A grid-side filter cabinet based on phase change cooling

Abstract

The utility model belongs to electrical technical field especially relates to a net side filter cabinet based on phase change cooling, including the cabinet body, setting in the phase change cooling electric reactor, filter capacitance, filter electric reactor, filter resistance, current sensor, circuit breaker, brake resistance, lightning arrester in the cabinet body, the phase change cooling electric reactor is fixed in the left lower part in the cabinet body, filter capacitance, filter electric reactor, filter resistance are fixed respectively in the phase change cooling electric reactor directly above, the circuit breaker is fixed in the right upper part in the cabinet body, the lightning arrester is fixed in the right side of cabinet body, and brake resistance is fixed in the right side of cabinet body through the insulating structural member, the phase change cooling electric reactor, filter resistance all adopt phase change cooling heat dissipation, and the gas collecting pipe of phase change cooling electric reactor, the liquid return pipe of phase change cooling electric reactor, the gas collecting pipe of filter resistance, the liquid return pipe of filter resistance are fixed on the cabinet body. Advantage: can effectively insulate the high salt fog, high humidity air in tower drum or fan bin, improves the service life of electrical components and structural components in the cabinet.

Description

Technical Field

[0001] This utility model belongs to the field of electrical technology, and in particular relates to a grid-side filter cabinet based on phase change cooling. Background Technology

[0002] With climate change and ever-increasing energy demands, wind power has gradually become an important energy option as a renewable energy source. However, the complexity and variability of the marine environment present many challenges to the design and operation of offshore wind power systems, one of which is converter cooling technology. The converter is a key device that converts the alternating current (AC) generated by the wind turbine into direct current (DC) suitable for the power grid. Its performance and reliability significantly impact the efficiency and sustainability of the wind power system. High-power converters require filter cabinets to remove high-order harmonics generated during operation, ensuring the purity of the output power.

[0003] Traditional filter cabinets rely on air cooling, which suffers from low efficiency in marine environments. Firstly, offshore wind turbine converters require robust cooling technology, but strong sea winds and high humidity reduce the filter cabinet's effectiveness, necessitating more efficient cooling methods. Liquid cooling systems are widely researched and applied, utilizing a cooling medium to transfer internal heat to the external environment. This method avoids direct impact from sea winds and seawater, improving heat dissipation. Secondly, offshore wind turbine converters and related equipment require strong corrosion and mold resistance. The high salt content and corrosiveness of seawater and air in the marine environment easily corrode metal materials, affecting the performance and lifespan of the converter and related equipment. Finally, the filter cabinets used in offshore wind turbine converters must also consider ease of installation and maintenance. Since offshore wind farms are generally located far from land, installation and maintenance present certain challenges.

[0004] With the continuous development and promotion of wind power technology, the scale of offshore wind power generation will be further expanded, which puts forward higher requirements for the performance and reliability of converters. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, the purpose of this utility model is to provide a grid-side filter cabinet based on phase change cooling, which effectively isolates the high salt spray and high humidity air inside the tower or fan silo, improves the service life of electrical and structural components inside the cabinet, effectively prevents accidents, improves the overall safety performance of the equipment, and controls the temperature rise inside the cabinet through copper busbars.

[0006] To achieve the above objectives, this utility model employs the following technical solution:

[0007] A grid-side filter cabinet based on phase change cooling includes a cabinet body, and a phase change cooling reactor, a filter capacitor, a filter reactor, a filter resistor, a current sensor, a circuit breaker, a braking resistor, a surge arrester, a reactor output copper busbar, a Hall effect busbar, a circuit breaker input copper busbar, a circuit breaker output copper busbar, a filter circuit copper busbar I, and a filter circuit copper busbar II, all installed inside the cabinet body.

[0008] The phase change cooling reactor is fixed in the lower left of the cabinet, and the filter capacitor, filter reactor, and filter resistor are fixed directly above the phase change cooling reactor. The circuit breaker is fixed in the upper right of the cabinet, the surge arrester is fixed in the right side of the cabinet, and the braking resistor is fixed in the right side of the cabinet through an insulating structural component.

[0009] The phase change cooling reactor and the filter resistor both adopt phase change cooling heat dissipation. The gas collecting pipe of the phase change cooling reactor, the liquid return pipe of the phase change cooling reactor, the gas collecting pipe of the filter resistor, and the liquid return pipe of the filter resistor are fastened to the cabinet by pipe clamps.

[0010] The reactor output copper busbar is connected to the output copper busbar on the right side of the phase change cooling reactor. The circuit breaker input copper busbar is connected to the input copper busbar on the upper side of the circuit breaker. The Hall effect tube passes through the center of the current sensor and is connected to the reactor output copper busbar and the circuit breaker input copper busbar respectively. The circuit breaker output copper busbar is connected to the circuit breaker output copper busbar and is fixedly connected to the cabinet through insulating structural components. The surge arrester is connected to the circuit breaker output copper busbar through a high-voltage cable. The filter resistor is connected to the filter reactor through a high-voltage cable. The filter resistor is connected in parallel with the reactor output copper busbar through filter circuit copper busbar II and filter circuit copper busbar II.

[0011] The gas collecting pipe of the phase change cooling reactor, the liquid return pipe of the phase change cooling reactor, the gas collecting pipe of the filter resistor, and the liquid return pipe of the filter resistor are all connected to the condenser outside the cabinet through pipes, and the condenser is filled with cooling working fluid.

[0012] The interfaces of the gas collecting pipe of the phase change cooling reactor, the liquid return pipe of the phase change cooling reactor, the gas collecting pipe of the filter resistor, and the liquid return pipe of the filter resistor are all located on the top of the cabinet.

[0013] The current sensor is fixed to a metal structural component via a Hall effect sensor, and the metal structural component is fixed to the middle of the cabinet.

[0014] An insulating partition is fixed in the middle of the cabinet, which divides the cabinet into two compartments, left and right. The phase change cooling reactor, filter capacitor, filter reactor and filter resistor are located in the left compartment, and the current sensor, circuit breaker, braking resistor and surge arrester are located in the right compartment.

[0015] The pipe clamps include OD50 pipe clamps and OD40 pipe clamps. The gas collecting pipe and the liquid return pipe of the reactor are fastened to the sheet metal structural parts in the cabinet by OD50 pipe clamps, and the gas collecting pipe and the liquid return pipe of the filter resistor are fastened to the sheet metal structural parts in the cabinet by OD40 pipe clamps.

[0016] The cabinet is a hinged cabinet. The front of the cabinet is connected to a double-door front door via a hinge, and the rear is fixedly connected to a rear door via bolts. The cabinet is equipped with a waterproof groove, and sealing strips are installed between the waterproof groove and the front and rear doors.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1) This utility model adopts a cabinet-type structure with a sufficiently high protection level, which can effectively isolate the high salt spray and high humidity air inside the tower or fan silo, and improve the service life of electrical and structural components inside the cabinet; it can also effectively prevent accidents, improve the overall safety performance of the equipment, and extend the maintenance frequency.

[0019] 2) All primary circuits of this utility model are connected with copper busbars. The high current carrying capacity makes the current transmission more reliable and stable. The heat generation of the copper busbars can also be controlled by selecting the specifications of the copper busbars to achieve the purpose of controlling the temperature rise inside the cabinet.

[0020] 3) Compared with traditional water cooling, this utility model's grid-side filter cabinet based on phase change cooling improves heat dissipation efficiency, enhances corrosion resistance and mildew resistance, and optimizes installation and maintenance convenience, thereby meeting the high performance and high reliability requirements of offshore wind power systems for converters and filter cabinets. Replacing the water cooling system with a condenser significantly reduces costs, noise, and space requirements. Phase change cooling technology utilizes the phase change characteristics of matter to absorb or release a large amount of heat without changing the temperature, thus achieving an effective cooling effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a left view of the right-hand compartment.

[0023] Figure 3 This is a right view of the left-side compartment.

[0024] In the diagram: 1. Cabinet; 2. Phase change cooling reactor; 3. Filter capacitor; 4. Filter reactor; 5. Filter resistor; 6. Current sensor; 7. Circuit breaker; 8. Braking resistor; 9. Surge arrester; 10. Reactor output copper busbar; 11. Hall effect tube; 12. Circuit breaker input copper busbar; 13. Circuit breaker output copper busbar; 14. Filter circuit copper busbar I; 15. Filter circuit copper busbar II; 16. Reactor gas collector; 17. Reactor return pipe; 18. Filter resistor gas collector; 19. Filter resistor return pipe; 20. Pipe clamp; 21. Insulating partition. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0026] See Figures 1-3 A grid-side filter cabinet based on phase change cooling is disclosed, which can be used in offshore wind power converters with a rated voltage of 3.3kV and a rated current of 2kA. It is in the form of a cabinet 1, in which reactors and other components are arranged. The main circuit is connected by busbars, and cooling pipes are installed inside the cabinet. The main heat-generating components are cooled by phase change cooling, meeting the relevant industry, electrical, and mechanical national standards. Specifically, it includes a cabinet 1, and within the cabinet 1, a phase change cooling reactor 2, a filter capacitor 3, a filter reactor 4, a filter resistor 5, a current sensor 6, a circuit breaker 7, a braking resistor 8, a surge arrester 9, a reactor output copper busbar 10, a Hall effect busbar 11, a circuit breaker input copper busbar 12, a circuit breaker output copper busbar 13, a filter circuit copper busbar I 14, and a filter circuit copper busbar II 15.

[0027] An insulating partition 21 is fixedly connected in the middle of cabinet 1, dividing the interior of cabinet 1 into two compartments, left and right. The left compartment contains electrical components such as a phase-change cooling reactor 2, a filter capacitor 3, a filter reactor 4, and a filter resistor 5. Several sheet metal structural components are fixed inside cabinet 1 to support and fix the equipment inside. The phase-change cooling reactor is fixed to the base of cabinet 1. The filter capacitor 3 and the filter reactor 4 are respectively fixed to the sheet metal structural components. A polytetrafluoroethylene gasket is installed between the filter capacitor 3 and the sheet metal structural component to reduce friction during installation and maintenance, and to prevent the capacitor from scratching the paint on the sheet metal component. The filter resistor 5 is fixed to an insulating beam, which is fixed between the sheet metal structural component (on which the filter reactor 4 is fixed) and the top of cabinet 1. The right-side compartment contains electrical components such as a current sensor 6, a circuit breaker 7, a braking resistor 8, and a surge arrester 9. The current sensor 6 has a central cutout through which a Hall effect sensor bar 11 passes and is fixed to a sheet metal structural component. The circuit breaker 7 and surge arrester 9 are also fixed to sheet metal structural components. The braking resistor 8 is fixed to an insulating structural component, which is located on the right side of the cabinet 1. This structure, using insulating partitions 21 to separate compartments, reduces electromagnetic interference. Furthermore, separating equipment using different heat dissipation methods into different compartments maintains normal heat dissipation for the equipment and improves the overall heat dissipation efficiency of the cabinet 1.

[0028] The main electrical circuit connection structure of the grid-side filter cabinet is as follows: the phase-change cooling reactor 2 is fixed longitudinally, and the copper busbar on the right side is the outgoing line side. The phase sequence from front to back is A, B, and C. The three reactor outgoing copper busbars 10 are connected to it respectively. The three Hall effect tubes 11 are connected to the three reactor outgoing copper busbars 10 respectively. The three circuit breaker incoming copper busbars 12 are connected to the three Hall effect tubes 11 respectively. The other end of the circuit breaker incoming copper busbar 12 is connected to the upper outgoing copper busbar of the circuit breaker 7. The three circuit breaker outgoing copper busbars 13 are connected to the lower outgoing copper busbar of the circuit breaker 7 respectively. The three circuit breaker outgoing copper busbars 13 are fixedly connected to the cabinet body 1 through insulating structural components. The upper terminals of the surge arresters 9 on the lower right of the circuit breaker 7 are connected to the three circuit breaker outgoing copper busbars 13 respectively using high-voltage cables. The lower terminals of the three surge arresters 9 are connected to a grounding copper busbar. The specific connection structure of the filter circuit is as follows: the terminals of the six filter resistors 5 are connected in parallel with the three copper busbars of the filter reactor 4 using high-voltage cables, and these three copper busbars are connected together using copper busbars. The other three copper busbars of the filter reactor 4 are connected to the three copper busbars I14 and II15 of the filter circuit, and then connected in parallel with the three copper busbars 10 of the reactor output. Among them, the current carrying capacity of the reactor output copper busbar 10, Hall effect busbar 11, circuit breaker incoming copper busbar 12, and circuit breaker outgoing copper busbar 13 all meet the requirement of 2kA, and the current carrying capacity of the filter circuit copper busbar 1 and filter circuit copper busbar 2 meets the requirement of 240A.

[0029] The main heat-generating components inside the power grid-side filter cabinet are all phase-change cooling devices, including phase-change cooling reactor 2 and filter resistor 5. Phase-change cooling reactor 2 has two gas collection ports and two liquid return ports. The gas collection manifold is symmetrically fixed to the left and right sides at the top center of the reactor body, and the liquid return manifold is symmetrically fixed to the left and right sides at the bottom center of the reactor body. The two reactor gas collection pipes 16 are vertically fixed to the sheet metal structure using OD50 pipe clamps 20, and are secured to the reactor gas collection ports with bolts and end faces sealed. The two reactor liquid return pipes 17 are vertically fixed to the sheet metal structure using OD50 pipe clamps 20, and are secured to the reactor liquid return ports with threads using unions and end faces sealed. There are three sets of filter resistors 5, with two units fixed to the same aluminum alloy heat sink. Each heat sink has two gas collection ports and one liquid return port. The filter resistor gas collection pipe 18 is fixed directly above the three heat sinks and is threaded (the filter resistor gas collection pipe 18 is threaded to the heat sink) with a sealed end face. The filter resistor liquid return pipe 19 is fixed diagonally above the three heat sinks and is also threaded (the filter resistor liquid return pipe 19 is threaded to the heat sink) with a sealed end face. Both the filter resistor gas collection pipe 18 and the filter resistor liquid return pipe 19 are fixed to the sheet metal structure using two OD40 pipe clamps 20. The reactor gas collection pipe 16 and the filter resistor gas collection pipe 18 are straight and without bends, facilitating faster delivery of the vaporized cooling fluid to the condenser. The reactor liquid return pipe 17 and the filter resistor liquid return pipe 19 can use 90° bends, as the cooling fluid flows rapidly downwards due to its own gravity. The interfaces of the gas collecting pipe of the phase change cooling reactor 2, the liquid return pipe of the phase change cooling reactor 2, the gas collecting pipe of the filter resistor 5, and the liquid return pipe of the filter resistor 5 are all located on the top of the cabinet 1. Furthermore, the gas collecting pipe of the phase change cooling reactor 2, the liquid return pipe of the phase change cooling reactor 2, the gas collecting pipe of the filter resistor 5, and the liquid return pipe of the filter resistor 5 are all connected to the condenser outside the cabinet 1 through pipes, and the condenser is filled with cooling working fluid.

[0030] Cabinet 1 is a hinged cabinet. The front of cabinet 1 is connected to a front door, which is a double door with a hinge. A rear door is bolted to the rear of cabinet 1, sealing the rear. Cabinet 1 has a waterproof groove, which is either fixed to the frame of cabinet 1 by sheet metal bending or integrally formed. The waterproof groove is tightly pressed against the front and rear doors by clamp-type sealing strips. Cabinet 1 has an IP54 protection rating. The corrosion resistance level of the cabinet shell meets C4-M standards, and the corrosion resistance level of the internal sheet metal structural components meets C3-M standards. The anti-corrosion coating has a durability of no less than 20 years.

[0031] This utility model adopts a single-type cabinet structure with a sufficiently high protection level, effectively isolating the high salt spray and high humidity air inside the tower or wind turbine nacelle, thus extending the service life of electrical and structural components within the cabinet. It also effectively prevents accidents, improves the overall safety performance of the equipment, and extends maintenance frequency. The primary circuit uses copper busbars for connection, and the high current-carrying capacity makes current transmission more reliable and stable. The heat generation of the copper busbars can also be controlled by selecting the appropriate specifications to manage the temperature rise within the cabinet. Compared to traditional water cooling, the grid-side filter cabinet based on phase change cooling improves heat dissipation efficiency, enhances corrosion and mold resistance, and optimizes installation and maintenance convenience, thereby meeting the high performance and high reliability requirements of offshore wind power systems for converters and filter cabinets. Replacing the water cooling system with a condenser significantly reduces costs, noise, and space requirements. Phase change cooling technology utilizes the phase change characteristics of matter to absorb or release a large amount of heat without changing the temperature, thus achieving effective cooling.

[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", 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 are not intended to 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.

[0033] Through the above specific embodiments, those skilled in the art can easily implement this utility model. However, it should be understood that this utility model is not limited to the specific embodiments described above. Based on the disclosed embodiments, those skilled in the art can arbitrarily combine different technical features to achieve different technical solutions. Due to space limitations and for the sake of brevity, not all of these combined solutions have been described. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A grid-side filter cabinet based on phase change cooling, characterized in that, Includes the cabinet, and the phase change cooling reactor, filter capacitor, filter reactor, filter resistor, current sensor, circuit breaker, braking resistor, surge arrester, reactor output copper busbar, Hall effect busbar, circuit breaker input copper busbar, circuit breaker output copper busbar, filter circuit copper busbar I, and filter circuit copper busbar II installed inside the cabinet. The phase change cooling reactor is fixed in the lower left of the cabinet, and the filter capacitor, filter reactor, and filter resistor are fixed directly above the phase change cooling reactor. The circuit breaker is fixed in the upper right of the cabinet, the surge arrester is fixed in the right side of the cabinet, and the braking resistor is fixed in the right side of the cabinet through an insulating structural component. The phase change cooling reactor and the filter resistor both adopt phase change cooling heat dissipation. The gas collecting pipe of the phase change cooling reactor, the liquid return pipe of the phase change cooling reactor, the gas collecting pipe of the filter resistor, and the liquid return pipe of the filter resistor are fastened to the cabinet by pipe clamps. The reactor output copper busbar is connected to the output copper busbar on the right side of the phase change cooling reactor. The circuit breaker input copper busbar is connected to the input copper busbar on the upper side of the circuit breaker. The Hall effect tube passes through the center of the current sensor and is connected to the reactor output copper busbar and the circuit breaker input copper busbar respectively. The circuit breaker output copper busbar is connected to the circuit breaker output copper busbar and is fixedly connected to the cabinet through insulating structural components. The surge arrester is connected to the circuit breaker output copper busbar through a high-voltage cable. The filter resistor is connected to the filter reactor through a high-voltage cable. The filter resistor is connected in parallel with the reactor output copper busbar through filter circuit copper busbar II and filter circuit copper busbar II.

2. The grid-side filter cabinet based on phase change cooling according to claim 1, characterized in that, The gas collecting pipe of the phase change cooling reactor, the liquid return pipe of the phase change cooling reactor, the gas collecting pipe of the filter resistor, and the liquid return pipe of the filter resistor are all connected to the condenser outside the cabinet through pipes, and the condenser is filled with cooling working fluid.

3. A grid-side filter cabinet based on phase change cooling according to claim 1, characterized in that, The interfaces of the gas collecting pipe of the phase change cooling reactor, the liquid return pipe of the phase change cooling reactor, the gas collecting pipe of the filter resistor, and the liquid return pipe of the filter resistor are all located on the top of the cabinet.

4. A grid-side filter cabinet based on phase change cooling according to claim 1, characterized in that, The current sensor is fixed to a metal structural component via a Hall effect sensor, and the metal structural component is fixed to the middle of the cabinet.

5. A grid-side filter cabinet based on phase change cooling according to claim 1, characterized in that, An insulating partition is fixed in the middle of the cabinet, which divides the cabinet into two compartments, left and right. The phase change cooling reactor, filter capacitor, filter reactor and filter resistor are located in the left compartment, and the current sensor, circuit breaker, braking resistor and surge arrester are located in the right compartment.

6. A grid-side filter cabinet based on phase change cooling according to claim 1, characterized in that, The pipe clamps include OD50 pipe clamps and OD40 pipe clamps. The gas collecting pipe and the liquid return pipe of the reactor are fastened to the sheet metal structural parts in the cabinet by OD50 pipe clamps, and the gas collecting pipe and the liquid return pipe of the filter resistor are fastened to the sheet metal structural parts in the cabinet by OD40 pipe clamps.

7. A grid-side filter cabinet based on phase change cooling according to claim 1, characterized in that, The cabinet is a hinged cabinet. The front of the cabinet is connected to a double-door front door via a hinge, and the rear is fixedly connected to a rear door via bolts. The cabinet is equipped with a waterproof groove, and sealing strips are installed between the waterproof groove and the front and rear doors.

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