IGCT single valve structure for converter valve

Abstract

The invention belongs to the technical field of extra-high voltage direct current transmission, and discloses an IGCT single-valve structure for a converter valve. The IGCT single-valve structure comprises a shielding cover assembly, an IGCT valve string unit, a frame assembly, a water pipe assembly, a resistance-capacitance absorption assembly and a water-cooled reactor. Wherein the IGCT valve string unit, the water pipe assembly and the resistance-capacitance absorption assembly are arranged on the frame assembly, and the shielding cover assembly covers the periphery of the outer portion of the frame assembly; the water-cooling reactor is arranged in the shielding case assembly and connected with the frame assembly and the shielding case assembly, and the water pipe assembly is connected with a water path of the water-cooling radiator in the IGCT valve string unit and a water path of the water-cooling reactor. The problem of hidden danger of commutation failure in the traditional direct-current power transmission converter valve technology can be solved, the function of the circuit breaker is added, fault current can be blocked, the new single valve structure can replace the single valve layer of the traditional direct-current power transmission converter valve of the thyristor, and the engineering replacement cost and the operation difficulty are greatly reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of UHV DC transmission, and particularly relates to an IGCT single valve structure for a converter valve. Background Art

[0002] At present, most of the DC transmission projects in operation adopt the LCC (Line Commutated Converter) DC transmission technology. In the case of system disturbances and AC faults, the LCC DC transmission system may experience commutation failure, causing significant active and reactive power impacts on the system, reducing the system stability, and seriously threatening the safe and stable operation of the power grid.

[0003] The core power device used in the field of existing traditional DC transmission converter valves is a thyristor (semi-controlled device). Its valve section structure mainly consists of thyristors, water-cooled radiators, DC voltage-sharing resistors, damping resistors, and thyristor control units. Among them, a thyristor is a semi-controlled device that can only control conduction and cannot control turn-off. Therefore, for an inverter, the converter based on thyristor technology still has a risk of commutation failure. The reason for commutation failure is that the thyristor has a reverse recovery time. When the turn-off angle is insufficient, the voltage is forward-biased in advance, and the thyristor does not have the ability to fully recover the ability to withstand the positive voltage, so it will be re-conducted, resulting in commutation failure, and it does not have the ability to block current when a fault occurs. Summary of the Invention

[0004] In view of the above problems, the present invention provides an IGCT single valve structure for a converter valve, adopting the following technical solutions:

[0005] An IGCT single valve structure for a converter valve includes a shielding cover assembly, an IGCT valve string unit, a frame assembly, a water pipe assembly, a resistor-capacitor absorption assembly, and a water-cooled reactor; wherein, the IGCT valve string unit, the water pipe assembly, and the resistor-capacitor absorption assembly are arranged on the frame assembly, and the shielding cover assembly covers the outer periphery of the frame assembly; the water-cooled reactor is arranged in the shielding cover assembly and is connected to the frame assembly and the shielding cover assembly, and the water pipe assembly is connected to the water circuits of the water-cooled radiator in the IGCT valve string unit and the water-cooled reactor.

[0006] Further, the shielding cover assembly includes a first sealing plate, a second sealing plate, a third sealing plate, a fourth sealing plate, and 4 connecting angle pieces;

[0007] Among them, the first sealing plate, the second sealing plate, the third sealing plate and the fourth sealing plate enclose and form the surrounding fixing structure of the shielding cover assembly. The two ends of the first sealing plate are respectively connected to one end of the second sealing plate and one end of the third sealing plate through two connecting angle pieces. The two ends of the fourth sealing plate are respectively connected to the other end of the second sealing plate and the other end of the third sealing plate through two connecting angle pieces.

[0008] Furthermore, a hoisting hole is provided on the connecting angle piece.

[0009] Furthermore, the frame assembly includes a first frame, a second frame and a third frame;

[0010] Among them, the two ends of the second frame are respectively connected to the first sealing plate and the fourth sealing plate. The first frame and the third frame are arranged on both sides of the second frame. The two ends of the first frame are respectively connected to the first sealing plate and the fourth sealing plate through two insulators. The two ends of the third frame are respectively connected to the first sealing plate and the fourth sealing plate through two insulators.

[0011] Furthermore, two IGCT valve string units and two resistor-capacitor absorption assemblies are provided. The two ends of the first IGCT valve string unit are respectively supported on the first frame and the second frame. The two ends of the second IGCT valve string unit are respectively supported on the second frame and the third frame. The first resistor-capacitor absorption assembly is located on one side of the first IGCT valve string unit, and the two ends of the first resistor-capacitor absorption assembly are respectively supported on the first frame and the second frame. The second resistor-capacitor absorption assembly is located on one side of the second IGCT valve string unit, and the two ends of the second resistor-capacitor absorption assembly are respectively supported on the second frame and the third frame.

[0012] Furthermore, four water-cooled reactors are provided. The first water-cooled reactor and the second water-cooled reactor are arranged on the first installation platform. The four sides of the first installation platform are respectively connected to the first sealing plate, the second sealing plate, the fourth sealing plate and the first frame through insulators. The third water-cooled reactor and the fourth water-cooled reactor are arranged on the second installation platform. The four sides of the second installation platform are respectively connected to the first sealing plate, the third sealing plate, the fourth sealing plate and the third frame through insulators.

[0013] Furthermore, the water pipe assembly includes a main water pipe and branch water pipes. The main water pipe is fixed on the first frame, the second frame and the third frame. The main water pipe is respectively connected to the water circuits of the water-cooled radiators in the IGCT valve string unit and the water circuits of the water-cooled reactors through multiple branch water pipes.

[0014] Furthermore, the IGCT valve string unit includes a pressing component and a valve component. The pressing component is used to press and fix the valve component. The valve component includes n IGCT devices, n + 1 water-cooled radiators, and n lightning arresters, where n is a positive integer;

[0015] Among them, n IGCT devices and n + 1 water-cooled radiators are stacked. The n + 1 water-cooled radiators form n gaps, and the n IGCT devices are arranged one by one in the n gaps. Each lightning arrester is connected to the water-cooled radiator through a connecting busbar.

[0016] Furthermore, it further includes a copper busbar component. The IGCT valve string unit and the water-cooled reactor are connected for current conduction through the copper busbar component.

[0017] Furthermore, the copper busbar component includes 2 connecting copper busbars arranged in each IGCT valve string unit. One end of one connecting copper busbar is pressed between the left pressing piece and the first water-cooled radiator, and one end of the other connecting copper busbar is pressed between the right pressing piece and the (n + 1)th water-cooled radiator.

[0018] Furthermore, the resistor-capacitor absorption component includes a plurality of resistors, a plurality of capacitors, and a fixing bracket. The plurality of resistors are inserted on the water-cooled radiators in the IGCT valve string unit. The plurality of capacitors are fixed on the fixing bracket, and the fixing bracket is connected to the frame component.

[0019] Furthermore, the pressing component includes a first side plate, a second side plate, a pressing component, a left pressing piece, a pull rod component, a right pressing piece, and an adjusting component;

[0020] Among them, the first side plate is detachably connected to the second side plate through the pull rod component. The pressing component is arranged on the first side plate, and the adjusting component is arranged on the second side plate. The pressing component presses the left pressing piece, the valve component, and the right pressing piece in sequence between the first side plate and the adjusting component.

[0021] Advantages of the present invention:

[0022] 1. The single valve structure of the present invention can solve the potential problem of commutation failure in the traditional DC transmission converter valve technology, and at the same time increases the function of the circuit breaker, which can block the fault current. The new single valve structure can replace the single valve layer of the thyristor traditional DC transmission converter valve, greatly reducing the engineering replacement cost and operation difficulty.

[0023] 2. All modules, units, and devices of the single valve structure of the present invention are integrated and uniformly arranged in one unit, with a compact and beautiful structure; the circuit distribution is reasonable.

[0024] 3. The single-valve structure of the present invention is more clearly divided by function, and all valve string units and individual electrical components can be independently installed, disassembled, and maintained. When a fault occurs in the equipment, it is convenient to troubleshoot problems; the parts related to each device and the valve string unit are integrated into one body through the shielding cover assembly connecting the frame assembly to form a single valve. In this way, not only can problems be checked and components be replaced inside the single valve through the mounting plate, which brings great convenience to maintenance and repair, but also a lot of time is saved.

[0025] Other features and advantages of the present invention will be described in the following specification, and in part, will become apparent from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 FIG. shows a schematic diagram of an IGCT single-valve structure for a converter valve according to an embodiment of the present invention;

[0028] Figure 2 FIG. shows Figure 1 a partial enlarged view of part A in

[0029] Figure 3 FIG. shows a schematic diagram of the structure of an IGCT valve string unit according to an embodiment of the present invention.

[0030] In the figure: 1. Shielding cover assembly; 2. Copper busbar assembly; 3. IGCT valve string unit; 4. Frame assembly; 5. Water pipe assembly; 6. RC snubber assembly; 7. Water-cooled reactor; 8. First sealing plate; 9. Second sealing plate; 10. Third sealing plate; 11. Fourth sealing plate; 12. Connecting angle piece; 13. Lifting hole; 14. First frame; 15. Second frame; 16. Third frame; 17. Insulator; 18. Main water pipe; 19. Branch water pipe; 20. IGCT device; 21. Water-cooled radiator; 22. Lightning arrester; 23. First side plate; 24. Second side plate; 25. Compression assembly; 26. Tie rod assembly; 27. Adjusting assembly; 28. Connecting copper busbar; 29. Fixed bracket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0032] It should be noted that the terms "first", "second", etc. in this application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present application described herein. In this application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the accompanying drawings.

[0033] To solve the problem of the insufficient functionality of thyristors in traditional DC transmission equipment, an embodiment of the present invention provides a single valve structure for an HCC (Hybrid Clamped Converter) commutation valve. The thyristor core device is replaced with an IGCT (Intergrated Gate Commutated Thyristors) device, and a new electrical topology is applied. According to the new solution, the single valve structure completed with the new structural layout is more compact in structure and more comprehensive in function, can effectively solve the problem of commutation failure that may occur in traditional commutation valves, and has the function of blocking current when a fault occurs.

[0034] As Figure 1 shown, an IGCT single valve structure for a commutation valve includes a shielding cover assembly 1, a copper busbar assembly 2, an IGCT valve string unit 3, a frame assembly 4, a water pipe assembly 5, a resistor-capacitor absorption assembly 6, and a water-cooled reactor 7.

[0035] Among them, the IGCT valve string unit 3, the water pipe assembly 5, and the resistor-capacitor absorption assembly 6 are arranged on the frame assembly 4, and the shielding cover assembly 1 covers the outside of the frame assembly 4; the water-cooled reactor 7 is arranged in the shielding cover assembly 1 and is connected to the frame assembly 4 and the shielding cover assembly 1. The IGCT valve string unit 3 and the water-cooled reactor 7 are connected for current conduction through the copper busbar assembly 2. The water pipe assembly 5 is connected to the water circuits of the water-cooled radiator 21 in the IGCT valve string unit 3 and the water circuit of the water-cooled reactor 7.

[0036] All modules, units, and devices of the single valve structure in the embodiment of the present invention are uniformly arranged in one unit, with a compact and beautiful structure and reasonable circuit distribution.

[0037] For example, the shielding cover assembly 1 includes a first sealing plate 8, a second sealing plate 9, a third sealing plate 10, and a fourth sealing plate 11. The first sealing plate 8, the second sealing plate 9, the third sealing plate 10, and the fourth sealing plate 11 enclose and form a surrounding fixed structure of the shielding cover assembly 1. There is an installation space inside the shielding cover assembly 1, and the copper busbar assembly 2, the IGCT valve string unit 3, the frame assembly 4, the water pipe assembly 5, the resistor-capacitor absorption assembly 6, and the water-cooled reactor 7 are all arranged inside the shielding cover assembly 1, achieving a good shielding effect.

[0038] For example, the shielding cover assembly 1 further includes 4 connecting angle members 12. Both ends of the first sealing plate 8 are respectively connected to one end of the second sealing plate 9 and one end of the third sealing plate 10 through 2 connecting angle members 12. Both ends of the fourth sealing plate 11 are respectively connected to the other end of the second sealing plate 9 and the other end of the third sealing plate 10 through 2 connecting angle members 12. The shielding cover assembly 1 is installed and fixed by the connecting angle members 12 at the four corners, enhancing the structural strength of the shielding cover assembly 1.

[0039] For example, as Figure 2 shown, a lifting hole 13 is provided on the connecting angle member 12. One end of an insulating suspension rod is connected to the lifting hole 13, and the other end of the insulating suspension rod is connected to the connecting angle member 12 of the upper single valve structure, forming a suspended layer structure, which is convenient for installation and disassembly.

[0040] As Figure 1 shown, for example, the frame assembly 4 includes a first frame 14, a second frame 15, and a third frame 16. Both ends of the second frame 15 are respectively connected to the first sealing plate 8 and the fourth sealing plate 11. The first frame 14 and the third frame 16 are symmetrically arranged on both sides of the second frame 15.

[0041] Both ends of the first frame 14 are respectively connected to the first sealing plate 8 and the fourth sealing plate 11 through 2 insulators 17. Both ends of the third frame 16 are respectively connected to the first sealing plate 8 and the fourth sealing plate 11 through 2 insulators 17.

[0042] Each part of the frame of the frame assembly 4 is connected to the shielding cover assembly 1 through the insulator 17, forming a stable frame structure, which not only enhances the overall strength of the single valve but also reduces the weight, and looks simple and beautiful in appearance.

[0043] For example, the single valve structure includes 2 IGCT valve string units 3, 2 resistor-capacitor absorption assemblies 6, and 4 water-cooled reactors 7. Among them, both ends of the first IGCT valve string unit 3 are respectively supported on the first frame 14 and the second frame 15, and both ends of the second IGCT valve string unit 3 are respectively supported on the second frame 15 and the third frame 16.

[0044] The first resistor-capacitor absorption component 6 is located on one side of the first IGCT valve string unit 3. Both ends of the first resistor-capacitor absorption component 6 are respectively supported on the first frame 14 and the second frame 15. The second resistor-capacitor absorption component 6 is located on one side of the second IGCT valve string unit 3. Both ends of the second resistor-capacitor absorption component 6 are respectively supported on the second frame 15 and the third frame 16.

[0045] The first water-cooled reactor 7 and the second water-cooled reactor 7 are arranged on the first installation platform. The four sides of the first installation platform are respectively connected to the first sealing plate 8, the second sealing plate 9, the fourth sealing plate 11, and the first frame 14 through insulators 17. The third water-cooled reactor 7 and the fourth water-cooled reactor 7 are arranged on the second installation platform. The four sides of the second installation platform are respectively connected to the first sealing plate 8, the third sealing plate 10, the fourth sealing plate 11, and the third frame 16 through insulators 17.

[0046] As Figure 1 shown, for example, the water pipe assembly 5 includes a main water pipe 18 and branch water pipes 19. The main water pipe 18 is fixed to the first frame 14, the second frame 15, and the third frame 16 through pipe clamps, eliminating the vibration generated during the operation of the water system. The main water pipe 18 is respectively connected to the water circuits of the water-cooled radiators 21 in the IGCT valve string unit 3 and the water circuits of the 4 water-cooled reactors 7 through multiple branch water pipes 19. The water flow rates of several water circuits are uniform to ensure effective heat dissipation. The total inlet and outlet of the main water pipe 18 are connected to the water pipes of the valve tower.

[0047] As Figure 3 shown, for example, the IGCT valve string unit 3 includes a press-fitting component and a valve component. The press-fitting component is used to press-fit and fix the valve component. The valve component includes n IGCT devices 20, n + 1 water-cooled radiators 21, and n lightning arresters 22 (MOV), where n is a positive integer.

[0048] Among them, the n IGCT devices 20 and the n + 1 water-cooled radiators 21 are stacked. The n + 1 water-cooled radiators 21 form n gaps. The n IGCT devices 20 are arranged in one-to-one correspondence in the n gaps. The two end faces of the IGCT device 20 in each gap are in contact with the adjacent two water-cooled radiators 21. Each lightning arrester 22 is connected to the water-cooled radiator 21 through a connecting busbar.

[0049] For example, n + 1 water-cooled radiators 21 are grouped for water circuit arrangement. The n + 1 water-cooled radiators 21 are divided into m groups. Each group of water-cooled radiators 21 includes 3 or 4 water-cooled radiators 21 connected in series in a water circuit. Each group of water-cooled radiators 21 has an inlet and an outlet. The inlet and outlet of each group of water-cooled radiators 21 are connected to the main water pipe 18 through a sub-water pipe 19. The internal water circuit of each group of water-cooled radiators 21 is connected through a heat dissipation water pipe. When the IGCT device 20 works, heat is conducted from the water to the outside through the water-cooled radiator 21. The water-cooled radiator 21 not only plays a role in heat dissipation but also has a current-carrying capacity, and can conduct the current of the IGCT device 20 to the next stage.

[0050] As Figure 3 shown, the press-fitting component includes a first side plate 23, a second side plate 24, a pressing component 25, a left press-fitting part, a pull rod component 26, a right press-fitting part, and an adjusting component 27.

[0051] Among them, the first side plate 23 is detachably connected to the second side plate 24 through the pull rod component 26. The pressing component 25 is arranged on the first side plate 23, and the adjusting component 27 is arranged on the second side plate 24. The pressing component 25 presses the left press-fitting part, the valve component, and the right press-fitting part in sequence between the first side plate 23 and the adjusting component 27.

[0052] The press-fitting component fixes the first side plate 23 and the second side plate 24 together through the pull rod component 26, presses the IGCT device 20 and the water-cooled radiator 21 together through the pressing component 25. The adjusting component 27 is used for distance compensation adjustment between the valve component and the left press-fitting part and the right press-fitting part, which is convenient for installation and makes the press-fitting component have a wide application range.

[0053] For example, a first round hole is provided in the middle of the first side plate 23. The pressing component 25 includes a movable block, a disc spring, and a top bolt. The movable block is cylindrical. A stepped surface is provided at the lower end of the movable block. The upper end of the movable block is slidably connected to the first round hole of the first side plate 23. A disc spring is sleeved on the movable block, and the disc spring is arranged between the first side plate 23 and the stepped surface of the movable block. A threaded hole is opened in the middle of the movable block, and the top bolt is provided with an external thread. The top bolt is threadedly connected to the movable block.

[0054] In this embodiment, the pressure of the disc spring can be corrected respectively according to the requirements of the device. The pressure value of the disc spring is formulated according to the requirements of the IGCT device 20. The press-fitting component rotates the top bolt to compress the disc spring to generate pressure, and presses and packages n IGCT devices 20 and n + 1 water-cooled radiators 21 together. The top bolt is threadedly connected to the movable block. When the devices of the power module need to be replaced, adjusting the position of the top bolt can relieve the pressure of the whole module for replacement and maintenance. When reinstalling, as long as the thread is tightened, the devices of the valve component can be press-fitted, which is beneficial to space layout, installation, and maintenance.

[0055] For example, the tie rod assembly 26 includes 4 tie rods, 4 first joints, and 4 second joints. One first joint is provided at the first end of each tie rod, and one second joint is provided at the second end of each tie rod. The 4 tie rods are respectively connected to the first side plate 23 through the 4 first joints, and the 4 tie rods are connected to the second side plate 24 through the 4 second joints. The telescopic lengths of the first joint and the second joint are adjustable, so that the distance between the first side plate 23 and the second side plate 24 can be adjusted through the tie rod assembly 26.

[0056] For example, the adjusting assembly 27 includes a connecting nut and an adjusting bolt. A second round hole is provided in the middle of the second side plate 24. The connecting nut is arranged inside the second side plate 24 and is concentric with the second round hole. The screw rod of the adjusting bolt is threadedly connected to the connecting nut, and the head of the adjusting bolt abuts against the right press-fitting part. By rotating the adjusting bolt, the distance between the right press-fitting part and the left press-fitting part can be adjusted, which can compensate for the assembly error and manufacturing dimension error of each device, and together with the pressing assembly 25, ensure that the pressing pressure of the IGCT device 20 meets the requirements.

[0057] For example, the IGCT valve string unit 3 includes 12 IGCT devices 20, 13 water-cooled radiators 21, and 12 lightning arresters 22 (MOV). The 13 water-cooled radiators 21 form 12 gaps, and one IGCT device 20 is arranged in each gap.

[0058] For example, the electrical equipment in the single valve structure is connected through the copper busbar assembly 2 and cables. The copper busbar assembly 2 includes 2 connecting copper busbars 28 arranged in each IGCT valve string unit 3. One end of one connecting copper busbar 28 is press-fitted between the left press-fitting part and the first water-cooled radiator 21, and one end of the other connecting copper busbar 28 is press-fitted between the right press-fitting part and the (n + 1)th water-cooled radiator 21.

[0059] The first water-cooled reactor 7, the second water-cooled reactor 7, and one connecting copper busbar 28 of the first IGCT valve string unit 3 are connected in series. The other connecting copper busbar 28 of the first IGCT valve string unit 3 is connected to one connecting copper busbar 28 of the second IGCT valve string unit 3. The other connecting copper busbar 28 of the second IGCT valve string unit 3 is connected in series with the third water-cooled reactor 7 and the fourth water-cooled reactor 7, forming a U-shaped sequential connection layout from the two water-cooled reactors 7 to the IGCT valve string unit 3 and then back to the two water-cooled reactors 7, making full use of the space inside the shielding cover assembly 1 and having a beautiful structure.

[0060] For example, the connecting copper busbar 28 can be selected as a flexible copper busbar to compensate for the spatial position, remove the copper busbar stress, and reduce the copper busbar stray inductance.

[0061] Such as Figure 1As shown, for example, the resistor-capacitor absorption component 6 includes a plurality of resistors, a plurality of capacitors, and a fixing bracket 29. The plurality of resistors are inserted into the water-cooled radiator 21 within the IGCT valve string unit, the plurality of capacitors are fixed to the fixing bracket 29, and the fixing bracket 29 is connected to the frame assembly 4. For example, the fixing bracket 29 of the first resistor-capacitor absorption component 6 is connected to the first frame 14 and the second frame 15, and the fixing bracket 29 of the second resistor-capacitor absorption component 6 is connected to the second frame 15 and the third frame 16.

[0062] For example, the number of resistors and capacitors is correspondingly set to n according to the number of IGCT devices 20 within the IGCT valve string unit 3.

[0063] The IGCT single valve structure for the commutation valve according to the embodiment of the present invention can solve the potential problem of commutation failure existing in the traditional DC transmission commutation valve technology. At the same time, it adds the function of a circuit breaker and can block the fault current. The new single valve structure can replace the single valve layer of the thyristor traditional DC transmission commutation valve, greatly reducing the engineering replacement cost and operation difficulty.

[0064] The single valve structure according to the embodiment of the present invention is more clearly divided by function, and all valve string units and individual electrical components can be independently installed, disassembled, and maintained. When a fault occurs in the equipment, it is convenient to troubleshoot problems; the parts related to each device and the valve string unit are integrated into one body through the shielding cover assembly 1 connecting to the frame assembly 4 to form a single valve. In this way, not only can problems be checked and components be replaced inside the single valve through the mounting plate, which brings great convenience to maintenance and repair, but also a lot of time is saved.

[0065] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An IGCT single valve structure for a converter valve, characterized in that, it includes a shielding cover assembly, an IGCT valve string unit, a frame assembly, a water pipe assembly, a resistor-capacitor absorption assembly, and a water-cooled reactor; wherein, the IGCT valve string unit, the water pipe assembly, and the resistor-capacitor absorption assembly are arranged on the frame assembly, and the shielding cover assembly covers the outer periphery of the frame assembly; the water-cooled reactor is arranged in the shielding cover assembly and is connected to the frame assembly and the shielding cover assembly, and the water pipe assembly is connected to the water circuits of the water-cooled radiators in the IGCT valve string unit and the water-cooled reactor.

2. The IGCT single valve structure for a converter valve according to claim 1, characterized in that, the shielding cover assembly includes a first sealing plate, a second sealing plate, a third sealing plate, a fourth sealing plate, and 4 connecting angle pieces; wherein, the first sealing plate, the second sealing plate, the third sealing plate, and the fourth sealing plate enclose and form a fixed structure around the shielding cover assembly. The two ends of the first sealing plate are respectively connected to one end of the second sealing plate and one end of the third sealing plate through 2 connecting angle pieces, and the two ends of the fourth sealing plate are respectively connected to the other end of the second sealing plate and the other end of the third sealing plate through 2 connecting angle pieces.

3. The IGCT single valve structure for a converter valve according to claim 2, characterized in that, lifting holes are arranged on the connecting angle pieces.

4. The IGCT single valve structure for a converter valve according to claim 2, characterized in that, the frame assembly includes a first frame, a second frame, and a third frame; wherein, the two ends of the second frame are respectively connected to the first sealing plate and the fourth sealing plate. The first frame and the third frame are arranged on both sides of the second frame. The two ends of the first frame are respectively connected to the first sealing plate and the fourth sealing plate through 2 insulators, and the two ends of the third frame are respectively connected to the first sealing plate and the fourth sealing plate through 2 insulators.

5. The IGCT single valve structure for a converter valve according to claim 4, characterized in that, both 2 IGCT valve string units and 2 resistor-capacitor absorption assemblies are provided. The two ends of the first IGCT valve string unit are respectively supported on the first frame and the second frame. The two ends of the second IGCT valve string unit are respectively supported on the second frame and the third frame. The first resistor-capacitor absorption assembly is located on one side of the first IGCT valve string unit, and the two ends of the first resistor-capacitor absorption assembly are respectively supported on the first frame and the second frame. The second resistor-capacitor absorption assembly is located on one side of the second IGCT valve string unit, and the two ends of the second resistor-capacitor absorption assembly are respectively supported on the second frame and the third frame.

6. The IGCT single valve structure for a converter valve according to claim 4, characterized in that, There are 4 water-cooled reactors. The first water-cooled reactor and the second water-cooled reactor are arranged on the first installation platform. The four sides of the first installation platform are respectively connected to the first sealing plate, the second sealing plate, the fourth sealing plate, and the first frame through insulators; the third water-cooled reactor and the fourth water-cooled reactor are arranged on the second installation platform. The four sides of the second installation platform are respectively connected to the first sealing plate, the third sealing plate, the fourth sealing plate, and the third frame through insulators.

7. The IGCT single valve structure for a converter valve according to claim 4, wherein, the water pipe assembly includes a main water pipe and branch water pipes. The main water pipe is fixed on the first frame, the second frame, and the third frame. The main water pipe is respectively connected to the water circuits of the water-cooled radiators and the water circuits of the water-cooled reactors in the IGCT valve string unit through multiple branch water pipes.

8. The IGCT single valve structure for a converter valve according to any one of claims 1-7, wherein, the IGCT valve string unit includes a pressing component and a valve component. The pressing component is used for pressing and fixing the valve component. The valve component includes n IGCT devices, n + 1 water-cooled radiators, and n lightning arresters, where n is a positive integer; wherein, the n IGCT devices and the n + 1 water-cooled radiators are stacked. The n + 1 water-cooled radiators form n gaps. The n IGCT devices are respectively arranged in the n gaps one by one. Each lightning arrester is connected to the water-cooled radiator through a connecting busbar.

9. The IGCT single valve structure for a converter valve according to claim 8, wherein, it further includes a copper busbar assembly. The IGCT valve string unit and the water-cooled reactor are connected for current conduction through the copper busbar assembly.

10. The IGCT single valve structure for a converter valve according to claim 9, wherein, the copper busbar assembly includes 2 connecting copper busbars arranged in each IGCT valve string unit. One end of one connecting copper busbar is pressed between the left pressing part and the first water-cooled radiator, and one end of the other connecting copper busbar is pressed between the right pressing part and the (n + 1)th water-cooled radiator.

11. The IGCT single valve structure for a converter valve according to claim 1, wherein, the resistor-capacitor absorption assembly includes a plurality of resistors, a plurality of capacitors, and a fixing bracket. The plurality of resistors are inserted on the water-cooled radiators in the IGCT valve string unit. The plurality of capacitors are fixed on the fixing bracket, and the fixing bracket is connected to the frame assembly.

12. The IGCT single valve structure for a converter valve according to claim 8, wherein, the pressing component includes a first side plate, a second side plate, a pressing assembly, a left pressing part, a pull rod assembly, a right pressing part, and an adjusting assembly; wherein, the first side plate is detachably connected to the second side plate through the pull rod assembly. The pressing assembly is arranged on the first side plate. The adjusting assembly is arranged on the second side plate. The pressing assembly presses the left pressing part, the valve component, and the right pressing part in sequence between the first side plate and the adjusting assembly.

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