Converter cabinet of bidirectional converter and bidirectional converter

Abstract

The utility model provides a kind of converter cabinet and bidirectional converter of bidirectional converter, wherein converter cabinet includes: cabinet, first fan, second fan;Cabinet has to set first chamber and second chamber, first chamber is located above second chamber;On the side wall of one side of the front and rear side of cabinet, cabinet has first air inlet, and second air inlet;On the side wall of the top of cabinet, cabinet has first air outlet;On the side wall of the other side of the front and rear side of cabinet, cabinet also has the second air outlet of second air inlet opposite arrangement;First fan is arranged in first air outlet, for making air by first air inlet into first chamber, and by first air outlet after flowing through converter component and discharging;Second fan is arranged in second chamber, for making air by second air inlet into second chamber, and by second air outlet after flowing through output filter component and discharging.The utility model can realize efficient heat dissipation, ensure to realize the high integration of electronic device in cabinet.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, and in particular to a converter cabinet and a bidirectional converter. Background Technology

[0002] The bidirectional converter combines the traction power supply capability of a rectifier unit with the braking feedback capability of an energy feeder, and is known as a new generation of bidirectional converter system for urban rail transit traction power supply. The bidirectional converter can significantly improve energy efficiency and optimize the power supply environment, representing the future development direction for urban rail transit traction power supply systems.

[0003] In existing bidirectional converters, the internal electronic components of the converter cabinet have low heat dissipation efficiency. Due to the low heat dissipation efficiency of the internal electronic components, it is necessary to adopt methods such as configuring large-volume chambers and increasing the spacing between internal components for heat dissipation. This results in low integration of electronic components inside the converter cabinet, which in turn leads to a large size of the bidirectional converter. Utility Model Content

[0004] This utility model provides a converter cabinet and a bidirectional converter to solve the problems of low heat dissipation efficiency of internal electronic components in the converter cabinet, low integration of electronic components in the converter cabinet, and large size of the bidirectional converter in existing bidirectional converters.

[0005] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0006] In a first aspect, this utility model embodiment provides a converter cabinet for a bidirectional converter, comprising: a cabinet body, a first fan, and a second fan;

[0007] The cabinet has a first chamber for housing the converter assembly and a second chamber for housing the output filter assembly, with the first chamber located above the second chamber;

[0008] On one side wall of the front and rear sides of the cabinet, the cabinet has a first air inlet communicating with the first chamber and a second air inlet communicating with the second chamber;

[0009] On the top side wall of the cabinet, the cabinet has a first air outlet communicating with the first chamber; on the other side wall of the front and rear sides of the cabinet, the cabinet also has a second air outlet communicating with the second chamber and being positioned opposite the second air inlet.

[0010] The first fan is located at the first air outlet and is used to allow air to enter the first chamber through the first air inlet, flow through the converter assembly, and then be discharged from the first air outlet.

[0011] The second fan is located in the second chamber and is used to allow air to enter the second chamber through the second air inlet, flow through the output filter assembly, and then be discharged through the second air outlet.

[0012] Optionally,

[0013] The first chamber includes a first sub-chamber and a second sub-chamber that are interconnected, with the first sub-chamber located in front of the second sub-chamber.

[0014] The converter component includes: a power unit, a supporting capacitor assembly, and a capacitor busbar;

[0015] The power unit is located in the first sub-chamber and has multiple units arranged in a vertical direction;

[0016] The supporting capacitor assembly is disposed on one side wall of the left or right side of the second sub-chamber. Each power unit is provided with a corresponding supporting capacitor assembly. The power unit is electrically connected to the supporting capacitor assembly through the capacitor busbar.

[0017] Optionally, each of the power units is arranged laterally, and every three power units constitute a UVW three-phase unit.

[0018] The three power units of the same UVW three-phase unit are electrically connected to their respective supporting capacitor components through a capacitor busbar.

[0019] Optionally, the first chamber also includes a current-sharing reactor;

[0020] The current sharing reactor is located on the side wall of the other side of the left and right sides of the second sub-chamber, and there are multiple reactors that correspond one-to-one with the UVW three-phase units. The multiple current sharing reactors are arranged at intervals in the vertical direction.

[0021] The current sharing reactor is connected to the three power units of the corresponding UVW three-phase unit, and the current sharing reactor is also electrically connected to the output filter component.

[0022] Optionally, the output filtering component includes a three-phase AC filter reactor.

[0023] Optionally, the first chamber includes a first sub-chamber and a second sub-chamber that are interconnected, with the first sub-chamber located in front of the second sub-chamber.

[0024] The converter component includes:

[0025] A power unit, wherein the power unit is disposed in the first sub-chamber and has a plurality of units arranged in a vertical direction;

[0026] A flow guiding structure is provided between the first air inlet and each of the power units, and the flow guiding structure is used to guide air from the first air inlet to the corresponding power unit.

[0027] Optionally, it also includes:

[0028] A frame circuit breaker is located in the second chamber;

[0029] The second fan is also used to allow air to flow through the frame circuit breaker and then be discharged through the second air outlet shown.

[0030] Optionally, the first fan includes: a centrifugal fan; and / or,

[0031] The second fan includes: an axial flow fan.

[0032] Optionally, both the first air inlet and the second air inlet have an air filtration structure.

[0033] Secondly, the present invention provides a bidirectional converter, including the converter cabinet of the bidirectional converter as described in any one of the first aspects.

[0034] Optionally, it further includes: a switch control cabinet, wherein there are at least two converter cabinets, and the switch control cabinet and the at least two converter cabinets are arranged side by side.

[0035] In this embodiment of the invention, a cabinet, a first fan, and a second fan are included. The cabinet has a first chamber for housing a converter assembly and a second chamber for housing an output filter assembly, with the first chamber located above the second chamber. On one side wall of the front and rear sides of the cabinet, a first air inlet communicating with the first chamber and a second air inlet communicating with the second chamber are provided. On the side wall of the top of the cabinet, a first air outlet communicating with the first chamber is provided. On the other side wall of the front and rear sides of the cabinet, a second air outlet communicating with the second chamber and positioned directly opposite the second air inlet is provided. Air outlets; a first fan is located at the first air outlet to allow air to enter the first chamber through the first air inlet, flow through the converter component, and then exit through the first air outlet; a second fan is located in the second chamber to allow air to enter the second chamber through the second air inlet, flow through the output filter component, and then exit through the second air outlet. Both the first and second chambers are equipped with fans, forming independent heat dissipation ducts in the two chambers respectively. This enables efficient heat dissipation for the converter component in the first chamber and the output filter component in the second chamber, ensuring a high degree of integration of electronic components within the cabinet and reducing the size of the bidirectional converter. Attached Figure Description

[0036] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0037] Figure 1 This is a front view schematic diagram of the internal structure of the converter cabinet of the bidirectional converter according to an embodiment of the present utility model;

[0038] Figure 2 For corresponding Figure 1 A schematic diagram of the internal structure of the converter cabinet of the bidirectional converter in this embodiment of the present invention, viewed from the perspective of CC.

[0039] Figure 3A For the corresponding Figure 2 One of the cross-sectional schematic diagrams of the internal structure of the converter cabinet of the bidirectional converter of this utility model from the perspective of AA, wherein the capacitor busbar is retained;

[0040] Figure 3B For the corresponding Figure 2 The second cross-sectional view of the internal structure of the converter cabinet of the bidirectional converter of this utility model embodiment from the perspective of AA, wherein the capacitor busbar is not retained;

[0041] Figure 3C This is a schematic diagram of the power unit structure;

[0042] Figure 4 For the corresponding Figure 2 A cross-sectional schematic diagram of the internal structure of the converter cabinet of the bidirectional converter of this utility model embodiment from a mid-BB perspective;

[0043] Figure 5 For the corresponding Figure 3A A magnified view of the area at position N;

[0044] Figure 6 For the corresponding Figure 3A A magnified view of the area at position M in the middle;

[0045] Figure 7 This is a front view schematic diagram of the bidirectional converter according to an embodiment of this utility model;

[0046] Figure 8 This is a rear view schematic diagram of the bidirectional converter according to an embodiment of the present invention;

[0047] in:

[0048] 100. Cabinet body; 101. First chamber; 102. Second chamber;

[0049] 201, First air inlet; 202, Second air inlet; 301, First air outlet; 302, Second air outlet; 302a, Protective structure;

[0050] 1. First fan; 2. Second fan;

[0051] 3. Converter assembly; 31. Power unit; 31a. Width side of power unit; 32. Supporting capacitor assembly; 33. Capacitor busbar; 33a. Airflow opening; 34. Current sharing reactor;

[0052] 4. Output filter assembly; 5. Frame circuit breaker; 6. Flow guiding structure; 7. Air filter structure; 8. Switch control cabinet; 9. Channel steel base. Detailed Implementation

[0053] 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.

[0054] The terms "first," "second," etc., used in this embodiment of the invention are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of the invention can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, without limiting the number of objects; for example, the first object can be one or more. Furthermore, in this embodiment of the invention, "or" indicates at least one of the connected objects. For example, "A or B" covers three scenarios: Scenario 1: including A but not B; Scenario 2: including B but not A; Scenario 3: including both A and B. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0055] In the technical solutions of this utility model embodiment, terms such as "connection," "coupling," or "linked" are not limited to physical or mechanical connections, but can include electrical connections.

[0056] 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.

[0057] It should be noted that in the accompanying drawings, the hollow arrows indicate the direction of airflow. In this embodiment of the invention, the descriptions of front-back, left-right, and up-down positions are all based on the perspective definition of looking directly at the cabinet 100 under the on-site arrangement of the bidirectional converter.

[0058] This utility model embodiment provides a converter cabinet for a bidirectional converter. See [link to relevant documentation] Figure 1 , Figure 2 , Figure 3A and Figure 4 As shown, it includes: cabinet 100, first fan 1, and second fan 2;

[0059] The cabinet 100 has a first chamber 101 for housing the converter assembly 3 and a second chamber 102 for housing the output filter assembly 4, with the first chamber 101 located above the second chamber 102;

[0060] On one side wall of the front and rear sides of the cabinet 100, the cabinet 100 has a first air inlet 201 communicating with the first chamber 101 and a second air inlet 202 communicating with the second chamber 102.

[0061] On the top side wall of the cabinet 100, the cabinet 100 has a first air outlet 301 that communicates with the first chamber 101; on the other side wall of the front and rear sides of the cabinet 100, the cabinet 100 also has a second air outlet 302 that communicates with the second chamber 102 and is positioned opposite the second air inlet 202.

[0062] The first fan 1 is located at the first air outlet 301 and is used to allow air to enter the first chamber 101 from the first air inlet 201, and then be discharged from the first air outlet 301 after passing through the flow converter 3.

[0063] The second fan 2 is located in the second chamber 102 and is used to allow air to enter the second chamber 102 through the second air inlet 202, and then be discharged through the second air outlet 302 after passing through the output filter assembly 4.

[0064] It should be noted that during the process of the first fan 1 bringing air into the first chamber 101 through the first air inlet 201 and flowing through the converter component 3 before being discharged through the first air outlet 301, the air can carry away the heat of the converter component 3, thereby achieving cooling and helping to achieve high-performance operation of the converter component 3.

[0065] The second fan 2 allows air to enter the second chamber 102 through the second air inlet 202, and then flow through the output filter assembly 4 before being discharged through the second air outlet 302. During this process, the air can carry away the heat generated by the output filter assembly 4 during operation, thereby achieving cooling and helping to achieve high-performance operation of the output filter assembly 4.

[0066] In this embodiment of the invention, the independent design of the first chamber 101 and the second chamber 102 effectively avoids the superposition of heat generated by the converter component 3 and the output filter component 4 during heat exchange, thus dispersing heat, improving heat dissipation conditions, and ensuring the safe and stable operation of the converter. Furthermore, by separately setting the first fan 1 to dissipate heat from the converter component 3 and the second fan 2 to dissipate heat from the output filter component 4, the airflow generated by the two fans during heat dissipation will not interfere with each other, thereby improving the heat dissipation efficiency of the converter component 3 and the output filter component 4.

[0067] In this embodiment of the invention, a cabinet 100, a first fan 1, and a second fan 2 are included. The cabinet 100 has a first chamber 101 for housing a converter assembly 3 and a second chamber 102 for housing an output filter assembly 4. The first chamber 101 is located above the second chamber 102. On one side wall of the front and rear sides of the cabinet 100, the cabinet 100 has a first air inlet 201 communicating with the first chamber 101 and a second air inlet 202 communicating with the second chamber 102. On the side wall of the top of the cabinet 100, the cabinet 100 has a first air outlet 301 communicating with the first chamber 101. On the other side wall of the front and rear sides of the cabinet 100, the cabinet 100 also has a second air outlet 301 communicating with the second chamber 102 and the second air inlet 202. 2. The second air outlet 302 is directly opposite to the first air outlet 301. The first fan 1 is located at the first air outlet 301 and is used to allow air to enter the first chamber 101 from the first air inlet 201, flow through the converter component 3 and then be discharged from the first air outlet 301. The second fan 2 is located in the second chamber 102 and is used to allow air to enter the second chamber 102 from the second air inlet 202, flow through the output filter component 4 and then be discharged from the second air outlet 302. Both the first chamber 101 and the second chamber 102 are equipped with fans, forming independent heat dissipation air ducts in the two chambers respectively. This can achieve efficient heat dissipation for the converter component 3 in the first chamber 101 and the output filter component 4 in the second chamber, ensuring the high integration of electronic components in the cabinet 100 and reducing the volume of the bidirectional converter.

[0068] In some embodiments of this invention, optionally, the first chamber 101 includes a first sub-chamber and a second sub-chamber that are interconnected, with the first sub-chamber located in front of the second sub-chamber.

[0069] The converter component 3 includes: a power unit 31, a supporting capacitor assembly 32, and a capacitor busbar 33;

[0070] The power unit 31 is located in the first sub-chamber and has multiple units arranged in a vertical direction;

[0071] The supporting capacitor assembly 32 is located on one side wall of the left and right sides of the second sub-chamber. Each power unit 31 is provided with a corresponding supporting capacitor assembly 32. The power unit 31 is electrically connected to the supporting capacitor assembly 32 through the capacitor busbar 33.

[0072] In this embodiment of the present invention, the power unit 31 may include at least one of the following devices: a heat sink, an IGBT (Insulated Gate Bipolar Transistor) module, and a single board (also known as a single board machine).

[0073] It should be noted that during the process of the first fan 1 bringing air into the first chamber 101 through the first air inlet 201 and flowing through the converter assembly 3 before being discharged through the first air outlet 301, the air can carry away the heat of the power unit 31, the supporting capacitor assembly 32, and the capacitor busbar 33, thereby achieving cooling and helping to achieve high-performance operation of the above-mentioned devices.

[0074] In some alternative embodiments, an electrical connector (quick-connector) can also be used to make an electrical connection between the support capacitor assembly 32 and the power unit 31.

[0075] In this embodiment of the present invention, by arranging the supporting capacitor assembly 32 and the power unit 31 separately, the volume and weight of the converter assembly 3 can be greatly reduced, and the maintenance convenience of the converter assembly 3 can be improved.

[0076] It should be noted that the number and position of the supporting capacitors in the supporting capacitor assembly 32 can be adjusted according to design requirements, and this embodiment of the present invention does not impose any restrictions on this.

[0077] In some embodiments of this utility model, optionally,

[0078] Each power unit 31 is arranged laterally, and every three power units 31 constitute a UVW three-phase unit.

[0079] The three power units of the same UVW three-phase unit are electrically connected to their respective supporting capacitor components 32 through a capacitor bus 33.

[0080] In some embodiments of this utility model, optionally, see [reference needed]. Figure 2 , Figure 3A , Figure 3B As shown, there are 6 power units 31, all arranged horizontally. Among them, 3 power units 31 constitute one UVW three-phase unit, and 3 power units 31 constitute another UVW three-phase unit; there are two capacitor busbars 33.

[0081] The supporting capacitor is fixed to the component by bolts to form a supporting capacitor assembly 32. The supporting capacitor assembly 32 is provided with positioning pins, and the cabinet 100 is provided with positioning pin holes, which can facilitate the installation and removal of the supporting capacitor assembly 32. The supporting capacitor is connected to the power unit 31 through a busbar. Every three sets of supporting capacitor assemblies 32 share a capacitor busbar 33, which can greatly reduce the parasitic inductance on the capacitor busbar 33. In addition, the wiring design of the capacitor busbar 33 is simpler. The upper part of the capacitor busbar 33 is provided with positioning holes, and the supporting capacitor assembly is provided with positioning pin shafts, which can facilitate the installation and removal of the capacitor busbar 33.

[0082] The capacitor busbar 33 is connected to the power unit 31 busbar by bolts; in practical applications, the supporting capacitor assembly 32 and the power unit 31 can also be connected using electrical connectors (quick-connectors). Considering the cost of electrical connectors (quick-connectors) and the high parasitic inductance at the connection point, bolt connection of the busbars is preferred. By separating the supporting capacitor assembly 32 from the power unit 31, the volume and weight of the power unit can be greatly reduced, and the maintainability of the power unit 31 can be greatly improved; the number and position of the supporting capacitor assembly 32 can be adjusted according to design needs, and this utility model does not impose any limitations on this. It should be noted that, regarding the lateral arrangement, see [reference needed]. Figure 3C As shown, in the horizontal arrangement, the width side 31a of the power unit 31 is along the vertical direction, which can increase the number of converter components 3 stacked in the vertical direction and improve the integration.

[0083] Every three power units 31 constitute a UVW three-phase unit, that is, one power unit 31 is the U phase, one power unit 31 is the V phase, and one power unit 31 is the W phase, thereby realizing three-phase power output.

[0084] Specifically, in the embodiments of this utility model, see Figure 3A As shown, in a top-down direction, the three adjacent power units 31 on the upper side constitute a UVW three-phase unit, and the three adjacent power units 31 on the lower side constitute another UVW three-phase unit. This can effectively reduce wiring difficulty, reduce the probability of short circuits, and reduce safety risks.

[0085] In some embodiments of this utility model, optionally, see [reference needed]. Figure 2 and Figure 4 As shown, the first chamber 101 also has a current-sharing reactor 34;

[0086] The current sharing reactor 34 is located on the side wall of the other side of the left and right sides of the second sub-chamber, and there are multiple reactors that correspond one-to-one with the UVW three-phase units. The multiple current sharing reactors 34 are arranged at intervals in the vertical direction.

[0087] The current sharing reactor 34 is connected to the three power units of the corresponding UVW three-phase unit respectively, and the current sharing reactor 34 is also electrically connected to the output filter component 4.

[0088] It should be noted that the current sharing reactor 34 is connected to the three power units 31 of the corresponding UVW three-phase unit respectively. Specifically, the current sharing reactor 34 is electrically connected to the power unit 31 of the U phase in the corresponding UVW three-phase unit through a copper busbar, to the power unit 31 of the V phase through a copper busbar, and to the power unit 31 of the W phase through a copper busbar. This can effectively reduce wiring difficulty, reduce the probability of short circuits, and reduce safety risks.

[0089] In some alternative embodiments, the copper busbar can be arranged vertically. Vertical arrangement can improve the heat dissipation efficiency of the copper busbar, maintain the copper busbar in a good working environment, and improve the temperature rise and current carrying capacity characteristics of the copper busbar.

[0090] In some embodiments of this utility model, the output filter component 4 may optionally include a three-phase AC filter reactor.

[0091] Three-phase AC filter reactors limit short-circuit current by introducing inductive reactance, thereby protecting electrical equipment and preventing accidents such as equipment damage and fires caused by short circuits. By introducing inductive reactance, three-phase AC filter reactors can reduce voltage fluctuations and harmonics, thus improving power quality and ensuring the stability of the power system and the normal operation of electrical equipment. Three-phase AC filter reactors can also achieve reactive power compensation by introducing inductive reactance, further improving the stability and power quality of the power system.

[0092] The three-phase AC filter reactor is heavy. Placing the three-phase AC filter reactor in the second chamber 102 can lower the center of gravity of the converter cabinet and improve its stability.

[0093] In some embodiments of this utility model, optionally, see [reference needed]. Figure 2 , Figure 3A , Figure 3B As shown, the first chamber 101 includes a first sub-chamber and a second sub-chamber that are interconnected, with the first sub-chamber located in front of the second sub-chamber.

[0094] Converter component 3 includes:

[0095] Power unit 31, which is located in the first sub-chamber and has multiple units arranged in a vertical direction;

[0096] A flow guiding structure 6 is provided between the first air inlet 201 and each power unit 31. The flow guiding structure 6 is used to guide air from the first air inlet 201 to the corresponding power unit 31.

[0097] In some embodiments of this utility model, optionally, the heat dissipation air ducts of each power unit 31 (i.e., the unit air ducts formed by the flow guiding structures 6 corresponding to each power unit 31) are parallel air ducts, which are independent of each other and do not affect each other.

[0098] In this embodiment of the utility model, by providing a flow guide structure 6 between each first air inlet 201 and the corresponding power unit 31, independent air intake for each power unit 31 is achieved, ensuring the stability of the airflow direction and flow rate of each power unit 31 and improving heat dissipation efficiency.

[0099] Furthermore, it is understandable that when the first fan 1 is working, each stream of air entering the first chamber 101 through the guide structure 6 will converge into a stream of air in the first chamber 101 after passing through the power unit 31 corresponding to the guide structure 6. The converged stream of air will eventually be discharged from the first chamber 101 through the first air outlet 301.

[0100] In some embodiments of this utility model, optionally, see [reference needed]. Figure 5 and Figure 6 As shown, the capacitor busbar 33 has an airflow opening 33a that is directly opposite the position of the airflow guiding structure 6. The airflow opening 33a is used to allow the air flowing in through the airflow guiding structure 6 to flow through the power unit 31 and the supporting capacitor assembly 32, thereby achieving efficient heat dissipation.

[0101] In some optional embodiments, see Figure 3C As shown, the power unit 31 can be integrated with a flow guiding structure 6, which is used to guide air from the first air inlet 201 to the power unit 31 corresponding to the first air inlet 201, and remove the heat from the power unit 31.

[0102] In some optional embodiments, a metal heat sink fin (not shown in the figure) may be provided in the flow guiding structure 6. The metal heat sink fin (not shown in the figure) is connected to the electronic devices on the power unit 31 and is used to conduct the heat of the electronic devices on the power unit 31 to the flow guiding structure 6 to improve the heat dissipation efficiency.

[0103] In some embodiments of this utility model, optionally, see [reference needed]. Figure 1 , Figure 3A , Figure 3B , Figure 4 As shown, the converter cabinet of the bidirectional converter also includes:

[0104] The frame circuit breaker 5 is located in the second chamber 102;

[0105] The second fan 2 is also used to allow air to flow through the frame circuit breaker 5 and then be discharged from the second air outlet 302 shown.

[0106] The frame circuit breaker 5 is a mechanical switching device used to connect, carry, and disconnect current under normal circuit conditions. It can also connect, carry, and disconnect current for a certain time under specified abnormal circuit conditions. It can realize the function of distributing electrical energy and the function of protecting lines and power supply equipment from overload, undervoltage, and short circuit.

[0107] In this embodiment of the utility model, by setting a frame circuit breaker 5 in the second chamber 102 and using a second fan 2 to dissipate heat from the frame circuit breaker 5, the safe and stable operation of the frame circuit breaker 5 can be ensured.

[0108] In some embodiments of this utility model, optionally, the first fan 1 includes: a centrifugal fan; and / or,

[0109] The second fan 2 includes: an axial flow fan.

[0110] In this embodiment of the invention, the first fan 1 is a centrifugal fan, which generates air pressure to exhaust the high-temperature gas that has absorbed heat from the converter component 3 in the first chamber 101 to the outside of the first chamber 101, achieving high exhaust efficiency and high heat dissipation efficiency. Furthermore, utilizing the physical property of high-temperature gas flowing upwards, this embodiment of the invention places the centrifugal fan at the first air outlet 301 on the side wall of the top of the cabinet 100, further improving the exhaust efficiency of the high-temperature gas and achieving high heat dissipation efficiency.

[0111] In some embodiments of this utility model, optionally, see [reference needed]. Figure 7 As shown, both the first air inlet 201 and the second air inlet 202 have an air filtration structure 7.

[0112] In some alternative embodiments, the air filter structure 7 may be an air filter grille.

[0113] In some optional embodiments, the air filtration structure 7 can be an air filter with an embedded frame design. The filter screen can be installed without the use of screws, and the filter screen can be removed without the use of common tools (wrench, etc.) (the air filter can be removed by lifting and pulling it outward with the air filter handle). Furthermore, maintenance can be carried out without opening the cabinet door or interrupting the power supply, which greatly improves maintenance efficiency.

[0114] In some embodiments of this utility model, optionally, see [reference needed]. Figure 8 As shown, the second air outlet 302 has a protective structure 302a, which is in the shape of a "louver" with the opening facing downwards, meeting the IP31 protection requirements, and can reduce the harm to maintenance personnel caused by the high-temperature gas discharged from the second chamber 102.

[0115] In some embodiments of this utility model, optionally, a connecting copper busbar (not shown in the figure) is also arranged in the first chamber 101. The connecting copper busbar is mostly arranged vertically, for example, the AC output connecting copper busbar (UVW phase) of the power unit 31. The vertical arrangement can facilitate the heat dissipation of the copper busbar, so that the copper busbar works in a better environment, which plays an important role in its temperature rise and current carrying capacity.

[0116] In some embodiments of this utility model, optionally, the capacitor busbar 33 is arranged vertically, that is, the copper busbar is arranged vertically. The air entering the air chamber and being sucked into the top will flow through the vertically arranged capacitor busbar 33, carrying away the heat of the capacitor busbar 33.

[0117] In some embodiments of this utility model, optionally, the current sharing reactor 34 is arranged vertically, and the air drawn into the top of the first chamber 101 flows through the current sharing reactor 34, carrying away the heat from the current sharing reactor 34. This utility model also provides a bidirectional converter, including the converter cabinet of the bidirectional converter as described in any of the embodiments of this utility model.

[0118] In some embodiments of this utility model, optionally, see [reference needed]. Figure 7 As shown, the bidirectional converter also includes: a switch control cabinet 8, of which there are at least two, and the switch control cabinet 8 and the at least two converter cabinets are arranged side by side.

[0119] In this embodiment of the utility model, at least two converter cabinets are used to achieve a redundant design for power supply, which can avoid power supply interruption caused by the failure of a single converter cabinet.

[0120] In some optional embodiments, the bidirectional converter can have two converter cabinets. While meeting heat dissipation and maintenance requirements, it can integrate current-sharing reactors and three-phase AC filter reactors within a relatively small volume, enabling cabinet designs of 1800 (width) × 1200 (thickness) × 2400 (height) mm for 6MW and 9MW models, achieving efficient use of space. In some embodiments of this invention, the switch control cabinet 8 can optionally be a DC switch cabinet, arranged adjacent to the converter cabinet. The front door of the DC switch cabinet is equipped with indicator lights, buttons, an HMI touchscreen, etc. The DC switch cabinet houses the controller, DC switches, power supply box, terminal blocks, etc. This invention does not limit whether the DC switch cabinet is located on the left or right side of the converter cabinet.

[0121] In some embodiments of this utility model, optionally, the front door of the converter cabinet is designed as a double door. After being opened by a linkage lock, the power unit 31 can be maintained with maximum space. An air filter (including an air filter for the power unit 31 air inlet (i.e., the first air inlet 201) and an air filter for the filter reactor air inlet (i.e., the second air inlet 202)) is designed on the front door of the converter cabinet. The air filter adopts an embedded frame design, which allows the filter screen to be installed without the use of screws. Furthermore, the filter screen can be removed without the use of ordinary tools (wrench, etc.) (the air filter can be removed by lifting and pulling outward with the air filter handle). It also allows for maintenance without opening the cabinet door and without interrupting power, greatly improving maintenance efficiency.

[0122] In some optional embodiments, see Figure 7 and Figure 8 As shown, the converter cabinet and switch control cabinet 8 are fastened to the channel steel base 9 by bolts, and the channel steel base 9 bears the overall force.

[0123] In some alternative embodiments, the channel steel base 9 can be connected to the foundation using fasteners (e.g., bolts) so that the bidirectional converter can be stably mounted on the foundation and prevent the bidirectional converter from tipping over.

[0124] It should be noted that, in this document, 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 that element.

[0125] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A converter cabinet for a bidirectional converter, characterized in that, include: Cabinet, first fan, second fan; The cabinet has a first chamber for housing the converter assembly and a second chamber for housing the output filter assembly, with the first chamber located above the second chamber; On one side wall of the front and rear sides of the cabinet, the cabinet has a first air inlet communicating with the first chamber and a second air inlet communicating with the second chamber; On the top side wall of the cabinet, the cabinet has a first air outlet communicating with the first chamber; on the other side wall of the front and rear sides of the cabinet, the cabinet also has a second air outlet communicating with the second chamber and being positioned opposite the second air inlet. The first fan is located at the first air outlet and is used to allow air to enter the first chamber through the first air inlet, flow through the converter assembly, and then be discharged from the first air outlet. The second fan is located in the second chamber and is used to allow air to enter the second chamber through the second air inlet, flow through the output filter assembly, and then be discharged through the second air outlet.

2. The converter cabinet of the bidirectional converter according to claim 1, characterized in that, The first chamber includes a first sub-chamber and a second sub-chamber that are interconnected, with the first sub-chamber located in front of the second sub-chamber. The converter component includes: a power unit, a supporting capacitor assembly, and a capacitor busbar; The power unit is located in the first sub-chamber and has multiple units arranged in a vertical direction; The supporting capacitor assembly is disposed on one side wall of the left or right side of the second sub-chamber. Each power unit is provided with a corresponding supporting capacitor assembly. The power unit is electrically connected to the supporting capacitor assembly through the capacitor busbar.

3. The converter cabinet of the bidirectional converter according to claim 2, characterized in that, Each of the power units is arranged laterally, and every three power units constitute a UVW three-phase unit. The three power units of the same UVW three-phase unit are electrically connected to their respective supporting capacitor components through a capacitor busbar.

4. The converter cabinet of the bidirectional converter according to claim 3, characterized in that, The first chamber also has a current-sharing reactor; The current sharing reactor is located on the side wall of the other side of the left and right sides of the second sub-chamber, and there are multiple reactors that correspond one-to-one with the UVW three-phase units. The multiple current sharing reactors are arranged at intervals in the vertical direction. The current sharing reactor is connected to the three power units of the corresponding UVW three-phase unit, and the current sharing reactor is also electrically connected to the output filter component.

5. The converter cabinet of the bidirectional converter according to claim 1 or 4, characterized in that, The output filtering component includes a three-phase AC filter reactor.

6. The converter cabinet of the bidirectional converter according to claim 1, characterized in that, The first chamber includes a first sub-chamber and a second sub-chamber that are interconnected, with the first sub-chamber located in front of the second sub-chamber. The converter component includes: A power unit, wherein the power unit is disposed in the first sub-chamber and has a plurality of units arranged in a vertical direction; A flow guiding structure is provided between the first air inlet and each of the power units, and the flow guiding structure is used to guide air from the first air inlet to the corresponding power unit.

7. The converter cabinet of the bidirectional converter according to claim 1, characterized in that, Also includes: A frame circuit breaker is located in the second chamber; The second fan is also used to allow air to flow through the frame circuit breaker and then be discharged through the second air outlet shown.

8. The converter cabinet of the bidirectional converter according to claim 1, characterized in that, The first fan includes: a centrifugal fan; and / or, The second fan includes: an axial flow fan.

9. The converter cabinet of the bidirectional converter according to claim 1, characterized in that, Both the first air inlet and the second air inlet have air filtration structures.

10. A bidirectional converter, characterized in that, A converter cabinet including the bidirectional converter as described in any one of claims 1 to 9.

11. The bidirectional converter according to claim 10, characterized in that, Also includes: A switch control cabinet, wherein there are at least two converter cabinets, and the switch control cabinet and the at least two converter cabinets are arranged side by side.

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