CN111030478B - Flexible direct-current power module with multi-level explosion-proof and protection structure - Google Patents
Flexible direct-current power module with multi-level explosion-proof and protection structure Download PDFInfo
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- CN111030478B CN111030478B CN201911367759.2A CN201911367759A CN111030478B CN 111030478 B CN111030478 B CN 111030478B CN 201911367759 A CN201911367759 A CN 201911367759A CN 111030478 B CN111030478 B CN 111030478B
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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
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20927—Liquid coolant without phase change
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- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
Abstract
The invention provides a flexible direct-current power module with multi-level explosion-proof and protection functions. The direct current busbar assembly is provided with a busbar fixing plate in the middle, circular metal gaskets are arranged on two sides of the direct current busbar assembly, the direct current busbar assembly is fixed through high-strength bolts, and the direct current busbar assembly and the connecting parts are prevented from being broken, broken and arc-drawn and other destructive consequences when the direct current busbar assembly and the electrical connecting parts bear great electric power. The axial buffer action of the disc spring on the guide sleeve in the power device crimping assembly can prevent hard impact from damaging mechanical parts in the crimping assembly under extreme conditions, and after extreme faults, the power device in the crimping assembly can be continuously and stably in through flow. The multi-level protection measures of the water pipe assembly protect the water pipe assembly from being damaged by machinery and electric arcs to a great extent.
Description
Technical Field
The invention relates to the technical field of data transmission of a flexible direct-current power transmission converter valve, in particular to a flexible direct-current power module with a multi-level explosion-proof and protection structure.
Background
The power module is a core unit of the flexible direct current converter valve, power devices in the converter valve are concentrated inside the power module, and the flexible direct current power module is high in current and large in capacitor capacity value, so that the power density and the energy density are high. When the power module has extreme fault conditions such as a through short circuit and the like, the capacitor discharges to the power device and the direct-current busbar in the short circuit loop, the power device in the crimping assembly is locally concentrated and quickly released by the extreme discharge current to cause the ceramic shell to break, and the water pipe in the power module can be broken by the transient impact stress of broken ceramic shell fragments. Extreme discharge current can also make positive and negative direct current female arranging produce very big electric power between the female arranging, make the female deformation that can not predict of arranging of direct current, probably produce the clearance and lead to drawing an arc at electrical connection position when serious, draw an arc and can further destroy the direct current female arranging, electric arc can fuse the water pipe even and lead to power module to leak, in case the water pipe leaks the converter valve and will stop the operation, its harm is very serious. Therefore, in order to enhance the explosion-proof and protection capabilities of the power module and ensure the safety and reliability of the power module in operation under extreme working conditions, multilevel explosion-proof and protection designs must be made on main components in the power module.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a flexible direct current power module with a multi-level explosion-proof and protection structure, and multi-level explosion-proof and protection design is carried out on a main component crimping assembly, a direct current busbar assembly, a water pipe assembly and a power module shell assembly in the power module.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a gentle straight power module with explosion-proof and protective structure of multilevel, power module be box formula structure, including shell subassembly (4) and the inside power device crimping subassembly (1) of shell, the female subassembly (2) and the water pipe subassembly (3) of arranging of direct current of box.
The direct-current busbar assembly (2) comprises a positive direct-current busbar (12), a negative direct-current busbar (14), a busbar fixing plate (13), a round metal gasket (15), a rectangular metal gasket (17) and a high-strength bolt (16); the bus bar fixing plate (13) is arranged between the positive direct current bus bar (12) and the negative direct current bus bar (14), the circular metal gaskets (15) are arranged on two sides of the positive direct current bus bar (12) and the negative direct current bus bar (14), the positive direct current bus bar (12) and the negative direct current bus bar (14) are tightly pressed through the high-strength bolts (16), and the lap joint surface of the direct current bus bar assembly (2) is reliably connected to the power device crimping assembly (1) through the rectangular metal gaskets (17); meanwhile, the metal plate forming process is utilized to bend and strengthen the position of the positive direct current bus (12) and the position of the negative direct current bus (14) of the direct current bus (2).
The power device crimping assembly (1) comprises a top plate (8), a side plate (7), a power device (5), a water-cooling radiator (6), a guide sleeve (10), a disc spring (9) and a top bolt (11); the side plate (7) is installed on the side face of the lower end of the top plate (8), the guide sleeve (10) is installed on the top plate (8) and can axially move on the top plate (8), the disc spring (9) is installed on the guide sleeve (10) and can axially extend and retract in the power device crimping assembly (1), the top bolt (11) is installed on the guide sleeve (10), preset pressing force is applied to the power device (5) and the water-cooled radiator (6) through the top bolt (11), so that the heat dissipation surface of the power device (5) is tightly attached to the water-cooled radiator (6), and the preset pressing force is kept through the disc spring (9).
The shell assembly (4) comprises a power module base (21), a side sealing plate (22), a front panel (22) and an upper cover plate (24); a vent hole is formed only in the local part of the side sealing plate (22); the power module base (21) is used for supporting and connecting the main components of the power module: the power device compression joint assembly (1), the direct current busbar assembly (2) and the water pipe assembly (3); the power module base (21), the side sealing plates (22), the front panel (23) and the upper cover plate (24) form a totally-enclosed protective structure of the power module.
The water pipe assembly (3) comprises a water pipe (19) outside the water-cooled radiator and a water pipe (20) spanning the water-cooled radiator, and the protection part of the water pipe assembly (3) comprises the water-cooled radiator (6), a side plate (7), an anti-explosion baffle (18) and a side sealing plate (22); the water pipe assembly (3) is installed on the side face of the water-cooled radiator (6), the side plate (7) is installed between the water pipe assembly and the water-cooled radiator (6), the anti-explosion baffle (18) is installed on the side plate (7), and the side sealing plate (22) is installed on the side face of the outermost side of the power module.
Compared with the prior art, the invention has the beneficial effects that:
1. under the extreme fault state, the capacitor discharges to the short-circuit point through the direct-current busbar, and the discharging current not only can enable the direct-current busbar to generate extremely high heat, but also can generate extremely high electric power between the positive direct-current busbar and the negative direct-current busbar due to electromagnetic induction. The extremely high heat can reduce the mechanical strength of the direct-current busbar, and simultaneously superpose extremely high electrodynamic force, the direct-current busbar will produce unpredictable deformation and fracture, and in severe cases, gaps may be generated at the electrical connection part to cause arc discharge, and the arc discharge can further destroy the direct-current busbar and even can fuse the water pipe to cause the power module to leak water. Through the explosion-proof enhancement design of the direct-current busbar assembly and the electrical connection part, the local reinforcement is carried out on the position where the direct-current busbar is large in stress and easy to deform under transient large current, the deformation resistance under extreme working conditions is improved, and the destructive consequences such as breakage, arc discharge and the like of the direct-current busbar assembly and the connection part are avoided when the direct-current busbar assembly bears great electric power;
2. under the extreme fault state, the water pipe assembly outside the water-cooled radiator is shielded by the side surface of the water-cooled radiator along the water-cooled radiator and is not damaged by the broken ceramic shell. The water pipe assembly crossing the water-cooled radiator is firstly shielded by the side plate, and on the basis, an explosion-proof baffle is additionally arranged between the water pipe assembly crossing the water-cooled radiator and the power device to prevent the water pipe assembly from being damaged by machinery and electric arcs. The side sealing plates are added outside the power module to prevent solid fragments outside from damaging the water pipe assembly. The multi-level protection measures protect the water pipe assembly from being damaged by machinery and electric arcs to the great extent;
3. under an extreme fault state, the totally-enclosed protective structure ensures that the transient electromagnetic property of a fault power module does not influence the normal operation of the adjacent power module, can further prevent the fragments from damaging the adjacent and lower power modules at the moment of the fracture of the ceramic shell of the power device, and realizes the double protection of the protective design;
4. under the extreme fault state, the power device can generate local energy concentration and release quickly, and the disc spring can buffer the axial transient impact stress generated when the power device is in the extreme fault state while keeping the axial pressing force of the crimping assembly inside the crimping assembly, so that the damage of hard impact on mechanical parts in the crimping assembly is avoided. After extreme faults occur, the displacement in the crimping assembly can be restored to the original state through the spring structure, the axial pressing force borne by each power device is not lost, the preset pressing force can be basically kept unchanged, and the continuous and stable through flow of the power devices in the crimping assembly is ensured.
Drawings
Fig. 1 is a schematic diagram of an internal structure of a soft-direct power module;
fig. 2 is a schematic structural diagram of a dc busbar assembly;
FIG. 3 is a partial schematic view of a power device crimping assembly configuration;
FIG. 4 is a partial schematic view of the containment structure of the water tube assembly;
fig. 5 is a schematic diagram of a compliant power module case assembly shielding structure.
Wherein: 1-power device crimping component 2-direct current busbar component 3-water pipe component 4-power module housing component 5-power device 6-water-cooling radiator 7-side plate 8-top plate 9-disc spring 10-guide sleeve 11-top bolt 12-positive direct current busbar 12-1-positive direct current busbar bending position one 12-2-positive direct current busbar bending position two 13-busbar fixing plate 14-negative direct current busbar 14-1-negative direct current busbar bending position one 14-2-negative direct current busbar bending position two 15-round metal gasket 16-high-strength bolt 17-rectangular metal gasket 18-explosion-proof baffle plate 19-water pipe 20 outside water-cooling radiator-water pipe 21-power module base 22-side sealing plate 23-front panel 24-upper cover Board
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1-5, a flexible direct current power module with a multi-level explosion-proof and protection structure is a box structure and comprises a shell component (4) of a box, a power device crimping component (1) inside the shell, a direct current busbar component (2) and a water pipe component (3).
As shown in fig. 2, the dc busbar assembly (2) includes a positive dc busbar (12), a negative dc busbar (14), a busbar fixing plate (13), a circular metal gasket (15), a rectangular metal gasket (17), and a high-strength bolt (16); the bus bar fixing plate (13) is arranged between the positive direct current bus bar (12) and the negative direct current bus bar (14), the circular metal gaskets (15) are arranged on two sides of the positive direct current bus bar (12) and the negative direct current bus bar (14), the positive direct current bus bar (12) and the negative direct current bus bar (14) are tightly pressed through the high-strength bolts (16), and the lap joint surface of the direct current bus bar assembly (2) is reliably connected to the water-cooling radiator (6) of the power device crimping assembly (1) through the rectangular metal gaskets (17); meanwhile, the metal plate forming process is utilized to bend and strengthen the positions (12-1 and 12-2) of the positive direct current busbar (12) and the positions (14-1 and 14-2) of the negative direct current busbar (14) of the direct current busbar (2), and the positions of the direct current busbar, which are relatively large in stress and easily deformed under transient large current, are locally strengthened, so that the deformation resistance under extreme working conditions is improved.
As shown in fig. 3, the power device crimping assembly (1) comprises a top plate (8), a side plate (7), a power device (5), a water-cooled heat sink (6), a guide sleeve (10), a disc spring (9) and a top bolt (11); the side plate (7) is installed on the side face of the lower end of the top plate (8), the guide sleeve (10) is installed on the top plate (8) and can axially move on the top plate (8), the disc spring (9) is installed on the guide sleeve (10) and can axially extend and retract in the power device crimping assembly (1), the top bolt (11) is installed on the guide sleeve (10), preset pressing force is applied to the power device (5) and the water-cooled radiator (6) through the top bolt (11), so that the heat dissipation surface of the power device (5) is tightly attached to the water-cooled radiator (6), and the preset pressing force is kept through the disc spring (9).
As shown in fig. 4, the water pipe assembly (3) comprises a water pipe (19) outside the water-cooled radiator and a water pipe (20) spanning the water-cooled radiator, and the protective part of the water pipe assembly (3) comprises a water-cooled radiator (6), a side plate (7), an explosion-proof baffle plate (18) and a side sealing plate (22); the water pipe assembly (3) is installed on the side face of the water-cooled radiator (6), the side plate (7) is installed between the water pipe assembly and the water-cooled radiator (6), the anti-explosion baffle (18) is installed on the side plate (7), and the side sealing plate (22) is installed on the side face of the outermost side of the power module.
As shown in fig. 5, the housing assembly (4) includes a power module base (21), a side cover plate (22), a front panel (22) and an upper cover plate (24); only the part of the side sealing plate (22) which needs ventilation and heat dissipation is provided with a ventilation hole; the power module base (21) is used for supporting and connecting the main components of the power module: the power device compression joint assembly (1), the direct current busbar assembly (2) and the water pipe assembly (3); the left side and the right side of each side sealing plate (22) are respectively installed on the lateral surface of the outer side of the power module, a front panel (23) is installed in front of the outer side of the power module, and an upper cover plate (24) is installed above the outer side of the power module; the power module base (21), the side sealing plates (22), the front panel (23) and the upper cover plate (24) form a totally-enclosed protective structure of the power module.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (3)
1. A flexible direct-current power module with a multi-level explosion-proof and protection structure is of a box body type structure and is characterized by comprising a shell assembly (4) of a box body, a power device crimping assembly (1) inside the shell, a direct-current busbar assembly (2) and a water pipe assembly (3);
the direct-current busbar assembly (2) comprises a positive direct-current busbar (12), a negative direct-current busbar (14), a busbar fixing plate (13), a round metal gasket (15), a rectangular metal gasket (17) and a high-strength bolt (16); the bus fixing plate (13) is arranged between the positive direct-current bus (12) and the negative direct-current bus (14), the circular metal gasket (15) is arranged on two sides of the positive direct-current bus (12) and the negative direct-current bus (14), the positive direct-current bus (12) and the negative direct-current bus (14) are compressed through the high-strength bolt (16), and the lap joint surface of the direct-current bus assembly (2) is reliably connected to the power device crimping assembly (1) through the rectangular metal gasket (17); meanwhile, bending and reinforcing the positions of the positive direct-current busbar (12) and the negative direct-current busbar (14) of the direct-current busbar assembly (2) by using a sheet metal forming process;
the power device crimping assembly (1) comprises a top plate (8), a side plate (7), a power device (5), a water-cooling radiator (6), a guide sleeve (10), a disc spring (9) and a top bolt (11); the side plate (7) is installed on the side face of the lower end of the top plate (8), the guide sleeve (10) is installed on the top plate (8) and can axially move on the top plate (8), the disc spring (9) is installed on the guide sleeve (10) and can axially extend and retract in the power device crimping assembly (1), the top bolt (11) is installed on the guide sleeve (10), preset pressing force is applied to the power device (5) and the water-cooled radiator (6) through the top bolt (11), so that the heat dissipation surface of the power device (5) is tightly attached to the water-cooled radiator (6), and the preset pressing force is kept through the disc spring (9).
2. A flexible direct power module with multi-level explosion-proof and protection structure according to claim 1, characterized in that the housing assembly (4) comprises a power module base (21), side sealing plates (22), a front panel (23) and an upper cover plate (24); a vent hole is formed only in the local part of the side sealing plate (22); the power module base (21) is used for supporting and connecting the main components of the power module: the power device compression joint assembly (1), the direct current busbar assembly (2) and the water pipe assembly (3); the power module base (21), the side sealing plates (22), the front panel (23) and the upper cover plate (24) form a totally-enclosed protective structure of the power module.
3. The flexible direct power module with the multilevel explosion-proof and protection structure according to claim 2, wherein the water pipe assembly (3) comprises a water pipe (19) outside the water-cooled radiator and a water pipe (20) across the water-cooled radiator, and the protection components of the water pipe assembly (3) comprise the water-cooled radiator (6), a side plate (7), an explosion-proof baffle plate (18) and a side sealing plate (22); the water pipe assembly (3) is installed on the side face of the water-cooled radiator (6), the side plate (7) is installed between the water pipe assembly and the water-cooled radiator (6), the anti-explosion baffle (18) is installed on the side plate (7), and the side sealing plate (22) is installed on the side face of the outermost side of the power module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911367759.2A CN111030478B (en) | 2019-12-26 | 2019-12-26 | Flexible direct-current power module with multi-level explosion-proof and protection structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911367759.2A CN111030478B (en) | 2019-12-26 | 2019-12-26 | Flexible direct-current power module with multi-level explosion-proof and protection structure |
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| CN111030478A CN111030478A (en) | 2020-04-17 |
| CN111030478B true CN111030478B (en) | 2022-01-04 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103354232A (en) * | 2013-06-17 | 2013-10-16 | 许继集团有限公司 | Parallel sub-module for VSC-HVDC (voltage source converter high voltage direct current) |
| CN104660016A (en) * | 2015-01-16 | 2015-05-27 | 浙江海得新能源有限公司 | Power system structure |
| CN107171569A (en) * | 2017-05-10 | 2017-09-15 | 许继电气股份有限公司 | Flexible direct current transmission converter valve and its submodule, heat sink assembly |
| CN107359801A (en) * | 2017-08-30 | 2017-11-17 | 特变电工新疆新能源股份有限公司 | A kind of compression joint type IEGT flexible DC power transmission power models |
| CN207530696U (en) * | 2017-10-13 | 2018-06-22 | 科诺伟业风能设备（北京）有限公司 | A kind of water cooling (PCC) power of high-power double-feed current transformer |
-
2019
- 2019-12-26 CN CN201911367759.2A patent/CN111030478B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354232A (en) * | 2013-06-17 | 2013-10-16 | 许继集团有限公司 | Parallel sub-module for VSC-HVDC (voltage source converter high voltage direct current) |
| CN104660016A (en) * | 2015-01-16 | 2015-05-27 | 浙江海得新能源有限公司 | Power system structure |
| CN107171569A (en) * | 2017-05-10 | 2017-09-15 | 许继电气股份有限公司 | Flexible direct current transmission converter valve and its submodule, heat sink assembly |
| CN107359801A (en) * | 2017-08-30 | 2017-11-17 | 特变电工新疆新能源股份有限公司 | A kind of compression joint type IEGT flexible DC power transmission power models |
| CN207530696U (en) * | 2017-10-13 | 2018-06-22 | 科诺伟业风能设备（北京）有限公司 | A kind of water cooling (PCC) power of high-power double-feed current transformer |
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| CN111030478A (en) | 2020-04-17 |
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Address after: 114000 212 Yue Ling Road, Anshan, Liaoning Applicant after: Rongxin Huike Electric Co.,Ltd. Address before: 114000 212 Yue Ling Road, Anshan, Liaoning Applicant before: RONGXIN HUIKE ELECTRIC TECHNOLOGY Co.,Ltd. |
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