CN117748427A - Low-inductance integrated combined high-voltage direct-current breaker power submodule - Google Patents
Low-inductance integrated combined high-voltage direct-current breaker power submodule Download PDFInfo
- Publication number
- CN117748427A CN117748427A CN202311769960.XA CN202311769960A CN117748427A CN 117748427 A CN117748427 A CN 117748427A CN 202311769960 A CN202311769960 A CN 202311769960A CN 117748427 A CN117748427 A CN 117748427A
- Authority
- CN
- China
- Prior art keywords
- power
- diversion
- layers
- module
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002788 crimping Methods 0.000 claims abstract description 35
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000005265 energy consumption Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Landscapes
- Rectifiers (AREA)
Abstract
The invention discloses a low-inductance integrated combined high-voltage direct current breaker power sub-module, wherein sub-module power devices are connected in a crimping manner, crimping parts are crimped among the power devices and comprise connecting blocks, the top and the bottom of each crimping part are respectively connected with an insulating block, the power devices of a single-side bridge arm are fixed between two bottom plates, and four supporting rods are connected around the bottom plates through nuts. The power device is characterized in that the sub-module busbar is connected to the side face of the power device, the busbar consists of five insulating layers and four diversion layers, the insulating layers and the diversion layers are alternately arranged, the insulating layers are arranged on two sides of the outermost layer of the busbar, the connection blocks between the busbar diversion layers and the power device are connected, and holes are uniformly distributed on the diversion layers and the insulating layers and used for connecting the connection blocks. The invention integrates the full-bridge circuit on the resonance branch of the combined high-voltage direct-current circuit breaker into a smaller structure, improves the space utilization rate and reduces the volume of the whole circuit breaker device.
Description
Technical Field
The invention belongs to the field of direct current circuit breakers, and particularly relates to a low-inductance integrated combined high-voltage direct current circuit breaker power sub-module.
Background
Along with the increase of the proportion of new energy power generation to the total power generation, the electric energy quality requirement is continuously improved, the alternating current power grid can not meet the requirements of users gradually, and the direct current power transmission starts to be focused widely. In order to realize the practical application of direct current transmission, related equipment of high-voltage direct current transmission and flexible direct current transmission needs to be researched, and a high-voltage direct current breaker is used as key equipment for breaking fault current, so that the research and optimization are focused on at home and abroad.
The high-voltage direct-current short circuit device current conversion branch circuit adopts a sub-module cascading mode, and a power device is installed on each sub-module according to the current conversion requirement.
The prior art suffers from the following drawbacks;
1. the direct connection of the devices can generate stray inductance due to electromagnetic induction, the current change rate in the circuit breaker is high, and the small stray inductance can generate great influence to influence the normal running of the current conversion process;
2. under the condition of the same stray inductance value, the overshoot peak value of the turn-off currents at the two ends of the IGCT in the diode full-bridge assembly and the voltage peak value of the buffer capacitor are higher than those of the IGCT full-bridge assembly, and the diode full-bridge assembly is more easily influenced by the stray inductance;
3. the distribution and dispersion of devices are unfavorable for module integration, the size of the devices required by the circuit breaker is large, and the distribution and dispersion can increase the space required by the overall circuit breaker.
Disclosure of Invention
Based on the problems in the prior art, stray inductance generated by device connection and arrangement is reduced; the current and voltage peak value of the device is reduced as much as possible, and the stress pressure of the device is relieved; the invention provides a low-inductance integrated combined high-voltage direct-current breaker power sub-module, which enables integrated module devices to reasonably utilize space.
The utility model provides a low integrated combination formula high voltage direct current circuit breaker power submodule piece of feeling, be applied to combination formula high voltage direct current circuit breaker, when the line fault, the circuit breaker begins work, and main tributary switch fires, shifts fault current to the resonance branch that power submodule piece was located, and the submodule turns on the IGCT in the module according to given control signal, inserts resonance circuit with the charging capacitor in the branch road for resonance current constantly increases oscillation, lets its zero passage, shifts fault current to the power consumption branch road again, accomplishes the disconnection. The power devices of the sub-modules are connected in a crimping manner, crimping parts are crimped among the power devices and comprise connecting blocks, the top and the bottom of each crimping part are respectively connected with an insulating block, the power devices of the single-side bridge arms are fixed between two bottom plates, and four supporting rods are connected around the bottom plates through nuts. The power device is characterized in that the sub-module busbar is connected to the side face of the power device, the busbar consists of five insulating layers and four diversion layers, the insulating layers and the diversion layers are alternately arranged, the insulating layers are arranged on two sides of the outermost layer of the busbar, the connection blocks between the busbar diversion layers and the power device are connected, and holes are uniformly distributed on the diversion layers and the insulating layers and used for connecting the connection blocks. The insulating layer and the diversion layer are square plates. The power device is composed of two identical parts, wherein the two parts are respectively two side bridge arms of a bridge circuit, and the two parts are connected through a side busbar and the same diversion layer. The connecting block is connected with the busbar through four connecting columns, threads are distributed on the connecting columns, and the connecting blocks are matched with nuts to fix the busbar on the side face of the crimping part of the power submodule.
Further, the power device of each part comprises 2 IGCT and 4 diodes; the power devices are connected in a crimping manner, crimping parts are crimped between the power devices, each crimping part comprises a plurality of connecting blocks, the top and the bottom of each crimping part are respectively connected with an insulating block, the power devices of the single-side bridge arm are fixed between the upper base plate and the lower base plate, and four supporting rods are connected around the upper base plate and the lower base plate through four nuts.
Further, the crimping portion includes a connection block a1, a connection block a2, a connection block a3, a connection block a4, a connection block a5, a connection block a6, a connection block a7; the four layers of the diversion layer are respectively a diversion layer b1, a diversion layer, a b2, a diversion layer b3 and a diversion layer b4; the connection mode of each connecting block and the busbar diversion layer is as follows: the connecting blocks a1 and a3 of the two parts are connected with the flow guiding layer b 1; the connecting blocks a5 and a7 of the two parts are connected with the flow guiding layer b 2; the left part connecting block a2, the connecting block a4 and the connecting block a6 are connected with the diversion layer b 3; the right-side connection blocks a2, a4, and a6 are connected to the guide layer b 4.
The low-inductance integrated combined high-voltage direct current breaker power sub-module structure has the following advantages:
1. the side busbar in the invention is four-layer busbar, and the current direction between each layer is approximately opposite when the submodule is in current passing, so that the generation of stray inductance is greatly reduced.
2. According to the invention, the power devices are connected in a crimping manner, the connecting blocks are crimped among the power devices, the crimping manner increases the surface area of the connection among the devices, the heat dissipation efficiency is improved, the resistance is reduced, the connecting blocks with larger surface area are increased, and the heat dissipation efficiency and the resistance reduction are further improved. And two identical diodes are connected in parallel in the same direction on a single bridge arm circuit, so that the stress of the device is reduced.
3. The full-bridge circuit on the resonance branch of the high-voltage direct-current circuit breaker is integrated into a smaller structure, so that the space utilization rate is improved, and the volume of the whole circuit breaker device is reduced.
Drawings
FIG. 1 is a schematic diagram of a power sub-module model;
FIG. 2 is a front view of a power sub-module model;
FIG. 3 is a side view of a power sub-module model;
fig. 4 is a top view of a power sub-module model.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Referring to fig. 1 to 4, a low inductance integrated combined high voltage direct current breaker power sub-module is composed of two parts, namely a left part and a right part, wherein the two parts are identical in structure, only one part is used for description below, and each part of power device comprises 2 IGCT modules: IGCTc2, IGCT c5 and 4 diodes: diode c1, diode c3, diode c4, diode c6 adopts the crimping mode to connect, and the crimping has the crimping part between the power device, and the crimping part includes connecting block a1, connecting block a2, connecting block a3, connecting block a4, connecting block a5, connecting block a6, connecting block a7, and an insulating piece is connected respectively to crimping part top and bottom: the power devices of the single-side bridge arms are fixed between the upper base plate 1 and the lower base plate 2, four supporting rods are connected to the periphery of the upper base plate and the periphery of the lower base plate through four nuts, and the four nuts are respectively a first nut 9, a second nut 10, a third nut 11 and a fourth nut 12; the four support rods are respectively a first support rod 5, a second support rod 6, a third support rod 7 and a fourth support rod 8.
The busbar 13 is connected to the side surface of the power device, and the busbar 13 consists of five layers of insulating layers and four layers of diversion layers, namely an insulating layer d1, an insulating layer d2, an insulating layer d3, an insulating layer d4, an insulating layer d5, a diversion layer b1, a diversion layer, a b2, a diversion layer b3 and a diversion layer b4; the insulating layers and the diversion layers are alternately arranged, the insulating layers are arranged on two sides of the outermost layer of the busbar 13, the diversion layers of the busbar are connected with connecting blocks between the power devices, and holes are uniformly arranged on the diversion layers and the insulating layers and are used for connecting the connecting blocks. The insulating layer and the diversion layer are square plates.
The connection mode of each connecting block and the busbar diversion layer is as follows: the connecting blocks a1 and a3 of the two parts are connected with the flow guiding layer b 1; the connecting blocks a5 and a7 of the two parts are connected with the flow guiding layer b 2; the left part connecting block a2, the connecting block a4 and the connecting block a6 are connected with the diversion layer b 3; the right-side connection blocks a2, a4, and a6 are connected to the guide layer b 4.
The connecting blocks are connected with the busbar through four connecting columns, namely a connecting column 14, a connecting column 15, a connecting column 16 and a connecting column 17; the connecting column is provided with threads, and the connecting column is matched with the nuts to fix the busbar on the side surface of the crimping part of the power submodule.
The low-inductance integrated combined high-voltage direct current breaker power sub-module is applied to a combined high-voltage direct current breaker, when a line fails, the breaker starts to work, a main branch switch burns, fault current is transferred to a resonance branch where the power sub-module is located, the sub-module conducts an IGCT (integrated gate-on-transistor) in the module according to a given control signal, a charging capacitor in the branch is connected to the resonance circuit, so that the resonance current continuously amplifies and oscillates, zero crossing is achieved, and then the fault current is transferred to an energy consumption branch to complete the switching. The power devices of the sub-modules are connected in a crimping manner, crimping parts are crimped among the power devices and comprise connecting blocks, the top and the bottom of each crimping part are respectively connected with an insulating block, the power devices of the single-side bridge arms are fixed between two bottom plates, and four supporting rods are connected around the bottom plates through nuts. The power device is characterized in that the sub-module busbar is connected to the side face of the power device, the busbar consists of five insulating layers and four diversion layers, the insulating layers and the diversion layers are alternately arranged, the insulating layers are arranged on two sides of the outermost layer of the busbar, the connection blocks between the busbar diversion layers and the power device are connected, and holes are uniformly distributed on the diversion layers and the insulating layers and used for connecting the connection blocks. The insulating layer and the diversion layer are square plates. The crimping power device is composed of two identical parts, wherein the two parts are respectively bridge arms at two sides of a bridge circuit, and the two parts are connected with the same diversion layer through a side busbar. The connecting block is connected with the busbar through four connecting columns, threads are distributed on the connecting columns, and the connecting blocks are matched with nuts to fix the busbar on the side face of the crimping part of the power submodule.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (3)
1. The power sub-module is characterized in that the power sub-module is applied to the combined high-voltage direct-current circuit breaker, when a line fails, the combined high-voltage direct-current circuit breaker starts to work, a main branch switch burns, fault current is transferred to a resonance branch where the power sub-module is located, the sub-module conducts an IGCT (integrated gate-transistor) in the power sub-module according to a given control signal, a charging capacitor in the branch is connected to the resonance circuit, so that the resonance current continuously increases and oscillates, the resonance current is enabled to cross zero, and then the fault current is transferred to an energy consumption branch to finish switching; the power devices of the power sub-modules are connected in a crimping manner, crimping parts are crimped among the power devices, each crimping part comprises a connecting block, the top and the bottom of each crimping part are connected with an insulating block, the power devices of a single-side bridge arm are fixed between two bottom plates, and four supporting rods are connected around the bottom plates through nuts; the bus bar of the power sub-module is connected to the side face of the power device, the bus bar consists of five insulating layers and four diversion layers, the insulating layers and the diversion layers are alternately arranged, the insulating layers are arranged on two sides of the outermost layer of the bus bar, the diversion layers of the bus bar are connected with connecting blocks between the power device, and holes are distributed on the diversion layers and the insulating layers and used for connecting the connecting blocks; the insulating layer and the guide layer are square plates; the power sub-module is composed of two identical parts, wherein the two parts are respectively bridge arms at two sides of a bridge circuit and are connected through a side busbar and a same diversion layer; the connecting block is connected with the busbar through four connecting columns, threads are distributed on the connecting columns, and the connecting blocks are matched with nuts to fix the busbar on the side face of the crimping part of the power submodule.
2. The power sub-module of claim 1, wherein each portion of power devices comprises 2 IGCTs and 4 diodes; the power devices are connected in a crimping manner, crimping parts are crimped between the power devices, each crimping part comprises a plurality of connecting blocks, the top and the bottom of each crimping part are respectively connected with an insulating block, the power devices of the single-side bridge arm are fixed between the upper base plate and the lower base plate, and four supporting rods are connected around the upper base plate and the lower base plate through four nuts.
3. The power sub-module according to claim 2, wherein the crimping portion includes a connection block a1, a connection block a2, a connection block a3, a connection block a4, a connection block a5, a connection block a6, a connection block a7; the four layers of the diversion layer are respectively a diversion layer b1, a diversion layer b2, a diversion layer b3 and a diversion layer b4; the connection mode of each connecting block and the busbar diversion layer is as follows: the connecting blocks a1 and a3 of the two parts are connected with the flow guiding layer b 1; the connecting blocks a5 and a7 of the two parts are connected with the flow guiding layer b 2; the left part connecting block a2, the connecting block a4 and the connecting block a6 are connected with the diversion layer b 3; the right-side connection blocks a2, a4, and a6 are connected to the guide layer b 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311769960.XA CN117748427A (en) | 2023-12-21 | 2023-12-21 | Low-inductance integrated combined high-voltage direct-current breaker power submodule |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311769960.XA CN117748427A (en) | 2023-12-21 | 2023-12-21 | Low-inductance integrated combined high-voltage direct-current breaker power submodule |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117748427A true CN117748427A (en) | 2024-03-22 |
Family
ID=90279047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311769960.XA Pending CN117748427A (en) | 2023-12-21 | 2023-12-21 | Low-inductance integrated combined high-voltage direct-current breaker power submodule |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117748427A (en) |
-
2023
- 2023-12-21 CN CN202311769960.XA patent/CN117748427A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Soltau et al. | Development and demonstration of a medium-voltage high-power DC-DC converter for DC distribution systems | |
| CN107846210B (en) | Direct current is branch assembly, direct current circuit breaker for circuit breaker | |
| US20160268915A1 (en) | Submodule for modular multi-level converter and application thereof | |
| CN102044985B (en) | Phase module for three-level integrated gate-commutated thyristor frequency converter | |
| CN105556787A (en) | Modular multipoint power converter for high voltages | |
| EP2030233A1 (en) | Cooling and shielding of a high voltage converter | |
| CN108134384B (en) | Staggered connection soft switch hybrid multi-level direct current interconnected converter | |
| CN101546964A (en) | Module combined multi-level converter | |
| CN105895458A (en) | DC circuit breaker and power assembly for transfer branch of DC circuit breaker | |
| CN105703388A (en) | Photovoltaic grid-connected power generation system based on middle and high voltage direct current access | |
| WO2018210352A1 (en) | Squarely arranged hybrid direct current circuit breaker valve structure | |
| CN115241850B (en) | Combined high-voltage direct-current breaker and control strategy thereof | |
| CN111092544A (en) | Direct current transformer subunit and direct current transformer comprising same | |
| CN104796025A (en) | Sub-module topological structure of modular multilevel converter | |
| CN101447740A (en) | High-voltage converter current transforming unit with modularized space structure | |
| Kim et al. | DC fault protection for modular multilevel converter HVDC using asymmetrical unipolar full-bridge submodule | |
| CN117748427A (en) | Low-inductance integrated combined high-voltage direct-current breaker power submodule | |
| CN111541392A (en) | Medium voltage converter three-level power module topology module and device | |
| CN103354231A (en) | IGBT power unit and sub-module for VSC-HVDC (voltage source converter high voltage direct current) | |
| CN206023592U (en) | The tri- level power units of compression joint type IGBT that a kind of new use heat-pipe radiator radiates | |
| CN211089475U (en) | Parallel structure of electric locomotive four-quadrant power module IGBT | |
| CN217590633U (en) | Bridge arm frequency division switching type modular multilevel converter topology | |
| CN204992583U (en) | Parallelly connected active power filter circuit based on three level circuit topology structure | |
| CN203243233U (en) | Power module for integrated gate commutated thyristor | |
| CN102709937B (en) | High-capacity combined converter used for electric energy storage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |