Intelligent air-cooled circulation heat dissipation system for SVG power cabinet

Abstract

The utility model relates to SVG heat radiation technical field, disclose a kind of SVG power cabinet intelligent air cooling circulation heat dissipation system, the SVG power cabinet intelligent air cooling circulation heat dissipation system includes temperature and humidity sensor, controller, ventilation equipment, air duct switching device and air duct tee bend valve, controller is connected temperature and humidity sensor, ventilation equipment and air duct switching device respectively, air duct switching device connects air duct tee bend valve, ventilation equipment and air duct tee bend valve one-to-one correspondence, wherein, temperature and humidity sensor is used to detect the temperature and humidity data of SVG power cabinet intelligent air cooling circulation heat dissipation system, controller is used to receive temperature and humidity data, and control the start-stop and rotational speed of ventilation equipment, control air duct switching device switches the opening and closing of air duct tee bend valve. The utility model can improve heat dissipation efficiency, reduce equipment energy consumption, reduce equipment failure frequency, improve equipment stability.

Description

Technical Field

[0001] This utility model relates to the field of SVG heat dissipation technology, specifically to an intelligent air-cooled circulating heat dissipation system for SVG power cabinets. Background Technology

[0002] With the rapid development of power electronics technology, SVG (Static Var Generator) devices are being used more and more widely in power systems. SVG power components generate a large amount of heat during operation. If this heat is not dissipated effectively and promptly, the temperature inside the cabinet will rise rapidly, severely affecting the normal operation of the equipment. Therefore, the quality of the SVG power cabinet's heat dissipation system is extremely important. Currently, the heat dissipation systems for SVG equipment are mainly divided into two categories: water cooling systems and air cooling systems. However, these systems are prone to causing equipment failure and have low stability.

[0003] With the continuous development of new energy sources and the increasing demands of the power grid for power quality, the requirements for the stability and reliability of SVG reactive power compensation equipment are also increasing. Due to the instability of the SVG equipment's heat dissipation system, enterprises incur high maintenance costs and increase the assessment of power consumption. Utility Model Content

[0004] In view of this, the present invention provides an intelligent air-cooled circulating heat dissipation system for SVG power cabinets, which can improve heat dissipation efficiency, reduce equipment energy consumption, reduce equipment failure frequency, and improve equipment stability.

[0005] In a first aspect, this utility model provides an intelligent air-cooled circulating heat dissipation system for SVG power cabinets. The intelligent air-cooled circulating heat dissipation system for SVG power cabinets includes a temperature and humidity sensor, a controller, ventilation equipment, an air duct switching device, and an air duct three-way valve. The controller is connected to the temperature and humidity sensor, the ventilation equipment, and the air duct switching device. The air duct switching device is connected to the air duct three-way valve. The ventilation equipment and the air duct three-way valve are in one-to-one correspondence. The temperature and humidity sensor is used to detect the temperature and humidity data of the intelligent air-cooled circulating heat dissipation system for SVG power cabinets. The controller is used to receive the temperature and humidity data and control the start, stop, and speed of the ventilation equipment, and control the air duct switching device to switch the opening and closing of the air duct three-way valve.

[0006] In this implementation method, by adding a three-way valve and controller to the air duct, fully automated intelligent closed-loop control of the ventilation equipment and the three-way valve in the air duct is achieved, realizing the three effects of heat dissipation, anti-condensation and energy saving, reducing the energy consumption of equipment operation and improving economic efficiency.

[0007] In one optional embodiment, the SVG power cabinet is installed in the SVG equipment room, and the temperature and humidity sensors include an air inlet temperature sensor, an air inlet humidity sensor, an SVG indoor temperature sensor, and an SVG cabinet temperature sensor. The air inlet temperature sensor and the air inlet humidity sensor are installed at the air inlet of the SVG equipment room, the SVG indoor temperature sensor is installed in the SVG equipment room, and the SVG cabinet temperature sensor is installed inside the SVG power cabinet.

[0008] In one optional implementation, the system further includes a frequency converter, and the controller is connected to the ventilation equipment through the frequency converter. The controller includes a temperature and humidity module, a digital output module, and a communication module. The controller collects temperature and humidity data from the temperature and humidity sensor through the temperature and humidity module, controls the air duct switching device through the digital output module, and controls the output frequency of the frequency converter through the communication module to control the ventilation equipment.

[0009] In one alternative implementation, the ventilation device is a plurality of cooling fans.

[0010] In one optional implementation, the duct switching device consists of multiple contactors, each contactor controlling a duct three-way valve group, each duct three-way valve group including at least one duct three-way valve, wherein the controller controls the opening or closing of the corresponding duct three-way valve group by controlling the energization and de-energization of the contactor coil.

[0011] In one optional embodiment, the contactor includes a first contactor, a second contactor, a third contactor, and a fourth contactor, and the duct three-way valve includes a first duct three-way valve, a second duct three-way valve, a third duct three-way valve, a fourth duct three-way valve, a fifth duct three-way valve, and a sixth duct three-way valve. The first, second, and third duct three-way valves form a first duct three-way valve group, and the fourth, fifth, and sixth duct three-way valves form a second duct three-way valve group. The first contactor is used to control the opening of the first duct three-way valve group, the second contactor is used to control the closing of the first duct three-way valve group, the third contactor is used to control the opening of the second duct three-way valve group, and the fourth contactor is used to control the closing of the second duct three-way valve group.

[0012] In one optional implementation, when the temperature inside the SVG cabinet detected by the temperature sensor inside the SVG cabinet is greater than a first preset temperature or greater than the indoor temperature detected by the indoor temperature sensor inside the SVG cabinet, the controller controls the ventilation equipment to turn on; when the temperature inside the SVG cabinet is greater than the first preset temperature and less than or equal to a second preset temperature, the controller controls the ventilation equipment to automatically adjust its speed; when the temperature inside the SVG cabinet is greater than the second preset temperature, the controller controls the ventilation equipment to adjust to its maximum speed.

[0013] In this implementation, closed-loop control is used to analyze the temperature inside the cabinet in real time through temperature sensors and controllers, dynamically match the heat dissipation intensity, and reduce temperature fluctuations.

[0014] In one optional implementation, when the humidity detected by the air inlet humidity sensor is greater than the first preset humidity or the air inlet temperature detected by the air inlet temperature sensor is less than the third preset temperature, the controller controls the coils of the second and fourth contactors to be energized, controls the coils of the first and third contactors to be de-energized, closes the first and second air duct three-way valve groups, and the third preset temperature is less than the second preset temperature.

[0015] In this implementation, under high humidity or low temperature conditions, the forced full internal exhaust mode blocks external humid and cold air. Combined with the rapid response of sensors, this significantly reduces condensation and corrosion failures inside the equipment.

[0016] In one optional implementation, when the humidity of the air inlet detected by the air inlet humidity sensor is less than or equal to a first preset humidity, and the temperature of the air inlet detected by the air inlet temperature sensor is greater than or equal to a third preset temperature, the controller controls the coils of the first contactor and the third contactor to be energized, controls the coils of the second contactor and the fourth contactor to be de-energized, and opens the first air duct three-way valve group and the second air duct three-way valve group.

[0017] In one optional implementation, after the first and second air duct three-way valve groups are closed, when the indoor temperature of the SVG detected by the indoor temperature sensor of the SVG is greater than the first preset temperature, the controller controls the coils of the first and fourth contactors to be energized, and controls the coils of the second and third contactors to be de-energized, thereby opening the first air duct three-way valve group and closing the second air duct three-way valve group; when the indoor temperature of the SVG is greater than the second preset temperature, the controller controls the coils of the first and third contactors to be energized, and controls the coils of the second and fourth contactors to be de-energized, thereby opening the first and second air duct three-way valve groups.

[0018] The SVG power cabinet intelligent air-cooled circulation heat dissipation system provided by this utility model can switch between full internal exhaust, external exhaust, and mixed modes according to humidity or temperature through a three-way valve, optimize the heat exchange path, avoid ineffective circulation of hot and cold air, and is fully automated without human intervention. It prevents the equipment from freezing or condensing under high cold and high humidity conditions, prevents damage to electrical components, reduces equipment operating energy consumption, improves economic efficiency, enhances heat dissipation performance, and reduces equipment failure rate. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an intelligent air-cooled circulating heat dissipation system for an SVG power cabinet according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of a control mode for an intelligent air-cooled circulating heat dissipation system for an SVG power cabinet according to an embodiment of the present utility model. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] Traditional SVG power cabinet air-cooled systems typically employ a fixed cooling mode with constant frequency, constant airflow, and external circulation. The main drawbacks are: when the ambient temperature is high, the cooling effect is ineffective; prolonged operation at high temperatures can easily lead to aging of the equipment's insulation materials, resulting in overheating failures, shutdowns, insulation degradation, short circuits, or leakage accidents, causing equipment damage and personal injury. Because the cooling method is relatively simple and fixed, operation in harsh environments with high temperature and humidity during winter can easily lead to condensation on the equipment, reducing insulation strength and causing frequent damage to electronic components or short circuits. Furthermore, operation in a low-temperature, single external circulation mode can easily cause the indoor ambient temperature to drop, leading to ice formation and blockage of the circulation system's air inlets, resulting in poor heat dissipation, frequent overheating failures, and shutdowns.

[0026] The disadvantages of traditional SVG power cabinet water-cooling systems are: The water-cooling system has a complex design and manufacturing process; the heat exchange of the water circulation system is directly connected to the electrical equipment; and the high internal flow velocity makes it easy for static electricity to accumulate in high-impedance pipes, leading to high-voltage static creep, which can affect normal communication transmission or burn out electronic components. The high internal pressure of the water-cooling circulation system increases the difficulty of preventing liquid leakage. In addition, SVG equipment often operates at high temperatures, making the cooling system piping materials prone to aging, leakage, and burnout of electrical components. When the ambient temperature is low or the equipment is operating under long-term load, the external circulation section requires auxiliary heating equipment; otherwise, the liquid inside the external circulation pipes will freeze, causing leakage in the external circulation system and affecting the normal and reliable operation of the equipment.

[0027] Therefore, this application proposes an intelligent air-cooled circulating heat dissipation system for SVG power cabinets to stably control the temperature and humidity inside the SVG power cabinets and ensure stable operation of the equipment.

[0028] According to an embodiment of this utility model, an intelligent air-cooled circulation heat dissipation system for SVG power cabinets is provided. Please refer to [link / reference]. Figure 1 , Figure 1 This is a schematic diagram of an intelligent air-cooled circulating heat dissipation system for an SVG power cabinet according to an embodiment of the present invention. The SVG power cabinet is installed in the SVG equipment room, and the intelligent air-cooled circulating heat dissipation system for the SVG power cabinet includes a temperature and humidity sensor, a controller, ventilation equipment, an air duct switching device, and an air duct three-way valve.

[0029] The controller is connected to the temperature and humidity sensor, the ventilation equipment, and the duct switching device, respectively. The duct switching device is connected to the duct three-way valve.

[0030] Temperature and humidity sensors are used to detect temperature and humidity data in the intelligent air-cooled circulation heat dissipation system of the SVG power cabinet.

[0031] In one implementation, the temperature and humidity sensor includes an inlet temperature sensor, an inlet humidity sensor, an SVG indoor temperature sensor, and an SVG cabinet temperature sensor. The inlet temperature sensor and the inlet humidity sensor are located at the air inlet of the SVG equipment room; the inlet temperature sensor detects the inlet temperature, and the inlet humidity sensor detects the inlet humidity. The SVG indoor temperature sensor is located inside the SVG equipment room and detects the indoor temperature; the SVG cabinet temperature sensor is located inside the SVG power cabinet and detects the cabinet temperature.

[0032] The controller is used to receive temperature and humidity data and control the start, stop and speed of ventilation equipment, as well as the opening and closing of the duct switching device's three-way valve.

[0033] In one implementation, the controller includes a temperature and humidity module, a digital output module, and a communication module. The controller connects to a temperature and humidity sensor via the temperature and humidity module to collect temperature and humidity data from the sensor. The controller connects to a ventilation device via the communication module to control the start, stop, and speed of the ventilation device based on the temperature and humidity data. The controller connects to a duct switching device via the digital output module to control the duct switching device.

[0034] The SVG power cabinet intelligent air-cooled circulation heat dissipation system also includes a frequency converter. The controller is connected to the ventilation equipment through the frequency converter. The controller controls the opening and closing of the ventilation equipment and the speed of the ventilation equipment by adjusting the frequency converter.

[0035] The ventilation system consists of multiple cooling fans, and each ventilation device and air duct three-way valve corresponds to another ventilation device.

[0036] In one implementation, the ventilation equipment has six cooling fans, each corresponding to one of the six three-way valves in the air duct.

[0037] The duct switching device consists of multiple contactors, each controlling a separate duct three-way valve group. Each duct three-way valve group includes at least one duct three-way valve. The controller controls the opening or closing of the corresponding duct three-way valve group by energizing and de-energizing the contactor coils.

[0038] In one implementation, the contactor includes a first contactor, a second contactor, a third contactor, and a fourth contactor, each controlling a different duct three-way valve. The duct three-way valves include a first duct three-way valve, a second duct three-way valve, a third duct three-way valve, a fourth duct three-way valve, a fifth duct three-way valve, and a sixth duct three-way valve. The first, second, and third duct three-way valves are grouped as a first duct three-way valve group, and the fourth, fifth, and sixth duct three-way valves are grouped as a second duct three-way valve group.

[0039] When the coil of the first contactor is energized and the coil of the second contactor is de-energized, the first air duct three-way valve group opens; when the coil of the first contactor is de-energized and the coil of the second contactor is energized, the first air duct three-way valve group closes; when the coil of the third contactor is energized and the coil of the fourth contactor is de-energized, the second air duct three-way valve group opens; when the coil of the third contactor is de-energized and the coil of the fourth contactor is energized, the second air duct three-way valve group closes.

[0040] Further reading Figure 1 The SVG power cabinet's intelligent air-cooled circulation heat dissipation system includes a three-phase power input, L1, L2, L3, and N, protected by circuit breakers F1, F2, F3, and F4. The power supply is converted into voltage by a power converter for use by the controller.

[0041] Specifically, the power converter has a rated power of 50W, an input power of AC220V, and an output power of DC24V. F1 has a rated voltage of 380V and a rated current of 32A, while F2, F3, and F4 have a rated voltage of 230V and a rated current of 12A.

[0042] The frequency converter is connected to a three-phase power supply. It receives power input through the circuit breaker F1 via the R, S, and T terminals, and connects to and drives cooling fans M1-M6 via the U, V, and W terminals. Each cooling fan corresponds to one air duct.

[0043] Specifically, M1 corresponds to air duct #1, M2 corresponds to air duct #2, M3 corresponds to air duct #3, M4 corresponds to air duct #4, M5 corresponds to air duct #5, and M6 corresponds to air duct #6.

[0044] Specifically, the inverter has an input voltage of 380V, an output voltage of 380V, and a rated power of 7.5kW. The cooling fan is the original axial flow fan (1-6#), with a voltage of 380V and a power of 1.1kW.

[0045] The controller is a programmable logic controller (PLC) that communicates with the frequency converter via an RS485 communication interface and provides DC24V power to the temperature and humidity module and the digital output module.

[0046] Specifically, the controller is Beckhoff BX3100, the temperature and humidity module is Beckhoff KL4424, and the digital output module is Beckhoff KL2809.

[0047] The temperature and humidity module connects to the air outlet temperature sensor, the air inlet humidity sensor, the SVG indoor temperature sensor, and the SVG cabinet temperature sensor.

[0048] Specifically, the temperature sensor is PT100, the humidity sensor is HR202I, and the humidity sensor accuracy is ±3%RH.

[0049] The digital output module connects to multiple contactors KM1-KM4, which are used to control the switching of the state of each air duct three-way valve according to the output signal of the controller.

[0050] Specifically, KM1 controls the opening of the three-way valves for ducts 1-3, KM2 controls the closing of the three-way valves for ducts 1-3, KM3 controls the opening of the three-way valves for ducts 4-6, and KM4 controls the closing of the three-way valves for ducts 4-6.

[0051] Specifically, the coil voltage of KM1, KM2, KM3, and KM4 is DC24V, the rated current is 32A, the voltage of the three-way valves 1-6# in the air duct is 220V, the rated power is 6W, and the torque is 14N·m.

[0052] When the SVG device starts, the intelligent air-cooled circulating heat dissipation system of the SVG power cabinet begins to work. The inlet temperature sensor, inlet humidity sensor, SVG indoor temperature sensor, and SVG cabinet internal temperature sensor transmit temperature and humidity data to the controller in real time. The controller determines the inverter output frequency based on the received SVG cabinet internal temperature data, thereby controlling the start / stop and speed control of the cooling fan. Based on the inlet temperature, inlet humidity, and SVG indoor temperature data, it controls the opening and closing of the three-way valves in air ducts #1-#6, achieving three modes: full external exhaust, full internal exhaust, and partial external exhaust. According to this embodiment, an embodiment of the control mode of the intelligent air-cooled circulating heat dissipation system for SVG power cabinet is provided, applicable to... Figure 1 The SVG power cabinet features an intelligent air-cooled circulation cooling system. Please refer to [link / reference]. Figure 2 , Figure 2 This is a schematic diagram of a control mode for an intelligent air-cooled circulating heat dissipation system for an SVG power cabinet according to an embodiment of the present utility model.

[0053] When the temperature T1 inside the SVG cabinet detected by the SVG cabinet temperature sensor is greater than the first preset temperature or greater than the indoor temperature T2 detected by the SVG indoor temperature sensor, the inverter outputs 40Hz, and the controller controls the ventilation equipment to start at low speed.

[0054] When the temperature T1 inside the SVG cabinet is greater than the first preset temperature and less than or equal to the second preset temperature, the frequency converter outputs 40-50Hz, and the controller controls the ventilation equipment to automatically adjust its speed between low speed and full speed.

[0055] When the temperature T1 inside the SVG cabinet is greater than the second preset temperature, the frequency converter outputs 50Hz, and the controller controls the ventilation equipment to adjust to the maximum speed for full-speed operation.

[0056] When the inlet humidity sensor detects an inlet humidity RH1 greater than the first preset humidity or the inlet temperature sensor detects an inlet temperature T3 less than the third preset temperature, digital output modules 1 and 3 output 0V, and 2 and 4 output 24V. The controller energizes the contactor coils of the second contactor KM2 and the fourth contactor KM4, and de-energizes the contactor coils of the first contactor KM1 and the third contactor KM3, closing the first air duct three-way valve group 1#-3# and the second air duct three-way valve group 4#-6#, realizing full internal exhaust mode operation, and the air heat dissipation medium circulates in the SVG room.

[0057] When the inlet humidity sensor detects an inlet humidity RH1 that is less than or equal to the first preset humidity, and the inlet temperature sensor detects an inlet temperature T3 that is greater than or equal to the third preset temperature, digital output modules 1 and 3 output 24V, and 2 and 4 output 0V. The controller controls the contactor coils of the first contactor KM1 and the third contactor KM3 to be energized, and controls the contactor coils of the second contactor KM2 and the fourth contactor KM4 to be de-energized. This opens the first air duct three-way valve group 1#-3# and the second air duct three-way valve group 4#-6#, realizing full exhaust mode operation, with the air heat dissipation medium circulating in the outdoor air of the SVG.

[0058] After the first and second air duct three-way valve groups are closed, when the indoor temperature T2 detected by the SVG indoor temperature sensor is greater than the first preset temperature, digital output modules 1 and 4 output 24V, and 2 and 3 output 0V. The controller energizes the contactor coils of the first contactor KM1 and the fourth contactor KM4, and de-energizes the contactor coils of the second contactor KM2 and the third contactor KM3, thus opening the first air duct three-way valve group 1#-3# and closing the second air duct three-way valve group 4#-6#. The indoor circulation of the SVG device is shut down, enabling partial exhaust mode operation. When the indoor temperature T2 of the SVG is greater than the second preset temperature, digital output modules 1 and 3 output 24V, and modules 2 and 4 output 0V. The controller controls the contactor coils of the first contactor KM1 and the third contactor KM3 to be energized, and controls the contactor coils of the second contactor KM2 and the fourth contactor KM4 to be de-energized. The first air duct three-way valve group 1#-3# and the second air duct three-way valve group 4#-6# are opened to achieve full exhaust mode operation, directly exchanging the heat inside the SVG power cabinet with the outdoor ambient air.

[0059] For example, the first preset temperature is 25°C, the second preset temperature is 35°C, the third preset temperature is 10°C, and the first preset humidity is 85%.

[0060] The SVG power cabinet intelligent air-cooled circulation heat dissipation system provided by this utility model has the following advantages: It can achieve precise temperature control, improving heat dissipation efficiency by at least 20%. Specifically, through closed-loop control, the PT100 temperature sensor and controller analyze the cabinet temperature in real time, dynamically matching the heat dissipation intensity and reducing temperature fluctuations by ±1℃. Through mode switching, the three-way valve intelligently switches between full internal exhaust, external exhaust, and mixed modes based on humidity or temperature, optimizing the heat exchange path and avoiding ineffective circulation of hot and cold air.

[0061] It can reduce the risk of condensation by at least 90%. In particular, in high humidity or low temperature conditions, the forced full internal exhaust mode blocks external humid and cold air, and combined with the rapid response of the HR202 sensor, it significantly reduces condensation and corrosion failures inside the equipment.

[0062] It can achieve energy savings of 30-50%, resulting in annual electricity cost savings. Among them, the frequency converter adjusts the fan speed on demand, with a low-speed power consumption of only 0.3kW / unit. Six fans can save about 21,000kWh of electricity per year. The three-way valve has low standby power consumption of 6W / unit × 6 × start-stop time.

[0063] Provides multiple protections to ensure safety meets power grid assessment standards. Forced full-speed heat dissipation at high temperatures prevents IGBT (Insulated-Gate Bipolar Transistor) overheating damage. Redundant control of tiered air switches (32A / 12A) and contactors, along with automatic switching to a conservative heat dissipation strategy in case of sensor failure, ensures 99.9% operational availability.

[0064] Low retrofit cost and strong compatibility. The original fan is retained, with only a new three-way valve and controller added. Beckhoff's modular controller supports expansion, resulting in low retrofit cost and applicability to other power equipment cooling scenarios. Intelligent closed-loop control achieves a three-in-one effect of heat dissipation, anti-condensation, and energy saving, comprehensively improving the reliability and economy of SVG equipment.

[0065] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An intelligent air-cooled circulation cooling system for an SVG power cabinet, characterized in that, The system includes a temperature and humidity sensor, a controller, ventilation equipment, an air duct switching device, and an air duct three-way valve. The controller is connected to the temperature and humidity sensor, the ventilation equipment, and the air duct switching device. The air duct switching device is connected to the air duct three-way valve. The ventilation equipment and the air duct three-way valve are in one-to-one correspondence. The temperature and humidity sensor is used to detect the temperature and humidity data of the intelligent air-cooled circulation heat dissipation system of the SVG power cabinet. The controller is used to receive the temperature and humidity data and control the start, stop, and speed of the ventilation equipment, and control the air duct switching device to switch the opening and closing of the air duct three-way valve.

2. The intelligent air-cooled circulation cooling system for the SVG power cabinet according to claim 1, wherein, The SVG power cabinet is installed in the SVG equipment room. The temperature and humidity sensors include an air inlet temperature sensor, an air inlet humidity sensor, an SVG indoor temperature sensor, and an SVG cabinet temperature sensor. The air inlet temperature sensor and the air inlet humidity sensor are installed at the air inlet of the SVG equipment room. The SVG indoor temperature sensor is installed in the SVG equipment room. The SVG cabinet temperature sensor is installed inside the SVG power cabinet.

3. The intelligent air-cooled circulation cooling system for an SVG power cabinet of claim 1, wherein, The system also includes a frequency converter. The controller is connected to the ventilation equipment through the frequency converter. The controller includes a temperature and humidity module, a digital output module, and a communication module. The controller collects the temperature and humidity data from the temperature and humidity sensor through the temperature and humidity module, controls the duct switching device through the digital output module, and controls the output frequency of the frequency converter through the communication module to control the ventilation equipment.

4. The SVG power cabinet intelligent air-cooled circulation heat dissipation system according to any one of claims 1-3, characterized in that, The ventilation equipment consists of multiple cooling fans.

5. The SVG power cabinet intelligent air-cooled circulation heat dissipation system according to claim 2, characterized in that, The air duct switching device consists of multiple contactors, each contactor controlling a three-way valve group for the air duct. Each three-way valve group includes at least one three-way valve. The controller controls the opening or closing of the corresponding three-way valve group by controlling the energization and de-energization of the contactor coil.

6. The SVG power cabinet intelligent air-cooled circulation heat dissipation system according to claim 5, characterized in that, The contactor includes a first contactor, a second contactor, a third contactor, and a fourth contactor. The duct three-way valve includes a first duct three-way valve, a second duct three-way valve, a third duct three-way valve, a fourth duct three-way valve, a fifth duct three-way valve, and a sixth duct three-way valve. The first, second, and third duct three-way valves form a first duct three-way valve group, and the fourth, fifth, and sixth duct three-way valves form a second duct three-way valve group. The first contactor is used to control the opening of the first air duct three-way valve group, the second contactor is used to control the closing of the first air duct three-way valve group, the third contactor is used to control the opening of the second air duct three-way valve group, and the fourth contactor is used to control the closing of the second air duct three-way valve group.

7. The SVG power cabinet intelligent air-cooled circulation heat dissipation system according to claim 6, characterized in that, When the temperature inside the SVG cabinet detected by the temperature sensor inside the SVG cabinet is greater than the first preset temperature or greater than the indoor temperature of the SVG cabinet detected by the indoor temperature sensor inside the SVG cabinet, the controller controls the ventilation equipment to turn on. When the temperature inside the SVG cabinet is greater than the first preset temperature and less than or equal to the second preset temperature, the controller controls the ventilation equipment to automatically adjust its speed. When the temperature inside the SVG cabinet is greater than the second preset temperature, the controller controls the ventilation equipment to adjust to its maximum speed.

8. The SVG power cabinet intelligent air-cooled circulation heat dissipation system according to claim 7, characterized in that, When the humidity at the air inlet detected by the air inlet humidity sensor is greater than the first preset humidity or the temperature at the air inlet detected by the air inlet temperature sensor is less than the third preset temperature, the controller controls the coils of the second contactor and the fourth contactor to be energized, controls the coils of the first contactor and the third contactor to be de-energized, and closes the first air duct three-way valve group and the second air duct three-way valve group. The third preset temperature is lower than the second preset temperature.

9. The SVG power cabinet intelligent air-cooled circulation heat dissipation system according to claim 7, characterized in that, When the humidity at the air inlet detected by the air inlet humidity sensor is less than or equal to the first preset humidity, and the temperature at the air inlet detected by the air inlet temperature sensor is greater than or equal to the third preset temperature, the controller controls the coils of the first contactor and the third contactor to be energized, and controls the coils of the second contactor and the fourth contactor to be de-energized, thereby opening the first air duct three-way valve group and the second air duct three-way valve group.

10. The SVG power cabinet intelligent air-cooled circulation heat dissipation system according to claim 8, characterized in that, After the first air duct three-way valve group and the second air duct three-way valve group are closed, when the indoor temperature of the SVG detected by the SVG indoor temperature sensor is greater than the first preset temperature, the controller controls the coils of the first contactor and the fourth contactor to be energized, controls the coils of the second contactor and the third contactor to be de-energized, opens the first air duct three-way valve group, and closes the second air duct three-way valve group. When the indoor temperature of the SVG is greater than the second preset temperature, the controller controls the coils of the first contactor and the third contactor to be energized, controls the coils of the second contactor and the fourth contactor to be de-energized, and opens the first air duct three-way valve group and the second air duct three-way valve group.

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