A power module structure of a combined assembly type direct current converter valve

Abstract

This invention relates to the field of flexible DC transmission converter valve technology, specifically a power module structure for a combined assembled DC converter valve. The structure includes a valve string unit and a DC capacitor unit. The valve string unit further includes a unit base, and the DC capacitor unit includes a capacitor. A frame unit is fixedly mounted in the middle of the upper surface of the unit base. A valve string pressing assembly is disposed inside the frame unit. A support rail is fixedly mounted at the front end of the inner top surface of the valve string unit. A secondary circuit board control unit is inserted and mounted on the upper surface of the support rail. A drive board unit is fixedly mounted in the middle of the front end of the inner surface of the valve string unit. A bypass switch unit is inserted and fixedly mounted through the lower front end of the outer surface of the valve string unit. This invention successfully achieves weight reduction and miniaturization of the power module, significantly improving its adaptability and economy for deployment on offshore platforms, while effectively enhancing the maintainability and operational reliability of the equipment in harsh marine environments.

Description

Technical Field

[0001] This invention relates to the field of flexible DC transmission converter valve technology, and more specifically, to a power module structure for a combined assembled DC converter valve. Background Technology

[0002] With the development of offshore wind power, traditional AC power transmission faces fundamental challenges in long-distance transmission across the sea. When the power transmission distance exceeds the threshold of 100 kilometers, the system efficiency will plummet. Its inherent technical bottlenecks are mainly manifested in core problems such as significantly increased transmission loss, continuous weakening of grid stability, and capacitive current limitations of submarine cables.

[0003] Faced with the massive installed capacity targets in offshore wind power planning, the complex and harsh marine operating environment has placed unprecedented reliability requirements on key equipment. Among them, flexible DC transmission technology, with its unique current control capability, excellent energy transmission efficiency, and system characteristics that do not require additional reactive power compensation, has become the preferred solution for global offshore clean energy grid connection.

[0004] Flexible DC transmission technology still consists of converter stations and DC transmission lines. However, when converter stations are applied to offshore platforms, conventional land-based converter equipment cannot meet the special working conditions of offshore platforms in terms of spatial layout, structural load-bearing capacity and environmental adaptability due to the limited space and difficult operation and maintenance of offshore platforms.

[0005] Based on this, a power module structure for a combined assembled DC converter valve is proposed. Summary of the Invention

[0006] The main objective of this invention is to provide a power module structure for a combined assembled DC converter valve to overcome the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides a power module structure for a combined assembled DC converter valve, including a valve string unit and a DC capacitor unit. The valve string unit further includes a unit base, and the DC capacitor unit further includes a capacitor. A frame unit is fixedly installed in the middle of the upper surface of the unit base. A valve string pressing assembly is disposed inside the frame unit. A support rail is fixedly installed at the front end of the inner top surface of the valve string unit. A secondary circuit board control unit is inserted and installed on the upper surface of the support rail. A drive board unit is fixedly installed in the middle of the front end of the inner surface of the valve string unit. A bypass switch unit is inserted and fixedly installed through the lower front end of the outer surface of the valve string unit.

[0008] As a further improvement of the present invention, an upper frame mounting plate is fixedly installed at the rear end of the upper surface of the valve string unit, an upper frame connecting plate is fixedly installed at the front end of the upper surface of the capacitor, the rear end of the upper frame mounting plate is inserted into the upper frame connecting plate for fixed installation and connection, base positioning plates are fixedly installed on both sides of the rear end of the upper surface of the unit base, a capacitor base is fixedly installed at the front end of the lower surface of the capacitor, and the rear lower surface of the base positioning plate is fixedly installed and connected to the front upper surface of the capacitor base.

[0009] As a further improvement of the present invention, the capacitor is fixedly mounted with a positive capacitor busbar through a terminal at the middle of the front end of the outer surface, and a negative capacitor busbar is fixedly mounted at the front end of the positive capacitor busbar. The positive capacitor busbar and the negative capacitor busbar are fixedly connected to a DC busbar together with the valve string crimping assembly.

[0010] As a further improvement of the present invention, the frame unit includes two sets of valve string side plates. Insulating side plates are fixedly installed on the middle part of the outer surface of the two sets of valve string side plates that are close to each other. A valve string top plate is fixedly installed on the upper part of the outer surface of the two sets of valve string side plates that are close to each other. A valve string bottom plate is fixedly installed on the lower part of the outer surface of the two sets of valve string side plates that are close to each other. A guide sleeve is inserted and fixedly installed through the middle of the upper surface of the valve string top plate. A disc spring is movably sleeved on the outer surface of the guide sleeve. A top bolt is spirally inserted and fixedly installed in the middle of the upper surface of the guide sleeve.

[0011] As a further improvement of the present invention, the valve string crimping assembly includes four sets of water-cooled heat sinks, which are stacked and spaced apart. A guide pipe is connected between the water-cooled heat sinks. The other end of the guide pipe connected to one set of water-cooled heat sinks extends outward through the valve string unit. A crimped IGBT is crimped and fixedly installed on the outer surface of the three upper sets of water-cooled heat sinks that are close to each other. A crimped diode is crimped and fixedly installed on the upper surface of the lower set of water-cooled heat sinks. A transition pad is provided above the crimped diode. The upper surface of the transition pad is fixedly connected to the water-cooled heat sink. The valve string crimping assembly is fixedly installed in the middle of the upper surface of the valve string base plate. The upper surface of the valve string crimping assembly abuts against the lower surface of the disc spring.

[0012] As a further improvement of the present invention, the secondary circuit board control unit includes a board box, a power supply board is fixedly installed on the lower part of the inner surface of the board box, a bypass board is fixedly installed on the upper part of the inner surface of the board box, a control board is fixedly installed in the middle part of the inner surface of the board box, and tapered power guide pins are fixedly installed on both sides of the lower part of the rear end of the outer surface of the board box. Power guide sleeves are fixedly installed on both sides of the rear end of the upper surface of the support rail. The power guide pins are correspondingly inserted into the power guide sleeves. An opening matching the board box is opened on the upper front end of the outer surface of the valve string unit. A protective panel is fixedly installed on the inner surface of the valve string unit through the opening.

[0013] The beneficial effects of this invention are: To meet the application requirements of compact space, limited load-bearing capacity, and harsh environments on offshore platforms, this invention adheres to the principles of lightweighting and compactness in the power module design. One of the core strategies is to use aluminum alloy as the key structural material. Compared with traditional steel, aluminum alloy has significant quality advantages (low density). While ensuring structural strength, it can effectively reduce the overall weight of the module. At the same time, its excellent thermal conductivity helps to dissipate heat from power devices, and it also takes into account good processability and corrosion resistance potential (with appropriate surface treatment). Through material optimization combined with careful structural design, this invention has successfully achieved weight reduction and miniaturization of the power module, significantly improving its adaptability and economy for deployment on offshore platforms. To overcome the significant challenges of limited operating space and harsh maintenance conditions on offshore platforms, this invention prioritizes high maintainability in the structural design of the secondary circuit control unit. By innovatively integrating all functional boards into a standardized board box (drawer-type module), the number and complexity of internal wiring and external interfaces are significantly reduced, retaining only a few essential, highly integrated key interfaces. This design particularly emphasizes ease of operation; the power module employs a support rail and blind-plug connector design to ensure easy board box insertion and removal, precise positioning, and reliable connection. When maintenance or replacement is required, the operation process is extremely simplified—simply remove the protective panel on top of the power module, disconnect the board box's external plug, and the entire secondary circuit control unit, containing all boards, can be smoothly and efficiently pulled out as a whole along the support rail from the front of the equipment. This significantly saves maintenance space, simplifies operation steps, and significantly shortens troubleshooting and spare parts replacement time, effectively improving the maintainability and operational reliability of the equipment in harsh offshore environments. Addressing the significant challenges of extremely limited operating space and exceptionally difficult maintenance operations on offshore platforms, this invention also adheres to the core principle of ease of maintenance in the design of the bypass switch unit. It abandons the traditional approach of fixing the bypass switch by welding or securing it inside the module (which requires disassembling the entire module for maintenance). Instead, it innovatively designs the bypass switch as an independent, prefabricated functional module with a precisely integrated flange mounting structure on its outer shell. This module is directly and securely mounted to the corresponding interface of the valve string unit via the flange, and is equipped with an integrated electrical connection interface. When the bypass switch needs maintenance or replacement, maintenance personnel can easily and smoothly pull the entire bypass switch directly from the front of the equipment without disturbing the entire power module. This completely avoids the complex disassembly process, greatly simplifies the operation, significantly shortens maintenance downtime and recovery time, and effectively ensures the operational reliability and maintenance efficiency of the offshore platform's power system. Attached Figure Description

[0014] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the front three-dimensional structure of the present invention; Figure 2 This is a schematic diagram showing the disassembled structure of the valve string unit of the present invention; Figure 3 This is a schematic diagram showing the disassembled structure of the valve string crimping assembly of the present invention; Figure 4 This is a schematic diagram showing the disassembled structure of the secondary circuit board control unit of the present invention; Figure 5 This is a schematic diagram showing the disassembled structure of the DC capacitor unit of the present invention.

[0015] In the diagram: 1. Valve string unit; 101. Base positioning plate; 102. Upper frame mounting plate; 103. Unit base; 2. DC capacitor unit; 201. Capacitor; 202. Capacitor base; 203. Upper frame connecting plate; 204. Positive capacitor busbar; 205. Negative capacitor busbar; 3. Valve string crimping assembly; 301. Water-cooled radiator; 302. Crimped diode; 303. Crimped IGBT; 304. Transition pad; 4. Frame unit; 401. Valve string side plate; 402. Valve string top plate; 403. Valve string bottom plate; 404. Disc spring; 405. Guide sleeve; 406. Insulating side plate; 407. Top bolt; 5. Secondary circuit board control unit; 501. Board box; 502. Power supply board; 503. Bypass board; 504. Control board; 6. DC busbar; 7. Drive board unit; 8. Bypass switch unit. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0018] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0019] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0020] Please see Figures 1-5 As shown, a power module structure of a combined assembled DC converter valve includes a valve string unit 1 and a DC capacitor unit 2. The valve string unit 1 also includes a unit base 103, and the DC capacitor unit 2 also includes a capacitor 201. A frame unit 4 is fixedly installed in the middle of the upper surface of the unit base 103. A valve string pressing assembly 3 is provided inside the frame unit 4. A support rail is fixedly installed at the front end of the inner top surface of the valve string unit 1. A secondary circuit board control unit 5 is inserted and installed on the upper surface of the support rail. A drive board unit 7 is fixedly installed in the middle of the front end of the inner surface of the valve string unit 1. A bypass switch unit 8 is inserted and fixedly installed through the lower front end of the outer surface of the valve string unit 1. It should be noted that the DC capacitor unit 2 and the valve string unit 1 can be assembled independently as two main assembly units. The unit base 103, the capacitor base 202, and the base positioning plate 101 work together to ensure installation accuracy. They are connected as a whole by the upper frame mounting plate 102 and the upper frame connecting plate 203. This design ensures the overall assembly strength of the power module while also providing the advantage of flexible assembly. Especially in the event of serious faults such as power device failure, the connection between the DC capacitor unit 2 and the valve string unit 1 can be easily and quickly decoupled, allowing for the replacement of the faulty device without replacing the entire power module. Compared with the non-separable overall structure, this design greatly improves assembly and maintenance efficiency and is more in line with the operation and maintenance needs of offshore platforms. Secondly, the bypass switch unit 8 is an independent, prefabricated functional module with a precision-integrated flange mounting structure on its outer shell. The bypass switch unit 8 is directly and securely fixed to the corresponding interface of the valve string unit 1 through the flange. At the same time, it is equipped with an integrated electrical connection interface, thus eliminating the traditional method of fixing the bypass switch by welding or fastening it inside the module. When the bypass switch needs to be inspected or replaced, maintenance personnel do not need to disturb the entire power module. They only need to disconnect its integrated quick electrical connector to easily and smoothly pull the entire bypass switch directly from the front of the equipment. This effectively ensures the operational reliability and maintenance efficiency of the offshore platform's power system.

[0021] An upper frame mounting plate 102 is fixedly installed on the rear end of the upper surface of the valve string unit 1. An upper frame connecting plate 203 is fixedly installed on the front end of the upper surface of the capacitor 201. The rear end of the upper frame mounting plate 102 is inserted into the upper frame connecting plate 203 for fixed installation and connection. Base positioning plates 101 are fixedly installed on both sides of the rear end of the upper surface of the unit base 103. A capacitor base 202 is fixedly installed on the front end of the lower surface of the capacitor 201. The rear lower surface of the base positioning plate 101 is fixedly installed and connected to the front upper surface of the capacitor base 202. A positive capacitor busbar 204 is fixedly installed on the capacitor 201 through the terminal at the middle of the front end of the outer surface. A negative capacitor busbar 205 is fixedly installed at the front end of the positive capacitor busbar 204. A DC busbar 6 is fixedly connected between the positive capacitor busbar 204 and the negative capacitor busbar 205 and the valve string crimping assembly 3. The frame unit 4 includes two sets of valve string side plates 401. Insulating side plates 406 are fixedly installed on the middle part of the outer surface of the two sets of valve string side plates 401 that are close to each other. A valve string top plate 402 is fixedly installed on the upper part of the outer surface of the two sets of valve string side plates 401 that are close to each other. A valve string bottom plate 403 is fixedly installed on the lower part of the outer surface of the two sets of valve string side plates 401 that are close to each other. A guide sleeve 405 is inserted and fixedly installed through the middle of the upper surface of the valve string top plate 402. A disc spring 404 is movably sleeved on the outer surface of the guide sleeve 405. A top bolt 407 is spirally inserted and fixedly installed on the middle of the upper surface of the guide sleeve 405. It should be noted that the frame unit 4 is used for the installation of the valve string crimping assembly 3. By stacking the valve string crimping assembly 3 inside the frame unit 4, the top bolt 407 is screwed into the guide sleeve 405, causing the disc spring 404 to deform and generate the rated clamping force, which presses the components of the valve string crimping assembly 3 together with the water-cooled radiator 301 and the transition pad 304, thus completing the rapid assembly of the valve string crimping assembly 3. The valve string side plate 401 is made of 6061-T6 material.

[0022] The valve string crimping assembly 3 includes four sets of water-cooled radiators 301, which are stacked together. A guide pipe is installed between the water-cooled radiators 301. The other end of the guide pipe connected to one set of water-cooled radiators 301 extends outward through the valve string unit 1. A crimped IGBT 303 is crimped and fixedly installed on the outer surface of the three sets of water-cooled radiators 301 on the same side. A crimped diode 302 is crimped and fixedly installed on the upper surface of the lower set of water-cooled radiators 301. A transition pad 304 is provided above the crimped diode 302. The upper surface of the transition pad 304 is fixedly connected to the water-cooled radiator 301. The valve string crimping assembly 3 is fixedly installed in the middle of the upper surface of the valve string base plate 403. The upper surface of the valve string crimping assembly 3 abuts against the lower surface of the disc spring 404. It should be noted that the valve string press assembly 3, which consists of a press-fit IGBT 303, a water-cooled heat sink 301, a press-fit diode 302, and a transition pad 304, forms a half-bridge topology. All power devices are cooled by water cooling. The transition pad 304 is pressed tightly above the press-fit diode 302. The transition pad 304 has a frustum structure with an outer diameter of 135mm and a thickness of 35mm. It is made of 6061-T6 material. The transition pad 304 achieves uniform pressure diffusion between different press surfaces, ensuring the pressure uniformity and heat dissipation uniformity of the press-fit IGBT 303. The rated voltage of the press-fit IGBT 303 is 4.5kV.

[0023] The secondary circuit board control unit 5 includes a board box 501. A power supply board 502 is fixedly installed on the lower part of the inner surface of the board box 501. A bypass board 503 is fixedly installed on the upper part of the inner surface of the board box 501. A control board 504 is fixedly installed in the middle of the inner surface of the board box 501. Conical power guide pins are fixedly installed on both sides of the lower part of the rear end of the outer surface of the board box 501. Power guide sleeves are fixedly installed on both sides of the rear end of the upper surface of the support rail. The power guide pins are inserted into the power guide sleeves. An opening matching the board box 501 is opened on the upper part of the front end of the outer surface of the valve string unit 1. A protective panel is fixedly installed on the inner surface of the valve string unit 1 through the opening. It should be noted that the entire secondary circuit board control unit 5 is an integrated structure. The secondary circuit board control unit 5 includes a power supply board 502, a bypass board 503, a control board 504, and a board box 501. The power supply board 502, bypass board 503, and control board 504 are integrated and installed in the board box 501 and secured with screws. The entire secondary circuit board control unit 5 is placed in a drawer-type modular form on a support rail provided within the valve string unit 1. A protective panel is fixed to the front with hexagonal screws, and a conical power guide pin is inserted into the power guide sleeve at the rear for docking and fixation, significantly reducing... With fewer internal wiring and external interfaces, and only a few necessary highly integrated key interfaces retained, the system employs a support rail in conjunction with power guide pins and power guide sleeves to achieve blind insertion and removal, ensuring easy board insertion and removal, accurate positioning, and reliable connection. When maintenance is required, the protective panel can be removed to pull the entire secondary circuit board control unit 5 out of the valve string unit 1 along the support rail for maintenance. This significantly saves maintenance space, simplifies operation steps, and significantly shortens the time for troubleshooting and spare parts replacement, effectively improving the maintainability and operational support capabilities of the equipment in harsh marine environments.

[0024] In its application, this invention prioritizes lightweight and compact design to meet the demands of compact spaces, limited load-bearing capacity, and harsh environments on offshore platforms. Aluminum alloy is chosen as the key structural material, offering significant advantages over traditional steel (lower density). While maintaining structural strength, aluminum alloy effectively reduces the overall weight of the module. Furthermore, its excellent thermal conductivity aids in heat dissipation for power devices, while also providing good machinability and corrosion resistance. Processes such as anodizing and electroless chromium plating create a dense oxide film or conversion layer on the aluminum alloy surface. These treatments enhance surface hardness and corrosion resistance. Through material optimization combined with meticulous structural design, the power module achieves weight reduction and miniaturization, significantly improving its adaptability and economic efficiency for deployment on offshore platforms. Secondly, to overcome the significant challenges of limited operating space and harsh maintenance conditions on offshore platforms, all functional boards are highly integrated into a standardized board box 501, thereby reducing the number and complexity of internal wiring and external interfaces. Only a few necessary highly integrated key interfaces are retained. With the support rail in the valve string unit 1, when maintenance or replacement is required, it is only necessary to remove the protective panel above the power module and disconnect the external plug of the board box 501. The entire secondary circuit control unit 5, which contains all boards, can be smoothly and efficiently pulled out as a whole from the front of the equipment for maintenance along the support rail. Finally, abandoning the traditional approach of fixing or fastening the bypass switch inside the module (which requires disassembling the entire module for maintenance), the bypass switch is designed as an independent, prefabricated functional module with a precision-integrated flange mounting structure on its outer shell. This module is directly and securely mounted on the corresponding interface of valve string unit 1 via the flange, and is also equipped with an integrated electrical connection interface. When the bypass switch needs to be repaired or replaced, maintenance personnel do not need to disturb the entire power module. They only need to disconnect its integrated quick electrical connector to easily and smoothly pull the entire bypass switch directly from the front of the equipment, completely avoiding the complicated overall disassembly process, greatly simplifying the operation steps, and significantly shortening maintenance downtime and recovery time.

[0025] The above are merely embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A power module structure for a combined assembled DC converter valve, comprising a valve string unit (1) and a DC capacitor unit (2), characterized in that, The valve string unit (1) also includes a unit base (103), the DC capacitor unit (2) also includes a capacitor (201), a frame unit (4) is fixedly installed in the middle of the upper surface of the unit base (103), a valve string crimping assembly (3) is provided inside the frame unit (4), a support rail is fixedly installed at the front end of the inner top surface of the valve string unit (1), a secondary circuit board control unit (5) is inserted and installed on the upper surface of the support rail, a drive board unit (7) is fixedly installed in the middle of the front end of the inner surface of the valve string unit (1), and a bypass switch unit (8) is inserted and fixedly installed through the lower part of the front end of the outer surface of the valve string unit (1).

2. The power module structure of the combined assembled DC converter valve according to claim 1, characterized in that, The upper frame mounting plate (102) is fixedly installed on the rear end of the upper surface of the valve string unit (1), and the upper frame connecting plate (203) is fixedly installed on the front end of the upper surface of the capacitor (201). The rear end of the upper frame mounting plate (102) is inserted into the upper frame connecting plate (203) for fixed installation and connection. The rear end of the unit base (103) is fixedly installed on both sides of the rear end of the upper surface. The lower end of the lower surface of the capacitor (201) is fixedly installed on the front end of the lower surface. The lower end of the base positioning plate (101) is fixedly installed and connected to the upper end of the front end of the capacitor base (202).

3. The power module structure of the combined assembled DC converter valve according to claim 1, characterized in that, The capacitor (201) is fixedly mounted with a positive capacitor busbar (204) through a terminal at the middle of the front end of its outer surface. A negative capacitor busbar (205) is fixedly mounted at the front end of the positive capacitor busbar (204). A DC busbar (6) is fixedly connected to the positive capacitor busbar (204) and the negative capacitor busbar (205) together with the valve string crimping assembly (3).

4. The power module structure of a combined assembled DC converter valve according to claim 1, characterized in that, The frame unit (4) includes two sets of valve string side plates (401). Insulating side plates (406) are fixedly installed on the middle part of the outer surface of the two sets of valve string side plates (401) that are close to each other. A valve string top plate (402) is fixedly installed on the upper part of the outer surface of the two sets of valve string side plates (401) that are close to each other. A valve string bottom plate (403) is fixedly installed on the lower part of the outer surface of the two sets of valve string side plates (401) that are close to each other. A guide sleeve (405) is inserted and fixedly installed through the middle part of the upper surface of the valve string top plate (402). A disc spring (404) is movably sleeved on the outer surface of the guide sleeve (405). A top bolt (407) is spirally inserted and fixedly installed on the middle part of the upper surface of the guide sleeve (405).

5. The power module structure of a combined assembled DC converter valve according to claim 1, characterized in that, The valve string crimping assembly (3) includes four sets of water-cooled radiators (301). The four sets of water-cooled radiators (301) are stacked and spaced apart. The water-cooled radiators (301) are connected to each other by a flow guide pipe. The other end of the flow guide pipe connected to one set of water-cooled radiators (301) extends outward through the valve string unit (1). The outer surfaces of the three sets of water-cooled radiators (301) on the upper layer are all crimped and fixedly installed with crimped IGBTs (303) on the same side. A press-fit diode (302) is fixedly mounted on the upper surface of the lower group of water-cooled radiators (301). A transition pad (304) is provided above the press-fit diode (302). The upper surface of the transition pad (304) is fixedly connected to the water-cooled radiator (301). The valve string press-fit assembly (3) is fixedly mounted in the middle of the upper surface of the valve string base plate (403). The upper surface of the valve string press-fit assembly (3) abuts against the lower surface of the disc spring (404).

6. The power module structure of the combined assembled DC converter valve according to claim 1, characterized in that, The secondary circuit board control unit (5) includes a board box (501). A power supply board (502) is fixedly installed on the lower part of the inner surface of the board box (501). A bypass board (503) is fixedly installed on the upper part of the inner surface of the board box (501). A control board (504) is fixedly installed in the middle part of the inner surface of the board box (501). Conical power guide pins are fixedly installed on both sides of the lower part of the rear end of the outer surface of the board box (501). Power guide sleeves are fixedly installed on both sides of the rear end of the upper surface of the support rail. The power guide pins are inserted into the power guide sleeves. An opening matching the board box (501) is opened on the upper part of the front end of the outer surface of the valve string unit (1). A protective panel is fixedly installed on the inner surface of the valve string unit (1) through the opening.

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