A flexible straight converter valve sub-module replacement device and replacement method

Abstract

The application discloses a kind of flexible straight converter valve sub-module replacement device and replacement method, belong to high voltage direct current transmission technical field.It includes frame, lifting assembly, traction assembly, lifting tripping assembly, guide rail and control unit;First storage station, second storage station and third storage station are equipped in frame;Lifting assembly is set in frame, for lifting spare sub-module in frame;Guide rail is relatively set in the bottom of frame, and one end of guide rail is equipped with limit dog;Traction assembly drives lifting tripping assembly to move forward and backward, to drive spare sub-module to push into flexible straight converter valve tower or drive to be replaced sub-module to extract flexible straight converter valve tower;Control unit is connected with lifting assembly, traction assembly and lifting tripping assembly by communication.This application sets up the temporary storage station of spare sub-module, so that the replacement of new and old sub-module can be completed on tower, simple operation, improve module replacement efficiency and safety.

Description

Technical Field

[0001] This invention belongs to the field of high voltage direct current transmission technology, specifically relating to a flexible DC converter valve submodule replacement device and replacement method. Background Technology

[0002] Flexible DC transmission boasts significant advantages such as low loss and flexible controllability, enabling rapid response to grid fluctuations and making it suitable for long-distance, high-capacity power transmission. The supported flexible DC converter valve, employing a modular multilevel (MMC) topology, is the core equipment of flexible DC transmission. To achieve precise voltage and current control, each flexible DC converter valve typically consists of thousands of cascaded sub-modules. With the increase in voltage levels and transmission capacity, the weight of these sub-modules has increased from the initial 200 kg to over 500 kg. Furthermore, these sub-modules are usually installed on valve towers 5 to 15 meters above the ground, posing significant challenges to sub-module replacement and maintenance, and ensuring the safe and stable operation of the flexible DC converter valve.

[0003] Currently, submodule replacement is typically done in the following ways, each with its own advantages and disadvantages, but also some obvious limitations:

[0004] 1. Combination of replacement device and valve tower structural components: This method connects the suspension and fixing components of the replacement device to the insulating beam of the converter valve tower. A vertical lifting component lifts the sub-module, and a horizontal sliding component moves the sub-module horizontally. Manual assistance is used to move the sub-module in or out of the valve tower, and then a crane is used to replace the old sub-module with the new one. Although this method is relatively common, it is complex. Each time a sub-module is replaced, the replacement device must first be fixed to the insulating beam, and after the operation, it must be disassembled and re-fixed, resulting in low efficiency.

[0005] 2. Using the replacement device in conjunction with an aerial work platform: This method involves connecting the replacement device between the converter valve tower and the aerial work platform. Operators manually move the sub-modules onto the platform via guide rails or rollers, and then use a crane to replace the old sub-modules. However, this method requires a high level of physical fitness from the operators, and the aerial work platform should ideally not bear heavy loads. Since the replacement device is only connected to one side of the aerial work platform, there is a risk of the platform tipping over during the sub-module removal process, which is detrimental to safe operation.

[0006] 3. Hoisting the replacement device and submodule together: This method uses a crane to attach the replacement device to the converter valve tower, and then manually moves the submodule to the replacement fixture before hoisting it to the ground to complete the replacement of the old and new submodules. Although this method avoids some direct operational risks, it is cumbersome, requires a large number of personnel, and the fixture needs to be disassembled and reassembled multiple times, which is time-consuming and labor-intensive, resulting in low overall replacement efficiency.

[0007] In summary, existing submodule replacement methods generally suffer from operational complexity, insufficient security, and low efficiency, and there is an urgent need for more efficient and secure solutions to optimize this critical process. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a flexible DC converter valve submodule replacement device. The device sets up a temporary storage station for spare submodules, which enables the replacement of old and new submodules on the valve tower. The operation is simple and improves the efficiency and safety of module replacement.

[0009] This invention provides the following technical solution:

[0010] In a first aspect, a device for replacing a flexible DC-DC converter valve submodule is provided, comprising a frame, a lifting assembly, a traction assembly, a lifting trip assembly, guide rails, and a control unit. The frame is provided with a first storage station, a second storage station, and a third storage station for storing spare submodules or submodules to be replaced. The lifting assembly is located within the frame and is used to lift the spare submodule or submodule to be replaced within the frame. The guide rails are positioned opposite each other at the bottom of the frame, with one end of each guide rail having a limiting claw for connecting to the flexible DC-DC converter valve tower. The traction assembly is located between the guide rails and moves back and forth relative to the guide rails. The lifting trip assembly is located on the traction assembly and is used to connect to the bottom of the spare submodule or submodule to be replaced. The traction assembly drives the lifting trip assembly to move back and forth, thereby pushing the spare submodule into the flexible DC-DC converter valve tower or pulling the submodule to be replaced out of the flexible DC-DC converter valve tower. The control unit is communicatively connected to the lifting assembly, the traction assembly, and the lifting trip assembly.

[0011] As an optional technical solution of the present invention, the top of the frame is provided with a hoisting structure for hoisting.

[0012] As an optional technical solution of the present invention, the first storage station is located above the second storage station, and the third storage station is located on one side of the second storage station.

[0013] As an optional technical solution of the present invention, the lifting assembly includes a hydraulic cylinder, a module support plate, and a guide rod; the hydraulic cylinder is fixed in a first storage position within the frame, and the guide rod is fixed in a second storage position within the frame and is located in the extension direction of the hydraulic cylinder; the output end of the hydraulic cylinder is connected to a module support plate for supporting the spare parts sub-module, and the hydraulic cylinder drives the module support plate to move up and down along the guide rod to drive the spare parts sub-module to move up and down.

[0014] As an optional technical solution of the present invention, the traction assembly includes a traction motor, a transmission structure, and a traction trolley; the transmission structure is disposed between guide rails, and the traction motor is mounted on the guide rails; the output end of the traction motor is connected to the transmission structure, the traction trolley is disposed on the transmission structure, and the traction motor drives the transmission structure to operate so as to move the traction trolley back and forth.

[0015] As an optional technical solution of the present invention, the lifting release assembly includes a release motor, a push slider and a release slider; the release motor is located at one end of the traction trolley, the push slider is located inside the traction trolley, the output end of the release motor is connected to the push slider and is used to drive the push slider to move back and forth; the other end of the traction trolley is provided with a slot, and the release slider is located in the slot.

[0016] As an optional technical solution of the present invention, the end of the push slider away from the trip motor is provided with an inclined portion, and the end of the inclined portion near the trip motor is higher than the end near the trip slider; the lower side of the inclined portion extends to the bottom of the trip slider and moves back and forth with the push slider; as the inclined portion moves back and forth, the trip slider is pushed up or dropped, when the trip slider is pushed up it is connected to the crossbeam at the bottom of the spare part submodule or the replacement submodule, and when the trip slider is dropped it is separated from the crossbeam at the bottom of the spare part submodule or the replacement submodule.

[0017] As an optional technical solution of the present invention, the control unit is communicatively connected to the traction motor and the trip motor.

[0018] As an optional technical solution of the present invention, the flexible DC converter valve tower is provided with a supporting crossbeam, and the limiting claw is connected to the supporting crossbeam.

[0019] In a second aspect, a replacement method for the flexible DC converter valve submodule replacement device described in the first aspect is provided, comprising: using a crane to hoist the spare submodule to a first storage station;

[0020] The flexible DC converter valve submodule replacement device is lifted by a crane and placed at the corresponding position of the submodule to be replaced, so that the limit claws are connected to the flexible DC converter valve tower.

[0021] The operation control unit causes the lifting trip assembly to connect to the bottom of the replacement sub-module. The operation control unit causes the traction assembly to move backward, driving the replacement sub-module to be pulled out of the flexible DC converter valve tower and moved to the third storage position. The operation control unit causes the lifting trip assembly to detach from the bottom of the replacement module.

[0022] The operation control unit causes the lifting assembly to lower the spare parts sub-module to the second storage position;

[0023] The operation control unit connects the lifting trip assembly to the bottom of the spare parts sub-module. The operation control unit moves the traction assembly forward, pushing the spare parts sub-module into the flexible DC converter valve tower. The operation control unit disengages the lifting trip assembly from the bottom of the spare parts sub-module.

[0024] The operation control unit connects the lifting tripping assembly to the bottom of the sub-module to be replaced. The operation control unit also moves the traction assembly forward, moving the sub-module to be replaced to the second storage position, and hoisting the flexible DC converter valve sub-module replacement device and the sub-module to be replaced to the ground.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] The flexible DC converter valve submodule replacement device provided by this invention has a simple structure. The spare submodules enable the replacement of old and new submodules on the valve tower, improving the replacement efficiency and reducing power outage time. At the same time, the control unit operates each component, which greatly reduces the physical requirements of the staff, reduces labor intensity, and improves the safety of the submodule replacement work, ensuring the personal safety of the operators. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the flexible DC converter valve submodule replacement device in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the lifting assembly in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the traction component in an embodiment of the present invention;

[0030] Figure 4 yes Figure 3 A magnified view of a portion of the image;

[0031] Figure 5 This is a bottom schematic diagram of the submodule to be replaced in an embodiment of the present invention;

[0032] Figure 6 yes Figure 5 A magnified view of a portion of the image;

[0033] Figure 7 This is a schematic diagram of the working state of the flexible DC converter valve submodule replacement device in an embodiment of the present invention. Figure 1 ;

[0034] Figure 8 This is a schematic diagram of the working state of the flexible DC converter valve submodule replacement device in an embodiment of the present invention. Figure 2 ;

[0035] Figure 9This is a schematic diagram of the working state of the flexible DC converter valve submodule replacement device in an embodiment of the present invention. Figure 3 ;

[0036] Figure 10 This is a schematic diagram of the working state of the flexible DC converter valve submodule replacement device in an embodiment of the present invention. Figure 4 ;

[0037] Figure 11 This is a schematic diagram of the working state of the flexible DC converter valve submodule replacement device in an embodiment of the present invention. Figure 5 .

[0038] The diagram is labeled as follows: 10. Frame, 11. First storage station, 12. Second storage station, 13. Third storage station, 20. Lifting structure, 30. Power supply, 40. Lifting assembly, 41. Hydraulic cylinder, 42. Module support plate, 43. Guide rod, 50. Traction assembly, 51. Guide rail, 52. Traction motor, 53. Conveying structure, 54. Traction trolley, 55. Lifting release assembly, 56. Release motor, 57. Push slider, 58. Release slider, 60. Limiting claw, 70. Flexible direct current converter valve tower, 80. Spare parts sub-module, 90. Replacement sub-module, 100. Control unit, 110. Support beam, 120. Beam. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0040] Example 1

[0041] like Figure 1 As shown, this embodiment provides a flexible DC converter valve submodule replacement device, including a frame 10, a power supply 30, a lifting assembly 40, a traction assembly 50, a lifting trip assembly 55, a guide rail 51, and a control unit 100.

[0042] The frame 10 is provided with a first storage station 11, a second storage station 12, and a third storage station 13 for storing spare sub-modules 80 or replacement sub-modules 90. Spare sub-modules 80 are temporarily stored in the first storage station 11. After the replacement sub-module 90 is removed, the spare sub-module 80 can be pushed into the valve tower, where the replacement of the old and new sub-modules can be completed.

[0043] Furthermore, the top of the frame 10 is provided with a hoisting structure 20 for hoisting.

[0044] like Figure 1 As shown, the first storage station 11 is located above the second storage station 12, and the third storage station 13 is located on one side of the second storage station 12.

[0045] The lifting assembly 40 is located within the frame 10 and is used to lift the spare submodule 80 or the replacement submodule 90 within the frame 10. Figure 2 As shown, the lifting assembly includes a hydraulic cylinder 41, a module support plate 42, and a guide rod 43. The hydraulic cylinder 41 is fixed in the first storage position 11 within the frame 10, and the guide rod 43 is fixed in the second storage position 12 within the frame 10 and is located in the extension direction of the hydraulic cylinder 41. The output end of the hydraulic cylinder 41 is connected to the module support plate 42 for supporting the spare sub-module 80. The hydraulic cylinder 41 drives the module support plate 42 to move up and down along the guide rod 43, thereby driving the spare sub-module 80 to move up and down.

[0046] The guide rails 51 are positioned opposite each other at the bottom of the frame 10. One end of the guide rails 51 is provided with a limiting claw 60 for connecting the flexible DC converter valve tower 70. The traction assembly 50 is positioned between the guide rails 51 and moves back and forth relative to the guide rails 51. The lifting release assembly 55 is positioned on the traction assembly 50 and is used to connect the bottom of the spare sub-module 80 or the replacement sub-module 90. The traction assembly 50 drives the lifting release assembly 55 to move back and forth, so as to push the spare sub-module 80 into the flexible DC converter valve tower 70 or pull the replacement sub-module 90 out of the flexible DC converter valve tower 70.

[0047] like Figure 3 As shown, the traction assembly 50 includes a traction motor 52, a transmission structure 53, and a traction trolley 54. The transmission structure 53 is disposed between guide rails 51, and the traction motor 52 is mounted on the guide rails 51. The output end of the traction motor 52 is connected to the transmission structure 53. The traction trolley 54 is disposed on the transmission structure 53, and the traction motor 52 drives the transmission structure 53 to rotate, thereby moving the traction trolley 54 back and forth.

[0048] like Figure 4 As shown, the lifting release assembly 55 includes a release motor 56, a push slider 57, and a release slider 58. The release motor 56 is located at one end of the traction trolley 54, and the push slider 57 is located inside the traction trolley 54. The output end of the release motor 56 is connected to the push slider 57 to drive the push slider 57 to move back and forth. The other end of the traction trolley 54 has a slot, and the release slider 58 is located in the slot. The release slider 58 is C-shaped and can move up and down within the slot, but cannot move laterally.

[0049] Furthermore, the end of the push-pull slider 57 furthest from the trip motor 56 is provided with an inclined portion, and the end of the inclined portion near the trip motor 56 is higher than the end near the trip slider 58; the lower side of the inclined portion extends to the bottom of the trip slider 58, moving back and forth with the push-pull slider 57. As the inclined portion moves back and forth, the trip slider 58 is pushed up or lowered. When the trip slider 58 is pushed up, it connects to the crossbeam 120 at the bottom of the spare parts submodule 80 or the replacement submodule 90; when the trip slider 58 is lowered, it separates from the crossbeam 120 at the bottom of the spare parts submodule 80 or the replacement submodule 90. Figure 5 and Figure 6 As shown, this is a crossbeam 120.

[0050] Basic working process of the lifting trip assembly:

[0051] When the lifting release assembly 55 needs to be connected to the submodule, the operation control unit 100 controls the release motor 56 to rotate, which pushes the push slider 57 forward via a screw. The inclined part at the front of the push slider 57 lifts the C-shaped release slider 58, and the notch of the release slider 58 connects with the crossbeam of the submodule's base plate. At this time, when the traction trolley 54 moves back and forth, it will drive the lifting release assembly 55 and the submodule to move synchronously. When the lifting release assembly 55 needs to be separated from the submodule, the operation control unit 100 controls the release motor 56 to rotate in the opposite direction, which drives the push slider 57 backward via a screw. The inclined part at the front of the push slider 57 moves away from the release slider 58, and the release slider 58 falls, ultimately separating the release slider 58 from the crossbeam of the submodule's base plate. The movement of the submodule can be achieved without manual intervention, improving work efficiency and safety.

[0052] The control unit 100 is communicatively connected to the lifting assembly 40, the traction assembly 50, and the lifting release assembly 55. Specifically, the control unit 100 is communicatively connected to the traction motor 52 and the release motor 56, and the control unit is manually operated to control the operation of the lifting assembly 40, the traction motor 52, and the release motor 56.

[0053] like Figure 7 As shown, the flexible DC converter valve tower 70 is provided with a supporting crossbeam 110, and the limiting claw 60 is connected to the supporting crossbeam 110. In this embodiment, two limiting claws 60 are provided, which are mounted on the supporting crossbeam 110 and fixed to both sides of the guide rail.

[0054] The power supply 30 is used to provide power to the various components within the replacement device.

[0055] Example 2

[0056] This embodiment, based on Embodiment 1, provides a replacement method. For example... Figures 7-11As shown, in this embodiment, the side where the flexible DC converter valve tower 70 is located is designated as the front side, and the side where the replacement device is located is designated as the rear side.

[0057] The replacement process includes:

[0058] Step 1: Use a crane to hoist the spare parts sub-module 80 to the first storage station 11.

[0059] Step 2: Use a crane to lift the flexible DC converter valve submodule replacement device, adjust the lifting rope to keep the replacement device horizontal during operation, lift the flexible DC converter valve submodule replacement device to the corresponding position of the submodule to be replaced 90, and make the limit claw 60 connect to the support beam 110 on the flexible DC converter valve tower 70.

[0060] Step 3: The operation control unit 100 connects the lifting release assembly 55 to the bottom of the replacement sub-module 90, the operation control unit 100 moves the traction assembly 50 backward, driving the replacement sub-module 90 to pull out the flexible DC converter valve tower 70 and move to the third storage station 13, and the operation control unit 100 disengages the lifting release assembly 55 from the bottom of the replacement sub-module 90.

[0061] Step 4: Operate the control unit 100 to lower the spare parts sub-module 80 to the second storage station 12 using the lifting assembly 40.

[0062] Step 5: The operation control unit 100 connects the lifting trip assembly 55 to the bottom of the spare parts sub-module 80, the operation control unit 100 moves the traction assembly 50 forward, and pushes the spare parts sub-module 80 into the flexible DC converter valve tower 70, and the operation control unit 100 disengages the lifting trip assembly 55 from the bottom of the spare parts sub-module 80.

[0063] Step 6: Operate the control unit 100 to connect the lifting release assembly 55 to the bottom of the sub-module 90 to be replaced, and operate the control unit 100 to move the traction assembly 50 forward, driving the sub-module 90 to be replaced to the second storage position 12, and hoist the flexible DC converter valve sub-module replacement device and the sub-module 90 to the ground.

[0064] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0065] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0066] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A flexible DC converter valve submodule replacement device, characterized in that, It includes a frame (10), a lifting assembly (40), a traction assembly (50), a lifting release assembly (55), a guide rail (51), and a control unit (100). The frame (10) is provided with a first storage station (11), a second storage station (12) and a third storage station (13) for storing spare sub-modules (80) or replacement sub-modules (90). The lifting assembly (40) is located inside the frame (10) and is used to lift the spare parts sub-module (80) inside the frame (10). The guide rail (51) is positioned opposite to the bottom of the frame (10), and one end of the guide rail (51) is provided with a limiting claw (60) for connecting the flexible DC converter valve tower (70); the traction assembly (50) is positioned between the guide rails (51) and moves back and forth relative to the guide rails (51); the lifting release assembly (55) is positioned on the traction assembly (50) and is used to connect the bottom of the spare sub-module (80) or the replacement sub-module (90); the traction assembly (50) drives the lifting release assembly (55) to move back and forth, so as to push the spare sub-module (80) into the flexible DC converter valve tower (70) or drive the replacement sub-module (90) to be pulled out of the flexible DC converter valve tower (70). The control unit (100) is communicatively connected to the lifting assembly (40), the traction assembly (50), and the lifting release assembly (55). The first storage station (11) is located above the second storage station (12), and the third storage station (13) is located on one side of the second storage station (12); The lifting assembly (40) includes a hydraulic cylinder (41), a module support plate (42), and a guide rod (43). The hydraulic cylinder (41) is fixed in the first storage station (11) inside the frame (10), and the guide rod (43) is fixed in the second storage station (12) inside the frame (10) and is located in the extension direction of the hydraulic cylinder (41). The output end of the hydraulic cylinder (41) is connected to the module support plate (42) for supporting the spare sub-module (80). The hydraulic cylinder (41) drives the module support plate (42) to move up and down along the guide rod (43) to drive the spare sub-module (80) to move up and down. The traction assembly (50) includes a traction motor (52), a transmission structure (53), and a traction trolley (54); the transmission structure (53) is located between guide rails (51), and the traction motor (52) is mounted on the guide rails (51); the output end of the traction motor (52) is connected to the transmission structure (53), and the traction trolley (54) is located on the transmission structure (53). The traction motor (52) drives the transmission structure (53) to rotate so as to move the traction trolley (54) back and forth. The lifting release assembly (55) includes a release motor (56), a push slider (57), and a release slider (58); the release motor (56) is located at one end of the traction trolley (54), the push slider (57) is located inside the traction trolley (54), and the output end of the release motor (56) is connected to the push slider (57) to drive the push slider (57) to move back and forth; the other end of the traction trolley (54) is provided with a slot, and the release slider (58) is located in the slot; The push slider (57) has an inclined portion at the end away from the trip motor (56), and the end of the inclined portion near the trip motor (56) is higher than the end near the trip slider (58); the lower side of the inclined portion extends to the bottom of the trip slider (58) and moves back and forth with the push slider (57); as the inclined portion moves back and forth, the trip slider (58) is pushed up or down. When the trip slider (58) is pushed up, it connects to the crossbeam (120) at the bottom of the spare part submodule (80) or the replacement submodule (90). When the trip slider (58) is lowered, it separates from the crossbeam at the bottom of the spare part submodule (80) or the replacement submodule (90).

2. The flexible DC converter valve submodule replacement device according to claim 1, characterized in that: The top of the frame (10) is provided with a hoisting structure (20) for hoisting.

3. The flexible DC converter valve submodule replacement device according to claim 1, characterized in that: The control unit (100) is communicatively connected to the traction motor (52) and the trip motor (56).

4. The flexible DC converter valve submodule replacement device according to claim 1, characterized in that: The flexible DC converter valve tower (70) is provided with a support beam (110), and the limiting claw (60) is connected to the support beam (110).

5. A replacement method for the flexible DC converter valve submodule replacement device according to any one of claims 1-4, characterized in that, include: The spare parts sub-module (80) is hoisted to the first storage station (11) using a crane. The flexible DC converter valve submodule replacement device is lifted by a crane and placed at the corresponding position of the submodule to be replaced (90), and the limiting claw (60) is connected to the flexible DC converter valve tower (70). The operation control unit (100) causes the lifting trip assembly (55) to connect to the bottom of the replacement sub-module (90), the operation control unit (100) causes the traction assembly (50) to move backward, driving the replacement sub-module (90) to pull out the flexible DC converter valve tower (70) and move to the third storage station (13), the operation control unit (100) causes the lifting trip assembly (55) to disengage from the bottom of the replacement sub-module (90); The operation control unit (100) causes the lifting assembly (40) to lower the spare parts sub-module (80) to the second storage position (12). The operation control unit (100) causes the lifting trip assembly (55) to connect to the bottom of the spare parts sub-module (80), the operation control unit (100) causes the traction assembly (50) to move forward, driving the spare parts sub-module (80) to push into the flexible DC converter valve tower (70), and the operation control unit (100) causes the lifting trip assembly (55) to disengage from the bottom of the spare parts sub-module (80); The operation control unit (100) causes the lifting trip assembly (55) to connect to the bottom of the replacement sub-module (90), and the operation control unit (100) causes the traction assembly (50) to move forward, driving the replacement sub-module (90) to the second storage station (12), and hoisting the flexible DC converter valve sub-module replacement device and the replacement sub-module (90) to the ground.

Images