IGCT converter valve assembly

Abstract

The invention provides an IGCT (integrated gate commutated thyristor) converter valve assembly, which comprises a plurality of integrated gate commutated thyristors arranged at intervals along a first direction; the plurality of first heat dissipation pieces are arranged at intervals, an integrated gate commutated thyristor is arranged between every two adjacent first heat dissipation pieces in an attached mode, and the first heat dissipation pieces are in conductive fit with the integrated gate commutated thyristors; a plurality of lightning arresters, wherein the plurality of lightning arresters and the plurality of integrated gate commutated thyristors are arranged at intervals along a second direction; a lightning arrester is arranged between every two adjacent second heat dissipation pieces in an attached mode, and the second heat dissipation pieces are in conductive fit with the lightning arresters; the press-fitting assembly is used for pressing the plurality of lightning arresters and the plurality of second heat dissipation pieces; and the conducting bars are used for conductively connecting the first heat dissipation piece with the second heat dissipation piece. According to the invention, the problem that the continuous active turn-off operation capability of the IGCT converter valve is poor due to the lightning arrester in the related technology is solved.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and more specifically, to an IGCT converter valve assembly. Background Technology

[0002] In high-voltage direct current (HVDC) transmission systems, the IGCT converter valve is a critical piece of equipment, and its operational reliability and performance directly affect the stability and efficiency of the entire power grid. IGCT stands for Integrated Gate-Commutated Thyristor. The surge arrester within the IGCT converter valve assembly is a vital protective component ensuring the safe operation of the power system under transient overvoltage conditions. Surge arresters primarily undertake the task of protecting against transient overvoltages in power systems, a task often accompanied by the absorption of significant amounts of energy. When a surge arrester absorbs overvoltage energy, the energy is converted into heat. If this heat cannot be dissipated effectively and promptly, it will accumulate inside the surge arrester, affecting its performance and lifespan.

[0003] However, surge arrester designs in related technologies often focus on low protection levels or low voltage ratios to ensure rapid response under overvoltage conditions, improve the shut-off stress of the IGCT converter valve, and enhance voltage limiting effectiveness. However, the characteristics of low protection level, low voltage ratio, and high energy of surge arresters are difficult to simultaneously satisfy, resulting in a relatively low energy handling capacity. This means that when surge arresters bear commutation energy, the accumulated energy cannot be dissipated, making them prone to performance degradation or damage due to energy overload. Consequently, the continuous active shut-off capability of the IGCT converter valve is poor, leading to a weaker ability to withstand commutation failures.

[0004] Therefore, the surge arrester in the relevant technology results in poor continuous active shut-off capability of the IGCT converter valve. Summary of the Invention

[0005] The main objective of this invention is to provide an IGCT converter valve assembly to solve the problem that surge arresters in related technologies result in poor continuous active shut-off capability of IGCT converter valves.

[0006] To achieve the above objectives, the present invention provides an IGCT converter valve assembly, comprising: a plurality of integrated gate commutator thyristors, the plurality of integrated gate commutator thyristors being spaced apart along a first direction; a plurality of first heat sinks, the plurality of first heat sinks being spaced apart, an integrated gate commutator thyristor being fitted between adjacent two first heat sinks, the first heat sinks being electrically connected to the integrated gate commutator thyristors; a plurality of surge protectors, the plurality of surge protectors being spaced apart from the plurality of integrated gate commutator thyristors along a second direction, the second direction being at an angle to the first direction; a plurality of second heat sinks, the plurality of second heat sinks being spaced apart, a surge protector being fitted between adjacent two second heat sinks, the second heat sinks being electrically connected to the surge protectors; a press-fitting assembly for press-fitting the plurality of surge protectors and the plurality of second heat sinks; and a plurality of conductive bars, the conductive bars electrically connecting the first heat sinks and the second heat sinks.

[0007] Furthermore, the second heat dissipation component is a radiator, and the radiator is provided with a first heat dissipation channel, which has a coolant inlet and a coolant outlet.

[0008] Furthermore, the IGCT converter valve assembly also includes a first connecting pipe, through which the coolant outlet of one of the two adjacent second heat sinks is connected to the coolant inlet of the other second heat sink.

[0009] Furthermore, the IGCT converter valve assembly also includes a second connecting pipe, and a second heat dissipation channel is provided inside the first heat sink. The second heat dissipation channels of multiple first heat sinks are connected through the second connecting pipe, and the second connecting pipe is arranged in parallel with the first connecting pipe.

[0010] Furthermore, the second heat dissipation component is a heat-conducting block, which has a first plane and a second plane arranged opposite to each other, and the first plane and the second plane are respectively fitted to two adjacent lightning protection devices.

[0011] Furthermore, the press-fit assembly includes a first upright plate, a second upright plate, and a screw. The first upright plate and the second upright plate are fixedly installed. Multiple lightning protection devices and multiple second heat sinks are located between the first upright plate and the second upright plate. The first upright plate is provided with a threaded hole. The screw is threadedly engaged with the threaded hole and abuts against the second heat sink near the first upright plate.

[0012] Furthermore, a positioning structure is provided between the lightning protection device and its adjacent second heat sink. The positioning structure includes a positioning groove and a positioning protrusion that positions and cooperates with the positioning groove. The positioning groove is provided on one of the lightning protection device and the second heat sink, and the positioning protrusion is provided on the other of the lightning protection device and the second heat sink.

[0013] Furthermore, the lightning protection device includes a surge arrester, conductive end caps, and an insulating cylinder. There are two conductive end caps, which are located on opposite sides of the surge arrester. The conductive end caps are fitted together with the second heat sink, and the insulating cylinder surrounds the outer periphery of the surge arrester.

[0014] Furthermore, the positioning structure is positioned between the conductive end cap and its adjacent second heat sink.

[0015] Furthermore, the lightning protection device also includes an insulating skirt, which is arranged around the outer perimeter of the insulating cylinder.

[0016] Furthermore, the insulating skirt is made of rubber material, and the insulating cylinder is provided with pressure relief grooves, with the insulating skirt covering the outside of the pressure relief grooves.

[0017] Furthermore, a positioning structure is provided between the lightning protection device and its adjacent second heat sink. The positioning structure includes a first positioning groove, a second positioning groove, and a positioning pin. The first positioning groove is provided on the lightning protection device, the second positioning groove is provided on the second heat sink, and the positioning pin is provided in the first positioning groove and the second positioning groove.

[0018] Furthermore, each lightning protection device includes a surge arrester, multiple first heat sinks and multiple second heat sinks are arranged in a one-to-one correspondence, and multiple conductive bars are connected in a one-to-one correspondence between the multiple first heat sinks and multiple second heat sinks.

[0019] Furthermore, there are m lightning protection devices, each of which includes n surge arresters. The n surge arresters are fitted together and electrically connected. There are m+1 second heat sinks.

[0020] Furthermore, integrated gate-commutated thyristors are One, the first heat sink is There are m+1 conductive busbars, and each of the m+1 conductive busbars corresponds to one of the m+1 second heat sinks. The second heat sinks and the first heat sinks corresponding to the second heat sinks are electrically connected through a conductive busbar. Both m and n are positive integers.

[0021] Furthermore, the first direction is set perpendicular to the second direction.

[0022] According to the technical solution of this invention, the IGCT converter valve assembly includes: multiple integrated gate commutator thyristors, multiple first heat sinks, multiple surge protectors, multiple second heat sinks, a press-fit assembly, and multiple conductive busbars. The multiple integrated gate commutator thyristors are spaced apart along a first direction. The multiple first heat sinks are spaced apart, with an integrated gate commutator thyristor bonded between adjacent first heat sinks, and the first heat sinks are electrically connected to the integrated gate commutator thyristors. The multiple surge protectors are spaced apart from the multiple integrated gate commutator thyristors along a second direction, which forms an angle with the first direction. The multiple second heat sinks are spaced apart, with a surge protector bonded between adjacent second heat sinks, and the second heat sinks are electrically connected to the surge protectors. The press-fit assembly is used to press together the multiple surge protectors and the multiple second heat sinks. The conductive busbars electrically connect the first heat sinks to the second heat sinks. Thus, the IGCT converter valve assembly achieves effective thermal management of the multiple integrated gate commutator thyristors through the arrangement of multiple integrated gate commutator thyristors and multiple first heat sinks. Furthermore, the arrangement of multiple integrated gate commutator thyristors and multiple first heat sinks increases the contact area between the integrated gate commutator thyristors and adjacent first heat sinks, improving thermal conductivity and ensuring that the integrated gate commutator thyristors can quickly dissipate heat under high load, maintaining a safe temperature range. The installation of multiple second heat sinks and multiple surge protectors achieves effective thermal management of the surge protector. Moreover, the arrangement of multiple second heat sinks and multiple surge protectors increases the contact area between the second heat sinks and adjacent surge protectors, improving thermal conductivity and ensuring that the surge protector can quickly dissipate heat. With the rapid dissipation of heat from the surge protector, energy accumulation within the surge protector is reduced, thereby mitigating the performance degradation or damage caused by energy overload, which leads to poor continuous active shut-off capability of the IGCT converter valve. Furthermore, the press-fit assembly further enhances the heat transfer efficiency between multiple surge arresters and secondary heat sinks, thereby improving the heat dissipation efficiency of the surge arresters and reducing energy accumulation within them. This mitigates the problem of performance degradation or damage due to energy overload, which can lead to poor continuous active shut-off capability of the IGCT converter valve. The press-fit assembly also allows for a more compact structure of the multiple surge arresters and secondary heat sinks, increasing the integration of the IGCT converter valve assembly. Therefore, the technical solution of this application effectively solves the problem of poor continuous active shut-off capability of the IGCT converter valve caused by surge arresters in related technologies.

[0023] Furthermore, the conductive connection between the first heat sink and the integrated gate commutator thyristor, the conductive connection between the second heat sink and the surge arrester, and the conductive connection between the first and second heat sinks via a busbar enable the integrated gate commutator thyristor to be conductively connected to the surge arrester. This allows the surge arrester to absorb voltage energy and perform transient overvoltage protection. The electrical connection established between the first and second heat sinks via the busbar not only reduces the resistance between them, improves current transmission efficiency, and reduces energy loss at the electrical connection point, but also further enhances the thermal management capability of the entire IGCT converter valve assembly through the high thermal conductivity of the busbar. The presence of the busbar is equivalent to building an efficient and reliable heat and electrical energy transmission channel in the IGCT converter valve assembly, enabling the first and second heat sinks to work together, optimizing heat distribution and dissipation, ensuring that the assembly can maintain a stable operating state under high temperature, high pressure and high current environments, extending the service life of the device, reducing maintenance costs, and enabling the IGCT converter valve assembly to operate stably under complex and harsh conditions, resisting the impact of commutation failure and other electrical faults, providing strong support for the safe and efficient operation of the high voltage DC transmission system. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1 A schematic diagram of an embodiment of the IGCT converter valve assembly according to the present invention is shown, wherein each lightning protection device includes a surge arrester.

[0026] Figure 2 It shows Figure 1 A schematic diagram of the structure of each surge arrester in the IGCT converter valve assembly, which includes n surge arresters;

[0027] Figure 3 It shows Figure 1 A perspective view of the IGCT converter valve assembly including the first connecting pipe.

[0028] Figure 4 It shows Figure 1 A three-dimensional structural diagram of the IGCT converter valve assembly when the second heat sink is a heat-conducting block;

[0029] Figure 5 It shows Figure 1 A perspective schematic diagram of an embodiment of the lightning protection device for an IGCT converter valve assembly;

[0030] Figure 6 It shows Figure 1A perspective view of another embodiment of the lightning protection device for the IGCT converter valve assembly;

[0031] Figure 7 It shows Figure 1 A perspective schematic diagram of another embodiment of the lightning protection device for the IGCT converter valve assembly;

[0032] Figure 8 It shows Figure 1 A perspective schematic diagram of another embodiment of the lightning protection device for the IGCT converter valve assembly;

[0033] Figure 9 It shows Figure 1 A schematic diagram of the lightning protection device and the second heat sink of the IGCT converter valve assembly.

[0034] The above figures include the following reference numerals:

[0035] 10. Integrated gate-commutated thyristors;

[0036] 20. First heat sink component;

[0037] 30. Lightning protection device; 31. Lightning arrester; 32. Conductive end cap; 321. Positioning groove; 33. Insulating cylinder; 331. Pressure relief groove; 34. Insulating skirt; 35. First positioning groove;

[0038] 40. Second heat sink; 41. Coolant inlet; 42. Coolant outlet; 43. Second positioning groove; 44. Positioning pin;

[0039] 50. Conductive busbar;

[0040] 60. First connecting tube. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0043] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0044] like Figure 1 and Figure 2As shown, applying the technical solution of this embodiment, the IGCT converter valve assembly includes: multiple integrated gate commutator thyristors 10, multiple first heat sinks 20, multiple surge protectors 30, multiple second heat sinks 40, a press-fit assembly, and multiple conductive busbars 50. The multiple integrated gate commutator thyristors 10 are spaced apart along a first direction. The multiple first heat sinks 20 are spaced apart, with an integrated gate commutator 10 bonded between adjacent first heat sinks 20, and the first heat sinks 20 and integrated gate commutator thyristors 10 are electrically connected. The multiple surge protectors 30 and the multiple integrated gate commutator thyristors 10 are spaced apart along a second direction, which forms an angle with the first direction. The multiple second heat sinks 40 are spaced apart, with a surge protector 30 bonded between adjacent second heat sinks 40, and the second heat sinks 40 and surge protectors 30 are electrically connected. The press-fit assembly is used to press together the multiple surge protectors 30 and the multiple second heat sinks 40. The conductive busbar 50 electrically connects the first heat sink 20 and the second heat sink 40. In this way, the IGCT converter valve assembly achieves effective thermal management of the multiple integrated gate commutator thyristors 10 through the arrangement of multiple first heat sinks 20. Furthermore, the arrangement of the multiple integrated gate commutator thyristors 10 and the multiple first heat sinks 20 increases the contact area between the integrated gate commutator thyristors 10 and adjacent first heat sinks 20, improving thermal conductivity and ensuring that the integrated gate commutator thyristors 10 can quickly dissipate heat and remain within a safe temperature range during high-load operation. Similarly, the arrangement of multiple second heat sinks 40 and multiple surge protectors 30 achieves effective thermal management of the surge protectors 30. Furthermore, the arrangement of the multiple second heat sinks 40 and the multiple surge protectors 30 increases the contact area between the second heat sinks 40 and adjacent surge protectors 30, improving thermal conductivity and ensuring that the surge protectors 30 can quickly dissipate heat. As the heat from the surge arrester 30 is rapidly dissipated, the energy accumulation within the surge arrester 30 is reduced, thereby mitigating the performance degradation or damage caused by energy overload, which results in poor continuous active shut-off capability of the IGCT converter valve. Furthermore, the press-fit assembly further enhances the heat transfer efficiency between the multiple surge arresters 30 and the multiple second heat sinks 40, further accelerating the heat dissipation efficiency of the surge arresters 30 and reducing energy accumulation within them. This further reduces the performance degradation or damage caused by energy overload, which results in poor continuous active shut-off capability of the IGCT converter valve. The press-fit assembly also makes the structure of the multiple surge arresters 30 and the multiple second heat sinks 40 more compact, improving the integration of the IGCT converter valve assembly. Therefore, the technical solution of this embodiment effectively solves the problem of poor continuous active shut-off capability of the IGCT converter valve caused by surge arresters in related technologies.

[0045] Furthermore, the conductive connection between the first heat sink 20 and the integrated gate commutator thyristor 10, the conductive connection between the second heat sink 40 and the surge protector 30, and the conductive bus 50 connecting the first heat sink 20 and the second heat sink 40 enable the integrated gate commutator thyristor 10 to be conductively connected to the surge protector 30, allowing the surge protector 30 to absorb voltage energy and perform the task of transient overvoltage protection. The electrical connection established between the first heat sink 20 and the second heat sink 40 by the conductive bus 50 not only reduces the resistance between them, improves current transmission efficiency, and reduces energy loss at the electrical connection, but also further enhances the thermal management capability of the entire IGCT converter valve assembly through the high thermal conductivity of the conductive bus 50. The presence of the busbar 50 is equivalent to constructing an efficient and reliable heat and electrical energy transmission channel in the IGCT converter valve assembly, enabling the first heat sink 20 and the second heat sink 40 to work together, optimizing heat distribution and dissipation, ensuring that the IGCT converter valve assembly can maintain a stable operating state under high temperature, high pressure and high current environments, extending the service life of the device, reducing maintenance costs, and enabling the IGCT converter valve assembly to operate continuously and stably under complex and harsh operating conditions, resisting the impact of commutation failure and other electrical faults, and providing strong support for the safe and efficient operation of the high voltage DC transmission system.

[0046] Furthermore, the inventors discovered that the insulation distance between terminals of existing surge arresters is affected by bolts, easily leading to problems such as partial discharge or even breakdown due to insufficient air gap, seriously endangering the normal operation of the converter valve. The above embodiment, through the setting of the press-fit assembly, can reduce the volume of the surge arrester 30 and replace the connection with the integrated gate commutator thyristor 10 with a conductive busbar 50, forming a larger air gap and avoiding the tip discharge caused by bolts in related technologies. The press-fit assembly facilitates the pressing and fixing of multiple surge arresters 30 and multiple second heat sinks 40, replacing the fixing of the surge arresters 30 and second heat sinks 40 with bolts in related technologies, making the assembly of the IGCT converter valve assembly simpler, and reducing the internal space occupied by the IGCT converter valve assembly by eliminating bolts, resulting in a more compact structure. The press-fit assembly, by pressing multiple surge arresters 30 and multiple second heat sinks 40 together, ensures that the surge arrester 30 can dissipate heat at all times, promptly dissipating energy through the end face of the surge arrester 30 and maintaining its thermal stability.

[0047] like Figure 3As shown, the second heat sink 40 is a radiator, and a first heat dissipation channel is provided inside the radiator. The first heat dissipation channel has a coolant inlet 41 and a coolant outlet 42. Designing the second heat sink 40 as a radiator with a first heat dissipation channel can increase the contact area between the second heat sink 40 and the coolant, improve the heat dissipation efficiency of the second heat sink 40, and enable the surge arrester 30 to transfer and dissipate heat in a timely manner when absorbing overvoltage energy and converting it into heat energy. This removes the heat inside the surge arrester 30, prevents the performance degradation or damage of the surge arrester 30 caused by heat accumulation, thereby extending the service life of the surge arrester 30 and enhancing the continuous operation capability and the ability to resist commutation failure of the IGCT converter valve assembly.

[0048] like Figure 3 As shown, the IGCT converter valve assembly also includes a first connecting pipe 60. The coolant outlet 42 of one of the two adjacent second heat sinks 40 is connected to the coolant inlet 41 of the other second heat sink 40 via the first connecting pipe 60. The design of the first connecting pipe 60 connects multiple second heat sinks 40, forming a coolant circulation system, ensuring that the coolant can flow evenly among the multiple surge arresters 30, thereby achieving thermal balance of the entire IGCT converter valve assembly.

[0049] Furthermore, the IGCT converter valve assembly also includes a second connecting pipe. A second heat dissipation channel is provided within the first heat sink 20, and the second heat dissipation channels of multiple first heat sinks 20 are connected through the second connecting pipe. The second connecting pipe is arranged in parallel with the first connecting pipe 60. The cooling system formed by the parallel connection of the second connecting pipe and the first connecting pipe 60 provides a direct coolant circulation path for the first heat sink 20 and the second heat sink 40, protecting critical components from overheating damage and enhancing the stability and reliability of the system. Moreover, the parallel connection of the second connecting pipe and the first connecting pipe 60 allows the coolant flow of the multiple first heat sinks 20 and the multiple second heat sinks 40 to be independent, thereby improving the heat dissipation efficiency for the integrated gate commutated thyristor 10 and the surge arrester 30.

[0050] In some embodiments, the liquid medium flowing through the first heat dissipation channel, the second connecting pipe, and the first connecting pipe 60 is preferably coolant. The second connecting pipe and the first connecting pipe 60 are not interconnected. The second connecting pipe and the first connecting pipe 60 can be connected in parallel to a coolant supply device, and coolant can be introduced into the second connecting pipe and the first connecting pipe 60 respectively to form a water-cooling system.

[0051] like Figure 4As shown, in other embodiments, the second heat sink 40 is a heat-conducting block, which has a first plane and a second plane disposed opposite to each other, and the first plane and the second plane are respectively fitted into two adjacent lightning protection devices 30. Designing the second heat sink 40 as a heat-conducting block, with a first plane and a second plane tightly fitted into the lightning protection device 30, not only simplifies the structure of the heat dissipation system and reduces the complexity of assembly and maintenance, but also, due to the high thermal conductivity of the heat-conducting block, enables faster and more uniform diffusion of the heat generated by the lightning protection device 30, accelerating the heat transfer process and improving the thermal stability and continuous working capability of the lightning protection device 30. In other embodiments, the heat-conducting block is a solid block, preferably a metal block.

[0052] Furthermore, the press-fit assembly includes a first upright plate, a second upright plate, and a screw. The first and second upright plates are fixedly mounted, and multiple surge protectors 30 and multiple second heat sinks 40 are located between the first and second upright plates. The first upright plate has threaded holes, and the screw is threaded into these holes, abutting against the second heat sinks 40 located near the first upright plate. In this way, the engagement of the screw with the threaded holes on the first upright plate allows the screw to abut against the multiple surge protectors 30 and the multiple second heat sinks 40 between the end face of the screw and the second upright plate, ensuring a tight fit between the surge protectors 30 and the second heat sinks 40, reducing gaps between them, and improving heat transfer efficiency. This press-fitting method also improves the mechanical strength and installation stability of the surge protectors 30 and the second heat sinks 40 during fixation, reduces vibration and noise during operation, and provides a more stable operating environment for the IGCT converter valve assembly.

[0053] In some embodiments, the IGCT converter valve assembly further includes an insulating plate disposed between the second heat sink 40 near the first vertical plate and the screw. The area of ​​the insulating plate is larger than the cross-sectional area of ​​the screw. The insulating plate effectively isolates the direct contact between the screw and the second heat sink 40, reducing the possibility of deformation of the second heat sink 40 when the screw abuts against it. This results in a more uniform stress distribution on the second heat sink 40, making the crimping between the second heat sink 40 and the surge protector 30 more reliable. Because the area of ​​the insulating plate is larger than the cross-sectional area of ​​the screw, this design expands the distribution area of ​​the clamping force, making the pressure on the second heat sink 40 more uniform and avoiding structural deformation or damage caused by localized overpressure. This not only improves the contact quality between the second heat sink 40 and the surge protector 30 and increases heat dissipation efficiency, but also ensures the electrical connection stability and thermal management consistency between the surge protector 30 and the second heat sink 40, further enhancing the continuous operation capability and fault resistance of the IGCT converter valve assembly.

[0054] In other embodiments, when the press-fit assembly is connected to an external mounting base, such as a mounting bracket or mounting seat, the first upright plate and the second upright plate are connected to the mounting base to achieve a fixed setting of the first upright plate and the second upright plate.

[0055] like Figure 6 and Figure 8 As shown, a positioning structure is provided between the lightning protection device 30 and its adjacent second heat sink 40. The positioning structure includes a positioning groove 321 and a positioning protrusion that positions and cooperates with the positioning groove 321. The positioning groove 321 is located on the lightning protection device 30, and the positioning protrusion is located on the second heat sink 40. The positioning structure design of the positioning groove 321 and the positioning protrusion precisely controls the relative position between the lightning protection device 30 and the second heat sink 40, avoiding misalignment or loosening during assembly or pressing, and ensuring the stability of the electrical connection and the reliability of heat conduction. At the same time, the positioning structure design helps to improve the degree of production automation, increase assembly accuracy, and reduce manufacturing costs.

[0056] In other embodiments, the positioning groove 321 is provided on the second heat sink 40, and the positioning protrusion is provided on the lightning protection device 30.

[0057] like Figures 5 to 8 As shown, the surge arrester 30 includes a surge arrester 31, conductive end caps 32, and an insulating cylinder 33. Two conductive end caps 32 are positioned on opposite sides of the surge arrester 31, and are fitted into the second heat sink 40. The insulating cylinder 33 surrounds the outer periphery of the surge arrester 31. The surge arrester 30, composed of the surge arrester 31, conductive end caps 32, and insulating cylinder 33, improves the electrical insulation level of the surge arrester 31. The use of conductive end caps 32 increases the contact area between the surge arrester 31 and the second heat sink 40, promoting rapid heat transfer. The insulating cylinder 33 ensures that the surge arrester 31 has sufficient insulation performance under high-voltage conditions, preventing electrical faults and improving the overall safety and reliability of the IGCT converter valve assembly.

[0058] In other embodiments, the surge arrester 30 includes two surge arresters 31 fitted together, two conductive end caps 32 fitted together on the opposite outer surfaces of the two surge arresters 31, an insulating cylinder 33 surrounding the outer periphery of the two surge arresters 31, and an insulating skirt 34 surrounding the outer periphery of the insulating cylinder 33. By fitting the two surge arresters 31 together, the energy absorption capacity of the surge arrester 30 is substantially increased. Simultaneously, the two surge arresters 31 can share the energy surge, reducing the risk of overload on a single surge arrester 31. This design provides stronger protection capabilities and ensures system stability when the high-voltage direct current transmission system encounters sudden overvoltages. The conductive end caps 32 fitted together on the outer surfaces of the two surge arresters 31 ensure tight electrical connection between the surge arresters 31 and the external environment, improving energy conversion and heat transfer efficiency, and enhancing the electrical performance and thermal management capabilities of the surge arrester 30. The insulating cylinder 33 is placed around the outer periphery of the two surge arresters 31, and the insulating skirt 34 is placed around the outer periphery of the insulating cylinder 33. This can fix the two surge arresters 31 and achieve insulation of the surge arresters 31, thereby reducing processing costs and processing steps.

[0059] In some embodiments, to ensure that the surge arrester 31 has sufficient heat dissipation surface, can withstand sufficient crimping force, and has a sufficient level of external insulation, the surge arrester 31 and the conductive end cap 32 should ensure that the end faces are sufficiently level and that positioning structures are configured as needed.

[0060] Furthermore, a positioning structure is disposed between the conductive end cap 32 and its adjacent second heat sink 40. This allows for more accurate positioning of the conductive end cap 32 and the second heat sink 40, and improves the fit between the end cap and the second heat sink 40 through the press-fit assembly, thereby enhancing the heat conduction efficiency and conductivity between the end cap and the second heat sink 40. Moreover, the above-described structure is simple and facilitates the fabrication of the lightning protection device 30.

[0061] like Figures 5 to 8 As shown, the surge arrester 30 also includes an insulating shed 34, which surrounds the outer periphery of the insulating cylinder 33. The insulating shed 34 not only improves the insulation performance of the surge arrester 30 and prevents electrical short circuits in high-voltage environments, but also further ensures that the surge arrester 31 has sufficient insulation performance in high-voltage environments, preventing electrical faults and improving the overall safety and reliability of the IGCT converter valve assembly.

[0062] like Figure 7 and Figure 8As shown, the insulating skirt 34 is made of rubber material, and the insulating cylinder 33 is provided with a pressure relief groove 331. The insulating skirt 34 covers the outside of the pressure relief groove 331. This arrangement allows for the pre-setting of the rupture location of the insulating cylinder 33 through the pressure relief groove 331. When an overvoltage occurs, causing the surge arrester 31 to release pressure and resulting in the breakage of the insulating cylinder 33, the insulating skirt 34, being made of rubber, is elastic. The insulating skirt 34 surrounding the outer periphery of the insulating cylinder 33 can also wrap around the debris generated when the surge arrester 31 or the insulating cylinder 33 breaks, preventing the free-flying of fragments and reducing the impact on other structures. The pressure relief groove 331 ensures uneven stress distribution when the surge arrester 31 experiences overvoltage, making the pressure relief groove 331 prone to rupture. The insulating skirt 34, by covering the pressure relief groove 331, reduces the free-flying of fragments from the surge arrester 31 or the insulating cylinder 33. Furthermore, since the insulating skirt 34 is made of rubber, it is elastic, which reduces the possibility of the insulating skirt 34 breaking due to the influence of the surge arrester 31 or the insulating cylinder 33. Moreover, the insulating skirt 34 made of rubber can more effectively wrap and cover the surge arrester 31 and the insulating cylinder 33, ensuring the insulation performance of the surge arrester 31 and the insulating cylinder 33 before and after the breakage, thus enhancing the safety and reliability of the surge protection device 30.

[0063] Preferably, such as Figure 7 and Figure 8 As shown, the insulating cylinder 33 has an inner wall and an outer wall. The inner wall of the insulating cylinder 33 contacts the surge arrester 31, and the insulating skirt 34 is fitted over the outer wall of the insulating cylinder 33 and is made of rubber. A pressure relief groove 331 is provided on the inner wall of the insulating cylinder 33, with its opening facing the surge arrester 31. Thus, when an overvoltage condition causes the surge arrester 31 to break, the pressure released when the surge arrester 31 breaks is more likely to affect the pressure relief groove 331 because it is located on the inner wall of the insulating cylinder 33 and its opening faces the surge arrester 31. This makes the pressure relief groove 331 of the insulating cylinder 33 more likely to withstand greater force, thereby making the breakage of the insulating cylinder 33 more controllable and reducing the impact on other areas. Furthermore, since the rubber insulating skirt 34 is fitted outside the outer wall of the insulating cylinder 33, the rubber insulating skirt 34 can wrap the debris generated when the surge arrester 31 breaks, preventing the free splashing of fragments of the surge arrester 31 or the insulating cylinder 33, and reducing the impact on other structures.

[0064] In some embodiments, an insulating skirt 34 is provided according to the insulation requirements of the surge arrester 30. The material can be ceramic to facilitate heat dissipation. When pressure release is required, the insulating skirt 34 is made of rubber, which has a certain degree of elasticity to prevent fragments of the surge arrester 31 from flying and reduce the impact on other structures.

[0065] like Figure 9 As shown, a positioning structure is provided between the lightning protection device 30 and its adjacent second heat sink 40. The positioning structure includes a first positioning groove 35, a second positioning groove 43, and a positioning pin 44. The first positioning groove 35 is disposed on the lightning protection device 30, the second positioning groove 43 is disposed on the second heat sink 40, and the positioning pin 44 is disposed within the first positioning groove 35 and the second positioning groove 43. The positioning structure design of the first positioning groove 35, the second positioning groove 43, and the positioning pin 44 precisely controls the relative position between the lightning protection device 30 and the second heat sink 40, avoiding misalignment or loosening during assembly or pressing, and ensuring the stability of the electrical connection and the reliability of heat conduction. Simultaneously, the positioning structure design helps to improve the degree of production automation, increase assembly accuracy, and reduce manufacturing costs.

[0066] like Figure 5 As shown, the surge arrester 30 includes a surge arrester 31, two conductive end caps 32, an insulating cylinder 33, and an insulating skirt 34. The two conductive end caps 32 are disposed on opposite sides of the surge arrester 31, and are fitted into the second heat sink 40. The insulating cylinder 33 surrounds the outer periphery of the surge arrester 31. The insulating skirt 34 is made of ceramic material.

[0067] like Figure 6 As shown, the surge arrester 30 includes a surge arrester 31, two conductive end caps 32, an insulating cylinder 33, and an insulating skirt 34. The two conductive end caps 32 are disposed on opposite sides of the surge arrester 31, and are fitted into the second heat sink 40. The insulating cylinder 33 surrounds the outer periphery of the surge arrester 31. The insulating skirt 34 is made of ceramic material. Each of the two conductive end caps 32 has a positioning groove 321, the opening of which penetrates the surface of the conductive end cap 32 away from the surge arrester 31.

[0068] like Figure 7As shown, the surge arrester 30 includes a surge arrester 31, two conductive end caps 32, an insulating cylinder 33, and an insulating shed 34. The two conductive end caps 32 are disposed on opposite sides of the surge arrester 31, and are fitted into the second heat sink 40. The insulating cylinder 33 surrounds the outer periphery of the surge arrester 31. The insulating shed 34 is made of rubber. A pressure relief groove 331 is provided on the insulating cylinder 33. The insulating cylinder 33 has an inner wall and an outer wall. The inner wall of the insulating cylinder 33 contacts the surge arrester 31, and the insulating shed 34 is fitted over the outer wall of the insulating cylinder 33. The pressure relief groove 331 is located on the inner wall of the insulating cylinder 33, and its opening faces the surge arrester 31. Thus, when an overvoltage condition causes the surge arrester 31 to break, the pressure relief groove 331, located on the inner wall of the insulating cylinder 33 with its opening facing the surge arrester 31, allows the pressure released when the surge arrester 31 breaks to more easily affect the pressure relief groove 331. This makes the pressure relief groove 331 of the insulating cylinder 33 more likely to withstand greater force, making the breakage of the insulating cylinder 33 more controllable and reducing the impact on other areas. Furthermore, because the rubber insulating skirt 34 is fitted over the outer wall of the insulating cylinder 33, it can wrap the debris generated when the surge arrester 31 breaks, preventing the free-flying of fragments from the surge arrester 31 or the insulating cylinder 33 and reducing the impact on other structures.

[0069] like Figure 8As shown, the surge arrester 30 includes a surge arrester 31, two conductive end caps 32, an insulating cylinder 33, and an insulating skirt 34. The two conductive end caps 32 are located on opposite sides of the surge arrester 31 and are fitted into the second heat sink 40. The insulating cylinder 33 surrounds the outer periphery of the surge arrester 31. The insulating skirt 34 is made of rubber. A pressure relief groove 331 is provided on the insulating cylinder 33. The insulating cylinder 33 has an inner wall and an outer wall. The inner wall of the insulating cylinder 33 contacts the surge arrester 31, and the insulating skirt 34 is fitted over the outer wall of the insulating cylinder 33. The pressure relief groove 331 is located on the inner wall of the insulating cylinder 33, and its opening faces the surge arrester 31. Thus, when an overvoltage condition causes the surge arrester 31 to break, the pressure relief groove 331, located on the inner wall of the insulating cylinder 33 with its opening facing the surge arrester 31, allows the pressure released during the breakage of the surge arrester 31 to more easily affect the pressure relief groove 331. This makes the pressure relief groove 331 of the insulating cylinder 33 more susceptible to bearing greater force, making the breakage of the insulating cylinder 33 more controllable and reducing the impact on other areas. Furthermore, the rubber insulating skirt 34, fitted over the outer wall of the insulating cylinder 33, can effectively encapsulate the debris generated when the surge arrester 31 breaks, preventing the free-flying of fragments from the surge arrester 31 or the insulating cylinder 33 and reducing the impact on other structures. Both conductive end caps 32 are provided with positioning grooves 321, the openings of which penetrate the conductive end caps 32 away from the surface of the surge arrester 31.

[0070] like Figure 1 As shown, each surge arrester 30 includes a surge arrester 31, multiple first heat sinks 20 and multiple second heat sinks 40 are arranged in a one-to-one correspondence, and multiple conductive busbars 50 are connected one-to-one between the multiple first heat sinks 20 and multiple second heat sinks 40. This arrangement ensures the heat dissipation efficiency of each surge arrester 31, ensuring that the heat generated by the surge arrester 31 can be quickly absorbed by the second heat sinks 40, allowing the heat from each heat sink to dissipate rapidly. The conductive busbars 50 not only provide reliable electrical connections but also act as a medium for heat transfer, making the heat transfer between the first heat sinks 20 and the second heat sinks 40 smoother and improving the thermal management efficiency of the entire IGCT converter valve assembly. This precise one-to-one correspondence, combined with the highly conductive and thermally conductive busbars 50, constructs a highly efficient and integrated thermal management and electrical connection system, optimizing the heat dissipation performance of the IGCT converter valve assembly, extending its service life, and improving the continuous operation capability and fault adaptability of the IGCT converter valve assembly, providing a safer, more stable, and more efficient operational guarantee for the high-voltage direct current transmission system.

[0071] Preferably, such as Figure 1As shown, there are six second heat sinks 40, five lightning protection devices 30, and each lightning protection device 30 includes a surge arrester 31. There are six conductive busbars 50, five integrated gate commutated thyristors 10, and six first heat sinks 20. The six first heat sinks 20 and six second heat sinks 40 are arranged in a one-to-one correspondence, and the six conductive busbars 50 are connected one-to-one between the six first heat sinks 20 and the six second heat sinks 40.

[0072] like Figure 2 As shown, there are m surge protection devices 30, each including n surge arresters 31. The n surge arresters 31 are fitted together and electrically connected. There are m+1 second heat sinks 40. When each surge protection device 30 contains n surge arresters 31, it can significantly improve the overvoltage protection capability of the IGCT converter valve assembly, especially under high-frequency commutation failure conditions. It can disperse the transient energy borne by a single surge arrester 31, avoid local overload, and enhance the continuous working capability of the surge protection device 30. At the same time, the two second heat sinks 40 can be set on both sides of the n surge arresters 31 and dissipate heat from the n surge arresters 31, optimizing the heat dissipation performance of the IGCT converter valve assembly, extending its service life, improving the continuous operation capability and fault adaptability of the IGCT converter valve assembly, and providing a safer, more stable, and more efficient operation guarantee for the high-voltage direct current transmission system.

[0073] like Figure 2 As shown, the integrated gate commutated thyristor 10 is One, the first heat sink 20 is There are m+1 conductive busbars 50, and each m+1 conductive busbar 50 corresponds one-to-one with one m+1 second heat sinks 40. The second heat sinks 40 and their corresponding first heat sinks 20 are electrically connected via a conductive busbar 50. Through the aforementioned integration of the gate commutator thyristor 10, the first heat sink 20, the second heat sink 40, and the conductive busbars 50, as well as the matching arrangement of the conductive busbars 50, the continuous turn-off capability of the IGCT converter valve assembly can be effectively improved. This arrangement allows users to determine the quantity of each component of the IGCT converter valve assembly according to actual usage requirements, increasing the applicability of the IGCT converter valve assembly and ensuring that the IGCT converter valve assembly maintains a stable and controllable state during continuous active turn-off, preventing performance degradation or malfunction due to heat dissipation issues. This significantly enhances the IGCT converter valve assembly's ability to withstand commutation failures and improves the overall stability of the high-voltage direct current transmission system.

[0074] In the above embodiment, m+1 conductive busbars 50 are connected to m+1 second heat sinks 40 in a one-to-one correspondence, and the m+1 conductive busbars 50 and Each of the first heat sinks 20 is connected accordingly. That is, two adjacent conductive bars 50 are connected to each of the (n+1) first heat sinks 20. The first conductive bar 50 is connected between the first second heat sink 40 and the first first heat sink 20; the second conductive bar 50 is connected between the second second heat sink 40 and the (n+1)th first heat sink 20; the third conductive bar 50 is connected between the third second heat sink 40 and the (2n+1)th first heat sink 20; the fourth conductive bar 50 is connected between the fourth second heat sink 40 and the (3n+1)th first heat sink 20; and the m-th conductive bar 50 is connected between the m-th second heat sink 40 and the (n+1)th first heat sink 20. Between the first heat sink 20, the (m+1)th conductive bus 50 is connected to the (m+1)th second heat sink 40 and the first... Between the first heat sink component 20.

[0075] like Figure 2 As shown, preferably, there are four second heat sinks 40, three lightning protection devices 30, and each lightning protection device 30 includes two surge arresters 31. There are four conductive busbars 50, six integrated gate commutator thyristors 10, and seven first heat sinks 20. The four conductive busbars 50 are arranged in a one-to-one correspondence with the four second heat sinks 40. Two adjacent conductive busbars 50 are connected to three corresponding first heat sinks 20. The first conductive busbar 50 is connected between the first second heat sink 40 and the first first heat sink 20, the second conductive busbar 50 is connected between the second second heat sink 40 and the third first heat sink 20, the third conductive busbar 50 is connected between the third second heat sink 40 and the fifth first heat sink 20, and the fourth conductive busbar 50 is connected between the fourth second heat sink 40 and the seventh first heat sink 20.

[0076] Furthermore, the first direction is perpendicular to the second direction. This perpendicular arrangement allows the IGCT converter valve assembly and surge arrester to be arranged in the most compact manner, reducing the internal space occupied by the IGCT converter valve assembly and improving the module's integration. This layout also maintains convenient electrical connections and superior insulation performance, providing a more reliable and efficient design solution for high-voltage direct current transmission systems.

[0077] In this embodiment, the first direction and the second direction are located in the same horizontal plane and are perpendicular to each other.

[0078] High-voltage direct current (HVDC) transmission is a core technology for achieving long-distance, high-capacity power transmission, and commutation failure is one of its key challenges. Commutation failure refers to the failure of the valve arm to close properly during thyristor commutation due to voltage drops, trigger delays, or insufficient current, resulting in intermittent DC current or a system short circuit. In ultra-high-voltage systems, the high-voltage, high-current operating environment exacerbates the risk of commutation failure, especially when there is a fault in the receiving-end AC system, a sudden voltage drop may trigger continuous commutation failures, threatening grid stability.

[0079] The inventors discovered that most controllable commutation valves in related technologies are based on controllable turn-off devices, and fault ride-through mainly relies on components such as surge arresters and capacitors to provide auxiliary commutation voltage. Among these, component-level MOVs (surge arresters) are widely used as component-level devices within controllable commutation valves, playing a role in suppressing turn-off voltage and absorbing commutation energy. However, due to the difficulty in simultaneously satisfying the characteristics of low protection level, low voltage ratio, and high energy of component-level MOVs, current controllable commutation valve component-level MOV designs prioritize maintaining protection level, resulting in an energy limit that cannot support multiple consecutive active turn-offs. Furthermore, current surge arresters have extremely slow heat dissipation (over 6 hours), making it difficult to withstand multiple turn-off impacts in a short period. The size of the surge arrester is also a major issue affecting the engineering application of the commutation valve. In conclusion, there is still room for improvement and enhancement in current controllable commutation valves and surge arresters.

[0080] By applying the technical solution of the above embodiments, the heat transfer efficiency between multiple surge arresters and multiple second heat sinks can be further improved through the setting of the second heat sink and the press-fit assembly, thereby further improving the heat dissipation efficiency of the surge arresters and reducing the energy accumulation within the surge arresters. This solves the problem of limited turn-off times and slow energy absorption and heat dissipation in the surge arresters of IGCT converter valve assemblies due to the upper limit of energy. This is of great significance for improving the ability of IGCT converter valve assemblies to continuously and actively turn off to resist commutation failure, continuously and actively turn off with small current to reduce reactive power demand, and even have the ability to send reactive power. Furthermore, the technical solution of the above embodiments can improve the continuous energy absorption and circulating heat dissipation capabilities of the surge arresters; it can also fix multiple surge arresters and multiple second heat sinks through the press-fit assembly, reducing the setting of other additional fixing structures or connection structures, thereby reducing the space occupied by the surge arresters and making the structure of the IGCT converter valve assembly more compact. The technical solution of the above embodiment improves the limitations of the IGCT converter valve assembly in terms of limited reliability and the number of consecutive turn-offs limited by the surge arrester. It can take into account the requirements of series voltage equalization of semiconductor devices (integrated gate commutator thyristors), continuous resistance to commutation failure, and continuous active turn-off. It innovatively proposes a structural solution based on a press-fit surge arrester, which improves the insulation reliability and continuous fault ride-through capability of the IGCT converter valve assembly.

[0081] In some embodiments, an integrated gate-commutated thyristor (IGCT) includes multiple gate-commutated thyristors and multiple drivers. The gate-commutated thyristor is also known as a GCT. The drivers are used to drive the gate-commutated thyristors. The multiple gate-commutated thyristors are spaced apart along a first direction, with one gate-commutated thyristor fitted between two adjacent first heat sinks.

[0082] In some embodiments, the reference voltage and protection level of the surge arrester are selected according to actual shutdown requirements. The average shutdown loss of the surge arrester is calculated based on the system's maximum continuous shutdown level, and the water-cooling system parameters, such as flow rate and flow resistance, are designed accordingly. To ensure that the stray parameters (stray inductance, resistance, etc.) between each surge arrester and the protected integrated gate commutated thyristor are consistent, the thickness of the second heat sink is adjusted according to the actual height of the surge arrester. The surge arrester includes one or more surge arresters.

[0083] In the description of this invention, it should be understood that "a plurality of" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0084] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0085] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0086] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An IGCT converter valve assembly, characterized in that, include: Multiple integrated gate commutator thyristors (10) are arranged at intervals along a first direction; Multiple first heat sinks (20) are spaced apart, and an integrated gate commutator thyristor (10) is attached between two adjacent first heat sinks (20). The first heat sinks (20) and the integrated gate commutator thyristor (10) are electrically connected. Multiple lightning protection devices (30) are arranged at intervals along a second direction with multiple integrated gate commutator thyristors (10), and the second direction is arranged at an angle to the first direction. Multiple second heat sinks (40) are spaced apart, and a lightning protection device (30) is attached between two adjacent second heat sinks (40). The second heat sinks (40) and the lightning protection device (30) are electrically connected. A press-fit assembly for pressing together the plurality of said lightning arresters (30) and the plurality of the second heat sinks (40); Multiple conductive bars (50) electrically connect the first heat sink (20) and the second heat sink (40).

2. The IGCT converter valve assembly according to claim 1, characterized in that, The second heat sink (40) is a radiator, and a first heat dissipation channel is provided inside the radiator. The first heat dissipation channel has a coolant inlet (41) and a coolant outlet (42).

3. The IGCT converter valve assembly according to claim 2, characterized in that, The IGCT converter valve assembly also includes a first connecting pipe (60), through which the coolant outlet (42) of one of the two adjacent second heat sinks (40) is connected to the coolant inlet (41) of the other second heat sink (40).

4. The IGCT converter valve assembly according to claim 3, characterized in that, The IGCT converter valve assembly further includes a second connecting pipe. The first heat sink (20) is provided with a second heat dissipation channel. The second heat dissipation channels of multiple first heat sinks (20) are connected through the second connecting pipe. The second connecting pipe is arranged in parallel with the first connecting pipe (60).

5. The IGCT converter valve assembly according to claim 1, characterized in that, The second heat sink (40) is a heat-conducting block, which has a first plane and a second plane arranged opposite to each other. The first plane and the second plane are respectively attached to two adjacent lightning protection devices (30).

6. The IGCT converter valve assembly according to claim 1, characterized in that, The press-fit assembly includes a first upright plate, a second upright plate, and a screw. The first upright plate and the second upright plate are fixedly installed. A plurality of lightning protection devices (30) and a plurality of second heat sinks (40) are located between the first upright plate and the second upright plate. The first upright plate is provided with a threaded hole. The screw is threadedly engaged with the threaded hole. The screw abuts against the second heat sink (40) near the first upright plate.

7. The IGCT converter valve assembly according to claim 1, characterized in that, A positioning structure is provided between the lightning protection device (30) and its adjacent second heat sink (40). The positioning structure includes a positioning groove (321) and a positioning protrusion that positions and cooperates with the positioning groove (321). The positioning groove (321) is provided on one of the lightning protection device (30) and the second heat sink (40), and the positioning protrusion is provided on the other of the lightning protection device (30) and the second heat sink (40).

8. The IGCT converter valve assembly according to claim 7, characterized in that, The lightning protection device (30) includes a surge arrester (31), a conductive end cap (32), and an insulating cylinder (33). There are two conductive end caps (32), which are disposed on opposite sides of the surge arrester (31). The conductive end caps (32) are fitted to the second heat sink (40). The insulating cylinder (33) surrounds the outer periphery of the surge arrester (31).

9. The IGCT converter valve assembly according to claim 8, characterized in that, The positioning structure is disposed between the conductive end cap (32) and the adjacent second heat sink (40).

10. The IGCT converter valve assembly according to claim 8, characterized in that, The lightning protection device (30) also includes an insulating skirt (34), which surrounds the outer periphery of the insulating cylinder (33).

11. The IGCT converter valve assembly according to claim 10, characterized in that, The insulating skirt (34) is made of rubber material, and the insulating cylinder (33) is provided with a pressure relief groove (331). The insulating skirt (34) covers the outside of the pressure relief groove (331).

12. The IGCT converter valve assembly according to claim 1, characterized in that, A positioning structure is provided between the lightning protection device (30) and its adjacent second heat sink (40). The positioning structure includes a first positioning groove (35), a second positioning groove (43), and a positioning pin (44). The first positioning groove (35) is provided on the lightning protection device (30), the second positioning groove (43) is provided on the second heat sink (40), and the positioning pin (44) is provided in the first positioning groove (35) and the second positioning groove (43).

13. The IGCT converter valve assembly according to claim 1, characterized in that, Each of the lightning protection devices (30) includes a surge arrester (31), a plurality of first heat sinks (20) and a plurality of second heat sinks (40) are arranged in a one-to-one correspondence, and a plurality of conductive busbars (50) are connected in a one-to-one correspondence between the plurality of first heat sinks (20) and the plurality of second heat sinks (40).

14. The IGCT converter valve assembly according to claim 1, characterized in that, The lightning protection device (30) consists of m units, each of which includes n lightning arresters (31). The n lightning arresters (31) are fitted together and electrically connected. The second heat sink (40) consists of m+1 units.

15. The IGCT converter valve assembly according to claim 14, characterized in that, The integrated gate commutated thyristor (10) is The first heat sink (20) is one, and the first heat sink (20) is There are m+1 conductive busbars (50), and the m+1 conductive busbars (50) are arranged one-to-one with the m+1 second heat sinks (40). The second heat sinks (40) and the first heat sinks (20) corresponding to the second heat sinks (40) are electrically connected through one conductive busbar (50). The m and n are both positive integers.

16. The IGCT converter valve assembly according to claim 1, characterized in that, The first direction is perpendicular to the second direction.

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