Frequency conversion cabinet anti-condensation temperature control method and system based on temperature feedback

Abstract

The invention discloses a frequency conversion cabinet anti-condensation temperature control method and system based on temperature feedback, and is used for solving the problems that the adaptability to different environment temperatures and different working states of equipment is poor and accurate temperature control cannot be realized during existing anti-condensation. According to the method, the current temperature and humidity of the frequency conversion cabinet are detected, and the corresponding condensation temperature is calculated; calculating a current temperature difference value between the current temperature and the condensation temperature in real time; determining the temperature state of the frequency conversion cabinet according to the magnitude relationship between the current temperature difference value and a plurality of preset temperature difference protection values; and executing a corresponding temperature control strategy on the frequency conversion cabinet based on the influence of the heat production state of the frequency conversion cabinet on the temperature state. According to the method, flexible multi-section temperature control is achieved, the energy-saving effect is achieved while effective adjustment of the temperature is guaranteed, energy waste is reduced, the operation stability of equipment in the severe environment is improved, and the failure rate of the equipment is reduced.

Description

Technical Field

[0001] This application relates to the field of temperature control, and in particular to a method and system for preventing condensation in frequency converter cabinets based on temperature feedback. Background Technology

[0002] In modern industrial production and daily life, the use of various electronic and mechanical equipment is becoming increasingly widespread. During the operation of these devices, changes in external temperature and humidity can affect them, causing condensation inside and leading to equipment malfunctions.

[0003] Currently, to avoid condensation problems in equipment, the temperature and humidity of the equipment are typically monitored. The heater is activated when the temperature and humidity reach certain limits and deactivated when they fall below a certain threshold. This method requires frequent switching of the heater, resulting in energy waste. Furthermore, it has poor adaptability to different ambient temperatures and varying operating conditions of the equipment, failing to achieve precise temperature control. Consequently, the condensation problem inside the equipment may not be effectively resolved, affecting the stable operation and lifespan of the equipment. Summary of the Invention

[0004] This application provides a temperature control method and system for preventing condensation in frequency converter cabinets based on temperature feedback, which solves the problem that existing anti-condensation methods have poor adaptability to different ambient temperatures and different operating states of equipment, and cannot achieve precise temperature control.

[0005] This application provides an embodiment of a temperature feedback-based method for preventing condensation in a frequency converter cabinet, comprising: Detect the current temperature and humidity of the frequency converter cabinet and calculate the corresponding condensation temperature; Calculate the current temperature difference between the current temperature and the condensation temperature in real time; The temperature state of the frequency converter cabinet is determined based on the relationship between the current temperature difference and multiple preset temperature difference protection values. Based on the influence of the heat generation state of the frequency converter cabinet on the temperature state, a corresponding temperature control strategy is implemented for the frequency converter cabinet.

[0006] In one example, the implementation of the corresponding temperature control strategy for the frequency converter cabinet includes: Based on the configuration of the frequency converter cabinet, it is determined that at least one of the following methods—multi-segment temperature control, analog temperature control, and communication temperature control—is used for temperature control.

[0007] In one example, when using multi-segment temperature control, the temperature state of the inverter cabinet is determined based on the relationship between the current temperature difference and multiple preset temperature difference protection values. Based on the influence of the inverter cabinet's heat generation state on the temperature state, a corresponding temperature control strategy is implemented for the inverter cabinet, including: When the current temperature difference is greater than the maximum temperature difference protection value among the preset multiple temperature difference protection values, it is determined that there is no risk of condensation in the temperature state of the frequency converter cabinet, and the temperature of the frequency converter cabinet is not controlled. When the current temperature difference is less than the minimum temperature difference protection value among the preset multiple temperature difference protection values, it is determined that there is a risk of condensation in the temperature state of the frequency converter cabinet, a condensation warning signal is sent, and the temperature of the frequency converter cabinet is controlled to move away from the condensation temperature. When the current temperature difference is greater than the minimum temperature difference protection value and less than the maximum temperature difference protection value, it is determined that the temperature state of the frequency converter cabinet has a risk trend, and the temperature of the frequency converter cabinet is controlled to move away from the condensation temperature. When the current temperature difference is less than a preset threshold, it is determined that the frequency converter cabinet has condensed, a condensation fault signal is sent, and the temperature of the frequency converter cabinet is controlled by heating to move away from the condensation temperature. When the current temperature is lower than the condensation temperature and the frequency converter cabinet is in a heat-generating state, a condensation fault signal is sent, and the temperature of the frequency converter cabinet is controlled to move away from the condensation temperature by heating.

[0008] In one example, controlling the temperature of the frequency converter cabinet away from the condensation temperature includes: From the plurality of temperature difference protection values, determine the closest temperature difference protection value that is larger than the current temperature difference value; When controlling the temperature of the frequency converter cabinet to move away from the condensation temperature, the current temperature difference is kept greater than the sum of the nearest temperature difference protection value and the preset action difference value; the magnitude of the action difference value is set based on the difference between the multiple temperature difference protection values.

[0009] In one example, the implementation of a corresponding temperature control strategy for the frequency converter cabinet based on the influence of its heat generation state on the temperature state includes: Based on the heat generation status of the frequency converter cabinet, determine whether the frequency converter cabinet is currently generating heat; If so, the frequency converter cabinet will be heated or left inactive depending on its temperature status. If not, then depending on the temperature status of the inverter cabinet, the inverter cabinet will be cooled or left inactive.

[0010] In one example, when using analog temperature control, the temperature state of the frequency converter cabinet is determined based on the relationship between the current temperature difference and multiple preset temperature difference protection values. Based on the influence of the frequency converter cabinet's heat generation state on the temperature state, a corresponding temperature control strategy is implemented for the frequency converter cabinet, including: Based on the preset multiple temperature difference protection values, the current temperature difference value, and the preset maximum value of analog output, calculate the analog quantity corresponding to the current temperature difference value; Under the corresponding heat generation state of the frequency converter cabinet, the corresponding analog signal is continuously output according to the change of the current temperature difference of the frequency converter cabinet to control the temperature of the frequency converter cabinet.

[0011] In one example, when using communication-based temperature control, the temperature state of the frequency converter cabinet is determined based on the relationship between the current temperature difference and multiple preset temperature difference protection values. Based on the influence of the frequency converter cabinet's heat generation state on the temperature state, a corresponding temperature control strategy is implemented for the frequency converter cabinet, including: Based on the preset multiple temperature difference protection values, the current temperature difference, and the preset maximum temperature output value, calculate the temperature output corresponding to the current temperature difference; Under the corresponding heat generation state of the frequency converter cabinet, the temperature output communication signal is continuously output according to the change of the current temperature difference of the frequency converter cabinet to control the temperature of the frequency converter cabinet.

[0012] In one example, the method further includes: When the current temperature difference is less than a preset threshold, it is determined that the frequency converter cabinet has condensed, a condensation fault signal is sent, and the frequency converter cabinet is heated according to the maximum analog signal or the maximum temperature output communication signal.

[0013] In one example, the method further includes: The current temperature difference is less than or equal to the maximum temperature difference protection value among the preset multiple temperature difference protection values.

[0014] This application provides an embodiment of a variable frequency cabinet anti-condensation temperature control system based on temperature feedback, comprising: The detection module detects the current temperature and humidity of the frequency converter cabinet and calculates the corresponding condensation temperature. The calculation module calculates the current temperature difference between the current temperature and the condensation temperature in real time. The determination module determines the temperature state of the frequency converter cabinet based on the relationship between the current temperature difference value and multiple preset temperature difference protection values. The temperature control module implements a corresponding temperature control strategy for the frequency converter cabinet based on the influence of the heat generation state of the frequency converter cabinet on the temperature state.

[0015] This application provides a method and system for preventing condensation in frequency converter cabinets based on temperature feedback, which can achieve the following beneficial effects: The device's current temperature status is dynamically calculated by the temperature difference between the condensation temperature and the current temperature. The heating / cooling mode is automatically switched, and the temperature control limits are determined based on multiple temperature difference protection values. This achieves multi-segment temperature control corresponding to different temperature control strategies, ensuring effective temperature adjustment while achieving energy savings, reducing energy waste, improving operational stability and efficiency in harsh environments, reducing equipment failure rates, extending equipment lifespan, lowering maintenance costs, and enhancing system stability and reliability. Furthermore, different temperature control methods can be adopted depending on the equipment and scenario, making it more flexible and adaptable. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The accompanying drawings described herein are used to provide a further understanding of this application and constitute a part of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application. In the accompanying drawings: Figure 1 Flowchart of a temperature control method for preventing condensation in a frequency converter cabinet based on temperature feedback, provided in an embodiment of this application; Figure 2 A schematic diagram of the structure of a variable frequency cabinet anti-condensation temperature control system based on temperature feedback provided in an embodiment of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] Figure 1 The flowchart of the temperature control method for preventing condensation in a frequency converter cabinet based on temperature feedback provided in this application embodiment specifically includes the following steps: S101: Detect the current temperature and humidity of the frequency converter cabinet and calculate the corresponding condensation temperature.

[0019] Condensation temperature refers to the temperature at which air cools to saturation under constant water vapor content and air pressure. At this temperature, water vapor begins to condense into dew droplets. During equipment operation, condensation can lead to problems such as damage to electrical insulation, corrosion and aging, and even equipment malfunctions and accidents, posing numerous safety hazards. Furthermore, condensation can affect the service life of equipment and increase maintenance costs.

[0020] This application uses a frequency converter cabinet as an example to illustrate the anti-condensation temperature control method. It is understood that this method is applicable to various equipment requiring anti-condensation in production and daily life, and is not limited to frequency converter cabinets.

[0021] In one embodiment, the current temperature and humidity of the frequency converter cabinet can be collected using temperature and humidity sensors to calculate the condensation temperature. Depending on the application scenario, sensors with different levels of accuracy, stability, and cost can be used to meet the needs of different scenarios.

[0022] In one embodiment, the condensation temperature can be calculated using existing methods, such as the Magnus formula, the Magnus-Tetens approximation, or the simplified approximation method. This application does not limit the method to these methods.

[0023] S102: Calculate the current temperature difference between the current temperature and the condensation temperature in real time.

[0024] The current temperature represents the real-time temperature of the device at the current moment. The current temperature may be greater than, less than, or equal to the condensation temperature. The current temperature difference represents the temperature difference between the current temperature and the condensation temperature. When the current temperature equals the condensation temperature, the current temperature difference is at its minimum of 0.

[0025] S103: Determine the temperature state of the frequency converter cabinet based on the relationship between the current temperature difference and multiple preset temperature difference protection values.

[0026] Understandably, the closer the current temperature is to the condensation temperature, the smaller the current temperature difference, indicating a greater risk of condensation on the equipment; conversely, the further the current temperature is from the condensation temperature, the larger the current temperature difference, indicating a lower risk of condensation on the equipment.

[0027] Based on this, the temperature difference protection value represents the safe protection value of the distance between a preset temperature and the condensation temperature. The preset temperature difference protection values ​​are of different magnitudes, each representing a different safe distance from the condensation temperature.

[0028] Specifically, when setting the temperature difference protection value, multiple temperature difference protection values ​​can be set according to actual process needs or equipment requirements to implement different temperature control strategies.

[0029] For example, if the condensation temperature is 9℃, and the temperature difference protection values ​​are 1℃, 3℃, and 5℃ away from the condensation temperature, then the temperature range corresponding to the temperature difference protection value of 1℃ is 8~9℃ and 9~10℃, the temperature range corresponding to the temperature difference protection value of 3℃ is 6~9℃ and 9~12℃, and the temperature range corresponding to the temperature difference protection value of 5℃ is 4~9℃ and 9~14℃.

[0030] In this embodiment of the application, by comparing the current temperature difference with the magnitude of multiple temperature difference protection values, the current temperature state of the frequency converter cabinet can be determined. The temperature state represents a more precise temperature range of the equipment obtained by dividing the range, which facilitates precise temperature control of the frequency converter cabinet in the future.

[0031] S104: Based on the influence of the heat generation state of the frequency converter cabinet on the temperature state, implement a corresponding temperature control strategy for the frequency converter cabinet.

[0032] The heat generation status of the equipment indicates whether the equipment is currently generating heat. During equipment use, if it is under high voltage or operating conditions, it may generate heat; otherwise, if the equipment is not running, it may not generate heat.

[0033] The heat generation status of equipment affects the temperature; if the equipment is generating heat, the temperature will automatically rise. Therefore, when controlling the temperature of equipment, both the temperature status and the heat generation status must be considered.

[0034] In one embodiment, when controlling the temperature of the frequency converter cabinet, equipment such as air conditioners and heaters can be used for temperature control, but this application does not limit the specific method.

[0035] In this embodiment, the current temperature state of the device is dynamically calculated by the temperature difference between the condensation temperature and the current temperature. The heating / cooling mode of the device is automatically switched, and the temperature control limit is determined based on the setting of multiple temperature difference protection values. This realizes multi-segment temperature control corresponding to different temperature control strategies. While ensuring effective temperature adjustment, it also has energy-saving effects, reduces energy waste, improves the operational stability and efficiency of the device in harsh environments, helps to reduce the failure rate of the device, extends the working life of the device, reduces maintenance costs, and improves the stability and reliability of the system.

[0036] Furthermore, implementing corresponding temperature control strategies for the frequency converter cabinet includes: determining, based on the settings of the frequency converter cabinet, to use at least one of the following methods for temperature control: multi-segment temperature control, analog temperature control, and communication temperature control.

[0037] Because the parameters of equipment such as frequency converter cabinets vary, the supported temperature control methods may also differ, and the requirements of the application scenarios also vary. Therefore, based on the settings of the frequency converter cabinet, at least one feasible method can be freely selected for temperature control. Depending on the equipment and the scenario, different temperature control methods can be adopted, making it more flexible and applicable.

[0038] The following is a detailed explanation of these three temperature control methods.

[0039] When using multi-segment temperature control, the temperature control strategy includes: First, if the current temperature difference is greater than the maximum temperature difference protection value among the preset multiple temperature difference protection values, it means that the current temperature is far from the condensation temperature and no intervention is needed. In this case, it is determined that there is no risk of condensation in the temperature state of the frequency converter cabinet and the temperature of the frequency converter cabinet is not controlled. Second, when the current temperature difference is less than the minimum temperature difference protection value among the preset multiple temperature difference protection values, it indicates that the current temperature is very close to the condensation temperature and has exceeded the minimum temperature difference protection value. It is determined that there is a risk of condensation in the temperature state of the frequency converter cabinet, a condensation warning signal is sent, and the temperature of the frequency converter cabinet is controlled to move away from the condensation temperature by heating or cooling. Third, if the current temperature difference is greater than the minimum temperature difference protection value but less than the maximum temperature difference protection value, it indicates that the current temperature is a certain distance from the condensation temperature, but intervention is still required. In this case, it is determined that the temperature status of the frequency converter cabinet has a risk trend, and the temperature of the frequency converter cabinet is controlled to move away from the condensation temperature by heating or cooling. When the current temperature difference is less than the preset threshold, it indicates that the current temperature is very close to the condensation temperature. It can be determined that the frequency converter cabinet has condensed, and a condensation fault signal is sent. It is determined that the frequency converter cabinet will stop operating due to the fault. The temperature of the frequency converter cabinet will be controlled by heating to move away from the condensation temperature before it can continue to operate. The preset threshold can be set as needed, such as 1℃.

[0040] If the current temperature is lower than the condensation temperature and the frequency converter cabinet is in a heat-generating state, it means that the frequency converter cabinet is likely to gradually approach the condensation temperature through self-heating. At this time, it is not suitable to use cooling to control the temperature. In this case, a condensation fault signal is sent to confirm that the frequency converter cabinet is no longer running due to the fault. The current temperature is controlled to be higher than the condensation temperature by heating, so that it is further away from the condensation temperature and then continues to run.

[0041] In one embodiment, controlling the temperature of the frequency converter cabinet away from the condensation temperature includes heating the frequency converter cabinet to raise its temperature and cooling the frequency converter cabinet to lower its temperature. Based on the relationship between the current temperature and the condensation temperature, it can be determined whether to heat or cool the frequency converter cabinet to move it away from the condensation temperature.

[0042] Further, controlling the temperature of the variable frequency cabinet away from the condensation temperature includes: determining the closest temperature difference protection value that is greater than the current temperature difference from multiple temperature difference protection values; when controlling the temperature of the variable frequency cabinet away from the condensation temperature, until the current temperature difference is greater than the sum of the closest temperature difference protection value and the preset action difference.

[0043] Among them, the magnitude of the action difference is set based on the difference between multiple temperature difference protection values. For example, the closest temperature difference protection value + the action difference < the second closest temperature difference protection value.

[0044] This method limits the limit of heating or cooling the variable frequency cabinet. When controlling the temperature of the variable frequency cabinet, it is heated or cooled to exceed the closest temperature difference protection value until it exceeds the preset action difference. In this way, the condensation risk or condensation trend can be eliminated with limited resources, avoiding excessive heating or cooling, achieving an energy-saving effect. At the same time, through the magnitude of the action difference, it also ensures that there is an adequate safety distance between the current temperature and the condensation temperature.

[0045] In one embodiment, the above multi-segment temperature control method is illustrated in detail with examples.

[0046] Detect the current temperature of the variable frequency cabinet as T1, the humidity as Q1, and calculate the condensation temperature as T2.

[0047] Based on the current temperature T1 and the condensation temperature T2, obtain the current temperature difference T3.

[0048] Preset two temperature difference protection differences A1, A2 and set the action difference A3, where A2 > A1.

[0049] Based on this, the temperature control strategy includes: 1. When T1 > T2, and when T3 > A2, it means there is no condensation risk, so no temperature control is required at this time; 2. When T1 > T2, and when A1 < T3 < A2, it means there is a risk trend, so the current temperature needs to be increased, heat the variable frequency cabinet until T3 > (A2 + A3), then stop heating; 3. When T1 > T2, and when T3 < A1, it means there is a condensation risk, so the current temperature is already close to the condensation temperature, send a condensation warning signal, and heat the variable frequency cabinet until T3 > (A1 + A3), then execute step 2; 4. When the difference between T1 and T2 is less than the preset threshold, the current device has condensed, send a condensation fault signal, the variable frequency system cannot be started due to the fault, and at the same time execute heating until T3 > A3, then execute step 3; 5. When T1 < T2, determine whether the device is in a heat generation state. If the device is in a heat generation state, it indicates that the device is likely to gradually approach the dew condensation temperature through self-heating, and then perform the fault action in step 4. 6. When T1 < T2, if the device is not in a heat generation state, and when T3 > A2, it means there is no dew condensation risk, the current temperature is relatively low, and no temperature control is required. 7. When T1 < T2, if the device is not in a heat generation state, and when A1 < T3 < A2, it indicates a risk trend, then the current temperature needs to be cooled. Perform cooling until T3 > (A2 + A3), and then stop cooling. 8. When T1 < T2, if the device is not in a heat generation state, and when T3 < A1, it indicates a dew condensation risk, then the current temperature is already approaching the dew condensation temperature. Send a dew condensation warning signal and perform cooling until T3 > (A1 + A3), and then perform step 7.

[0050] In one embodiment, in the case of adopting analog temperature control or communication temperature control, the temperature control strategy first needs to perform a judgment action, including: determining whether the frequency conversion cabinet is currently generating heat according to the heat generation state of the frequency conversion cabinet; if so, heating the frequency conversion cabinet or not performing any action according to the temperature state of the frequency conversion cabinet; if not, cooling the frequency conversion cabinet or not performing any action according to the temperature state of the frequency conversion cabinet. That is, the switching of the heating or cooling state is determined by whether the frequency conversion cabinet generates heat.

[0051] In the case of adopting analog temperature control, based on the preliminary judgment action, the temperature control strategy further includes: calculating the analog quantity corresponding to the current temperature difference according to a plurality of preset temperature difference protection values, the current temperature difference, and the preset maximum analog output value; under the corresponding heat generation state of the frequency conversion cabinet, continuously outputting a corresponding changing analog quantity signal according to the change of the current temperature difference of the frequency conversion cabinet to control the temperature of the frequency conversion cabinet.

[0052] Specifically, the calculation formula for the analog quantity corresponding to the current temperature difference can be expressed as formula one: M = K / (An - A1) * (An - T3) Where, M represents the analog output, K represents the maximum analog output value (such as 20 mA), A1 represents the minimum temperature difference protection value among a plurality of temperature difference protection values, An represents the maximum temperature difference protection value among a plurality of temperature difference protection values, and T3 represents the current temperature difference.

[0053] To ensure that M is not negative, the current temperature difference needs to be less than or equal to the maximum temperature difference protection value among the preset plurality of temperature difference protection values.

[0054] In one embodiment, when the current temperature difference is less than a preset threshold, it indicates that the current temperature is very close to the condensation temperature, and it can be determined that the frequency converter cabinet has condensed. Then, a condensation fault signal is sent to determine that the frequency converter cabinet cannot operate, and the frequency converter cabinet is heated according to the maximum analog signal. The preset threshold can be set as needed, such as 1℃.

[0055] In one embodiment, the above-described analog temperature control method is illustrated in detail.

[0056] The current temperature of the frequency converter cabinet is T1, the humidity is Q1, and the condensation temperature is calculated to be T2.

[0057] Based on the current temperature T1 and the condensation temperature T2, the current temperature difference T3 is obtained.

[0058] Two temperature difference protection values, A1 and A2, are preset, and an action difference value, A3, is set, where A2 > A1.

[0059] Based on this, temperature control strategies include: 1. Determine the heat generation status of the equipment. If the equipment generates heat, perform heating operation or leave it inactive to prevent condensation from occurring due to temperature drop. If the equipment does not generate heat, perform cooling operation or leave it inactive to prevent condensation from occurring due to temperature rise. 2. Calculate the analog output M = K / (A2 - A1) * (A2 - T3), where K represents the maximum value of the analog output, which can be assumed to be 20mA, and T3 <= A2. 3. Based on steps 1 and 2, continuously output the analog signal M and switch between heating and cooling states; 4. When the difference between T1 and T2 is less than the preset threshold, the current equipment has condensed and a condensation fault signal is issued. The frequency converter system cannot be started, and a heating signal is output at the same time to heat the equipment by outputting the maximum analog signal.

[0060] In the case of using communication temperature control, based on the prior judgment action, the temperature control strategy also includes: calculating the temperature output corresponding to the current temperature difference according to multiple preset temperature difference protection values, the current temperature difference, and the preset maximum temperature output value; and continuously outputting a corresponding temperature output communication signal according to the change of the current temperature difference of the frequency converter cabinet under the corresponding heat generation state of the frequency converter cabinet, so as to control the temperature of the frequency converter cabinet.

[0061] Specifically, the formula for calculating the communication signal corresponding to the current temperature difference can be expressed as Formula 2: N = L / (An - A1) * (An - T3) Where N represents the temperature output, L represents the maximum temperature output (such as the temperature corresponding to An), A1 represents the minimum temperature difference protection value among multiple temperature difference protection values, An represents the maximum temperature difference protection value among multiple temperature difference protection values, and T3 represents the current temperature difference value.

[0062] To ensure that N is not negative, the current temperature difference must be less than or equal to the maximum temperature difference protection value among the preset multiple temperature difference protection values.

[0063] In one embodiment, when the current temperature difference is less than a preset threshold, it indicates that the current temperature is very close to the condensation temperature, and it can be determined that the frequency converter cabinet has condensed. Then, a condensation fault signal is sent to determine that the frequency converter cabinet cannot operate, and a communication signal is output to heat the frequency converter cabinet according to the maximum temperature. The preset threshold can be set as needed, such as 1℃.

[0064] In one embodiment, the above-described temperature communication temperature control method is illustrated in detail.

[0065] The current temperature of the frequency converter cabinet is T1, the humidity is Q1, and the condensation temperature is calculated to be T2.

[0066] Based on the current temperature T1 and the condensation temperature T2, the current temperature difference T3 is obtained.

[0067] Two temperature difference protection values, A1 and A2, are preset, and an action difference value, A3, is set, where A2 > A1.

[0068] Based on this, temperature control strategies include: 1. Determine the heat generation status of the equipment. If the equipment generates heat, perform heating operation or leave it inactive to prevent condensation from occurring due to temperature drop. If the equipment does not generate heat, perform cooling operation or leave it inactive to prevent condensation from occurring due to temperature rise. 2. Calculate the temperature communication signal output N = L / (A2 - A1) * (A2 - T3), where L represents the maximum temperature output value, which can be assumed to be A2 here, and T3 <= A2 is limited; 3. Based on steps 1 and 2, continuously output temperature communication signals and switch between heating and cooling states; 4. When the difference between T1 and T2 is less than the preset threshold, the current equipment has condensed and sends a condensation fault signal. The frequency converter system cannot be started, and at the same time, a heating signal is output to heat the equipment by outputting the maximum temperature communication signal.

[0069] It should be noted that the above describes the switching control of multiple modes of heating and cooling. However, similarly, according to this method, the equipment's anti-condensation requirements can also be met by segmenting the control of different power levels of dehumidifying devices such as heaters. This is also an implementation method of the temperature control method described in this application.

[0070] The above describes a temperature control method for preventing condensation in a frequency converter cabinet based on temperature feedback, as provided in the embodiments of this application. Based on the same inventive concept, the embodiments of this application also provide a corresponding temperature control system for preventing condensation in a frequency converter cabinet based on temperature feedback, such as... Figure 2 As shown.

[0071] Figure 2 The schematic diagram of the temperature control system for anti-condensation temperature control of frequency converter cabinet based on temperature feedback provided in the embodiments of this application specifically includes: The detection module 201 detects the current temperature and humidity of the frequency converter cabinet and calculates the corresponding condensation temperature. Calculation module 202 calculates the current temperature difference between the current temperature and the condensation temperature in real time; The determination module 203 determines the temperature state of the frequency converter cabinet based on the relationship between the current temperature difference value and multiple preset temperature difference protection values. The temperature control module 204 executes a corresponding temperature control strategy for the frequency converter cabinet based on the influence of the heat generation state of the frequency converter cabinet on the temperature state.

[0072] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0073] The various embodiments in this application are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0074] The systems and methods provided in this application are one-to-one correspondences. Therefore, the system also has similar beneficial technical effects as its corresponding method. Since the beneficial technical effects of the method have been described in detail above, the beneficial technical effects of the system will not be repeated here.

[0075] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using dedicated hardware combined with computer instructions. The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0076] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0077] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for preventing condensation in a frequency converter cabinet based on temperature feedback, characterized in that, include: Detect the current temperature and humidity of the frequency converter cabinet and calculate the corresponding condensation temperature; Calculate the current temperature difference between the current temperature and the condensation temperature in real time; The temperature state of the frequency converter cabinet is determined based on the relationship between the current temperature difference and multiple preset temperature difference protection values. Based on the influence of the heat generation state of the frequency converter cabinet on the temperature state, a corresponding temperature control strategy is implemented for the frequency converter cabinet.

2. The temperature control method for preventing condensation in a frequency converter cabinet based on temperature feedback according to claim 1, characterized in that, The implementation of the corresponding temperature control strategy for the frequency converter cabinet includes: Based on the configuration of the frequency converter cabinet, it is determined that at least one of the following methods—multi-segment temperature control, analog temperature control, and communication temperature control—is used for temperature control.

3. The temperature control method for preventing condensation in a frequency converter cabinet based on temperature feedback according to claim 2, characterized in that, In the case of multi-segment temperature control, the temperature state of the inverter cabinet is determined based on the relationship between the current temperature difference and multiple preset temperature difference protection values. Based on the influence of the inverter cabinet's heat generation state on the temperature state, a corresponding temperature control strategy is implemented for the inverter cabinet, including: When the current temperature difference is greater than the maximum temperature difference protection value among the preset multiple temperature difference protection values, it is determined that there is no risk of condensation in the temperature state of the frequency converter cabinet, and the temperature of the frequency converter cabinet is not controlled. When the current temperature difference is less than the minimum temperature difference protection value among the preset multiple temperature difference protection values, it is determined that there is a risk of condensation in the temperature state of the frequency converter cabinet, a condensation warning signal is sent, and the temperature of the frequency converter cabinet is controlled to move away from the condensation temperature. When the current temperature difference is greater than the minimum temperature difference protection value and less than the maximum temperature difference protection value, it is determined that the temperature state of the frequency converter cabinet has a risk trend, and the temperature of the frequency converter cabinet is controlled to move away from the condensation temperature. When the current temperature difference is less than a preset threshold, it is determined that the frequency converter cabinet has condensed, a condensation fault signal is sent, and the temperature of the frequency converter cabinet is controlled by heating to move away from the condensation temperature. When the current temperature is lower than the condensation temperature and the frequency converter cabinet is in a heat-generating state, a condensation fault signal is sent, and the temperature of the frequency converter cabinet is controlled to move away from the condensation temperature by heating.

4. The temperature control method for preventing condensation in a frequency converter cabinet based on temperature feedback according to claim 3, characterized in that, Controlling the temperature of the frequency converter cabinet to be away from the condensation temperature includes: From the plurality of temperature difference protection values, determine the closest temperature difference protection value that is larger than the current temperature difference value; When controlling the temperature of the frequency converter cabinet to move away from the condensation temperature, the current temperature difference is kept greater than the sum of the nearest temperature difference protection value and the preset action difference value; the magnitude of the action difference value is set based on the difference between the multiple temperature difference protection values.

5. The temperature control method for preventing condensation in a frequency converter cabinet based on temperature feedback according to claim 2, characterized in that, The method of implementing a corresponding temperature control strategy for the frequency converter cabinet based on the influence of its heat generation state on the temperature state includes: Based on the heat generation status of the frequency converter cabinet, determine whether the frequency converter cabinet is currently generating heat; If so, the frequency converter cabinet will be heated or left inactive depending on its temperature status. If not, then depending on the temperature status of the inverter cabinet, the inverter cabinet will be cooled or left inactive.

6. The temperature control method for preventing condensation in a frequency converter cabinet based on temperature feedback according to claim 5, characterized in that, When using analog temperature control, the temperature state of the frequency converter cabinet is determined based on the relationship between the current temperature difference and multiple preset temperature difference protection values. Based on the influence of the frequency converter cabinet's heat generation state on the temperature state, a corresponding temperature control strategy is implemented for the frequency converter cabinet, including: Based on the preset multiple temperature difference protection values, the current temperature difference value, and the preset maximum value of analog output, calculate the analog quantity corresponding to the current temperature difference value; Under the corresponding heat generation state of the frequency converter cabinet, the corresponding analog signal is continuously output according to the change of the current temperature difference of the frequency converter cabinet to control the temperature of the frequency converter cabinet.

7. The temperature control method for preventing condensation in a frequency converter cabinet based on temperature feedback according to claim 5, characterized in that, When using communication-based temperature control, the temperature state of the inverter cabinet is determined based on the relationship between the current temperature difference and multiple preset temperature difference protection values. Based on the influence of the inverter cabinet's heat generation state on the temperature state, a corresponding temperature control strategy is implemented for the inverter cabinet, including: Based on the preset multiple temperature difference protection values, the current temperature difference, and the preset maximum temperature output value, calculate the temperature output corresponding to the current temperature difference; Under the corresponding heat generation state of the frequency converter cabinet, the temperature output communication signal is continuously output according to the change of the current temperature difference of the frequency converter cabinet to control the temperature of the frequency converter cabinet.

8. The temperature control method for preventing condensation in a frequency converter cabinet based on temperature feedback according to claim 6 or 7, characterized in that, The method further includes: When the current temperature difference is less than a preset threshold, it is determined that the frequency converter cabinet has condensed, a condensation fault signal is sent, and the frequency converter cabinet is heated according to the maximum analog signal or the maximum temperature output communication signal.

9. The temperature control method for preventing condensation in a frequency converter cabinet based on temperature feedback according to claim 6 or 7, characterized in that, The method further includes: The current temperature difference is less than or equal to the maximum temperature difference protection value among the preset multiple temperature difference protection values.

10. A variable frequency drive cabinet anti-condensation temperature control system based on temperature feedback, characterized in that, include: The detection module detects the current temperature and humidity of the frequency converter cabinet and calculates the corresponding condensation temperature. The calculation module calculates the current temperature difference between the current temperature and the condensation temperature in real time. The determination module determines the temperature state of the frequency converter cabinet based on the relationship between the current temperature difference value and multiple preset temperature difference protection values. The temperature control module implements a corresponding temperature control strategy for the frequency converter cabinet based on the influence of the heat generation state of the frequency converter cabinet on the temperature state.

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