Flexible direct-current power transmission converter valve tower

Abstract

The invention provides a flexible direct current transmission converter valve tower. The flexible direct current transmission converter valve tower comprises a bottom insulation supporting column, two rows of power assemblies symmetrically arranged on the bottom insulation supporting column, a voltage-sharing shielding mechanism, a cooling water pipeline and an optical fiber. The two columns of power assemblies are connected at intervals in an insulating manner, each power assembly comprises a plurality of layers of layer units which are connected at intervals in an insulating manner, each layer unit comprises a plurality of valve sections, and all the valve sections of the two columns of power assemblies form spiral electrical primary series connection along the peripheral side of the valve tower through connecting busbars; according to the valve tower, all the valve sections in the valve tower are arranged to be of a series connection structure, the connecting busbars in the whole valve tower are spirally arranged in a rising mode along the outer side of the valve tower, the path length of the connecting busbars is greatly reduced, the line stray feeling in the valve tower is reduced, and the connecting busbar cost is reduced; and the valve tower connecting busbar is arranged on the outer side of the valve tower, so that an infrared temperature monitoring instrument and a camera in the flexible straight valve hall can detect the temperature at the joint of the valve tower connecting busbar and the head operation condition of the power sub-module in real time, and operation and maintenance management of field personnel is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of flexible direct current transmission, and in particular relates to a flexible direct current transmission converter valve tower. Background Art

[0002] UHV flexible DC transmission technology is the core equipment for building smart and strong power grids. It has significant advantages in island power supply, capacity expansion and transformation of urban distribution networks, AC system interconnection, and large-scale wind farm grid connection. It has become a strategic choice for the future development of large power grids. UHV flexible DC transmission converter valve is the core equipment of flexible DC transmission projects. It realizes high-voltage and high-power AC and DC conversion and transmission by connecting several basic functional unit modules in series. With the increase in voltage levels of flexible DC transmission projects, the development of offshore flexible DC fields, and technical competition within the industry in recent years, the floor space, cost, and tolerance of converter valve equipment to complex scenarios such as earthquakes and shipping are constantly facing new challenges.

[0003] At present, under the influence of multiple requirements such as voltage level, power capacity, land occupation requirements of converter stations, and construction cost of flexible direct current transmission converter valves, the number of submodules in a single bridge arm of flexible direct current converter valves has gradually increased and basically maintained at 200 to 240. Under this scale, the current flexible direct current valve tower design usually designs the number of flexible direct current converter valve towers for a single bridge arm to be 2 or more, reducing the number and height of submodules accommodated in each valve tower. Although this is beneficial to the seismic design of the valve tower, a certain distance needs to be left between each tower to ensure the air insulation clearance between the valve towers, and the total required spacing must at least meet the air insulation clearance between the first and last ends of the series connection of half the number of submodules in a single bridge arm, significantly increasing the floor area of ​​a single bridge arm; in order to improve the seismic performance of the valve tower, each valve section is usually supported by 4 interlayer insulators on each layer, and a steel platform is arranged under the first layer of the valve section to provide support for the valve section. The steel platform is then fixed to the valve hall floor through the bottom insulator. This approach will first result in at least one more insulator flange size between adjacent valve sections, increasing Increase the length of the valve tower. Secondly, the first-layer valve section and the steel platform need to maintain an air insulation clearance between the two ends of the series connection of a layer of sub-modules, which requires insulator support, but increases the height of the valve tower. Finally, these added interlayer insulators and steel platforms will increase the cost of the valve tower. Unreasonable sub-module series arrangement structure in the valve tower, such as the existing structure in which the sub-modules are connected in a Z-shape at the head and tail, makes the connection busbar path between the sub-modules too long, which not only increases the line inductance and affects the performance stability of the sub-modules and the valve tower, but also increases the cost of the valve tower due to the excessively long busbar, and also makes the directions of the busbar connection points different, which is not conducive to remote monitoring of the operation of the valve tower. For example, the existing structure in which the sub-modules are back-to-back to form a valve section must set an electrical insulation clearance inside the valve section, which increases the volume of a single valve section and is not conducive to reducing the footprint of the valve tower. Summary of the invention

[0004] In order to overcome the shortcomings of the valve tower in the prior art, such as large floor space and large line noise, the present invention proposes a flexible DC power transmission converter valve tower, the valve tower comprising: a bottom insulating support, two rows of power components symmetrically arranged on the bottom insulating support, a voltage-equalizing shielding mechanism surrounding the two rows of power components, and a cooling water pipeline and an optical fiber connected to the power components;

[0005] The two columns of power components are connected with insulation intervals, and the power components include layer units connected with multiple layers of insulation intervals. The layer units include multiple valve sections. All valve sections of the two columns of power components are connected by a busbar to form a spiral electrical primary series connection along the outer peripheral side of the valve tower.

[0006] Preferably, the connecting busbars include valve section busbars, valve tower straight busbars and valve tower inclined busbars;

[0007] Two adjacent valve sections in the layer unit are connected in series via the inter-valve section busbar;

[0008] Two valve sections at the same end in two layer units at the same layer are connected in series through the valve tower straight busbar;

[0009] The valve sections in two layer units located in two adjacent layers and arranged obliquely and away from the two ends of the straight busbar of the valve tower are connected in series through the oblique busbar of the valve tower.

[0010] Preferably, the valve section includes a bracket and a plurality of power sub-modules arranged on the bracket, and the plurality of power sub-modules of each valve section are connected in series through a plurality of connecting sub-busbars, and the plurality of connecting sub-busbars are arranged along the outer side of the valve tower. The connecting sub-busbars located at both ends of the plurality of connecting sub-busbars of each valve section are connected to the inter-valve section busbar, the straight busbar of the valve tower or the inclined busbar of the valve tower.

[0011] Preferably, the number of layers of the layer unit is 4-6 layers.

[0012] Preferably, the two columns of power components are connected by a plurality of inter-column inclined insulators for insulation spacing.

[0013] Preferably, two adjacent layer units are connected by insulating intervals of multiple groups of interlayer support insulators, and the multiple groups of interlayer support insulators are arranged at both ends of the layer unit and between two adjacent valve sections in the layer unit.

[0014] Preferably, adjacent interlayer post insulators are connected via valve section inclined insulators.

[0015] Preferably, the bracket includes two metal side beams and an insulating beam connected between the two metal side beams, and the plurality of power sub-modules are arranged on the insulating beam.

[0016] Preferably, the voltage-equalizing shielding mechanism includes a bottom voltage-equalizing ring assembly, an interlayer shielding cover assembly and a top voltage-equalizing ring assembly surrounding the two columns of power components. The bottom voltage-equalizing ring assembly and the interlayer shielding cover assembly are fixed on the metal side beam of the valve section, and the top voltage-equalizing ring assembly is supported above the topmost layer unit by interlayer support insulators.

[0017] Preferably, the bottom insulating support includes two support units corresponding to the two columns of power components, the support unit includes a plurality of bottom support insulators and a bottom inclined insulator connecting two adjacent bottom support insulators, and the layer unit located at the bottom layer is arranged on the top of the plurality of bottom support insulators.

[0018] Preferably, the bottom main cooling water pipe, the interlayer cooling water pipe and the optical fiber of the cooling water pipeline are arranged between the two rows of power components.

[0019] Compared with the closest prior art, the present invention has the following beneficial effects:

[0020] The present invention provides a flexible direct current transmission converter valve tower, comprising a bottom insulating support, two rows of power components symmetrically arranged on the bottom insulating support, a voltage-equalizing shielding mechanism surrounding the two rows of power components, and a cooling water pipeline and an optical fiber connected to the power components; the two rows of power components are connected with insulation intervals, the power components include layer units connected with multiple layers of insulation intervals, the layer units include multiple valve sections, and all valve sections of the two rows of power components are connected in a spiral electrical primary series connection along the outer peripheral side of the valve tower through a connecting busbar; the valve tower is set as a series structure through all valve sections in the valve tower, and the connecting busbar in the entire valve tower is arranged in a spiral ascending manner along the outer side of the valve tower, which greatly reduces the path length of the connecting busbar, reduces the line noise in the valve tower, and reduces the cost of the connecting busbar; and the valve tower connecting busbar is arranged on the outside of the valve tower, which is conducive to the infrared temperature monitoring instrument and camera in the flexible direct current valve hall to detect the temperature at the connection point of the valve tower connecting busbar and the operation status of the power sub-module head in real time, which is convenient for on-site personnel to operate and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a valve tower structure of a flexible DC transmission converter valve provided by the present invention;

[0022] Figure 2 A schematic diagram of the connection structure of a connecting busbar and a connecting sub-busbar provided by the present invention;

[0023] Figure 3A schematic diagram of the valve section structure provided by the present invention;

[0024] Figure 4 A schematic diagram of the position connection relationship between the column-to-column oblique-stayed insulator and the valve-section oblique-stayed insulator provided by the present invention;

[0025] Figure 5 This is a schematic diagram of the positional relationship between the cooling water pipeline and the optical fiber provided by the present invention.

[0026] Among them, 1. bottom pillar insulator; 2. bottom diagonal insulator; 3. interlayer pillar insulator; 4. valve section; 5. bottom equalizing ring assembly; 6. interlayer shielding cover assembly; 7. top equalizing ring assembly; 8. drip tray assembly; 9. bottom main cooling water pipe; 10. interlayer cooling water pipe; 11. bottom main optical fiber groove; 12. interlayer optical fiber groove; 13. valve tower inclined busbar; 14. valve tower straight busbar; 15. connecting sub-busbar; 16. busbar between valve sections; 17. inter-row diagonal insulator; 18. valve section diagonal insulator; 19. power sub-module; 20. metal side beam; 21. insulation beam; 22. valve section cooling water pipe. DETAILED DESCRIPTION

[0027] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0028] Embodiment 1:

[0029] The present invention provides a flexible DC power transmission converter valve tower, such as Figure 1 As shown, the valve tower includes: a bottom insulating support, two rows of power components symmetrically arranged on the bottom insulating support, a voltage-equalizing shielding mechanism surrounding the two rows of power components, and a cooling water pipeline and an optical fiber connected to the power components;

[0030] The two columns of power components are connected with insulation intervals, and the power components include layer units connected with multiple layers of insulation intervals. The layer units include multiple valve sections 4. All valve sections 4 of the two columns of power components are connected by a busbar to form a spiral electrical primary series connection along the outer peripheral side of the valve tower.

[0031] The valve tower is set as a series structure through all valve sections in the valve tower. The connecting busbars in the entire valve tower are arranged in a spiral shape along the outside of the valve tower, which greatly reduces the length of the connecting busbar path, reduces the line noise in the valve tower, and reduces the cost of the connecting busbar. The valve tower connecting busbar is arranged on the outside of the valve tower, which is conducive to the infrared temperature monitoring instrument and camera in the flexible valve hall to detect the temperature of the connecting busbar connection on the outer side of the valve tower and the operation status of the power sub-module head in real time, which is convenient for on-site personnel to operate and manage.

[0032] In this embodiment, Figure 2 and Figure 3As shown, the valve section 4 includes a bracket and a plurality of power sub-modules 19 arranged on the bracket. The plurality of power sub-modules 19 of a valve section 4 are connected in series through a plurality of connecting sub-busbars 15. The plurality of connecting sub-busbars 15 are arranged along the outer side of the valve tower. The connecting sub-busbars 15 located at both ends of the plurality of connecting sub-busbars 15 of each valve section 4 are connected to the inter-valve section busbar 16, the valve tower straight busbar 14 or the valve tower inclined busbar 13, so that the connecting sub-busbars 15, the inter-valve section busbar 16, the valve tower straight busbar 14 and the valve tower inclined busbar 13 together form a spiral arrangement along the outer peripheral side of the valve tower, as shown in FIG. Figure 2 shown.

[0033] In this embodiment, the bracket includes two metal side beams 20 and an insulating beam 21 connected between the two metal side beams 20 , and the plurality of power sub-modules 19 are disposed on the insulating beam 21 .

[0034] In an optional implementation, the valve section 4 can accommodate up to 6 power sub-modules 19, and a number of insulating beams 21 span between two metal side beams 20 to form a bracket of the valve section 4. The 6 power sub-modules 19 are fixedly connected to the several insulating beams 21, and the length, width and height of the entire valve section are 2846mm×1996mm×980mm.

[0035] In this embodiment, the valve section 4 further includes a valve section cooling water pipe 22 , which is located in front of and below the power sub-module 19 , fixed on the insulating beam 21 , and connected to the cooling water pipe of the power sub-module 19 .

[0036] In this embodiment, the connecting busbars include a valve section busbar 16, a valve tower straight busbar 14 and a valve tower inclined busbar 13;

[0037] Two adjacent valve sections 4 in the layer unit are connected in series via the inter-valve section busbar 16;

[0038] Two valve sections 4 at the same end in two layer units at the same layer are connected in series through the valve tower straight busbar 14;

[0039] The valve sections 4 located in two adjacent layers and arranged obliquely and away from the two ends of the valve tower straight busbar 14 are connected in series through the valve tower oblique busbar 13 .

[0040] In this embodiment, the valve sections 4 and the input and output line interfaces of the power sub-module 19 in each column and layer of the valve tower, that is, in each layer unit, are arranged on the same side facing the outside of the valve tower, and are connected through the inter-valve section busbar 16 and the connecting sub-busbar 15. The valve sections 4 are connected along the shortest path between columns and layers through the valve tower straight busbar 14 and the valve tower inclined busbar 13, respectively. That is, the two valve sections 4 located at the same end in two layer units on the same layer are connected in series through the valve tower straight busbar 14, and the valve sections 4 located in two adjacent layer units and arranged obliquely in two layers are connected in series through the valve tower inclined busbar 13. The 240 power sub-modules 19 in the valve tower are electrically connected in series through the valve tower inclined busbar 13, the valve tower straight busbar 14, the valve section busbar 16, and the connecting sub-busbar 15. The busbars in the entire valve tower are arranged in a spiral along the outer side of the valve tower, which greatly reduces the length of the connecting busbar path, reduces the line noise in the valve tower, and reduces the busbar cost. In addition, the valve tower inclined busbar 13, the valve tower straight busbar 14, the valve section busbar 16, and the connecting sub-busbar 15 are arranged on the outer side of the valve tower, which is also conducive to the infrared temperature monitoring instrument to detect the temperature of the valve tower busbar connection and the operation status of the sub-module head in real time, which is beneficial to the operation and maintenance management of the valve tower.

[0041] In this embodiment, the number of layers of the layer unit is 4-6 layers.

[0042] Since too many layers of the valve tower are not conducive to the overall earthquake resistance, and too few layers will increase the floor space, in this embodiment, optionally, the total number of power sub-modules 19 in the two layer units is 1 / 5 of the total number of all power sub-modules 19 in the two columns of power components, so that the entire valve tower has a 5-layer structure, that is, the number of layers of the layer units is 5, thereby reducing the overall floor space of the valve tower while ensuring the earthquake resistance effect.

[0043] Specifically, the valve tower is divided into 2 columns, each column has 5 layers, and each column and each layer of the valve tower includes 4 valve sections 4, that is, one layer unit includes 4 valve sections 4, so that the entire valve tower contains a total of 40 valve sections 4 and 240 power sub-modules 19; in this embodiment, the spacing between the power components of the two columns is the electrical insulation clearance of all power sub-modules 19 in the two layer units, and the spacing between the two adjacent layer units is the electrical insulation clearance of all power sub-modules 19 in the two layer units; each layer of the valve tower, that is, two layer units, contains 48 power sub-modules 19, so there is an electrical insulation clearance of 48 power sub-modules 19 between the layers and columns of the valve tower.

[0044] If the total number of power sub-modules 19 is reduced, a 4-layer valve tower structure can be adopted, that is, the number of layers of the layer unit is 4, and the layout of each power sub-module 19 is similar to the above-mentioned 5-layer valve tower; or the 5-layer valve tower structure can be retained but the floor area is reduced, that is, the number of valve sections 4 included in one layer unit is reduced.

[0045] In this embodiment, Figure 4 As shown, the two columns of power components are connected with each other by a plurality of inter-column inclined insulators 17 for insulation spacing.

[0046] In this embodiment, the bottom insulating support includes two support units corresponding to the two columns of power components, and the support unit includes multiple bottom support insulators 1 and a bottom inclined insulator 2 connecting two adjacent bottom support insulators 1, and the layer unit located at the bottom layer is arranged on the top of the multiple bottom support insulators 1.

[0047] Specifically, each column of the valve tower, i.e., the four valve sections 4 of the first layer of a power component are supported by a total of ten bottom support insulators 1, and two adjacent valve sections 4 share two bottom support insulators 1 for support, thereby effectively reducing the length and footprint of the valve tower.

[0048] In this embodiment, two adjacent layer units are connected by multiple groups of interlayer support insulators 3 for insulation spacing. The multiple groups of interlayer support insulators 3 are arranged at both ends of the layer unit and between two adjacent valve sections 4 in the layer unit, so that one group of interlayer support insulators 3 is shared between two adjacent valve sections 4 in one layer unit.

[0049] Specifically, the second to fourth valve sections 4 are supported by interlayer support insulators 3, wherein two interlayer support insulators 3 are shared between the valve sections 4. This can reduce the number of bottom and interlayer support insulators used, and eliminate the need for an additional steel platform and support insulators between the steel platform and the valve section 4, effectively reducing the height and cost of the valve tower.

[0050] In this embodiment, Figure 4 As shown, the interlayer support insulators 3 adjacent to each other, that is, the interlayer support insulators 3 located inside the valve tower, are connected by valve section inclined insulators 18, so as to improve the anti-seismic performance of the valve tower.

[0051] In this embodiment, the voltage-equalizing shielding mechanism includes a bottom voltage-equalizing ring assembly 5, an interlayer shielding cover assembly 6 and a top voltage-equalizing ring assembly 7 surrounding the two columns of power components. The bottom voltage-equalizing ring assembly 5 and the interlayer shielding cover assembly 6 are fixed on the metal side beam 19 of the valve section 4, and the potential is selected nearby, so that the size of the bottom voltage-equalizing ring assembly 5 and the interlayer shielding cover assembly 6 can be shrunk as much as possible to the inside of the valve tower to avoid additional electrical insulation clearance across the potential; the top voltage-equalizing ring assembly 7 is supported above the layer unit located on the top layer by the interlayer support insulator 3.

[0052] In this embodiment, Figure 5 As shown, the bottom main cooling water pipe 9, the interlayer cooling water pipe 10 and the optical fiber of the cooling water pipeline are arranged between the two rows of power components.

[0053] In this embodiment, the cooling water pipeline also includes a drip tray assembly 8, which includes multiple drip trays surrounding the bottom of the bottom insulating support, and is used to receive condensed water from the bottom main cooling water pipe 9 and the interlayer cooling water pipe 10 to avoid contaminating the valve hall.

[0054] In this embodiment, the optical fiber includes a bottom main optical fiber groove 11 with optical fibers and an interlayer optical fiber groove 12 with optical fibers.

[0055] It should be noted that after the power submodules 19 are connected in series, there is a layer of electrical insulation clearance between 48 power submodules 19 between the two rows of towers. The bottom total cooling water pipe 9, interlayer cooling water pipe 10, bottom total optical fiber groove 11, and interlayer optical fiber groove 12 are arranged between the two rows of towers, and the electrical insulation clearance between the two rows of towers is reasonably utilized to reduce the footprint of the entire valve tower. Among them, a row of towers is composed of a power component and a support unit.

[0056] The technical solution of the present invention provides a valve tower for ultra-high voltage flexible direct current transmission converter valves, which can accommodate up to 240 power sub-modules, and can realize the arrangement of a valve tower for a single bridge arm under high voltage level and high power capacity requirements; by reasonably arranging the number of valve sections on each floor of the valve tower and the number of power sub-modules contained in the valve sections, making full use of the height of the valve tower, and adopting a method of sharing supporting insulators between valve sections, the length and width of the valve tower can be reduced; the first-layer valve sections are directly supported on the bottom support insulators, wherein two bottom support insulators are shared between adjacent valve sections on the first floor, and two interlayer support insulators are shared between adjacent valve sections on other floors, thereby reducing the number of bottom support insulators and interlayer support insulators used, eliminating the need for additional steel platforms and supporting insulators between the steel platforms and the valve sections, effectively reducing the height of the center of gravity of the valve tower and the weight of the valve tower, weakening the adverse effects of the height of the valve tower on earthquake resistance, being beneficial to the earthquake resistance of the valve tower, and also reducing costs. The length, width and height of the valve tower are 12.7m×5.85m×13.8m. The height of the valve tower is conducive to the design of the valve hall, and the length and width occupy a small area, which reduces the construction cost of the valve hall and the valve hall. All valve sections in the valve tower and the power sub-modules in the valve section are in series structure, wherein the valve sections and the power sub-modules in each column and layer of the valve tower are arranged on the same side facing the outside of the valve tower, and are connected by connecting the sub-busbars and the busbars between the valve sections. The valve sections are connected along the shortest path through the straight busbars and the oblique busbars between the columns and the layers, respectively. The busbars in the entire valve tower are arranged along the outside of the valve tower in a spiral rise, which greatly reduces the length of the busbar connection path, reduces the line noise in the valve tower, and reduces the busbar cost; in addition, the infrared temperature detection instruments and cameras in the flexible straight valve hall are usually arranged on the walls around the valve hall, and the valve tower connecting busbars are arranged on the outside of the valve tower, which is also conducive to the infrared temperature monitoring instruments and cameras to detect the temperature of the valve tower busbar connection and the operation of the sub-module head in real time, which is convenient for the operation and maintenance management of the on-site personnel.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims of the present invention.

Claims

1. A flexible DC power transmission converter valve tower, characterized in that: The valve tower comprises: a bottom insulating support, two rows of power components symmetrically arranged on the bottom insulating support, a voltage-equalizing shielding mechanism surrounding the two rows of power components, and a cooling water pipeline and an optical fiber connected to the power components; The two rows of power components are connected with insulation intervals, the power components include layer units connected with multiple layers of insulation intervals, the layer units include multiple valve sections (4), and all the valve sections (4) of the two rows of power components are connected by a busbar along the outer peripheral side of the valve tower to form a spiral electrical primary series connection.

2. A flexible DC transmission converter valve tower according to claim 1, characterized in that: The connecting busbars include an inter-valve section busbar (16), a valve tower straight busbar (14) and a valve tower inclined busbar (13); Two adjacent valve sections (4) in the layer unit are connected in series via the inter-valve section busbar (16); Two valve sections (4) located at the same end in two layer units located at the same layer are connected in series via the valve tower straight busbar (14); The valve sections (4) located in two adjacent layers and arranged obliquely and away from the two ends of the valve tower straight busbar (14) are connected in series through the valve tower oblique busbar (13).

3. The flexible DC transmission converter valve tower according to claim 2, characterized in that: The valve section (4) comprises a bracket and a plurality of power sub-modules (19) arranged on the bracket. The plurality of power sub-modules (19) of each valve section (4) are connected in series via a plurality of connecting sub-busbars (15). The plurality of connecting sub-busbars (15) are arranged along the outer side of the valve tower. The connecting sub-busbars (15) located at both ends of the plurality of connecting sub-busbars (15) of each valve section (4) are connected to the inter-valve section busbar (16), the valve tower straight busbar (14) or the valve tower inclined busbar (13).

4. The flexible DC transmission converter valve tower according to claim 1, characterized in that: The number of layers of the layer unit is 4-6.

5. The flexible DC transmission converter valve tower according to claim 1, characterized in that: The two columns of power components are connected in an insulated manner via a plurality of inter-column inclined insulators (17).

6. The flexible DC transmission converter valve tower according to claim 1, characterized in that: Two adjacent layer units are connected by insulating intervals through multiple groups of interlayer support insulators (3), and the multiple groups of interlayer support insulators (3) are arranged at both ends of the layer unit and between two adjacent valve sections (4) in the layer unit.

7. The flexible DC transmission converter valve tower according to claim 6, characterized in that: Adjacent interlayer support insulators (3) are connected via valve section inclined insulators (18).

8. The flexible DC transmission converter valve tower according to claim 3, characterized in that: The bracket comprises two metal side beams (20) and an insulating beam (21) connected between the two metal side beams (20), and a plurality of power submodules (19) are arranged on the insulating beam (21).

9. The flexible DC transmission converter valve tower according to claim 8, characterized in that: The voltage-equalizing shielding mechanism comprises a bottom voltage-equalizing ring assembly (5), an interlayer shielding cover assembly (6) and a top voltage-equalizing ring assembly (7) surrounding the two columns of power components; the bottom voltage-equalizing ring assembly (5) and the interlayer shielding cover assembly (6) are fixed on a metal side beam (19) of the valve section (4); and the top voltage-equalizing ring assembly (7) is supported above the layer unit located at the top layer through an interlayer support insulator (3).

10. The flexible DC transmission converter valve tower according to claim 1, characterized in that: The bottom insulating support comprises two support units corresponding to the two columns of power components, the support unit comprises a plurality of bottom support insulators (1) and a bottom inclined insulator (2) connecting two adjacent bottom support insulators (1), and the layer unit located at the bottom layer is arranged on top of the plurality of bottom support insulators (1).

11. The flexible DC transmission converter valve tower according to claim 1, characterized in that: The bottom main cooling water pipe (9) of the cooling water pipeline, the interlayer cooling water pipe (10) and the optical fiber are arranged between the two rows of power components.

Images