IGCT converter valve

Abstract

The invention relates to the technical field of converter valves, and discloses an IGCT converter valve which comprises at least two valve layers, a top shielding cover and a bottom shielding cover, the valve layers are arranged in an up-down stacked mode, the top shielding cover is located at the top end of the uppermost valve layer, and the bottom shielding cover is located at the bottom end of the lowermost valve layer. The lower valve layer is connected to the bottom end of the upper valve layer in a suspended mode. The converter valve is high in integrity, compact in structure and reasonable in layout, and the valve layers are connected in series through flexible insulators, so that the overall anti-seismic performance and stability of the converter valve are obviously improved; each valve layer is used as an independent unit and is assembled in an open manner, so that each valve layer is convenient to mount and dismount, and the application range of the converter valve is expanded. In addition, the converter valve adopts a suspension structure, and compared with a mixed type controllable commutation converter valve device, the converter valve can effectively reduce the occupied area of the whole converter valve when being applied to a high-pressure occasion.

Description

Technical Field

[0001] The present invention relates to the technical field of converter valves, and in particular to an IGCT converter valve. Background Art

[0002] UHV DC transmission usually adopts grid-commutated current conversion technology (LCC). While it is developing rapidly, some problems that are difficult to solve at this stage have emerged. In particular, LCC commutation technology uses half-controlled thyristor devices, which cannot shut off the current and have the inherent problem of commutation failure. When the AC grid voltage is disturbed, it is easy to cause commutation failure in the receiving-end converter, resulting in a series of problems such as interruption of DC power transmission and overvoltage at the sending end, which seriously affects the safety and stability of the power grid. Flexible DC transmission technology uses fully controlled IGBT devices, which have limited overvoltage and overcurrent tolerance and the problem of DC short-circuit faults being difficult to clear by themselves. When a short-circuit fault occurs in the DC system, the fault current develops rapidly and is difficult to cut off. It needs to be controlled by a DC circuit breaker or a full-bridge converter, which greatly increases the investment in the project and has poor technical and economic performance. In contrast, integrated gate-commutated thyristors (IGCTs) have made great progress in manufacturing processes and operating losses. It is a fully controlled current-controlled switching device with reverse blocking capability, which has the advantages of high withstand voltage, large through-current, low conduction voltage drop, high reliability and low manufacturing cost. Its low switching frequency operation characteristics are well matched with LCC commutation technology. The IGCT-based converter valve can effectively resist commutation failure, actively shut down the current under fault conditions, shorten the fault time, reduce the disturbance of the DC system to the AC system, and improve the safe and stable operation capability of the DC system.

[0003] At present, there is also a new commutation idea that mixes half-controlled and fully-controlled devices. The thyristor current is transferred through fully-controlled devices (such as IGBTs), and after the thyristor recovers its shut-off capability, the fully-controlled devices are used to cut off the current and quickly restore the commutation between the bridge arms. However, this hybrid commutation valve has a bloated structure and occupies a large area. Summary of the invention

[0004] In view of the above problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the present invention aims to provide an IGCT converter valve, the purpose of which is:

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an IGCT converter valve, comprising:

[0007] A valve layer, a top shielding cover, and a bottom shielding cover, wherein the valve layer is at least two layers and is stacked up and down, the top shielding cover is located at the top of the uppermost valve layer, the bottom shielding cover is located at the bottom of the lowermost valve layer, and the lower valve layer is suspended and connected to the bottom of the upper valve layer.

[0008] As a preferred solution of the IGCT converter valve of the present invention, the valve layer comprises two groups of valve modules arranged side by side in the horizontal direction, and the valve layer is arranged in a "U" shape horizontally;

[0009] Wherein, each group of the valve modules is composed of two groups of IGCT valve assemblies connected in series.

[0010] As a preferred solution of the IGCT converter valve of the present invention, each group of the IGCT valve components includes an IGCT silicon stack, and a damping capacitor component, a power supply component, a lightning arrester component and a reactor connected to the IGCT silicon stack;

[0011] Among them, the reactor is set into two groups and installed side by side in the middle position of the valve module where it is located. The IGCT silicon stack, the damping capacitor assembly, the power supply assembly, and the lightning arrester assembly are arranged side by side and arranged in parallel in the front-to-back direction, and are located on the outside of the corresponding reactor.

[0012] As a preferred solution of the IGCT converter valve of the present invention, it further comprises a valve module frame for suspending each valve layer, and two groups of adjacent valve module frames are connected by composite insulators, and the upper and lower layers are suspended and connected by insulator blocks;

[0013] Among them, one side of the two valve modules on the same layer is connected by a straight row, so that the valve layer is electrically connected in a U-shape, and the upper and lower valve layers are electrically connected by a busbar, and the busbar is arranged inclined as a whole.

[0014] As a preferred solution of the IGCT converter valve of the present invention, copper bars are used in series between two groups of reactors in the same valve module, and between each group of reactors and its corresponding IGCT silicon stack.

[0015] As a preferred solution of the IGCT converter valve of the present invention, the IGCT silicon stack includes a fixed frame adapted to be installed on the top of the valve module frame, a radiator adapted to be installed side by side inside the fixed frame, and an IGCT element adapted to be installed inside the fixed frame;

[0016] The heat sinks are arranged in multiple groups inside the fixed frame, and the IGCT elements are adapted to be installed between adjacent heat sinks, and a voltage-equalizing resistor is adapted to be installed on the outer side of each group of heat sinks.

[0017] As a preferred solution of the IGCT converter valve of the present invention, the power supply assembly and the lightning arrester assembly are located between the damping capacitor assembly and the IGCT silicon stack, and the power supply assembly and the lightning arrester assembly are installed on the same mounting plate, forming an integrated design.

[0018] As a preferred solution of the IGCT converter valve of the present invention, at least four groups of cooling components are arranged between the two groups of valve layers, and each group of valve modules is designed correspondingly to the two groups of cooling components;

[0019] Among them, the cooling component includes an inlet pipe and a return pipe, the inlet pipe and the return pipe are of spiral ring design and are connected to the upper and lower water pipes, and the inlet pipe and the return pipe are both arranged close to the side wall of the converter valve.

[0020] As a preferred solution of the IGCT converter valve of the present invention, wherein: the valve layer is correspondingly provided with an inspection channel, the inspection channel is suspended below the valve layer through an insulating material, and the inspection channel is located between two groups of the valve modules, and the horizontal plane where the inspection channel is located is lower than the horizontal plane where the valve layer of the current layer is located, and higher than the horizontal plane where the valve layer of the lower layer is located;

[0021] Among them, at least four optical cable troughs are arranged between the valve layers, each group of the valve modules is designed corresponding to two groups of the optical cable troughs, the optical cable troughs are composed of a trough box and a trough cover, and the optical cable troughs are arranged in an up and down S shape along the vertical direction of the inner side of the valve layer.

[0022] As a preferred solution of the IGCT converter valve of the present invention, side shielding covers are installed around the frame of the valve layer, the inner top of the bottom shielding cover is designed as a slope, the junction of two groups of slopes forms a guide groove, and a water leakage detector is installed inside the guide groove.

[0023] Beneficial effects of the present invention:

[0024] 1. The converter valve module has a compact structure and occupies a small space. The valve layers of the converter valve are arranged in a "U" shape horizontally, which ensures the stability of the IGCT converter valve;

[0025] 2. Each valve layer of the converter valve is completely independent mechanically, and the number of valve layers can be adjusted according to the voltage occasion, which is convenient for disassembly and assembly;

[0026] 3. The converter valve of the present invention adopts a suspension structure, and flexible busbars are used to connect the reactor components and the reactor components and the silicon stack, thereby further improving its stability and anti-seismic performance;

[0027] 4. The arrangement of the electrical components in each valve layer of the present invention can further increase the compactness and stability of the converter valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0030] Figure 2 It is a schematic diagram of the main structure of the present invention.

[0031] Figure 3 It is a schematic diagram of the structure of a separate valve layer of the present invention.

[0032] Figure 4 It is a schematic diagram of the valve module structure of the present invention.

[0033] Figure 5 It is a bottom view structural schematic diagram of the valve module of the present invention.

[0034] Figure 6 It is a schematic diagram of the bottom shielding cover structure of the present invention. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0038] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0039] Example 1

[0040] Reference Figure 1 to Figure 6 , which is the first embodiment of the present invention, provides an IGCT converter valve, the device comprising:

[0041] The valve layer 100, the top shielding cover 200, and the bottom shielding cover 300, the valve layer 100 is at least two layers, and is stacked up and down, the top shielding cover 200 is located at the top of the uppermost valve layer 100, the bottom shielding cover 300 is located at the bottom of the lowermost valve layer 100, and the lower valve layer 100 is suspended and connected to the bottom of the upper valve layer 100.

[0042] Further, the valve layer 100 includes two groups of valve modules 101 arranged side by side in the horizontal direction, and the valve layer 100 is arranged in a "U" shape horizontally;

[0043] Each valve module 101 is composed of two groups of IGCT valve assemblies 102 connected in series.

[0044] Furthermore, each set of IGCT valve components 102 includes an IGCT silicon stack 102a, and a damping capacitor component 102b, a power supply component 102c, a lightning arrester component 102d, and a reactor 102e connected to the IGCT silicon stack 102a;

[0045] Among them, the inductor 102e is set into two groups and installed side by side in the middle position of the valve module 101 where it is located. The IGCT silicon stack 102a, damping capacitor assembly 102b, power supply assembly 102c, and lightning arrester assembly 102d are arranged side by side and arranged in parallel in the front-to-back direction, and are located on the outside of the corresponding inductor 102e.

[0046] Specifically, it also includes a valve module frame 400 for suspending each valve layer 100, and two sets of adjacent valve module frames 400 are connected by a composite insulator 500, and the upper and lower layers are suspended and connected by an insulator block 600. After the valve layer is suspended by the insulator block 600, the entire converter valve constitutes a flexible system from top to bottom. When encountering strong external forces such as earthquakes, the valve layer 100 can swing within a certain range without damaging the overall structure. After the strong external forces such as earthquakes disappear, the converter valve can continue to operate.

[0047] Among them, one side of the two valve modules 101 on the same layer is connected by a straight bus 700, so that the valve layer 100 is electrically connected in a U-shape, and the upper and lower valve layers 100 are electrically connected through a busbar 800, and the busbar 800 is arranged in an inclined manner as a whole. The U-shape is used to facilitate the electrical busbar connection, and space is reserved for arranging the maintenance channel 110, which is convenient for installation and maintenance;

[0048] The design of oblique busbar 800 can reduce the height between the upper and lower valve layers and the overall size of the equipment, making the converter valve more compact as a whole.

[0049] Preferably, copper bars 102f are used in series between two groups of reactors 102e of the same valve module 101, and between each group of reactors 102e and its corresponding IGCT silicon stack 102a.

[0050] It should be noted that the IGCT silicon stack 102a includes a fixed frame 102a-1 adapted to be installed on the top of the valve module frame 400, a heat sink 102a-2 adapted to be installed side by side inside the fixed frame 102a-1, and an IGCT element 102a-3 adapted to be installed inside the fixed frame 102a-1;

[0051] Preferably, the heat sinks 102a-2 are arranged in multiple groups inside the fixed frame 102a-1, and the IGCT elements 102a-3 are adapted to be installed between adjacent heat sinks 102a-2, and a voltage-equalizing resistor 102a-4 is adapted to be installed outside each group of heat sinks 102a-2.

[0052] Preferably, the power supply component 102c and the lightning arrester component 102d are located between the damping capacitor component 102b and the IGCT silicon stack 102a, and the power supply component 102c and the lightning arrester component 102d are installed on the same mounting plate, forming an integrated design. The integrated design can further reduce the space required for the entire converter valve, and further increase the compactness and stability of the converter valve.

[0053] In summary, the converter valve has strong integrity, compact structure, and reasonable layout. Flexible insulators are used in series between the valve layers 100, which significantly improves its overall anti-seismic performance and stability. Each valve layer 100 is assembled in an open manner as a separate unit, which facilitates the installation and disassembly of each valve layer 100, thereby increasing the application range of the converter valve. In addition, the converter valve adopts a suspension structure, which can effectively reduce the footprint of the entire converter valve when used in high-voltage applications compared to the hybrid controllable phase-changing converter valve device.

[0054] Example 2

[0055] Reference Figure 1 to Figure 6 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that at least four groups of cooling components 900 are arranged between the two groups of valve layers 100, and each group of valve modules 101 is designed corresponding to the two groups of cooling components 900;

[0056] Among them, the cooling component 900 includes an inlet pipe 901 and a return pipe 902. The inlet pipe 901 and the return pipe 902 are of spiral ring design and are connected to the upper and lower water pipes. The inlet pipe 901 and the return pipe 902 are both arranged close to the side wall of the converter valve.

[0057] The spiral ring design of the water inlet pipe 901 and the water return pipe 902 can increase the creepage distance as much as possible within a limited height dimension, thereby reducing the height of the upper and lower layers; the external design is convenient for maintenance and maintains a certain physical isolation from electrical components to ensure safety.

[0058] Furthermore, the valve layer 100 is provided with a maintenance channel 110, which is suspended below the valve layer 100 through insulating materials, and the maintenance channel 110 is located between the two groups of valve modules 101, and the horizontal plane where the maintenance channel 110 is located is lower than the horizontal plane where the valve layer 100 of the current layer is located, and higher than the horizontal plane where the valve layer 100 of the lower layer is located;

[0059] Among them, at least four optical cable troughs 120 are arranged between the valve layers 100, each group of valve modules 101 is designed corresponding to two groups of optical cable troughs 120, the optical cable troughs 120 are composed of a trough box and a trough cover, and the optical cable troughs 120 are arranged in an S shape along the vertical direction of the inner side of the valve layer 100.

[0060] By limiting the number of the optical cable troughs 120 and the valve modules 101, the optical cable troughs 120 can be made to correspond to the IGCT silicon stacks 102a in the valve module 101, which is convenient for optical fiber routing. At the same time, the S-shaped arrangement can increase the creepage distance as much as possible within a limited height dimension, thereby reducing the height of the upper and lower layers. While reducing the overall size of the converter valve, it ensures that there is a sufficient creepage distance, and is also convenient for maintenance and physical isolation from electrical components.

[0061] Example 3

[0062] Reference Figure 1 to Figure 6 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: side shielding covers 130 are installed around the frame of the valve layer 100, the inner top of the bottom shielding cover 300 is designed as an inclined surface 301, and the junction of the two groups of inclined surfaces 301 forms a guide groove 302, and a water leakage detector 303 is installed inside the guide groove 302.

[0063] Side shielding covers 130 are installed around the frame of the valve layer 100, forming shielding protection for the converter valve together with the top shielding cover 200 and the bottom shielding cover 300, which plays a key role in improving the electric field distribution of the converter valve in the high-voltage electric field.

[0064] In summary, the water leakage detector 303 is used to detect the leakage of the converter valve, and can realize two-level monitoring. If the leakage of the converter valve is very small and not enough to cause damage to the equipment, the water leakage detector will send out an alarm signal; if the leakage is large and affects the normal operation of the equipment, the water leakage detector will send out a trip signal; at the same time, with the design of the slope 301 and the guide groove 302, it can ensure that the water source of the converter valve leakage is concentrated, realize accurate detection, improve the accuracy of detection, and avoid false alarms.

Claims

1. An IGCT converter valve, characterized in that: include, A valve layer (100), a top shielding cover (200), and a bottom shielding cover (300), wherein the valve layer (100) is at least two layers and is stacked up and down, the top shielding cover (200) is located at the top of the uppermost valve layer (100), the bottom shielding cover (300) is located at the bottom of the lowermost valve layer (100), and the lower valve layer (100) is suspended and connected to the bottom of the upper valve layer (100).

2. The IGCT converter valve according to claim 1, characterized in that: The valve layer (100) comprises two groups of valve modules (101) arranged side by side in a horizontal direction, and the valve layer (100) is arranged horizontally in a "U" shape; Each group of the valve modules (101) is composed of two groups of IGCT valve assemblies (102) connected in series.

3. The IGCT converter valve according to claim 2, characterized in that: Each group of the IGCT valve components (102) includes an IGCT silicon stack (102a), and a damping capacitor component (102b), a power supply component (102c), a lightning arrester component (102d), and a reactor (102e) connected to the IGCT silicon stack (102a); The reactor (102e) is arranged in two groups and installed side by side in the middle position of the valve module (101) in which it is located; the IGCT silicon stack (102a), the damping capacitor assembly (102b), the power supply assembly (102c), and the lightning arrester assembly (102d) are arranged side by side and arranged in parallel in the front-to-back direction, and are located outside the corresponding reactor (102e).

4. The IGCT converter valve according to claim 3, characterized in that: It also includes a valve module frame (400) for suspending each valve layer (100), and two adjacent groups of the valve module frames (400) are connected by a composite insulator (500), and the upper and lower layers are suspended and connected by an insulator block (600); Among them, one side of the two valve modules (101) on the same layer is connected by a straight bus (700), so that the valve layer (100) is electrically U-shaped, and the upper and lower valve layers (100) are electrically connected by a bus bar (800), and the bus bar (800) is arranged inclined as a whole.

5. The IGCT converter valve according to claim 4, characterized in that: Copper bars (102f) are respectively used to connect two groups of reactors (102e) of the same valve module (101) in series, and each group of reactors (102e) and its corresponding IGCT silicon stack (102a).

6. The IGCT converter valve according to claim 4 or 5, characterized in that: The IGCT silicon stack (102a) comprises a fixed frame (102a-1) adapted to be installed on the top of the valve module frame (400), a radiator (102a-2) adapted to be installed side by side inside the fixed frame (102a-1), and an IGCT element (102a-3) adapted to be installed inside the fixed frame (102a-1); The heat sinks (102a-2) are arranged in multiple groups inside the fixed frame (102a-1), and the IGCT elements (102a-3) are adapted to be installed between adjacent heat sinks (102a-2), and a voltage-equalizing resistor (102a-4) is adapted to be installed on the outside of each group of heat sinks (102a-2).

7. The IGCT converter valve according to claim 6, characterized in that: The power supply component (102c) and the lightning arrester component (102d) are located between the damping capacitor component (102b) and the IGCT silicon stack (102a), and the power supply component (102c) and the lightning arrester component (102d) are installed on the same mounting plate, presenting an integrated design.

8. The IGCT converter valve according to claim 7, characterized in that: At least four groups of cooling components (900) are arranged between the two groups of valve layers (100), and each group of valve modules (101) is designed correspondingly to the two groups of cooling components (900); The cooling assembly (900) includes a water inlet pipe (901) and a water return pipe (902), wherein the water inlet pipe (901) and the water return pipe (902) are of spiral ring design and are connected to the upper and lower water pipes, and the water inlet pipe (901) and the water return pipe (902) are both arranged close to the side wall of the converter valve.

9. The IGCT converter valve according to claim 8, characterized in that: The valve layer (100) is provided with a maintenance channel (110) correspondingly, the maintenance channel (110) is suspended below the valve layer (100) through an insulating material, and the maintenance channel (110) is located between two groups of valve modules (101), and the horizontal plane where the maintenance channel (110) is located is lower than the horizontal plane where the valve layer (100) of the current layer is located, and higher than the horizontal plane where the valve layer (100) of the lower layer is located; At least four optical cable troughs (120) are arranged between the valve layers (100), each group of the valve modules (101) is designed correspondingly to two groups of the optical cable troughs (120), the optical cable troughs (120) are composed of a trough box and a trough cover, and the optical cable troughs (120) are arranged in an up-and-down S-shape along the vertical direction of the inner side of the valve layer (100).

10. The IGCT converter valve according to claim 8 or 9, characterized in that: Side shielding covers (130) are installed around the frame of the valve layer (100), the inner top of the bottom shielding cover (300) is designed as a slope (301), and the junction of two groups of slopes (301) forms a guide groove (302), and a water leakage detector (303) is installed inside the guide groove (302).

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