Variable frequency converter temperature control system, air conditioning unit and temperature control method

Abstract

The present disclosure provides a frequency converter temperature control system, an air conditioning unit and a temperature control method. In the frequency converter temperature control system, a low-temperature fluid inlet of a frequency converter module side cooling flow path is connected with a low-temperature fluid outlet of a low-temperature fluid providing flow path, and a low-temperature fluid outlet of the frequency converter module side cooling flow path is connected with a low-temperature fluid inlet of a frequency converter cabinet side cooling flow path. An ambient temperature detection device is used to detect the ambient temperature of the environment where the frequency converter is located. A control device is configured to control the low-temperature fluid flow of the low-temperature fluid providing flow path based on the ambient temperature detected by the ambient temperature detection device, so as to control the temperature of the frequency converter module side and the frequency converter cabinet side of the frequency converter. The present disclosure can realize precise linkage control of the temperature of the frequency converter module side and the frequency converter cabinet side, and can flexibly control the thermal environment of the frequency converter according to the real-time cooling load in the frequency converter. The present disclosure can well avoid the over-temperature phenomenon and condensation phenomenon of the frequency converter, and can better control the internal environment temperature of the frequency converter in the optimal working temperature range, thereby improving the working efficiency of the frequency converter.

Description

Technical Field

[0001] The present disclosure relates to the technical field of frequency converters, and in particular to a frequency converter temperature control system, an air conditioning unit, and a temperature control method. Background

[0002] A frequency converter is a power control device that applies frequency conversion technology and microelectronics technology to control an AC motor by changing the frequency of the working power supply of the motor, and is a core component of a variable frequency speed control system. With the increasing degree of industrial automation, frequency converters have been more and more widely used in the fields of industrial control and daily life. Due to the characteristics of high integration, high frequency, high voltage and high speed of the core circuit modules of the frequency converter, it generates a large amount of heat during operation.

[0003] Once the frequency converter exceeds the normal operating temperature range, the performance of electronic components will degrade, affecting the working effect of the frequency converter. If it works at an abnormal temperature for a long time, the service life of the frequency converter will be affected, and even serious consequences such as explosion and burnout may be caused. In the related art, although some temperature control measures have been adopted, the cooling capacity is constant, and accurate coordinated control cannot be performed on the frequency converter module side and the frequency converter cabinet side, and unreasonable temperature control still exists. Summary of the Invention

[0004] In view of this, in order to solve the technical problems in the prior art that the temperature control of the frequency converter has constant cooling capacity, cannot perform accurate coordinated control on the frequency converter module side and the frequency converter cabinet side, and still has unreasonable temperature control, the present disclosure provides a frequency converter temperature control system, an air conditioning unit, and a temperature control method.

[0005] According to a first aspect of the embodiments of the present disclosure, a frequency converter temperature control system is provided. The frequency converter temperature control system includes a low-temperature fluid supply flow path, a frequency converter module side cooling flow path, and a frequency converter cabinet side cooling flow path. The low-temperature fluid inlet of the frequency converter module side cooling flow path is connected to the low-temperature fluid outlet of the low-temperature fluid supply flow path, and the low-temperature fluid outlet of the frequency converter module side cooling flow path is in communication with the low-temperature fluid inlet of the frequency converter cabinet side cooling flow path;

[0006] The frequency converter temperature control system further includes an ambient temperature detection device and a control device, wherein the ambient temperature detection device is configured to detect the ambient temperature of the environment where the frequency converter is located;

[0007] The control device is configured to control the flow rate of the low-temperature fluid in the low-temperature fluid supply flow path based on the ambient temperature detected by the ambient temperature detection device, so as to perform temperature control on the frequency converter module side and the frequency converter cabinet side of the frequency converter.

[0008] In an optional embodiment, the frequency converter temperature control system includes a cryogenic fluid temperature detection device, which is disposed in the cryogenic fluid supply path and is used to detect the cryogenic fluid temperature in the cryogenic fluid supply path.

[0009] The control device is configured to control the flow rate of the cryogenic fluid in the flow path based on the cryogenic fluid temperature detected by the cryogenic fluid temperature detection device and the ambient temperature detected by the ambient temperature detection device, so as to perform temperature control on the inverter module side and the inverter cabinet side of the inverter.

[0010] In one optional implementation,

[0011] The cryogenic fluid supply path includes a first flow path, the first flow path including a first variable frequency pump; the control device is configured to control the cryogenic fluid flow rate of the first flow path by controlling the frequency of the first variable frequency pump based on the ambient temperature detected by the ambient temperature detection device; and / or,

[0012] The cryogenic fluid supply path includes a second flow path, and the second flow path includes a second variable frequency pump; the control device is configured to control the cryogenic fluid flow rate of the second flow path by controlling the frequency of the second variable frequency pump based on the cryogenic fluid temperature detected by the cryogenic fluid temperature detection device.

[0013] In an optional embodiment, the inverter temperature control system includes a cryogenic fluid collection device. The cryogenic fluid outlet of the inverter module-side cooling flow path is connected to the cryogenic fluid inlet of the inverter cabinet-side cooling flow path through the cryogenic fluid collection device. The cryogenic fluid outlet of the inverter module-side cooling flow path is connected to the first cryogenic fluid inlet of the cryogenic fluid collection device, and the first cryogenic fluid outlet of the cryogenic fluid collection device is connected to the cryogenic fluid inlet of the inverter cabinet-side cooling flow path.

[0014] In an optional embodiment, the inverter temperature control system includes a cryogenic fluid circuit, which includes a cryogenic fluid pump.

[0015] The cryogenic fluid outlet of the inverter module-side cooling flow path is connected to the first cryogenic fluid inlet of the cryogenic fluid collection device via the cryogenic fluid loop, wherein the cryogenic fluid outlet of the inverter module-side cooling flow path is connected to the cryogenic fluid inlet of the cryogenic fluid loop, and the cryogenic fluid outlet of the cryogenic fluid loop is connected to the first cryogenic fluid inlet of the cryogenic fluid collection device; and / or,

[0016] The cryogenic fluid inlet of the cryogenic fluid circuit is connected to the cryogenic fluid outlet of the cryogenic fluid flow path on the inverter cabinet side.

[0017] In one optional implementation, the inverter temperature control system includes a cryogenic fluid discharge path.

[0018] The second cryogenic fluid outlet of the cryogenic fluid collection device is connected to the cryogenic fluid discharge path; and / or

[0019] The low-temperature fluid outlet of the cooling flow path on the inverter cabinet side is connected to the low-temperature fluid discharge flow path.

[0020] In an optional embodiment, the frequency converter temperature control system includes a cryogenic fluid bypass, wherein the cryogenic fluid inlet of the cryogenic fluid bypass is connected to the cryogenic fluid outlet of the cryogenic fluid supply path, and the outlet of the cryogenic fluid bypass is connected to the second cryogenic fluid inlet of the cryogenic fluid collection device.

[0021] The inverter temperature control system includes a wet-bulb temperature detection device for detecting the wet-bulb temperature on the inverter cabinet side; the control device is configured to control the flow rate of the cryogenic fluid in the cryogenic fluid bypass based on the wet-bulb temperature detected by the wet-bulb temperature detection device.

[0022] In an optional embodiment, the cryogenic fluid bypass includes a third variable frequency pump, and the control device is configured to control the cryogenic fluid flow rate of the cryogenic fluid bypass by controlling the frequency of the third variable frequency pump based on the wet-bulb temperature detected by the wet-bulb temperature detection device.

[0023] In one optional implementation,

[0024] The inverter module-side cooling path includes an inverter module-side cooling plate, and the inverter module-side cooling plate includes a low-temperature fluid passage; and / or,

[0025] The inverter cabinet-side cooling flow path includes an inverter cabinet-side cooling plate, and the inverter cabinet-side cooling plate includes a low-temperature fluid passage.

[0026] According to a second aspect of the present disclosure, an air conditioning unit is provided, characterized in that the air conditioning unit includes an inverter temperature control system as described in any of the first aspects.

[0027] According to a third aspect of the present disclosure, a temperature control method is provided, the temperature control method being applied to a frequency converter temperature control system as described in any of the first aspects, the temperature control method comprising:

[0028] Obtain the ambient temperature of the environment where the frequency converter is located;

[0029] Based on the ambient temperature, the flow rate of the cryogenic fluid in the flow path is controlled to control the temperature of the inverter module side and the inverter cabinet side of the inverter.

[0030] In an optional implementation, controlling the cryogenic fluid flow rate in the cryogenic fluid supply path based on the temperature of the environment where the frequency converter is located includes:

[0031] Obtain the temperature of the cryogenic fluid providing the flow path;

[0032] Based on the temperature of the cryogenic fluid and the ambient temperature, the flow rate of the cryogenic fluid supplying the flow path is controlled.

[0033] In an optional implementation, controlling the cryogenic fluid flow rate in the cryogenic fluid supply path based on the cryogenic fluid temperature and the ambient temperature includes:

[0034] Based on the ambient temperature, the flow rate of the cryogenic fluid in the first flow path is controlled by controlling the frequency of the first variable frequency pump; and / or,

[0035] Based on the temperature of the cryogenic fluid, the flow rate of the cryogenic fluid in the second flow path is controlled by controlling the frequency of the second variable frequency pump.

[0036] In an optional implementation, the inverter temperature control system includes a cryogenic fluid bypass, and the temperature control method includes:

[0037] Obtain the wet-bulb temperature on the inverter cabinet side;

[0038] The cryogenic fluid flow rate of the cryogenic fluid bypass is controlled based on the wet-bulb temperature.

[0039] In an optional implementation, controlling the cryogenic fluid flow rate of the cryogenic fluid bypass based on the wet-bulb temperature includes:

[0040] Based on the wet-bulb temperature, the flow rate of the cryogenic fluid in the cryogenic fluid bypass is controlled by controlling the frequency of the third variable frequency pump.

[0041] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: In this disclosure, the cryogenic fluid supply path, the inverter module-side cooling path, and the inverter cabinet-side cooling path are connected in series. Based on the ambient temperature of the environment where the inverter is located, detected by an ambient temperature detection device, the cryogenic fluid flow rate of the cryogenic fluid supply path is controlled, thereby achieving precise linkage control of the temperature on the inverter module side and the inverter cabinet side. This allows for flexible control of the inverter's thermal environment based on the real-time cooling load within the inverter, effectively avoiding inverter overheating and condensation phenomena, and keeping the internal ambient temperature of the inverter within the optimal operating temperature range, thus improving inverter efficiency. Furthermore, the temperature change on the inverter cabinet side largely depends on the influence of the inverter module side. Setting the inverter module-side cooling path upstream of the inverter cabinet-side cooling path can better improve the temperature control effect of the inverter and better avoid overheating and condensation phenomena.

[0042] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0043] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0046] Figure 1 This is a schematic diagram of the structure of a frequency converter temperature control system according to an exemplary embodiment.

[0047] Figure 2 This is a schematic diagram of the control logic of a frequency converter temperature control system according to an exemplary embodiment. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] The following disclosure provides numerous different embodiments or examples for implementing various aspects of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0050] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0051] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0052] Hereinafter, the embodiments of the present application will be described with reference to the accompanying drawings and preferred examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present specification. The present application can also be implemented or applied through other different specific embodiments, and various modifications and changes can be made to the details in the present specification based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the protection scope of the present application.

[0053] To solve the technical problem that the temperature control for frequency converters in the prior art has a constant cooling capacity, cannot perform accurate coordinated control on the frequency converter module side and the frequency converter cabinet side, and still has unreasonable temperature control, the present disclosure provides a frequency converter temperature control system, an air conditioning unit and a temperature control method. The low-temperature fluid supply flow path, the frequency converter module side cooling flow path and the frequency converter cabinet side cooling flow path are connected in series, and the flow rate of the low-temperature fluid in the low-temperature fluid supply flow path is controlled based on the ambient temperature of the environment where the frequency converter is located detected by the ambient temperature detection device, so as to realize accurate coordinated control of the temperatures on the frequency converter module side and the frequency converter cabinet side, flexibly control the thermal environment of the frequency converter according to the real-time cooling load in the frequency converter, effectively avoid over-temperature and condensation phenomena of the frequency converter, control the internal ambient temperature of the frequency converter within the optimal working temperature range, and improve the working efficiency of the frequency converter. In addition, the temperature change on the frequency converter cabinet side largely depends on the influence of the frequency converter module side. Arranging the frequency converter module side cooling flow path on the upstream side of the frequency converter cabinet side cooling flow path can better improve the temperature control effect on the frequency converter, and better avoid over-temperature and condensation phenomena.

[0054] In an exemplary embodiment, a frequency converter temperature control system and a temperature control method are provided. Reference Figure 1 and Figure 2 as shown in the figure, the frequency converter temperature control system may include a frequency converter module side cooling flow path 1 and a frequency converter cabinet side cooling flow path 2.

[0055] The frequency converter module side cooling flow path 1 is used for cooling the frequency converter module side, so as to realize temperature control on the frequency converter module side. The frequency converter module side cooling flow path 1 may include a frequency converter module side cooling plate 11, and the frequency converter module side cooling plate 11 includes a low-temperature fluid passage, in which low-temperature fluid flows, so as to cool down the frequency converter module side. The frequency converter module side cooling plate 11 may be arranged in close contact with the frequency converter module side to achieve a better cooling effect.

[0056] The inverter cabinet-side cooling path 2 is used to cool the inverter cabinet side, thereby achieving temperature control of the inverter cabinet side. The inverter cabinet-side cooling path 2 may include an inverter cabinet-side cooling plate 21, which may include a low-temperature fluid passage. The low-temperature fluid flows through the low-temperature fluid passage, thereby achieving cooling of the inverter cabinet side. The inverter cabinet-side cooling plate 21 can be installed in close contact with the inverter cabinet side for better cooling effect.

[0057] The inverter temperature control system may include a cryogenic fluid supply path 3, which provides cryogenic fluid to the inverter temperature control system. The cryogenic fluid may be cooling water or other cryogenic fluids, and there is no limitation thereto.

[0058] In this configuration, the cryogenic fluid inlet of the inverter module-side cooling flow path 1 is connected to the cryogenic fluid outlet of the cryogenic fluid supply flow path 3, and the cryogenic fluid outlet of the inverter module-side cooling flow path 1 is connected to the cryogenic fluid inlet of the inverter cabinet-side cooling flow path 2. In other words, the inverter module-side cooling flow path 1 is located upstream of the inverter cabinet-side cooling flow path 2. It should be noted that the temperature change on the inverter cabinet side largely depends on the influence of the inverter module side. Positioning the inverter module-side cooling flow path 1 upstream of the inverter cabinet-side cooling flow path 2 can better improve the temperature control effect of the inverter and better avoid overheating and condensation phenomena.

[0059] The inverter temperature control system may further include an ambient temperature detection device 311 and a control device 8 (MCU). The ambient temperature detection device 311 is used to detect the ambient temperature of the environment where the inverter is located. The control device 8 is configured to control the flow rate of the cryogenic fluid supplied to the flow path 3 based on the ambient temperature detected by the ambient temperature detection device 311, so as to control the temperature of the inverter module side and the inverter cabinet side of the inverter.

[0060] In this inverter temperature control system, the ambient temperature detection device 311 can detect the ambient temperature of the environment where the inverter is located, and the control device 8 can obtain the ambient temperature of the environment where the inverter is located from the ambient temperature detection device 311. Then, based on the above-mentioned ambient temperature, the control device 8 can control the flow rate of the cryogenic fluid in the cryogenic fluid supply path 3 to control the temperature of the inverter module side and the inverter cabinet side.

[0061] For example, when the air conditioning unit is running, the ambient temperature of the environment where the inverter is located will change accordingly. When the compressor load of the air conditioning unit increases, the ambient temperature of the environment where the inverter is located rises, and the cooling load increases. The control device 8 can then provide feedback on the cryogenic fluid flow rate of the cryogenic fluid supply path 3 based on the ambient temperature detected by the ambient temperature detection device 311. In this case, the cryogenic fluid flow rate can be increased to provide more cryogenic fluid to the inverter module side to meet the cooling load demand at this moment. Conversely, when the ambient temperature decreases and the cooling load decreases, the cryogenic fluid flow rate of the cryogenic fluid supply path 3 can be reduced.

[0062] In this inverter temperature control system and method, the low-temperature fluid supply path 3, the inverter module-side cooling path 1, and the inverter cabinet-side cooling path 2 are connected in series. Based on the ambient temperature of the environment where the inverter is located, detected by the ambient temperature detection device 311, the flow rate of the low-temperature fluid in the low-temperature fluid supply path 3 is controlled. This achieves precise and coordinated temperature control between the inverter module side and the inverter cabinet side, enabling flexible control of the inverter's thermal environment. This effectively avoids inverter overheating and condensation, keeping the internal ambient temperature of the inverter within the optimal operating temperature range and improving inverter efficiency. Furthermore, since the temperature change on the inverter cabinet side largely depends on the inverter module side, placing the inverter module-side cooling path 1 upstream of the inverter cabinet-side cooling path 2 further enhances temperature control and better prevents overheating and condensation.

[0063] In one exemplary embodiment, a frequency converter temperature control system and a temperature control method are provided. (Reference) Figure 1 and Figure 2 As shown, the frequency converter temperature control system may include a low-temperature fluid temperature detection device 321, which is installed in the low-temperature fluid supply path 3 and is used to detect the low-temperature fluid temperature in the low-temperature fluid supply path 3.

[0064] The control device 8 is configured to control the flow rate of the cryogenic fluid in the cryogenic fluid supply path 3 based on the temperature detected by the cryogenic fluid temperature detection device 321 and the temperature detected by the ambient temperature detection device 311, so as to control the temperature of the inverter module side and the inverter cabinet side of the inverter.

[0065] In other words, in this inverter temperature control system and method, after the ambient temperature detection device 311 detects the ambient temperature and the cryogenic fluid temperature detection device 321 detects the cryogenic fluid temperature, the control device 8 can obtain the ambient temperature from the ambient temperature detection device 311 and the cryogenic fluid temperature from the cryogenic fluid temperature detection device 321. Then, based on the cryogenic fluid temperature and the ambient temperature, the flow rate of the cryogenic fluid supply path 3 can be controlled. That is, this method can combine the ambient temperature and the cryogenic fluid temperature to control the flow rate of the cryogenic fluid supply path 3, thereby achieving a more accurate cryogenic fluid supply and thus more precise temperature control.

[0066] The cryogenic fluid supply path 3 may include a first flow path 31, which includes a first variable frequency pump 312. The first variable frequency pump 312 may be a power-controlled variable frequency pump on the inverter module side. The control device 8 may be configured to control the cryogenic fluid flow rate of the first flow path 31 by controlling the frequency of the first variable frequency pump 312 based on the ambient temperature detected by the ambient temperature detection device 311.

[0067] In other words, after the control device 8 obtains the ambient temperature, it can control the frequency of the first variable frequency pump 312 based on the ambient temperature, thereby controlling the flow rate of the cryogenic fluid in the first flow path 31, and thus achieving control over the overall cryogenic fluid flow rate of the cryogenic fluid supply flow path 3. Generally, with other data remaining constant, the higher the ambient temperature, the higher the frequency of the first variable frequency pump 312; the lower the ambient temperature, the lower the frequency of the first variable frequency pump 312. Here, frequency refers to operating frequency.

[0068] The cryogenic fluid supply path 3 may also include a second flow path 32, which includes a second variable frequency pump 322. The second variable frequency pump 322 may be a temperature-controlled variable frequency pump on the inverter module side. The control device 8 may be configured to control the cryogenic fluid flow rate of the second flow path 32 by controlling the frequency of the second variable frequency pump 322 based on the temperature detected by the cryogenic fluid temperature detection device 321.

[0069] In other words, after the control device 8 obtains the temperature of the cryogenic fluid, it can control the frequency of the second variable frequency pump 322 based on the cryogenic fluid temperature, thereby controlling the cryogenic fluid flow rate of the second flow path 32, and thus achieving control over the overall cryogenic fluid flow rate of the cryogenic fluid supply flow path 3. Generally, with other data remaining constant, the higher the cryogenic fluid temperature, the higher the frequency of the second variable frequency pump 322; the lower the cryogenic fluid temperature, the lower the frequency of the second variable frequency pump 322. Here, frequency refers to operating frequency.

[0070] In some implementations...

[0071] refer to Figure 1and Figure 2 As shown, the cryogenic fluid can be cooling water. The ambient temperature detection device 311 can be an ambient temperature sensor. The cryogenic fluid temperature detection device 321 can be a water supply temperature sensor. In this inverter temperature control system, during stable operation, the frequency of the first inverter pump 312 can be between 30% and 40% (the specific value can be set according to the system's environment and the optimal operating temperature range of the module), maintaining the temperature of the inverter module within a certain range.

[0072] When the unit is under load, the ambient temperature inside the frequency converter will rise or fall accordingly. For example, when the unit's compressor load increases, the ambient temperature of the environment where the frequency converter is located rises, and the cooling load increases. When the temperature rise is within the range of T0 (e.g., T0 is 30℃~35℃, T0 is set according to the actual operating conditions of the unit), the ambient temperature sensor will provide feedback to the first frequency converter pump 312 based on this temperature rise. The control device 8 can control the frequency of the first frequency converter pump 312 to increase to 40%~50% to increase the water supply of the first flow path 31, providing more chilled water to the frequency converter module to meet the cooling load on the module side at this time. When the temperature rise is within the range of T1 (T1 can be set according to actual needs, the minimum temperature in T1 is greater than the maximum temperature in T0), the frequency of the first frequency converter pump 312 is increased to 50%~60%, and so on.

[0073] It should be noted that if more precise control is required, the frequency range of the variable frequency pump corresponding to the temperature rise range can be narrowed. At the same time, the frequency opening of the variable frequency pump corresponding to the temperature range can also be adjusted according to the actual situation.

[0074] Conversely, when the cooling demand decreases (i.e., when the cooling load decreases), the ambient temperature sensor provides feedback to the first variable frequency pump 312, and the control device 8 can reduce the frequency of the first variable frequency pump 312 to reduce the water flow rate of the first flow path 31.

[0075] In addition, in this embodiment, the second variable frequency pump 322 in the second flow path 32 can be controlled by a water supply temperature sensor to achieve regulation based on the cold water temperature provided by the water supply side. Specifically, when the cold water temperature provided by the water supply side is low, a relatively small water flow rate can meet the cooling needs of the module side. For example, when the ambient temperature of the inverter is within the aforementioned T0 range, if the water temperature on the water supply side is Ta (relatively low to T0, such as 20°C), the frequency of the second variable frequency pump 322 can be controlled to decrease by 10% compared to the previous value; conversely, if the water temperature provided by the water supply side is Tb (relative to Ta, Tb is closer to T0, such as 25°C), it indicates that the water flow rate needs to be increased, and the frequency of the second variable frequency pump 322 can be controlled to increase by 20% to 25% to meet the cooling needs. It should be noted that due to differences in specific engineering water quality and ambient temperature, the frequency of the second variable frequency pump 322 corresponding to the water temperature can be set according to the actual operating conditions. The inverter module side uses the above two methods to control the internal thermal environment of the inverter in real time.

[0076] It should be noted that, in addition to the methods described above, precise temperature control can also be achieved through other means, and no limitation is made on these methods.

[0077] In this embodiment, the entire cryogenic fluid supply path 3 is jointly controlled by the ambient temperature detection device 311 and the cryogenic fluid temperature detection device 321. The cryogenic fluid temperature detection device 321 is included because the cryogenic fluid temperature in the cryogenic fluid supply path 3 has a significant and independent impact on the cooling effect. Furthermore, it should be noted that sudden load changes may occur during the operation of the air conditioning unit. This embodiment can be used to increase the cryogenic fluid flow rate in real time to address sudden load increases. Of course, this embodiment can also be used to control the cryogenic fluid flow rate in other situations to achieve more precise temperature control.

[0078] The amount of refrigerant (e.g., R22 / R134a) charged into each unit is fixed at the factory, making it inconvenient to add extra refrigerant. Furthermore, using a low-temperature fluid such as chilled water better demonstrates the advantages of the control flow path where the temperature detection device 321 is located compared to other refrigerants. This is because chilled water is generally supplied by an external water pipe to the unit, resulting in varying inlet water temperatures. With other refrigerants, we typically use the refrigerant already in the refrigeration system (e.g., R22 / R134a). However, due to constraints such as unit operating load and conditions, the temperature difference when the refrigerant circulates to the inverter is not significant, and the required cooling flow rate also does not vary considerably. Therefore, using a low-temperature fluid like chilled water better showcases the control advantages of the flow path where the temperature detection device 321 is located. It should be noted that the low-temperature fluid can be not limited to chilled water but can also be other low-temperature fluids such as ethylene glycol.

[0079] In this inverter temperature control system and method, the flow rate of the low-temperature fluid in the low-temperature fluid supply path 3 is controlled by the combined use of the ambient temperature detection device 311 and the low-temperature fluid temperature detection device 321. This achieves precise cooling on the inverter module side and enables precise linkage control of the temperature on both the inverter module side and the inverter cabinet side. It also allows for flexible control of the inverter's thermal environment based on the real-time cooling load inside the inverter, effectively avoiding overheating and condensation phenomena, and keeping the internal ambient temperature of the inverter within the optimal operating temperature range, thereby improving the inverter's operating efficiency.

[0080] In one exemplary embodiment, a frequency converter temperature control system and a temperature control method are provided. (Reference) Figure 1 and Figure 2 As shown, the frequency converter temperature control system may include a cryogenic fluid collection device 6. For example, when the cryogenic fluid is cooling water, the cryogenic fluid collection device 6 may be a water collection tank.

[0081] In this configuration, the cryogenic fluid outlet of the inverter module-side cooling flow path 1 is connected to the cryogenic fluid inlet of the inverter cabinet-side cooling flow path 2 via a cryogenic fluid collection device 6. For example, the cryogenic fluid outlet of the inverter module-side cooling flow path 1 is connected to the first cryogenic fluid inlet of the cryogenic fluid collection device 6, and the first cryogenic fluid outlet of the cryogenic fluid collection device 6 is connected to the cryogenic fluid inlet of the inverter cabinet-side cooling flow path. In other words, the cryogenic fluid discharged from the inverter module-side cooling flow path 1 can first enter the cryogenic fluid collection device 6 for collection, and then flow into the inverter cabinet-side cooling flow path 2 to cool the inverter cabinet side.

[0082] The inverter temperature control system may include a cryogenic fluid circuit 4, which includes a cryogenic fluid pump 41. For example, when the cryogenic fluid is cooling water, the cryogenic fluid pump 41 may be a return water pump. The cryogenic fluid outlet of the inverter module-side cooling flow path 1 is connected to the first cryogenic fluid inlet of the cryogenic fluid collection device 6 via the cryogenic fluid circuit 4. For example, the cryogenic fluid outlet of the inverter module-side cooling flow path 1 is connected to the cryogenic fluid inlet of the cryogenic fluid circuit 4, and the cryogenic fluid outlet of the cryogenic fluid circuit 4 is connected to the first cryogenic fluid inlet of the cryogenic fluid collection device 6. That is, the cryogenic fluid that has participated in the cooling of the inverter module side can flow into the cryogenic fluid collection device 6 through the cryogenic fluid circuit 4. Because a cryogenic fluid pump 41 is provided in the cryogenic fluid circuit 4, the flow of cryogenic fluid in the cryogenic fluid circuit 4 can be better controlled by controlling the cryogenic fluid pump 41.

[0083] In addition, the cryogenic fluid inlet of cryogenic fluid circuit 4 can be connected to the cryogenic fluid outlet of the cryogenic fluid flow path on the inverter cabinet side. That is to say, the cryogenic fluid that has participated in the cooling of the inverter cabinet side can flow back into the cryogenic fluid collection device 6 through cryogenic fluid circuit 4 to facilitate the recycling and reuse of cryogenic fluid.

[0084] The inverter temperature control system may include a cryogenic fluid discharge path 7, which is used to discharge the cryogenic fluid that has participated in the cooling or the excess cryogenic fluid from the inverter temperature control system, so as to better replenish the inverter temperature control system with new cryogenic fluid.

[0085] For example, the second cryogenic fluid outlet of the cryogenic fluid collection device 6 can be connected to the cryogenic fluid discharge path 7. When there is too much cryogenic fluid in the cryogenic fluid collection device 6, the flow path between the second cryogenic fluid outlet and the cryogenic fluid discharge path 7 can be controlled to discharge the excess cryogenic fluid.

[0086] For example, the cryogenic fluid outlet of the inverter cabinet-side cooling flow path 2 can be connected to the cryogenic fluid discharge flow path 7. The cryogenic fluid that has been fully involved in the cooling of the inverter module side and the inverter cabinet side can directly flow into the cryogenic fluid discharge flow path 7 through the cryogenic fluid outlet of the inverter cabinet-side cooling flow path 2, and then be discharged through the cryogenic fluid discharge flow path 7.

[0087] It should be noted that, in addition to the above-described method, the cryogenic fluid discharge path 7 can also be configured in other ways, and there is no limitation on this. Of course, the cryogenic fluid discharge path 7 can also be connected to both the second cryogenic fluid outlet of the cryogenic fluid collection device 6 and the cryogenic fluid outlet of the inverter cabinet-side cooling path 2, and there is no limitation on this.

[0088] In addition, the inverter temperature control system may include a cryogenic fluid bypass 5. The cryogenic fluid inlet of the cryogenic fluid bypass 5 is connected to the cryogenic fluid outlet of the cryogenic fluid supply path 3, and the outlet of the cryogenic fluid bypass 5 is connected to the second cryogenic fluid inlet of the cryogenic fluid collection device 6. That is to say, the original cryogenic fluid in the cryogenic fluid supply path 3 can directly enter the cryogenic fluid collection device 6 through the cryogenic fluid bypass 5, and then participate in the cooling of the inverter cabinet side, thereby improving the cooling effect on the inverter cabinet side when necessary.

[0089] The inverter temperature control system may include a wet-bulb temperature detection device 51 for detecting the wet-bulb temperature on the inverter cabinet side. The wet-bulb temperature detection device 51 may be a wet-bulb temperature sensor. The control device 8 may be configured to control the cryogenic fluid flow rate of the cryogenic fluid bypass 5 based on the wet-bulb temperature detected by the wet-bulb temperature detection device 51.

[0090] In this inverter temperature control system, the wet-bulb temperature detection device 51 can detect the wet-bulb temperature on the inverter cabinet side. The control device 8 can obtain the wet-bulb temperature on the inverter cabinet side from the wet-bulb temperature detection device 51, and then control the cryogenic fluid flow rate of the cryogenic fluid bypass 5 based on the wet-bulb temperature.

[0091] The cryogenic fluid bypass 5 may include a third variable frequency pump 52, and the control device 8 may be configured to control the cryogenic fluid flow rate of the cryogenic fluid bypass 5 by controlling the frequency of the third variable frequency pump 52 based on the wet-bulb temperature detected by the wet-bulb temperature detection device 51.

[0092] In other words, after the control device 8 obtains the wet-bulb temperature, it can control the frequency of the third variable frequency pump 52 based on the wet-bulb temperature, thereby controlling the flow rate of the cryogenic fluid in the cryogenic fluid bypass 5, and thus controlling the flow rate of the cryogenic fluid in the cryogenic fluid bypass 5.

[0093] In some implementations...

[0094] refer to Figure 1 and Figure 2 As shown, the cryogenic fluid can be cooling water. The ambient temperature detection device 311 can be an ambient temperature sensor. The cryogenic fluid temperature detection device 321 can be a water supply temperature sensor. In this inverter temperature control system, during stable operation, the frequency of the first inverter pump 312 can be between 30% and 40% (the specific value can be set according to the system's environment and the optimal operating temperature range of the module), maintaining the temperature of the inverter module within a certain range.

[0095] When the unit is under load, the ambient temperature inside the frequency converter will rise or fall accordingly. For example, when the unit's compressor load increases, the ambient temperature of the environment where the frequency converter is located rises, and the cooling load increases. When the temperature rise is within the range of T0 (e.g., T0 is 30℃~35℃, T0 is set according to the actual operating conditions of the unit), the ambient temperature sensor will provide feedback to the first frequency converter pump 312 based on this temperature rise. The control device 8 can control the frequency of the first frequency converter pump 312 to increase to 40%~50% to increase the water supply of the first flow path 31, providing more chilled water to the frequency converter module to meet the cooling load on the module side at this time. When the temperature rise is within the range of T1 (T1 can be set according to actual needs, the minimum temperature in T1 is greater than the maximum temperature in T0), the frequency of the first frequency converter pump 312 is increased to 50%~60%, and so on.

[0096] It should be noted that if more precise control is required, the frequency range of the variable frequency pump corresponding to the temperature rise range can be narrowed. At the same time, the frequency opening of the variable frequency pump corresponding to the temperature range can also be adjusted according to the actual situation.

[0097] Conversely, when the cooling demand decreases (i.e., when the cooling load decreases), the ambient temperature sensor provides feedback to the first variable frequency pump 312, and the control device 8 can reduce the frequency of the first variable frequency pump 312 to reduce the water flow rate of the first flow path 31.

[0098] In addition, in this embodiment, the second variable frequency pump 322 in the second flow path 32 can be controlled by a water supply temperature sensor to achieve regulation based on the cold water temperature provided by the water supply side. Specifically, when the cold water temperature provided by the water supply side is low, a relatively small water flow rate can meet the cooling needs of the module side. For example, when the ambient temperature of the inverter is within the aforementioned T0 range, if the water temperature on the water supply side is Ta (relatively low to T0, such as 20°C), the frequency of the second variable frequency pump 322 can be controlled to decrease by 10% compared to the previous value; conversely, if the water temperature provided by the water supply side is Tb (relative to Ta, Tb is closer to T0, such as 25°C), it indicates that the water flow rate needs to be increased, and the frequency of the second variable frequency pump 322 can be controlled to increase by 20% to 25% to meet the cooling needs. It should be noted that due to differences in specific engineering water quality and ambient temperature, the frequency of the second variable frequency pump 322 corresponding to the water temperature can be set according to the actual operating conditions. The inverter module side uses the above two methods to control the internal thermal environment of the inverter in real time.

[0099] The inverter cabinet-side cooling flow path 2 can be controlled in case of a sudden drop in unit load. The wet-bulb temperature detection device 51 can be a wet-bulb temperature sensor. The third inverter pump 52 can be a temperature-controlled inverter pump. The preset value of the wet-bulb temperature detection device 51 can be set slightly higher than the dew point temperature of the environment where the inverter is located. For example, when the dew point temperature is 0℃, the preset value can be set to 0.5℃~2.0℃.

[0100] In this embodiment, when the detected wet-bulb temperature on the inverter cabinet side reaches the preset value of the wet-bulb temperature detection device 51, the control device 8 can control the third inverter pump 52 to provide feedback, increasing its frequency by 30% to 40% compared to the initial frequency. If the wet-bulb temperature is lower than the preset value, the frequency of the third inverter pump 52 can be continuously increased until full frequency, drawing a portion of the cryogenic fluid from the cryogenic fluid supply path 3. This portion of cryogenic fluid is drawn into the cryogenic fluid collection device 6 and mixed with the return water from the inverter module side cooling path 1. On the one hand, this reduces the cooling capacity on the inverter module side, preventing over-cooling; on the other hand, since the cooling load on the inverter cabinet side is relatively lower than that on the inverter module side, its required cooling water supply temperature is lower. Therefore, the mixture of this drawn cold water with the return water from the cryogenic fluid flow path on the inverter module side can recover the waste heat of the return water from the inverter module side cooling path 1, and can also effectively control the internal thermal environment on the inverter cabinet side.

[0101] It should be noted that in this embodiment, the cooling water in the low-temperature fluid bypass 5 first enters the low-temperature fluid collection device 6, and then mixes with the return water of the low-temperature fluid flow path on the inverter module side. Since the required cooling capacity on the inverter cabinet side is lower than that on the inverter module side, and after the cold water is extracted from the upstream side of the cooling flow path 1 on the inverter module side, the cold water mixes with the water in the low-temperature fluid collection device 6, which will raise the temperature of the cold water extracted from the upstream side, and then supply it to the inverter cabinet side for cooling, so as to realize the recovery of the waste heat of the return water of the low-temperature fluid flow path on the inverter module side.

[0102] First, condensation on the inverter cabinet side tends to occur on metal surfaces, and this phenomenon can occur on both the inverter module side and the inverter cabinet side. Second, temperature changes on the inverter cabinet side largely depend on the influence of the inverter module side. Therefore, temperature changes on the inverter cabinet side lag behind temperature changes on the inverter module side (this is one of the reasons why the preset value is set higher than the dew point temperature), which means that condensation may first appear on the inverter module side.

[0103] For the reasons mentioned above, when the unit load suddenly drops, the worst operating conditions will first occur on the inverter module side. Therefore, it is necessary to increase the frequency of the third inverter pump 52 to draw cold water from the upstream side of the inverter module cooling flow path 1 to weaken the cooling effect on the inverter module side. Simultaneously, due to the installation of the cryogenic fluid collection device 6, the drawn cold water will first mix with the return water on the inverter module side, which can also play a certain buffering role before being supplied to the inverter cabinet side. At this time, the ambient temperature on the inverter cabinet side decreases, and the ambient temperature detection device 311 will respond to this signal, thereby reducing the frequency of the first inverter pump 312 and decreasing the cold water supply. Furthermore, the control by the ambient temperature detection device 311 itself has a certain lag. Therefore, the design of this cryogenic fluid bypass 5 can feed back the cooling signal to the ambient temperature detection device 311 in advance, which can better avoid the aforementioned lag and effectively solve the problem of condensation caused by over-cooling.

[0104] This implementation method uses the ambient temperature detection device 311 and the low-temperature fluid temperature detection device 321 to jointly control the flow rate of the low-temperature fluid in the low-temperature fluid supply path 3, which can achieve precise cooling on the inverter module side. Utilizing the wet-bulb temperature detection device 51 and the third inverter pump 52, it flexibly controls the inverter cabinet side in response to sudden changes in the internal cooling load of the inverter, preventing over-cooling and condensation problems inside the inverter. This inverter temperature control system and method flexibly controls the inverter's thermal environment, simultaneously avoiding inverter overheating and condensation, keeping the internal ambient temperature of the inverter within the optimal operating temperature range, and improving inverter efficiency. At the same time, it utilizes the waste heat from the return water on the inverter module side to reduce cooling energy consumption.

[0105] In one exemplary embodiment, an air conditioning unit is provided. The air conditioning unit may include the inverter temperature control system described above.

[0106] This air conditioning unit uses the aforementioned inverter temperature control system, referencing... Figure 1 and Figure 2 As shown, the cryogenic fluid supply path 3, the inverter module-side cooling path 1, and the inverter cabinet-side cooling path 2 are connected in series. Based on the ambient temperature of the environment where the inverter is located, detected by the ambient temperature detection device 311, the flow rate of the cryogenic fluid in the cryogenic fluid supply path 3 is controlled. This achieves precise linkage control of the temperature on both the inverter module side and the inverter cabinet side. It allows for flexible control of the inverter's thermal environment based on the real-time cooling load within the inverter, effectively avoiding overheating and condensation phenomena, and keeping the internal ambient temperature of the inverter within the optimal operating temperature range, thus improving inverter efficiency. Furthermore, the temperature change on the inverter cabinet side largely depends on the influence of the inverter module side. Placing the inverter module-side cooling path 1 upstream of the inverter cabinet-side cooling path 2 further enhances the temperature control effect of the inverter, better preventing overheating and condensation phenomena.

[0107] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0108] It should be noted that the terms "one implementation," "embodiment," "exemplary embodiment," and "some embodiments" used in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0109] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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. Unless otherwise specified, 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.

[0110] The above embodiments are merely preferred embodiments provided to fully illustrate this application, and the scope of protection of this application is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on this application are all within the scope of protection of this application.

Claims

1. A frequency converter temperature control system, characterized in that, The inverter temperature control system includes a low-temperature fluid supply path, an inverter module-side cooling path, and an inverter cabinet-side cooling path. The low-temperature fluid inlet of the inverter module-side cooling path is connected to the low-temperature fluid outlet of the low-temperature fluid supply path. The inverter module-side cooling path is used to cool the inverter module side. The low-temperature fluid outlet of the inverter module-side cooling path is connected to the low-temperature fluid inlet of the inverter cabinet-side cooling path. The inverter cabinet-side cooling path is used to cool the inverter cabinet side. The inverter temperature control system also includes an ambient temperature detection device and a control device. The ambient temperature detection device is used to detect the ambient temperature of the environment where the inverter is located. The control device is configured to control the flow rate of the cryogenic fluid in the flow path based on the ambient temperature detected by the ambient temperature detection device, so as to perform temperature control on the inverter module side and the inverter cabinet side of the inverter. The inverter temperature control system includes a low-temperature fluid collection device. The low-temperature fluid outlet of the inverter module-side cooling flow path is connected to the low-temperature fluid inlet of the inverter cabinet-side cooling flow path through the low-temperature fluid collection device. The low-temperature fluid outlet of the inverter module-side cooling flow path is connected to the first low-temperature fluid inlet of the low-temperature fluid collection device, and the first low-temperature fluid outlet of the low-temperature fluid collection device is connected to the low-temperature fluid inlet of the inverter cabinet-side cooling flow path. The frequency converter temperature control system includes a cryogenic fluid bypass, the cryogenic fluid inlet of the cryogenic fluid bypass is connected to the cryogenic fluid outlet of the cryogenic fluid supply path, and the outlet of the cryogenic fluid bypass is connected to the second cryogenic fluid inlet of the cryogenic fluid collection device. The inverter temperature control system includes a wet-bulb temperature detection device for detecting the wet-bulb temperature on the inverter cabinet side; the control device is configured to control the flow rate of the cryogenic fluid in the cryogenic fluid bypass based on the wet-bulb temperature detected by the wet-bulb temperature detection device.

2. The inverter temperature control system according to claim 1, characterized in that, The frequency converter temperature control system includes a low-temperature fluid temperature detection device, which is installed in the low-temperature fluid supply path and is used to detect the low-temperature fluid temperature in the low-temperature fluid supply path. The control device is configured to control the flow rate of the cryogenic fluid in the flow path based on the cryogenic fluid temperature detected by the cryogenic fluid temperature detection device and the ambient temperature detected by the ambient temperature detection device, so as to perform temperature control on the inverter module side and the inverter cabinet side of the inverter.

3. The frequency converter temperature control system according to claim 2, characterized in that, The cryogenic fluid supply path includes a first flow path, the first flow path including a first variable frequency pump; the control device is configured to control the cryogenic fluid flow rate of the first flow path by controlling the frequency of the first variable frequency pump based on the ambient temperature detected by the ambient temperature detection device. And / or, The cryogenic fluid supply path includes a second flow path, and the second flow path includes a second variable frequency pump; the control device is configured to control the cryogenic fluid flow rate of the second flow path by controlling the frequency of the second variable frequency pump based on the cryogenic fluid temperature detected by the cryogenic fluid temperature detection device.

4. The inverter temperature control system according to claim 1, characterized in that, The inverter temperature control system includes a cryogenic fluid circuit, which includes a cryogenic fluid pump. The cryogenic fluid outlet of the inverter module-side cooling flow path is connected to the first cryogenic fluid inlet of the cryogenic fluid collection device via the cryogenic fluid loop, wherein the cryogenic fluid outlet of the inverter module-side cooling flow path is connected to the cryogenic fluid inlet of the cryogenic fluid loop, and the cryogenic fluid outlet of the cryogenic fluid loop is connected to the first cryogenic fluid inlet of the cryogenic fluid collection device; and / or, The cryogenic fluid inlet of the cryogenic fluid circuit is connected to the cryogenic fluid outlet of the cryogenic fluid flow path on the inverter cabinet side.

5. The inverter temperature control system according to claim 1, characterized in that, The inverter temperature control system includes a low-temperature fluid discharge path. The second cryogenic fluid outlet of the cryogenic fluid collection device is connected to the cryogenic fluid discharge path; and / or The low-temperature fluid outlet of the cooling flow path on the inverter cabinet side is connected to the low-temperature fluid discharge flow path.

6. The inverter temperature control system according to claim 1, characterized in that, The cryogenic fluid bypass includes a third variable frequency pump, and the control device is configured to control the cryogenic fluid flow rate of the cryogenic fluid bypass by controlling the frequency of the third variable frequency pump based on the wet-bulb temperature detected by the wet-bulb temperature detection device.

7. The frequency converter temperature control system according to any one of claims 1-6, characterized in that, The inverter module-side cooling path includes an inverter module-side cooling plate, and the inverter module-side cooling plate includes a low-temperature fluid passage; and / or, The inverter cabinet-side cooling flow path includes an inverter cabinet-side cooling plate, and the inverter cabinet-side cooling plate includes a low-temperature fluid passage.

8. An air conditioning unit, characterized in that, The air conditioning unit includes the inverter temperature control system as described in any one of claims 1-7.

9. A temperature control method, characterized in that, The temperature control method is applied to the inverter temperature control system as described in any one of claims 1-7, and the temperature control method includes: Obtain the ambient temperature of the environment where the frequency converter is located; Based on the ambient temperature, the flow rate of the cryogenic fluid in the flow path is controlled to control the temperature of the inverter module side and the inverter cabinet side of the inverter. The inverter temperature control system includes a low-temperature fluid bypass, and the temperature control method includes: Obtain the wet-bulb temperature on the inverter cabinet side; The cryogenic fluid flow rate of the cryogenic fluid bypass is controlled based on the wet-bulb temperature.

10. The temperature control method according to claim 9, characterized in that, The control of the cryogenic fluid flow rate in the flow path based on the ambient temperature of the inverter includes: Obtain the temperature of the cryogenic fluid providing the flow path; Based on the temperature of the cryogenic fluid and the ambient temperature, the flow rate of the cryogenic fluid supplying the flow path is controlled.

11. The temperature control method according to claim 10, characterized in that, The control of the cryogenic fluid flow rate in the flow path based on the cryogenic fluid temperature and the ambient temperature includes: Based on the ambient temperature, the flow rate of the cryogenic fluid in the first flow path is controlled by controlling the frequency of the first variable frequency pump; and / or, Based on the temperature of the cryogenic fluid, the flow rate of the cryogenic fluid in the second flow path is controlled by controlling the frequency of the second variable frequency pump.

12. The temperature control method according to claim 9, characterized in that, The control of the cryogenic fluid flow rate in the cryogenic fluid bypass based on the wet-bulb temperature includes: Based on the wet-bulb temperature, the flow rate of the cryogenic fluid in the cryogenic fluid bypass is controlled by controlling the frequency of the third variable frequency pump.

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