CN215897565U - Three-level direct current bus capacitance pool - Google Patents
Three-level direct current bus capacitance pool Download PDFInfo
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- CN215897565U CN215897565U CN202121711645.8U CN202121711645U CN215897565U CN 215897565 U CN215897565 U CN 215897565U CN 202121711645 U CN202121711645 U CN 202121711645U CN 215897565 U CN215897565 U CN 215897565U
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- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The utility model discloses a three-level direct current bus capacitance pool which comprises a shell assembly, a direct current bus assembly, a direct current capacitor, an insulating column and a wind channel plate, wherein the shell assembly is provided with a shell; 2 transverse reinforcing beams and 2 vertical reinforcing beams are arranged on the bottom surface of the shell assembly through pull rivets, and the joints of the transverse reinforcing beams and the vertical reinforcing beams are connected through the pull rivets; two short sides of casing assembly respectively are equipped with 2 enhancement corner fittings through drawing the rivet, two short sides of casing assembly respectively are equipped with 3 insulating columns through drawing the rivet and support the panel beating, respectively open 3 groups of louvres on the casing assembly both sides long side, the last a plurality of electric capacity mounting holes that is equipped with of casing assembly. The utility model separates the direct current capacitor group on the three-level power module, provides the three-level direct current bus capacitor pool, and can effectively reduce the difficulty of installation and maintenance of the power module.
Description
Technical Field
The utility model relates to the field of wind power generation, in particular to a three-level direct current bus capacitor pool.
Background
Compared with a two-level converter, the three-level converter has the advantages of large output capacity, high voltage, small current harmonic content, high efficiency and the like, so that the three-level converter is more and more applied to the field of wind power generation. Usually, the three-level power module includes a dc capacitor bank in addition to an Insulated Gate Bipolar Transistor (IGBT) module, for example, chinese patent CN201821716073.0, which discloses a three-level module and a structure thereof, and relates to the field of inverters. In the present invention, the three-level module includes: the conversion module and the capacitor assembly are arranged in the shell assembly, the capacitor assembly is arranged at one end of the conversion module in the first direction, the first direction extends along the extending direction of the shell assembly, and the capacitor assembly is arranged at one end of the conversion module in the first direction, so that the whole three-level module is approximately in a strip shape, the structure of the three-level module is compact, and the three-level module is convenient to mount and store, and the practicability of the three-level module is improved; obviously, the arrangement of the structure makes the three-level power module very large in volume and weight, and inconvenient to install and maintain.
With the trend that the single-machine capacity of the three-level converter is continuously increased, the number of IGBT modules and direct-current capacitors on a power module is generally increased, so that the volume and the weight of the power module are continuously increased, and great challenges are brought to installation and maintenance; to solve this problem, it is necessary to develop a three-level dc bus capacitor cell that can reduce the difficulty of installation and maintenance of the power module.
SUMMERY OF THE UTILITY MODEL
The utility model aims to separate direct current capacitor groups on a three-level power module aiming at the defects and shortcomings of the prior art, and provides a three-level direct current bus capacitor pool which can effectively reduce the difficulty in installation and maintenance of the power module.
The technical scheme adopted by the utility model is as follows: a three-level direct current bus capacitance pool structurally comprises a shell assembly, a direct current bus assembly, a direct current capacitor and an insulating column; a plurality of insulating columns are respectively arranged on two long side edges of the shell assembly through screws, and a plurality of insulating columns are respectively arranged on two short side edges of the shell assembly through screws; the direct current switching row assembly is connected together through screws according to the sequence of a direct current switching row cathode row, a direct current switching cathode neutral layer insulating film, a direct current switching neutral layer row, a direct current switching anode neutral layer insulating film, a direct current switching row anode row and a switching SMC insulating corner fitting; the direct-current busbar assembly is positioned and stacked together through nylon rivets according to the sequence of a direct-current busbar negative electrode bar, a negative electrode neutral level insulating film, a direct-current busbar neutral layer bar, a positive electrode neutral layer insulating film and a direct-current busbar positive electrode bar; the direct-current busbar assembly and the direct-current busbar assemblies are connected with the direct-current capacitors through flat pads, elastic pads and nuts, and after connection, the direct-current busbar negative electrode bar is in contact with the direct-current switching busbar negative electrode bar, the direct-current busbar neutral layer bar is in contact with the direct-current switching neutral layer bar, and the direct-current busbar positive electrode bar is in contact with the direct-current switching busbar positive electrode bar; two sides of the direct current busbar assembly are respectively connected with the insulating columns arranged on two short side edges of the shell assembly through screws; the direct current row assembly is connected with the insulating columns arranged on the two long sides of the shell assembly through screws; the nylon rivet can play a role in accurate positioning, so that the circular hole of the insulating film is superposed with the circular hole of the direct-current bus, and the direct-current bus assembly is ensured to be concentric with the electrode of the direct-current capacitor when being installed;
preferably, the bottom surface of the shell assembly is provided with 2 transverse reinforcing beams and 2 vertical reinforcing beams through pull rivets, and the joints of the transverse reinforcing beams and the vertical reinforcing beams are connected through the pull rivets.
Preferably, two short sides of casing assembly respectively are equipped with 2 enhancement corner fittings through drawing the rivet, two short sides of casing assembly respectively are equipped with 3 insulating columns through drawing the rivet and support the panel beating, respectively open 3 groups of louvres on the casing assembly both sides long side, be equipped with a plurality of electric capacity mounting holes on the casing assembly 1.
Preferably, each group of heat dissipation holes is uniformly provided with 24 8 × 8mm square holes.
Preferably, 1 air duct plate is respectively installed on two short side edges of the shell assembly through screws; the direct current capacitor is mounted on the housing assembly through a flat gasket and a nut.
Preferably, a total of 6 direct current row assemblies are installed to form 3 module installation areas, and each module installation area is provided with 2 direct current row assemblies with opposite directions.
In practical application, the three-level direct current bus capacitor pool is arranged in a converter cabinet, the electrode end of a capacitor faces downwards to form an inverted structure, 3 module installation areas are respectively provided with the power modules, and 2 power modules are arranged in each module installation area.
In practical application, the maintenance level of the capacitor pool is far lower than that of the power module, and in the converter using the capacitor pool, a direct current capacitor bank does not exist on the power module, so that the volume and the weight of the power module are greatly reduced, and the installation and the maintainability of the power module are improved.
According to the utility model, the cold-processed aluminum-clad zinc plate is used as the material of the shell component 1, a welding processing mode is completely abandoned, and the machinability is high;
the utility model can be divided into the following parts according to the trend of the main loop and the assembly requirement of the device and the functions: the direct current busbar assembly and the direct current busbar assembly can be assembled after being assembled respectively, and the direct current busbar assembly has the advantage of being simple to install.
When the converter provided by the utility model vibrates in operation or transportation, impact load transmitted on a direct current bus assembly at the joint of the three-level direct current bus capacitor pool and the module can be concentrated on the transfer SMC insulating corner fitting, so that damage of a direct current capacitor electrode connecting column due to impact load bearing can be effectively avoided, and the reliability of the converter is improved.
The utility model has strong applicability, when the energy density of the converter configuration is higher and the direct current capacitor heats seriously, the heat dissipation air duct can be formed by arranging the fans according to 3 groups of heat dissipation holes respectively arranged on the two long sides of the shell component, and air enters the capacitor cell to contact with the direct current capacitor and then flows out of the capacitor cell to take away the heat of the direct current capacitor.
The direct current direct bus assembly and the direct current bus assembly both adopt a lamination mode, the polarities of adjacent electrodes are different, stray inductance can be reduced, and the performance of a direct current capacitor and a power module in a converter is more stable.
Drawings
FIG. 1 is an isometric view of a three level DC bus capacitor cell of the present invention;
fig. 2 is an axonometric view of the dc busbar assembly according to the present invention;
fig. 3 is an exploded view of the dc busbar assembly according to the present invention;
FIG. 4 is an isometric view of the housing assembly of the present invention;
FIG. 5 is an isometric view of the housing assembly of the present invention;
FIG. 6 is a partial installation view of a three level DC bus capacitor cell according to the present invention;
FIG. 7 is an isometric view of a direct flow direct bank assembly according to the present invention;
FIG. 8 is an exploded view of the DC to DC bank assembly of the present invention;
fig. 9 is a schematic view of the installation of the present invention in use.
Description of reference numerals: 1. the shell assembly, 2, the direct current busbar assembly, 3, the direct current busbar assembly, 4, the direct current capacitor, 5, the insulating column, 6, the air duct plate, 11, the three-level direct current busbar capacitor cell, 12, the power module, 101, the insulating column supporting sheet metal, 102, the heat dissipation hole, 103, the transverse reinforcing beam, 104, the vertical reinforcing beam, 105, the reinforcing corner piece, 106, the capacitor mounting hole, 111, the module mounting area, 21, the switching SMC insulating corner piece, 22, the direct current busbar positive electrode row, 23, the direct current switching positive electrode neutral level insulating film, 24, the direct current switching neutral level insulating film, 25, the direct current switching negative electrode row, 26, the direct current switching row negative electrode row, 31, the direct current busbar negative electrode row, 32, the direct current busbar neutral layer row, 33, the direct current busbar positive electrode row, 34, the negative electrode neutral level insulating film, 35, the positive electrode neutral layer insulating film, 36, nylon rivet.
Detailed Description
The present invention will be further described with reference to fig. 1-9 and the following detailed description; the following examples will assist those skilled in the art in further understanding the utility model, but are not intended to limit the utility model in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the utility model. All falling within the scope of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model.
Referring to fig. 1 to 9, a three-level dc bus capacitor pool includes a housing assembly 1, a dc switching bar assembly 2, a dc bus bar assembly 3, a dc capacitor 4, an insulating column 5, and an air duct plate 6; the bottom surface of the shell component 1 is provided with 2 transverse reinforcing beams 103 and 2 vertical reinforcing beams 104 through pull rivets, and the joints of the transverse reinforcing beams 103 and the vertical reinforcing beams 104 are connected through the pull rivets; two short sides of casing assembly 1 respectively are equipped with 2 enhancement corner fittings 105 through drawing the rivet, 3 insulating columns that respectively are equipped with through drawing the rivet on two short sides of casing assembly 1 support panel beating 101, respectively open 3 groups of louvre 102 on the two long sides of casing assembly 1, every group louvre equipartition is provided with 24 8x8mm square holes, be equipped with 48 electric capacity mounting holes 106 on the casing assembly 1.
Referring to fig. 6, 6 insulation posts 5 are respectively mounted on two long sides of the housing assembly 1 through screws, and 3 insulation posts 5 are respectively mounted on two short sides of the housing assembly through screws; 1 air duct plate 6 is respectively arranged on the two short side edges through screws; 64 direct current capacitors 4 are mounted on the housing assembly 1 by flat washers and nuts.
Referring to fig. 2 and 3, the dc busbar assembly 3 is positioned together by 6 nylon rivets 36 in the order of a dc busbar negative bar 31, a negative neutral level insulating film 34, a dc busbar neutral level insulating film 32, a positive neutral level insulating film 35 and a dc busbar positive bar 33; the nylon rivet 36 can play a role in accurate positioning, so that the insulating film round hole is overlapped with the direct-current busbar round hole, and the direct-current busbar component 3 is ensured to be concentric with the electrode of the direct-current capacitor 4 when being installed.
Referring to fig. 7 and 8, the dc gang assembly 2 is screwed together in the order of the dc gang negative electrode row 26, the dc gang negative neutral layer insulating film 25, the dc gang neutral layer row 24, the dc gang positive electrode neutral layer insulating film 23, the dc gang positive electrode row 22, and the transit SMC insulating corner fitting 21; the direct current transfer row negative electrode row 26, the direct current transfer neutral layer row 24 and the direct current transfer row positive electrode row 22 are respectively connected and fixed with the transfer SMC insulating corner fitting 21 through 2 screws.
Referring to fig. 1, the dc busbar assemblies 3 and 6 dc busbar assemblies 2 are connected to the dc capacitor 4 through flat pads, elastic pads and nuts, and after connection, the dc busbar negative bar 31 is in contact with the dc busbar negative bar 26, the dc busbar neutral layer bar 32 is in contact with the dc busbar neutral layer bar 24, and the dc busbar positive bar 33 is in contact with the dc busbar positive bar 22; two sides of the direct current busbar assembly 3 are respectively connected with insulating columns 5 arranged on two short side edges of the shell assembly 1 through screws; the direct current row assembly 2 is connected with insulating columns 5 arranged on two long sides of the shell assembly 1 through screws; referring to fig. 1, a total of 6 dc patch panel assemblies 2 are installed to form 3 module installation areas 111, and each module installation area 111 is installed with 2 dc patch panel assemblies 2 facing opposite directions;
in the utility model, a three-level power module is connected to a direct current switching bank assembly 2 to form a power conversion core component of a three-level converter, and in practical application, referring to fig. 9, a three-level direct current bus capacitor cell of the utility model is arranged in a converter cabinet, a capacitor electrode end faces downwards to form a reverse hanging type structure, power modules 12 are respectively arranged in 3 module installation areas 111, and 2 power modules 12 are arranged in each module installation area 111.
In practical application, the maintenance level of the capacitor pool is far lower than that of the power module, and in the converter using the capacitor pool, a direct current capacitor bank does not exist on the power module, so that the volume and the weight of the power module are greatly reduced, and the installation and the maintainability of the power module are improved.
According to the utility model, the cold-processed aluminum-clad zinc plate is used as the material of the shell component 1, a welding processing mode is completely abandoned, and the machinability is high;
the utility model can be divided into the following parts according to the trend of the main loop and the assembly requirement of the device and the functions: the direct current busbar assembly 2 and the direct current busbar assembly 3 can be assembled after being assembled respectively, and the direct current busbar assembly has the advantage of being simple to install.
When the converter provided with the utility model vibrates in operation or transportation, impact load transmitted on the direct current bus capacitor cell 11 and the direct current bus assembly 2 at the module connecting part can be concentrated on the transfer SMC insulating corner piece 21, so that the direct current capacitor electrode connecting column can be effectively prevented from being damaged due to the impact load, and the reliability of the converter is improved.
The utility model has strong applicability, when the energy density of the converter configuration is higher and the direct current capacitor heats seriously, 3 groups of heat dissipation holes 102 arranged on two long sides of the shell component 1 can be provided with fans to form a heat dissipation air duct, so that air enters the capacitor pool and contacts with the direct current capacitor and then flows out of the capacitor pool to take away the heat of the direct current capacitor.
According to the utility model, the direct current bus assembly 2 and the direct current bus assembly 3 both adopt a lamination mode, the polarities of adjacent electrodes are different, stray inductance can be reduced, and the performance of a direct current capacitor and a power module in a converter is more stable.
The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. A three-level direct current bus capacitor pool is characterized by comprising a shell assembly (1), a direct current transfer row assembly (2), a direct current bus bar assembly (3), a direct current capacitor (4) and an insulating column (5); a plurality of insulating columns (5) are respectively arranged on two long sides of the shell component (1) through screws, and a plurality of insulating columns (5) are respectively arranged on two short sides of the shell component through screws;
the direct current transfer row assembly (2) is formed by connecting a direct current transfer row negative electrode row (26), a direct current transfer negative electrode neutral layer insulating film (25), a direct current transfer neutral layer row (24), a direct current transfer positive electrode neutral layer insulating film (23), a direct current transfer row positive electrode row (22) and a transfer SMC insulating corner piece (21) together through screws in sequence; the direct-current busbar assembly (3) is positioned and stacked together through a nylon rivet (36) according to the sequence of a direct-current busbar negative bar (31), a negative neutral level insulating film (34), a direct-current busbar neutral layer bar (32), a positive neutral layer insulating film (35) and a direct-current busbar positive bar (33);
the direct-current busbar assembly (3) and the direct-current busbar assemblies (2) are connected with the direct-current capacitor (4) through flat pads, elastic pads and nuts, after connection, a direct-current busbar negative electrode bar (31) is in contact with a direct-current switching busbar negative electrode bar (26), a direct-current busbar neutral layer bar (32) is in contact with a direct-current switching neutral layer bar (24), and a direct-current busbar positive electrode bar (33) is in contact with a direct-current switching busbar positive electrode bar (22); two sides of the direct current busbar assembly (3) are respectively connected with insulating columns (5) arranged on two short side edges of the shell assembly (1) through screws; the direct current row assembly (2) is connected with the insulating columns (5) arranged on the two long side edges of the shell assembly (1) through screws.
2. The three-level direct current bus capacitor cell as defined in claim 1, wherein 2 transverse reinforcing beams (103) and 2 vertical reinforcing beams (104) are installed on the bottom surface of the housing assembly (1) through rivets, and the joints of the transverse reinforcing beams (103) and the vertical reinforcing beams (104) are connected through the rivets.
3. The three-level direct current bus capacitor according to claim 2, wherein 2 reinforcing corner pieces (105) are respectively mounted on two short sides of the housing assembly (1) through pull rivets, 3 insulating column supporting metal plates (101) are respectively mounted on the two short sides of the housing assembly (1) through pull rivets, 3 groups of heat dissipation holes (102) are respectively formed in two long sides of the housing assembly (1), and a plurality of capacitor mounting holes (106) are formed in the housing assembly (1).
4. The three-level direct current bus capacitor cell as claimed in claim 3, wherein each set of heat dissipation holes is uniformly provided with 24 8x8mm square holes.
5. A three-level dc bus capacitor cell according to claim 3, characterized in that 1 air duct plate (6) is mounted on each of the two short sides of the housing assembly (1) by means of screws; the direct current capacitor (4) is arranged on the shell assembly (1) through a flat gasket and a nut.
6. A three-level dc bus capacitor cell according to claim 2, wherein a total of 6 dc busbars (2) are provided, forming 3 module mounting areas (111), each module mounting area (111) having 2 dc busbars (2) mounted thereon, facing in opposite directions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121711645.8U CN215897565U (en) | 2021-07-27 | 2021-07-27 | Three-level direct current bus capacitance pool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121711645.8U CN215897565U (en) | 2021-07-27 | 2021-07-27 | Three-level direct current bus capacitance pool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215897565U true CN215897565U (en) | 2022-02-22 |
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ID=80562541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121711645.8U Active CN215897565U (en) | 2021-07-27 | 2021-07-27 | Three-level direct current bus capacitance pool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215897565U (en) |
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2021
- 2021-07-27 CN CN202121711645.8U patent/CN215897565U/en active Active
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