CN117424427A - Four valve tower structures of flexible direct current transmission compact converter valve - Google Patents

Four valve tower structures of flexible direct current transmission compact converter valve Download PDF

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Publication number
CN117424427A
CN117424427A CN202311378285.8A CN202311378285A CN117424427A CN 117424427 A CN117424427 A CN 117424427A CN 202311378285 A CN202311378285 A CN 202311378285A CN 117424427 A CN117424427 A CN 117424427A
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CN
China
Prior art keywords
valve
power module
group
direct current
current transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311378285.8A
Other languages
Chinese (zh)
Inventor
褚明娟
陈刚
李庆宇
易荣
鲁挺
张海涛
岳伟
余琼
杨旭
钱宝利
滕海
吴丹青
李欣璐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rongxin Huike Electric Co ltd
Original Assignee
Rongxin Huike Electric Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rongxin Huike Electric Co ltd filed Critical Rongxin Huike Electric Co ltd
Priority to CN202311378285.8A priority Critical patent/CN117424427A/en
Publication of CN117424427A publication Critical patent/CN117424427A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0204—Mounting supporting structures on the outside of casings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0247—Electrical details of casings, e.g. terminals, passages for cables or wiring
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures

Abstract

The invention provides a four-column valve tower structure of a compact converter valve for flexible direct current transmission, which relates to the technical field of flexible direct current transmission systems and comprises four power module columns, wherein each power module column is of an upper-lower multilayer structure, each layer is provided with a plurality of valve sections, and each valve section is provided with a plurality of power modules; every two power module rows are arranged back to form a group, a set of supporting frames are shared, and the two valve groups are combined into a converter valve four-row valve tower structure; a tray frame is shared between adjacent valve sections of the same layer of two power module rows in each valve group, the tray frame is a valve section group, a plurality of valve section groups of the same layer form a valve layer, the power modules of each valve section group are connected in series through a busbar, and the series connection form is a Z-shaped electric connection loop. The invention can reduce the size and weight of the converter valve, reasonably exert the structural performance, save the resources and improve the transmission capacity and the power transmission density of the converter valve.

Description

Four valve tower structures of flexible direct current transmission compact converter valve
Technical Field
The invention relates to the technical field of flexible direct current transmission systems, in particular to a four-column valve tower structure of a flexible direct current transmission compact converter valve.
Background
In recent years, the high-voltage direct-current transmission technology of China is vigorously developed, and high-voltage and high-current direct-current projects are continuously increased. The flexible direct current transmission is important equipment for constructing the intelligent power grid, has strong technical advantages in the aspects of island power supply, distribution network transformation, asynchronous interconnection, large-scale electric field grid connection and the like, and is strategic choice for changing the development pattern of the power grid. Along with the improvement of voltage class of flexible direct current transmission engineering, the increase of transmission capacity, the development demands in the fields of offshore softness and straightness and the like, the optimization of equipment volume and weight is also facing new challenges, and especially for offshore platforms in open sea, the requirements on the compactness and the light weight of the converter valve are higher and higher.
At present, the valve towers of the traditional flexible direct current transmission converter valves all adopt structural forms of double-row support, module series connection, valve section series connection and valve layer series connection. Each valve tower of the structure consists of two rows, each row of valve towers is supported by two groups of large-diameter post insulators, and a large potential difference exists between the two rows of valve towers, so that a certain air gap is generally required to be designed, or a maintenance channel for operation and maintenance is designed. For the situations of limited land occupation of an urban center, an offshore platform and the like, if the traditional design is still adopted, the double-row support and module serial valve tower structure can not be met gradually.
Disclosure of Invention
In order to solve the technical problems in the background technology, the invention provides a four-column valve tower structure of a flexible direct current transmission compact converter valve, which reduces the size and weight of the converter valve, reasonably exerts the structural performance, saves the resources and improves the transmission capacity and the power transmission density of the converter valve.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a four-column valve tower structure of a flexible direct current transmission compact converter valve comprises four power module columns, wherein each power module column is of an upper-lower multilayer structure, each layer is provided with a plurality of valve sections, and each valve section is provided with a plurality of power modules; every two power module rows are arranged back to form a group, a set of supporting frames are shared, and the two valve groups are combined into a converter valve four-row valve tower structure; the back-to-back arrangement means that the rear ends, i.e. the non-maintenance sides, of the power modules of the power module row are located on the inner side, and the front ends, i.e. the maintenance sides, of the power modules are all located on the outer side.
A tray frame is shared between adjacent valve sections of the same layer of two power module columns in each valve group, the tray frame is a valve section group, a plurality of valve section groups of the same layer form a valve layer, the power modules of each valve section group are connected in series through a busbar, and the series form is as follows: the 1 st power module of the 1 st row is connected with the 1 st power module of the 2 nd row, then connected with the 2 nd power module of the 1 st row, then connected with the 2 nd power module … … of the 2 nd row, and so on, namely the Z-shaped electric connection loop.
Further, the connection bus-bars between the power modules of each valve segment group are arranged above and below the power modules.
Further, the utility model also comprises a cooling water pipeline, the cooling water pipeline of each valve section group comprises a branch water pipe arranged below the front end of the power module and a transverse water pipe at the side edge of the tray frame of each valve section group, the branch water pipes of the power module are converged and connected to the transverse water pipes, and each transverse water pipe is converged and connected to the main water pipe.
Further, the optical fiber module comprises optical fibers for communication connection of the power modules, the optical fibers of each power module are firstly gathered into a transverse optical fiber groove at the side edge of the tray frame of each valve section group and then gathered into a total optical fiber groove at one side of the valve tower, and the transverse optical fiber groove is positioned at the front lower part of each row of power modules.
Further, each two power module rows are a valve group, a set of supporting frames is shared, each supporting frame is composed of a set of supporting insulators, four power module rows are supported by two sets of supporting insulators, each set of supporting insulators is matched with a diagonal insulator, and each two sets of supporting insulators are matched with a diagonal insulator.
Further, adjacent power modules between two valve groups are arranged face to face, an overhaul platform is arranged between the two valve groups, and the power modules arranged face to face are replaced and maintained on the overhaul platform.
Further, the valve tower cooling water pipeline also comprises a cooling water pipeline, and the main water pipes of the valve tower cooling water pipeline are arranged on two sides or the same side of the support frame.
Further, the main water pipes are four groups or two groups, and each group is a water inlet pipe and a water outlet pipe.
Further, the valve tower support comprises two groups of voltage-sharing shielding devices of four power module rows, the voltage-sharing shielding devices are arranged on the periphery of the valve tower support frame, and a ring type or plate type or ring plate combination mode is adopted.
Compared with the prior art, the invention has the beneficial effects that:
1) The two rows of power modules are formed into the valve group, and the zigzag through flow adopted in the valve group reduces the air gap between the two rows of modules, so that the size of a valve layer is reduced;
2) The two rows of power modules are formed into a valve group, and share one group of supporting insulators, so that the number of the supporting insulators is reduced, and the weight of the valve tower is reduced;
3) The four rows of power modules are formed into a valve tower, the number of the power modules which can be accommodated by the single valve tower is increased, and the number of the single bridge arm valve towers is reduced, so that the occupied area of the converter valve is further reduced;
4) Four power modules, 2 groups of support insulators are formed into a valve tower, and cable-stayed insulators are arranged among the support insulators, so that the structural design is more reasonable, the stability is high, and the earthquake resistance is strong.
Drawings
FIG. 1 is a schematic view of a valve segment set according to the present invention;
FIG. 2 is a schematic diagram of a valve segment set according to the present invention (another view of FIG. 1);
fig. 3 is a schematic view of the overall structure of the valve tower of the present invention.
Wherein: the power module comprises a 1-aluminum frame 2-a power module 3-an insulating I-beam 4-a connecting busbar 5-a valve section water inlet pipe 6-a valve section water outlet pipe 7-a module water inlet pipe 8-a module water outlet pipe 9-a pipe clamp 10-a transverse optical fiber groove 11-a top shielding ring 12-an overhaul channel 13-an interlayer shielding ring 14-a supporting insulator 15-a total cooling water pipe 16-a cable stayed insulator 17-a valve group 18-an interlayer insulator 19-a total optical fiber groove.
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
as shown in fig. 1-3, a four-column valve tower structure of a compact converter valve for flexible direct current transmission comprises four power module columns, wherein each power module column is of a multi-layer structure, each layer is provided with a plurality of valve sections (3 valve sections are arranged on each layer of each power module column in fig. 3), and each valve section is provided with a plurality of power modules 2; every two power module rows are arranged back to form a group, a set of supporting frames are shared, one valve group 17 is formed, and the two valve groups 17 are combined into a converter valve four-row valve tower structure; an overhaul channel 12 is arranged between the two valve groups 17 to form an anti-seismic stable structure of the four-row support type converter valve tower. The back-to-back arrangement means that the rear ends, i.e. the non-maintenance sides, of the power modules 2 of the power module row are located on the inner side, and the front ends, i.e. the maintenance sides, of the power modules 2 are all located on the outer side. The maintenance side is provided with an electric input and output connecting end and a connecting end of the water cooling pipe.
A tray frame is shared between adjacent valve segments of the same layer of two power module columns in each valve group 17 (in this embodiment, the tray frame is formed by connecting an aluminum frame 1 and an insulating i-beam 3, the power modules 2 are supported by 6 insulating i-beams 3, two ends of the insulating i-beams 3 are connected with the aluminum frame 1), so that one valve segment group is formed, and a plurality of valve segment groups of the same layer form one valve layer, as shown in fig. 1-2, and a valve segment group structure schematic diagram is shown. As shown in fig. 3, the valve groups 17 have the same number of valve layers, each having 4 valve layers, and each layer has 3 valve segment groups. In the embodiment of the valve segment group structure shown in fig. 1-2, two valve segments of two power module rows form a valve segment group, the number of the two rows of power modules 2 in each valve segment group is the same, and 7 power modules 2 are arranged in each valve segment. Intermediate the two valve blocks 17 is a service channel 12. The valve towers of the four-row support type converter valves are of anti-seismic stable structures.
As shown in fig. 3, in this embodiment, the supporting frame is formed by a group of supporting insulators 14, four power module rows are supported by two groups of supporting insulators 14, a diagonal insulator 16 is matched between each group of supporting insulators 14, a diagonal insulator 16 is matched between the two groups of supporting insulators 14, and an interlayer insulator 18 is further arranged between the two groups of supporting insulators.
As shown in fig. 1-2, the power modules 2 of each valve segment group are connected in series through a connection busbar 4, and the series form is as follows: the layer 1 is connected as follows: the 1 st power module 2 of the 1 st row is connected with the 1 st power module 2 of the 2 nd row, then connected with the 2 nd power module 2 of the 1 st row, and then connected with the 2 nd power module 2 … … of the 2 nd row, and the like, namely a Z-shaped electric connection loop.
The electrical series connection form between the multiple valve layers of the two valve banks is a spiral connection form, and the connection of the multiple valve layers of the left valve bank and the right valve bank in fig. 3 is specifically: after the connection of the 1 st layer is completed by the left valve bank, the 1 st layer power module 2 of the right valve bank is connected, the 2 nd layer power module 2 … … of the left valve bank is connected, and so on.
Further, as shown in fig. 1-2, in the valve segment group of the present embodiment, the connection busbar 4 between the power modules 2 is arranged above and below the power modules 2, and the connection busbar 4 between the multiple valve layers of the two valve groups is arranged at a position between the two valve segments 17, so that maintenance is facilitated.
Further, the cooling water pipeline of each valve segment group comprises branch water pipes (comprising a module water inlet pipe 7 and a module water outlet pipe 8) arranged below the front end of the power module 2 and transverse water pipes (comprising a valve segment water inlet pipe 5 and a valve segment water outlet pipe 6) at the side edge of the tray frame of each valve segment group, the branch water pipes of the power module 2 of each valve segment group are connected to the transverse water pipes in a converging way, and the transverse water pipes are connected to a main water pipe (a total cooling water pipe 15) in a converging way. As shown in fig. 3, in this embodiment, the total cooling water pipes 15 of the valve tower cooling water pipeline are disposed at two sides or the same side of the support frame, and the total cooling water pipes 15 are four groups or two groups, each group is a water inlet pipe and a water outlet pipe.
Further, the system further comprises optical fibers for communication connection of the power modules 2 and the main control system, wherein the optical fibers of each power module 2 are firstly gathered into a transverse optical fiber groove 10 at the side edge of the tray frame of each valve section group and then gathered into a total optical fiber groove 19 at one side of the valve tower, and the transverse optical fiber grooves 10 are positioned at the front lower part of each row of power modules 2.
Further, adjacent power modules 2 between two valve groups 17 are arranged face to face, an overhaul platform is arranged between the two valve groups 17, and the power modules 2 arranged face to face are replaced and maintained on the overhaul platform.
Further, the valve tower support comprises a voltage-sharing shielding device, the voltage-sharing shielding device comprises a top shielding ring 11 and an interlayer shielding ring 13, the number of the voltage-sharing shielding devices of four power module rows is two, the voltage-sharing shielding devices are arranged on the periphery of the valve tower support frame, and a ring type or plate type or ring plate combination mode is adopted.
Referring to fig. 3, in the anti-seismic stable structure of the four-column support type converter valve tower of the embodiment, the bottom of each multi-layer valve group 17 is structurally supported and fixed by adopting 4-point support insulators 14, the support insulators 14 are of integral pultrusion type solid structures, the support insulators 14 are connected with each other through cable-stayed insulators 16, stress conduction is realized by connecting the support insulators 14 with each other through the cable-stayed insulators 16, and the integrity is higher, so that the anti-seismic performance of the valve tower is improved. The bottom 16 supporting insulators 14 support the lowest valve layer, the interlayer insulators 18 support the rest 3 valve layers and the top shielding ring 11, and the periphery of the valve tower adopts a full-ring shielding structure 13.
In this embodiment, a main fiber groove 19 is designed on one side of the valve tower, 2 groups are all arranged, and the fibers of each power module 2 are gathered into a transverse fiber groove 10 of the valve layer, and each layer of transverse fiber groove is connected with the main fiber groove 19. The valve tower main cooling water pipe 15 is designed on the other side, and 2 groups are arranged, wherein each group comprises a water inlet pipe and a water outlet pipe, and 2 paths are arranged.
In this embodiment, the branch water pipes (the module water inlet pipe 7 and the module water outlet pipe 8) of the power module 2 are connected in parallel to each layer of transverse water pipes (including the valve section water inlet pipe 5 and the valve section water outlet pipe 6), and the layers of transverse water pipes are connected in a converging manner to form a total cooling water pipe 15.
The four-column support type converter valve tower is of an anti-seismic stable structure, every two columns of the four-column valve tower structure are in one group, the four groups are arranged back to back, the compactness degree is high, the two groups are subjected to valve tower operation and maintenance through the overhaul channel 12, and the two outer columns are subjected to lifting platform vehicle operation and maintenance.
The four-column support type converter valve tower is of an anti-seismic stable structure, and the valve section water inlet pipe 5, the valve section water outlet pipe 6, the module water inlet pipe 7, the module water outlet pipe 8 and the optical fiber groove 10 are designed below the front of each power module column, so that the operation is convenient.
In the above embodiments, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the azimuth or positional relationship based on the azimuth or positional relationship shown in the drawings. These terms are used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims (9)

1. The four-column valve tower structure of the flexible direct current transmission compact converter valve is characterized by comprising four power module columns, wherein each power module column is of an upper-lower multilayer structure, each layer is provided with a plurality of valve sections, and each valve section is provided with a plurality of power modules; every two power module rows are arranged back to form a group, a set of supporting frames are shared, and the two valve groups are combined into a converter valve four-row valve tower structure; the back-to-back arrangement means that the rear ends, namely the non-maintenance sides, of the power modules of the power module row are positioned on the inner side, and the front ends, namely the maintenance sides, of the power modules are positioned on the outer side;
a tray frame is shared between adjacent valve sections of the same layer of two power module columns in each valve group, the tray frame is a valve section group, a plurality of valve section groups of the same layer form a valve layer, the power modules of each valve section group are connected in series through a busbar, and the series form is as follows: the 1 st power module of the 1 st row is connected with the 1 st power module of the 2 nd row, then connected with the 2 nd power module of the 1 st row, then connected with the 2 nd power module … … of the 2 nd row, and so on, namely the Z-shaped electric connection loop.
2. The four-column valve tower structure of a compact converter valve for flexible direct current transmission according to claim 1, wherein the connection bus between the power modules of each valve segment group is arranged above and below the power modules.
3. The four-column valve tower structure of a compact converter valve for flexible direct current transmission according to claim 1, further comprising a cooling water pipeline, wherein the cooling water pipeline of each valve segment group comprises a branch water pipe arranged below the front end of the power module and a transverse water pipe at the side edge of the tray frame of each valve segment group, the branch water pipes of the power module are converged and connected to the transverse water pipes, and the transverse water pipes are converged and connected to the main water pipe.
4. The four-column valve tower structure of the compact converter valve for the flexible direct current transmission according to claim 1, further comprising optical fibers for communication connection of power modules, wherein the optical fibers of each power module are collected into a transverse optical fiber groove at the side edge of a tray frame of each valve section group and then collected into a total optical fiber groove at one side of the valve tower, and the transverse optical fiber groove is positioned at the front lower part of each column of power modules.
5. The four-column valve tower structure of the compact converter valve for the flexible direct current transmission according to claim 1, wherein each two power module columns are a valve group, a supporting frame is shared, the supporting frame is composed of a group of supporting insulators, the four power module columns are supported by two groups of supporting insulators, each group of supporting insulators is matched with a diagonal insulator, and the two groups of supporting insulators are matched with a diagonal insulator.
6. The four-column valve tower structure of the compact converter valve for the flexible direct current transmission according to claim 1, wherein adjacent power modules between two valve groups are arranged face to face, an overhaul platform is arranged between the two valve groups, and the power modules arranged face to face are replaced and maintained on the overhaul platform.
7. The four-column valve tower structure of the compact converter valve for the flexible direct current transmission according to claim 1, further comprising a cooling water pipeline, wherein main water pipes of the valve tower cooling water pipeline are arranged on two sides or the same side of the support frame.
8. The four-column valve tower structure of the compact converter valve for the flexible direct current transmission according to claim 7, wherein the main water pipes are four groups or two groups, and each group is a water inlet pipe and a water outlet pipe.
9. The four-column valve tower structure of the compact converter valve for the flexible direct current transmission according to claim 1, further comprising voltage-sharing shielding devices, wherein the number of the voltage-sharing shielding devices of the four power module columns is two, the voltage-sharing shielding devices are arranged on the periphery of the valve tower support frame, and a ring type or plate type or ring plate combination mode is adopted.
CN202311378285.8A 2023-10-24 2023-10-24 Four valve tower structures of flexible direct current transmission compact converter valve Pending CN117424427A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311378285.8A CN117424427A (en) 2023-10-24 2023-10-24 Four valve tower structures of flexible direct current transmission compact converter valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311378285.8A CN117424427A (en) 2023-10-24 2023-10-24 Four valve tower structures of flexible direct current transmission compact converter valve

Publications (1)

Publication Number Publication Date
CN117424427A true CN117424427A (en) 2024-01-19

Family

ID=89532014

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311378285.8A Pending CN117424427A (en) 2023-10-24 2023-10-24 Four valve tower structures of flexible direct current transmission compact converter valve

Country Status (1)

Country Link
CN (1) CN117424427A (en)

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