CN112134476A - Lightning arrester valve tower, converter valve tower and converter device - Google Patents

Lightning arrester valve tower, converter valve tower and converter device Download PDF

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Publication number
CN112134476A
CN112134476A CN201910548760.9A CN201910548760A CN112134476A CN 112134476 A CN112134476 A CN 112134476A CN 201910548760 A CN201910548760 A CN 201910548760A CN 112134476 A CN112134476 A CN 112134476A
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CN
China
Prior art keywords
layer
valve tower
busbar assembly
power module
lightning arrester
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Granted
Application number
CN201910548760.9A
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Chinese (zh)
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CN112134476B (en
Inventor
杨有涛
杨志千
耿杰
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Priority to CN201910548760.9A priority Critical patent/CN112134476B/en
Publication of CN112134476A publication Critical patent/CN112134476A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The invention discloses a lightning arrester valve tower, a converter valve tower and a converter device. This arrester valve tower includes: the three-layer lightning arrester module and the three groups of insulators are arranged on the three-layer lightning arrester module; each layer of lightning arrester module comprises a plurality of lightning arresters, a first busbar assembly and a second busbar assembly, wherein the plurality of lightning arresters are arranged between the first busbar assembly and the second busbar assembly in parallel; a second busbar assembly of the first layer of lightning arrester module is supported by the first group of insulators; a second busbar assembly of the second layer of lightning arrester module is supported by a second group of insulators; a second busbar assembly of the third layer of the lightning arrester module is supported by a third group of insulators; the heights of the first group of insulators, the second group of insulators and the third group of insulators are sequentially increased, and the preset creepage requirement is met. By adopting the embodiment of the invention, a modularized lightning arrester structure easy to install can be provided on the premise of not changing the existing converter valve structure, and the converter valve tower integrated with the lightning arrester function is obtained.

Description

Lightning arrester valve tower, converter valve tower and converter device
Technical Field
The invention relates to the technical field of wind power generation, in particular to a lightning arrester valve tower, a converter valve tower and a converter device.
Background
The function of a converter valve is to perform a conversion operation on the current, such as converting alternating current to direct current or converting direct current to alternating current. A Modular Multi-level Control (MMC) is a novel voltage change circuit, and a high voltage can be output in a superposition manner by cascading a plurality of sub-modules to form a bridge arm. In order to suppress the voltage spike and energy of the bridge arm under the operating overvoltage and lightning overvoltage conditions, a lightning arrester needs to be installed on the bridge arm to protect the safety of the bridge arm of the converter valve. The converter valve tower in the prior art does not integrate the arrester function, and how to provide the modularized arrester structure easy to install becomes the problem that needs to be solved urgently on the premise of not changing the existing converter valve structure.
Disclosure of Invention
The embodiment of the invention provides a lightning arrester valve tower, a converter valve tower and a converter device, which can provide a modularized lightning arrester structure easy to install on the premise of not changing the existing converter valve structure, so that the converter valve tower integrated with the lightning arrester function is obtained.
In a first aspect, an embodiment of the present invention provides an arrester valve tower, including: the three-layer lightning arrester module and the three groups of insulators are arranged on the three-layer lightning arrester module; each layer of lightning arrester module comprises a plurality of lightning arresters, a first busbar assembly and a second busbar assembly, wherein the plurality of lightning arresters are arranged between the first busbar assembly and the second busbar assembly in parallel; a second busbar assembly of the first layer of lightning arrester module is supported by the first group of insulators; a second busbar assembly of the second layer of lightning arrester module is supported by a second group of insulators; a second busbar assembly of the third layer of the lightning arrester module is supported by a third group of insulators; the heights of the first group of insulators, the second group of insulators and the third group of insulators are sequentially increased, and the preset creepage requirement is met.
In one possible implementation manner of the first aspect, the lightning arrester includes a body, and a first interface fitting and a second interface fitting located at two ends of the body; the first busbar assembly comprises at least one first row of busbars, the at least one first row of busbars are arranged in parallel, short edges of the first row of busbars are aligned, a plurality of groups of first mounting holes are formed in the first row of busbars at intervals along the length direction of the first row of busbars, and first interface hardware fittings of a plurality of arresters in each layer of arrester module are connected with the first row of busbars through the corresponding first mounting holes; the second busbar assembly comprises at least one second row busbar, the at least one second row busbar and the plurality of first row busbars are arranged in a one-to-one correspondence mode, a plurality of groups of second mounting holes are formed in the first row busbars at intervals along the length direction of the first row busbars, the plurality of groups of second mounting holes are aligned with the plurality of groups of first mounting holes one by one, and second interface hardware fittings of a plurality of arresters in each layer of arrester module are connected with the second row busbars through the corresponding second mounting holes.
In a possible implementation manner of the first aspect, the first busbar assembly further includes a first column busbar, and one short-side end of each of the plurality of first row busbars is fixed to the first column busbar; the second busbar assembly comprises two second-row busbars, one short side end of each of the second-row busbars is fixed to one of the two second-row busbars, and the other short side end of each of the second-row busbars is fixed to the other of the two second-row busbars.
In a possible implementation manner of the first aspect, the first busbar assembly is located above the second busbar assembly, the first busbar assembly is of a plate-shaped structure, and the second busbar assembly is of an i-shaped structure.
In a possible embodiment of the first aspect, the number of lightning arresters in each layer of lightning arrester modules, etc.; the number of arresters is determined by the level and/or energy of the operating overvoltage between the valve ends.
In a second aspect, an embodiment of the present invention provides a converter valve tower, including: a power module valve tower and a lightning arrester valve tower as described above; the power module valve tower comprises three layers of power modules, wherein each layer of power module consists of a plurality of valve section strings which are arranged in a cascade mode, a first valve section string of a first layer of power module, a first valve section string of a second layer of power module and a first valve section string of a third layer of power module are sequentially connected and serve as a direct-current public port of the power module valve tower, and a last valve section string of the first layer of power module, a last valve section string of the second layer of power module and a last valve section string of the third layer of power module are respectively used as single-phase output ports alternating current of the power module valve tower; the first valve section string in each layer of power module is connected with one of the first busbar assembly and the second busbar assembly of the lightning arrester module on the corresponding layer; and the last valve section string in each layer of power module is connected with the other of the first busbar assembly and the second busbar assembly of the lightning arrester module on the corresponding layer.
In a possible implementation manner of the second aspect, each layer of power module further includes a live-line frame, and the live-line frames are respectively connected with the plurality of valve section strings in the layer of power module; the second busbar assembly of each layer of lightning arrester module is connected with the electrified framework of the first valve section string in the power module of the corresponding layer through the steel-cored aluminum strand; and the first busbar assembly of each layer of lightning arrester module is connected with the electrified framework of the last valve section string in the corresponding layer of power module through the steel-cored aluminum stranded wire.
In one possible embodiment of the second aspect, the first set of insulators, the second set of insulators, and the third set of insulators are spaced apart along a direction parallel to a length of the power module valve tower.
In one possible embodiment of the second aspect, the lightning arrester valve tower and the power module valve tower share a bottom mounting channel, and a projection of the lightning arrester valve tower in a width direction of the power module valve tower covers a part or all of the power module valve tower.
In a third aspect, an embodiment of the present invention provides a converter device, where the converter device includes an upper bridge arm converter valve tower and a lower bridge arm converter valve tower, where the upper bridge arm converter valve tower and the lower bridge arm converter valve tower both have the converter valve tower structures as described above; the direct-current common port of the upper bridge arm converter valve tower is connected with the direct-current positive output end of the generator set, the direct-current common port of the lower bridge arm converter valve tower is connected with the direct-current negative output end of the generator set, and the single-phase alternating-current output ports of the upper bridge arm converter valve tower are respectively connected with the corresponding single-phase alternating-current output ports of the lower bridge arm converter valve tower through bridge arm inductors.
As described above, the arrester valve tower in the embodiment of the invention is in a modular design, and when the arrester valve tower is used, each layer of arrester module can be installed independently, so that the converter valve tower integrated with the arrester function can be obtained on the premise of not changing the structure of the existing converter valve, and the arrester valve tower is simple in structure and easy to popularize and use.
Drawings
The present invention may be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters identify like or similar features.
Fig. 1 is a schematic structural diagram of a valve tower of a lightning arrester according to an embodiment of the present invention;
fig. 2 is a schematic view of a supporting structure of a first-layer lightning arrester module according to an embodiment of the present invention;
fig. 3 is a schematic view of a supporting structure of a second layer or a third layer of lightning arrester module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a lightning arrester according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a second busbar assembly according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a converter valve tower according to an embodiment of the present invention;
fig. 7 is a second schematic structural diagram of a converter valve tower according to an embodiment of the present invention;
fig. 8 is a third schematic structural diagram of a converter valve tower according to an embodiment of the present invention;
FIG. 9 is one of schematic electrical connections of a valve tower for a converter valve provided in accordance with an embodiment of the present invention;
fig. 10 is a second schematic diagram of electrical connections of a valve tower of a converter valve according to an embodiment of the invention;
FIG. 11 is a schematic diagram of the electrical connections of a valve segment string provided by an embodiment of the present invention;
fig. 12 is a third schematic diagram of electrical connections of a valve tower of a converter valve according to an embodiment of the invention;
fig. 13 is a fourth schematic diagram of electrical connections of a valve tower of a converter valve according to an embodiment of the invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention.
The embodiment of the invention provides a lightning arrester valve tower, a converter valve tower and a converter device, which can provide a modularized lightning arrester structure easy to install on the premise of not changing the existing converter valve structure, so that the converter valve tower integrated with the lightning arrester function is obtained. Therefore, under the conditions of operation overvoltage and lightning overvoltage, the voltage spike and energy of the bridge arm can be inhibited to protect the safety of the bridge arm of the converter valve, so that the safety requirement of the converter valve of the flexible-direct wind generating set, such as a Modular Multi-level Control (MMC), is met.
The structure of the valve tower of the arrester according to the embodiment of the present invention will be described with reference to fig. 1 to 5.
Referring to fig. 1, a surge arrester valve tower 100 includes: three-layer arrester module and three group insulators.
Each layer of lightning arrester module comprises a plurality of lightning arresters 1011, a first busbar assembly 1012 and a second busbar assembly 1013, wherein the plurality of lightning arresters 1011 are arranged between the first busbar assembly 1012 and the second busbar assembly 1013 in parallel.
The second busbar assembly 1013 of the first layer of arrester modules is supported by the first set of insulators.
The second busbar assembly 1013 of the second layer of arrester modules is supported by a second set of insulators.
The second busbar assembly 1013 of the third layer of surge arrester modules is supported by the third group of insulators.
The heights of the first group of insulators, the second group of insulators and the third group of insulators are sequentially increased, and the preset creepage requirement is met.
Referring to fig. 2, in order to meet the requirement of creepage, a ceramic insulator may be used to support the first layer of lightning arrester module, considering the problem of the height of the first layer of lightning arrester module.
Referring to fig. 3, in consideration of the fact that the second layer of arrester module and the third layer of arrester module highly satisfy the requirement of creepage, the second layer of arrester module and the third layer of arrester module can be supported by the glass fiber reinforced plastic insulating support, thereby saving the system cost.
Referring to fig. 4, the arrester 1011 includes a body 10111 and a first interface fitting 10112 and a second interface fitting 10113 located at both ends of the body. In one example, the first interface fitting 10112 and the second interface fitting 10113 have a certain number of bolt holes thereon, so as to facilitate reliable connection with an external device.
With continued reference to fig. 2 and 3, the first busbar assembly 1012 includes at least one first row of busbars 1021, the at least one first row of busbars 1021 is arranged in parallel and has aligned short sides, a plurality of groups of first mounting holes 1022 are arranged at intervals along the length direction of the first row of busbars 1021, and the first interface fittings 10112 of the plurality of arresters in each layer of arrester module are connected with the first row of busbars 1021 through the corresponding first mounting holes 1022.
In some embodiments, the plurality of groups of first mounting holes 1022 are distributed at equal intervals along the length direction of the first busbar assembly 1012, so that a plurality of parallel arresters in the same layer of arrester module are arranged in parallel at equal intervals, thereby saving space and improving the stability of the lightning arresting effect of the arrester module.
In some embodiments, the first busbar assembly 1012 further includes a first row busbar 1023, and one short edge end of the first row busbar 1021 is fixed to the first row busbar 1023 to improve the structural stability of the parallel lightning arrester module.
Referring to fig. 5, the second busbar assembly 1013 includes at least one second row busbar 1024, the at least one second row busbar 1024 is arranged corresponding to the plurality of first row busbars 1021, the first row busbars 1021 are provided with a plurality of groups of second mounting holes 1025 at intervals along the length direction thereof, the plurality of groups of second mounting holes 1025 are aligned with the plurality of groups of first mounting holes 1022, and the second interface fittings 10113 of the plurality of arresters in each layer of arrester module are connected with the second row busbar 1024 through the corresponding second mounting holes 1025.
In some embodiments, the second busbar assembly 1013 includes two second rows of busbars 1026, one short side end of each of the second rows of busbars 1024 is fixed to one of the two second rows of busbars 1026, and the other short side end of each of the second rows of busbars 1024 is fixed to the other of the two second rows of busbars 1026, so as to improve the structural stability of the shunt lightning arrester module.
The first busbar assembly 1012 is located above the second busbar assembly 1013, the first busbar assembly 1012 may have a plate-shaped structure, and the second busbar assembly 1013 may have an i-shaped structure, such as an i-shaped aluminum alloy beam, so as to provide a supporting function for each layer of arrester module.
In some embodiments, the number of arresters in each tier of arrester modules is equal. In the solution of fig. 7, 21 arresters are exemplarily shown connected in parallel, it being understood that the number of arresters is determined by the level and/or the energy of the operating overvoltage between the valve terminals, without being limited thereto.
As described above, the arrester valve tower in the embodiment of the invention is in a modular design, and when the arrester valve tower is used, each layer of arrester module can be installed independently, so that the converter valve tower integrated with the arrester function can be obtained on the premise of not changing the structure of the existing converter valve, and the arrester valve tower is simple in structure and easy to popularize and use.
The embodiment of the invention also provides a converter valve tower.
Referring to fig. 6, the converter valve tower comprises: a power module valve tower 200 and a lightning arrester valve tower 100 as described above. Wherein the power module valve tower 200 includes three layers of power modules. The three layers of power modules are sequentially arranged from low to high, each layer of power module is composed of a plurality of valve section strings 201 which are arranged in a cascade mode, and the valve section strings 201 can be understood as being formed by cascading a plurality of SM power units.
In specific implementation, each layer of power module further includes an electrified framework 202, and the electrified framework 202 is connected to the plurality of valve sections in the layer of power module in series.
In some embodiments, multiple valve section strings in each tier of power modules are connected by a live frame 202. The charged frame 202 may be an aluminum alloy material or a steel material. Because the aluminum alloy material has the advantages of low density, high strength, good plasticity, good electrical conductivity, good thermal conductivity and good corrosion resistance, and can be processed into various sections, the embodiment of the invention preferably adopts the aluminum alloy electrified framework.
In the converter valve tower structure provided by the embodiment of the invention, the first layer of lightning arrester module is connected with the first layer of power module, the second layer of lightning arrester module is connected with the second layer of power module, and the third layer of lightning arrester module is connected with the third layer of power module. The connection relationship and the positional relationship between the power module valve tower 200 and the arrester valve tower 100 according to the embodiment of the present invention will be described with reference to fig. 7 and 8.
Referring to fig. 7, on the dc side, the first valve section string of the first layer power module, the first valve section string of the second layer power module, and the first valve section string of the third layer power module are connected in sequence to serve as a dc common port of the power module valve tower 200.
And the first valve section string in each layer of power module is connected with one of the first busbar assembly 1012 and the second busbar assembly 1013 of the arrester module of the corresponding layer. In specific implementation, the second busbar assembly 1013 of the first layer of lightning arrester module is connected to the live-wire frame of the first valve section string in the power module of the first layer through the steel-reinforced aluminum stranded wire 301. The second busbar assembly 1013 of the second layer lightning arrester module is connected to the live frame of the first valve section string in the power module of the second layer by the steel-reinforced aluminum stranded wire 302. The second busbar assembly 1013 of the lightning arrester module of the third layer is connected with the live-wire frame of the first valve section string in the power module of the third layer through the steel-reinforced aluminum stranded wire 303.
Referring to fig. 8, on the ac side, the last (i.e., nth) valve section string of the first layer power module, the last (i.e., nth) valve section string of the second layer power module, and the last (i.e., nth) valve section string of the third layer power module are respectively used as single-phase ac output ports of the power module valve tower 200.
And, the last valve section string in each layer of power module is connected with the other of the first busbar assembly 1012 and the second busbar assembly 1013 of the arrester module of the corresponding layer. In specific implementation, the first busbar assembly 1012 of the first layer of lightning arrester module is connected with the live-wire frame of the nth valve segment string in the power module of the first layer through the steel-cored aluminum strand 304, and serves as an a-phase output port. The first busbar assembly 1012 of the second layer lightning arrester module is connected with the live frame of the nth valve segment string in the power module of the second layer through the steel-cored aluminum strand 305, and serves as a B-phase output port. The first busbar assembly 1012 of the third layer lightning arrester module is connected with the live-wire frame of the nth valve segment string in the power module of the third layer through the steel-cored aluminum stranded wire 306, and serves as a C-phase output port.
In some embodiments, as shown in fig. 7 and 8, the surge arrester valve tower 100 and the power module valve tower 200 share a bottom mounting channel 307 to improve the robustness of the converter valve tower.
Further, in order to save space and improve the structural compactness of the converter valve tower, the lightning arrester valve tower 100 and the power module valve tower 200 in the converter valve tower are arranged in parallel. The first, second, and third sets of insulators are distributed at intervals in a direction parallel to the length direction of the power module valve tower 200, and a projection of the lightning arrester valve tower 100 in the width direction of the power module valve tower 200 covers a part or all of the power module valve tower 200.
As described above, the converter valve tower in the embodiment of the present invention integrates the power module valve tower 200 and the lightning arrester valve tower 100, so that the converter valve tower integrates the lightning arrester function, which can suppress the voltage spike and energy of the bridge arm under the operation overvoltage and lightning overvoltage states to protect the safety of the bridge arm of the converter valve, and meet the safety requirement of the MMC converter valve of the flexible-direct wind turbine generator system.
The converter valve tower in the embodiment of the invention is characterized in that a power module valve tower 200 and a lightning arrester valve tower 100 are pertinently connected through structural innovation, the problem that the converter valve tower cannot be designed in an integrated mode due to the fact that bridge arm lightning arresters need to be installed in the current market is solved, the reliability of a converter valve is improved, and components of the converter valve are protected from being damaged by lightning.
The embodiment of the invention also provides a converter device, which comprises an upper bridge arm converter valve tower and a lower bridge arm converter valve tower, wherein the specific structures of the upper bridge arm converter valve tower and the lower bridge arm converter valve tower are referred to the converter valve tower 600.
The direct-current common port of the upper bridge arm converter valve tower is connected with a direct-current positive (DC +) output end of the generator set, the direct-current common port of the lower bridge arm converter valve tower is connected with a direct-current negative (DC-) output end of the generator set, and the single-phase alternating-current output port of the upper bridge arm converter valve tower is respectively connected with the A, B, C three-phase alternating-current output port of the corresponding phase of the lower bridge arm converter valve tower through bridge arm inductors.
To facilitate understanding of those skilled in the art, the electrical connection relationship of the flow switching device will be described below with reference to fig. 9 to 13.
Referring to fig. 9, under normal conditions, direct current generated by the direct current fan array is transmitted to the converter valve tower through the direct current transmission line (DC + and DC-), and is inverted and boosted by the converter valve tower and then is merged into a three-phase alternating current power grid.
In the example of fig. 9, 11 is an a-phase upper arm cell, 12 is a B-phase upper arm cell, 13 is a C-phase upper arm cell, 14 is an a-phase lower arm cell, 15 is a B-phase lower arm cell, and 16 is a C-phase lower arm cell. In order to suppress the voltage spike and energy of the bridge arm under the operating overvoltage and lightning overvoltage states, a lightning arrester needs to be installed on the bridge arm to protect the safety of the bridge arm of the converter valve.
Referring to fig. 10, a combination implementation form of the phase a upper arm unit 11, the phase B upper arm unit 12, and the phase C upper arm unit 13 is specifically an upper arm converter valve tower 600. The combined implementation form of the a-phase lower bridge arm unit 14, the B-phase lower bridge arm unit 15 and the C-phase lower bridge arm unit 16 is specifically a lower bridge arm converter valve tower 600.
The a-phase upper arm unit 11 includes an a-phase upper arm valve segment string 111 and an a-phase upper arm parallel arrester 112.
The B-phase upper arm unit 12 includes a B-phase upper arm valve segment string 121 and a B-phase upper arm parallel arrester 122.
The C-phase upper arm unit 13 includes a C-phase upper arm valve segment string 131 and a C-phase upper arm parallel arrester 132.
The a-phase lower arm unit 14 includes an a-phase lower arm valve segment string 141 and an a-phase lower arm parallel arrester 142.
The B-phase lower arm unit 15 includes a B-phase lower arm valve segment string 151 and a B-phase lower arm parallel arrester 152.
The C-phase lower arm unit 16 includes a C-phase lower arm valve segment string 161 and a C-phase lower arm parallel arrester 162.
Referring to fig. 11, each valve segment string is formed by M SM power units in a cascade connection, the second electrical interface of the 1 st SM power unit is connected to the first electrical interface of the 2 nd SM power unit, the second electrical interface of the 2 nd SM power unit is connected to the first electrical interface of the 3 rd SM power unit, … …, and so on, the second electrical interface of the (M-1) th SM power unit is connected to the first electrical interface of the mth SM power unit, wherein the cascade number M of SM power units is determined by the installation structure of the valve segment, the mechanical endurance of the insulating support, and the insulating fit relationship.
Referring to fig. 12, the a-phase upper bridge arm valve segment string 111, the B-phase upper bridge arm valve segment string 121, and the C-phase upper bridge arm valve segment string 131 correspond to a three-layer power valve tower structure of an upper bridge arm converter valve tower, and the a-phase lower bridge arm valve segment string 141, the B-phase lower bridge arm valve segment string 151, and the C-phase lower bridge arm valve segment string 161 correspond to a three-layer power valve tower structure of a lower bridge arm converter valve tower.
One end of the first valve section string of the A-phase upper bridge arm valve section string 111, the B-phase upper bridge arm valve section string 121 and the C-phase upper bridge arm valve section string 131 forms a direct current common port of the upper bridge arm converter valve tower and is connected with a direct current positive (DC +) output end of the generator set. One end of the Nth valve section string of the A-phase lower bridge arm valve section string 141, the B-phase lower bridge arm valve section string 151 and the C-phase lower bridge arm valve section string 161 forms a direct current common port of a lower bridge arm converter valve tower and is connected with a direct current positive (DC-) output end of the generator set.
One end of the Nth valve section string of the A-phase upper bridge arm valve section string 111, the B-phase upper bridge arm valve section string 121 and the C-phase upper bridge arm valve section string 131 is respectively used as a single-phase alternating current output port of the upper bridge arm converter valve tower. One end of the 1 st valve segment string of the A-phase lower bridge arm valve segment string 141, the B-phase lower bridge arm valve segment string 151 and the C-phase lower bridge arm valve segment string 161 is respectively used as a single-phase alternating current output port of the lower bridge arm converter valve tower. And the single-phase alternating current output port of the upper bridge arm converter valve tower is connected with the single-phase alternating current output port of the lower bridge arm converter valve tower of the corresponding phase.
Referring to fig. 13, the phase a upper arm parallel arrester 112, the phase B upper arm parallel arrester 122, and the phase C upper arm parallel arrester 132 correspond to a three-layer arrester valve tower structure of the upper arm converter valve tower, and the phase a lower arm parallel arrester 142, the phase B lower arm parallel arrester 152, and the phase C lower arm parallel arrester 162 correspond to a three-layer arrester valve tower structure of the lower arm converter valve tower.
It should be understood that the embodiments in the present specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment is described with emphasis on the points of the other embodiments. For the device embodiments, reference may be made to the description of the method embodiments in the relevant part. Embodiments of the invention are not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions to, or change the order between the steps, after appreciating the spirit of the embodiments of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of an embodiment of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
Embodiments of the present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the embodiments of the present invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

1. A valve tower of an arrester is characterized by comprising three layers of arrester modules and three groups of insulators; wherein the content of the first and second substances,
each layer of lightning arrester module comprises a plurality of lightning arresters, a first busbar assembly and a second busbar assembly, wherein the plurality of lightning arresters are arranged between the first busbar assembly and the second busbar assembly in parallel;
a second busbar assembly of the first layer of lightning arrester module is supported by the first group of insulators;
a second busbar assembly of the second layer of lightning arrester module is supported by a second group of insulators;
a second busbar assembly of the third layer of the lightning arrester module is supported by a third group of insulators;
the heights of the first group of insulators, the second group of insulators and the third group of insulators are sequentially increased, and the preset creepage requirement is met.
2. A lightning arrester valve tower according to claim 1,
the lightning arrester comprises a body, a first interface hardware fitting and a second interface hardware fitting, wherein the first interface hardware fitting and the second interface hardware fitting are positioned at two ends of the body;
the first busbar assembly comprises at least one first row of busbars, the at least one first row of busbars are arranged in parallel, short edges of the first row of busbars are aligned, a plurality of groups of first mounting holes are formed in the first row of busbars at intervals along the length direction of the first row of busbars, and first interface hardware fittings of a plurality of lightning arresters in each layer of lightning arrester module are connected with the first row of busbars through the corresponding first mounting holes;
the second busbar assembly comprises at least one second row busbar and a plurality of first row busbars, wherein the first row busbars are provided with a plurality of groups of second mounting holes at intervals along the length direction of the first row busbars, the second mounting holes are aligned with the first mounting holes one by one, and second interface hardware fittings of a plurality of arresters in each layer of arrester module are connected with the second row busbars through corresponding second mounting holes.
3. A lightning arrester valve tower according to claim 2,
the first busbar assembly further comprises a first column busbar, and one short end of each of the first row busbars is fixed to the first column busbar;
the second busbar assembly comprises two second-row busbars, one short-edge end of each of the second-row busbars is fixed to one of the two second-row busbars, and the other short-edge end of each of the second-row busbars is fixed to the other of the two second-row busbars.
4. A lightning arrester valve tower according to claim 2,
the first busbar assembly is located above the second busbar assembly, the first busbar assembly is of a plate-shaped structure, and the second busbar assembly is of an I-shaped structure.
5. A lightning arrester valve tower according to claim 1,
the number of lightning arresters in each layer of lightning arrester module is equal;
the number of said arresters is determined by the level and/or the energy of the operating overvoltage between the valve ends.
6. A converter valve tower, comprising: a power module valve tower and a lightning arrester valve tower according to any one of claims 1-7; wherein the content of the first and second substances,
the power module valve tower comprises three layers of power modules, each layer of power module is composed of a plurality of valve section strings which are arranged in a cascade mode, wherein a first valve section string of a first layer of power module, a first valve section string of a second layer of power module and a first valve section string of a third layer of power module are sequentially connected and serve as a direct-current common port of the power module valve tower, and a last valve section string of the first layer of power module, a last valve section string of the second layer of power module and a last valve section string of the third layer of power module are respectively used as single-phase alternating-current output ports of the power module valve tower;
the first valve section string in each layer of power module is connected with one of the first busbar assembly and the second busbar assembly of the lightning arrester module on the corresponding layer;
and the last valve section string in each layer of power module is connected with the other of the first busbar assembly and the second busbar assembly of the lightning arrester module on the corresponding layer.
7. The converter valve tower of claim 6,
each layer of power module further comprises an electrified framework, and the electrified framework is connected with the plurality of valve sections in the layer of power module in series respectively;
the second busbar assembly of each layer of lightning arrester module is connected with the electrified framework of the first valve section string in the power module of the corresponding layer through the steel-cored aluminum strand;
and the first busbar assembly of each layer of lightning arrester module is connected with the electrified framework of the last valve section string in the corresponding layer of power module through the steel-cored aluminum stranded wire.
8. The converter valve tower of claim 6,
the first group of insulators, the second group of insulators and the third group of insulators are distributed at intervals along the length direction parallel to the power module valve tower.
9. The converter valve tower of claim 6, wherein the surge arrester valve tower and the power module valve tower share a bottom mounting channel, and a projection of the surge arrester valve tower in a width direction of the power module valve tower covers part or all of the power module valve tower.
10. A converter device, comprising an upper bridge arm converter valve tower and a lower bridge arm converter valve tower, both having a converter valve tower structure according to any one of claims 1-9;
the direct-current common port of the upper bridge arm converter valve tower is connected with the direct-current positive output end of the generator set, the direct-current common port of the lower bridge arm converter valve tower is connected with the direct-current negative output end of the generator set, and the single-phase alternating-current output ports of the upper bridge arm converter valve tower are respectively connected with the corresponding single-phase alternating-current output ports of the lower bridge arm converter valve tower through bridge arm inductors.
CN201910548760.9A 2019-06-24 2019-06-24 Lightning arrester valve tower, converter valve tower and converter device Active CN112134476B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103050955A (en) * 2012-12-07 2013-04-17 国网智能电网研究院 Over-voltage protection method for modularized multi-level voltage source commutation valve
CN204089616U (en) * 2014-09-28 2015-01-07 国家电网公司 A kind of high-pressure thyristor converter valve tower
CN104270016A (en) * 2014-09-28 2015-01-07 国家电网公司 Novel valve tower of thyristor converter valve
CN105931923A (en) * 2016-05-26 2016-09-07 许继电气股份有限公司 High-voltage DC circuit breaker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103050955A (en) * 2012-12-07 2013-04-17 国网智能电网研究院 Over-voltage protection method for modularized multi-level voltage source commutation valve
CN204089616U (en) * 2014-09-28 2015-01-07 国家电网公司 A kind of high-pressure thyristor converter valve tower
CN104270016A (en) * 2014-09-28 2015-01-07 国家电网公司 Novel valve tower of thyristor converter valve
CN105931923A (en) * 2016-05-26 2016-09-07 许继电气股份有限公司 High-voltage DC circuit breaker

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