Converter valve group and DC transmission system

Abstract

The present disclosure relates to a converter valve group and a direct current transmission system. The converter valve group includes a converter valve string and a cooling circuit. The converter valve string includes a multi-stage converter valve unit connected in series in a first direction. The converter valve unit includes a converter valve module and a damping circuit. The converter valve module includes a converter valve and a radiator arranged beside the converter valve. The damping circuit is connected in parallel with the converter valve, and includes a water-cooled damping resistor and a damping capacitor arranged in a second direction away from the converter valve and connected in series. The second direction intersects with the first direction. The cooling circuit includes: a main cooling channel extending in the first direction, a first cooling circuit connecting the main cooling channel and the water-cooled damping resistor, and a second cooling circuit connecting the main cooling channel and the radiator. The present disclosure can reduce the size of the radiator, reduce the weight of the converter valve string, and improve the reliability of the converter valve group, thereby facilitating the improvement of the structural stability and insulation characteristics of the converter valve group.

Description

Technical Field

[0001] The present disclosure relates to the technical field of direct current transmission, and in particular to a converter valve group and a direct current transmission system. Background Art

[0002] As one of the core components of high-voltage or ultra-high-voltage direct current transmission systems, the performance of the converter valve directly affects the operational reliability and stability of the direct current transmission system. However, the series connection of the converter valves in the converter valve group is easy to affect the structural stability of the converter valve group due to its large weight and small packaging pressure, and it is also easy to cause greater thermal resistance, resulting in the need for a large-sized heat sink, which further affects the structural stability of the converter valve group and its insulation characteristics. Summary of the invention

[0003] Based on this, the embodiments of the present disclosure provide a converter valve group and a DC power transmission system, which can reduce the size of the radiator, reduce the weight of the converter valve module, and improve the reliability of the converter valve group, thereby facilitating improving the structural stability of the converter valve group and its insulation characteristics.

[0004] In order to achieve the above-mentioned objectives, in a first aspect, some embodiments of the present disclosure provide a converter valve group, comprising: a converter valve string and a cooling circuit. The converter valve string comprises a multi-stage converter valve unit connected in series in sequence along a first direction. The converter valve unit comprises a converter valve module and a damping circuit. The converter valve module comprises a converter valve and a radiator arranged next to the converter valve. The damping circuit is connected in parallel with the converter valve, and comprises a water-cooled damping resistor and a damping capacitor arranged in series and connected in a second direction away from the converter valve. The second direction intersects with the first direction. The cooling circuit comprises: a main cooling channel extending along the first direction, a first cooling circuit connecting the main cooling channel and the water-cooled damping resistor, and a second cooling circuit connecting the main cooling channel and the radiator.

[0005] In some embodiments of the present disclosure, the main cooling channel is located between the converter valve and the water-cooled damping resistor of each converter valve unit. At least two converter valve units are grouped together, and the first cooling circuit and the second cooling circuit corresponding to the converter valve units in the same group are connected in series.

[0006] In some embodiments of the present disclosure, the converter valve includes an anode, and the size of the radiator is not greater than the table size of the anode.

[0007] In some embodiments of the present disclosure, the converter valve group further includes: a valve string support structure. The valve string support structure includes: an insulating support plate and at least one insulating support block. The insulating support plate is located on the upper and lower sides of the converter valve string. The insulating support block connects the insulating support plates on the upper and lower sides and is located between adjacent target converter valve units. The insulating support block is used to equidistantly separate multiple converter valve units in the converter valve string.

[0008] In some embodiments of the present disclosure, the insulating support plate extends along a first direction, and lead grooves are provided on both side edges of the insulating support plate parallel to the first direction.

[0009] In some embodiments of the present disclosure, the valve string segmented support structure further includes: a head end flange and a tail end flange located at both ends of the insulating support plate and connected to the insulating support plates on the upper and lower sides respectively.

[0010] In some embodiments of the present disclosure, the converter valve group further includes: a locking structure, a pressure equalizing structure, and an elastic anti-loosening structure. The locking structure is located in the valve string support structure and close to the head end flange, and is used to lock and maintain the valve string pressure of the converter valve string. The pressure equalizing structure is located between the locking structure and the converter valve string, and is used to conduct and equalize the valve string pressure of the converter valve string. The elastic anti-loosening structure is located in the valve string support structure and between the converter valve string and the tail end flange, and is used to pre-tighten and limit the converter valve string.

[0011] In some embodiments of the present disclosure, the converter valve includes a thyristor device and an integrated gate driver connected to the thyristor device. The converter valve group also includes a bearing frame and a drive fixing structure. The bearing frame is used to carry the converter valve string and the valve string support structure. The drive fixing structure is flexibly connected to the bearing frame and includes a shielding box accommodating area corresponding to the converter valve one by one; wherein the integrated gate driver is installed in the shielding box accommodating area.

[0012] In some embodiments of the present disclosure, the integrated gate driver is provided with a positioning groove, and the driving fixing structure further includes an elastic positioning member matching the positioning groove and used for engaging with the positioning groove.

[0013] In a second aspect, some embodiments of the present disclosure further provide a direct current transmission system, comprising the converter valve group described in any of the above embodiments.

[0014] The embodiments of the present disclosure may or at least have the following advantages:

[0015] In the embodiment of the present disclosure, the multi-stage converter valve units are connected in series in sequence along the first direction to form a converter valve string, the radiator is arranged beside the corresponding converter valve along the first direction, and the water-cooled damping resistor is arranged along the second direction away from the converter valve. The water-cooled damping resistor and the radiator can be separately arranged, and cooling circuits are independently arranged for the water-cooled damping resistor and the radiator, such as a first cooling circuit connecting the main cooling channel and the water-cooled damping resistor, and a second cooling circuit connecting the main cooling channel and the radiator. In this way, the embodiment of the present disclosure does not need to insert the damping resistor into the interior of the radiator for cooling, which can not only reduce the size of the radiator, but also facilitate the modular integration of each component, so that after the modules are integrated, they can be assembled and the electrical connection and water connection can be made, thereby reducing the assembly complexity of the converter valve group, and improving the structural stability and insulation characteristics of the converter valve group, as well as improving the press-fit efficiency and overall reliability of the converter valve group.

[0016] The details of one or more embodiments of the present disclosure are set forth in the following drawings and description. Other features, objects, and advantages of the present disclosure will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the electrical principle of a converter valve group provided in some embodiments;

[0019] Figure 2 A three-dimensional schematic diagram of the front side of a converter valve group provided in some embodiments;

[0020] Figure 3 A three-dimensional schematic diagram of the rear side of a converter valve group provided in some embodiments;

[0021] Figure 4 A schematic top view of a converter valve group provided in some embodiments;

[0022] Figure 5 A bottom view schematic diagram of a converter valve group provided in some embodiments;

[0023] Figure 6 A three-dimensional schematic diagram of another flow conversion valve group provided in some embodiments;

[0024] Figure 7 A three-dimensional schematic diagram of a converter valve string support structure and a converter valve string provided in some embodiments;

[0025] Figure 8 A three-dimensional schematic diagram of a converter valve string support structure provided in some embodiments;

[0026] Fig. 9 It is a schematic structural diagram of an insulating support plate provided in some embodiments;

[0027] Fig.10 is a schematic structural diagram of an insulating support block provided in some embodiments;

[0028] Fig.11 A schematic top view of a converter valve string support structure and a converter valve string provided in some embodiments;

[0029] Fig.12 is a schematic structural diagram of a converter valve provided in some embodiments;

[0030] Fig.13 A three-dimensional schematic diagram of a driving and fixing structure provided in some embodiments;

[0031] Fig.14 It is a structural schematic diagram of a fixed base plate in the driving fixed structure provided in some embodiments;

[0032] Fig.15 It is a schematic structural diagram of another fixed base plate in the driving fixed structure provided in some embodiments;

[0033] Fig.16 It is a structural schematic diagram of another fixed base plate in the driving fixed structure provided in some embodiments;

[0034] Fig.17 A three-dimensional schematic diagram of another driving and fixing structure provided in some embodiments;

[0035] Fig.18 A three-dimensional schematic diagram of another driving and fixing structure provided in some embodiments;

[0036] Fig.19 It is a schematic diagram of the plug-in decomposition of a direct-insert flow control valve and a driving fixed structure provided in some embodiments.

[0037] Description of reference numerals:

[0038] U-converter valve unit, 1-converter valve string, 11-converter valve, 111-thyristor device, 112-integrated gate driver, 12-damping circuit, 121-water-cooled damping resistor, 122-damping capacitor, 13-static voltage balancing circuit, 14-separate lightning arrester, 2-radiator, 3-cooling circuit, 31-main cooling channel, 32-first cooling circuit, 33-second cooling circuit, H1-water inlet, H2-water outlet, 4-bearing frame, 5-saturated reactor, 6-valve string support structure, 61-insulating support plate, 6 11-first mounting hole, 612-lead groove, 62-insulating support block, 621-second mounting hole, 63-head end flange, 64-tail end flange, 7-driving fixing structure, 71-fixed base plate, 711-fixed guide groove, 712-fixing hole, 713-first fixed baffle, 72-insulating cover plate, 721-second fixed baffle, 73-fixing nut, 74-elastic positioning piece, 81-locking structure, 82-pressure equalizing structure, 821-top pressure screw, 822-pressure equalizing pad, 83-elastic anti-loosening structure, 84-through-flow row. DETAILED DESCRIPTION

[0039] In order to facilitate understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thorough and comprehensive.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used in the specification of the present disclosure herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0041] It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below can be represented as a second element, component, region, layer or part.

[0042] It should be understood that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is transmission of electrical signals or data between the connected objects.

[0043] It should be understood that the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, when used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0044] High voltage or ultra-high voltage direct current transmission has the advantages of high voltage level, long transmission distance and large transmission capacity. However, the current high voltage or ultra-high voltage direct current transmission system uses grid-commutated converters based on thyristor devices, which is prone to commutation failure on the inverter side of the converter when the AC line fails, seriously affecting the reliability of high voltage or ultra-high voltage direct current transmission.

[0045] In some embodiments, the reverse-resistance integrated gate commutated thyristor (IGCT) is a new type of power device that combines the advantages of thyristors and insulated-gate bipolar transistors (IGBTs). It not only has the characteristics of large capacity and low loss of thyristors, but also has the ability of active shutdown of IGBTs. The new high-voltage converter based on IGCT actively shuts down under AC faults, can achieve controllable commutation, and essentially solves the problem of commutation failure. However, it can be understood that in the new high-voltage IGCT converter valve group composed of reverse-resistance IGCT devices in series, its pressing force, weight and drive size are quite different from those of the thyristor converter valve group. For example, the pressing force of the same specification IGCT converter valve group is 60% of the pressing force of the thyristor converter valve group, and the weight of the same specification IGCT converter valve group is 1.9 times the weight of the thyristor converter valve group. Therefore, when the IGCT converter valve group is press-fitted in series, the small pressure (small friction) and large deadweight can easily reduce the anti-slip safety factor of the converter valve group by 69%, which has a relatively adverse effect on the structural stability of the IGCT converter valve. In addition, due to the reduced press-fitting force of the IGCT converter valve group, the IGCT converter valve group has a larger thermal resistance than the thyristor converter valve group of the same specification, and the converter valve has a higher working junction temperature.

[0046] In some embodiments, the thyristor converter valve usually inserts the damping resistor of the damping circuit into the inside of the heat sink for cooling, resulting in a large volume and heat dissipation power of a single heat sink. In this way, the thermal resistance of the IGCT converter valve group is larger. If the same arrangement is used, the large-sized heat sink is likely to affect the insulation characteristics and structural stability of the converter valve group.

[0047] Based on this, the embodiment of the present application provides a converter valve group and a DC transmission system, which can reduce the size of the radiator, reduce the weight of the converter valve module, and improve the reliability of the converter valve group, thereby facilitating improving the structural stability of the converter valve group and its insulation characteristics.

[0048] Please combine Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 It is understood that some embodiments of the present disclosure provide a converter valve group, including: a converter valve string 1 and a cooling circuit 3.

[0049] In some embodiments of the present disclosure, the converter valve string 1 includes a multi-stage converter valve unit U connected in series in a first direction (e.g., X direction). The converter valve unit U includes a converter valve module and a damping circuit 12. The converter valve module includes a converter valve 11 and a radiator 2 disposed beside the converter valve 11. The damping circuit 12 is connected in parallel with the converter valve 11, and includes a water-cooled damping resistor 121 and a damping capacitor 122 arranged in a second direction (e.g., Y direction) away from the converter valve 11 and connected in series. The first direction (e.g., X direction) and the second direction (e.g., Y direction) intersect, for example, are orthogonal.

[0050] By way of example, the converter valve 11 includes an IGCT converter valve.

[0051] For example, the water-cooled damping resistors 121 of multiple converter valve units U can be integrated into a damping resistor module.

[0052] For example, the damping capacitors 122 of the plurality of converter valve units U may be integrated into a damping capacitor module. The damping capacitor module may be arranged on a side of the damping resistor module away from each converter valve 11 .

[0053] For example, the damping capacitors 122 of a plurality of converter valve units U may be arranged in a staggered manner to reduce the module area.

[0054] For example, the converter valve unit U further includes a static voltage balancing circuit 13 connected in parallel with the damping circuit 12. The static voltage balancing circuit 13 can be formed by a static voltage balancing piezoresistance, for example.

[0055] For example, one or more converter valve units U may also be interconnected to a separate lightning arrester 14 . Figure 1 In the example, two converter valve units U are grouped together, and the two converter valve units U are connected to a separate lightning arrester 14. In addition, for example, the separate lightning arresters 14 corresponding to the multiple converter valve units U can be integrated into a lightning arrester module. The lightning arrester module can be located between the converter valve 11 and the damping resistor module.

[0056] In some embodiments of the present disclosure, the radiator 2 corresponds to the converter valve 11. The radiator 2 is arranged beside the corresponding converter valve 11 along a first direction (eg, X direction).

[0057] For example, the radiator 2 and the corresponding converter valve 11 are integrated into a converter valve module.

[0058] For example, the converter valve 11 includes an anode. The size of the radiator 2 is not greater than the table size of the anode of the converter valve 11.

[0059] In some embodiments of the present disclosure, the cooling circuit 3 includes: a main cooling channel 31 extending along a first direction (for example, the X direction), a first cooling circuit 32 connecting the main cooling channel 31 and the water-cooled damping resistor 121, and a second cooling circuit 33 connecting the main cooling channel 31 and the radiator 2.

[0060] For example, Figure 5 As shown in , the main cooling channel 31 is located between the converter valve 11 and the water-cooled damping resistor 121 (e.g., a damping resistor module) of each converter valve unit U. The two ends of the main cooling channel 31 in the first direction (e.g., the X direction) are connected to the water inlet H1 and the water outlet H2 respectively. The first cooling circuit 32 connects the main cooling channel 31 and the water-cooled damping resistor 121. The second cooling circuit 33 connects the main cooling channel 31 and the radiator 2.

[0061] Furthermore, optionally, at least two (for example, two) converter valve units U are grouped together, and the first cooling circuit 32 and the second cooling circuit 33 corresponding to the converter valve units in the same group are connected in series. That is, in the same group of converter valve units U, only one first cooling circuit 32 and the second cooling circuit 33 corresponding to the converter valve unit U can be set to connect the main cooling channel 31, and the cooling circuits of the water-cooled damping resistor 121 and the radiator 2 in other converter valve units U are set to be connected in series in sequence. In this way, Figure 5 As shown in the figure, the coolant in the main cooling channel 31 can flow into the water-cooled damping resistor 121 through the first cooling circuit 32, and then flow along the series cooling passage in the same group of converter valve units U, until finally flowing back to the main cooling channel 31 through the second cooling circuit 33 connected to the radiator 2.

[0062] In the disclosed embodiment, a multi-stage converter valve unit U is sequentially connected in series along a first direction (e.g., X direction) to form a converter valve string 1, a radiator 2 is arranged along the first direction (e.g., X direction) beside the corresponding converter valve 11, and a water-cooled damping resistor 121 is arranged along a second direction (e.g., Y direction) away from the converter valve 11. The water-cooled damping resistor 121 and the radiator 2 can be separately arranged, and cooling circuits can be independently arranged for the water-cooled damping resistor 121 and the radiator 2, such as a first cooling circuit 32 connecting the main cooling channel 31 and the water-cooled damping resistor 121, and a second cooling circuit 33 connecting the main cooling channel 31 and the radiator 2. In this way, the embodiment of the present disclosure does not need to insert the damping resistor into the interior of the radiator for cooling, which not only reduces the size of the radiator, but also facilitates the modular integration of the various components, so that the modules can be assembled and the electrical and water connections can be made after integration, thereby reducing the assembly complexity of the converter valve group, and can improve the structural stability and insulation characteristics of the converter valve group, as well as the press-fitting efficiency and overall reliability of the converter valve group.

[0063] In addition, please refer to Figure 2~Figure 5 In some embodiments of the present disclosure, the converter valve group further includes: a supporting frame 4 for supporting the various components and parts of the aforementioned converter valve group.

[0064] In some embodiments of the present disclosure, the converter valve group further includes: a saturable reactor 5 which is arranged at both ends of the converter valve string 1 and connected to the converter valves.

[0065] See also Figure 6 In some embodiments of the present disclosure, the converter valve group further includes: a valve string support structure 6. The valve string support structure 6 can be matched and installed on the aforementioned supporting frame 4.

[0066] See also Figure 7 The valve string support structure 6 includes: an insulating support plate 61 and at least one insulating support block 62. The insulating support plate 61 is located at the upper and lower sides of the converter valve string 1. The insulating support block 62 connects the insulating support plates 61 at the upper and lower sides and is located between adjacent target converter valve units. The insulating support block 62 is used to separate multiple converter valve units U in the converter valve string 1 at equal distances.

[0067] Here, the number of the insulating support blocks 62 can be selected to match the length of the converter valve string 1, for example, one or more.

[0068] In the disclosed embodiment, the insulating support block 62 equidistantly separates the multiple converter valve units in the converter valve string 1, and can separate the entire converter valve string 1 into at least two sub-valve strings, so as to reduce the disturbance of the entire converter valve string 1, thereby reducing the degree of deviation of the center line of each converter valve 11, so as to ensure that each converter valve 11 is evenly stressed. In this way, it is beneficial to improve the vibration resistance of the converter valve group during transportation or operation, reduce the slip risk of the converter valve group (such as displacement failure), and at the same time reduce the discharge risk caused by the change of the insulation gap between the converter valves due to vibration.

[0069] In some examples, the valve string support structure 6 includes an insulating support block 62, and the insulating support block 62 is disposed at a middle position of the converter valve string 1 along a first direction (eg, X direction, ie, the length direction thereof).

[0070] Here, it can be understood that the longitudinal moment is the largest at the middle position of the converter valve string 1 along its length direction during vibration. In the embodiment of the present disclosure, the insulating support block 62 is arranged at the middle position of the converter valve string 1 along its length direction, which can effectively mitigate or eliminate the problem of component displacement failure and discharge caused by electrical gap change in the converter valve group caused by vibration during the transportation and installation of the converter valve group, thereby improving the operating reliability of the converter valve group.

[0071] See also Figure 8 and Fig. 9In some embodiments of the present disclosure, the insulating support plate 61 extends along a first direction (e.g., the X direction, i.e., the serial connection direction of the converter valve units). The valve string segmented support structure further includes: a head end flange 63 and a tail end flange 64 located at both ends of the insulating support plate 61 and connected to the insulating support plates 61 on the upper and lower sides, respectively.

[0072] For example, the insulating support plate 61 is provided with a plurality of first mounting holes 611 for mounting the insulating support block 62 , the head end flange 63 , the tail end flange 64 and the like.

[0073] In some embodiments of the present disclosure, lead grooves 612 are provided on both side edges of the insulating support plate 61 parallel to the first direction (eg, the X direction).

[0074] By way of example, the wire guide groove 612 includes, but is not limited to, a sawtooth groove.

[0075] In the disclosed embodiment, a lead groove 612 is provided on the edge of the insulating support plate 61, and the control optical fiber and the drive line of each converter valve 11 in the converter valve string 1 can be fixed through the lead groove 612 to standardize the wiring of the converter valve group.

[0076] See also Fig.10 In some embodiments of the present disclosure, the insulating support block 62 adopts a plate-like structure, and the upper and lower surfaces of the insulating support block 62 are provided with second mounting holes 621 for matching the corresponding first mounting holes 611 on the insulating support plate 61 for installation and fixation.

[0077] See also Fig.11 In some embodiments of the present disclosure, the converter valve group further includes a locking structure 81. The locking structure 81 is located in the valve string support structure 6 and close to the head end flange 63, and is used to lock and maintain the valve string pressure of the converter valve string 1.

[0078] For example, the locking structure 81 includes but is not limited to a fixing nut. After the converter valve string 1 is pressed to a rated pressure, the valve string pressure of the converter valve string 1 can be locked and maintained by tightening the fixing nut.

[0079] Please continue reading Fig.11 In some embodiments of the present disclosure, the converter valve group further includes a pressure equalizing structure 82. The pressure equalizing structure 82 is located between the locking structure 81 and the converter valve string 1, and is used to conduct and equalize the valve string pressure of the converter valve string 1.

[0080] For example, Fig.11 As shown in the figure, the pressure equalizing structure 82 includes a top pressure screw 821 and a pressure equalizing pad 822; wherein, the pressure equalizing pad 822 contacts the converter valve string 1, and is used to balance the pressing force of the converter valve string 1; the top pressure screw 821 connects the pressure equalizing pad 822 and the locking structure 81, and is used to transmit the pressing force to the pressure equalizing pad 822.

[0081] Please continue reading Fig.11 In some embodiments of the present disclosure, the converter valve group further includes an elastic anti-loosening structure 83. The elastic anti-loosening structure 83 is located in the valve string support structure 6 and between the converter valve string 1 and the tail end flange 64, and is used to pre-tighten and limit the converter valve string 1.

[0082] For example, the elastic anti-loosening structure 83 includes but is not limited to an assembly consisting of a guide rod connected in series with a plurality of elastic gaskets.

[0083] Please continue reading Fig.11 In some embodiments of the present disclosure, the converter valve group further includes a flow bar 84. The flow bar 84 is connected to the converter valve 11 and can be used to conduct a large current.

[0084] See also Fig.12 In some embodiments of the present disclosure, the converter valve 11 includes a thyristor device 111 and an integrated gate driver 112 connected to the thyristor device 111 .

[0085] Please combine Figure 6 , Fig.12 and Fig.13 It is understood that the converter valve group further includes a drive fixing structure 7. The drive fixing structure 7 is flexibly connected to the supporting frame 4, and includes a shielding box accommodating area corresponding to each converter valve 11; wherein the integrated gate driver 112 is installed in the shielding box accommodating area.

[0086] Here, the flexible connection between the driving fixed structure 7 and the supporting frame 4 means that the connection between the driving fixed structure 7 and the supporting frame 4 is elastic in at least two directions so as to reserve movable space, thereby offsetting vibration stress.

[0087] For example, the driving fixing structure 7 is elastically connected to the supporting frame 4 through an elastic element (such as an elastic damping sheet) along the vertical direction, and the driving fixing structure 7 is installed and fixed through a long strip fixing hole with a redundant amount along the left and right direction (such as the first direction, the X direction). Fig.18 The driving fixing structure 7 can be fixedly connected to the supporting frame 4 after being installed in the long strip fixing hole by the fixing nut 73 carrying the elastic shock absorbing sheet.

[0088] In the disclosed embodiment, the integrated gate driver 112 of the converter valve 11 can be fixed to the shielding box accommodating area by driving the fixing structure 7, so as to improve the vibration resistance of the large-sized converter valve 11 during transportation or operation, and can further reduce the discharge risk caused by the change of the insulation gap between the converter valves 11 due to vibration, thereby further improving the structural stability and operational reliability of the converter valve group.

[0089] For example, see Fig.13The driving fixed structure 7 includes a fixed bottom plate 71 and an insulating cover plate 72 disposed on the fixed bottom plate 71. The insulating cover plate 72 and the fixed bottom plate 71 are connected to form a frame shape to form a receiving area for the converter valve string 11.

[0090] For example, the fixed bottom plate 71 may be provided with a fixed guide groove, a fixed hole or a fixed baffle to separate and define the aforementioned shielding box accommodating area.

[0091] In some examples, such as Fig.14 As shown in FIG. 1 , a fixed guide groove 711 is provided on the fixed bottom plate 71 , and the inner area of ​​the fixed guide groove 711 constitutes a shielding box accommodating area.

[0092] In some examples, such as Fig.15 As shown in FIG. 7 , a fixing hole 712 is provided on the fixing base plate 71. The integrated gate driver 112 of the converter valve 11 can be fixed in the fixing hole 712 by screws.

[0093] In some examples, such as Fig.16 As shown in FIG. 1 , a first fixed baffle plate 713 having a plurality of spaced creepage grooves may be provided on the fixed bottom plate 71. The area between adjacent first fixed baffle plates 713 constitutes a shielding box accommodating area.

[0094] Optionally, see Fig.17 The insulating cover plate 72 is provided with a second fixed baffle 721 matching the first fixed baffle 713 on the fixed bottom plate 71 .

[0095] See also Fig.18 In some embodiments of the present disclosure, the integrated gate driver 112 is provided with a positioning groove. The driving fixing structure 7 also includes an elastic positioning member 74 that matches the positioning groove and is used to engage with the positioning groove.

[0096] For example, the positioning groove of the integrated gate driver 112 is a spherical groove. The elastic positioning member 74 in the drive fixing structure 7 is a spherical elastic positioner. The connection between the converter valve 11 and the drive fixing structure 7 can be achieved by the engagement of the positioning groove and the elastic positioning member 74.

[0097] In addition, it is worth mentioning that Fig.19 In some embodiments, the connection between the converter valve string 1 and the drive fixing structure 7 is a plug-in connection. When repairing and replacing the integrated gate driver 112 of the converter valve 11, there is no need to disassemble the entire converter valve string 1. Only the fixing screws between the thyristor device 111 and the integrated gate driver 112 in the faulty converter valve 11 can be removed, and then the integrated gate driver 112 can be pulled out from the frame side of the drive fixing structure 7, so that the integrated gate driver 112 can be quickly replaced, thereby effectively improving the convenience of installation and maintenance of the converter valve group components.

[0098] Some embodiments of the present disclosure also provide a direct current power transmission system, comprising the converter valve group described in any of the above embodiments. The direct current power transmission system also possesses the technical advantages of the converter valve group described above.

[0099] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0100] The above-described embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be subject to the attached claims.

Claims

1. A converter valve group, characterized in that: include: A converter valve string comprises a plurality of converter valve units connected in series in a first direction; the converter valve units comprise: A converter valve module, comprising a converter valve and a radiator arranged beside the converter valve; a damping circuit connected in parallel with the converter valve, comprising a water-cooled damping resistor and a damping capacitor arranged and connected in series along a second direction away from the converter valve; the second direction intersects the first direction; A cooling circuit, comprising: a main cooling channel extending along the first direction, a first cooling circuit connecting the main cooling channel and the water-cooled damping resistor, and a second cooling circuit connecting the main cooling channel and the radiator; Wherein, the converter valve group further includes: a valve string support structure; the valve string support structure includes: Insulating support plates, located at the upper and lower sides of the converter valve string; An insulating support block, connecting the insulating support plates at the upper and lower sides and arranged at a middle position of the converter valve string along the first direction; A head end flange and a tail end flange are located at both ends of the insulating support plate and are connected to the insulating support plates at the upper and lower sides respectively; Wherein, the commutation valve comprises a thyristor device and an integrated gate driver connected to the thyristor device; the thyristor device comprises an integrated gate commutation thyristor; the commutation valve group further comprises: A bearing frame, used for bearing the converter valve string and the valve string supporting structure; The drive fixing structure is flexibly connected to the bearing frame and includes a shielding box accommodating area corresponding to each of the converter valves; the integrated gate driver is installed in the shielding box accommodating area; the converter valve string and the drive fixing structure are connected in a direct plug-in manner.

2. The converter valve group according to claim 1, characterized in that: The main cooling channel is located between the converter valve of each converter valve unit and the water-cooled damping resistor; At least two of the converter valve units form a group, and the first cooling circuit and the second cooling circuit corresponding to the converter valve units in the same group are connected in series.

3. The converter valve group according to claim 1, characterized in that: The converter valve includes an anode; the size of the radiator is not greater than the table size of the anode.

4. The converter valve group according to claim 1, characterized in that: The insulating support plate extends along the first direction; and lead grooves are provided on both side edges of the insulating support plate parallel to the first direction.

5. The converter valve group according to claim 4, characterized in that: The lead groove includes a sawtooth groove.

6. The converter valve group according to claim 1, characterized in that: Also includes: A locking structure, located in the valve string support structure and close to the head end flange, used to lock and maintain the valve string pressure of the converter valve string; A pressure equalizing structure, located between the locking structure and the converter valve string, and used for conducting and equalizing the valve string pressure of the converter valve string; The elastic anti-loosening structure is located in the valve string supporting structure and between the converter valve string and the tail end flange, and is used for pre-tightening and limiting the converter valve string.

7. The converter valve group according to claim 6, characterized in that: The pressure-equalizing structure includes a pressure-equalizing screw and a pressure-equalizing pad; wherein the pressure-equalizing pad contacts the converter valve string to balance the pressing force of the converter valve string; the pressure-equalizing screw connects the pressure-equalizing pad and the locking structure to transmit the pressing force to the pressure-equalizing pad.

8. The converter valve group according to claim 6, characterized in that: The locking structure includes a fixing nut; The elastic anti-loosening structure comprises an assembly formed by connecting a plurality of elastic gaskets in series with a guide rod.

9. The converter valve group according to claim 1, characterized in that: The integrated gate driver is provided with a positioning groove; The driving and fixing structure also includes an elastic positioning member that matches the positioning groove and is used to engage with the positioning groove.

10. A direct current power transmission system, comprising a converter valve group as claimed in any one of claims 1 to 9.

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