Power cabinet

Abstract

The utility model belongs to the technical field of semiconductor switches, and particularly discloses a power cabinet. According to the power cabinet provided by the utility model, two sides of an energy consumption device cabinet are provided with three rectification power cabinets and three inversion power cabinets, the energy consumption device cabinet comprises a second cabinet body, an energy consumption resistor and a commutation switch device are arranged in the second cabinet body, and the rectification power cabinets and the inversion power cabinets have the same structure. Each functional cabinet comprises a first cabinet body, a converter valve module and a capacitor module, the converter valve module and the capacitor module are arranged in the first cabinet body, each functional cabinet is an independent module, modular design of the power cabinet is achieved, installation is convenient, the positions, the number and the like of energy consumption device cabinets, rectification power cabinets or inversion power cabinets can be adjusted according to actual requirements, and use flexibility is high; besides, the capacitor module and the converter valve module are integrated in one cabinet body, so that the rectification power cabinet or the inversion power cabinet becomes an independent device, the integration level of the power cabinet is improved, the structure is compact, the number of electrical cabinets is reduced, and maintenance is convenient.

Description

Technical Field

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

[0002] IGCT can replace conventional thyristor power electronic switching devices and be used in high-power semiconductor switches. IGCT devices have the characteristics of high voltage resistance, low loss, high current, and high safety.

[0003] However, power cabinets based on IGCT three-level back-to-back topology circuits have more electronic components than those based on IGBT three-level back-to-back topology circuits. This results in some existing layouts being more complex, with electronic components being scattered and not compact enough, having low integration, being inconvenient to install, and being troublesome to maintain. Furthermore, they cannot be flexibly configured according to different application requirements. Utility Model Content

[0004] The purpose of this utility model is to provide a power cabinet with high integration, compact structure, modular design, easy installation and maintenance, and can be configured and installed according to different needs, thus improving the flexibility of practical applications.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A power cabinet, comprising:

[0007] The rectifier unit includes three rectifier power cabinets, which are arranged sequentially along a first direction;

[0008] The inverter unit includes three inverter power cabinets, which are arranged sequentially along a first direction;

[0009] An energy-consuming device cabinet is disposed between the rectifier unit and the inverter unit;

[0010] Each of the rectifier power cabinets and each of the inverter power cabinets includes a first cabinet, a converter valve module disposed in the first cabinet, and a capacitor module disposed in the first cabinet, wherein the capacitor module is electrically connected to the converter valve module.

[0011] The energy-consuming device cabinet includes a second cabinet, an energy-consuming resistor disposed in the second cabinet, and a converter switch device disposed in the second cabinet. The converter switch device is electrically connected to the energy-consuming resistor.

[0012] As an optional technical solution for the aforementioned power cabinet, the commutation switch device is positioned below the energy-consuming resistor along the height direction of the second cabinet.

[0013] As an optional technical solution for the aforementioned power cabinet, the capacitor module is positioned below the converter valve module along the height direction of the first cabinet.

[0014] As an optional technical solution for the aforementioned power cabinet, the rectifier power cabinet, the inverter power cabinet, and the energy-consuming device cabinet are all provided with AC input terminals and AC output terminals on their tops, and DC input terminals and DC output terminals are all provided on their bottoms.

[0015] As an optional technical solution for the aforementioned power cabinet, the energy-consuming device cabinet further includes an air-cooled heat dissipation component and a liquid-cooled heat dissipation component. The air-cooled heat dissipation component is connected to the energy-consuming resistor and is used to dissipate heat from the energy-consuming resistor. The liquid-cooled heat dissipation component is connected to the commutator switching device and is used to dissipate heat from the commutator switching device.

[0016] As an optional technical solution for the aforementioned power cabinet, the converter valve module includes a mounting base and at least one converter valve string, the converter valve string being detachably mounted on the mounting base, and the mounting base being detachably mounted inside the first cabinet.

[0017] As an optional technical solution for the aforementioned power cabinet, the converter valve string includes at least one of IGCT devices and diode devices.

[0018] As an optional technical solution for the aforementioned power cabinets, each of the rectifier power cabinets and each of the inverter power cabinets further includes a cooling module, which is connected to the converter valve string and configured to cool the converter valve string.

[0019] As an optional technical solution for the aforementioned power cabinet, the cooling module includes an inlet pipe, an outlet pipe, a first distribution pipe, a second distribution pipe, multiple connecting pipes, and multiple sets of liquid-cooled heat sinks. Each set of liquid-cooled heat sinks includes multiple liquid-cooled heat sinks. The liquid-cooled heat sinks are connected in series with the converter valve. The first distribution pipe is connected to the inlet pipe. In each set of liquid-cooled heat sinks, the inlet of the first liquid-cooled heat sink is connected to the first distribution pipe. Two adjacent liquid-cooled heat sinks are connected through the connecting pipes. The outlet of the last liquid-cooled heat sink is connected to the second distribution pipe, and the second distribution pipe is connected to the outlet pipe.

[0020] As an optional technical solution for the aforementioned power cabinet, the mounting base includes two spaced-apart I-beams. The I-beams are detachably connected to the first cabinet body. Multiple support plates are connected between the two I-beams. The converter valve is installed on the support plates. The liquid inlet pipe is located in the inner groove of one of the I-beams, and the liquid outlet pipe is located in the inner groove of the other I-beam.

[0021] The beneficial effects of this utility model are:

[0022] The power cabinet provided by this utility model has three rectifier power cabinets and three inverter power cabinets on both sides of the energy consumption device cabinet. The energy consumption device cabinet includes a second cabinet body, in which energy-consuming resistors and commutation switching devices are installed. The rectifier power cabinets and inverter power cabinets have the same structure, both including a first cabinet body and a commutation valve module and a capacitor module installed in the first cabinet body. Each functional cabinet is an independent module, realizing the modular design of the power cabinet, which is convenient for installation. The position and number of energy consumption device cabinets, rectifier power cabinets or inverter power cabinets can be adjusted according to actual needs, which is highly flexible in use. In addition, the capacitor module and the commutation valve module are integrated into one cabinet body, making the rectifier power cabinet or inverter power cabinet an independent device, which improves the integration of the power cabinet, makes the structure compact, reduces the number of electrical cabinets, and facilitates installation and maintenance. Attached Figure Description

[0023] Figure 1 This is a front view of the power cabinet provided in an embodiment of this utility model;

[0024] Figure 2 This is an isometric view of the power cabinet provided in this embodiment of the utility model;

[0025] Figure 3 This is a first axonometric view of the rectifier power cabinet or inverter power cabinet provided in this embodiment of the utility model;

[0026] Figure 4 This is a second axonometric view of the rectifier power cabinet or inverter power cabinet provided in this embodiment of the utility model;

[0027] Figure 5 This is an isometric view of the converter valve module and cooling module provided in this embodiment of the utility model;

[0028] Figure 6 This is a top view of the converter valve module and cooling module provided in this embodiment of the utility model;

[0029] Figure 7 This is a schematic diagram of the structure of the IGCT type converter valve string provided in this embodiment of the utility model;

[0030] Figure 8This is a schematic diagram of the structure of a diode-type converter valve string provided in an embodiment of this utility model;

[0031] Figure 9 This is a structural schematic diagram of the energy-consuming device cabinet provided in this embodiment of the utility model.

[0032] In the picture:

[0033] 100. Rectifier unit; 101. Rectifier power cabinet; 200. Inverter unit; 201. Inverter power cabinet; 300. Energy dissipation device cabinet;

[0034] 11. First cabinet; 12. Converter valve module; 121. Mounting base; 1211. I-beam; 1212. Support plate; 122. Converter valve string; 1221. IGCT device; 1222. Diode device; 13. Capacitor module; 14. Cooling module; 141. Inlet pipe; 142. Outlet pipe; 143. First distributor pipe; 144. Second distributor pipe; 145. Connecting pipe; 146. Liquid-cooled radiator; 15. Busbar; 16. First support base; 161. First longitudinal beam; 162. First crossbeam; 17. Second support base; 171. Second longitudinal beam; 172. Second crossbeam; 31. Second cabinet; 32. Energy-consuming resistor; 33. Converter switch device. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between 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.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] like Figure 1 and Figure 2 As shown, this embodiment provides a power cabinet, which includes a rectifier unit 100, an inverter unit 200, and an energy-consuming device cabinet 300. The rectifier unit 100 includes three rectifier power cabinets 101, which are arranged sequentially along a first direction. The inverter unit 200 includes three inverter power cabinets 201, which are arranged sequentially along the first direction. The energy-consuming device cabinet 300 is disposed between the rectifier unit 100 and the inverter unit 200. Each rectifier power cabinet 101 and each inverter power cabinet 201 includes a first cabinet body 11, a converter valve module 12 disposed within the first cabinet body 11, and a capacitor module 13 disposed within the first cabinet body 11. The capacitor module 13 is electrically connected to the converter valve module 12. The energy-consuming device cabinet 300 includes a second cabinet 31, an energy-consuming resistor 32 disposed in the second cabinet 31, and a converter switch device 33 disposed in the second cabinet 31. The converter switch device 33 is electrically connected to the energy-consuming resistor 32.

[0040] The energy-consuming device cabinet 300 has three rectifier power cabinets 101 and three inverter power cabinets 201 on both sides. The energy-consuming device cabinet 300 includes a second cabinet 31, which houses an energy-consuming resistor 32 and a converter switch device 33. The rectifier power cabinets 101 and inverter power cabinets 201 have the same structure, each including a first cabinet 11 and a converter valve module 12 and a capacitor module 13 installed in the first cabinet 11. Each functional cabinet is an independent module, realizing the modular design of the power cabinet, which is convenient for installation. The position and number of the energy-consuming device cabinet 300, rectifier power cabinet 101 or inverter power cabinet 201 can be adjusted according to actual needs, which is highly flexible. In addition, the capacitor module 13 and the converter valve module 12 are integrated into one cabinet, making the rectifier power cabinet 101 or inverter power cabinet 201 an independent device, which improves the integration of the power cabinet, makes the structure compact, reduces the number of electrical cabinets, and facilitates installation and maintenance.

[0041] The rectifier power cabinet 101 and the inverter power cabinet 201 have the same structure. During the operation of the power cabinet, the rectifier power cabinet 101 is used for current rectification, and the inverter power cabinet 201 is used for current inversion.

[0042] In some embodiments, AC input and output terminals are provided on the top of the rectifier power cabinet 101, inverter power cabinet 201, and energy-consuming device cabinet 300, and DC input and output terminals are provided on the bottom of the rectifier power cabinet 101, inverter power cabinet 201, and energy-consuming device cabinet 300. The DC input / output terminals and AC input / output terminals of cabinets with different functions are located in the same position, which facilitates wiring when cabinets with different functions are used in combination, improving the ease of assembly.

[0043] like Figures 3 to 5 As shown, in some embodiments, along the height direction of the first cabinet 11, the capacitor module 13 is disposed below the converter valve module 12. The converter valve module 12 and the capacitor module 13 are disposed vertically, which reduces the engineering footprint of the rectifier power cabinet 101 or the inverter power cabinet 201.

[0044] The converter valve module 12 includes a mounting base 121 and at least one converter valve string 122. The converter valve string 122 is detachably mounted on the mounting base 121, which is detachably mounted inside the first cabinet 11. The mounting base 121 of the converter valve module 12 is detachably connected to the first cabinet 11, and the converter valve string 122 is detachably mounted on the mounting base 121. The converter valve module 12 is integrated, and in the event of a failure, the converter valve module 12 can be replaced or repaired independently without affecting other components within the power module device, facilitating disassembly and maintenance.

[0045] The converter valve module 12 is electrically connected to the capacitor module 13 via busbar 15. Optionally, busbar 15 is a multilayer busbar. The specific connection circuit between the converter valve module 12 and the capacitor module 13 is not specifically limited here.

[0046] Optionally, the commutation valve string 122 includes at least one of an IGCT device 1221 and a diode device 1222. Specifically, the commutation valve string 122 includes an IGCT device 1221, or the commutation valve string 122 includes a diode device 1222, or the commutation valve string 122 includes both an IGCT device 1221 and a diode device 1222. This can be configured according to actual needs and is not specifically limited here. The IGCT device is an integrated gate commutated thyristor.

[0047] The first cabinet 11 is equipped with multiple converter valve modules 12. Some of the converter valve modules 12 include IGCT type converter valve strings 122, and other converter valve modules 12 include diode type converter valve strings 122. Alternatively, each converter valve string 122 of each converter valve module 12 may include both IGCT device 1221 and diode device 1222. No specific limitation is made here.

[0048] The IGCT device 1221 is suitable for high-power power cabinets, while for low-power power cabinets, IGBT devices can be used instead of the IGCT device 1221.

[0049] The specific structure of the converter valve series 122 is existing technology and will not be described in detail here.

[0050] In some embodiments, such as Figure 5 and Figure 6 As shown, each rectifier power cabinet 101 and each inverter power cabinet 201 also includes a cooling module 14. The cooling module 14 is connected to the converter valve string 122. The cooling module 14 is configured to cool the converter valve string 122 to reduce the heat generated during operation of the converter valve string 122 and extend the service life of the converter valve string 122.

[0051] Each converter valve module 12 is provided with a corresponding cooling module 14, which facilitates the replacement of individual converter valve modules 12. Alternatively, multiple converter valve modules 12 can be provided, with multiple converter valve modules 12 corresponding to one cooling module 14, which improves the integration of the structure and reduces the number of components.

[0052] Optionally, the cooling module 14 includes an inlet pipe 141, an outlet pipe 142, a first distribution pipe 143, a second distribution pipe 144, multiple connecting pipes 145, and multiple sets of liquid-cooled radiators 146. Each set of liquid-cooled radiators 146 includes multiple liquid-cooled radiators 146. The liquid-cooled radiators 146 are connected to the converter valve series 122. The first distribution pipe 143 is connected to the inlet pipe 141. In each set of liquid-cooled radiators 146, the inlet of the first liquid-cooled radiator 146 is connected to the first distribution pipe 143. Two adjacent liquid-cooled radiators 146 are connected through the connecting pipe 145. The outlet of the last liquid-cooled radiator 146 is connected to the second distribution pipe 144. The second distribution pipe 144 is connected to the outlet pipe 142. The coolant flows into the first distribution pipe 143 through the inlet pipe 141, and then flows through the first distribution pipe 143 to multiple sets of liquid-cooled radiators 146. The coolant first enters the first liquid-cooled radiator 146 in each set of liquid-cooled radiators 146, and then flows through each liquid-cooled radiator 146 in sequence through the connecting pipe 145. Then the coolant is discharged from the last liquid-cooled radiator 146 into the second distribution pipe 144, and then discharged through the outlet pipe 142, thereby realizing the circulation of coolant and cooling the converter valve string 122 during the circulation process.

[0053] like Figure 7 and Figure 8 As shown, the converter valve string 122 includes an IGCT device 1221 or a diode device 1222, and a liquid-cooled heat sink 146 is disposed between two adjacent IGCT devices 1221 or between adjacent diode devices 1222. The specific connection structure between the liquid-cooled heat sink 146 and the converter valve string 122 is prior art and is not specifically limited here.

[0054] Continue to refer to Figure 5 and Figure 6 As shown, for example, each converter valve module 12 is respectively provided with a cooling module 14. If multiple converter valve modules 12 are provided, the multiple cooling modules 14 corresponding to them are independent and not connected to each other. If multiple converter valve modules 12 are provided with one cooling module 14, then the cooling module 14 may include multiple first liquid distribution pipes 143 and / or multiple second liquid distribution pipes 144, depending on the specific situation, which will not be described in detail here.

[0055] Optionally, the mounting base 121 includes two spaced-apart I-beams 1211. The I-beams 1211 are detachably connected to the first cabinet 11. Multiple support plates 1212 connect the two I-beams 1211. A converter valve string 122 is mounted on the support plate 1212. An inlet pipe 141 is located in the inner groove of one of the I-beams 1211, and an outlet pipe 142 is located in the inner groove of the other I-beam 1211. The structure of the I-beams 1211 can accommodate the inlet pipe 141 and the outlet pipe 142, improving the compactness of the connection between the converter valve module 12 and the cooling module 14. Furthermore, it ensures that the inlet pipe 141 and the outlet pipe 142 are not damaged during the installation or removal of the converter valve module 12.

[0056] The cooling medium of the cooling module 14 is preferably liquid water, which has low cooling cost.

[0057] In some embodiments, see Figure 3 and Figure 4 As shown, a first support base 16 is provided at the bottom of the first cabinet 11, and a second support base 17 is provided above the first support base 16 at a distance. The second support base 17 is connected to the mounting base 121. The capacitor module 13 is placed between the first support base 16 and the second support base 17, and the capacitor module 13 is connected to the first support base 16. The first support base 16 provides support for the installation of the capacitor module 13, facilitating its installation within the first cabinet 11. The second support base 17 provides support for the installation of the mounting base 121, facilitating the installation of the converter valve module 12 within the first cabinet 11. The arrangement of the first support base 16 and the second support base 17 facilitates the installation of each module, realizing modular installation of each module and improving the integration of the power module device.

[0058] Optionally, the first support base 16 includes two first longitudinal beams 161 and multiple first transverse beams 162. The two first longitudinal beams 161 are connected to the two side walls of the first cabinet 11, and the multiple first transverse beams 162 are spaced apart, with both ends of the first transverse beams 162 connected to the two first longitudinal beams 161. The capacitor module 13 is mounted on the multiple first transverse beams 162. The first support base 16 has a simple structure, using the first longitudinal beams 161 and the first transverse beams 162 to build a structure supporting the capacitor module 13, and can accommodate multiple capacitor modules 13, reducing the weight of the power module device. In addition, the gaps between the first transverse beams 162 and the first longitudinal beams 161 are beneficial for heat dissipation of the capacitor module 13.

[0059] The first cabinet 11 includes a frame and a panel covering the periphery of the frame. The first longitudinal beam 161 is bolted to the frame, and the first transverse beam 162 is bolted to the first longitudinal beam 161.

[0060] The second support base 17 includes two second longitudinal beams 171 and multiple second transverse beams 172. The two second longitudinal beams 171 are connected to the side walls of the first cabinet 11. The multiple second transverse beams 172 are spaced apart, and both ends of the second transverse beams 172 are connected to the two second longitudinal beams 171. The mounting base 121 rests on the multiple second transverse beams 172. The second support base 17 has a simple structure, using the second longitudinal beams 171 and the second transverse beams 172 to support the mounting base 121, and can accommodate multiple converter valve modules 12, reducing the weight of the power module device. In addition, the gaps between the second transverse beams 172 and the second longitudinal beams 171 facilitate heat dissipation of the converter valve modules 12. Optionally, the second longitudinal beams 171 are bolted to the frame of the first cabinet 11, and the second transverse beams 172 are bolted to the second longitudinal beams 171.

[0061] like Figure 9 As shown, in some embodiments, the commutation switch 33 is positioned below the energy-consuming resistor 32 along the height direction of the second cabinet 31. The vertical arrangement of the commutation switch 33 and the energy-consuming resistor 32 reduces the footprint of the energy-consuming device cabinet 300.

[0062] The energy-consuming device cabinet 300 also includes an air-cooled heat dissipation assembly and a liquid-cooled heat dissipation assembly (not shown in the figure). The air-cooled heat dissipation assembly is connected to the energy-consuming resistor 32 and is used to dissipate heat from the energy-consuming resistor 32 to reduce the heat generated during operation and extend its service life. The liquid-cooled heat dissipation assembly is connected to the commutation switching device 33 and is used to dissipate heat from the commutation switching device 33 to reduce the heat generated during operation and extend its service life.

[0063] Optionally, the air-cooled heat dissipation component includes an intake fan and an exhaust fan. The second cabinet 31 is provided with an air inlet and an air outlet. The intake fan is located at the air inlet, and the exhaust fan is located at the air outlet. The intake fan is connected to a cooler, and a cooling channel is formed between the intake fan and the exhaust fan. The energy-consuming resistor 32 is located in the cooling channel. The intake fan blows air into the cooling channel and cools it through the cooler. The exhaust fan draws out the hot air from the cooling channel, thereby achieving heat dissipation for the energy-consuming resistor 32.

[0064] The structure of the liquid cooling heat dissipation component is the same as that of the cooling module 14 described above, and will not be described in detail here. The structures of the commutation switch device 33 and the energy-consuming resistor 32 are existing technologies, and the specific connection relationship between the commutation switch device 33 and the energy-consuming resistor 32 is not specifically limited.

[0065] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A power cabinet, characterized in that, include: The rectifier unit (100) includes three rectifier power cabinets (101), which are arranged sequentially along a first direction; The inverter unit (200) includes three inverter power cabinets (201), which are arranged sequentially along a first direction; An energy-consuming device cabinet (300) is disposed between the rectifier unit (100) and the inverter unit (200); Each of the rectifier power cabinets (101) and each of the inverter power cabinets (201) includes a first cabinet (11), a converter valve module (12) disposed in the first cabinet (11), and a capacitor module (13) disposed in the first cabinet (11). The capacitor module (13) is electrically connected to the converter valve module (12). The energy-consuming device cabinet (300) includes a second cabinet (31), an energy-consuming resistor (32) disposed in the second cabinet (31), and a converter switch device (33) disposed in the second cabinet (31). The converter switch device (33) is electrically connected to the energy-consuming resistor (32).

2. The power cabinet according to claim 1, characterized in that, Along the height direction of the second cabinet (31), the commutation switch device (33) is disposed below the energy-consuming resistor (32).

3. The power cabinet according to claim 1, characterized in that, Along the height direction of the first cabinet (11), the capacitor module (13) is located below the converter valve module (12).

4. The power cabinet according to claim 1, characterized in that, The rectifier power cabinet (101), the inverter power cabinet (201), and the energy-consuming device cabinet (300) are all provided with AC input terminals and AC output terminals on their tops, and DC input terminals and DC output terminals are all provided on their bottoms.

5. The power cabinet according to claim 1, characterized in that, The energy-consuming device cabinet (300) also includes an air-cooled heat dissipation component and a liquid-cooled heat dissipation component. The air-cooled heat dissipation component is connected to the energy-consuming resistor (32) and is used to dissipate heat from the energy-consuming resistor (32). The liquid-cooled heat dissipation component is connected to the commutator switch (33) and is used to dissipate heat from the commutator switch (33).

6. The power cabinet according to claim 1, characterized in that, The converter valve module (12) includes a mounting base (121) and at least one converter valve string (122). The converter valve string (122) is detachably mounted on the mounting base (121), and the mounting base (121) is detachably mounted inside the first cabinet (11).

7. The power cabinet according to claim 6, characterized in that, The converter valve string (122) includes at least one of an IGCT device (1221) and a diode device (1222).

8. The power cabinet according to claim 6, characterized in that, Each of the rectifier power cabinets (101) and each of the inverter power cabinets (201) further includes a cooling module (14) connected to the converter valve string (122) and configured to cool the converter valve string (122).

9. The power cabinet according to claim 8, characterized in that, The cooling module (14) includes an inlet pipe (141), an outlet pipe (142), a first distribution pipe (143), a second distribution pipe (144), multiple connecting pipes (145), and multiple sets of liquid-cooled radiators (146). Each set of liquid-cooled radiators (146) includes multiple liquid-cooled radiators (146). The liquid-cooled radiators (146) are connected to the converter valve string (122). The first distribution pipe (143) is connected to the inlet pipe (141). In each set of liquid-cooled radiators (146), the inlet of the first liquid-cooled radiator (146) is connected to the first distribution pipe (143). Two adjacent liquid-cooled radiators (146) are connected through the connecting pipes (145). The outlet of the last liquid-cooled radiator (146) is connected to the second distribution pipe (144). The second distribution pipe (144) is connected to the outlet pipe (142).

10. The power cabinet according to claim 9, characterized in that, The structure of the mounting base (121) includes two spaced-apart I-beams (1211), which are detachably connected to the first cabinet (11). Multiple support plates (1212) are connected between the two I-beams (1211). The converter valve string (122) is installed on the support plate (1212). The liquid inlet pipe (141) is located in the inner groove of one of the I-beams (1211), and the liquid outlet pipe (142) is located in the inner groove of the other I-beam (1211).

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