Converter valve hall

Abstract

The application provides a converter valve hall, which comprises at least one 12-pulse uncontrollable valve group, the 12-pulse uncontrollable valve group comprises a plurality of uncontrollable valve towers, and the uncontrollable valve tower is in a suspension structure; at least one 12-pulse additional controllable blocking valve group, the 12-pulse additional controllable blocking valve group comprises a plurality of additional controllable blocking valve towers, the additional controllable blocking valve tower is independently suspended beside a corresponding uncontrollable valve tower or is fixed on the corresponding uncontrollable valve tower by using a structural member; at least one 12-pulse uncontrollable transfer valve group, the 12-pulse uncontrollable transfer valve group comprises a plurality of uncontrollable transfer valve towers, the uncontrollable transfer valve tower is in a support structure and is electrically connected to a three-phase alternating current incoming line input end of the converter valve hall; and at least one 12-pulse centralized blocking valve group, the 12-pulse centralized blocking valve group comprises at least one centralized blocking valve tower, and the centralized blocking valve tower is in a support structure. According to some embodiments, the overall cost of the converter is reduced, and the workload of operation and maintenance is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, in particular to a converter valve hall. BACKGROUND

[0002] Conventional high-voltage direct current (HVDC) transmission is increasingly widely used at home and abroad due to its long transmission distance, large energy transmission, high reliability and low cost. The HVDC converter valve is a key device for energy conversion, and the conventional HVDC converter valve is based on half-controlled thyristors.

[0003] Although the direct current technology is becoming mature, some problems of the direct current technology are found in the rapid development. When the receiving end is connected to a weak alternating current (AC) system, the AC system voltage disturbance is prone to cause commutation failure, especially in the case of a large number of direct current close-in feed-in in the vicinity of the receiving end, which seriously affects the stability of the receiving end power grid.

[0004] To solve these problems, full-controlled semiconductor devices need to be introduced into the direct current converter, but the full-controlled semiconductor devices have three disadvantages compared with the half-controlled devices:

[0005] First, the power capacity of a single full-controlled semiconductor device is lower than that of a half-controlled device, so more semiconductor devices are needed to form a converter of the same capacity.

[0006] Second, the full-controlled semiconductor devices are more expensive than the half-controlled devices, so the more full-controlled semiconductor devices are used, the higher the overall cost of the converter.

[0007] Third, the failure rate of a single full-controlled semiconductor device is higher than that of a half-controlled device, so the fewer full-controlled semiconductor devices are used, the higher the overall reliability of the converter and the less the workload of operation and maintenance.

[0008] The inventors of the present application found that when the existing direct current project receiving end converter valve is modified, how to retain the original uncontrollable converter valve while adding low-cost controllable blocking valve groups to make it a new type of converter valve with commutation failure suppression function is a problem to be solved. SUMMARY

[0009] The present application aims to provide a converter valve hall to solve the problem of how to retain the original uncontrollable converter valve while adding low-cost controllable blocking valve groups to make it a new type of converter valve with commutation failure suppression function when the existing direct current project receiving end converter valve is modified.

[0010] According to an aspect of the present application, a converter valve hall is provided, comprising: at least one 12-pulse uncontrollable valve group, the 12-pulse uncontrollable valve group comprising a plurality of uncontrollable valve towers, and the uncontrollable valve towers being in a suspension structure; at least one 12-pulse additional controllable blocking valve group, the 12-pulse additional controllable blocking valve group comprising a plurality of additional controllable blocking valve towers, the additional controllable blocking valve towers being individually suspended beside corresponding uncontrollable valve towers or being fixed on the corresponding uncontrollable valve towers by structural members; at least one 12-pulse uncontrollable transfer valve group, the 12-pulse uncontrollable transfer valve group comprising a plurality of uncontrollable transfer valve towers, the uncontrollable transfer valve towers being in a support structure and being electrically connected to a three-phase AC input terminal of the converter valve hall; and at least one 12-pulse centralized blocking valve group, the 12-pulse centralized blocking valve group comprising at least one centralized blocking valve tower, the centralized blocking valve tower being in a support structure and being electrically connected to the at least one 12-pulse uncontrollable transfer valve group, a DC bus of the converter valve hall and an auxiliary DC bus; wherein the uncontrollable valve towers comprise uncontrollable quadruple valve towers, the uncontrollable quadruple valve towers comprising a plurality of uncontrollable converter bridge arms; or the uncontrollable valve towers comprise uncontrollable double valve towers, the uncontrollable double valve towers comprising a plurality of uncontrollable converter bridge arms.

[0011] In some embodiments, the additional controllable blocking valve tower comprises an additional controllable blocking quadruple valve tower, the additional controllable blocking quadruple valve tower comprising a plurality of additional controllable blocking bridge arms, and the number of the additional controllable blocking bridge arms comprised by the additional controllable blocking quadruple valve tower is the same as the number of the uncontrollable converter bridge arms comprised by the uncontrollable quadruple valve tower; or the additional controllable blocking valve tower comprises an additional controllable blocking double valve tower, the additional controllable blocking double valve tower comprising a plurality of additional controllable blocking bridge arms, and the number of the additional controllable blocking bridge arms comprised by the additional controllable blocking double valve tower is the same as the number of the uncontrollable converter bridge arms comprised by the uncontrollable double valve tower.

[0012] In some embodiments, the uncontrollable transfer valve tower comprises an uncontrollable transfer quadruple valve tower, the uncontrollable transfer quadruple valve tower comprising a plurality of uncontrollable transfer converter bridge arms; or the uncontrollable transfer valve tower comprises an uncontrollable transfer double valve tower, the uncontrollable transfer double valve tower comprising a plurality of uncontrollable transfer converter bridge arms.

[0013] In some embodiments, the centralized blocking valve tower comprises a centralized blocking quadruple valve tower, the centralized blocking quadruple valve tower comprising a plurality of centralized blocking bridge arms; or the centralized blocking valve tower comprises a centralized blocking double valve tower, the centralized blocking double valve tower comprising a plurality of centralized blocking bridge arms.

[0014] In some embodiments, the converter valve hall further comprises a plurality of AC line inputs, wherein: the AC line inputs are respectively connected to the midpoints of the upper two converter bridge arms and the lower two converter bridge arms of the additional controllably blocked four-valve tower; or the AC line inputs are respectively connected to the midpoints of the additional controllably blocked two-valve tower group.

[0015] In some embodiments, the DC bus comprises a first DC bus and / or a second DC bus, and the auxiliary DC bus comprises a first auxiliary DC bus, a second auxiliary DC bus, a third auxiliary DC bus, a fourth auxiliary DC bus, and / or a fifth auxiliary DC bus, wherein: the first DC bus is connected to the high-voltage end of the 12-pulse uncontrollable valve group, serving as a high-voltage output end of the converter valve hall; the second DC bus is connected to the low-voltage end of the 12-pulse uncontrollable valve group, serving as a low-voltage output end of the converter valve hall; the first auxiliary DC bus is connected to the neutral point of the 12-pulse uncontrollable valve group; the second auxiliary DC bus is connected to the high-voltage end of the 12-pulse uncontrollable transfer valve group; the third auxiliary DC bus is connected to the first neutral point of the 12-pulse uncontrollable transfer valve group; the fourth auxiliary DC bus is connected to the second neutral point of the 12-pulse uncontrollable transfer valve group; and / or the fifth auxiliary DC bus is connected to the low-voltage end of the 12-pulse uncontrollable transfer valve group.

[0016] In some embodiments, the 12-pulse concentrated blocking valve group comprises: a first concentrated blocking bridge arm, one end of which is connected to the first DC bus, and the other end of which is connected to the second auxiliary DC bus; a second concentrated blocking bridge arm, one end of which is connected to the third auxiliary DC bus; a third concentrated blocking bridge arm, one end of which is connected to the other end of the second concentrated blocking bridge arm, and the other end of which is connected to the fourth auxiliary DC bus, and the connection point of the second concentrated blocking bridge arm and the third concentrated blocking bridge arm is connected to the first auxiliary DC bus; and / or a fourth concentrated blocking bridge arm, one end of which is connected to the fifth auxiliary DC bus, and the other end of which is connected to the second DC bus.

[0017] In some embodiments, any one of the uncontrollable converter bridge arms and uncontrollable transfer converter bridge arms comprises: at least one level of non-controllably blocking power semiconductor devices; or at least one level of non-blocking power semiconductor devices connected in parallel or in series with at least one level of non-controllably blocking power semiconductors.

[0018] In some embodiments, any one of the additional controllably blocking bridge arms or the concentrated controllably blocking bridge arms comprises: at least one level of controllably blocking power semiconductor devices; or at least one level of controllably blocking power semiconductor devices connected with at least one level of non-controllably blocking power semiconductors.

[0019] In some embodiments, the power semiconductor device with controllable turn-off capability is connected in parallel with an overvoltage energy limiting device, wherein the overvoltage energy limiting device is a metal oxide zinc arrester.

[0020] In some embodiments, the power semiconductor device with controllable turn-off capability includes any one of IGBT, IGCT or a combination circuit based on IGBT and IGCT; and / or the non-controllable turn-off power semiconductor includes a diode, a thyristor or a combination of diode and thyristor.

[0021] In some embodiments, the non-controllable valve tower is suspended from the top of the valve hall by a suspension insulator.

[0022] In some embodiments, the non-controllable transfer valve tower is arranged on the ground of the valve hall by a support insulator.

[0023] In some embodiments, the centralized turn-off valve tower is arranged on the ground of the valve hall by a support insulator.

[0024] According to the embodiments of the present application, under the premise of retaining the original non-controllable valve group and sharing the centralized turn-off fully controllable converter bridge arm, the use amount of fully controllable semiconductor devices is maximally reduced, the overall cost of the converter is reduced, and the reliability is improved, thereby reducing the workload of operation and maintenance.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. The above and other objects, features and advantages of the present application will become more apparent through the detailed description of the example embodiments with reference to the drawings.

[0027] Figure 1 A schematic diagram of a 12-pulse converter hall employing four non-controllable converter valves is shown.

[0028] Figure 2 A schematic diagram of a 12-pulse converter hall employing two non-controllable converter valves is shown.

[0029] Figure 3 A device block diagram of a converter hall according to an example embodiment of the present application is shown.

[0030] Figure 4 A retrofit embodiment schematic diagram of a 12-pulse converter hall realizing controllable turn-off based on retaining the original four non-controllable converter valves according to an example embodiment of the present application is shown.

[0031] Figure 5 A retrofit embodiment of a 12-pulse converter hall realized on the basis of a conventional two-pulse uncontrolled converter valve according to an example embodiment of the present application is shown.

[0032] Figure 6 An embodiment of an uncontrolled bridge arm or uncontrolled transfer bridge arm according to an example embodiment of the present application is shown.

[0033] Figure 7 An embodiment of an additional controllable turn-off bridge arm or centralized controllable turn-off bridge arm according to an example embodiment of the present application is shown. DETAILED DESCRIPTION

[0034] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of example embodiments to those skilled in the art. In the drawings, like reference numerals refer to like elements throughout the several views, and the repeat use of reference characters in the text indicates a description that can be common to

[0035] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the techniques described can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In some instances, well-known structures, methods, devices, implementations, materials, and operations are not shown or described in detail in order to avoid obscuring aspects of the disclosure.

[0036] The flow diagrams shown in the Figures are merely examples and do not have to include all of the described steps and operations, nor do they have to be performed in the order described. For example, some operations can be performed in parallel, some operations can be omitted, and some operations can be combined or partially combined with other operations, and the order of the operations can be changed depending on the actual situation.

[0037] The terms "first", "second", "third", etc., in the specification and claims of the present application and the above-described drawings are used to distinguish different objects, and are not used to describe a specific order. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product, or device.

[0038] Figure 1A schematic diagram of a 12-pulse converter valve hall employing fourfold uncontrollable converter valves is shown as Figure 1 The converter valve hall shown employs a fourfold valve structure, and the 12-pulse converter valve hall includes 3 uncontrollable fourfold valve towers. Among them, the uncontrollable fourfold valve tower is a suspended structure, and each valve tower contains 4 uncontrollable converter bridge arms (for example, V41 in Figure 1 2 groups of three-phase AC incoming line ends, and a first DC bus, a second DC bus and a first auxiliary DC bus.

[0039] Figure 2 A schematic diagram of a 12-pulse converter valve hall employing twofold uncontrollable converter valves is shown as Figure 2 The converter valve hall shown employs a twofold valve structure, and the 12-pulse converter valve hall includes 6 uncontrollable twofold valve towers. Among them, the uncontrollable twofold valve tower is a suspended structure, and each valve tower contains 2 uncontrollable converter bridge arms (for example, V41 in Figure 2 2 groups of three-phase AC incoming line ends, and a first DC bus, a second DC bus and a first auxiliary DC bus.

[0040] Since Figure 1 and Figure 2 The converter valve hall in and is composed of uncontrollable devices, and does not have the ability to actively shut down, and cannot resist the occurrence of commutation failure.

[0041] According to the embodiments of the present application, the original uncontrollable valve group is retained, and additional controllable shutdown valve groups, uncontrollable transfer valve groups and centralized shutdown valve groups are introduced to construct a new converter valve hall, so that the centralized shutdown full-control converter bridge arm is realized under the premise of retaining the original uncontrollable valve group, even in the case of commutation failure, the use amount of full-control semiconductor devices is reduced to the greatest extent, the overall cost of the converter is reduced, the reliability is improved, and the workload of operation and maintenance is reduced.

[0042] The specific embodiments according to the present application will be described in detail below with reference to the accompanying drawings.

[0043] Figure 3 A device block diagram of a converter valve hall according to an example embodiment of the present application is shown as Figure 3 The converter valve hall includes at least one 12-pulse uncontrollable valve group 301, at least one 12-pulse additional controllable shutdown valve group 303, at least one 12-pulse uncontrollable transfer valve group 305 and at least one 12-pulse centralized shutdown valve group 307.

[0044] According to the embodiments of the present application, the 12-pulse uncontrollable valve group 301 comprises a plurality of uncontrollable valve towers, and the uncontrollable valve towers are in a suspended structure; the 12-pulse additional controllable blocking valve group 303 comprises a plurality of additional controllable blocking valve towers, the additional controllable blocking valve towers are individually suspended beside the corresponding uncontrollable valve towers or are fixed on the corresponding uncontrollable valve towers by using structural members; the 12-pulse uncontrollable transfer valve group 305 comprises a plurality of uncontrollable transfer valve towers, the uncontrollable transfer valve towers are in a support structure, and are electrically connected to the three-phase AC input terminals of the converter valve hall; and the 12-pulse centralized blocking valve group 307 comprises at least one centralized blocking valve tower, the centralized blocking valve tower is in a support structure, and is electrically connected to the at least one 12-pulse uncontrollable transfer valve group, the DC bus of the converter valve hall and the auxiliary DC bus.

[0045] In some embodiments, the uncontrollable valve tower comprises an uncontrollable fourfold valve tower, and the uncontrollable fourfold valve tower comprises a plurality of uncontrollable converter bridge arms.

[0046] When the uncontrollable valve tower in the converter valve hall is an uncontrollable fourfold valve tower, in other embodiments, the additional controllable blocking valve tower comprises an additional controllable blocking fourfold valve tower, the additional controllable blocking fourfold valve tower comprises a plurality of additional controllable blocking bridge arms, and the number of the additional controllable blocking bridge arms comprised by the additional controllable blocking fourfold valve tower is the same as the number of the uncontrollable converter bridge arms comprised by the uncontrollable fourfold valve tower.

[0047] When the uncontrollable valve tower in the converter valve hall is an uncontrollable fourfold valve tower, in other embodiments, the uncontrollable transfer valve tower comprises an uncontrollable transfer fourfold valve tower, and the uncontrollable transfer fourfold valve tower comprises a plurality of uncontrollable transfer converter bridge arms.

[0048] When the uncontrollable valve tower in the converter valve hall is an uncontrollable fourfold valve tower, in other embodiments, the centralized blocking valve tower comprises a centralized blocking fourfold valve tower, and the centralized blocking fourfold valve tower comprises a plurality of centralized blocking bridge arms.

[0049] According to other embodiments of the present application, the uncontrollable valve tower comprises an uncontrollable twofold valve tower, and the uncontrollable twofold valve tower comprises a plurality of uncontrollable converter bridge arms.

[0050] When the uncontrollable valve tower in the converter valve hall is an uncontrollable fourfold valve tower, according to the embodiments of the present application, Figure 3 The illustrated converter valve hall further comprises a plurality of AC input terminals. Among them, the AC input terminals are respectively connected to the midpoints of the upper two converter bridge arms and the midpoints of the lower two converter bridge arms in the additional controllable blocking fourfold valve tower.

[0051] When the uncontrollable valve tower in the converter valve hall is an uncontrollable double valve tower, in some embodiments, the additional controllable blocking valve tower includes an additional controllable blocking double valve tower, the additional controllable blocking double valve tower includes a plurality of additional controllable blocking bridge arms, and the number of additional controllable blocking bridge arms included in the additional controllable blocking double valve tower is the same as the number of uncontrollable converter bridge arms included in the uncontrollable double valve tower.

[0052] When the uncontrollable valve tower in the converter valve hall is an uncontrollable double valve tower, in some embodiments, the uncontrollable transfer valve tower includes an uncontrollable transfer double valve tower, and the uncontrollable transfer double valve tower includes a plurality of uncontrollable transfer converter bridge arms.

[0053] When the uncontrollable valve tower in the converter valve hall is an uncontrollable double valve tower, in some embodiments, the centralized blocking valve tower includes a centralized blocking double valve tower, and the centralized blocking double valve tower includes a plurality of centralized blocking bridge arms.

[0054] When the uncontrollable valve tower in the converter valve hall is an uncontrollable double valve tower, according to the embodiments of the present application, Figure 3 As shown, the plurality of AC line inputs are connected to the midpoints of the additional controllable blocking double valve tower groups, respectively.

[0055] According to the embodiments of the present application, the DC bus includes a first DC bus and / or a second DC bus, and the auxiliary DC bus includes a first auxiliary DC bus, a second auxiliary DC bus, a third auxiliary DC bus, a fourth auxiliary DC bus, and / or a fifth auxiliary DC bus. As shown, Figure 3 As shown, the first DC bus is connected to the high-voltage end of the 12-pulse uncontrollable valve group 301 to serve as the high-voltage output end of the converter valve hall; the second DC bus is connected to the low-voltage end of the 12-pulse uncontrollable valve group 301 to serve as the low-voltage output end of the converter valve hall; the first auxiliary DC bus is connected to the neutral point of the 12-pulse uncontrollable valve group 301; the second auxiliary DC bus is connected to the high-voltage end of the 12-pulse uncontrollable transfer valve group 305; the third auxiliary DC bus is connected to the first neutral point of the 12-pulse uncontrollable transfer valve group 305; the fourth auxiliary DC bus is connected to the second neutral point of the 12-pulse uncontrollable transfer valve group 305; and the fifth auxiliary DC bus is connected to the low-voltage end of the 12-pulse uncontrollable transfer valve group 305.

[0056] According to the embodiment of the application, the 12-pulse concentrated shutdown valve group 307 comprises a first concentrated shutdown bridge arm, a second concentrated shutdown bridge arm, a third concentrated shutdown bridge arm, and / or a fourth concentrated shutdown bridge arm. The first concentrated shutdown bridge arm is connected at one end to the first DC bus and at the other end to the second auxiliary DC bus; the second concentrated shutdown bridge arm is connected at one end to the third auxiliary DC bus; the third concentrated shutdown bridge arm is connected at one end to the other end of the second concentrated shutdown bridge arm and at the other end to the fourth auxiliary DC bus, and the connection point of the second concentrated shutdown bridge arm and the third concentrated shutdown bridge arm is connected to the first auxiliary DC bus; and / or the fourth concentrated shutdown bridge arm is connected at one end to the fifth auxiliary DC bus and at the other end to the second DC bus.

[0057] In specific embodiments, the first concentrated shutdown bridge arm and the second concentrated shutdown bridge arm or the third concentrated shutdown bridge arm and the fourth concentrated shutdown bridge arm respectively constitute a concentrated shutdown double valve tower.

[0058] In other embodiments, the first concentrated shutdown bridge arm, the second concentrated shutdown bridge arm, the third concentrated shutdown bridge arm, and the fourth concentrated shutdown bridge arm constitute a concentrated shutdown quadruple valve tower.

[0059] According to the embodiment of the application, the 12-pulse concentrated shutdown valve group 307 comprises a first concentrated shutdown bridge arm, a second concentrated shutdown bridge arm, a third concentrated shutdown bridge arm, and / or a fourth concentrated shutdown bridge arm. The first concentrated shutdown bridge arm is connected at one end to the first DC bus and at the other end to the second auxiliary DC bus; the second concentrated shutdown bridge arm is connected at one end to the third auxiliary DC bus; the third concentrated shutdown bridge arm is connected at one end to the other end of the second concentrated shutdown bridge arm and at the other end to the fourth auxiliary DC bus, and the connection point of the second concentrated shutdown bridge arm and the third concentrated shutdown bridge arm is connected to the first auxiliary DC bus; and / or the fourth concentrated shutdown bridge arm is connected at one end to the fifth auxiliary DC bus and at the other end to the second DC bus. Figure 3 As shown in the embodiment, under the premise of retaining the original uncontrollable valve group and sharing the concentrated shutdown full-control type converter bridge arm to completely solve the commutation failure problem, the use amount of full-control type semiconductor devices is maximally reduced, the overall cost of the converter is reduced, and the reliability is improved, thereby reducing the workload of operation and maintenance.

[0060] According to one of the embodiments of the present application, the at least one 12-pulse uncontrollable valve group comprises three uncontrollable four-valve towers, each of which is a suspension structure and comprises four uncontrollable converter arms; the at least one 12-pulse additional controllable blocking valve group comprises three additional controllable blocking four-valve towers, each of which comprises the same number of additional controllable blocking arms as the corresponding uncontrollable valve tower, and each of the additional controllable blocking valve towers is suspended beside the corresponding uncontrollable valve tower or fixed on the corresponding uncontrollable valve tower by a structural member; the at least one 12-pulse uncontrollable transfer valve group comprises three uncontrollable transfer four-valve towers, each of which is a support structure and comprises four uncontrollable transfer converter arms; and the at least one 12-pulse centralized blocking valve group comprises one centralized blocking four-valve tower, which is a support structure and comprises four centralized blocking arms. In this embodiment, the converter valve hall further comprises a first DC bus, a second DC bus, a first auxiliary DC bus, a second auxiliary DC bus, a third auxiliary DC bus, a fourth auxiliary DC bus and a fifth auxiliary DC bus. The first DC bus is connected to the high-voltage end of the 12-pulse uncontrollable valve group and serves as the high-voltage output end of the converter valve hall; the second DC bus is connected to the low-voltage end of the 12-pulse uncontrollable valve group and serves as the low-voltage output end of the converter valve hall; the first auxiliary DC bus is connected to the neutral point of the 12-pulse uncontrollable valve group; the second auxiliary DC bus is connected to the high-voltage end of the 12-pulse uncontrollable transfer valve group; the third auxiliary DC bus is connected to the first neutral point of the 12-pulse uncontrollable transfer valve group; the fourth auxiliary DC bus is connected to the second neutral point of the 12-pulse uncontrollable transfer valve group; and the fifth auxiliary DC bus is connected to the low-voltage end of the 12-pulse uncontrollable transfer valve group. In other embodiments, the converter valve hall further comprises at least six AC line input ends, each of which is connected to the midpoints of the upper two converter arms and the midpoints of the lower two converter arms of each of the three additional controllable blocking four-valve tower groups, i.e., the midpoints of the upper two converter arms and the midpoints of the lower two converter arms of each of the three uncontrollable transfer four-valve towers are connected to the corresponding AC line input ends. In other embodiments, the 12-pulse centralized blocking valve group comprises a first centralized blocking arm, a second centralized blocking arm, a third centralized blocking arm and a fourth centralized blocking arm, which are used to form the blocking four-valve tower.In specific embodiments, one end of the first concentrated turn-off bridge arm is connected to the first DC bus, and the other end is connected to the second auxiliary DC bus; one end of the second concentrated turn-off bridge arm is connected to the third auxiliary DC bus, and the other end is connected to one end of the third concentrated turn-off bridge arm, and the connection point of the second concentrated turn-off bridge arm and the third concentrated turn-off bridge arm is connected to the first auxiliary DC bus; the other end of the third concentrated turn-off bridge arm is connected to the fourth auxiliary DC bus; one end of the fourth concentrated turn-off bridge arm is connected to the fifth auxiliary DC bus, and the other end is connected to the second DC bus.

[0061] Figure 4 A retrofit embodiment diagram of a 12-pulse converter hall realized by retaining the original four-pulse uncontrollable converter valve and realizing controllable turn-off is shown.

[0062] As shown in Figure 4 , the original four-pulse valve towers (for example, A-phase uncontrollable valve tower, B-phase uncontrollable valve tower, and C-phase uncontrollable valve tower) are retained, and three additional controllable turn-off four-pulse valve towers (for example, A-phase additional controllable valve tower, B-phase additional controllable valve tower, and C-phase additional controllable valve tower) are added. Among them, each additional controllable turn-off valve tower includes the same number of additional controllable turn-off bridge arms (for example, V42) as the corresponding uncontrollable valve tower, and each additional controllable turn-off valve tower is separately suspended beside the corresponding uncontrollable valve tower or fixed on each uncontrollable valve tower by a structural member.

[0063] In Figure 4 the embodiment shown, three uncontrollable transfer four-pulse valve towers (for example, A-phase uncontrollable transfer valve tower, B-phase uncontrollable transfer valve tower, and C-phase uncontrollable transfer valve tower) are added, and the uncontrollable transfer four-pulse valve tower is a support structure, and each uncontrollable transfer valve tower includes four uncontrollable transfer converter bridge arms (for example, V43);

[0064] In Figure 4 the embodiment shown, one concentrated turn-off four-pulse valve tower is also added, and the concentrated turn-off four-pulse valve tower is a support structure, and includes four concentrated turn-off bridge arms (for example, V71);

[0065] In Figure 4 the embodiment shown, a second auxiliary DC bus is also added, which is connected to the high-voltage end of the 12-pulse uncontrollable transfer valve group; a third auxiliary DC bus is added, which is connected to the first neutral point of the 12-pulse uncontrollable transfer valve group; a fourth auxiliary DC bus is added, which is connected to the second neutral point of the 12-pulse uncontrollable transfer valve group; and a fifth auxiliary DC bus is added, which is connected to the low-voltage end of the 12-pulse uncontrollable transfer valve group.

[0066] According to another specific embodiment of the present application, the at least one 12-pulse uncontrollable valve group comprises 6 uncontrollable double valve towers, and each uncontrollable double valve tower is a suspended structure, and comprises 2 uncontrollable converter arms; the at least one 12-pulse additional controllable blocking valve group comprises 6 additional controllable blocking double valve towers, and each additional controllable blocking valve tower comprises the same number of additional controllable blocking arms as the uncontrollable valve tower, and the additional controllable blocking valve tower is suspended beside the corresponding uncontrollable valve tower or is fixed on the corresponding uncontrollable valve tower by a structural member; the at least one 12-pulse uncontrollable transfer valve group comprises 6 uncontrollable transfer double valve towers, and each uncontrollable transfer double valve tower comprises 2 uncontrollable transfer converter arms, and the uncontrollable transfer four valve tower comprises 4 uncontrollable transfer converter arms; the at least one 12-pulse centralized blocking valve group comprises 2 centralized blocking double valve towers, and each centralized blocking double valve tower comprises 2 centralized blocking arms, and the centralized blocking four valve tower comprises 4 centralized blocking arms. In this embodiment, the converter valve hall further comprises a first DC bus, a second DC bus, a first auxiliary DC bus, a second auxiliary DC bus, a third auxiliary DC bus, a fourth auxiliary DC bus and a fifth auxiliary DC bus. The first DC bus is connected to the high-voltage end of the 12-pulse uncontrollable valve group, and is a high-voltage output end of the converter valve hall; the second DC bus is connected to the low-voltage end of the 12-pulse uncontrollable valve group, and is a low-voltage output end of the converter valve hall; the first auxiliary DC bus is connected to the neutral point of the 12-pulse uncontrollable valve group; the second auxiliary DC bus is connected to the high-voltage end of the 12-pulse uncontrollable transfer valve group; the third auxiliary DC bus is connected to the first neutral point of the 12-pulse uncontrollable transfer valve group; the fourth auxiliary DC bus is connected to the second neutral point of the 12-pulse uncontrollable transfer valve group; and the fifth auxiliary DC bus is connected to the low-voltage end of the 12-pulse uncontrollable transfer valve group.

[0067] In other embodiments, the converter valve hall further comprises at least 6 AC line input ends, wherein each AC line input end is connected to the midpoint of the 6 additional controllable blocking double valve towers, and the midpoint of the uncontrollable transfer double valve tower is connected to the corresponding AC line input end.

[0068] In some embodiments, the 12-pulse concentrated blocking valve group includes a first concentrated blocking bridge arm and a second concentrated blocking bridge arm, for example, with the first concentrated blocking bridge arm and the second concentrated blocking bridge arm constituting a concentrated blocking double valve tower. In specific embodiments, one end of the first concentrated blocking bridge arm is connected to the first DC bus, and the other end is connected to the second auxiliary DC bus; one end of the second concentrated blocking bridge arm is connected to the third auxiliary DC bus, and the other end is connected to one end of the third concentrated blocking bridge arm, and the connection point of the second concentrated blocking bridge arm and the third concentrated blocking bridge arm is connected to the first auxiliary DC bus.

[0069] Figure 5 A retrofit embodiment schematic diagram of a 12-pulse converter valve hall realized by retaining the original double uncontrolled converter valve and implementing controllable blocking is shown according to an example embodiment of the present application.

[0070] As shown in Figure 5 , the original double valve tower is retained, and six additional controllable blocking double valve towers (for example, an A-phase uncontrolled valve tower, a B-phase uncontrolled valve tower, and a C-phase uncontrolled valve tower) are added, and the additional controllable blocking valve towers include the same number of additional controllable blocking bridge arms (for example, V42) as the uncontrolled valve tower, and each additional controllable blocking valve tower is separately suspended beside the corresponding uncontrolled valve tower or fixed on the corresponding uncontrolled valve tower using structural members.

[0071] In the embodiment shown in Figure 5 , six uncontrolled transfer double valve towers (for example, an A-phase uncontrolled transfer valve tower, a B-phase uncontrolled transfer valve tower, and a C-phase uncontrolled transfer valve tower) are added, and the uncontrolled transfer double valve towers are support type structures including two uncontrolled transfer converter bridge arms (for example, V43).

[0072] In the embodiment shown in Figure 5 , two concentrated blocking double valve towers are added, and the concentrated blocking double valve towers are support type structures, each including two concentrated blocking bridge arms (for example, V71).

[0073] In the embodiment shown in Figure 5 , a second auxiliary DC bus is also added, connected to the high-voltage end of the 12-pulse uncontrolled transfer valve group; a third auxiliary DC bus is added, connected to the first neutral point of the 12-pulse uncontrolled transfer valve group; a fourth auxiliary DC bus is added, connected to the second neutral point of the 12-pulse uncontrolled transfer valve group; and a fifth auxiliary DC bus is added, connected to the low-voltage end of the 12-pulse uncontrolled transfer valve group.

[0074] According to embodiments of the present application, any of the uncontrolled converter bridge arm and the uncontrolled transfer converter bridge arm comprises at least one non-controllable turn-off capable power semiconductor device; or at least one non-turn-off capable power semiconductor device connected in parallel or series with at least one non-controllable turn-off power semiconductor. The non-controllable turn-off power semiconductor comprises a diode, a thyristor, or a combination of a diode and a thyristor.

[0075] Figure 6 An embodiment schematic diagram of an uncontrolled bridge arm or an uncontrolled transfer bridge arm according to example embodiments of the present application is shown.

[0076] As shown in Figure 6 embodiment a, the uncontrolled converter bridge arm is composed of at least one non-controllable turn-off capable diode connected in parallel or series; in embodiment b, the uncontrolled converter bridge arm is composed of at least one non-controllable turn-off capable thyristor connected in parallel or series; in embodiment c, the uncontrolled converter bridge arm is composed of at least one non-controllable turn-off capable thyristor connected in series with at least one non-controllable turn-off power semiconductor diode, and then at least one set of thyristor and diode components are connected in parallel.

[0077] According to embodiments of the present application, any of the additional controllable turn-off bridge arm or the centralized controllable turn-off bridge arm comprises at least one controllable turn-off capable power semiconductor device; or at least one controllable turn-off capable power semiconductor device connected in parallel or series with at least one non-controllable turn-off power semiconductor. In some embodiments, the controllable turn-off capable power semiconductor device is connected in parallel with an overvoltage energy limiting device, wherein the overvoltage energy limiting device is a metal oxide arrester.

[0078] In practice, the controllable turn-off capable power semiconductor device comprises any one of an IGBT, an IGCT, or a combination circuit based on an IGBT and an IGCT.

[0079] Figure 7 An embodiment schematic diagram of an additional controllable turn-off bridge arm or a centralized controllable turn-off bridge arm according to example embodiments of the present application is shown.

[0080] As shown in Figure 7 embodiment a, the controllable turn-off bridge arm is composed of at least one controllable turn-off capable IGBT connected in parallel or series.

[0081] In embodiment b, the controllable turn-off bridge arm is composed of at least one controllable turn-off capable IGCT connected in parallel or series.

[0082] In embodiment c, the controllable turn-off bridge arm is composed of at least one controllable turn-off capable IGBT connected in series with at least one non-controllable turn-off power semiconductor diode, and then at least one set of IGBT and diode components are connected in parallel.

[0083] The controllable turn-off bridge arm in embodiment d is composed of at least one controllably turn-off IGCT and at least one non-controllably turn-off power semiconductor diode in series, and at least one set of IGCT and diode components in parallel.

[0084] The controllable turn-off bridge arm in embodiment e is composed of at least one controllably turn-off IGBT and at least one non-controllably turn-off power semiconductor thyristor in series, and at least one set of IGBT and thyristor components in parallel.

[0085] The controllable turn-off bridge arm in embodiment f is composed of at least one controllably turn-off IGCT and at least one non-controllably turn-off power semiconductor thyristor in series, and at least one set of IGCT and thyristor components in parallel.

[0086] The controllable turn-off bridge arm in embodiment g is composed of at least one controllably turn-off IGBT, at least one non-controllably turn-off power semiconductor thyristor, and at least one non-controllably turn-off power semiconductor diode in series, and at least one set of IGBT, thyristor and diode components in parallel.

[0087] The controllable turn-off bridge arm in embodiment h has two ends, at least one non-controllably turn-off power semiconductor thyristor at one end is the first output end of the controllable turn-off bridge arm, at least one non-controllably turn-off power semiconductor thyristor at the other end, at least one controllably turn-off IGBT at one end is connected to at least one non-controllably turn-off power semiconductor thyristor at one end, at least one controllably turn-off IGBT at the other end is connected to at least one non-controllably turn-off power semiconductor diode at one end, and at least one non-controllably turn-off power semiconductor diode at the other end is connected to at least one non-controllably turn-off power semiconductor thyristor at the other end to form the second output end of the controllable turn-off bridge arm.

[0088] The controllable turn-off bridge arm in embodiment i has two ends, at least one non-controllably turn-off power semiconductor thyristor at one end is the first output end of the controllable turn-off bridge arm, at least one non-controllably turn-off power semiconductor thyristor at the other end, at least one controllably turn-off IGCT at one end is connected to at least one non-controllably turn-off power semiconductor thyristor at one end, at least one controllably turn-off IGCT at the other end is connected to at least one non-controllably turn-off power semiconductor diode at one end, and at least one non-controllably turn-off power semiconductor diode at the other end is connected to at least one non-controllably turn-off power semiconductor thyristor at the other end to form the second output end of the controllable turn-off bridge arm.

[0089] The controllable turn-off bridge arm in embodiment j has two ends, one end of the at least one non-controllably turn-off power semiconductor thyristor is the first output end of the controllable turn-off bridge arm, the other end of the at least one non-controllably turn-off power semiconductor thyristor, one end of the overvoltage energy limiting unit and one end of the at least one IGBT with controllable turn-off capability are connected with one end of the at least one non-controllably turn-off power semiconductor thyristor, the other end of the at least one IGBT with controllable turn-off capability and the other end of the overvoltage energy limiting unit are connected with one end of the at least one non-controllably turn-off power semiconductor diode, and the other end of the at least one non-controllably turn-off power semiconductor diode is connected with the other end of the at least one non-controllably turn-off power semiconductor thyristor to form the second output end of the controllable turn-off bridge arm.

[0090] The controllable turn-off bridge arm in embodiment k has two ends, one end of the at least one non-controllably turn-off power semiconductor thyristor is the first output end of the controllable turn-off bridge arm, the other end of the at least one non-controllably turn-off power semiconductor thyristor, one end of the overvoltage energy limiting unit and one end of the at least one IGCT with controllable turn-off capability are connected with one end of the at least one non-controllably turn-off power semiconductor thyristor, the other end of the at least one IGCT with controllable turn-off capability and the other end of the overvoltage energy limiting unit are connected with one end of the at least one non-controllably turn-off power semiconductor diode, and the other end of the at least one non-controllably turn-off power semiconductor diode is connected with the other end of the at least one non-controllably turn-off power semiconductor thyristor to form the second output end of the controllable turn-off bridge arm.

[0091] The controllable turn-off bridge arm in embodiment l has two ends, one end of the at least one IGBT with controllable turn-off capability is connected with one end of the capacitor, and the other end of the at least one IGBT with controllable turn-off capability is connected with one end of the at least one IGBT with controllable turn-off capability to form the first output end of the controllable turn-off bridge arm, and the other end of the at least one IGBT with controllable turn-off capability is connected with the other end of the capacitor to form the second output end of the controllable turn-off bridge arm.

[0092] According to some embodiments of the present application, the non-controllable valve tower (including a non-controllable double valve tower or a non-controllable quadruple valve tower) is suspended on the top of the valve hall by a suspension insulator.

[0093] According to some other embodiments of the present application, the non-controllable transfer valve tower (including a non-controllable transfer double valve tower or a non-controllable transfer quadruple valve tower) is arranged on the ground of the valve hall by a support insulator.

[0094] In some other embodiments, the centralized turn-off valve tower (including a centralized turn-off double valve tower or a centralized turn-off quadruple valve tower) is arranged on the ground of the valve hall by a support insulator.

[0095] The above has carried out the detailed introduction to the embodiment of the application, the principle and implementation mode of the application have been described by applying specific examples in this paper, the above embodiment description is only used for helping understanding the method of the application and its core idea. At the same time, the changes or deformations made by the person skilled in the art on the basis of the specific implementation mode and the application range of the application according to the idea of the application all belong to the protection scope of the application. In summary, the content of the specification should not be understood as the limitation of the application.

Claims

1. A converter valve hall, characterized in that Comprise: at least one 12-pulse uncontrollable valve group, the 12-pulse uncontrollable valve group comprising a plurality of uncontrollable valve towers, and the uncontrollable valve towers being suspended structures; at least one 12-pulse additional controllable blocking valve group, the 12-pulse additional controllable blocking valve group comprising a plurality of additional controllable blocking valve towers, the additional controllable blocking valve towers being independently suspended beside corresponding uncontrollable valve towers or being fixed on corresponding uncontrollable valve towers by structural members; at least one 12-pulse uncontrollable transfer valve group, the 12-pulse uncontrollable transfer valve group comprising a plurality of uncontrollable transfer valve towers, the uncontrollable transfer valve towers being support structures and being electrically connected to three-phase AC input terminals of the converter valve hall; and at least one 12-pulse centralized blocking valve group, the 12-pulse centralized blocking valve group comprising at least one centralized blocking valve tower, the centralized blocking valve tower being a support structure and being electrically connected to the at least one 12-pulse uncontrollable transfer valve group, a DC bus of the converter valve hall, and an auxiliary DC bus; wherein the converter valve hall further comprises a plurality of AC input terminals, and the AC input terminals are respectively connected to midpoints of the additional controllable blocking four-valve towers; the DC bus comprises a first DC bus and a second DC bus, the auxiliary DC bus comprises a first auxiliary DC bus, a second auxiliary DC bus, a third auxiliary DC bus, a fourth auxiliary DC bus, and a fifth auxiliary DC bus, and: the first DC bus is connected to a high-voltage end of the 12-pulse uncontrollable valve group to serve as a high-voltage output terminal of the converter valve hall; the second DC bus is connected to a low-voltage end of the 12-pulse uncontrollable valve group to serve as a low-voltage output terminal of the converter valve hall; the first auxiliary DC bus is connected to a neutral point of the 12-pulse uncontrollable valve group; the second auxiliary DC bus is connected to a high-voltage end of the 12-pulse uncontrollable transfer valve group; the third auxiliary DC bus is connected to a first neutral point of the 12-pulse uncontrollable transfer valve group; the fourth auxiliary DC bus is connected to a second neutral point of the 12-pulse uncontrollable transfer valve group; the fifth auxiliary DC bus is connected to a low-voltage end of the 12-pulse uncontrollable transfer valve group; the uncontrollable valve tower comprises an uncontrollable four-valve tower, the uncontrollable four-valve tower comprising a first uncontrollable converter bridge arm, a second uncontrollable converter bridge arm, a third uncontrollable converter bridge arm, and a fourth uncontrollable converter bridge arm, the additional controllable blocking valve tower comprises an additional controllable blocking four-valve tower, the additional controllable blocking four-valve tower comprising a first additional controllable blocking bridge arm, a second additional controllable blocking bridge arm, a third additional controllable blocking bridge arm, and a fourth additional controllable blocking bridge arm, the uncontrollable transfer valve tower comprises a first uncontrollable transfer bridge arm, a second uncontrollable transfer bridge arm, a third uncontrollable transfer bridge arm, and a fourth uncontrollable transfer bridge arm, and the centralized blocking valve tower comprises a centralized blocking four-valve tower, the centralized blocking four-valve tower comprising a first centralized blocking bridge arm, a second centralized blocking bridge arm, a third centralized blocking bridge arm, and a fourth centralized blocking bridge arm; one end of the first uncontrollable converter bridge arm is connected to the first DC bus, and the other end of the first uncontrollable converter bridge arm is connected to one end of the first additional controllable blocking bridge arm, one end of the second additional controllable turn-off bridge arm is connected to one end of the second uncontrollable commutation bridge arm, and the other end of the second uncontrollable commutation bridge arm is connected to one end of the third uncontrollable commutation bridge arm, one end of the second uncontrollable commutation bridge arm is connected to one end of the second additional controllable turn-off bridge arm, and the other end of the second uncontrollable commutation bridge arm is connected to one end of the third uncontrollable commutation bridge arm, one end of the third uncontrollable commutation bridge arm is connected to one end of the third additional controllable turn-off bridge arm, and the other end of the third uncontrollable commutation bridge arm is connected to one end of the fourth uncontrollable commutation bridge arm, one end of the third additional controllable turn-off bridge arm is connected to one end of the fourth additional controllable turn-off bridge arm, and the other end of the fourth additional controllable turn-off bridge arm is connected to one end of the fourth uncontrollable commutation bridge arm, one end of the first concentrated turn-off bridge arm is connected to the first DC bus, and the other end of the first concentrated turn-off bridge arm is connected to one end of the first uncontrollable transfer bridge arm through the second auxiliary DC bus, one end of the second concentrated turn-off bridge arm is connected to the other end of the second uncontrollable transfer bridge arm through the third auxiliary DC bus, and the other end of the second concentrated turn-off bridge arm is connected to one end of the third concentrated turn-off bridge arm, the other end of the third concentrated turn-off bridge arm is connected to the fourth auxiliary DC bus, one end of the third uncontrollable transfer bridge arm is connected to the fourth auxiliary DC bus, and the other end of the third uncontrollable transfer bridge arm is connected to one end of the fourth uncontrollable transfer bridge arm and simultaneously connected to the AC input terminal of the corresponding phase, 2. The converter hall according to claim 1, characterized in that the other end of the fourth uncontrollable transfer bridge arm is connected to one end of the fourth concentrated turn-off bridge arm and the fifth auxiliary DC bus, and the other end of the fourth concentrated turn-off bridge arm is connected to the second DC bus.

3. A converter valve hall, characterized in that The number of additional controllable turn-off bridge arms included in the additional controllable turn-off quadruple valve tower is the same as the number of uncontrollable commutation bridge arms included in the uncontrollable quadruple valve tower. comprise: at least one 12-pulse uncontrollable valve group, the 12-pulse uncontrollable valve group comprising a plurality of uncontrollable valve towers, and the uncontrollable valve towers being in a suspension structure; at least one 12-pulse additional controllable turn-off valve group, the 12-pulse additional controllable turn-off valve group comprising a plurality of additional controllable turn-off valve towers, the additional controllable turn-off valve towers being independently suspended beside corresponding uncontrollable valve towers or being fixed on the corresponding uncontrollable valve towers by structural members; at least one 12-pulse uncontrollable transfer valve group, the 12-pulse uncontrollable transfer valve group comprising a plurality of uncontrollable transfer valve towers, the uncontrollable transfer valve towers being in a support structure and being electrically connected to the three-phase AC input terminal of the converter valve hall; and at least one 12-pulse concentrated turn-off valve group, the 12-pulse concentrated turn-off valve group comprising at least one concentrated turn-off valve tower, the concentrated turn-off valve tower being in a support structure and being electrically connected to the at least one 12-pulse uncontrollable transfer valve group, the DC bus and the auxiliary DC bus of the converter valve hall. The uncontrolled valve tower includes a first uncontrolled double valve tower and a second uncontrolled double valve tower, the first uncontrolled double valve tower includes a first uncontrolled converter bridge arm and a second uncontrolled converter bridge arm, and the second uncontrolled double valve tower includes a third uncontrolled converter bridge arm and a fourth uncontrolled converter bridge arm; The additional controllable blocking valve tower includes an additional controllable blocking double valve tower, and the additional controllable blocking double valve tower includes a first additional controllable blocking bridge arm and a second additional controllable blocking bridge arm, a third additional controllable blocking bridge arm and a fourth additional controllable blocking bridge arm, The uncontrolled transfer valve tower includes a first uncontrolled transfer bridge arm and a second uncontrolled transfer bridge arm, a third additional controllable blocking bridge arm and a fourth additional controllable blocking bridge arm, The centralized blocking valve tower includes a first centralized blocking bridge arm, a second centralized blocking bridge arm, a third centralized blocking bridge arm and a fourth centralized blocking bridge arm; The converter valve hall further includes a plurality of AC line input ends, and the AC line input ends are respectively connected to the midpoints of the additional controllable blocking double valve tower groups; The DC bus includes a first DC bus and a second DC bus, and the auxiliary DC bus includes a first auxiliary DC bus, a second auxiliary DC bus, a third auxiliary DC bus, a fourth auxiliary DC bus and a fifth auxiliary DC bus, wherein The first DC bus is connected to the high-voltage end of the 12-pulse uncontrolled valve group to serve as a high-voltage output end of the converter valve hall; The second DC bus is connected to the low-voltage end of the 12-pulse uncontrolled valve group to serve as a low-voltage output end of the converter valve hall; The first auxiliary DC bus is connected to the neutral point of the 12-pulse uncontrolled valve group; The second auxiliary DC bus is connected to the high-voltage end of the 12-pulse uncontrolled transfer valve group; The third auxiliary DC bus is connected to the first neutral point of the 12-pulse uncontrolled transfer valve group; The fourth auxiliary DC bus is connected to the second neutral point of the 12-pulse uncontrolled transfer valve group; The fifth auxiliary DC bus is connected to the low-voltage end of the 12-pulse uncontrolled transfer valve group; One end of the first uncontrolled converter bridge arm is connected to the first DC bus, and the other end is connected to one end of the first additional controllable blocking bridge arm, The other end of the first additional controllable blocking bridge arm is connected to one end of the second additional controllable blocking bridge arm, and the other end of the second additional controllable blocking bridge arm is connected to one end of the second uncontrolled converter bridge arm, The other end of the second uncontrolled converter bridge arm is connected to the first auxiliary DC bus; One end of the first centralized blocking bridge arm is connected to the first DC bus, and the other end is connected to one end of the first uncontrolled transfer bridge arm through the second auxiliary DC bus, and the connection midpoint of the first uncontrolled transfer bridge arm and the second uncontrolled transfer bridge arm is connected to the AC line input end of the corresponding phase; One end of the second centralized blocking bridge arm is connected to the other end of the second uncontrolled transfer bridge arm through the third auxiliary DC bus, and the other end is connected to the first auxiliary DC bus; One end of the third uncontrolled converter bridge arm is connected to the first auxiliary DC bus, and the other end is connected to one end of the third additional controllable blocking bridge arm, one end of the third additional controllable turn-off bridge arm is connected to one end of the fourth additional controllable turn-off bridge arm, and the other end of the fourth additional controllable turn-off bridge arm is connected to one end of the fourth uncontrollable converter bridge arm, the other end of the fourth uncontrollable converter bridge arm is connected to the second DC bus; one end of the third centralized turn-off bridge arm is connected to the first auxiliary DC bus, and the other end of the third centralized turn-off bridge arm is connected to one end of the third uncontrollable transfer bridge arm through the fourth auxiliary DC bus, and the connection midpoint of the third uncontrollable transfer bridge arm and the fourth uncontrollable transfer bridge arm is connected to the AC line input end of the corresponding phase; one end of the fourth centralized turn-off bridge arm is connected to the other end of the fourth uncontrollable transfer bridge arm through the fifth auxiliary DC bus, and the other end of the fourth centralized turn-off bridge arm is connected to the second DC bus.

4. The converter hall according to claim 3, characterized in that: the number of additional controllable turn-off bridge arms included in the additional controllable turn-off double valve tower is the same as the number of uncontrollable converter bridge arms included in the uncontrollable double valve tower.

5. The converter hall according to claim 3, characterized in that any one of the first uncontrollable converter bridge arm, the second uncontrollable converter bridge arm, the first uncontrollable transfer bridge arm and the second uncontrollable transfer bridge arm comprises: at least one non-controllable turn-off power semiconductor device; or at least one non-controllable turn-off power semiconductor and at least one non-controllable turn-off power semiconductor connected in parallel or in series.

6. The converter hall according to claim 3, characterized in that any one of the first additional controllable turn-off bridge arm, the second additional controllable turn-off bridge arm, the first centralized turn-off bridge arm and the second centralized turn-off bridge arm comprises: at least one controllable turn-off power semiconductor device; or at least one controllable turn-off power semiconductor device and at least one non-controllable turn-off power semiconductor connected in parallel or in series.

7. The converter hall according to claim 6, characterized in that The controllable turn-off power semiconductor device is connected in parallel with an overvoltage energy limiting device, wherein the overvoltage energy limiting device is a metal oxide zinc arrester.

8. The converter hall according to claim 6 or 7, characterized in that The controllable turn-off power semiconductor device comprises any one of an IGBT, an IGCT or a combination circuit based on an IGBT and an IGCT; and / or The non-controllable turn-off power semiconductor comprises a diode, a thyristor or a combination of a diode and a thyristor.

9. The converter hall according to claim 3, characterized in that The uncontrollable valve tower is suspended from the top of the valve hall by a suspension insulator.

10. The converter hall according to claim 3, characterized in that The uncontrollable transfer valve tower is arranged on the ground of the valve hall by a support insulator.

11. The converter hall according to claim 3, characterized in that The centralized turn-off valve tower is arranged on the ground of the valve hall by a support insulator.

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