Converter valve hall

Abstract

The invention provides a converter valve hall which comprises at least one 12-pulsation uncontrollable valve group, the 12-pulsation uncontrollable valve group comprises a plurality of uncontrollable valve towers, and the uncontrollable valve towers are of suspension structures; the at least one 12-pulsation additional controllable shut-off valve group comprises a plurality of additional controllable shut-off valve towers, and the additional controllable shut-off valve towers are independently suspended beside the corresponding uncontrollable valve towers or are fixed on the corresponding uncontrollable valve towers by adopting structural members; the at least one 12-pulse uncontrollable transfer valve group comprises a plurality of uncontrollable transfer valve towers, and the uncontrollable transfer valve towers are of a supporting type structure and are electrically connected to the three-phase alternating current inlet wire input end of the converter valve hall; and the 12-pulse centralized shut-off valve group comprises at least one centralized shut-off valve tower, and the centralized shut-off valve tower is of a supporting type 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 field of power electronics technology, and in particular to a converter valve hall. Background Art

[0002] Conventional high-voltage direct current transmission has been increasingly widely used at home and abroad due to its long transmission distance, large transmission energy, high reliability and low cost. Among them, the high-voltage direct current converter valve is the key equipment to achieve energy conversion. The conventional high-voltage direct current transmission converter valve is based on a semi-controlled thyristor.

[0003] Although DC technology is becoming more mature, some problems with DC technology have been found in its rapid development. When the receiving end is connected to a weak AC system, commutation failure is prone to occur when the AC system voltage is disturbed, especially when a large amount of DC is fed into the receiving end in a short distance, which seriously affects the stability of the receiving end power grid.

[0004] To solve these problems, it is necessary to introduce fully controlled semiconductor devices into DC converters. However, fully controlled semiconductor devices currently have three disadvantages compared to semi-controlled devices:

[0005] 1. The power capacity of a single fully controlled semiconductor device is lower than that of a semi-controlled device, so more semiconductor devices are needed to form a converter with the same capacity;

[0006] Second, fully controlled semiconductor devices are more expensive than semi-controlled devices. Therefore, the more fully controlled semiconductor devices are used, the more the overall cost of the converter increases.

[0007] 3. The failure rate of a single fully-controlled semiconductor device is higher than that of a semi-controlled device. Therefore, the fewer fully-controlled semiconductor devices are used, the higher the overall reliability of the converter will be and the smaller the workload of operation and maintenance will be.

[0008] The inventors of the present application have discovered that, when modifying the receiving-end converter valve of an existing DC project, how to retain the original uncontrollable converter valve while adding a low-cost controllable shut-off valve group to make it a new type of converter valve with a commutation failure suppression function is a problem that needs to be solved at present. Summary of the invention

[0009] The present application aims to propose a converter valve hall to solve the problem of how to retain the original uncontrollable converter valve while adding a low-cost controllable shut-off valve group when modifying the converter valve at the receiving end of an existing DC project, so that it becomes a new type of converter valve with a commutation failure suppression function.

[0010] According to one aspect of the present application, a converter valve hall is proposed, comprising: at least one 12-pulsation uncontrollable valve group, the 12-pulsation uncontrollable valve group comprising a plurality of uncontrollable valve towers, and the uncontrollable valve tower is a suspended structure; at least one 12-pulsation additional controllable shut-off valve group, the 12-pulsation additional controllable shut-off valve group comprising a plurality of additional controllable shut-off valve towers, the additional controllable shut-off valve towers are suspended separately beside the corresponding uncontrollable valve towers, or are fixed to the corresponding uncontrollable valve towers by structural members; at least one 12-pulsation uncontrollable transfer valve group, the 12-pulsation uncontrollable transfer valve group comprising a plurality of uncontrollable transfer valve towers, the uncontrollable transfer The valve tower is a supporting structure, electrically connected to the three-phase AC incoming line input terminal of the converter valve hall; and at least one 12-pulse centralized shut-off valve group, the 12-pulse centralized shut-off valve group includes at least one centralized shut-off valve tower, the centralized shut-off valve tower is a supporting structure, 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; wherein the uncontrollable valve tower includes an uncontrollable quadruple valve tower, the uncontrollable quadruple valve tower includes multiple uncontrollable converter bridge arms; or the uncontrollable valve tower includes an uncontrollable double valve tower, the uncontrollable double valve tower includes multiple uncontrollable converter bridge arms.

[0011] In some embodiments, the additional controllable shut-off valve tower includes an additional controllable shut-off quadruple valve tower, the additional controllable shut-off quadruple valve tower includes multiple additional controllable shut-off bridge arms, and the number of additional controllable shut-off bridge arms included in the additional controllable shut-off quadruple valve tower is the same as the number of uncontrollable converter bridge arms included in the uncontrollable quadruple valve tower; or the additional controllable shut-off valve tower includes an additional controllable shut-off double valve tower, the additional controllable shut-off double valve tower includes multiple additional controllable shut-off bridge arms, and the number of additional controllable shut-off bridge arms included in the additional controllable shut-off double valve tower is the same as the number of uncontrollable converter bridge arms included in the uncontrollable double valve tower.

[0012] In some embodiments, the uncontrollable transfer valve tower includes an uncontrollable transfer quadruple valve tower, which includes multiple uncontrollable transfer converter bridge arms; or the uncontrollable transfer valve tower includes an uncontrollable transfer double valve tower, which includes multiple uncontrollable transfer converter bridge arms.

[0013] In some embodiments, the centralized shut-off valve tower includes a centralized shut-off quadruple valve tower, which includes multiple centralized shut-off bridge arms; or the centralized shut-off valve tower includes a centralized shut-off double valve tower, which includes multiple centralized shut-off bridge arms.

[0014] In some embodiments, the converter valve hall also includes multiple AC line input terminals, wherein: the AC line input terminals are respectively connected to the midpoints of the two converter bridge arms at the upper end and the midpoints of the two converter valve bridge arms at the lower end of the additional controllable shut-off quadruple valve tower; or the AC line input terminals are respectively connected to the midpoints of the additional controllable shut-off double valve tower group.

[0015] In some embodiments, 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, wherein the first DC bus is connected to the high-voltage end of the 12-pulsation uncontrollable valve group 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-pulsation uncontrollable valve group 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-pulsation uncontrollable valve group; the second auxiliary DC bus is connected to the high-voltage end of the 12-pulsation uncontrollable transfer valve group; the third auxiliary DC bus is connected to the first neutral point of the 12-pulsation uncontrollable transfer valve group; the fourth auxiliary DC bus is connected to the second neutral point of the 12-pulsation uncontrollable transfer valve group; and / or the fifth auxiliary DC bus is connected to the low-voltage end of the 12-pulsation uncontrollable transfer valve group.

[0016] In some embodiments, the 12-pulse centralized shut-off valve group includes: a first centralized shut-off bridge arm, one end of which is connected to the first DC bus, and the other end is connected to the second auxiliary DC bus; a second centralized shut-off bridge arm, one end of which is connected to the third auxiliary DC bus; a third centralized shut-off bridge arm, one end of which is connected to the other end of the second centralized shut-off bridge arm, and the other end of the third centralized shut-off bridge arm is connected to the fourth auxiliary DC bus, and the connection point between the second centralized shut-off bridge arm and the third centralized shut-off bridge arm is connected to the first auxiliary DC bus; and / or a fourth centralized shut-off 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 commutation bridge arm and the uncontrollable transfer commutation bridge arm includes: at least one level of power semiconductor device with non-controllable shutdown capability; or at least one level of power semiconductor device with non-shutdown capability and at least one level of non-controllable shutdown power semiconductor connected in parallel or series.

[0018] In some embodiments, either the additional controllable shutdown bridge arm or the centralized controllable shutdown bridge arm includes: at least one level of power semiconductor devices with controllable shutdown capability; or at least one level of power semiconductor devices with controllable shutdown capability connected to at least one level of uncontrollable shutdown power semiconductors.

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

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

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

[0022] In some embodiments, the uncontrollable transfer valve tower is arranged on the valve hall floor via support insulators.

[0023] In some embodiments, the centralized shut-off valve tower is arranged on the valve hall floor through supporting insulators.

[0024] According to the embodiments of the present application, the use of fully-controlled semiconductor devices is minimized, the overall cost of the converter is reduced, and the reliability is improved, while the workload of operation and maintenance is reduced, while retaining the original uncontrollable valve group and centrally shutting down the shared fully-controlled commutation bridge arm to ensure that the commutation failure problem is completely solved.

[0025] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. By describing the exemplary embodiments in detail with reference to the drawings, the above and other objectives, features and advantages of the present application will become more apparent.

[0027] Figure 1 A schematic diagram of a 12-pulsation converter valve hall using quadruple uncontrollable converter valves is shown.

[0028] Figure 2 A schematic diagram of a 12-pulsation converter valve hall using double uncontrollable converter valves is shown.

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

[0030] Figure 4 A schematic diagram of a modification embodiment of a 12-pulsation converter valve hall that achieves controllable shutdown while retaining the original quadruple uncontrollable converter valves according to an exemplary embodiment of the present application is shown.

[0031] Figure 5 A schematic diagram of a modification embodiment of a 12-pulsation converter valve hall that achieves controllable shutdown while retaining the original double uncontrollable converter valves according to an exemplary embodiment of the present application is shown.

[0032] Figure 6 A schematic diagram of an embodiment of an uncontrollable bridge arm or an uncontrollable transfer bridge arm according to an exemplary embodiment of the present application is shown.

[0033] Figure 7 A schematic diagram of an embodiment of an additional controllable shutdown bridge arm or a centrally controllable shutdown bridge arm according to an exemplary embodiment of the present application is shown. DETAILED DESCRIPTION

[0034] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. In the figures, the same figures show the same or similar parts, and thus their repeated description will be omitted.

[0035] The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of these specific details, or other modes, components, materials, devices or operations may be adopted. In these cases, known structures, methods, devices, implementations, materials or operations will not be shown or described in detail.

[0036] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0037] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. 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 optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0038] Figure 1A schematic diagram of a 12-pulse converter valve hall using quadruple uncontrollable converter valves is shown, Figure 1 The converter valve hall shown in the figure adopts a quadruple valve structure, and the 12-pulse converter valve hall includes three uncontrollable quadruple valve towers. Among them, the uncontrollable quadruple valve tower is a suspended structure, and each valve tower includes four uncontrollable converter bridge arms (for example, Figure 1 V41 in it), two groups of three-phase AC incoming line terminals 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 using double uncontrollable converter valves is shown. Figure 2 The converter valve hall shown in the figure adopts a double valve structure, and the 12-pulsation converter valve hall includes 6 uncontrollable double valve towers. Among them, the uncontrollable double valve tower is a suspended structure, and each valve tower includes 2 uncontrollable converter bridge arms (for example, Figure 2 V41 in it), including 2 groups of three-phase AC incoming line terminals and a first DC bus, a second DC bus and a first auxiliary DC bus.

[0040] because Figure 1 and Figure 2 The converter valve hall is composed of uncontrollable components, which 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 shut-off valve groups, uncontrollable transfer valve groups, and centralized shut-off valve groups are introduced to construct a new converter valve hall. This allows the sharing of centralized shut-off fully-controlled converter bridge arms while retaining the original uncontrollable valve group. Even under the premise of commutation failure, the use of fully-controlled semiconductor devices can be minimized, thereby reducing the overall cost of the converter, improving reliability, and reducing the workload of operation and maintenance.

[0042] The specific embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

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

[0044] According to an embodiment of the present application, a 12-pulsation uncontrollable valve group 301 includes a plurality of uncontrollable valve towers, and the uncontrollable valve towers are suspended structures; a 12-pulsation additional controllable shut-off valve group 303 includes a plurality of additional controllable shut-off valve towers, and the additional controllable shut-off valve towers are suspended separately beside the corresponding uncontrollable valve towers, or are fixed to the corresponding uncontrollable valve towers using structural parts; a 12-pulsation uncontrollable transfer valve group 305 includes a plurality of uncontrollable transfer valve towers, and the uncontrollable transfer valve towers are supporting structures, electrically connected to the three-phase AC incoming line input terminal of the converter valve hall; and a 12-pulsation centralized shut-off valve group 307 includes at least one centralized shut-off valve tower, and the centralized shut-off valve tower is a supporting structure, electrically connected to the at least one 12-pulsation 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 includes an uncontrollable quadruple valve tower, and the uncontrollable quadruple valve tower includes a plurality of uncontrollable converter bridge arms.

[0046] When the uncontrollable valve tower in the converter valve hall is an uncontrollable quadruple valve tower, in other embodiments, the additional controllable shut-off valve tower includes an additional controllable shut-off quadruple valve tower, the additional controllable shut-off quadruple valve tower includes multiple additional controllable shut-off bridge arms, and the number of additional controllable shut-off bridge arms included in the additional controllable shut-off quadruple valve tower is the same as the number of uncontrollable converter bridge arms included in the uncontrollable quadruple valve tower.

[0047] When the uncontrollable valve tower in the converter valve hall is an uncontrollable quadruple valve tower, in other embodiments, the uncontrollable transfer valve tower includes an uncontrollable transfer quadruple valve tower, and the uncontrollable transfer quadruple valve tower includes multiple uncontrollable transfer converter bridge arms.

[0048] When the uncontrollable valve tower in the converter valve hall is an uncontrollable quadruple valve tower, in other embodiments, the centralized shut-off valve tower includes a centralized shut-off quadruple valve tower, and the centralized shut-off quadruple valve tower includes a plurality of centralized shut-off bridge arms.

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

[0050] When the uncontrollable valve tower in the converter valve hall is an uncontrollable quadruple valve tower, according to an embodiment of the present application, Figure 3 The converter valve hall shown in the figure also includes a plurality of AC line input terminals, wherein the AC line input terminals are respectively connected to the midpoints of the two converter bridge arms at the upper end and the midpoints of the two converter valve bridge arms at the lower end of the additional controllable shut-off quadruple 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 shut-off valve tower includes an additional controllable shut-off double valve tower, the additional controllable shut-off double valve tower includes multiple additional controllable shut-off bridge arms, and the number of additional controllable shut-off bridge arms included in the additional controllable shut-off 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 other embodiments, the uncontrollable transfer valve tower includes an uncontrollable transfer double valve tower, and the uncontrollable transfer double valve tower includes multiple uncontrollable transfer converter bridge arms.

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

[0054] When the uncontrollable valve tower in the converter valve hall is an uncontrollable double valve tower, according to an embodiment of the present application, Figure 3 The structure shown also includes a plurality of AC line input terminals, which are respectively connected to the midpoint of the additional controllable shutoff double valve tower group.

[0055] According to an embodiment 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. Figure 3 As shown, the first DC bus is connected to the high-voltage end of the 12-pulsation uncontrolled 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-pulsation uncontrolled 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-pulsation uncontrolled valve group 301; the second auxiliary DC bus is connected to the high-voltage end of the 12-pulsation uncontrolled transfer valve group 305; the third auxiliary DC bus is connected to the first neutral point of the 12-pulsation uncontrolled transfer valve group 305; the fourth auxiliary DC bus is connected to the second neutral point of the 12-pulsation uncontrolled transfer valve group 305; and the fifth auxiliary DC bus is connected to the low-voltage end of the 12-pulsation uncontrolled transfer valve group 305.

[0056] According to an embodiment of the present application, the 12-pulsation centralized shut-off valve group 307 includes a first centralized shut-off bridge arm, a second centralized shut-off bridge arm, a third centralized shut-off bridge arm and / or a fourth centralized shut-off bridge arm. Among them, one end of the first centralized shut-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 centralized shut-off bridge arm is connected to the third auxiliary DC bus; one end of the third centralized shut-off bridge arm is connected to the other end of the second centralized shut-off bridge arm, and the other end of the third centralized shut-off bridge arm is connected to the fourth auxiliary DC bus, and the connection point between the second centralized shut-off bridge arm and the third centralized shut-off bridge arm is connected to the first auxiliary DC bus; and / or one end of the fourth centralized shut-off bridge arm is connected to the fifth auxiliary DC bus, and the other end is connected to the second DC bus.

[0057] In a specific embodiment, the first centralized shutoff bridge arm and the second centralized shutoff bridge arm or the third centralized shutoff bridge arm and the fourth centralized shutoff bridge arm respectively constitute a centralized shutoff double valve tower.

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

[0059] according to Figure 3 The embodiment shown, while retaining the original uncontrollable valve group and centrally shutting down the shared fully-controlled commutation bridge arm, ensures that the commutation failure problem is completely solved, minimizes the use of fully-controlled semiconductor devices, reduces the overall cost of the converter, and improves reliability, thereby reducing the workload of operation and maintenance.

[0060] According to one of the specific embodiments of the present application, at least one 12-pulse uncontrollable valve group includes three uncontrollable quadruple valve towers, and each uncontrollable quadruple valve tower is a suspended structure, and each includes four uncontrollable converter bridge arms; at least one 12-pulse additional controllable shut-off valve group includes three additional controllable shut-off quadruple valve towers, and each additional controllable shut-off valve tower includes additional controllable shut-off bridge arms with the same number of converter bridge arms as the corresponding uncontrollable valve tower, and each additional controllable shut-off valve tower is suspended separately from the corresponding uncontrollable Next to the valve tower, or fixed on the corresponding uncontrollable valve tower by a structural member; at least one 12-pulse uncontrollable transfer valve group includes three uncontrollable transfer quadruple valve towers, and the uncontrollable transfer quadruple valve tower is a supporting structure, and each uncontrollable transfer double valve tower includes four uncontrollable transfer commutation bridge arms; at least one 12-pulse centralized shut-off valve group includes one centralized shut-off quadruple valve tower, and the centralized shut-off quadruple valve tower is a supporting structure, and each centralized shut-off quadruple valve tower includes four centralized shut-off bridge arms. In this embodiment, the commutation valve hall also includes 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. Among them, the first DC bus is connected to the high-voltage end of the 12-pulsation uncontrollable valve group, which is the high-voltage output end of the converter valve hall; the second DC bus is connected to the low-voltage end of the 12-pulsation uncontrollable valve group, which is the low-voltage output end of the converter valve hall; the first auxiliary DC bus is connected to the neutral point of the 12-pulsation uncontrollable valve group; the second auxiliary DC bus is connected to the high-voltage end of the 12-pulsation uncontrollable transfer valve group; the third auxiliary DC bus is connected to the first neutral point of the 12-pulsation uncontrolled transfer valve group; the fourth auxiliary DC bus is connected to the second neutral point of the 12-pulsation uncontrolled transfer valve group; the fifth auxiliary DC bus is connected to the low-voltage end of the 12-pulsation uncontrollable transfer valve group. In other embodiments, the converter valve hall further includes at least 6 AC line input terminals, wherein each AC line input terminal is respectively connected to the midpoint of the upper two converter bridge arms and the midpoint of the lower two converter valve bridge arms of the three additional controllable shut-off quadruple valve tower groups, that is, the midpoint of the upper two converter bridge arms and the midpoint of the lower two converter bridge arms of the three uncontrollable transfer quadruple valve towers are respectively connected to the corresponding AC line input terminals. In other embodiments, the 12-pulse centralized shut-off valve group includes a first centralized shut-off bridge arm, a second centralized shut-off bridge arm, a third centralized shut-off bridge arm, and a fourth centralized shut-off bridge arm. For example, the centralized shut-off bridge arm, the second centralized shut-off bridge arm, the third centralized shut-off bridge arm, and the fourth centralized shut-off bridge arm set constitute a shut-off quadruple valve tower.In a specific embodiment, one end of the first centralized shutdown 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 centralized shutdown bridge arm is connected to the third auxiliary DC bus, and the other end is connected to one end of the third centralized shutdown bridge arm, and the connection point between the second centralized shutdown bridge arm and the third centralized shutdown bridge arm is connected to the first auxiliary DC bus; the other end of the third centralized shutdown bridge arm is connected to the fourth auxiliary DC bus; one end of the fourth centralized shutdown 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 schematic diagram of a modification embodiment of a 12-pulsation converter valve hall that achieves controllable shutdown while retaining the original quadruple uncontrollable converter valves according to an exemplary embodiment of the present application is shown.

[0062] like Figure 4 As shown, the original quadruple valve tower (e.g., uncontrollable valve tower of phase A, uncontrollable valve tower of phase B, and uncontrollable valve tower of phase C) is retained, and three additional controllable shut-off quadruple valve towers (e.g., additional controllable valve tower of phase A, additional controllable valve tower of phase B, and additional controllable valve tower of phase C) are added. Each additional controllable shut-off valve tower includes additional controllable shut-off bridge arms (e.g., V42) having the same number of commutation bridge arms as the corresponding uncontrollable valve tower, and each additional controllable shut-off valve tower is suspended separately beside the corresponding uncontrollable valve tower, or is fixed to each uncontrollable valve tower using a structural member.

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

[0064] exist Figure 4 In the embodiment shown, a centralized shut-off quadruple valve tower is further added, and the centralized shut-off quadruple valve tower is a supporting structure, including four centralized shut-off bridge arms (for example, V71);

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

[0066] According to another specific embodiment of the present application, at least one 12-pulsation uncontrollable valve group includes 6 uncontrollable double valve towers, and each uncontrollable double valve tower is a suspended structure, including 2 uncontrollable converter bridge arms; at least one 12-pulsation additional controllable shut-off valve group includes 6 additional controllable shut-off double valve towers, and each additional controllable shut-off valve tower includes additional controllable shut-off bridge arms with the same number of converter bridge arms as the uncontrollable valve tower, and the additional controllable shut-off valve tower is suspended separately next to the corresponding uncontrollable valve tower, or is fixed to the corresponding uncontrollable valve tower using a structural member; at least One 12-pulse uncontrolled transfer valve group includes 6 uncontrolled transfer double valve towers, and the uncontrolled transfer double valve tower is a supporting structure, each uncontrolled transfer double valve tower includes 2 uncontrolled transfer converter bridge arms, and the uncontrolled transfer quadruple valve tower is a supporting structure, including 4 uncontrolled transfer converter bridge arms; at least one 12-pulse centralized shut-off valve group includes 2 centralized shut-off double valve towers, and the centralized shut-off double valve tower is a supporting structure, and the centralized shut-off quadruple valve tower is a supporting structure, and each of the 2 centralized shut-off bridge arms includes 4 centralized shut-off bridge arms. In this embodiment, the converter valve hall also includes 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. Among them, the first DC bus is connected to the high-voltage end of the 12-pulsation uncontrollable valve group, which is the high-voltage output end of the converter valve hall; the second DC bus is connected to the low-voltage end of the 12-pulsation uncontrollable valve group, which is the low-voltage output end of the converter valve hall; the first auxiliary DC bus is connected to the neutral point of the 12-pulsation uncontrollable valve group; the second auxiliary DC bus is connected to the high-voltage end of the 12-pulsation uncontrollable transfer valve group; the third auxiliary DC bus is connected to the first neutral point of the 12-pulsation uncontrollable transfer valve group; the fourth auxiliary DC bus is connected to the second neutral point of the 12-pulsation uncontrollable transfer valve group; the fifth auxiliary DC bus is connected to the low-voltage end of the 12-pulsation uncontrollable transfer valve group;

[0067] In other embodiments, the converter valve hall also includes at least 6 AC line input terminals, wherein each AC line input terminal is respectively connected to the midpoints of 6 additional controllable shut-off double valve tower groups, that is, the midpoints of the controlled transfer double valve tower groups are respectively connected to the corresponding AC line input terminals.

[0068] In other embodiments, the 12-pulse centralized shutoff valve group includes a first centralized shutoff bridge arm and a second centralized shutoff bridge arm. For example, in other embodiments, the 12-pulse centralized shutoff valve group includes a first centralized shutoff bridge arm and a second centralized shutoff bridge arm to form a centralized shutoff double valve tower. In a specific embodiment, one end of the first centralized shutoff 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 centralized shutoff bridge arm is connected to the third auxiliary DC bus, and the other end is connected to one end of the third centralized shutoff bridge arm, and the connection point between the second centralized shutoff bridge arm and the third centralized shutoff bridge arm is connected to the first auxiliary DC bus.

[0069] Figure 5 A schematic diagram of a modification embodiment of a 12-pulsation converter valve hall that achieves controllable shutdown while retaining the original double uncontrollable converter valves according to an exemplary embodiment of the present application is shown.

[0070] like Figure 5 As shown, the original double valve tower is retained, and 6 additional controllable shut-off double valve towers are added (for example, the A phase uncontrollable valve tower, the B phase uncontrollable valve tower and the C phase uncontrollable valve tower), and the additional controllable shut-off valve tower includes additional controllable shut-off bridge arms (for example, V42) with the same number of converter bridge arms as the uncontrollable valve tower, and each additional controllable shut-off valve tower is individually suspended next to the corresponding uncontrollable valve tower, or is fixed to the corresponding uncontrollable valve tower with a structural member.

[0071] exist Figure 5 In the embodiment shown, six uncontrollable transfer double valve towers are added (for example, A phase uncontrollable transfer valve tower, B phase uncontrollable transfer valve tower, C phase uncontrollable transfer valve tower), and the uncontrollable transfer double valve tower is a supporting structure, including two uncontrollable transfer converter bridge arms (for example, V43).

[0072] exist Figure 5 In the illustrated embodiment, two centralized shutoff double valve towers are added, and the centralized shutoff double valve towers are supporting structures, and each centralized shutoff double valve tower includes two centralized shutoff bridge arms (eg, V71).

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

[0074] According to an embodiment of the present application, any one of the uncontrollable commutation bridge arm and the uncontrollable transfer commutation bridge arm includes at least one level of power semiconductor device with non-controllable shut-off capability; or at least one level of power semiconductor device with non-shut-off capability and at least one level of non-controllable shut-off power semiconductor connected in parallel or in series. The non-controllable shut-off power semiconductor includes a diode, a thyristor, or a combination of a diode and a thyristor.

[0075] Figure 6 A schematic diagram of an embodiment of an uncontrollable bridge arm or an uncontrollable transfer bridge arm according to an exemplary embodiment of the present application is shown.

[0076] like Figure 6 As shown, in embodiment a, the uncontrollable commutation bridge arm is composed of at least one level of diodes with uncontrollable turn-off capability connected in series and in parallel; in embodiment b, the uncontrollable commutation bridge arm is composed of at least one level of thyristors with uncontrollable turn-off capability connected in series and in parallel; in embodiment c, the uncontrollable commutation bridge arm is composed of at least one level of thyristors with uncontrollable turn-off capability and at least one level of uncontrolled turn-off power semiconductor diode connected in series, and then at least one group of thyristors and diode components are connected in parallel.

[0077] According to an embodiment of the present application, any one of the additional controllable shutdown bridge arm or the centralized controllable shutdown bridge arm includes: at least one level of power semiconductor devices with controllable shutdown capability; or at least one level of power semiconductor devices with controllable shutdown capability connected to at least one level of uncontrollable shutdown power semiconductor. In some embodiments, the power semiconductor device with controllable shutdown capability is connected in parallel with an overvoltage energy limiting device, wherein the overvoltage energy limiting device is a metal zinc oxide arrester.

[0078] In practice, the power semiconductor device with controllable shutdown capability includes any one of IGBT and IGCT, or a circuit based on a combination of IGBT and IGCT.

[0079] Figure 7 A schematic diagram of an embodiment of an additional controllable shutdown bridge arm or a centrally controllable shutdown bridge arm according to an exemplary embodiment of the present application is shown.

[0080] like Figure 7 As shown, in embodiment a, the controllable shutdown bridge arm is composed of at least one stage of IGBTs with controllable shutdown capability connected in series and in parallel.

[0081] In embodiment b, the controllable shutdown bridge arm is composed of at least one stage of IGCTs with controllable shutdown capability connected in series and in parallel.

[0082] In embodiment c, the controllable shutdown bridge arm is composed of at least one IGBT with controllable shutdown capability and at least one uncontrollable shutdown power semiconductor diode connected in series, and then at least one group of IGBT and diode components are connected in parallel.

[0083] In embodiment d, the controllable shutdown bridge arm is composed of at least one IGCT with controllable shutdown capability and at least one uncontrollable shutdown power semiconductor diode connected in series, and then at least one group of IGCT and diode components are connected in parallel.

[0084] In embodiment e, the controllable shutdown bridge arm is composed of at least one IGBT with controllable shutdown capability and at least one uncontrollable shutdown power semiconductor thyristor connected in series, and then at least one group of IGBT and thyristor components are connected in parallel.

[0085] In embodiment f, the controllable shutdown bridge arm is composed of at least one stage of IGCT with controllable shutdown capability and at least one stage of uncontrollable shutdown power semiconductor thyristor connected in series, and then at least one group of IGCT and thyristor assembly are connected in parallel.

[0086] In embodiment g, the controllable shutdown bridge arm is composed of at least one IGBT with controllable shutdown capability, at least one uncontrollable shutdown power semiconductor thyristor, and at least one uncontrollable shutdown power semiconductor diode connected in series, and then at least one group of IGBT, thyristor and diode components are connected in parallel.

[0087] In embodiment h, the controllable shutdown bridge arm has two ends, one end of at least one level of non-controllable shutdown power semiconductor thyristor is the first output end of the controllable shutdown bridge arm, the other end of at least one level of non-controllable shutdown power semiconductor thyristor and one end of at least one level of IGBT with controllable shutdown capability are connected to one end of at least one level of non-controllable shutdown power semiconductor thyristor, the other end of at least one level of IGBT with controllable shutdown capability is connected to one end of at least one level of non-controllable shutdown power semiconductor diode, and the other end of at least one level of non-controllable shutdown power semiconductor diode is connected to the other end of at least one level of non-controllable shutdown power semiconductor thyristor to form the second output end of the controllable shutdown bridge arm.

[0088] In embodiment i, the controllable shutdown bridge arm has two ends, one end of at least one level of non-controllable shutdown power semiconductor thyristor is the first output end of the controllable shutdown bridge arm, the other end of at least one level of non-controllable shutdown power semiconductor thyristor and one end of at least one level of IGCT with controllable shutdown capability are connected to one end of at least one level of non-controllable shutdown power semiconductor thyristor, the other end of at least one level of IGCT with controllable shutdown capability is connected to one end of at least one level of non-controllable shutdown power semiconductor diode, and the other end of at least one level of non-controllable shutdown power semiconductor diode is connected to the other end of at least one level of non-controllable shutdown power semiconductor thyristor to form the second output end of the controllable shutdown bridge arm.

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

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

[0091] In Example 1, the controllable shutdown bridge arm has two ends, one end of at least one level of IGBT with controllable shutdown capability is connected to one end of the capacitor, the other end of at least one level of IGBT with controllable shutdown capability is connected to one end of at least one level of IGBT with controllable shutdown capability to form a first output end of the controllable shutdown bridge arm, and the other end of at least one level of IGBT with controllable shutdown capability is connected to the other end of the capacitor to form a second output end of the controllable shutdown bridge arm.

[0092] According to some embodiments of the present application, an uncontrollable valve tower (including an uncontrollable double valve tower or an uncontrollable 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 uncontrollable transfer valve tower (including the uncontrollable transfer double valve tower or the uncontrollable transfer quadruple valve tower) is arranged on the valve hall floor through supporting insulators.

[0094] In other embodiments, the centralized shut-off valve tower (including a centralized shut-off double valve tower or a centralized shut-off quadruple valve tower) is arranged on the valve hall floor through supporting insulators.

[0095] The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and its core idea of ​​the present application. At the same time, changes or deformations made by those skilled in the art based on the ideas of the present application, the specific implementation methods and the scope of application of the present application, all belong to the scope of protection of the present application. In summary, the content of this specification should not be construed as a limitation on the present application.

Claims

1. A converter valve hall, characterized in that: include: At least one 12-pulsation uncontrollable valve group, wherein the 12-pulsation uncontrollable valve group includes a plurality of uncontrollable valve towers, and the uncontrollable valve towers are suspended structures; At least one 12-pulse additional controllable shut-off valve group, the 12-pulse additional controllable shut-off valve group includes a plurality of additional controllable shut-off valve towers, the additional controllable shut-off valve towers are suspended separately beside the corresponding uncontrollable valve towers, or are fixed to the corresponding uncontrollable valve towers by structural members; At least one 12-pulse uncontrollable transfer valve group, the 12-pulse uncontrollable transfer valve group includes a plurality of uncontrollable transfer valve towers, the uncontrollable transfer valve towers are supporting structures, and are electrically connected to the three-phase AC incoming line input end of the converter valve hall; as well as At least one 12-pulse centralized shut-off valve group, the 12-pulse centralized shut-off valve group includes at least one centralized shut-off valve tower, the centralized shut-off valve tower is a supporting structure, 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; wherein the uncontrollable valve tower includes an uncontrollable quadruple valve tower, and the uncontrollable quadruple valve tower includes a plurality of uncontrollable converter bridge arms; or The uncontrollable valve tower comprises an uncontrollable double valve tower, and the uncontrollable double valve tower comprises a plurality of uncontrollable converter bridge arms.

2. The converter valve hall according to claim 1, characterized in that: The additional controllable shut-off valve tower includes an additional controllable shut-off quadruple valve tower, the additional controllable shut-off quadruple valve tower includes a plurality of additional controllable shut-off bridge arms, and the number of the additional controllable shut-off bridge arms included in the additional controllable shut-off quadruple valve tower is the same as the number of the uncontrollable commutation bridge arms included in the uncontrollable quadruple valve tower; or The additional controllable shut-off valve tower includes an additional controllable shut-off double valve tower, and the additional controllable shut-off double valve tower includes multiple additional controllable shut-off bridge arms, and the number of additional controllable shut-off bridge arms included in the additional controllable shut-off double valve tower is the same as the number of uncontrollable conversion bridge arms included in the uncontrollable double valve tower.

3. The converter valve hall according to claim 2, characterized in that: The uncontrollable transfer valve tower comprises an uncontrollable transfer quadruple valve tower, and the uncontrollable transfer quadruple valve tower comprises a plurality of uncontrollable transfer converter bridge arms; or The uncontrollable transfer valve tower comprises an uncontrollable transfer double valve tower, and the uncontrollable transfer double valve tower comprises a plurality of uncontrollable transfer converter bridge arms.

4. The converter valve hall according to claim 3, characterized in that: The centralized shut-off valve tower comprises a centralized shut-off quadruple valve tower, and the centralized shut-off quadruple valve tower comprises a plurality of centralized shut-off bridge arms; or The centralized shut-off valve tower comprises a centralized shut-off double valve tower, and the centralized shut-off double valve tower comprises a plurality of centralized shut-off bridge arms.

5. The converter valve hall according to claim 4, characterized in that: It also includes multiple AC line input terminals, including: The AC line input terminal is respectively connected to the midpoint of the two converter bridge arms at the upper end and the midpoint of the two converter valve bridge arms at the lower end of the additional controllable shut-off quadruple valve tower; or The AC line input terminals are respectively connected to the midpoints of the additional controllable shutoff double valve tower groups.

6. The converter valve hall according to claim 1, characterized in that: 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, wherein: The first DC bus is connected to the high-voltage end of the 12-pulsation uncontrollable valve group 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-pulsation uncontrollable valve group 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-pulsation 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-pulsation uncontrollable transfer valve group; The fourth auxiliary DC bus is connected to the second neutral point of the 12-pulsation uncontrollable transfer valve group; and / or The fifth auxiliary DC bus is connected to the low-pressure end of the 12-pulse uncontrollable transfer valve group.

7. The converter valve hall according to claim 6, characterized in that: The 12-pulse centralized shut-off valve group includes: A first centralized shutdown 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 centralized shut-down bridge arm, one end of which is connected to the third auxiliary DC bus; A third centralized shutdown bridge arm, one end of which is connected to the other end of the second centralized shutdown bridge arm, the other end of the third centralized shutdown bridge arm is connected to the fourth auxiliary DC bus, and the connection point between the second centralized shutdown bridge arm and the third centralized shutdown bridge arm is connected to the first auxiliary DC bus; and / or The fourth centralized shutdown bridge arm has one end connected to the fifth auxiliary DC bus and the other end connected to the second DC bus.

8. The converter valve hall according to claim 4, characterized in that: Any one of the uncontrollable commutation bridge arm and the uncontrollable transfer commutation bridge arm comprises: Power semiconductor devices with at least one level of uncontrolled shutdown capability; or At least one level of power semiconductor device with non-shutdown capability and at least one level of non-controllable shutoff power semiconductor are connected in parallel or in series.

9. The converter valve hall according to claim 4, characterized in that: Either the additional controllable shutdown bridge arm or the centrally controllable shutdown bridge arm comprises: At least one power semiconductor device with controllable shutdown capability; or At least one level of power semiconductor device with controllable shutdown capability is connected to at least one level of uncontrollable shutdown power semiconductor.

10. The converter valve hall according to claim 9, characterized in that: A power semiconductor device with controllable shutdown capability is connected in parallel with an overvoltage energy limiting device, wherein the overvoltage energy limiting device is a metal zinc oxide arrester.

11. The converter valve hall according to claim 8 or 9, characterized in that: The power semiconductor device with controllable shutdown capability includes any one of IGBT and IGCT or a circuit based on a combination of IGBT and IGCT; and / or The uncontrollably turned-off power semiconductor includes a diode, a thyristor, or a combination of a diode and a thyristor.

12. The converter valve hall according to claim 1, characterized in that: The uncontrollable valve tower is suspended on the top of the valve hall through a suspension insulator.

13. The converter valve hall according to claim 1, characterized in that: The uncontrollable transfer valve tower is arranged on the valve hall floor through supporting insulators.

14. The converter valve hall according to claim 1, characterized in that: The centralized shut-off valve tower is arranged on the valve hall floor through supporting insulators.

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