Hybrid commutation converter valve based on igct and valve assembly thereof

Abstract

The application provides an IGCT-based hybrid commutation converter valve and a valve assembly thereof, which can reduce or even avoid the influence on the performance of the converter valve caused by the consistency difficulty of the IGCT device. To solve the above technical problem, the application provides a hybrid commutation converter valve, which comprises a valve assembly, the valve assembly comprises a plurality of gate commutation thyristors arranged in sequence along a first direction, and the valve assembly further comprises a radiator row, the radiator row comprises a plurality of radiators arranged in sequence along the first direction; each gate commutation thyristor is clamped between two adjacent radiators; the valve assembly further comprises a lightning arrester assembly, the lightning arrester assembly comprises a lightning arrester unit, each lightning arrester unit comprises one lightning arrester or a plurality of parallel lightning arresters; each lightning arrester unit is connected with two adjacent radiators in the radiator row to be parallel to the gate commutation thyristor between the two adjacent radiators, and each gate commutation thyristor is parallel to a corresponding lightning arrester unit.

Description

Technical Field

[0001] This application relates to the field of electrical technology, and specifically to a valve assembly for a hybrid commutation valve based on IGCT. Background Technology

[0002] Direct current (DC) transmission, due to its large energy capacity and long transmission distance, has become the preferred choice for high-capacity, long-distance power transmission compared to the limitations of AC transmission. Flexible DC transmission technology is constrained by limited overvoltage and overcurrent tolerance and the difficulty in self-eliminating DC short-circuit faults. Therefore, high-voltage DC transmission projects typically employ conventional DC line-commutated converter (LCC) technology. However, commutation failures in LCC technology have a relatively high probability of occurring in conventional DC transmission systems. Consecutive commutation failures cause significant power drops, posing a serious threat to the safe and stable operation of the power grid. The reason for commutation failures is that LCC technology uses semi-controlled thyristor devices, meaning the thyristors cannot be controlled to turn off. When an AC fault causes a voltage drop, the thyristors do not have sufficient reverse recovery time to turn back on, and they also lack the ability to interrupt current when a DC system fault occurs.

[0003] To address this, related technical solutions have begun to employ hybrid commutated converter (HCC) technology based on IGCT (Integrated Gate-Commutated Thyristor) devices. This technology enables controlled on-time and active off-time, achieving reliable commutation and reducing the risk of conventional DC commutation failure. However, the consistency of IGCT devices is difficult to guarantee, which is an inherent limitation of IGCTs. This limitation can affect the performance of the hybrid commutated converter, impacting commutation and even damaging the converter. Utility Model Content

[0004] The purpose of this application is to provide a hybrid commutation valve and its valve assembly based on IGCT, which can reduce or even avoid the impact on the performance of the commutation valve caused by the difficulty in ensuring the consistency of IGCT devices.

[0005] To address the aforementioned technical problems, this application provides a valve assembly for a hybrid commutation valve based on IGCT, comprising a valve assembly including a plurality of gate commutation thyristors arranged sequentially along a first direction, and a heat sink array including a plurality of heat sinks arranged sequentially along the first direction; each gate commutation thyristor is sandwiched between two adjacent heat sinks.

[0006] The valve assembly further includes a surge arrester assembly, which includes surge arrester units. Each surge arrester unit includes one or more surge arresters connected in parallel. Each surge arrester unit is connected to two adjacent radiators in the radiator array to be connected in parallel with the gate commutator thyristor between the two adjacent radiators. Each gate commutator thyristor is connected in parallel with a corresponding surge arrester unit.

[0007] Optionally, the radiator array and the surge arrester assembly are arranged along a second direction, which is perpendicular to the first direction;

[0008] The surge arrester assembly includes at least two rows of surge arrester unit rows distributed along a third direction, the third direction being perpendicular to the first direction and the second direction; each surge arrester unit row includes at least two surge arrester units, and a plurality of surge arrester units in each surge arrester unit row are arranged along the first direction.

[0009] Optionally, the valve assembly includes a driver row, which includes a plurality of drivers arranged sequentially along the first direction. The drivers and the gate commutator thyristors are arranged in a one-to-one correspondence, and the drivers are used to drive the corresponding gate commutator thyristors.

[0010] The driver array, the radiator array, and the surge arrester assembly are arranged sequentially along the second direction.

[0011] Optionally, the surge arrester assembly includes a connection component, with each surge arrester unit matched with one of the connection components;

[0012] The connection assembly includes two connectors. The surge arrester unit is connected to one of the two adjacent heat sinks through one of the connectors and to the other of the two adjacent heat sinks through the other connector.

[0013] Optionally, the axis of the surge arrester is parallel to the first direction, the two connectors in each connection assembly have the same structure, and the two connectors are symmetrically arranged along the radial centerline of the surge arrester, which is parallel to the second direction.

[0014] Optionally, a connector of one surge arrester unit in one surge arrester unit row and a connector of one surge arrester unit in another adjacent surge arrester unit row are both directly connected to the same radiator, and are connected to two different locations distributed along the third direction of the radiator.

[0015] Optionally, the surge arrester assembly further includes multiple connection structures that are connected one-to-one with the multiple heat sinks; a connector of one surge arrester unit in one surge arrester unit in one row of surge arresters and a connector of one surge arrester unit in another adjacent row of surge arresters are both connected to the same connection structure.

[0016] Optionally, when projected along the third direction, two adjacent surge arrester units in the projection partially overlap in the first direction.

[0017] Optionally, the axis of the surge arrester is parallel to the first direction, satisfying: S=2(L2-L1).

[0018] Wherein, L1 is the distance between the centerlines of two adjacent heat sinks extending along the second direction, L2 is the length of the surge arrester along the axial direction, and S is the length of the overlapping portion along the first direction.

[0019] Optionally, each of the surge arrester units includes at least two surge arresters, and all the surge arresters in each surge arrester unit are arranged sequentially along the second direction.

[0020] Optionally, the surge arrester assembly further includes a first support frame, the first support frame including a plurality of first support plates distributed along the third direction, the thickness direction of each first support plate being parallel to the third direction; each row of surge arrester units is supported on one of the first support plates.

[0021] Optionally, each of the surge arrester units includes at least two surge arresters, and all the surge arresters in each surge arrester unit are arranged sequentially along the third direction.

[0022] Optionally, the surge arrester assembly further includes a second support frame, the second support frame including a second support plate, the thickness direction of the second support plate being parallel to the second direction, and multiple rows of surge arrester units being mounted on the second support plate.

[0023] Optionally, the connection assembly further includes a connecting shaft that passes through one of the surge arresters and is connected to the two connectors.

[0024] The valve assembly of the IGCT-based hybrid commutation valve in this application can achieve reliable commutation through active turn-off of the gate commutation thyristor, reducing the risk of conventional DC commutation failure. Moreover, the use of a parallel connection between the surge arrester unit and the gate commutation thyristor gives it advantages such as large current capacity, high withstand voltage, and low conduction voltage drop, making it suitable for ultra-high voltage (above 500kV, such as 800kV) DC transmission applications. The surge arrester unit has the advantages of low residual voltage, fast response, small discreteness, and nonlinearity. The arrangement of the surge arrester unit can reduce or even eliminate the problems caused by the difficulty in ensuring the consistency of IGCT devices, thereby effectively solving the dynamic voltage balancing problem of hundreds of devices connected in series, and also providing good protection for each IGCT device.

[0025] This application also provides a hybrid commutation valve based on IGCT, including the valve assembly described in any of the above claims, and having the same technical effects as the valve assembly described above. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the hybrid commutation valve in the first embodiment of this application;

[0027] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0028] Figure 3 for Figure 2 A magnified view of part B in the middle;

[0029] Figure 4 This is a schematic diagram of the structure in which the valve assembly and capacitor are mounted on the two side beams of the frame;

[0030] Figure 5 for Figure 4 A magnified view of part C in the middle;

[0031] Figure 6 for Figure 4 Schematic diagram of the structure of the surge arrester assembly;

[0032] Figure 7 for Figure 6 A schematic diagram of the structure of the surge arrester assembly from another perspective;

[0033] Figure 8 for Figure 6 A schematic diagram of the connection components of the surge arrester assembly;

[0034] Figure 9 This is a schematic diagram of the structure of the hybrid commutation valve in the second embodiment of this application;

[0035] Figure 10 for Figure 9A schematic diagram of the structure in which the valve assembly and capacitor are mounted on the two side beams of the frame;

[0036] Figure 11 for Figure 10 Schematic diagram of the structure of the surge arrester assembly;

[0037] Figure 12 for Figure 11 Another structural schematic diagram of the surge arrester assembly;

[0038] Figure 13 for Figure 11 A schematic diagram of a connector and a connecting structure.

[0039] Figure 14 This is a schematic diagram of the structure of the hybrid commutation valve in the third embodiment of this application.

[0040] The annotations in the attached figures are explained as follows:

[0041] 10-Frame; 101-Side beam; 102-Crossbeam;

[0042] 20-Reactor;

[0043] 30 - Valve assembly;

[0044] 301-Surge arrester assembly; 3011-Surge arrester unit; 30111-Connector; 30111a-First connecting part; 30111b-Second connecting part; 30111b1-First connecting section; 30111b2-Second connecting section; 30111b3-Third connecting section; 30111c-Third connecting part; 30111c1-Connecting hole; 30112-Surge arrester; 30113-Connecting shaft; 3 012-First support frame; 30121-First support plate; 30121a-Weight reduction hole; 30122-First support base; 30123-Second support base; 3013-Second support frame; 30131-Second support plate; 30132-Third support base; 3014-Connecting structure; 30141-First structural component; 30141a-Connecting hole; 30142-Second structural component; 3015-Fastener;

[0045] 302 - Radiator;

[0046] 303 - Clamping mechanism;

[0047] 304-Rod Resistor;

[0048] 305 - Integrated gate commutated thyristor; 3051 - Gate commutated thyristor; 3052 - Driver;

[0049] 40-capacitor;

[0050] 50 - Cooling piping;

[0051] 60-Shielding cover. Detailed Implementation

[0052] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. In the embodiments of this application, the terms "first," "second," and "third" are used only to distinguish the same or similar technical features, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0053] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the hybrid commutation valve in the first embodiment of this application.

[0054] The hybrid commutation valve in this embodiment includes a valve assembly 30, a reactor 20, a cooling pipe 50, a capacitor 40, and a shield 60. The cooling pipe 50 can cool and dissipate heat from the valve assembly 30 and the reactor 20. Figure 1 In the mixed-phase converter valve, a frame 10 is also included. The valve assembly 30, reactor 20, cooling pipe 50, and capacitor 40 mentioned above are all mounted on the frame 10. The frame 10 may include two side beams 101 and multiple crossbeams 102 located between the two side beams 101. The valve assembly 30, reactor 20, etc. can be fixed to the corresponding crossbeams 102 according to the arrangement. Of course, the structure of the frame 10 is not limited to this. For example, it can also be a plate structure. In comparison, the frame 10, which includes crossbeams 102 and side beams 101, has a simpler structure, is lighter in weight, and is also easier to arrange the circuit. In addition, in this embodiment, the valve assembly 30 and the corresponding capacitor 40 are distributed along the second direction Y to form a set of electrical components. The hybrid commutation valve may include two sets of electrical components, which are distributed along the first direction X. The first direction X and the second direction Y are perpendicular. The reactor 20 is set at both ends of the two sets of electrical components along the first direction X, and two reactors 20 are arranged at each end. The two reactors 20 are also distributed along the second direction Y. This arrangement is relatively compact.

[0055] Let's look again. Figures 2 to 5 understand, Figure 2 for Figure 1 A magnified view of part A in the middle; Figure 3 for Figure 2 A magnified view of part B in the middle; Figure 4 A schematic diagram of the structure in which valve assembly 30 and capacitor 40 are mounted on two side beams 101 of frame 10; Figure 5 for Figure 4 A magnified view of part C in the middle.

[0056] The valve assembly 30 in this embodiment includes a thyristor array, which comprises a plurality of integrated gate-commutated thyristors 305 arranged sequentially along a first direction X. Each integrated gate-commutated thyristor 305 is an IGCT (Integrated Gate-Commutated Thyristor) device, and each IGCT includes a gate-commutated thyristor 3051, which is a GCT (Gate-Commutated Thyristor) device. The integrated gate-commutated thyristor 305 also includes a driver 3052 for driving the gate-commutated thyristor 3051. Figure 2 As can be seen, in a row of integrated gate commutated thyristors 305, multiple gate commutated thyristors 3051 are arranged in a row as a gate commutated thyristor row, and multiple drivers 3052 are arranged in a separate row as a driver row. The driver row and the gate commutated thyristor row are arranged along the second direction Y.

[0057] The valve assembly 30 also includes a heat sink array corresponding to the thyristor array. The heat sink array includes multiple heat sinks 302 arranged sequentially along the first direction X. Rod-shaped resistors 304 can be inserted into the heat sinks 302. For example, Figure 2 As shown, each gate-commutated thyristor 3051 in the thyristor array is sandwiched between two adjacent heat sinks 302. This can also be understood as multiple gate-commutated thyristors 3051 and multiple heat sinks 302 being arranged alternately along the first direction X. To ensure contact between the gate-commutated thyristors 3051 and the heat sinks 302, a clamping mechanism 303 is provided to clamp the multiple gate-commutated thyristors 3051 and the heat sinks 302 along the first direction X. The coolant in the aforementioned cooling pipe 50 can flow through the heat sinks 302, thereby cooling the gate-commutated thyristors 3051 between two adjacent heat sinks 302. The arrangement of the cooling pipe 50 can vary, and will not be discussed further in this embodiment.

[0058] In this embodiment, the valve assembly 30 also includes a surge arrester assembly 301, with each thyristor bank matched with one surge arrester assembly 301, such as... Figure 2 , 4 As shown, the surge arrester assembly 301 and the radiator array are arranged along the second direction Y. The surge arrester assembly 301 includes a plurality of surge arrester units 3011, and each surge arrester unit 3011 includes at least one surge arrester 30112. Figure 4Each surge arrester unit 3011 shown includes two surge arresters 30112. Clearly, when there are multiple surge arresters 30112 in a surge arrester unit 3011 (i.e., two or more), the multiple surge arresters 30112 in the surge arrester unit 3011 are connected in parallel. Each surge arrester unit 3011 is connected to two adjacent heat sinks 302 in the heat sink row, and is connected in parallel with the gate commutated thyristor 3051 between the two adjacent heat sinks 302. Thus, each gate commutated thyristor 3051 is connected in parallel with a corresponding surge arrester unit 3011. That is, in this embodiment, the surge arrester unit 3011 and the gate commutated thyristor 3051 of the valve assembly 30 are connected in a "one-to-one" pairing configuration.

[0059] The hybrid commutation valve in this embodiment can achieve reliable commutation by actively shutting off the integrated gate commutation thyristor 305, eliminating the risk of conventional DC commutation failure. Moreover, the parallel connection of the surge arrester unit 3011 and the gate commutation thyristor 3051 gives it advantages such as large current capacity, high withstand voltage, and low conduction voltage drop, making it suitable for ultra-high voltage (e.g., 800kV) DC transmission applications. The surge arrester unit 3011 has the advantages of low residual voltage, fast response, small discreteness, and nonlinearity, which can effectively solve the problem of dynamic voltage balancing of hundreds of devices in series, and also provides good protection for each device.

[0060] As mentioned above, the radiator array and surge arrester assembly 301 in this embodiment can be arranged along the second direction Y. It is worth noting that the surge arrester assembly 301 in this embodiment can include at least two rows of surge arrester unit rows distributed along the third direction Z. Each row of surge arrester unit rows includes at least two surge arrester units 3011, and the multiple surge arrester units 3011 in each row are arranged along the first direction X. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other, and the third direction Z is also the height direction of the hybrid commutation valve.

[0061] You can continue to refer to this. Figure 6 and Figure 7 understand, Figure 6 for Figure 4 Schematic diagram of the structure of the surge arrester assembly 301; Figure 7 for Figure 6 A schematic diagram of the structure of the surge arrester assembly 301 from another perspective.

[0062] The third direction Z is... Figure 6 , 7 In the vertical direction, that is, the multiple surge arrester units 3011 of the surge arrester assembly 301 in this embodiment can be distributed in vertical groups, for example, Figure 6 , 7The arrangement shown is in two rows, one above the other. The number of surge arrester units 3011 in each row can be relatively evenly distributed. In this embodiment, a total of eleven gate commutator thyristors 3051 are provided, so the number of surge arrester units 3011 is also eleven. The number of surge arrester units 3011 in the two rows can be five and six respectively. Of course, the number of integrated gate commutator thyristors 3051 and surge arrester units 3011 can also be other values. For example, for a small-component hybrid commutator valve, the number of integrated gate commutator thyristors 3051 and surge arrester units 3011 can be 6-9. For a large-component hybrid commutator valve, the number of integrated gate commutator thyristors 3051 and surge arrester units 3011 can be 10-14, or other numbers. This embodiment does not impose specific limitations. When setting up two rows of surge arrester units 3011, if the number of surge arrester units 3011 is even, the number of surge arrester units 3011 in the two rows can be equal; if the number of surge arrester units 3011 is odd, the number of surge arrester units 3011 in the two rows can differ by one. It is understandable that more than two rows of surge arrester units 3011 can also be set, depending on specific requirements.

[0063] Multiple surge arrester units 3011 are grouped along the third direction Z. This facilitates the connection between multiple surge arrester units 3011 and their corresponding heat sinks 302, shortening the connection path between the surge arrester units 3011 and the heat sinks 302.

[0064] Can be combined Figure 3 , 4 As you can understand, the heat sink 302 is generally a thin cuboid structure with the largest surface area. Multiple heat sinks 302 are arranged with their large surfaces facing each other. The gate commutator thyristor 3051 is also sandwiched between the large surfaces of two heat sinks 302. This helps to increase the contact area with the heat sink 302 and improve the cooling effect.

[0065] At this time, the dimension of the side of the heat sink 302 facing the surge arrester assembly 301 in the first direction X is relatively small, and this dimension can be defined as the thickness W of the heat sink 302, such as Figure 3As shown, this surface can be defined as the small surface of the heat sink 302, while the surge arrester 30112 is a roller structure, i.e., a cylindrical structure. Its radial or axial dimension is larger than the thickness of the small surface of the heat sink 302. In this embodiment, the axial length of the surge arrester 30112 is L2, and the distance between the centerlines of two adjacent small surfaces of the heat sink 302 extending along the second direction Y is L1. L2 is generally greater than L1. At this time, if each surge arrester unit 3011 is arranged along the first direction X, the length of the arrangement will be greater than the length of the heat sink array, and the distance between some surge arrester units 3011 and the corresponding heat sink 302 will be relatively far. If all surge arrester units 3011 are arranged in a row along the second direction Y, or if all surge arrester units 3011 include multiple rows of surge arrester units arranged along the first direction X, with each row of surge arrester units arranged along the second direction Y, meaning all surge arrester units 3011 are arranged in the XY plane, then some surge arrester units 3011 will inevitably be far from their corresponding heat sinks 302. This distance between the surge arrester units 3011 and their corresponding heat sinks 302 will result in longer connection paths, leading to situations where some connection paths are short and others are long. In this embodiment, the surge arrester units 3011 are distributed along the third direction Z, that is, along the height direction of the heat sink 302. This makes it easier for the surge arrester units 3011 to connect to their corresponding heat sinks 302 with shorter paths, thereby giving the circuit low stray inductance and improving the power of the hybrid commutation valve.

[0066] In addition, such as Figure 2 , 4 As shown, in this embodiment, multiple drivers 3052 are arranged along the first direction X to form a driver row, and the driver row, heat sink row, and surge arrester assembly 301 are arranged sequentially along the second direction Y. That is, compared to the driver row, the heat sink row is closer to the surge arrester assembly 301. In this way, when the surge arrester assembly 301 is connected to the heat sink row, it does not need to bypass the driver row, which can help to shorten the connection path. Figure 3 In the middle, the surge arrester unit 3011 and the heat sink 302 have a distance L3 in the second direction Y. When the surge arrester unit 3011 and the corresponding heat sink 302 are connected, they do not need to bypass other components, and the distance L3 is relatively short.

[0067] Can continue to combine Figure 3 , 5 -7 Understand and refer to Figure 8 , Figure 8 for Figure 6 A schematic diagram of the connection components of the surge arrester assembly 301.

[0068] The surge arrester assembly 301 in this embodiment also includes a connection assembly, with each surge arrester unit 3011 matched with one connection assembly. The connection assembly includes two connectors 30111, which can be copper busbar structures. The surge arrester unit 3011 is connected to one of two adjacent heat sinks 302 via one connector 30111, and to the other of the two adjacent heat sinks 302 via the other connector 30111. In this way, the surge arrester unit 3011 and the gate commutated thyristors 3051 between the two adjacent heat sinks 302 can be connected in parallel, resulting in a simple and reliable connection.

[0069] Specifically, the two connectors 30111 in each connecting component can have the same structure, such as... Figure 8 As shown, the surge arresters 30112 are symmetrically arranged along their radial centerline, which is parallel to the second direction Y. In this embodiment, when the surge arrester assembly 301 is arranged, the axis of the surge arrester 30112 is parallel to the first direction X. Two connecting pieces 30111 are respectively connected to both ends of the axial direction of the surge arrester 30112. When the number of surge arresters 30112 in the surge arrester unit 3011 is greater than one, the multiple surge arresters 30112 are arranged along the second direction Y. Each connecting piece 30111 can simultaneously connect to the axial ends of multiple surge arresters 30112 on the same side in the surge arrester unit 3011, thereby achieving parallel connection of multiple surge arresters 30112 in the surge arrester unit 3011. If the connecting pieces 30111 at both ends of each surge arrester unit 3011 are configured with the same structure, processing is more convenient, requiring only the fabrication of one type of connecting piece 30111. Of course, the structures of the two connecting pieces 30111 in the connecting assembly can also be different.

[0070] In addition, each connecting assembly may also include a connecting shaft 30113, which connects two connecting pieces 30111. The connecting shaft 30113 passes through the surge arrester 30112, thus connecting the surge arrester 30112 to the two connecting pieces 30111 at both ends. When there are multiple surge arresters 30112 in the surge arrester unit 3011, a corresponding number of connecting shafts 30113 are provided, with each connecting shaft 30113 simultaneously connecting two connecting pieces 30111. The connecting shaft 30113 may, for example, have a threaded section, and after passing through the connecting piece 30111, it can be fixed by a nut. The connecting shaft 30113 facilitates the assembly of the connecting assembly and the surge arrester 30112, achieving a modular design, a simple and compact structure, improved seismic performance, and a reasonable structure that facilitates maintenance and installation.

[0071] In this embodiment, apart from the two outermost heat sinks 302 distributed along the first direction X (the number of heat sinks 302 is one more than the number of gate commutated thyristors 3051), each of the remaining heat sinks 302 needs to be connected to one connector 30111 of each of the two surge arrester units 3011. One connector 30111 of each of the two surge arrester units 3011 can be directly connected to the same heat sink 302. In this case, one connector 30111 of each of the two surge arrester units 3011 can be connected to two different positions on the heat sink 302 distributed along the third direction Z. Figure 5 From the perspective of the viewpoint, it can be seen that the upper and lower parts of a heat sink 302 are connected to a different surge arrester unit 3011.

[0072] Figure 8 In the process, each connector 30111 includes a first connecting part 30111a and a second connecting part 30111b. The first connecting part 30111a is a long strip structure extending along the second direction Y, so as to simultaneously connect the axial ends of the two surge arresters 30112 on the same side. The second connecting portion 30111b specifically includes a first connecting segment 30111b1, a second connecting segment 30111b2, and a third connecting segment 30111b3. The first connecting segment 30111b1 and the third connecting segment 30111b3 are arranged approximately parallel to each other and are both approximately parallel to the first direction X. The second connecting segment 30111b2 transitionally connects the first connecting segment 30111b1 and the third connecting segment 30111b3. The second connecting segment 30111b2 is approximately perpendicular to the first connecting segment 30111b1 and the third connecting segment 30111b3, and is approximately parallel to the second direction Y. Therefore, the second connecting portion 30111b is approximately U-shaped. The third connecting segment 30111b3 connects to the first connecting portion 30111a. The first connecting segment 30111b1 is provided with a connecting hole. Figure 8 (not shown in the image), such as Figure 5 As shown, the connection can be made via fastener 3015 inserted into the connecting hole and the corresponding heat sink 302. Projected along the second direction Y, the projection of the first connecting segment 30111b1 coincides with the projection of the surge arrester 30112. This reduces the space occupied by the first connecting segment 30111b1 in the first direction X. Of course, the second connecting part 30111b is not limited to a U-shaped structure; for example, it can also be an L-shaped structure. The width of the first connecting segment 30111b1 along the first direction X can be approximately equal to the width of the surge arrester 30112 along the first direction X to maximize the connection contact area and ensure the effectiveness of the mechanical and electrical connection.

[0073] In addition, such as Figure 6As shown, to reduce space occupation, the upper and lower rows of surge arrester units 3011 need to be arranged as compactly as possible. Projecting along the third direction Z, the projections of one row of surge arrester units 3011 and the multiple surge arresters 30112 of the adjacent row of surge arrester units 3011 will not be completely staggered, as shown... Figure 3 As shown, the projections of the upper row of surge arrester units 3011 and the lower row of surge arrester units 3011 in the third direction Z are partially offset and partially overlapped. The length of the overlapping portion of one surge arrester unit 3011 in one row and one surge arrester unit 3011 in the adjacent row in the first direction X is S.

[0074] In detail, it can be Figure 3 , 6 The eleven surge arrester units 3011 are labeled as surge arrester units A to K. The top row consists of surge arrester units A to E, and the bottom row consists of surge arrester units F to K. It can be seen that since the number of surge arrester units 3011 is odd, except for surge arrester unit K which only overlaps with surge arrester unit A and surge arrester unit E which only overlaps with surge arrester unit F, the remaining surge arrester units 3011 all partially overlap with two adjacent surge arrester units 3011 in the other row, and the length of the overlapping part along the first direction X is S=2(L2-L1).

[0075] As mentioned earlier, except for the two outermost heat sinks 302, the remaining heat sinks 302 need to be connected simultaneously to the connectors 30111 of the two surge arrester units 3011. If two adjacent surge arrester units 3011 in the same row are connected to the same heat sink 302, and the two connectors 30111 are connected to the same height position of the heat sink 302, interference may easily occur, or it may be difficult to guarantee the connection area. In this embodiment, one connector 30111 of one surge arrester unit 3011 in one surge arrester unit row and one surge arrester unit 3011 in another adjacent surge arrester unit row are both connected to the same heat sink 302. Figure 5 , 6 As shown, the two connectors 30111 of each surge arrester unit 3011 can be defined as the first connector and the second connector, respectively. The first connector is located at one axial end of the surge arrester unit 3011, and the second connector is located at the other axial end of the surge arrester unit 3011. The twelve radiators 302 can be labeled as the a-th radiator 302 to the l-th radiator 302. The first connector of the a-th surge arrester unit 3011 and the second connector of the k-th surge arrester unit 3011 are approximately opposite each other in the third direction Z, and can connect the l-th radiator 302 at different positions in the third direction Z, such as... Figure 5 As shown; for example, the second connector of the Ath surge arrester unit 3011 and the first connector of the Jth surge arrester unit 3011 are roughly opposite each other in the third direction Z, and can be connected to different positions of the kth radiator 302 in the third direction Z, and so on, without further details.

[0076] In this embodiment, the length of the first connecting segment 30111b1 extending in the first direction can be equal to the thickness W of the heat sink 302, that is, the entire first connecting segment 30111b1 can be in complete contact with the heat sink 302 in the first direction, such as... Figure 5 As shown, this facilitates increasing the contact area with the radiator 302, enabling a reliable mechanical and electrical connection.

[0077] You can continue to refer to this. Figure 6 In this embodiment, each surge arrester unit 3011 includes at least two surge arresters 30112, and all surge arresters 30112 in each surge arrester unit 3011 are arranged sequentially along the second direction Y. With this arrangement, the size of the multi-row surge arrester units 3011 in the third direction Z is small, which is equivalent to each row of surge arrester units 3011 being laid flat.

[0078] At this time, the surge arrester assembly 301 also includes a first support frame 3012, which includes a plurality of first support plates 30121 distributed along the third direction Z, the thickness direction of each first support plate 30121 being parallel to the third direction Z; each surge arrester unit 3011 is supported on one first support plate 30121. Figure 8 As shown, connector 30111 also includes a third connecting portion 30111c. Connector 30111 can be fixed to the first support plate 30121 via the third connecting portion 30111c. The third connecting portion 30111c may have a connecting hole 30111c1, and the first support plate 30121 can be fixed by a fastener passing through the connecting hole 30111c1. The third connecting portion 30111c can extend a certain distance from the first connecting portion 30111a in a third direction Z and then extend to another connector 30111. The third connecting portion 30111c can be an L-shaped structure, as shown in the figure. Figure 7 Understood. Each connector 30111 may be provided with two third connecting parts 30111c along the second direction Y to improve the reliability of the connection with the first support plate 30121.

[0079] like Figure 6 As shown, the first support frame 3012 of the surge arrester assembly 301 in this embodiment also includes a support base, specifically including... Figure 6The first support base 30122 and the second support base 30123 are configured such that the first support plate 30121 located on the upper side is fixed to the frame 10 via the first support base 30122, and the first support plate 30121 located on the lower side is fixed to the frame 10 via the second support base 30123. Specifically, the first support base 30122 is a U-shaped bracket, and the second support base 30123 is an L-shaped bracket; however, the structural form of the support base is not limited. The structural form of the first support frame 3012 is not limited, as long as it can support multiple surge arrester units 3011 and can be fixed to the frame 10.

[0080] like Figure 6 , 7 As shown, in this embodiment, the first support plate 30121 of the first support frame 3012 is also provided with a weight reduction hole 30121a to reduce the mass of the mixing commutation valve.

[0081] Please continue to refer to this. Figures 9 to 12 understand, Figure 9 This is a schematic diagram of the structure of the hybrid commutation valve in the second embodiment of this application; Figure 10 for Figure 9 A schematic diagram of the structure in which the valve assembly 30 and capacitor 40 are mounted on the two side beams 101 of the frame 10; Figure 11 for Figure 10 Schematic diagram of the structure of the surge arrester assembly 301; Figure 12 for Figure 11 Another structural schematic diagram of the surge arrester assembly 301.

[0082] In this embodiment, the hybrid commutation valve has a structure that is basically the same as that in the first embodiment. The difference is that the connection between the surge arrester unit 3011 and the radiator 302 is slightly different in the second embodiment. In the first embodiment, the two connecting parts 30111 of the connecting component in the surge arrester assembly 301 are directly connected to the corresponding radiator 302. In the second embodiment, the two connecting parts 30111 of the connecting component are connected to the radiator 302 through the corresponding connecting structure 3014. That is, the radiator 302 has only one connection position. The connecting structure 3014 can be a copper busbar structure.

[0083] In the second embodiment, the surge arrester assembly 301 further includes multiple connection structures 3014 that are connected one-to-one with multiple heat sinks 302. A connector 30111 of one surge arrester unit 3011 and a connector 30111 of another surge arrester unit 3011 are both connected to the same connection structure 3014. The two connectors 30111 corresponding to each surge arrester unit 3011 have identical structures and are symmetrically arranged relative to the radial centerline of the surge arrester 30112. Similarly, defining the two connectors of each surge arrester unit 3011 as the first connector and the second connector, the first connector of one surge arrester unit 3011 in one row and the second connector of another surge arrester unit 3011 in another row are simultaneously connected to a connection structure 3014, and connected to the same heat sink 302 through this connection structure 3014.

[0084] In this embodiment, each surge arrester unit 3011 includes at least two surge arresters 30112, and all surge arresters 30112 in each surge arrester unit 3011 are arranged sequentially along the third direction Z.

[0085] Can be combined Figure 13 understand, Figure 13 for Figure 11 A schematic diagram of the connection between a connector 30111 and a connecting structure 3014.

[0086] The connection structure 3014 at this time includes a first structural member 30141 extending along a third direction Z. The first structural member 30141 is a long strip structure with connection holes 30141a at both ends for connecting to a first connector in one row of surge arrester units 3011 and a second connector in another row of surge arrester units 3011, respectively. The connection structure 3014 also includes a second structural member 30142, which may be an L-shaped structure. The second structural member 30142 includes a first portion extending along a second direction Y and a second portion extending along a first direction X. The first portion connects the first structural member 30141 and the second portion, and the second portion can be used to connect to the heat sink 302. The length of the second portion extending along the first direction X is, for example, equal to the thickness W of the heat sink 302. In addition, the connector 30111 at this time is approximately a cross-shaped structure to accommodate both connecting two surge arresters 30112 arranged along a third direction Z and connecting to the connection structure 3014.

[0087] At this time, as Figure 11 , 12As shown, the surge arrester assembly 301 in this embodiment also includes a second support frame 3013. The second support frame 3013 includes a second support plate 30131. The thickness direction of the second support plate 30131 is parallel to the second direction Y. Multiple surge arrester units 3011 are mounted on the second support plate 30131. The aforementioned connector 30111 has a cross-shaped structure, and the portion extending along the second direction Y can be provided with connection holes for connection and fixation with the second support plate 30131. Specifically, the second support frame 3013 can be an L-shaped plate, with the portion extending along the third direction Z forming the second support plate 30131, and the other portion perpendicular to the second support plate 30131. Both portions can be fixed by the third support base 30132 and the frame 10.

[0088] It should be understood that in the first embodiment, when there is more than one surge arrester 30112 in the surge arrester unit 3011, they are arranged along the second direction Y, which is the first arrangement method. The connector 30111 of each surge arrester unit 3011 is directly connected to the heat sink 302. In the second embodiment, when there is more than one surge arrester 30112 in the surge arrester unit 3011, they are arranged along the third direction Z, which is the second arrangement method. The connector 30111 of each surge arrester unit 3011 is connected to the heat sink 302 through a connecting structure 3014. However, it is obvious that in both the first and second arrangement methods, the connector 30111 can be directly connected or connected through the connecting structure 3014.

[0089] like Figure 6 As shown, in the first arrangement, the spacing between the two surge arresters 30112 and the radiator 302 in the second direction Y is not the same, resulting in different connection path lengths from the surge arresters 30112 to the radiator 302 within the same surge arrester unit 3011. In the second arrangement, however, the connection path lengths between the two surge arresters 30112 and the radiator 302 in the surge arrester unit 3011 are essentially the same, leading to better uniformity of electrical connections. However, the first arrangement is advantageous for reducing the height of the hybrid commutation valve.

[0090] Furthermore, in the first embodiment, each surge arrester unit 3011 is directly connected to the radiator 302 via its two connectors 30111, and can be directly connected to the radiator 302 along the second direction Y. This results in a shorter connection path when connecting to different positions of the radiator 302 in the third direction Z. In the second embodiment, since the surge arresters 30112 in the surge arrester unit 3011 are distributed along the third direction Z, their height is relatively high and may be higher than the radiator 302. Therefore, the connectors 30111 may not be able to connect to the radiator 302 if they extend directly along the second direction Y. Thus, they can be connected to the radiator 302 through the connection structure 3014, and only one connection position needs to be provided on the radiator 302.

[0091] When simulating the hybrid commutation valves distributed along the third direction Z in the surge arrester unit 3011, a lower stray inductance can be obtained. For example, in the first embodiment, the stray inductance can be controlled at 117nH. If the surge arrester unit 3011 in the first embodiment adopts the connection method of connection structure 3014, although the stray inductance is still at a low level, it will increase to 333nH due to the increased connection path. In the second embodiment, the stray inductance can be controlled at 204nH. If the surge arrester unit 3011 in the second embodiment is directly connected to the heat sink 302, the connection path will still be larger than that in the first embodiment, and the stray inductance will be 205nH. However, regardless of the setting method, the stray inductance is relatively low.

[0092] Please continue to refer to this. Figure 14 understand, Figure 14 This is a schematic diagram of the structure of the hybrid commutation valve in the third embodiment of this application.

[0093] The structure of the third embodiment can be understood with reference to the first and second embodiments, except that the hybrid commutation valve in the third embodiment is equipped with two reactors 20. Similarly, the valve assembly 30 and the corresponding capacitor 40 are distributed along the second direction Y to form a group of electrical components. The two reactors 20 are placed between the two groups of electrical components, and the cooling pipe 50 is adaptively adjusted in direction, that is, the number and position of the reactors 20 can be adjusted according to requirements. The arrangement of the valve assembly 30 is the same as in the above embodiments, and the technical effects can be understood accordingly, so they will not be repeated here.

[0094] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A valve assembly for a hybrid commutator valve based on IGCT, characterized in that, The valve assembly (30) includes a plurality of gate commutated thyristors (3051) arranged sequentially along a first direction (X), and the valve assembly (30) also includes a heat sink row, which includes a plurality of heat sinks (302) arranged sequentially along the first direction (X); each gate commutated thyristor (3051) is sandwiched between two adjacent heat sinks (302); The valve assembly (30) further includes a surge arrester assembly (301), which includes surge arrester units (3011). Each surge arrester unit (3011) includes one surge arrester (30112) or multiple surge arresters (30112) connected in parallel. Each surge arrester unit (3011) is connected to two adjacent radiators (302) in the radiator row to be connected in parallel with the gate commutator thyristor (3051) between the two adjacent radiators (302). Each gate commutator thyristor (3051) is connected in parallel with a corresponding surge arrester unit (3011).

2. The valve assembly of the IGCT-based hybrid commutation valve according to claim 1, characterized in that, The radiator array and the surge arrester assembly (301) are arranged along a second direction (Y), which is perpendicular to the first direction (X); The surge arrester assembly (301) includes at least two rows of surge arrester unit rows distributed along a third direction (Z), the third direction (Z) being perpendicular to the first direction (X) and the second direction (Y); each surge arrester unit row includes at least two surge arrester units (3011), and a plurality of surge arrester units (3011) in each surge arrester unit row are arranged along the first direction (X).

3. The valve assembly of the IGCT-based hybrid commutation valve according to claim 2, characterized in that, The valve assembly (30) includes a driver row, which includes a plurality of drivers (3052) arranged sequentially along the first direction (X). The drivers (3052) and the gate commutator thyristors (3051) are arranged in a one-to-one correspondence. The drivers (3052) are used to drive the corresponding gate commutator thyristors (3051). The driver array, the radiator array, and the surge arrester assembly (301) are arranged sequentially along the second direction (Y).

4. The valve assembly of the IGCT-based hybrid commutation valve according to claim 3, characterized in that, The surge arrester assembly (301) includes a connection component, and each surge arrester unit (3011) is matched with one of the connection components; The connection assembly includes two connectors (30111), the surge arrester unit (3011) is connected to one of the two adjacent heat sinks (302) through one of the connectors (30111), and to the other of the two adjacent heat sinks (302) through the other connector (30111).

5. The valve assembly of the IGCT-based hybrid commutation valve according to claim 4, characterized in that, The axis of the surge arrester (30112) is parallel to the first direction (X). The two connectors (30111) in each of the connecting assemblies have the same structure and are symmetrically arranged along the radial centerline of the surge arrester (30112), which is parallel to the second direction (Y).

6. The valve assembly of the IGCT-based hybrid commutation valve according to claim 4, characterized in that, A connector (30111) of one of the surge arrester units (3011) in one of the surge arrester unit rows, and a connector (30111) of one of the surge arrester units (3011) in another adjacent surge arrester unit row, are both directly connected to the same radiator (302) and are connected to two different locations on the radiator (302) distributed along the third direction (Z).

7. The valve assembly of the IGCT-based hybrid commutator valve according to claim 4, characterized in that, The surge arrester assembly (301) also includes a plurality of connection structures (3014) that are connected one-to-one with the plurality of heat sinks (302); a connector (30111) of one surge arrester unit (3011) in one surge arrester unit row and a connector (30111) of one surge arrester unit (3011) in another adjacent surge arrester unit row are both connected to the same connection structure (3014).

8. The valve assembly of the IGCT-based hybrid commutator valve according to any one of claims 2-7, characterized in that, Projecting along the third direction (Z), two adjacent surge arrester units (3011) in the projection partially overlap in the first direction (X).

9. The valve assembly of the IGCT-based hybrid commutation valve according to claim 8, characterized in that, The axis of the surge arrester (30112) is parallel to the first direction (X), satisfying: S=2(L2-L1). Wherein, L1 is the distance between the centerlines of two adjacent heat sinks (302) extending along the second direction (Y), L2 is the length of the surge arrester (30112) along the axial direction, and S is the length of the overlapping portion along the first direction (X).

10. The valve assembly of the IGCT-based hybrid commutator valve according to any one of claims 2-7, characterized in that, Each of the surge arrester units (3011) includes at least two surge arresters (30112), and all the surge arresters (30112) in each of the surge arrester units (3011) are arranged sequentially along the second direction (Y).

11. The valve assembly of the IGCT-based hybrid commutator valve according to claim 10, characterized in that, The surge arrester assembly (301) further includes a first support frame (3012), the first support frame (3012) including a plurality of first support plates (30121) distributed along the third direction (Z), the thickness direction of each first support plate (30121) being parallel to the third direction (Z); each row of surge arrester units (3011) is supported on one of the first support plates (30121).

12. The valve assembly of the IGCT-based hybrid commutator valve according to any one of claims 2-7, characterized in that, Each of the surge arrester units (3011) includes at least two surge arresters (30112), and all the surge arresters (30112) in each of the surge arrester units (3011) are arranged sequentially along the third direction (Z).

13. The valve assembly of the IGCT-based hybrid commutator valve according to claim 12, characterized in that, The surge arrester assembly (301) further includes a second support frame (3013), the second support frame (3013) includes a second support plate (30131), the thickness direction of the second support plate (30131) is parallel to the second direction (Y), and multiple rows of surge arrester units (3011) are all installed on the second support plate (30131).

14. The valve assembly of the IGCT-based hybrid commutator valve according to any one of claims 4-7, characterized in that, The connection assembly further includes a connecting shaft (30113) that passes through one of the surge arresters (30112) and is connected to two of the connectors (30111).

15. A mixed-phase commutation valve, characterized in that, The valve assembly includes the IGCT-based hybrid commutation valve as described in any one of claims 1-14.

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