CN109038632B - Converter valve submodule control loop unit, converter valve submodule assembly and converter valve - Google Patents
Converter valve submodule control loop unit, converter valve submodule assembly and converter valve Download PDFInfo
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- CN109038632B CN109038632B CN201810758661.9A CN201810758661A CN109038632B CN 109038632 B CN109038632 B CN 109038632B CN 201810758661 A CN201810758661 A CN 201810758661A CN 109038632 B CN109038632 B CN 109038632B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 230000000712 assembly Effects 0.000 claims description 11
- 238000000429 assembly Methods 0.000 claims description 11
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 8
- 238000005457 optimization Methods 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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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- 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 relates to a converter valve submodule control loop unit, a converter valve submodule assembly and a converter valve. When the control circuit unit of the converter valve submodule needs to be maintained or parts need to be replaced, the case can be detached firstly, and then the control circuit board in the case is overhauled and replaced. Compared with the prior art, the control circuit board of the converter valve submodule control loop unit is integrated on the same case, so that the installation and maintenance are convenient, and the problem that the converter valve submodule component in the prior art is inconvenient to install and maintain is solved.
Description
Technical Field
The invention relates to a converter valve submodule control loop unit, a converter valve submodule assembly and a converter valve.
Background
With the increasing problem of climate change and the increasing situation of energy supply safety and energy shortage, China will focus on optimizing energy structure and vigorously develop and utilize renewable energy. The intelligent, efficient and reliable direct-current transmission technology is constructed and always the key direction for the development and construction of the power grid in China.
As a new generation of dc transmission technology, flexible dc transmission technology represents a development direction of future dc transmission technology. The converter valve is a core device of a flexible direct-current transmission system, is similar to a system heart, breaks through key technologies of the converter valve and develops products, and is a great device technical requirement for supporting high-voltage large-capacity flexible direct-current transmission engineering construction. The converter valve is composed of thousands of sub-modules, wherein a converter valve sub-module control loop unit comprises a plurality of control circuit boards such as a high-voltage power supply board, a low-voltage power supply board, an SCE board and an IGBT drive, the control circuit boards bear the control, communication and protection logic processing of the sub-modules, and the working performance of the control circuit boards is usually determined whether a flexible and straight converter valve power transmission system can run reliably and stably. And each control circuit board in the existing converter valve submodule control loop unit is independently installed in a case or on a converter valve installation frame, which is not beneficial to the installation and maintenance of the converter valve.
Disclosure of Invention
The invention aims to provide a converter valve submodule control loop unit to solve the problem that a converter valve in the prior art is inconvenient to install and maintain; the invention also aims to provide a converter valve sub-module assembly and a converter valve which solve the problems.
The technical scheme of the converter valve submodule control loop unit is as follows:
the converter valve submodule control loop unit comprises a case, a back plate and at least two control circuit boards which are in conductive connection with the back plate and used for controlling the submodules are integrated in the case, and the back plate is used for being in conductive connection with submodule terminals of the submodules to control the submodules through the control circuit boards.
The converter valve submodule control loop unit has the advantages that: at least two control circuit boards are integrated in the same case, when the control circuit unit of the converter valve submodule is fixedly installed, the control circuit board integrated in the case is installed in the case and is in conductive connection with the back plate, and then the submodule terminals of the submodule are in conductive connection with the back plate; when the control circuit unit of the converter valve submodule needs to be maintained or parts need to be replaced, the case can be detached firstly, and then the control circuit board in the case is overhauled and replaced. Compared with the prior art, the control circuit board of the converter valve submodule control loop unit is integrated on the same case, so that the installation and maintenance are convenient, and the problem that the converter valve submodule component in the prior art is inconvenient to install and maintain is solved.
In order to facilitate the fixed connection of the converter valve submodule component, the case is provided with a case fixing structure for fixing the case on the submodule component, and the case is also provided with a wire passing hole for a lead electrically connected with the submodule terminal and the back plate to pass through. Therefore, the submodule and the converter valve submodule control loop unit are integrated on the case, only the converter valve submodule component is fixedly connected inside and outside the case, and the converter valve submodule component is convenient to fixedly connect.
In order to prevent the submodule terminals of the submodule from being soaked by rainwater, the case fixing structure and the wire passing holes are arranged on the bottom plate of the case in the scheme. The bottom plate can shelter from the rainwater like this, prevents that the submodule piece terminal of submodule piece from being soaked by the rainwater.
In order to prevent rainwater entering the case from flowing to the sub-module terminals along the wires, the wire passing hole of the bottom plate is provided with an annular boss in an upward protruding mode. The annular boss can block the rainwater at crossing the line hole periphery, avoids the rainwater to flow to submodule piece terminal along the wire, causes the incident.
In order to prevent rainwater from flowing to the sub-modules along the case, the annular convex edge used for shielding the sub-modules is convexly arranged below the middle bottom plate. The annular convex edge is shielded in the circumferential direction of the sub-module, so that rainwater can be effectively prevented from flowing to the sub-module along the case.
In order to avoid rainwater entering the case from remaining in the case and damaging electrical elements in the case, the bottom plate is provided with a flow guide hole which is positioned outside the annular convex edge and used for guiding water in the case to the outside of the case. Therefore, rainwater entering the case can flow out of the case through the diversion holes.
In consideration of the problem of stress deformation in the operation of the IGBT, the case is also provided with a slide rail which is in slide fit with the sub-module slide fit structure. Therefore, the case can be prevented from being damaged when the IGBT deforms, and the service life of the case is prolonged.
In order to facilitate the arrangement of the conducting wires for the conductive connection between the sub-module terminals and the control circuit board, at least one control circuit board is vertically arranged in the case. Therefore, the wire passing holes can be formed in the control circuit board which is vertically arranged, the number of the wires which need to pass through the control circuit board can be reduced, and the arrangement of the wires is convenient.
In order to facilitate the assembly of the case, the adjacent side plates of the case and the side plates and the cover plate are connected by buckles.
The technical scheme of the converter valve submodule component of the invention is as follows:
the converter valve submodule component comprises submodules and a converter valve submodule control loop unit used for controlling the submodules, the converter valve submodule control loop unit comprises a case, a back plate and at least two control circuit boards which are in conductive connection with the back plate and used for controlling the submodules are integrated in the case, and the back plate is in conductive connection with submodule terminals of the submodules to realize the control of the submodules by the control circuit boards.
At least two control circuit boards are integrated in the same case, when the control circuit unit of the converter valve submodule is fixedly installed, the control circuit board integrated in the case is installed in the case and is in conductive connection with the back plate, and then the submodule terminals of the submodule are in conductive connection with the back plate; when the control circuit unit of the converter valve submodule needs to be maintained or parts need to be replaced, the case can be detached firstly, and then the control circuit board in the case is overhauled and replaced. Compared with the prior art, the control circuit board of the converter valve submodule control loop unit is integrated on the same case, so that the installation and maintenance are convenient, and the problem that the converter valve submodule component in the prior art is inconvenient to install and maintain is solved.
In order to facilitate the fixed connection of the converter valve submodule component, the case is fixed on the submodule in the scheme, and the case is provided with a wire passing hole for a lead which is conductively connected with the submodule terminal and the back plate to pass through. The case is fixed on the sub-modules, the sub-modules and the converter valve sub-module control loop units are integrated on the case, only the converter valve sub-module assemblies are fixedly connected inside and outside the case, and the converter valve sub-module assemblies are conveniently fixedly connected.
In order to prevent the submodule terminals of the submodule from being soaked by rainwater, the case is fixed above the submodule in the scheme, and the wire passing hole is formed in the bottom plate of the case. The bottom plate is located the submodule piece terminal top of submodule piece like this, can shelter from the rainwater, prevents that the submodule piece terminal of submodule piece from being soaked by the rainwater.
In order to prevent rainwater entering the case from flowing to the sub-module terminals along the wires, the wire passing hole of the bottom plate is provided with an annular boss in an upward protruding mode. The annular boss can block the rainwater at crossing the line hole periphery, avoids the rainwater to flow to submodule piece terminal along the wire, causes the incident.
In order to prevent rainwater from flowing to the sub-modules along the case, the annular convex edge used for shielding the sub-modules is convexly arranged below the middle bottom plate. The annular convex edge is shielded in the circumferential direction of the sub-module, so that rainwater can be effectively prevented from flowing to the sub-module along the case.
In order to avoid rainwater entering the case from remaining in the case and damaging electrical elements in the case, the bottom plate is provided with a flow guide hole which is positioned outside the annular convex edge and used for guiding water in the case to the outside of the case. Therefore, rainwater entering the case can flow out of the case through the diversion holes.
In consideration of the problem of stress deformation in the operation of the IGBT, the sub-module is provided with a sub-module sliding fit structure which is in sliding fit with the case along the arrangement direction of the radiator and the IGBT of the sub-module. Therefore, the case can be prevented from being damaged when the IGBT deforms, and the service life of the case is prolonged.
In order to facilitate the fixed connection between the case and the sub-module, in the scheme, the case is fixed on the sub-module through a connecting piece, the connecting piece is provided with a first limiting part in abutting fit with the bottom plate and a second limiting part in blocking fit with the annular convex edge, the annular convex edge and the second limiting part are in blocking fit with the IGBT arrangement direction along the radiator of the sub-module, and the first limiting part or the second limiting part is fixedly connected with the case. The vertical limiting part of the connecting piece is matched with the annular convex edge stop to conveniently judge whether the case slides in place.
In order to ensure that the case is stably fixed on the sub-module, one end of the sub-module is provided with a sub-module fixing structure which is fixedly connected with the case so that the case is fixed on the sub-module, and the sub-module sliding fit structure is arranged at the other end of the sub-module. Therefore, the arrangement of the connection points of the case and the sub-modules is more reasonable, and the case is stably fixed on the sub-modules.
In the scheme, the sub-module is provided with a sliding groove, the case is provided with a sliding rail which is in sliding fit with the sliding groove, and the sliding groove forms the sliding fit structure of the sub-module. Through the sliding fit of the sliding rail and the sliding groove with larger contact area, the stability during sliding is improved.
In order to facilitate the arrangement of the conducting wires for the conductive connection between the sub-module terminals and the control circuit board, at least one control circuit board is vertically arranged inside the case. Therefore, the wire passing holes can be formed in the control circuit board which is vertically arranged, the number of the wires which need to pass through the control circuit board can be reduced, and the arrangement of the wires is convenient.
In order to facilitate the assembly of the case, the adjacent side plates of the case and the side plates and the cover plate are connected by buckles.
The technical scheme of the converter valve is as follows:
the converter valve comprises at least two converter valve submodule assemblies, each converter valve submodule assembly comprises a submodule and a converter valve submodule control loop unit used for controlling the submodule, each converter valve submodule control loop unit comprises a case, a back plate and at least two control circuit boards which are in conductive connection with the back plate and used for controlling the submodule are integrated in the case, and the back plate is in conductive connection with submodule terminals of the submodule to realize control of the submodule by each control circuit board.
In order to facilitate the fixed connection of the converter valve submodule component, the case is fixed on the submodule in the scheme, and the case is provided with a wire passing hole for a lead which is conductively connected with the submodule terminal and the back plate to pass through. The case is fixed on the sub-modules, the sub-modules and the converter valve sub-module control loop units are integrated on the case, only the converter valve sub-module assemblies are fixedly connected inside and outside the case, and the converter valve sub-module assemblies are conveniently fixedly connected.
In order to prevent the submodule terminals of the submodule from being soaked by rainwater, the case is fixed above the submodule in the scheme, and the wire passing hole is formed in the bottom plate of the case. The bottom plate is located the submodule piece terminal top of submodule piece like this, can shelter from the rainwater, prevents that the submodule piece terminal of submodule piece from being soaked by the rainwater.
In order to prevent rainwater entering the case from flowing to the sub-module terminals along the wires, the wire passing hole of the bottom plate is provided with an annular boss in an upward protruding mode. The annular boss can block the rainwater at crossing the line hole periphery, avoids the rainwater to flow to submodule piece terminal along the wire, causes the incident.
In order to prevent rainwater from flowing to the sub-modules along the case, the annular convex edge used for shielding the sub-modules is convexly arranged below the middle bottom plate. The annular convex edge is shielded in the circumferential direction of the sub-module, so that rainwater can be effectively prevented from flowing to the sub-module along the case.
In order to avoid rainwater entering the case from remaining in the case and damaging electrical elements in the case, the bottom plate is provided with a flow guide hole which is positioned outside the annular convex edge and used for guiding water in the case to the outside of the case. Therefore, rainwater entering the case can flow out of the case through the diversion holes.
In consideration of the problem of stress deformation in the operation of the IGBT, the sub-module is provided with a sub-module sliding fit structure which is in sliding fit with the case along the arrangement direction of the radiator and the IGBT of the sub-module. Therefore, the case can be prevented from being damaged when the IGBT deforms, and the service life of the case is prolonged.
In order to facilitate the fixed connection between the case and the sub-module, in the scheme, the case is fixed on the sub-module through a connecting piece, the connecting piece is provided with a first limiting part in abutting fit with the bottom plate and a second limiting part in blocking fit with the annular convex edge, the annular convex edge and the second limiting part are in blocking fit with the IGBT arrangement direction along the radiator of the sub-module, and the first limiting part or the second limiting part is fixedly connected with the case.
In order to ensure that the case is stably fixed on the sub-module, one end of the sub-module is provided with a sub-module fixing structure which is fixedly connected with the case so as to fix the case on the sub-module, and the sub-module sliding fit structure is arranged at the other end of the sub-module. Therefore, the arrangement of the connection points of the case and the sub-modules is more reasonable, and the case is stably fixed on the sub-modules.
In the scheme, the sub-module is provided with a sliding groove, the case is provided with a sliding rail which is in sliding fit with the sliding groove, and the sliding groove forms the sliding fit structure of the sub-module. Through the sliding fit of the sliding rail and the sliding groove with larger contact area, the stability during sliding is improved.
In order to facilitate the arrangement of the conducting wires for the conductive connection between the sub-module terminals and the control circuit board, at least one control circuit board is vertically arranged inside the case. Therefore, the wire passing holes can be formed in the control circuit board which is vertically arranged, the number of the wires which need to pass through the control circuit board can be reduced, and the arrangement of the wires is convenient.
In order to facilitate the assembly of the case, the adjacent side plates of the case and the side plates and the cover plate are connected by buckles.
Drawings
Fig. 1 is a schematic diagram of a converter valve sub-module control loop unit in an embodiment 1 of the converter valve of the present invention;
fig. 2 is a schematic structural diagram of a converter valve sub-module assembly in embodiment 1 of the converter valve of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a schematic structural diagram of the enclosure of FIG. 2;
FIG. 5 is a schematic structural view of a sub-module of FIG. 2;
FIG. 6 is a schematic structural diagram of the case of FIG. 2 without the control circuit board, the cover plate, the front plate and the rear plate;
FIG. 7 is a schematic structural diagram of the case of FIG. 6 with a control circuit board mounted thereon;
FIG. 8 is a schematic view of the structure of FIG. 7 from another perspective;
in the figure: 1-sub-module, 2-slide rail, 3-case, 4-dovetail groove, 5-IGBT, 6-connecting piece, 7-radiator, 8-back plate, 9-SCE plate, 10-low voltage power supply plate, 11-IGBT drive, 12-fuse plate, 13-high voltage power supply plate, 14-front side plate, 15-back side plate, 16-cover plate, 17-back plate plug terminal, 18-guide rail, 19-annular boss, 20-annular flange, 21-guide hole, 22-left side plate, 23-bottom plate, 24-line hole, 25-top plate, 61-radiator connecting hole, 62-case connecting hole, 141-buckle hole and 221-buckle.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In embodiment 1 of the converter valve of the present invention, as shown in fig. 1 to 8, the converter valve includes at least two converter valve submodule assemblies, each converter valve submodule assembly includes a submodule 1 and a converter valve submodule control circuit unit for controlling the submodule 1, the converter valve submodule control circuit unit includes a case 3, a backplane 8 and a control circuit board conductively connected to the backplane 8 for controlling the submodule are integrated in the case 3, and the backplane 8 is conductively connected to a submodule terminal of the submodule 1 to control the submodule 1 by each control circuit board. The control circuit board for controlling the sub-modules in the embodiment includes an SCE board 9, a low-voltage power board 10, an IGBT driver 11, a fuse board 12, and a high-voltage power board 13. In other embodiments, any two or more than three control circuit boards can be integrated in the chassis; other control boards not belonging to the above categories may also be integrated in the chassis. All the control circuit boards are integrated in the same case, and when the control circuit unit of the converter valve submodule is fixedly installed, all the control circuit boards are installed in the case and are in conductive connection with the back plate, and then the submodule terminals of the submodule are in conductive connection with the back plate; when the control circuit unit of the converter valve submodule needs to be maintained or parts need to be replaced, the case can be detached firstly, and then the control circuit board in the case is overhauled and replaced. Compared with the prior art, the control circuit board of the converter valve submodule control loop unit is integrated on the same case, so that the installation and maintenance are convenient, and the problem that the converter valve submodule component in the prior art is inconvenient to install and maintain is solved.
As shown in fig. 2 to 4, the casing 3 in the present embodiment includes a box body including a bottom plate 23, a cover plate 16, and side plates between the bottom plate 23 and the cover plate 16, the side plates including a left side plate 22, a right side plate, a front side plate 14, and a rear side plate 15. The cabinet 3 also includes a back panel 8 inside the rear side panel 15 and a top panel 25 below the cover panel 16. For the convenience of the assembly of the chassis 3, in this embodiment, the left side plate 22, the right side plate, the front side plate 14 and the rear side plate 15 are all fixed on the cover plate 16 by means of the snap connection, and the left side plate 22 and the right side plate are also respectively fixed to the front side plate 14 and the rear side plate 15 by means of the snap connection. As shown in fig. 3, a buckle 221 is fixed on the left side plate 22, a buckle hole 141 is formed on the front side plate 14, and the left side plate 22 and the front side plate 14 are fixedly connected by the buckle connection of the buckle 221 and the buckle hole 141, so that the case is convenient to assemble; in addition, when the control circuit board in the case is overhauled or replaced, the locking action of the buckle and the buckle hole on the corresponding side plate is only needed to be contacted, and the side plate of the case is convenient to detach. Moreover, all adopt the buckle to be connected between each adjacent curb plate, between curb plate and the apron, still reduced chassis body's connecting bolt quantity, and the assembly accuracy is high, and the installation is maintained conveniently. In other embodiments, the side plates and the cover plate can be fixedly connected by welding, bonding or bolts between the adjacent side plates.
As shown in fig. 2 to 4, the chassis 3 in this embodiment is fixed above the sub-module 1, and the bottom plate 23 of the chassis 3 is provided with a wire passing hole 24 for passing a wire electrically connected between the sub-module terminal and the back plate 8. On one hand, the sub-module 1 and the converter valve sub-module control loop unit are integrated on the case 3, the case 3 is only required to be fixedly connected with the control circuit board and the back plate, and then the case is fixed on the sub-module 1, and the converter valve sub-module assembly is convenient to fixedly connect; on the other hand, case 3 sets up and can shelter from the rainwater in submodule piece 1 top, prevents that submodule piece terminal of submodule piece 1 from being soaked by the rainwater, guarantees the normal work of submodule piece. In other embodiments, the chassis and the sub-modules may be fixed to the mounting frame, respectively; the case can also be fixed on the side surface of the sub-module; the wire through hole can also be arranged on a side plate or a cover plate of the case according to requirements.
As shown in fig. 6 and 7, in order to prevent rainwater from entering the chassis under special conditions and flowing to the sub-module terminals along the wires, which may cause safety accidents, an annular boss 19 is protruded upward at the wire passing hole 24 of the bottom plate 23 in this embodiment. The annular boss 19 is slightly higher than the bottom plate 23, so that rainwater entering the case 3 can be blocked at the periphery of the wire passing hole 24, and the rainwater is prevented from flowing to the sub-module terminal along the lead. In other embodiments, the annular boss may not be disposed at the wire passage hole. In order to prevent rainwater from flowing onto the sub-module 1 along the chassis 3, an annular convex edge 20 for shielding the sub-module 1 is convexly arranged below the bottom plate 23 in this embodiment, it should be noted that the size of the annular convex edge 20 is larger than the maximum external dimension of the sub-module, so that rainwater can be prevented from flowing onto the sub-module terminals of the sub-module 1 along the chassis 3 to affect the product performance. In other embodiments, the bottom plate may not have an annular ledge; a water guide structure for collecting and guiding out rainwater falling on the cover plate can be arranged on the cover plate of the case. Considering that water may damage electrical components in the case 3 when water leaks from the case 3, the bottom plate 23 of this embodiment is provided with the flow guide hole 21 located outside the annular convex edge 20 and used for guiding the water in the case 3 to the outside of the case 3, so that even if a water leakage accident occurs in the case 3, the probability of a safety accident caused by water leakage can be reduced. In other embodiments, the bottom plate may not be provided with the diversion holes; a diversion trench for guiding water out of the case can be arranged on the bottom plate.
As shown in fig. 5, the submodule 1 in the present embodiment includes two IGBTs 5 and three heat sinks 7, and the IGBTs 5 are arranged at intervals from the heat sinks 7. In consideration of the problem that the IGBT5 is deformed by force during operation, the sub-module 1 in this embodiment is provided with a sub-module sliding fit structure which is in sliding fit with the chassis 3 along the arrangement direction of the heat sink 7 and the IGBT 5. It should be noted that the sub-module 1 is further provided with a sub-module fixing structure fixedly connected to the chassis 3, and the chassis 3 is fixed to the sub-module 1 through the sub-module fixing structure. The sub-module fixing structure is arranged on one of the heat radiators 7 on the outer side of the sub-module 1, and the sub-module sliding fit structure is arranged on the other heat radiator 7 on the outer side of the sub-module 1. Even if IGBT atress warp like this, submodule piece 1 also can take place relative slip for quick-witted case 3, avoids quick-witted case 3 to be destroyed when IGBT warp, increases quick-witted case 3's life, and in addition, the arrangement of quick-witted case 3 and submodule piece 1's tie point is reasonable, guarantees that quick-witted case 3 is stable fixes on submodule piece 1. The sliding fit structure of the submodule in this embodiment is a sliding groove, the sliding groove is a dovetail groove 4, the case 3 is provided with a sliding rail 2 in sliding fit with the dovetail groove 4, and the dovetail groove 4 and the sliding rail 2 are in sliding fit to enable the submodule 1 and the case 3 to slide relatively more stably. In other embodiments, the sub-modules may not be provided with the sub-module sliding fit structure, and the chassis is directly and fixedly connected to the sub-modules; the sub-module sliding fit structure and the sub-module fixing structure can also be arranged on the same radiator of the sub-module or radiators at different other positions; the sub-module sliding fit structure can be a structure such as a hook which can slide relative to the sliding rail and can ensure the relative position of the sub-module and the case.
As shown in fig. 4 and 5, the chassis 3 in this embodiment is fixed to the sub-module 1 by the connecting member 6, the connecting member 6 has a heat sink connecting hole 61 corresponding to the sub-module mounting hole of the heat sink 7, and the connecting member 6 also has a chassis connecting hole 62 corresponding to the chassis mounting hole of the chassis 3. In this way, the case 3 is stably fixed to the heat sink 7 of the sub-module 1 by the connecting member 6, and the connecting member 6 is used not only as a case fixing structure for fixing the case 3 to the sub-module 1 but also as a sub-module fixing structure. The connecting piece 6 is simple in structure and facilitates the fixing, dismounting and mounting of the case 3 and the sub-module 1. In other embodiments, the case and the sub-modules may be respectively provided with a case fixing structure and a sub-module fixing structure, and the case and the sub-modules are fixedly connected through the fixing structures; the connecting piece can be fixedly connected with the case and the sub-modules by welding and bonding; the bottom plate of the case can also be directly and fixedly connected with the sub-modules. In order to facilitate the fixed connection between the case 3 and the sub-module 1, the connecting member 6 in this embodiment further has a first limiting portion in press fit with the bottom plate 23 and a second limiting portion in stop fit with the annular convex edge 20, the annular convex edge 20 and the second limiting portion are in stop fit along the sliding fit direction between the sub-module 1 and the case 3, and the case connecting hole 62 is disposed on the second limiting portion. When the case 3 is fixed on the sub-module 1, the slide rail 2 is aligned with the dovetail groove 4 to push the case 3 to slide, and when the second limiting portion of the connecting piece 6 is in stop fit with the annular convex edge 20, the case 3 slides to a set mounting position, and the case 3 is fixed on the sub-module 1 through bolts. In addition, the case connection hole 62 is formed in the second limiting portion, so that the case 3 and the sub-module 1 can be fixedly connected through bolts. It should be noted that, the number of the connecting members in this embodiment is two, and the two connecting structures are arranged along the front-back direction, so that the connection stability of the sub-module 1 and the chassis 3 is increased. In other embodiments, only the first position-limiting portion or the second position-limiting portion may be disposed on the connecting member; the case connection hole may be disposed on the first limiting portion.
As shown in fig. 7 and 8, in order to facilitate the fixed installation of each control circuit board, the SCE board 9, the low-voltage power board 10, and the IGBT driver 11 in this embodiment are vertically connected in the enclosure 3, the fuse board 12 and the high-voltage power board 13 are fixed on the top plate 25, the control circuit board is provided with a guide rail 18, and a guide rail groove slidably engaged with the guide rail 18 is provided in the enclosure 3. The control circuit board can be conveniently slid into the case 3 through the sliding fit of the guide rail groove and the guide rail 18. In addition, a backboard plug-in terminal 17 electrically connected with each control circuit board is arranged on the backboard 8, and a control circuit board plug-in terminal corresponding to the backboard plug-in terminal 17 is arranged on the control circuit board. After the control circuit board slides into the case 3 through the guide rail 18, the control circuit board is conductively connected with the back plate through the plugging terminal instead of adopting a bolt and other structures, so that the connection is convenient, the number of connecting pieces in the case 3 is correspondingly reduced, and the installation and maintenance of the converter valve sub-module assembly are more convenient. In other embodiments, the control circuit board and the chassis can be fixedly connected through bolts; the control circuit board and the back plate can also be in conductive connection through a conductive bus bar or a lead; each control circuit board can also be horizontally connected in the case or vertically connected in the case.
The specific implementation mode of the converter valve of the invention is as follows: 1) firstly, the slide rail 2 is installed on a bottom plate 23 of a case 3, then the dovetail groove 4 is installed on one radiator 7 of the submodule 1, and the connecting piece 6 is installed on the other radiator 7; 2) the back plate 8 is installed in the case 3, the SCE plate 9, the low-voltage power supply plate 10 and the IGBT drive 11 are all slid into the case 3 through the guide rail 18, and the back plate plug terminal 17 is electrically connected with the back plate 8; 3) the fuse board 12 and the high voltage power supply board 13 are fixed to the top of the case 3. 4) The adjacent side plates of the case 3, the side plates and the cover plate 16 are connected by a buckle 221 and a buckle hole 141; 5) the slide rail 2 is aligned with the dovetail groove 4 and is in sliding fit with the dovetail groove, the case 3 is integrally installed above the radiator 7 in a sliding mode, and when the connecting piece 6 slides to be in limiting fit with the case, the case 3 is fixedly connected with the connecting piece 6.
The converter valve of the invention has the following advantages: the control circuit board in the case is connected with the back plate through the plug terminal, so that the product connection is reliable, and the installation and maintenance are convenient. The machine case is internally provided with an annular boss which prevents water permeating into the machine case from flowing to the sub-module terminal below the machine case along the wire passing hole, the periphery of the bottom of the machine case is provided with a waterproof annular convex edge, the water permeating into the machine case can be rapidly distributed to the outside of the sub-module through the flow guide hole by matching with the flow guide hole on the outer side of the machine case, and the design structure can prevent the electric elements inside the machine case and the sub-module terminal on the bottom of the machine case from being influenced by water leakage. If water leakage occurs, water can directly flow to the sub-modules along the annular convex edges, the structure can avoid the sub-module terminals from being drenched to the greatest extent, and the use reliability of the product is improved.
In addition, three points at the bottom of the case are fixed, wherein two points at the same side are rigidly connected with the connecting piece through bolts, so that the stable fixation of the case is ensured; and in addition, the sliding fit installation of the case and the sub-modules is realized by adopting the sliding fit of the sliding rails and the dovetail grooves. Because the machine case is fixed through two radiators that the interval set up, when the IGBT of valve section received pressure and takes place deformation, the spout can produce relative displacement slip relative to the slide rail, and this kind of displacement slip can guarantee that quick-witted case body does not receive the stress failure of deformation. Meanwhile, the sliding groove is a dovetail groove, and axial limiting of the case above the radiator can be guaranteed. The power transmission system of the flexible direct current converter valve can operate reliably and stably.
The above specific embodiment 1 is an optimal implementation of the converter valve of the present invention, and the corresponding structure may be adjusted or simplified as needed, for example, the following implementation may be adopted:
in embodiment 2 of the converter valve of the present invention, the converter valve includes at least two converter valve submodule assemblies, each converter valve submodule assembly includes a submodule and a converter valve submodule control circuit unit for controlling the submodule, each converter valve submodule control circuit unit includes a case, a backplane and at least two control circuit boards conductively connected to the backplane for controlling the submodule are integrated in the case, and the backplane is conductively connected to submodule terminals of the submodule to control the submodule by each control circuit board. At least two control circuit boards are integrated in the same case, when the control circuit unit of the converter valve submodule is fixedly installed, the control circuit board integrated in the case is installed in the case and is in conductive connection with the back plate, and then the submodule terminals of the submodule are in conductive connection with the back plate; when the control circuit unit of the converter valve submodule needs to be maintained or parts need to be replaced, the case can be detached firstly, and then the control circuit board in the case is overhauled and replaced. Compared with the prior art, the control circuit board of the converter valve submodule control loop unit is integrated on the same case, so that the installation and maintenance are convenient, and the problem that the converter valve submodule component in the prior art is inconvenient to install and maintain is solved.
As a further optimization of embodiment 2 of the converter valve, embodiment 3 of the converter valve of the present invention provides a case fixed to a submodule for facilitating a fixed connection of a submodule assembly of the converter valve, and the case is provided with a wire passing hole through which a wire for electrically connecting a submodule terminal and a back plate passes. The case is fixed on the sub-modules, the sub-modules and the converter valve sub-module control loop units are integrated on the case, only the converter valve sub-module assemblies are fixedly connected inside and outside the case, and the converter valve sub-module assemblies are conveniently fixedly connected. In other embodiments, the chassis and the sub-modules may be fixed to the mounting brackets, respectively.
As a further optimization of embodiment 3 of the converter valve, embodiment 4 of the converter valve of the present invention is that, in order to prevent the sub-module terminals of the sub-module from being wetted by rainwater, in this embodiment, the case is fixed above the sub-module, and the wire passing holes are disposed on the bottom plate of the case. The bottom plate is located the submodule piece terminal top of submodule piece like this, can shelter from the rainwater, prevents that the submodule piece terminal of submodule piece from being soaked by the rainwater. In other embodiments, the chassis may be fixed to the side of the sub-module, and the wire holes may be provided in the side panels or the cover panel of the chassis.
As a further optimization of embodiment 4 of the converter valve of the present invention, embodiment 5 of the converter valve of the present invention is provided, in order to prevent rainwater entering the chassis from flowing onto the sub-module terminals along the wires, an annular boss is protruded upward at the wire passing hole of the bottom plate in this embodiment. The annular boss can block the rainwater at crossing the line hole periphery, avoids the rainwater to flow to submodule piece terminal along the wire, causes the incident. In other embodiments, the annular boss may not be disposed at the wire passage hole.
As a further optimization of embodiment 4 of the converter valve of the present invention, embodiment 6 of the converter valve of the present invention provides that, in order to prevent rainwater from flowing onto the sub-modules along the chassis, an annular convex edge for shielding the sub-modules is convexly provided below the bottom plate in this embodiment. The annular convex edge is shielded in the circumferential direction of the sub-module, so that rainwater can be effectively prevented from flowing to the sub-module along the case. In other embodiments, the bottom plate may not be provided with the annular convex edge, and the cover plate of the chassis may be provided with a water guide structure for collecting and guiding rainwater falling on the cover plate.
As a further optimization of embodiment 6 of the converter valve of the present invention, in order to prevent rainwater entering the chassis from remaining in the chassis and damaging electrical components in the chassis, in this embodiment, the bottom plate is provided with a flow guide hole located outside the annular convex edge and used for guiding water in the chassis to the outside of the chassis. Therefore, rainwater entering the case can flow out of the case through the diversion holes. In other embodiments, the bottom plate may not be provided with the diversion holes; a diversion trench for guiding water out of the case can be arranged on the bottom plate.
As a further optimization of any one of the embodiments 3 to 7 of the converter valve of the present invention, in consideration of the problem of stress deformation during the operation of the IGBT, the specific embodiment 8 of the converter valve of the present invention provides a sub-module sliding fit structure, which is slidably fitted with the chassis along the arrangement direction of the heat sink and the IGBT of the sub-module, on the sub-module in this embodiment. Therefore, the case can be prevented from being damaged when the IGBT deforms, and the service life of the case is prolonged. In other embodiments, the sub-module may not be provided with a sliding fit structure, and the chassis is directly and fixedly connected to the sub-module.
As a further optimization of embodiment 8 of the converter valve of the present invention, in order to facilitate the fixed connection between the chassis and the sub-module, in this embodiment, the chassis is fixed to the sub-module by a connecting member, the connecting member has a first limiting portion in press fit with the bottom plate and a second limiting portion in stop fit with the annular convex edge, the annular convex edge and the second limiting portion are in stop fit with each other along the direction of arrangement of the heat sink and the IGBT of the sub-module, and the first limiting portion or the second limiting portion is fixedly connected to the chassis. The vertical limiting part of the connecting piece is matched with the annular convex edge stop to conveniently judge whether the case slides in place. In other embodiments, only the first position-limiting portion or only the second position-limiting portion may be disposed on the connecting member.
As a further optimization of embodiment 8 of the converter valve of the present invention, in this embodiment, in order to ensure that the case is stably fixed to the sub-module, one end of the sub-module is provided with a sub-module fixing structure fixedly connected to the case so as to fix the case to the sub-module, and the sub-module sliding fit structure is disposed at the other end of the sub-module. Therefore, the arrangement of the connection points of the case and the sub-modules is more reasonable, and the case is stably fixed on the sub-modules. In other embodiments, the sub-module sliding fit structure and the sub-module fixing structure may be both disposed on the same heat sink of the sub-module.
As a further optimization of the converter valve in embodiment 8 of the present invention, in embodiment 11 of the present invention, a sliding groove is disposed on the sub-module, a sliding rail for sliding fit with the sliding groove is disposed on the chassis, and the sliding groove forms the sub-module sliding fit structure. Through the sliding fit of the sliding rail and the sliding groove with larger contact area, the stability during sliding is improved. In other embodiments, the sub-module sliding fit structure may be a hook or other structure that can slide relative to the slide rail.
As a further optimization of any of embodiments 4 to 7 of the converter valve of the present invention, embodiment 12 of the converter valve of the present invention provides that, in order to facilitate the arrangement of the conductive wires for electrically connecting the sub-module terminals and the control circuit boards, at least one of the control circuit boards is vertically arranged inside the chassis. Therefore, the wire passing holes can be formed in the control circuit board which is vertically arranged, the number of the wires which need to pass through the control circuit board can be reduced, and the arrangement of the wires is convenient. In other embodiments, each control circuit board may be horizontally fixed within the chassis.
As a further optimization of any one of the embodiments 2 to 7 of the converter valve, the embodiment 13 of the converter valve of the present invention is that, in order to facilitate the assembly of the chassis, the adjacent side plates and the cover plate of the chassis in this embodiment are connected by fasteners. In other embodiments, the adjacent side plates, the side plates and the cover plate can be fixed by welding, bonding or bolting.
In the specific embodiment of the converter valve sub-module assembly according to the present invention, the structure of the converter valve sub-module assembly in this embodiment is the same as that of any one of the converter valve sub-module assemblies described in the specific embodiments 1 to 13 of the converter valve, and thus, description thereof is omitted.
In the specific embodiment of the converter valve sub-module control circuit unit according to the present invention, the structure of the converter valve sub-module control circuit unit in this embodiment is the same as that of any one of the converter valve sub-module control circuit units described in the above specific embodiments 1 to 13 of the converter valve, and details are not repeated.
Claims (6)
1. The converter valve submodule component is characterized by comprising a submodule and a converter valve submodule control circuit unit used for controlling the submodule, wherein the converter valve submodule control circuit unit comprises a case, a back plate and at least two control circuit boards which are electrically connected with the back plate and used for controlling the submodule are integrated in the case, the back plate is electrically connected with submodule terminals of the submodule to realize the control of each control circuit board on the submodule, a submodule sliding fit structure which is in sliding fit with the case along the arrangement direction of a radiator and an IGBT of the submodule is arranged on the submodule, one end of the submodule is provided with a submodule fixing structure which is fixedly connected with the case to fix the case on the submodule, the submodule sliding fit structure is arranged at the other end of the submodule, the case is fixed on the submodule, and a wire passing hole through which a lead wire electrically connected with the back plate by the submodule terminals, the case is fixed above the sub-modules, the wire passing hole is arranged on a bottom plate of the case, an annular boss is convexly arranged at the wire passing hole of the bottom plate, an annular convex edge used for shielding the sub-modules is convexly arranged below the bottom plate, a flow guide hole which is arranged outside the annular convex edge and used for guiding water in the case to the outside of the case is arranged on the bottom plate, the case is fixed on the sub-modules through a connecting piece, the connecting piece is provided with a first limiting part which is in jacking fit with the bottom plate and a second limiting part which is in stop fit with the annular convex edge, the annular convex edge and the second limiting part are in stop fit with the IGBT arrangement direction along a radiator of the sub-modules, the first limiting part or the second limiting part is fixedly connected with the case, the sub-modules are provided with sliding grooves, the case is provided with sliding rails which are in sliding fit with the sliding grooves, the sliding grooves, when the case is fixed on the sub-module, the slide rail is aligned with the dovetail groove to push the case to slide, and when the second limiting part of the connecting piece is matched with the annular convex edge stop, the case slides to a set installation position, and the case is fixed on the sub-module through the bolt.
2. The converter valve sub-module assembly of claim 1, wherein the at least one control circuit board is vertically disposed within the housing.
3. The converter valve sub-module assembly of claim 1, wherein adjacent side plates of the case and the side plates and the cover plate are connected by a snap fit.
4. The converter valve is characterized by comprising at least two converter valve submodule assemblies, wherein each converter valve submodule assembly comprises a submodule and a converter valve submodule control loop unit used for controlling the submodule, each converter valve submodule control loop unit comprises a case, a back plate and at least two control circuit boards which are in conductive connection with the back plate and used for controlling the submodule are integrated in the case, the back plate is in conductive connection with submodule terminals of the submodule to realize the control of each control circuit board to the submodule, a submodule sliding fit structure which is in sliding fit with the case along the arrangement direction of a radiator and an IGBT of the submodule is arranged on the submodule, one end of the submodule is provided with a submodule fixing structure which is fixedly connected with the case to fix the case on the submodule, the submodule sliding fit structure is arranged at the other end of the submodule, and the case is fixed on the submodule, the case is provided with a wire passing hole for a lead electrically connected with a terminal of the sub-module and a back plate to pass through, the case is fixed above the sub-module, the wire passing hole is arranged on a bottom plate of the case, the wire passing hole of the bottom plate is upwards convexly provided with an annular boss, an annular convex edge for shielding the sub-module is convexly arranged below the bottom plate, the bottom plate is provided with a flow guide hole which is positioned outside the annular convex edge and is used for guiding water in the case to the outside of the case, the case is fixed on the sub-module through a connecting piece, the connecting piece is provided with a first limiting part in abutting fit with the bottom plate and a second limiting part in stop fit with the annular convex edge, the annular convex edge and the second limiting part are in stop fit along the radiator of the sub-module and the IGBT arrangement direction, the first limiting part or the second limiting part is fixedly connected with the case, the sub-module is, the sliding grooves form the sliding fit structure of the sub-module, the sliding grooves are dovetail grooves, when the case is fixed on the sub-module, the sliding rails are aligned with the dovetail grooves to push the case to slide, when the second limiting part of the connecting piece is matched with the stop of the annular convex edge, the case slides to a set installation position, and the case is fixed on the sub-module through bolts.
5. The converter valve of claim 4 wherein the at least one control circuit board is vertically disposed within the housing.
6. The converter valve of claim 4, wherein the adjacent side plates and the cover plate of the housing are connected by a snap fit.
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| CN201810758661.9A CN109038632B (en) | 2018-07-11 | 2018-07-11 | Converter valve submodule control loop unit, converter valve submodule assembly and converter valve |
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| CN201810758661.9A CN109038632B (en) | 2018-07-11 | 2018-07-11 | Converter valve submodule control loop unit, converter valve submodule assembly and converter valve |
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