IGCT-based hybrid commutation converter valve and valve assembly thereof

Abstract

The invention provides an IGCT-based hybrid commutation converter valve and a valve assembly thereof. The influence on the performance of the converter valve due to the fact that the consistency of IGCT devices is difficult to guarantee can be reduced and even avoided. In order to solve the technical problem, the hybrid commutation converter valve provided by the invention comprises a valve assembly, the valve assembly comprises a plurality of gate commutation thyristors which are sequentially arranged along a first direction, the valve assembly further comprises a radiator row, and the radiator row comprises a plurality of radiators which are sequentially arranged along the first direction; each gate commutated thyristor is clamped between two adjacent radiators; the valve assembly further comprises a lightning arrester assembly, the lightning arrester assembly comprises lightning arrester units, and each lightning arrester unit comprises a lightning arrester or a plurality of lightning arresters connected in parallel. Each lightning arrester unit is connected with two adjacent radiators in the radiator row so as to be connected with the gate commutated thyristor between the two adjacent radiators in parallel, and each gate commutated thyristor is connected with one corresponding lightning arrester unit in parallel.

Description

Technical Field

[0001] The present application relates to the field of electrical technology, and in particular to a valve assembly of a hybrid commutation valve based on IGCT. Background Art

[0002] DC transmission has become the preferred choice for large-capacity and long-distance power transmission compared to AC transmission due to its large transmission energy and long transmission distance. Flexible DC transmission technology is limited by its limited overvoltage and overcurrent tolerance and the difficulty of self-eliminating DC short-circuit faults. High-voltage DC transmission projects usually use conventional DC LCC (Line-commuted Converter) technology. However, the probability of commutation failure in LCC technology is high in conventional DC transmission systems. Continuous commutation failures cause a large drop in power, which will pose a serious threat to the safe and stable operation of the power grid. The reason for the commutation failure is that LCC technology uses semi-controlled thyristor devices, that is, the thyristor cannot be turned off in a controllable manner. When the AC fault causes a voltage drop, the thyristor does not have enough reverse recovery time to turn on again. When a DC system fails, it does not have the ability to block the current.

[0003] To this end, the relevant technical solutions began to use the hybrid commutated converter valve HCC (Hybrid Commuted Converter) technology based on IGCT (Integrated Gate-Commutated Thyristor) devices, which can achieve controlled conduction and active shutdown, achieve reliable commutation, and reduce the risk of conventional DC commutation failure. However, the consistency of IGCT devices is difficult to guarantee, which is a defect of IGCT itself. This defect will affect the performance of the hybrid commutated converter valve, affect the commutation, and even damage the converter valve. Summary of the invention

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

[0005] In order to solve the above technical problems, the present application provides a valve assembly of a hybrid commutation valve based on IGCT, comprising a valve assembly, wherein 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, wherein the radiator row comprises a plurality of radiators arranged in sequence along the first direction; each of the gate commutation thyristors is clamped between two adjacent radiators;

[0006] The valve assembly also includes a lightning arrester assembly, which includes a lightning arrester unit, each of which includes a lightning arrester or a plurality of lightning arresters connected in parallel; each of the lightning arrester units is connected to two adjacent radiators in the radiator row to be connected in parallel with the gate-commutated thyristor between the two adjacent radiators, and each of the gate-commutated thyristors is connected in parallel with a corresponding lightning arrester unit.

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

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

[0009] Optionally, the valve assembly comprises a driver row, the driver row comprises a plurality of drivers sequentially arranged along the first direction, the drivers and the gate-commutated thyristors are arranged in one-to-one correspondence, and the drivers are used to drive the corresponding gate-commutated thyristors;

[0010] The driver row, the radiator row, and the lightning arrester assembly are arranged in sequence along the second direction.

[0011] Optionally, the arrester assembly includes a connection assembly, and each arrester unit matches one connection assembly;

[0012] The connection assembly includes two connection pieces, and the arrester unit is connected to one of the two adjacent radiators through one of the connection pieces, and is connected to the other of the two adjacent radiators through the other connection piece.

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

[0014] Optionally, one of the connectors of one of the arrester units in one of the arrester unit rows and one of the connectors of one of the arrester units in another adjacent arrester unit row are both directly connected to the same radiator and connected at two different positions on the radiator distributed along the third direction.

[0015] Optionally, the lightning arrester assembly also includes a plurality of connection structures connected one-to-one to the plurality of heat sinks; a connecting member of a lightning arrester unit in one lightning arrester unit row and a connecting member of a lightning arrester unit in another adjacent lightning arrester unit row are both connected to the same connection structure.

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

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

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

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

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

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

[0022] Optionally, the arrester assembly further includes a second support frame, the second support frame includes a second support plate, the thickness direction of the second support plate is parallel to the second direction, and the plurality of rows of arrester units are mounted on the second support plate.

[0023] Optionally, the connecting assembly further comprises a connecting shaft, the connecting shaft passes through one of the lightning arresters, and the connecting shaft is connected to the two connecting members.

[0024] The valve assembly of the IGCT-based hybrid commutation valve in the present application can achieve reliable commutation through active shutdown of the gate commutation thyristor, reduce the risk of conventional DC commutation failure, and adopts a lightning arrester unit and a gate commutation thyristor connection method, so that it has the advantages of large current, high withstand voltage, low conduction voltage drop, etc., and is suitable for ultra-high voltage (above 500kv, such as 800kv) DC transmission applications. The lightning arrester unit has the advantages of low residual voltage, fast response, small discreteness, and nonlinearity. The setting of the lightning arrester unit can reduce or even eliminate the problems caused by the difficulty in ensuring the consistency of IGCT devices, thereby effectively solving the problem of dynamic voltage balancing of hundreds of devices in series, and also has a good protection effect on each IGCT device.

[0025] The present application also provides a hybrid phase-changing flow control valve based on IGCT, including a valve assembly as described in any one of the above items, and having the same technical effect as the above valve assembly. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0027] Figure 2 for Figure 1 A partial enlarged schematic diagram of the A part;

[0028] Figure 3 for Figure 2 A partial enlarged schematic diagram of the B part;

[0029] Figure 4 1 is a schematic diagram of the structure in which the valve assembly and the capacitor are installed on two side beams of the frame;

[0030] Figure 5 for Figure 4 A partial enlarged schematic diagram of the middle C part;

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

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

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

[0034] Fig. 9 This is a schematic structural diagram of a hybrid phase-commutation valve in the second embodiment of the present application;

[0035] Fig.10 for Fig. 9Schematic diagram of the structure in which the middle valve assembly and the capacitor are installed on two side beams of the frame;

[0036] Fig.11 for Fig.10 Schematic diagram of the structure of the arrester assembly;

[0037] Fig.12 for Fig.11 A schematic diagram of the structure of the arrester assembly from another perspective;

[0038] Fig.13 for Fig.11 A structural schematic diagram of a connection between a connecting member and a connecting structure;

[0039] Fig.14 This is a schematic diagram of the structure of a hybrid phase-commutation valve in the third embodiment of the present application.

[0040] The following are the descriptions of the reference numerals:

[0041] 10-frame; 101-side beam; 102-cross beam;

[0042] 20- Reactor;

[0043] 30-valve assembly;

[0044] 301-lightning arrester assembly; 3011-lightning arrester unit; 30111-connecting piece; 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-lightning arrester; 30113-connecting shaft; 3 012-first support frame; 30121-first support plate; 30121a-weight reduction hole; 30122-first support seat; 30123-second support seat; 3013-second support frame; 30131-second support plate; 30132-third support seat; 3014-connection structure; 30141-first structural member; 30141a-connection hole; 30142-second structural member; 3015-fastener;

[0045] 302- Radiator;

[0046] 303-pressing mechanism;

[0047] 304-Rod resistor;

[0048] 305-integrated gate commutated thyristor; 3051-gate commutated thyristor; 3052-driver;

[0049] 40-capacitor;

[0050] 50-Cooling pipeline;

[0051] 60-Shielding cover. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In the embodiments of the present application, the terms "first", "second", and "third" are only used to distinguish the same or similar technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0053] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a hybrid phase-changing flow control valve in the first embodiment of the present application.

[0054] The hybrid commutation valve in this embodiment includes a valve assembly 30 , a reactor 20 , a cooling pipeline 50 , a capacitor 40 and a shielding cover 60 . The cooling pipeline 50 can cool and dissipate heat for the valve assembly 30 and the reactor 20 . Figure 1 In the figure, the hybrid phase-changing valve also includes a frame 10, and the above-mentioned valve assembly 30, reactor 20, cooling pipeline 50 and capacitor 40 are all installed on the frame 10. The frame 10 may include two side beams 101 and multiple cross beams 102 located between the two side beams 101. The valve assembly 30, reactor 20, etc. can be fixed to the corresponding cross beams 102 according to the layout selection. 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 includes the cross beam 102 and the side beam 101, the structure is simpler, the weight is lighter, and it is also convenient for the layout of the line. In addition, in this embodiment, the valve assembly 30 and the corresponding capacitor 40 are distributed along the second direction Y to form a group of electrical components. The hybrid phase-changing valve may include two groups of electrical components, and the two groups of electrical components are distributed along the first direction X. The first direction X is perpendicular to the second direction Y, and the inductor 20 is provided at both ends of the two groups of electrical components along the first direction X. Two inductors 20 are arranged at each end, and the two inductors 20 are also distributed along the second direction Y. This arrangement is relatively compact.

[0055] Look again Figures 2 to 5 understand, Figure 2 for Figure 1 A partial enlarged schematic diagram of the A part; Figure 3 for Figure 2 A partial enlarged schematic diagram of the B part; Figure 4 1 is a schematic diagram of the structure in which the valve assembly 30 and the capacitor 40 are installed on two side beams 101 of the frame 10; Figure 5 for Figure 4 A partial enlarged schematic diagram of the C area in the middle.

[0056] The valve assembly 30 in this embodiment includes a thyristor row, which includes a plurality of integrated gate-commutated thyristors 305 arranged in sequence along a first direction X. The integrated gate-commutated thyristor 305 is an IGCT (Integrated Gate-Commutated Thyristor) device. The integrated gate-commutated thyristor 305 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, which is used to drive the gate-commutated thyristor 3051. Figure 2 It can be seen that 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 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 further includes a radiator row corresponding to the thyristor row, and the radiator row includes a plurality of radiators 302 arranged in sequence along the first direction X, and a rod-shaped resistor 304 can be plugged into the radiator 302. Figure 2 As shown, each gate-commutated thyristor 3051 in the thyristor row is clamped between two adjacent heat sinks 302, which can also be understood as multiple gate-commutated thyristors 3051 and multiple heat sinks 302 are alternately arranged in sequence along the first direction X. In order to ensure the contact between the gate-commutated thyristors 3051 and the heat sink 302, a pressing mechanism 303 is further provided to press the multiple gate-commutated thyristors 3051 and the heat sink 302 along the first direction X. The coolant of the cooling pipeline 50 can flow through the heat sink 302, so that the gate-commutated thyristors 3051 between two adjacent heat sinks 302 can be cooled and dissipated. The arrangement of the cooling pipeline 50 is various, which will not be discussed in detail in this embodiment.

[0058] The valve assembly 30 in this embodiment further includes a lightning arrester assembly 301, and each thyristor row is matched with a lightning arrester assembly 301, such as Figure 2 , 4 As shown, the arrester assembly 301 and the heat sink row are arranged along the second direction Y. The arrester assembly 301 includes a plurality of arrester units 3011, each arrester unit 3011 includes at least one arrester 30112, Figure 4Each lightning arrester unit 3011 shown in the figure includes two lightning arresters 30112. Obviously, when the number of lightning arresters 30112 in the lightning arrester unit 3011 is multiple (i.e., two or more than two), the multiple lightning arresters 30112 in the lightning arrester unit 3011 are arranged in parallel. Each lightning arrester unit 3011 is connected to two adjacent radiators 302 in the radiator row to be connected in parallel with the gate commutation thyristor 3051 between the two adjacent radiators 302. In this way, each gate commutation thyristor 3051 is connected in parallel with a corresponding lightning arrester unit 3011. That is, the lightning arrester unit 3011 and the gate commutation thyristor 3051 of the valve assembly 30 in this embodiment are connected in a "one-to-one" pairing manner.

[0059] The hybrid commutation valve in this embodiment can realize reliable commutation through active shutdown of the integrated gate commutation thyristor 305, eliminate the risk of conventional DC commutation failure, and adopts a lightning arrester unit 3011 and a gate commutation thyristor 3051 connected in one, so that it has the advantages of large current, high withstand voltage, low conduction voltage drop, etc., and is suitable for ultra-high voltage (such as 800kv) DC transmission applications. The lightning 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 has a good protection effect on each device.

[0060] As mentioned above, the radiator row and the lightning arrester assembly 301 in this embodiment can be arranged along the second direction Y. It is worth noting that the lightning arrester assembly 301 in this embodiment can include at least two rows of lightning arrester unit rows distributed along the third direction Z, each row of lightning arrester unit rows includes at least two lightning arrester units 3011, and the multiple lightning arrester units 3011 of each row of lightning arrester unit rows are arranged along the first direction X. Among them, 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 phase-changing valve.

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

[0062] The third direction Z is Figure 6 , 7 In the up and down direction, that is, the multiple lightning arrester units 3011 of the lightning arrester assembly 301 in this embodiment can be distributed in groups up and down, for example Figure 6 , 7The arrangement shown is two rows, one above the other. The number of arrester units 3011 in each row can be arranged relatively evenly. In this embodiment, eleven gate-commutated thyristors 3051 are arranged in total, and the number of arrester units 3011 is also eleven. The number of arrester units 3011 in the two rows can be five and six respectively. Of course, the number of integrated gate-commutated thyristors 305 and arrester units 3011 can also be other values. For example, for a small-component hybrid phase-commutated commutation valve, the number of integrated gate-commutated thyristors 305 and arrester units 3011 can be 6-9. For a large-component hybrid phase-commutated commutation valve, the number of integrated gate-commutated thyristors 305 and arrester units 3011 can be 10-14, or other numbers. This embodiment does not impose specific restrictions. For setting two rows of arrester units 3011, when the number of arrester units 3011 is an even number, the number of arrester units 3011 in the two rows can be equal, and when the number of arrester units 3011 is an odd number, the number of arrester units 3011 in the two rows can differ by one. It can be understood that more than two rows of arrester units 3011 can also be set, which can be set according to specific needs.

[0063] The plurality of lightning arrester units 3011 are arranged in groups along the third direction Z, so that it is convenient to connect the plurality of lightning arrester units 3011 with the corresponding heat sinks 302 , thereby shortening the connection path between the lightning arrester units 3011 and the heat sinks 302 .

[0064] Can be combined Figure 3 , 4 It is understood that the heat sink 302 is generally a thinner rectangular structure. The heat sink 302 has a large surface with the largest area. Multiple heat sinks 302 are arranged in a manner in which the large surfaces are opposite to each other. The gate-commutated thyristor 3051 is also clamped between the large surfaces of two heat sinks 302, which is conducive to increasing the contact area with the heat sink 302 to improve the cooling and heat dissipation effect.

[0065] At this time, the dimension of the side of the heat sink 302 facing the 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, the surface can be defined as the small face of the radiator 302, and the arrester 30112 is a roller structure, that is, a cylindrical structure, and its radial dimension or axial dimension is larger than the thickness of the small face of the radiator 302. In this embodiment, the length of the arrester 30112 along the axial direction is L2, and the spacing between the center lines of the small faces of two adjacent radiators 302 extending along the second direction Y is L1, and L2 is generally greater than L1. At this time, if each arrester unit 3011 is arranged along the first direction X, the length of the arrangement will be greater than the length of the radiator row, and some arrester units 3011 are farther away from the corresponding radiator 302. If all the arrester units 3011 are arranged in a row along the second direction Y, or all the arrester units 3011 include multiple rows of arrester units arranged along the first direction X, and each row of arrester units is arranged along the second direction Y, that is, the arrester units 3011 are arranged in the XY plane, then there must be some arrester units 3011 that are far away from the corresponding radiator 302. The distance between the arrester unit 3011 and the corresponding radiator 302 is far, which will result in a longer connection path, so that some connection paths are short and some paths are long. In this embodiment, the arrester units 3011 are distributed along the third direction Z, that is, distributed along the height direction of the radiator 302, so that the arrester units 3011 are easier to connect to the corresponding radiator 302 with a shorter path, thereby giving the circuit a low stray inductance and improving the power of the hybrid commutation valve.

[0066] In addition, if Figure 2 , 4 As shown, the plurality of drivers 3052 in this embodiment are arranged along the first direction X to form a driver row, and the driver row, the heat sink row, and the lightning arrester assembly 301 are arranged in sequence along the second direction Y. That is, compared with the driver row, the heat sink row is closer to the lightning arrester assembly 301, so that when the lightning arrester assembly 301 is connected to the heat sink row, it is not necessary to bypass the driver row, which can be more conducive to shortening the connection path. Figure 3 In the embodiment, the lightning arrester unit 3011 and the heat sink 302 have a distance L3 in the second direction Y. When the lightning arrester unit 3011 and the corresponding heat sink 302 are connected, there is no 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 structural diagram of the connection assembly of the arrester assembly 301.

[0068] The arrester assembly 301 in this embodiment also includes a connection assembly, and each arrester unit 3011 matches a connection assembly. The connection assembly includes two connectors 30111, and the connector 30111 can be a copper bar structure. The arrester unit 3011 is connected to one of the two adjacent radiators 302 through one connector 30111, and is connected to the other of the two adjacent radiators 302 through another connector 30111. In this way, the arrester unit 3011 and the gate-commutated thyristors 3051 between the two adjacent radiators 302 can be connected in parallel, and the connection is simple and reliable.

[0069] Specifically, the structures of the two connecting members 30111 in each connecting assembly can be the same, such as Figure 8 As shown, and symmetrically arranged along the radial midline of the arrester 30112, the radial midline is parallel to the second direction Y. In this embodiment, when the arrester assembly 301 is arranged, the axis of the arrester 30112 is parallel to the first direction X, then the two connectors 30111 are respectively connected to the two axial ends of the arrester 30112, when the number of the arrester 30112 in the arrester unit 3011 is more than one, the multiple arresters 30112 are arranged along the second direction Y, and each connector 30111 can be connected to the axial ends of the multiple arresters 30112 in the arrester unit 3011 at the same side at the same time, so as to realize the parallel connection of the multiple arresters 30112 in the arrester unit 3011. The connectors 30111 at both ends of each arrester unit 3011 are set to the same structure, so that the processing is more convenient, and only one structure of the connector 30111 needs to be processed. Of course, the structures of the two connectors 30111 in the connecting assembly can be set to different ones.

[0070] In addition, each connecting assembly may further include a connecting shaft 30113, the connecting shaft 30113 connecting two connecting pieces 30111, and the connecting shaft 30113 passes through the arrester 30112, so that the arrester 30112 and the two connecting pieces 30111 at both ends can be connected. When the number of arresters 30112 in the arrester unit 3011 is multiple, a corresponding number of connecting shafts 30113 are provided, and each connecting shaft 30113 is connected to two connecting pieces 30111 at the same time. The connecting shaft 30113 may, for example, have a threaded section, and after passing through the connecting piece 30111, it may be fixed by a nut. The connecting shaft 30113 is provided to facilitate the assembly of the connecting assembly and the arrester 30112, to achieve a modular design, a simple and compact structure, and can improve the anti-seismic performance, a reasonable structure, and is convenient for maintenance and installation.

[0071] In this embodiment, except for the two most edge heat sinks 302 distributed along the first direction X in the heat sink row (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 a connector 30111 of two lightning arrester units 3011 at the same time, and one of the connectors 30111 of the two lightning arrester units 3011 can be directly connected to the same heat sink 302. At this time, one connector 30111 of each of the two lightning arrester units 3011 can be connected to two different positions of the heat sink 302 distributed along the third direction Z. Figure 5 From the perspective, it can be seen that the upper and lower parts of a heat sink 302 are respectively connected to a different lightning arrester unit 3011.

[0072] Figure 8 In the embodiment, each connecting member 30111 includes a first connecting portion 30111a and a second connecting portion 30111b, and the first connecting portion 30111a is a long strip structure extending along the second direction Y to simultaneously connect the axial ends of the same side of the two lightning arresters 30112. The second connection portion 30111b specifically includes a first connection segment 30111b1, a second connection segment 30111b2 and a third connection segment 30111b3. The first connection segment 30111b1 and the third connection segment 30111b3 are arranged substantially in parallel and substantially parallel to the first direction X. The second connection segment 30111b2 transitionally connects the first connection segment 30111b1 and the third connection segment 30111b3. The second connection segment 30111b2 is substantially perpendicular to the first connection segment 30111b1 and the third connection segment 30111b3. The second connection segment 30111b2 is substantially parallel to the second direction Y, that is, the second connection portion 30111b is substantially a U-shaped structure. The third connection segment 30111b3 is connected to the first connection portion 30111a. The first connection segment 30111b1 is provided with a connection hole ( Figure 8 ), such as Figure 5 As shown, the fastener 3015 inserted into the connection hole can be connected to the corresponding heat sink 302. Projected along the second direction Y, the projection of the first connection section 30111b1 coincides with the projection of the lightning arrester 30112, so that the space occupied by the first connection section 30111b1 in the first direction X can be reduced. Of course, the second connection portion 30111b is not limited to a U-shaped structure, for example, it can also be an L-shaped structure. The width dimension of the first connection section 30111b1 along the first direction X can be roughly equal to the width of the lightning arrester 30112 along the first direction X, so as to maximize the connection contact area and ensure the mechanical and electrical connection effects.

[0073] In addition, if Figure 6As shown, in order to reduce space occupation, the upper and lower rows of lightning arrester units 3011 need to be arranged as compactly as possible. When projected along the third direction Z, the projections of the multiple lightning arresters 30112 of one row of lightning arrester units 3011 and another adjacent row of lightning arrester units 3011 will not be completely staggered, such as Figure 3 As shown, the projections of the lightning arrester units 3011 in the upper row and the lightning arrester units 3011 in the next row in the third direction Z are staggered and overlapped, and the length of the overlapping part between a lightning arrester unit 3011 in one row and a lightning arrester unit 3011 in another adjacent row in the first direction X is S.

[0074] In detail, we can Figure 3 , 6 The eleven lightning arrester units 3011 are marked as the Ath lightning arrester unit 3011 to the Kth lightning arrester unit 3011, the upper row is the Ath lightning arrester unit 3011 to the Eth lightning arrester unit 3011, and the lower row is the Fth lightning arrester unit 3011 to the Kth lightning arrester unit 3011. It can be seen that since the number of lightning arrester units 3011 is odd, except that the Kth lightning arrester unit 3011 only partially overlaps with the Ath lightning arrester unit 3011 and the Eth lightning arrester unit 3011 only partially overlaps with the Fth lightning arrester unit 3011, the remaining lightning arrester units 3011 all partially overlap with two adjacent lightning arrester units 3011 in another row, and the length S of the overlapping part along the first direction X is 2 (L2-L1).

[0075] As mentioned above, except for the two radiators 302 at the edge, the remaining radiators 302 need to be connected to the connectors 30111 of the two lightning arrester units 3011 at the same time. If two adjacent lightning arrester units 3011 in the same row are connected to the same radiator 302, and the two connectors 30111 are connected to the same height position of the radiator 302, interference is likely to occur, or it is difficult to ensure the connection area. In this embodiment, a connector 30111 of a lightning arrester unit 3011 in one lightning arrester unit row and a lightning arrester unit 3011 in another adjacent lightning arrester unit row are connected to the same radiator 302. Figure 5 , 6 As shown, the two connectors 30111 of each arrester unit 3011 can be defined as a first connector and a second connector, respectively. The first connector is located at one axial end of the arrester unit 3011, and the second connector is located at the other axial end of the arrester unit 3011. The twelve heat sinks 302 can be marked as the ath heat sink 302 to the lth heat sink 302, then the first connector of the Ath arrester unit 3011 and the second connector of the Kth arrester unit 3011 are roughly opposite in the third direction Z, and can connect the corresponding lth heat sink 302 at different positions in the third direction Z, such as Figure 5 As shown; for another example, the second connecting member of the Ath lightning arrester unit 3011 and the first connecting member of the Jth lightning arrester unit 3011 are roughly opposite to 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.

[0076] In this embodiment, the length of the first connecting section 30111b1 extending in the first direction may be equal to the thickness W of the heat sink 302, that is, the entire first connecting section 30111b1 may be completely in contact with the heat sink 302 in the first direction. Figure 5 As shown, this helps to increase the contact area with the heat sink 302 to achieve reliable mechanical and electrical connection.

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

[0078] At this time, the arrester assembly 301 further includes a first support frame 3012, which includes a plurality of first support plates 30121 distributed along the third direction Z, and the thickness direction of each first support plate 30121 is parallel to the third direction Z; each group of arrester units 3011 is supported on a first support plate 30121. Figure 8 As shown, the connecting member 30111 further includes a third connecting portion 30111c, and the connecting member 30111 can be fixed to the first support plate 30121 through the third connecting portion 30111c. The third connecting portion 30111c is provided with a connecting hole 30111c1, for example, and can be connected and fixed to the first support plate 30121 through a fastener passing through the connecting hole 30111c1. The third connecting portion 30111c can extend from the first connecting portion 30111a along the third direction Z for a distance and then extend to another connecting member 30111. The third connecting portion 30111c can be an L-shaped structure, which can be referred to Figure 7 Each connecting member 30111 may be provided with two third connecting portions 30111 c along the second direction Y to improve the reliability of the connection with the first supporting plate 30121 .

[0079] like Figure 6 As shown, the first support frame 3012 of the arrester assembly 301 in this embodiment also includes a support seat, specifically including Figure 6The first support seat 30122 and the second support seat 30123 in the embodiment of the present invention are as follows: the first support plate 30121 located on the upper side is fixed to the frame 10 through the first support seat 30122, and the first support plate 30121 located on the lower side is fixed to the frame 10 through the second support seat 30123. The first support seat 30122 is specifically a U-shaped bracket, and the second support seat 30123 is specifically an L-shaped bracket. Of course, the structural form of the support seat is not limited. The structural form of the first support frame 3012 is not limited, as long as it can support multiple lightning arrester units 3011 and can be supported and 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 further provided with a weight-reducing hole 30121a to reduce the mass of the hybrid phase-changing flow control valve.

[0081] Please continue to refer to Figures 9 to 12 understand, Fig. 9 This is a schematic structural diagram of a hybrid phase-commutation valve in the second embodiment of the present application; Fig.10 for Fig. 9 A schematic diagram of the structure in which the middle valve assembly 30 and the capacitor 40 are installed on two side beams 101 of the frame 10; Fig.11 for Fig.10 A schematic structural diagram of the middle arrester assembly 301; Fig.12 for Fig.11 A schematic structural diagram of the middle arrester assembly 301 from another perspective.

[0082] The structure of the hybrid phase-changing valve in this embodiment is basically the same as that of the hybrid phase-changing valve in the first embodiment mentioned above. The difference is that the connection form of the lightning arrester unit 3011 and the radiator 302 in the second embodiment is slightly different. In the first embodiment, the two connectors 30111 of the connecting assembly in the lightning arrester assembly 301 are directly connected to the corresponding radiator 302, while in the second embodiment, the two connectors 30111 of the connecting assembly are connected to the radiator 302 through the corresponding connecting structure 3014, that is, the radiator 302 has only one connection position, and the connecting structure 3014 can be a copper busbar structure.

[0083] In the second embodiment, the arrester assembly 301 also includes a plurality of connection structures 3014 connected to the plurality of radiators 302 in a one-to-one correspondence, and a connection member 30111 of a lightning arrester unit 3011 and a connection member 30111 of another lightning arrester unit 3011 are both connected to the same connection structure 3014. The two connection members 30111 corresponding to each lightning arrester unit 3011 are also identical in structure, and are symmetrically arranged relative to the radial midline of the lightning arrester 30112. Similarly, the two connection members of each lightning arrester unit 3011 are defined as a first connection member and a second connection member, then the first connection member of a lightning arrester unit 3011 in one row and the second connection member of another lightning arrester unit 3011 in another row are simultaneously connected to a connection structure 3014, and are connected to the same radiator 302 through the connection structure 3014.

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

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

[0086] At this time, the connection structure 3014 includes a first structural member 30141 extending along the third direction Z. The first structural member 30141 is a long strip structure, and its two ends are respectively provided with connection holes 30141a, which are used to connect with a first connection member in a row of lightning arrester units 3011 and a second connection member in another row of lightning arrester units 3011. The connection structure 3014 also includes a second structural member 30142, which can be an L-shaped structural member. The second structural member 30142 includes a first part extending along the second direction Y and a second part extending along the first direction X. The first part connects the first structural member 30141 and the second part, and the second part can be used to connect with the radiator 302. The length of the second part extending along the first direction X is, for example, equal to the thickness W of the radiator 302. In addition, the connection member 30111 at this time is roughly a cross-shaped structure, so as to take into account the connection of two lightning arresters 30112 arranged along the third direction Z and the connection with the connection structure 3014.

[0087] At this time, if Fig.11 , 12As shown, the lightning arrester assembly 301 in this embodiment also includes a second support frame 3013, and 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. The plurality of lightning arrester units 3011 are all mounted on the second support plate 30131. The above-mentioned connecting member 30111 is a cross-shaped structure, and the portion extending along the second direction Y can be provided with a connecting hole to be connected and fixed with the second support plate 30131. The second support frame 3013 can be specifically an L-shaped plate, and the portion extending along the third direction Z is the second support plate 30131, and the other portion is perpendicular to the second support plate 30131, and both portions can be fixed by the third support seat 30132 and the frame 10.

[0088] It should be understood that when there are more than one arrester 30112 in the arrester unit 3011 in the first embodiment, they are arranged along the second direction Y, which is the first arrangement mode, and the connector 30111 of each arrester unit 3011 is directly connected to the radiator 302; when there are more than one arrester 30112 in the arrester unit 3011 in the second embodiment, they are arranged along the third direction Z, which is the second arrangement mode, and the connector 30111 of each arrester unit 3011 is connected to the radiator 302 through a connecting structure 3014. Obviously, whether it is the first arrangement mode or the second arrangement mode, 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 lightning arresters 30112 in the lightning arrester unit 3011 and the radiator 302 in the second direction Y is not the same, so the length of the connection path from the lightning arrester 30112 in the same lightning arrester unit 3011 to the radiator 302 is different; while in the second arrangement, the length of the connection path between the two lightning arresters 30112 in the lightning arrester unit 3011 and the radiator 302 is basically the same, so the uniformity of the electrical connection of the second arrangement will be better. However, the first arrangement is conducive to reducing the height of the hybrid phase-commutation valve.

[0090] In addition, in the above-mentioned first embodiment, each lightning arrester unit 3011 is directly connected to the radiator 302 through its own two connecting parts 30111, and can be directly connected to the radiator 302 along the second direction Y, so that it is connected to different positions of the radiator 302 in the third direction Z, and the connection path is shorter; in the second embodiment, since the lightning arresters 30112 in the lightning arrester unit 3011 are distributed along the third direction Z, the height is relatively high, which may be higher than the radiator 302. In this way, the connecting part 30111 directly extending along the second direction Y may not be able to connect to the radiator 302, so it can be connected to the radiator 302 through the connecting structure 3014, and only one connecting position is set on the radiator 302.

[0091] When the hybrid phase-changing valve with the arrester unit 3011 distributed along the third direction Z is simulated, a lower stray inductance can be obtained. For example, in the first embodiment, the stray inductance can be controlled at 117nH. If the arrester unit 3011 in the first embodiment adopts the connection method of the connection structure 3014, the stray inductance is still at a low level, but due to the increase in the connection path, the stray inductance will increase to 333nH relatively speaking; in the second embodiment, the stray inductance can be controlled at 204nH. If the arrester unit 3011 in the second embodiment is directly connected to the radiator 302, the connection path will still be greater than the connection path in the first embodiment, and the stray inductance is 205nH. However, no matter which setting method is used, the stray inductance is relatively low.

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

[0093] The structure of the third embodiment can be understood with reference to the first and second embodiments, except that the hybrid phase-changing valve in the third embodiment is provided 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 arranged between the two groups of electrical components, and the cooling pipeline 50 is adaptively adjusted in direction, that is, the number and position of the reactor 20 can be adjusted according to demand. The arrangement of the valve assembly 30 can be the same as that of the above-mentioned embodiment, and the technical effect can be understood with reference, and will not be repeated.

[0094] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A valve assembly of a hybrid commutation valve based on IGCT, characterized in that: The valve assembly (30) comprises a plurality of gate commutation thyristors (3051) arranged in sequence along a first direction (X), and the valve assembly (30) further comprises a heat sink row, wherein the heat sink row comprises a plurality of heat sinks (302) arranged in sequence along the first direction (X); each of the gate commutation thyristors (3051) is clamped between two adjacent heat sinks (302); The valve assembly (30) further comprises a lightning arrester assembly (301), wherein the lightning arrester assembly (301) comprises a lightning arrester unit (3011), and each of the lightning arrester units (3011) comprises one lightning arrester (30112) or a plurality of lightning arresters (30112) connected in parallel; each of the lightning arrester units (3011) is connected to two adjacent heat sinks (302) in the heat sink row, so as to be connected in parallel with the gate commutation thyristor (3051) between the two adjacent heat sinks (302), and each of the gate commutation thyristors (3051) is connected in parallel with a corresponding lightning arrester unit (3011).

2. The valve assembly of the IGCT-based hybrid commutation valve according to claim 1, characterized in that: The radiator row and the lightning arrester assembly (301) are arranged along a second direction (Y), and the second direction (Y) is perpendicular to the first direction (X); The lightning arrester assembly (301) comprises at least two rows of lightning arrester units distributed along a third direction (Z), wherein the third direction (Z) and the first direction (X) and the second direction (Y) are mutually perpendicular; each of the lightning arrester unit rows comprises at least two lightning arrester units (3011), and the plurality of lightning arrester units (3011) of each lightning 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) comprises a driver row, the driver row comprising a plurality of drivers (3052) arranged in sequence along the first direction (X), the drivers (3052) and the gate-commutated thyristors (3051) being arranged in one-to-one correspondence, and the drivers (3052) being used to drive the corresponding gate-commutated thyristors (3051); The driver row, the radiator row, and the lightning arrester assembly (301) are arranged in sequence along the second direction (Y).

4. The valve assembly of the IGCT-based hybrid commutation valve according to claim 3, characterized in that: The lightning arrester assembly (301) comprises a connection assembly, and each of the lightning arrester units (3011) matches one of the connection assemblies; The connection assembly comprises two connecting pieces (30111); the arrester unit (3011) is connected to one of the two adjacent radiators (302) via one of the connecting pieces (30111), and is connected to the other of the two adjacent radiators (302) via the other of the connecting pieces (30111).

5. The valve assembly of the IGCT-based hybrid commutation valve according to claim 4, characterized in that: The axis of the lightning arrester (30112) is parallel to the first direction (X), the two connecting members (30111) in each connecting assembly have the same structure, and the two connecting members (30111) are symmetrically arranged along the radial center line of the lightning arrester (30112), and the radial center line 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 connecting piece (30111) of a lightning arrester unit (3011) in one of the lightning arrester unit rows, and a connecting piece (30111) of a lightning arrester unit (3011) in another adjacent lightning arrester unit row, are both directly connected to the same radiator (302), and are connected at two different positions of the radiator (302) distributed along the third direction (Z).

7. The valve assembly of the IGCT-based hybrid commutation valve according to claim 4, characterized in that: The lightning arrester assembly (301) further comprises a plurality of connection structures (3014) connected to the plurality of heat sinks (302) in a one-to-one correspondence; a connection piece (30111) of a lightning arrester unit (3011) in one of the lightning arrester unit rows and a connection piece (30111) of a lightning arrester unit (3011) in another adjacent lightning arrester unit row are both connected to the same connection structure (3014).

8. The valve assembly of the hybrid commutation valve based on IGCT according to any one of claims 2 to 7, characterized in that: Projected along the third direction (Z), two adjacent 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 lightning arrester (30112) is parallel to the first direction (X), satisfying: S=2(L2-L1); Wherein, L1 is the distance between the midlines of two adjacent heat sinks (302) extending along the second direction (Y), L2 is the axial length of the lightning arrester (30112), and S is the length of the overlapping portion along the first direction (X).

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

11. The valve assembly of the IGCT-based hybrid commutation valve according to claim 10, characterized in that: The lightning arrester assembly (301) further comprises a first support frame (3012), the first support frame (3012) comprising 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); and each row of the lightning arrester units (3011) is supported on one of the first support plates (30121).

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

13. The valve assembly of the IGCT-based hybrid commutation valve according to claim 12, characterized in that: The lightning arrester assembly (301) further comprises a second support frame (3013), the second support frame (3013) comprises a second support plate (30131), the thickness direction of the second support plate (30131) is parallel to the second direction (Y), and the plurality of rows of lightning arrester units (3011) are all mounted on the second support plate (30131).

14. The valve assembly of the IGCT-based hybrid commutation valve according to any one of claims 4 to 7, characterized in that: The connection assembly further comprises a connection shaft (30113), wherein the connection shaft (30113) passes through one of the lightning arresters (30112), and the connection shaft (30113) is connected to the two connection members (30111).

15. Hybrid phase-changing valve, characterized in that: A valve assembly comprising a hybrid commutation valve based on IGCT as described in any one of claims 1-14.

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