of the low-temperature heat pump, and the environmental parameters of the working environment. Secondly, the defrost intervention node of the low-temperature heat pump is locked through the defrost protection conditions, so that it is convenient to intervene in the defrost control of the low-temperature heat pump in time when intervention is needed, thereby ensuring the timeliness of defrosting. At the same time, according to the operating parameters and environmental parameters, the differential defrost control strategy of the low-temperature heat pump under different conditions is accurately and effectively determined, thereby facilitating comprehensive response to various faults and ensuring the reliability of defrosting. Finally, according to the differential defrost control strategy and the defrost intervention node, the low-temperature heat pump is intervened in the defrost control, and the low-temperature heat pump is dynamically switched to conventional defrost after the intervention defrost control is completed, thereby improving the thoroughness of frost removal, ensuring the defrost effect of the low-temperature heat pump, and ensuring the stable operation of the low-temperature heat pump.

[0006] The present invention provides a defrosting control method for a low-temperature heat pump, comprising:

[0007] Step 1: Determine the defrost protection condition based on the configuration parameters of the low-temperature heat pump, and monitor the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment of the low-temperature heat pump in real time;

[0008] Step 2: Determine the defrost intervention node for the low-temperature heat pump based on the defrost protection condition, and determine the differential defrost control strategy for the low-temperature heat pump based on the operating parameters and environmental parameters at different times;

[0009] Step 3: Based on the difference defrost control strategy, the low-temperature heat pump is intervened in the defrost control according to the defrost intervention node, and the low-temperature heat pump is dynamically switched to conventional defrost after the intervention defrost control is completed.

[0010] Preferably, a defrost control method for a low-temperature heat pump, in step 1, determining a defrost protection condition based on a configuration parameter of the low-temperature heat pump, comprises:

[0011] Obtain configuration parameters of the low-temperature heat pump, and generate an access index based on the configuration parameters. At the same time, obtain access requirements based on the management terminal, and associate the access index with the access requirements to obtain a database access request;

[0012] Traversing the database in the server based on the database access request, and extracting defrosting influencing factors and historical operating parameters of the low-temperature heat pump based on the traversal results, wherein the historical operating parameters include defrost protection trigger parameters;

[0013] Quantify the defrosting influencing factors to obtain the defrosting influencing factor index value, and map the defrosting influencing factor index value with the historical operating parameters at the same time based on the time series of the historical operating parameters;

[0014] The linear relationship between the index value of the defrost influencing factor and the historical operating parameters is determined based on the simultaneous mapping results, and the defrost protection condition is determined based on the linear relationship.

[0015] Preferably, a defrost control method for a low-temperature heat pump determines the linear relationship between the defrost influencing factor index value and the historical operating parameter based on the instantaneous mapping result, including:

[0016] Bind the defrosting influencing factor index values ​​at different times with the mapping results of the historical operating parameters at the same time, build a control group, and determine the relative changes of the historical operating parameters with the defrosting influencing factor index values ​​at different times based on the control group;

[0017] Determine the convergence condition of the historical operating parameters and the index value of the defrosting influencing factor based on the relative change, and obtain the linear relationship between the index value of the defrosting influencing factor and the historical operating parameters based on the convergence condition;

[0018] Based on the linear relationship, the defrost protection conditions of the low-temperature heat pump under different conditions are obtained, and the defrost protection conditions of the low-temperature heat pump under different conditions are recorded and saved.

[0019] Preferably, a defrost control method for a low-temperature heat pump, in step 1, real-time monitoring of operating parameters of the low-temperature heat pump and environmental parameters of the working environment of the low-temperature heat pump includes:

[0020] Acquire a defrost-related component of the low-temperature heat pump, and determine a first sensor to be deployed and a deployment position of the first sensor to be deployed based on operation characteristics of the defrost-related component;

[0021] Based on the deployment position, the first sensor to be transmitted is deployed with guidance, and at the same time, the monitoring dimension of the working environment of the low-temperature heat pump is determined, and the second sensor to be deployed is determined based on the monitoring dimension;

[0022] Deploy the second sensor to be deployed based on the environmental monitoring requirement, and control the first sensor to be deployed and the second sensor to be deployed to monitor the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment of the low-temperature heat pump in real time based on the deployment result;

[0023] Add time tags to the operating parameters and environmental parameters monitored in real time, and transmit the operating parameters and environmental parameters back to the management terminal based on the added results.

[0024] Preferably, a defrost control method for a low-temperature heat pump transmits operating parameters and environmental parameters back to a management terminal based on the addition result, comprising:

[0025] Obtain the obtained operating parameters and environmental parameters, and visualize the operating parameters and environmental parameters in a rectangular coordinate system based on the time series;

[0026] Determine outlier sample points based on the visualization results and remove them. At the same time, determine the upper and lower sample values ​​of the outlier sample points, and determine the change trends of operating parameters and environmental parameters based on the visualization results.

[0027] The theoretical value of the location of the outlier sample point is determined based on the change trend and the upper and lower sample values, and the outlier sample point is replaced based on the theoretical value.

[0028] Preferably, in a defrost control method for a low-temperature heat pump, in step 2, determining a defrost intervention node for the low-temperature heat pump based on a defrost protection condition comprises:

[0029] Obtain the obtained defrost protection conditions, and decompose the defrost protection conditions into dimensions to obtain the defrost protection parameters of the low-temperature heat pump in each dimension;

[0030] Based on the active intervention requirement, the target parameter difference between the defrost intervention and the defrost protection parameter is determined, and based on the target parameter difference, the defrost intervention node of the low-temperature heat pump in each dimension is obtained;

[0031] The defrost intervention nodes in different dimensions are adapted for multi-point triggering at the same level, and are deployed in the main control center based on the adaptation results of multi-point triggering at the same level.

[0032] Preferably, a defrost control method for a low-temperature heat pump, in step 2, determining a differential defrost control strategy for the low-temperature heat pump based on operating parameters and environmental parameters at different times, includes:

[0033] The operating parameters and environmental parameters of the low-temperature heat pump at different times are obtained, and based on the data characteristics of the operating parameters and the environmental parameters, the operating characteristics of the low-temperature heat pump and the environmental characteristics of the environment in which the low-temperature heat pump is located are determined respectively;

[0034] Based on the preset control priority, the different defrost control strategies for low-temperature heat pumps in different states are matched according to the operating characteristics and environmental characteristics, including:

[0035] Determine a water temperature value of the low-temperature heat pump according to the operating characteristics, and when the water temperature value is less than a preset temperature threshold, iteratively adjust the flow and load at the end of the low-temperature water pump based on the first single adjustment amount until the water temperature is greater than the preset temperature threshold;

[0036] When the water temperature value of the low-temperature heat pump meets the preset temperature threshold and the outlet water temperature of the low-temperature heat pump is less than the defrost protection threshold, the compressor frequency of the low-temperature water pump is reduced based on the second single adjustment amount, and the speed state of the circulating water pump is monitored in real time based on the reduction result;

[0037] The compressor frequency is negatively feedback-regulated based on the speed state of the circulating water pump until the outlet water temperature of the low-temperature heat pump is greater than the defrost protection threshold;

[0038] When the water temperature value of the low-temperature heat pump meets the preset temperature threshold and the outlet water temperature of the low-temperature heat pump is higher than the defrost protection threshold, the pressure jump value of the low-temperature heat pump is obtained, and when the pressure jump value is greater than the preset pressure threshold, the compressor frequency of the low-temperature water pump is reduced based on the third single adjustment amount, and the fan is synchronously controlled to start the preset time;

[0039] Based on the matching results, the differential defrosting control strategies corresponding to the operating parameters and environmental parameters at different times are obtained.

[0040] Preferably, a defrost control method for a low-temperature heat pump, in step 3, performs intervention defrost control on the low-temperature heat pump according to the defrost intervention node based on the differential defrost control strategy, and dynamically switches the low-temperature heat pump to conventional defrost after the intervention defrost control ends, including:

[0041] Obtain the obtained differential defrost control strategy, and perform intervention defrost control on the low-temperature heat pump based on the defrost intervention node;

[0042] Performing a first real-time re-inspection on the low-temperature heat pump based on the intervention defrost control result, and obtaining a multi-dimensional state change parameter of the low-temperature heat pump based on the first real-time re-inspection result;

[0043] Subordinate matching is performed between the multi-dimensional state change parameter and the triggering condition of the differential defrost control strategy of the low-temperature heat pump, and the coordination node of the differential defrost control strategy is determined based on the subordinate matching result;

[0044] Determine the execution logic of the differential defrost control strategy based on the collaborative node, and perform intervention defrost control on the low-temperature heat pump based on the execution logic;

[0045] Performing a second real-time recheck on the low-temperature heat pump based on the intervention defrost control result, and determining a state correction amount of the low-temperature heat pump based on the second real-time recheck result;

[0046] The state correction amount is analyzed based on the preset evaluation index to determine the no-intervention defrost performance evaluation value of the low-temperature heat pump, and when the no-intervention defrost performance evaluation value is greater than the preset requirement, the intervention defrost control of the low-temperature heat pump is terminated and the low-temperature heat pump is dynamically switched to conventional defrost.

[0047] The present invention provides a defrosting control system for a low-temperature heat pump, comprising:

[0048] A parameter monitoring module, used to determine the defrost protection condition based on the configuration parameters of the low-temperature heat pump, and to monitor the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment of the low-temperature heat pump in real time;

[0049] A control strategy determination module, used to determine the defrost intervention node for the low-temperature heat pump based on the defrost protection condition, and to determine the differential defrost control strategy for the low-temperature heat pump based on the operating parameters and environmental parameters at different times;

[0050] The defrost control module is used to perform intervention defrost control on the low-temperature heat pump according to the defrost intervention node based on the differential defrost control strategy, and dynamically switch the low-temperature heat pump to conventional defrost after the intervention defrost control ends.

[0051] Preferably, a defrost control system of a low-temperature heat pump, a parameter monitoring module, comprises:

[0052] A request unit, used to obtain configuration parameters of the low-temperature heat pump, and generate an access index based on the configuration parameters, and at the same time, obtain an access requirement based on the management terminal, and associate the access index with the access requirement to obtain a database access request;

[0053] A data retrieval unit, configured to traverse a database in a server based on a database access request, and extract defrosting influencing factors and historical operating parameters of a low-temperature heat pump based on the traversal result, wherein the historical operating parameters include a defrost protection trigger parameter;

[0054] A mapping unit, used for quantifying the defrosting influencing factors, obtaining the defrosting influencing factor index value, and mapping the defrosting influencing factor index value with the historical operating parameters at the same time based on the time series of the historical operating parameters;

[0055] The defrost protection condition determination unit is used to determine the linear relationship between the defrost influencing factor index value and the historical operating parameter based on the simultaneous mapping result, and determine the defrost protection condition based on the linear relationship.

[0056] Compared with the prior art, the present invention has the following beneficial effects:

[0057] 1. By determining the defrost protection conditions of the low-temperature heat pump, the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment, reliable data support is provided for determining the differential defrost control strategy for the low-temperature heat pump. Secondly, the defrost intervention node of the low-temperature heat pump is locked through the defrost protection condition, so that it is convenient to intervene in the defrost control of the low-temperature heat pump in time when intervention is needed, ensuring the timeliness of defrosting. At the same time, according to the operating parameters and environmental parameters, the differential defrost control strategy of the low-temperature heat pump under different conditions is accurately and effectively determined, so as to facilitate comprehensive response to various faults and ensure the reliability of defrosting. Finally, according to the differential defrost control strategy and the defrost intervention node, the low-temperature heat pump is intervened in the defrost control, and the low-temperature heat pump is dynamically switched to conventional defrost after the intervention defrost control is completed, which improves the thoroughness of frost removal, ensures the defrost effect of the low-temperature heat pump, and ensures the stable operation of the low-temperature heat pump.

[0058] 2. By parsing the configuration parameters of the low-temperature heat pump, the defrost influencing factors and historical operating parameters of the low-temperature heat pump can be quickly and effectively obtained according to the analysis results and access requirements, providing data support for determining the defrost protection conditions of the low-temperature heat pump. Secondly, by correlating the obtained defrost influencing factor index values ​​with the historical operating parameters, the defrost protection conditions of the low-temperature heat pump can be accurately and effectively determined, thereby providing convenience and guarantee for accurate and effective defrost control of the low-temperature heat pump.

[0059] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures specifically pointed out in this application document.

[0060] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0062] Figure 1 This is a flow chart of a defrosting control method for a low-temperature heat pump in an embodiment of the present invention;

[0063] Figure 2 This is a flow chart of step 1 in a defrosting control method for a low-temperature heat pump in an embodiment of the present invention;

[0064] Figure 3 It is a structural diagram of a defrost control system of a low-temperature heat pump in an embodiment of the present invention. DETAILED DESCRIPTION

[0065] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0066] Embodiment 1:

[0067] This embodiment provides a defrosting control method for a low-temperature heat pump. Figure 1 As shown, including:

[0068] Step 1: Determine the defrost protection condition based on the configuration parameters of the low-temperature heat pump, and monitor the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment of the low-temperature heat pump in real time;

[0069] Step 2: Determine the defrost intervention node for the low-temperature heat pump based on the defrost protection condition, and determine the differential defrost control strategy for the low-temperature heat pump based on the operating parameters and environmental parameters at different times;

[0070] Step 3: Based on the difference defrost control strategy, the low-temperature heat pump is intervened in the defrost control according to the defrost intervention node, and the low-temperature heat pump is dynamically switched to conventional defrost after the intervention defrost control is completed.

[0071] In this embodiment, the configuration parameters are determined according to the factory parameters of the low-temperature heat pump, and are used to characterize the working conditions and operating conditions of the low-temperature heat pump when it is working.

[0072] In this embodiment, the defrost protection condition refers to the corresponding situation when the low-temperature heat pump terminates the defrost operation, including the water temperature value and the compressor frequency.

[0073] In this embodiment, the environmental parameters refer to the ventilation conditions, humidity, temperature, etc. of the environment where the low-temperature heat pump is located.

[0074] In this embodiment, the defrost intervention node refers to the timing of performing defrost intervention on the low-temperature heat pump, that is, under what circumstances it is necessary to perform defrost intervention on the low-temperature heat pump, that is, to control the flow and load of the low-temperature heat pump to achieve a change in water temperature.

[0075] In this embodiment, the differential defrost control strategy refers to the defrost control strategy corresponding to different states of the low-temperature heat pump, and the defrost control strategies corresponding to different states are different.

[0076] In this embodiment, the intervention defrost control refers to performing corresponding defrost control at corresponding defrost intervention nodes according to the obtained differential defrost control strategy, thereby ensuring that frost on the low-temperature heat pump can be effectively removed.

[0077] In this embodiment, conventional defrosting refers to a mode in which the low-temperature heat pump can perform defrosting under normal operation without intervention.

[0078] The working principle and beneficial effects of the above technical scheme are as follows: by determining the defrost protection conditions of the low-temperature heat pump, the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment, reliable data support is provided for determining the differential defrost control strategy for the low-temperature heat pump; secondly, the defrost intervention node of the low-temperature heat pump is locked through the defrost protection conditions, so that when intervention is needed, timely intervention defrost control of the low-temperature heat pump is carried out, thereby ensuring the timeliness of defrosting; at the same time, accurate and effective determination of the differential defrost control strategy of the low-temperature heat pump under different conditions is achieved according to the operating parameters and environmental parameters, thereby facilitating comprehensive response to various faults and ensuring the reliability of defrosting; finally, intervention defrost control is carried out on the low-temperature heat pump according to the differential defrost control strategy and the defrost intervention node, and the low-temperature heat pump is dynamically switched to conventional defrost after the intervention defrost control is completed, thereby improving the thoroughness of frost removal, ensuring the defrost effect of the low-temperature heat pump, and ensuring the stable operation of the low-temperature heat pump.

[0079] Embodiment 2:

[0080] Based on Example 1, this example provides a defrosting control method for a low-temperature heat pump, such as Figure 2 As shown, in step 1, the defrost protection condition is determined based on the configuration parameters of the low-temperature heat pump, including:

[0081] Step 101: obtaining configuration parameters of a low-temperature heat pump, and generating an access index based on the configuration parameters. At the same time, obtaining access requirements based on a management terminal, and associating the access index with the access requirements to obtain a database access request;

[0082] Step 102: traversing the database in the server based on the database access request, and extracting defrosting influencing factors and historical operating parameters of the low-temperature heat pump based on the traversal results, wherein the historical operating parameters include defrost protection trigger parameters;

[0083] Step 103: quantifying the defrost influencing factors to obtain defrost influencing factor index values, and mapping the defrost influencing factor index values ​​with the historical operating parameters at the same time based on the time series of the historical operating parameters;

[0084] Step 104: Determine the linear relationship between the defrost influencing factor index value and the historical operating parameter based on the instantaneous mapping result, and determine the defrost protection condition based on the linear relationship.

[0085] In this embodiment, the access index is generated according to the configuration parameters and is a reference for retrieving basic information of the low-temperature heat pump.

[0086] In this embodiment, the access requirement refers to the type of data and the time point of access that the management terminal needs to access.

[0087] In this embodiment, the defrosting influencing factors refer to the types of influences received by the low-temperature heat pump during the defrosting process, such as the external temperature and the pressure of the low-temperature heat pump.

[0088] In this embodiment, the defrost protection triggering parameter refers to the specific parameters corresponding to when the low-temperature heat pump triggers the defrost protection, including the water outlet temperature and the like.

[0089] In this embodiment, the defrost influencing factor index value refers to data obtained by characterizing the defrost influencing factor with a specific numerical value.

[0090] In this embodiment, the mapping at the same time refers to comparing the defrosting influencing factor index value and the historical operating parameters at the same time.

[0091] The working principle and beneficial effects of the above technical solution are: by parsing the configuration parameters of the low-temperature heat pump, the defrost influencing factors and historical operating parameters of the low-temperature heat pump can be quickly and effectively obtained according to the analysis results and access requirements, providing data support for determining the defrost protection conditions of the low-temperature heat pump; secondly, by correlating the obtained defrost influencing factor index values ​​with the historical operating parameters, the defrost protection conditions of the low-temperature heat pump can be accurately and effectively determined, thereby providing convenience and guarantee for accurate and effective defrost control of the low-temperature heat pump.

[0092] Embodiment 3:

[0093] On the basis of Example 2, this embodiment provides a defrost control method for a low-temperature heat pump, which determines the linear relationship between the defrost influencing factor index value and the historical operating parameter based on the simultaneous mapping result, including:

[0094] Bind the defrosting influencing factor index values ​​at different times with the mapping results of the historical operating parameters at the same time, build a control group, and determine the relative changes of the historical operating parameters with the defrosting influencing factor index values ​​at different times based on the control group;

[0095] Determine the convergence condition of the historical operating parameters and the index value of the defrosting influencing factor based on the relative change, and obtain the linear relationship between the index value of the defrosting influencing factor and the historical operating parameters based on the convergence condition;

[0096] Based on the linear relationship, the defrost protection conditions of the low-temperature heat pump under different conditions are obtained, and the defrost protection conditions of the low-temperature heat pump under different conditions are recorded and saved.

[0097] In this embodiment, the control group refers to a data group that can be used for data difference comparison after associating the defrosting influencing factor index values ​​at different times with the corresponding historical operating parameters.

[0098] In this embodiment, the relative change refers to the change of the same historical operating parameter at different times as the defrost influencing factor index value changes.

[0099] In this embodiment, the convergence condition is used to characterize the corresponding correlation relationship when the change relationship between the historical operating parameters and the index value of the defrosting influencing factor reaches stability.

[0100] The working principle and beneficial effect of the above technical scheme are: by analyzing the defrost influencing factor index values ​​and historical operating parameters at different times, the relative change relationship between the historical operating parameters and the defrost influencing factor index values ​​can be accurately and effectively determined, thereby achieving accurate and effective determination of the defrost protection conditions of the low-temperature heat pump, providing a reference basis for accurate and reliable defrost control of the low-temperature heat pump.

[0101] Embodiment 4:

[0102] Based on Example 1, this embodiment provides a defrost control method for a low-temperature heat pump. In step 1, the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment of the low-temperature heat pump are monitored in real time, including:

[0103] Acquire a defrost-related component of the low-temperature heat pump, and determine a first sensor to be deployed and a deployment position of the first sensor to be deployed based on operation characteristics of the defrost-related component;

[0104] Based on the deployment position, the first sensor to be transmitted is deployed with guidance, and at the same time, the monitoring dimension of the working environment of the low-temperature heat pump is determined, and the second sensor to be deployed is determined based on the monitoring dimension;

[0105] Deploy the second sensor to be deployed based on the environmental monitoring requirement, and control the first sensor to be deployed and the second sensor to be deployed to monitor the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment of the low-temperature heat pump in real time based on the deployment result;

[0106] Add time tags to the operating parameters and environmental parameters monitored in real time, and transmit the operating parameters and environmental parameters back to the management terminal based on the added results.

[0107] In this embodiment, the defrost-related components refer to all components related to defrost in the low-temperature heat pump.

[0108] In this embodiment, the operating characteristics refer to the operating conditions and operating modes of the defrosting-related components.

[0109] In this embodiment, the first sensor to be deployed is a sensor used to monitor the operating parameters of various defrost-related components in the low-temperature heat pump, including a temperature sensor and a pressure sensor.

[0110] In this embodiment, the monitoring dimension is used to characterize all types of items for monitoring the working environment of the low-temperature heat pump.

[0111] In this embodiment, the second sensor to be deployed refers to a sensor that monitors data of the working environment of the low-temperature heat pump, corresponding to the monitored temperature.

[0112] In this embodiment, the environmental monitoring requirements are known in advance.

[0113] In this embodiment, the time tag is used to mark the specific time information corresponding to the monitored operating parameters and environmental parameters.

[0114] The working principle and beneficial effect of the above technical solution are: by respectively determining the first sensor to be deployed and the second sensor to be deployed corresponding to the low-temperature heat pump and the working environment in which the low-temperature heat pump is located, it is possible to accurately and effectively monitor the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment in which the low-temperature heat pump is located according to the first sensor to be deployed and the second sensor to be deployed, thereby ensuring the accuracy and reliability of the operating parameters and environmental parameters finally obtained.

[0115] Embodiment 5:

[0116] Based on Example 4, this embodiment provides a defrosting control method for a low-temperature heat pump, which transmits operating parameters and environmental parameters back to a management terminal based on the addition result, including:

[0117] Obtain the obtained operating parameters and environmental parameters, and visualize the operating parameters and environmental parameters in a rectangular coordinate system based on the time series;

[0118] Determine outlier sample points based on the visualization results and remove them. At the same time, determine the upper and lower sample values ​​of the outlier sample points, and determine the change trends of operating parameters and environmental parameters based on the visualization results.

[0119] The theoretical value of the location of the outlier sample point is determined based on the change trend and the upper and lower sample values, and the outlier sample point is replaced based on the theoretical value.

[0120] In this embodiment, the Liqun sample point refers to data parameters with abnormal values ​​in the operating parameters and environmental parameters, that is, data with sudden value changes.

[0121] In this embodiment, the upper and lower sample values ​​refer to the data values ​​of the data adjacent to the outlier sample point.

[0122] In this embodiment, the theoretical value refers to the data value theoretically corresponding to the outlier sample point, that is, the specific value corresponding to the data satisfying the data change trend.

[0123] The working principle and beneficial effects of the above technical solution are: by visually displaying the obtained operating parameters and environmental parameters, it is possible to lock the outlier sample points in the operating parameters and environmental parameters according to the visualization results, and to remove and replace the locked outlier sample points, so as to achieve accurate and reliable cleaning of the operating parameters and environmental parameters, thereby ensuring the accuracy and reliability of the final parameters.

[0124] Embodiment 6:

[0125] Based on Example 1, this embodiment provides a defrost control method for a low-temperature heat pump. In step 2, a defrost intervention node for the low-temperature heat pump is determined based on a defrost protection condition, including:

[0126] Obtain the obtained defrost protection conditions, and decompose the defrost protection conditions into dimensions to obtain the defrost protection parameters of the low-temperature heat pump in each dimension;

[0127] Based on the active intervention requirement, the target parameter difference between the defrost intervention and the defrost protection parameter is determined, and based on the target parameter difference, the defrost intervention node of the low-temperature heat pump in each dimension is obtained;

[0128] The defrost intervention nodes in different dimensions are adapted for multi-point triggering at the same level, and are deployed in the main control center based on the adaptation results of multi-point triggering at the same level.

[0129] In this embodiment, the dimension splitting refers to splitting the defrost protection condition into individual independent parameters.

[0130] In this embodiment, the defrost protection parameter under each dimension refers to the specific data value corresponding to each dimension. For example, when the outlet water temperature is less than a certain value, the low-temperature heat pump will enter the defrost protection state, that is, stop the defrost operation.

[0131] In this embodiment, the active intervention requirement is known in advance, that is, it represents the specific requirement for entering the defrost intervention, for example, it may be that the active intervention is entered before entering the defrost protection condition.

[0132] In this embodiment, the target parameter difference is used to characterize the difference between the requirement when performing defrost intervention and the defrost protection parameter. For example, when the temperature in the defrost protection parameter is 30 degrees, the defrost intervention is 32 degrees, that is, when the outlet water temperature of the low-temperature heat pump is 32 degrees, active defrosting intervention is required, where 2 degrees is the target parameter difference.

[0133] In this embodiment, the defrost intervention node refers to the specific time of active intervention.

[0134] In this embodiment, the same-level multi-point trigger adaptation means that when there is a defrost protection parameter in one dimension that meets the requirements, the active intervention defrost mechanism will be actively triggered.

[0135] The working principle and beneficial effects of the above technical solution are: by analyzing the defrost protection conditions, the defrost intervention nodes in each dimension can be accurately and effectively determined; secondly, the obtained defrost intervention nodes are adapted for multi-point triggering at the same level, and the adaptation results are deployed, so as to facilitate timely defrost control when defrost intervention control is required, thereby ensuring the timeliness and reliability of defrost control for low-temperature heat pumps.

[0136] Embodiment 7:

[0137] Based on Example 1, this embodiment provides a defrost control method for a low-temperature heat pump. In step 2, a differential defrost control strategy for the low-temperature heat pump is determined based on operating parameters and environmental parameters at different times, including:

[0138] The operating parameters and environmental parameters of the low-temperature heat pump at different times are obtained, and based on the data characteristics of the operating parameters and the environmental parameters, the operating characteristics of the low-temperature heat pump and the environmental characteristics of the environment in which the low-temperature heat pump is located are determined respectively;

[0139] Based on the preset control priority, the different defrost control strategies for low-temperature heat pumps in different states are matched according to the operating characteristics and environmental characteristics, including:

[0140] Determine a water temperature value of the low-temperature heat pump according to the operating characteristics, and when the water temperature value is less than a preset temperature threshold, iteratively adjust the flow and load at the end of the low-temperature water pump based on the first single adjustment amount until the water temperature is greater than the preset temperature threshold;

[0141] When the water temperature value of the low-temperature heat pump meets the preset temperature threshold and the outlet water temperature of the low-temperature heat pump is less than the defrost protection threshold, the compressor frequency of the low-temperature water pump is reduced based on the second single adjustment amount, and the speed state of the circulating water pump is monitored in real time based on the reduction result;

[0142] The compressor frequency is negatively feedback-regulated based on the speed state of the circulating water pump until the outlet water temperature of the low-temperature heat pump is greater than the defrost protection threshold;

[0143] When the water temperature value of the low-temperature heat pump meets the preset temperature threshold and the outlet water temperature of the low-temperature heat pump is higher than the defrost protection threshold, the pressure jump value of the low-temperature heat pump is obtained, and when the pressure jump value is greater than the preset pressure threshold, the compressor frequency of the low-temperature water pump is reduced based on the third single adjustment amount, and the fan is synchronously controlled to start the preset time;

[0144] Based on the matching results, the differential defrosting control strategies corresponding to the operating parameters and environmental parameters at different times are obtained.

[0145] In this embodiment, data characteristics refer to data values ​​corresponding to operating parameters and environmental parameters and the types of data included.

[0146] In this embodiment, the operation characteristics refer to the operation mode of the low-temperature heat pump and the specific operations performed during the operation process.

[0147] In this embodiment, the environmental characteristics refer to the specific conditions of the environment in which the low-temperature heat pump is located, including the temperature and the like.

[0148] In this embodiment, the preset control priority is set in advance and is used to represent the order of determining corresponding strategies when performing defrost control on the low-temperature heat pump.

[0149] In this embodiment, the preset temperature threshold is set in advance, that is, it represents the critical point for the low-temperature heat pump to enter the defrost protection.

[0150] In this embodiment, the first single adjustment amount refers to the specific value corresponding to each adjustment of the flow and load at the end of the low-temperature water pump, that is, after multiple adjustments, it is ensured that the water temperature value meets the defrost control requirements.

[0151] In this embodiment, the second single adjustment amount refers to a specific value of a single reduction in the compressor frequency of the low-temperature water pump.

[0152] In this embodiment, the pressure jump value is used to represent the change in the pressure of the low-temperature heat pump.

[0153] In this embodiment, the preset pressure threshold is set in advance.

[0154] In this embodiment, the third single adjustment amount is a specific value for a single reduction in the compressor frequency when the pressure jump value of the low-temperature heat pump is greater than a preset pressure threshold, which is different from the second single adjustment amount.

[0155] The working principle and beneficial effects of the above technical scheme are: by analyzing the operating parameters of the low-temperature heat pump and the environmental parameters of the environment in which it is located, the operating characteristics of the low-temperature heat pump and the environmental characteristics of the environment in which the low-temperature heat pump is located are accurately and effectively determined. Secondly, according to the obtained operating characteristics and environmental characteristics, the different defrost control strategies of the low-temperature heat pump in different states are accurately and effectively determined, so as to facilitate the use of appropriate defrost control strategies for defrost control according to the specific operating conditions of the low-temperature heat pump, thereby ensuring the accuracy and reliability of defrost control of the low-temperature heat pump and ensuring the stable operation of the low-temperature heat pump.

[0156] Embodiment 8:

[0157] Based on Example 1, this embodiment provides a defrost control method for a low-temperature heat pump. In step 3, based on the difference defrost control strategy, the low-temperature heat pump is intervened in defrost control according to the defrost intervention node, and after the intervention defrost control is completed, the low-temperature heat pump is dynamically switched to conventional defrost, including:

[0158] Obtain the obtained differential defrost control strategy, and perform intervention defrost control on the low-temperature heat pump based on the defrost intervention node;

[0159] Performing a first real-time re-inspection on the low-temperature heat pump based on the intervention defrost control result, and obtaining a multi-dimensional state change parameter of the low-temperature heat pump based on the first real-time re-inspection result;

[0160] Subordinate matching is performed between the multi-dimensional state change parameter and the triggering condition of the differential defrost control strategy of the low-temperature heat pump, and the coordination node of the differential defrost control strategy is determined based on the subordinate matching result;

[0161] Determine the execution logic of the differential defrost control strategy based on the collaborative node, and perform intervention defrost control on the low-temperature heat pump based on the execution logic;

[0162] Performing a second real-time recheck on the low-temperature heat pump based on the intervention defrost control result, and determining a state correction amount of the low-temperature heat pump based on the second real-time recheck result;

[0163] The state correction amount is analyzed based on the preset evaluation index to determine the no-intervention defrost performance evaluation value of the low-temperature heat pump, and when the no-intervention defrost performance evaluation value is greater than the preset requirement, the intervention defrost control of the low-temperature heat pump is terminated and the low-temperature heat pump is dynamically switched to conventional defrost.

[0164] In this embodiment, the first real-time re-check refers to re-checking the current real-time defrost status of the low-temperature heat pump after the low-temperature heat pump is intervened in the defrost control.

[0165] In this embodiment, the multi-dimensional state change parameter refers to the degree to which the operating parameters of different aspects of the low-temperature heat pump change after the intervention of the defrost control.

[0166] In this embodiment, the purpose of performing subordination matching between the multi-dimensional state change parameter and the triggering conditions of the differential defrost control strategies of the low-temperature heat pump is to determine whether multiple different defrost control strategies need to be used for intervention defrosting at the same time.

[0167] In this embodiment, the coordination node refers to the time for coordinating different differential defrost control strategies, so as to facilitate accurate and reliable defrost control of the low-temperature heat pump through the differential defrost control strategy.

[0168] In this embodiment, the second real-time re-check refers to re-checking the operating state of the low-temperature heat pump after the low-temperature heat pump is defrosted in coordination with the differential defrost control strategy.

[0169] In this embodiment, the state correction amount refers to the degree of correction of the defrosting performance of the low-temperature heat pump.

[0170] In this embodiment, the preset evaluation index is known in advance and is used to evaluate the current defrosting performance of the low-temperature heat pump itself.

[0171] In this embodiment, the preset requirement condition is set in advance and is a reference for measuring whether the low-temperature heat pump can resume normal defrosting, and can be adjusted.

[0172] The working principle and beneficial effects of the above technical solution are: the low-temperature heat pump is intervened in the defrost control through the obtained differential defrost control strategy, and the low-temperature heat pump is first re-checked in real time during the intervention defrost control, so as to facilitate the timely coordination of the differential defrost control strategy when multiple defrost protection conditions are triggered simultaneously. Secondly, after the low-temperature heat pump is defrosted through the differential defrost control strategy, the low-temperature heat pump is re-checked in real time to achieve an effective evaluation of the defrost performance of the low-temperature heat pump itself. Finally, when the defrost performance of the low-temperature heat pump itself meets the preset requirements, the low-temperature heat pump is dynamically switched to conventional defrost, which ensures the defrost effect of the low-temperature heat pump and ensures the stable operation of the low-temperature heat pump.

[0173] Embodiment 9:

[0174] This embodiment provides a defrost control system for a low-temperature heat pump. Figure 3 As shown, including:

[0175] A parameter monitoring module, used to determine the defrost protection condition based on the configuration parameters of the low-temperature heat pump, and to monitor the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment of the low-temperature heat pump in real time;

[0176] A control strategy determination module, used to determine the defrost intervention node for the low-temperature heat pump based on the defrost protection condition, and to determine the differential defrost control strategy for the low-temperature heat pump based on the operating parameters and environmental parameters at different times;

[0177] The defrost control module is used to perform intervention defrost control on the low-temperature heat pump according to the defrost intervention node based on the differential defrost control strategy, and dynamically switch the low-temperature heat pump to conventional defrost after the intervention defrost control ends.

[0178] The working principle and beneficial effects of the above technical scheme are as follows: by determining the defrost protection conditions of the low-temperature heat pump, the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment, reliable data support is provided for determining the differential defrost control strategy for the low-temperature heat pump; secondly, the defrost intervention node of the low-temperature heat pump is locked through the defrost protection conditions, so that when intervention is needed, timely intervention defrost control of the low-temperature heat pump is carried out, thereby ensuring the timeliness of defrosting; at the same time, accurate and effective determination of the differential defrost control strategy of the low-temperature heat pump under different conditions is achieved according to the operating parameters and environmental parameters, thereby facilitating comprehensive response to various faults and ensuring the reliability of defrosting; finally, intervention defrost control is carried out on the low-temperature heat pump according to the differential defrost control strategy and the defrost intervention node, and the low-temperature heat pump is dynamically switched to conventional defrost after the intervention defrost control is completed, thereby improving the thoroughness of frost removal, ensuring the defrost effect of the low-temperature heat pump, and ensuring the stable operation of the low-temperature heat pump.

[0179] Embodiment 10:

[0180] Based on Example 9, this embodiment provides a defrost control system for a low-temperature heat pump, and a parameter monitoring module, including:

[0181] A request unit, used to obtain configuration parameters of the low-temperature heat pump, and generate an access index based on the configuration parameters, and at the same time, obtain an access requirement based on the management terminal, and associate the access index with the access requirement to obtain a database access request;

[0182] A data retrieval unit, configured to traverse a database in a server based on a database access request, and extract defrosting influencing factors and historical operating parameters of a low-temperature heat pump based on the traversal result, wherein the historical operating parameters include a defrost protection trigger parameter;

[0183] A mapping unit, used for quantifying the defrosting influencing factors, obtaining the defrosting influencing factor index value, and mapping the defrosting influencing factor index value with the historical operating parameters at the same time based on the time series of the historical operating parameters;

[0184] The defrost protection condition determination unit is used to determine the linear relationship between the defrost influencing factor index value and the historical operating parameter based on the simultaneous mapping result, and determine the defrost protection condition based on the linear relationship.

[0185] The working principle and beneficial effects of the above technical solution are: by parsing the configuration parameters of the low-temperature heat pump, the defrost influencing factors and historical operating parameters of the low-temperature heat pump can be quickly and effectively obtained according to the analysis results and access requirements, providing data support for determining the defrost protection conditions of the low-temperature heat pump; secondly, by correlating the obtained defrost influencing factor index values ​​with the historical operating parameters, the defrost protection conditions of the low-temperature heat pump can be accurately and effectively determined, thereby providing convenience and guarantee for accurate and effective defrost control of the low-temperature heat pump.

[0186] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A defrosting control method for a low-temperature heat pump, characterized in that: include: Step 1: Determine the defrost protection condition based on the configuration parameters of the low-temperature heat pump, and monitor the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment of the low-temperature heat pump in real time; Step 2: Determine the defrost intervention node for the low-temperature heat pump based on the defrost protection condition, and determine the differential defrost control strategy for the low-temperature heat pump based on the operating parameters and environmental parameters at different times; Step 3: Based on the difference defrost control strategy, the low-temperature heat pump is intervened in defrost control according to the defrost intervention node, and the low-temperature heat pump is dynamically switched to conventional defrost after the intervention defrost control ends; Wherein, in step 1, the defrost protection condition is determined based on the configuration parameters of the low-temperature heat pump, including: The configuration parameters of the low-temperature heat pump are obtained, and an access index is generated based on the configuration parameters. At the same time, the access requirement is obtained based on the management terminal, and the access index is associated with the access requirement to obtain a database access request; Traversing the database in the server based on the database access request, and extracting defrosting influencing factors and historical operating parameters of the low-temperature heat pump based on the traversal results, wherein the historical operating parameters include defrost protection trigger parameters; Quantify the defrosting influencing factors to obtain the defrosting influencing factor index value, and map the defrosting influencing factor index value and the historical operating parameters at the same time based on the time series of the historical operating parameters; Determine the linear relationship between the defrost influencing factor index value and the historical operating parameter based on the simultaneous mapping result, and determine the defrost protection condition based on the linear relationship; Based on the mapping results at the same time, the linear relationship between the defrosting influencing factor index value and the historical operating parameters is determined, including: Bind the defrosting influencing factor index values ​​at different times with the simultaneous mapping results of the historical operating parameters, construct a control group, and determine the relative changes of the historical operating parameters with the defrosting influencing factor index values ​​at different times based on the control group; Determine the convergence condition of the historical operating parameters and the index value of the defrosting influencing factor based on the relative change, and obtain the linear relationship between the index value of the defrosting influencing factor and the historical operating parameters based on the convergence condition; Based on the linear relationship, the defrost protection conditions of the low-temperature heat pump under different conditions are obtained, and the defrost protection conditions of the low-temperature heat pump under different conditions are recorded and saved; Wherein, in step 2, determining the defrost intervention node for the low-temperature heat pump based on the defrost protection condition includes: Obtain the obtained defrost protection conditions, and decompose the defrost protection conditions into dimensions to obtain the defrost protection parameters of the low-temperature heat pump in each dimension; Based on the active intervention requirement, the target parameter difference between the defrost intervention and the defrost protection parameter is determined, and based on the target parameter difference, the defrost intervention node of the low-temperature heat pump in each dimension is obtained; Perform the same-level multi-point trigger adaptation for the defrost intervention nodes in different dimensions, and deploy them in the main control center based on the same-level multi-point trigger adaptation results; Wherein, in step 2, the differential defrosting control strategy for the low-temperature heat pump is determined based on the operating parameters and environmental parameters at different times, including: The obtained operating parameters and environmental parameters of the low-temperature heat pump at different times are obtained, and based on the data characteristics of the operating parameters and the environmental parameters, the operating characteristics of the low-temperature heat pump and the environmental characteristics of the environment in which the low-temperature heat pump is located are determined respectively; Based on the preset control priority, the different defrost control strategies for low-temperature heat pumps in different states are matched according to the operating characteristics and environmental characteristics, including: Determine a water temperature value of the low-temperature heat pump according to the operating characteristics, and when the water temperature value is less than a preset temperature threshold, iteratively adjust the flow and load at the end of the low-temperature water pump based on the first single adjustment amount until the water temperature is greater than the preset temperature threshold; When the water temperature value of the low-temperature heat pump meets the preset temperature threshold and the outlet water temperature of the low-temperature heat pump is less than the defrost protection threshold, the compressor frequency of the low-temperature water pump is reduced based on the second single adjustment amount, and the speed state of the circulating water pump is monitored in real time based on the reduction result; The compressor frequency is negatively feedback-regulated based on the speed state of the circulating water pump until the outlet water temperature of the low-temperature heat pump is greater than the defrost protection threshold; When the water temperature value of the low-temperature heat pump meets the preset temperature threshold and the outlet water temperature of the low-temperature heat pump is higher than the defrost protection threshold, the pressure jump value of the low-temperature heat pump is obtained, and when the pressure jump value is greater than the preset pressure threshold, the compressor frequency of the low-temperature water pump is reduced based on the third single adjustment amount, and the fan is synchronously controlled to start the preset time; Based on the matching results, the differential defrosting control strategies corresponding to the operating parameters and environmental parameters at different times are obtained.

2. A defrosting control method for a low-temperature heat pump according to claim 1, characterized in that: In step 1, the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment of the low-temperature heat pump are monitored in real time, including: Acquire a defrost-related component of the low-temperature heat pump, and determine a first sensor to be deployed and a deployment position of the first sensor to be deployed based on operation characteristics of the defrost-related component; Based on the deployment position, the first sensor to be transmitted is deployed with guidance, and at the same time, the monitoring dimension of the working environment of the low-temperature heat pump is determined, and the second sensor to be deployed is determined based on the monitoring dimension; Deploy the second sensor to be deployed based on the environmental monitoring requirement, and control the first sensor to be deployed and the second sensor to be deployed to monitor the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment of the low-temperature heat pump in real time based on the deployment result; Add time tags to the operating parameters and environmental parameters monitored in real time, and transmit the operating parameters and environmental parameters back to the management terminal based on the added results.

3. A defrosting control method for a low-temperature heat pump according to claim 2, characterized in that: Based on the added results, the operating parameters and environment parameters are sent back to the management terminal, including: Obtain the obtained operating parameters and environmental parameters, and visualize the operating parameters and environmental parameters in a rectangular coordinate system based on the time series; Determine outlier sample points based on the visualization results and remove them. At the same time, determine the upper and lower sample values ​​of the outlier sample points, and determine the change trends of operating parameters and environmental parameters based on the visualization results. The theoretical value of the location of the outlier sample point is determined based on the change trend and the upper and lower sample values, and the outlier sample point is replaced based on the theoretical value.

4. The defrosting control method of a low-temperature heat pump according to claim 1, characterized in that: In step 3, based on the difference defrost control strategy, the low-temperature heat pump is intervened in defrost control according to the defrost intervention node, and the low-temperature heat pump is dynamically switched to conventional defrost after the intervention defrost control ends, including: Obtain the obtained differential defrost control strategy, and perform intervention defrost control on the low-temperature heat pump based on the defrost intervention node; Performing a first real-time re-inspection on the low-temperature heat pump based on the intervention defrost control result, and obtaining a multi-dimensional state change parameter of the low-temperature heat pump based on the first real-time re-inspection result; Subordinate matching is performed between the multi-dimensional state change parameter and the triggering condition of the differential defrost control strategy of the low-temperature heat pump, and the coordination node of the differential defrost control strategy is determined based on the subordinate matching result; Determine the execution logic of the differential defrost control strategy based on the collaborative node, and perform intervention defrost control on the low-temperature heat pump based on the execution logic; Performing a second real-time recheck on the low-temperature heat pump based on the intervention defrost control result, and determining a state correction amount of the low-temperature heat pump based on the second real-time recheck result; The state correction amount is analyzed based on the preset evaluation index to determine the no-intervention defrost performance evaluation value of the low-temperature heat pump, and when the no-intervention defrost performance evaluation value is greater than the preset requirement, the intervention defrost control of the low-temperature heat pump is terminated and the low-temperature heat pump is dynamically switched to conventional defrost.

5. A defrost control system for a low-temperature heat pump, used to execute a defrost control method for a low-temperature heat pump according to any one of claims 1 to 4, characterized in that: include: A parameter monitoring module, used to determine the defrost protection condition based on the configuration parameters of the low-temperature heat pump, and to monitor the operating parameters of the low-temperature heat pump and the environmental parameters of the working environment of the low-temperature heat pump in real time; A control strategy determination module, used to determine the defrost intervention node for the low-temperature heat pump based on the defrost protection condition, and to determine the differential defrost control strategy for the low-temperature heat pump based on the operating parameters and environmental parameters at different times; The defrost control module is used to perform intervention defrost control on the low-temperature heat pump according to the defrost intervention node based on the differential defrost control strategy, and dynamically switch the low-temperature heat pump to conventional defrost after the intervention defrost control ends.

6. A defrost control system for a low-temperature heat pump according to claim 5, characterized in that: Parameter monitoring module, including: A request unit, used to obtain configuration parameters of the low-temperature heat pump, and generate an access index based on the configuration parameters, and at the same time, obtain an access requirement based on the management terminal, and associate the access index with the access requirement to obtain a database access request; A data retrieval unit, configured to traverse a database in a server based on a database access request, and extract defrosting influencing factors and historical operating parameters of a low-temperature heat pump based on the traversal result, wherein the historical operating parameters include a defrost protection trigger parameter; A mapping unit, used for quantifying the defrosting influencing factors, obtaining the defrosting influencing factor index value, and mapping the defrosting influencing factor index value with the historical operating parameters at the same time based on the time series of the historical operating parameters; The defrost protection condition determination unit is used to determine the linear relationship between the defrost influencing factor index value and the historical operating parameter based on the simultaneous mapping result, and determine the defrost protection condition based on the linear relationship.

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