CN107017785B - Solid-state transformer - Google Patents
Solid-state transformer Download PDFInfo
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- CN107017785B CN107017785B CN201610059576.4A CN201610059576A CN107017785B CN 107017785 B CN107017785 B CN 107017785B CN 201610059576 A CN201610059576 A CN 201610059576A CN 107017785 B CN107017785 B CN 107017785B
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- copper bar
- voltage module
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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
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
- H01F27/292—Surface mounted devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Patch Boards (AREA)
Abstract
The invention provides a solid-state transformer which comprises a plurality of power units, wherein each power unit comprises a low-voltage module, a high-frequency isolation transformer, a high-voltage module and an opposite insertion assembly, the opposite insertion assembly is fixed on a cabinet back plate, the input end of the low-voltage module is connected with the direct current input outside the power unit, the output end of the low-voltage module is connected with the input end of the high-frequency isolation transformer, the output end of the high-frequency isolation transformer is inserted into one side of the opposite insertion assembly, the input end of the high-voltage module is inserted into the other side of the opposite insertion assembly, the output end of the high-voltage module is connected with the alternating current output outside the power unit, and the opposite insertion assembly can enable the output end of the high. The solid-state transformer has the advantages of compact structure and good maintainability, and is suitable for industrial application.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a solid-state transformer.
Background
With the rise and development of the energy internet, the modern power system is undergoing a profound change, and the traditional power system can not meet the demand. As a novel power device, the solid-state transformer can combine a power electronic conversion technology with a high-frequency electric energy conversion technology based on an electromagnetic induction principle, and convert electric energy with one electric characteristic into electric energy with another electric characteristic. Therefore, the solid-state transformer is used as a specific implementation device for the operation and control of the energy internet and becomes the core of the energy internet.
However, the research on solid-state transformers at home and abroad is still in the laboratory prototype stage at present, and the industrial requirements cannot be met. Moreover, laboratory prototypes suffer from the following disadvantages:
1. the laboratory prototype generally takes the realization of control function as the main part, does not adopt standardized design, and has incompact structure and large volume;
2. the laboratory prototype has less requirements on the reliability of the device, and the wiring mode does not meet the relevant industrial standards and is not suitable for industrial application;
3. the maintainability of a laboratory prototype is poor, the requirements on quick installation, disassembly and quick maintenance are not strict, and the laboratory prototype cannot be accepted by the market.
Therefore, it is an urgent technical problem to design a solid-state transformer which has a compact structure and good maintainability and is suitable for industrial application.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a solid-state transformer which has a compact structure and good maintainability and is suitable for industrial application, aiming at the above-mentioned defects in the prior art.
The technical scheme adopted for solving the technical problem of the invention is as follows:
the invention provides a solid-state transformer which comprises a plurality of power units, wherein each power unit comprises a low-voltage module, a high-frequency isolation transformer, a high-voltage module and an opposite insertion assembly, the opposite insertion assembly is fixed on a cabinet back plate, the input end of the low-voltage module is connected with the direct current input outside the power unit, the output end of the low-voltage module is connected with the input end of the high-frequency isolation transformer, the output end of the high-frequency isolation transformer is inserted into one side of the opposite insertion assembly, the input end of the high-voltage module is inserted into the other side of the opposite insertion assembly, the output end of the high-voltage module is connected with the alternating current output outside the power unit, and the opposite insertion assembly can enable the output end of the high.
Preferably, the low-voltage module interior and the high-voltage module interior both adopt a stacked structure.
Preferably, the low voltage module comprises a first frame, and the following components arranged inside the first frame:
the power unit comprises a first metal substrate, a first control single board arranged on one side of the first metal substrate, a first energy-taking power supply arranged on the other side of the first metal substrate, a second metal substrate, a first power single board arranged on one side of the second metal substrate, and a first incoming copper bar connected with the input end of the first power single board, wherein the first incoming copper bar is connected with a direct current input outside the power unit, and the output end of the first power single board is connected with the input end of the high-frequency isolation transformer;
the high-frequency isolation transformer is fixed inside the first frame.
Preferably, the first power single plate is fixed on one side of the second metal substrate through a plurality of hexagonal isolation columns;
the low-voltage module further comprises a first insulating plate, a second insulating plate and a first air channel mounting plate which are arranged inside the first frame, the first insulating plate is fixed on the side face inside the first frame, the second insulating plate and the first air channel mounting plate are both arranged between the first power single plate and the second metal base plate, the second insulating plate is fixed on the second metal base plate and is perpendicular to and vertical to the first insulating plate, the first air channel mounting plate is of a U-shaped structure, the opening of the first air channel mounting plate faces the second insulating plate and is fixed between the first insulating plate and the second insulating plate, and a first radiator is arranged in the first air channel mounting plate;
and a through hole is formed in the first air duct mounting plate at a position corresponding to the first radiator, and the heating device of the first power single plate penetrates through the through hole and is fixed on the first radiator.
Preferably, the low-voltage module is still including setting up in the inside bent angle piece of first frame, first inlet wire copper bar and bent angle piece all adopt L shape structure and parallel arrangement, the outside direct current input of power unit is connected to a lateral wall of first inlet wire copper bar, another lateral wall of first inlet wire copper bar passes in proper order in the first frame side and first insulation board and with a lateral wall fixed connection of bent angle piece, and another lateral wall of bent angle piece is fixed on first insulation board, another lateral wall of first inlet wire copper bar still is connected with the input of first power veneer.
Preferably, the high voltage module comprises a second frame, and the following components arranged inside the second frame:
a third metal substrate, a second power single board, a third power single board, a second control single board and a second energy-taking power supply which are arranged on one side of the third metal substrate, a second incoming line copper bar connected with the input end of the third power single board, an alternating current filter inductor and a capacitor board which are arranged on the other side of the third metal substrate, and an outgoing line copper bar connected with the output end of the alternating current filter inductor,
and the second incoming copper bar is respectively connected with the output end of the high-frequency isolation transformer and the input end of a third power single plate, the output end of the third power single plate and the input end of the second power single plate are both connected with the capacitor plate, the output end of the second power single plate is connected with the input end of the alternating current filter inductor, the output end of the alternating current filter inductor is connected with an outgoing copper bar, and the outgoing copper bar is also connected with the alternating current output outside the power unit.
Preferably, the high voltage module further includes a third insulating plate and a fourth insulating plate respectively fixed to the inner sides of the second frame,
the second incoming line copper bar sequentially penetrates through the side face in the second frame and the fourth insulating plate and is fixed on the second frame, one end, located outside the second frame, of the second incoming line copper bar is connected with the output end of the high-frequency isolation transformer, and one end, located in the second frame, of the second incoming line copper bar is connected with the input end of the third power single plate;
the outgoing line copper bar sequentially penetrates through the side face and the third insulating plate in the second frame and is fixed on the second frame, one end, located in the second frame, of the outgoing line copper bar is connected with the output end of the alternating current filter inductor, and one end, located outside the second frame, of the outgoing line copper bar is connected with alternating current output outside the power unit.
Preferably, the second power single board, the third power single board and the second control single board are respectively fixed on one side of the third metal substrate through a plurality of hexagonal isolation columns;
the high-voltage module also comprises a second air duct mounting plate which is arranged in the second frame and is positioned between the second power single plate and the third metal substrate, and a third air duct mounting plate which is positioned between the third power single plate and the third metal substrate, wherein the second air duct mounting plate and the third air duct mounting plate both adopt U-shaped structures, the openings of the second air duct mounting plate and the third air duct mounting plate face the third metal substrate and are fixed on the third metal substrate, a second radiator is arranged in the second air duct mounting plate, and a third radiator is arranged in the third air duct mounting plate;
a through hole is formed in the second air duct mounting plate at a position corresponding to the second radiator, and the heating device of the second power single plate penetrates through the through hole and is fixed on the second radiator; and a through hole is formed in the third air duct mounting plate at a position corresponding to the third radiator, and the heating device of the third power single plate penetrates through the through hole and is fixed on the third radiator.
Preferably, the high voltage module further includes a first laminated busbar and a second laminated busbar arranged inside the second frame, a first hole is formed in a position of the third metal substrate corresponding to the second power board, a second hole is formed in a position of the third metal substrate corresponding to the third power board, the first laminated busbar penetrates through the first hole, two ends of the first laminated busbar are respectively connected with the second power board and the capacitor plate, and the second laminated busbar penetrates through the second hole, two ends of the second laminated busbar are respectively connected with the third power board and the capacitor plate.
Preferably, the high-frequency isolation transformer is of a horizontal structure, the output end of the high-frequency isolation transformer is a copper bar outgoing line, the input end of the high-frequency isolation transformer is a high-voltage line outgoing line, an umbrella skirt is arranged around the copper bar, and the umbrella skirt is made of insulating materials.
Has the advantages that:
the solid-state transformer adopts a modularization technology, the whole solid-state transformer is divided into a plurality of independent power units, the modularization technology is a key technology for realizing marketization of the solid-state transformer, the solid-state transformer is compact in structure, the solid-state transformer is suitable for industrial application, and the reliability and maintainability of the solid-state transformer can be improved; and, the high frequency isolation transformer that is connected with the low pressure module is connected through inserting the subassembly with high pressure between the module, adopts inserting formula structural connection between the two promptly, so installation and dismantlement all are very convenient, swift, have correspondingly reduced assembly work volume.
Drawings
Fig. 1 is a front view of a power unit provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a low-voltage module and a high-frequency isolation transformer according to an embodiment of the present invention;
fig. 3 is a second schematic structural diagram of a low voltage module and a high frequency isolation transformer according to an embodiment of the invention;
fig. 4 is a third schematic structural diagram of a low-voltage module and a high-frequency isolation transformer according to an embodiment of the present invention;
fig. 5 is a schematic partial structural diagram of a low-voltage module according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a high-frequency isolation transformer according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an interposer assembly according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a high voltage module according to an embodiment of the present invention;
fig. 9 is a second schematic structural diagram of a high voltage module according to an embodiment of the present invention; and
fig. 10 is a third schematic structural diagram of a high voltage module according to an embodiment of the present invention.
In the figure: 1-a low-voltage module; 2-plug-in components; 3-cabinet back plate; 4-a high voltage module; 5-a first frame; 6-a first power single board; 7-high frequency isolation transformer; 8-a first control single board; 9-a first heat sink; 10-a first energy-taking power supply; 11-a first base plate; 12. 22, 31-hexagonal isolation columns; 13-a first metal substrate; 14-a first left side panel; 15-a first incoming copper bar; 16-corner pieces; 17-a first insulating plate; 18-a first duct mounting plate; 19-a first top panel; 20-a second insulating plate; 21-a second metal substrate; 23-a column; 24-a carrier plate; 25-a mounting; 26-power terminals; 27-a second frame; 271-a second top panel; 272-a second left side panel; 273-a second floor; 28-right side plate; 29-a second control single board; 30-a second energy-taking power supply; 32-a third metal substrate; 33-a second power board; 34-a third power single board; 35-ac filter inductance; 36-a third insulating plate; 37-a line outlet copper bar; 38-capacitive plates; 39-a first laminated busbar; 40-a second heat sink; 41-a second air duct mounting plate; 42-a third duct mounting plate; 43-a third heat sink; 44-a second incoming copper bar; 45-a second laminated busbar; 46-a fourth insulating plate.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention is further described in detail below with reference to the accompanying drawings and examples.
It should be understood that in embodiments of the present invention, the terms "upper", "lower", "left" and "right" refer to the "upper", "lower", "left" and "right" directions, respectively, as indicated in the drawings.
The embodiment of the invention provides an energy internet-oriented solid-state transformer which comprises a cabinet and a plurality of power units arranged in the cabinet, wherein the power units are arranged in the cabinet according to a preset sequence.
As shown in fig. 1, each power cell includes a low voltage module 1, a high frequency isolation transformer 7, a high voltage module 4 and a plug-in assembly 2, the input end of the low-voltage module 1 is connected with the direct current input outside the power unit, the output end of the low-voltage module 1 is connected with the input end (low-voltage side) of the high-frequency isolation transformer 7, the output end (high-voltage side) of the high-frequency isolation transformer 7 is inserted into one side of the plug-in component 2, the input end of the high-voltage module 4 is inserted into the other side of the plug-in component 2, the output end of the high-voltage module 4 is connected with the alternating current output outside the, the opposite plug component 2 can lead the output end of the high-frequency isolation transformer 7 to be conducted with the input end of the high-voltage module 4, when the output end of the high-frequency isolation transformer 7 and the input end of the high-voltage module 4 are completely inserted into the plug-in component 2, the low-voltage module 1 is completely conducted with the high-voltage module 4 through the high-frequency isolation transformer 7; when the high-frequency isolation transformer 7 and/or the high-voltage module 4 need to be overhauled or maintained, the high-frequency isolation transformer and/or the high-voltage module are/is only required to be pulled out of the plug-in component 2.
The low-voltage module 1 and the high-frequency isolation transformer 7 are fixed together, and the high-frequency isolation transformer 7 has the function of isolating high-level voltage; the opposite-insertion component 2 of each power unit is provided with a preset position in the cabinet and is fixed on the cabinet back plate 3 at the preset position, so that after the output end of the high-frequency isolation transformer 7 of each power unit and the input end of the high-voltage module 4 of each power unit are respectively inserted into two sides of the opposite-insertion component, the power units are arranged in the cabinet according to a preset sequence, and a solid-state transformer with a multi-power-unit integrated opposite-insertion structure is further formed, and the solid-state transformer is compact in structure, reasonable in electric component layout, simple in overall structure and suitable for industrial application; moreover, the power units in the cabinet are independent from each other, and the wiring is simple, so that the reliability and maintainability of the solid-state transformer are correspondingly improved; in addition, every power unit all is through on inserting formula structure is fixed in the rack backplate to, easily installation and dismantlement have greatly reduced assembly work volume, also make complete machine simple structure, easily look for the fault point, easily overhaul.
Preferably, each of the opposite plug assemblies 2 includes a guide rail (not shown) fixed in the cabinet and corresponding to a predetermined position thereof, so that the high frequency isolation transformer 7 and the high voltage module 4 of each power unit can be respectively inserted into both sides of the opposite plug assembly 2 along the guide rail for assembly.
In the present embodiment, welding, screwing or riveting connection methods may be adopted between the components or between the components in the same component, and those skilled in the art may select an appropriate connection method according to actual situations.
The specific structures of the low voltage module 1, the high frequency isolation transformer 7, the plug-in assembly 2, and the high voltage module 4 are described below, respectively.
As shown in fig. 2-5, the interior of the low voltage module 1 is of a stacked configuration.
The low-voltage module 1 comprises a first frame 5, and the following components arranged inside the first frame 5: the power supply comprises a first metal substrate 13, a first control single plate 8 arranged on one side of the first metal substrate, a first energy-taking power supply 10 arranged on the other side of the first metal substrate, a second metal substrate 21, a first power single plate 6 arranged on one side of the second metal substrate, and a first incoming copper bar 15 connected with the input end of the first power single plate 6 (one part of the first incoming copper bar is positioned inside the first frame 5, and the other part of the first incoming copper bar is positioned outside the first frame 5 so as to facilitate wiring), wherein the first incoming copper bar 15 is also connected with a direct current input outside a power unit, and the output end of the first power single plate 6 is connected with the input end (low-voltage side) of a high-frequency isolation transformer 7; the high frequency isolation transformer 7 is fixed inside the first frame 5 so as to be fixed with the low voltage module 1. The first power single board 6 is used for converting electric energy input by direct current into alternating current with high frequency; the first control single board 8 is used for intelligently controlling the first power single board 6 to normally perform electric energy conversion; the first energy-obtaining power source 10 is used for obtaining electricity from electric energy input by direct current and supplying power to the first control single board 8 as a power source.
In this embodiment, the vertically arranged second metal substrate 21 and the first power board 6 are both located at the upper portion in the first frame 5, the vertically arranged first metal substrate 13, the first control board 8 and the first energy obtaining power source 10 are all located at the lower left portion in the first frame 5, and the high-frequency isolation transformer 7 is located at the lower right portion in the first frame 5.
Specifically, as shown in fig. 5, the first frame 5 includes a first top plate 19, a first left side plate 14, a first bottom plate 11, a carrier plate 24, and two uprights 23. The first top plate 19 and the first bottom plate 11 are oppositely arranged, and the first left side plate 14 and the two upright posts 23 are oppositely arranged between the first top plate 19 and the first bottom plate 11 and respectively connected with the left end and the right end of the first top plate 19 and the first bottom plate 11 for supporting. Of course, in order to facilitate assembling the other components of the low-voltage module 1, the two vertical columns 23 are vertically arranged and spaced as far as possible, in other words, the connection point of each vertical column 23 with the first top plate 19 and the first bottom plate 11 is located at the vertex edge of the first top plate 19 and the first bottom plate 11. All edges of the first top plate 19 are bent downwards, and all edges of the first bottom plate 11 are bent upwards so as to be fixed with the first left side plate 14 and the two upright posts 23; the bearing plate 24 is used for fixing the high-frequency isolation transformer 7, at least two opposite edges of the bearing plate are bent downwards, the width of the bearing plate is equal to the width of the first bottom plate 11, the length of the bearing plate is smaller than the length of the first bottom plate 11, and the bearing plate is fixed on the right side of the first bottom plate 11 (which is equivalent to that the 'back-off' is arranged on the right side of the first bottom plate 11). The first frame 5 is preferably made of sheet metal materials, is easy to process in batches, and is simple to process and low in cost. In this embodiment, the first frame 5 is arranged reasonably, so that the overall size of the power unit is reduced, and the overall power density of the power unit is improved.
In this embodiment, the left end of the first metal substrate 13 is connected to the first left side plate 14, and the bottom end is connected to the first bottom plate 11; the first control single board 8 is fixed on one side of the first metal substrate 13 through a plurality of hexagonal isolation pillars 12 (in this embodiment, four hexagonal isolation pillars are used), so as to be fixed on the first metal substrate 13; the left end of the second metal base plate 21 is connected with the first left side plate 14, and the top end is connected with the first top plate 19; the first power board 6 is fixed to one side of the second metal substrate 21 through a plurality of hexagonal spacers 22 (four hexagonal spacers are used in this embodiment), so as to be fixed to the second metal substrate 21.
As shown in fig. 5, the low voltage module 1 further includes a first insulating plate 17, a second insulating plate 20, and a first duct mounting plate 18 disposed inside the first frame 5. The first insulating plate 17 is fixed on the first left side plate 14 of the first frame 5, and the two are arranged in parallel, the second insulating plate 20 and the first air duct mounting plate 18 are both arranged between the first power single plate 6 and the second metal base plate 21, and the second insulating plate 20 is fixed on the second metal base plate 21 (the two are arranged in parallel), and is perpendicular to and vertical to the first insulating plate 17, the first air duct mounting plate 18 adopts a U-shaped structure, the opening of the first air duct mounting plate is towards the second insulating plate 20, and is respectively connected with the first insulating plate 17 and the second insulating plate 20, and is fixed between the first insulating plate 17 and the second insulating plate 20; air inlets are formed in the positions, corresponding to the first air duct mounting plate 18, of the first left side plate 14 and the first insulating plate 17 so as to facilitate ventilation and heat dissipation; a first heat sink 9 (as shown in fig. 3) is disposed in the first air duct mounting plate 18, a through hole (a square through hole in this embodiment) is disposed at a position of the first air duct mounting plate 18 corresponding to the first heat sink 9, and the heating device of the first power board 6 passes through the through hole and is fixed on the first heat sink 9. In this embodiment, the first insulating plate 17 and the second insulating plate 20 are used to prevent the heating device of the first power board 6 from being broken down to charge the first heat sink 9 and the first air duct mounting plate 18, so as to prevent the first frame 5 from being charged, thereby improving the safety level.
As shown in fig. 5, the low voltage module 1 further includes a corner piece 16 disposed inside the first frame 5, the first incoming line copper bar 15 and the corner piece 16 both adopt an L-shaped structure and are disposed in parallel, where the parallel disposition of the first incoming line copper bar 15 and the corner piece 16 means that one side wall of the first incoming line copper bar 15 and one side wall of the corner piece 16 are disposed in parallel and the extending directions of the two are the same, and the other side wall of the first incoming line copper bar 15 and the other side wall of the corner piece 16 are disposed in parallel and the extending directions of the two are the same. One side wall of the first incoming line copper bar 15 is connected with a direct current input outside the power unit, the other side wall of the first incoming line copper bar 15 sequentially passes through the first left side plate 14 and the first insulating plate 17 of the first frame 5 and is fixedly connected with one side wall of the corner piece 16, and the other side wall of the corner piece 16 is fixed on the first insulating plate 17, in this embodiment, the corner piece 16 plays a role in fixing the first incoming line copper bar 15 on the first left side plate 14; the other side wall of the first incoming copper bar 15 is slightly longer than one side wall of the corner piece 16 connected to the other side wall in the extending direction, a through hole is provided on the slightly longer part, and the first incoming copper bar 15 is connected to the input end of the first power single board 6 through the through hole interconnection. In this embodiment, two first incoming copper bars 15 are used, and correspondingly, two corner pieces 16 are also used; the first energy taking power supply 10 respectively takes electricity from the two first inlet wire copper bars 15.
Preferably, the first power board 6 is a separated device packaged by a TO-247 package, and the rectifier in the first power board 6 with such a structure is designed in a single board mode, so that the size of the power unit is reduced.
It should be noted that fig. 2, fig. 3, and fig. 5 are all perspective views, fig. 4 is a rear view, fig. 3 hides the first power board 6 and the first control board 8 from fig. 2, and fig. 5 hides the first power board 6, the first control board 8, and the high-frequency isolation transformer 7 from fig. 2.
The high frequency isolation transformer 7 is used to isolate the low voltage module 1 from the high voltage module 4, and is fixed on the bearing plate 24 of the first frame 5. As shown in fig. 6, in the present embodiment, the high-frequency isolation transformer 7 is of a horizontal structure, i.e., a side face is used for outgoing lines, the high-voltage side output end ab of the high-frequency isolation transformer is used for outgoing lines, and an umbrella skirt is arranged around the copper bar, so that the high-voltage side outgoing lines of the high-frequency isolation transformer are of an umbrella skirt structure, thereby increasing a creepage distance, reducing a distance from the low-voltage module 1 to the high-voltage module 4, further reducing an overall size of the power unit, and improving a power density of the power unit, wherein the umbrella skirt is made of an insulating material, and the creepage distance from the copper bar to the body of the high; the low-voltage side input terminal AB of the high-frequency isolation transformer 7 adopts a high-voltage wire to be led out, and the design has the advantage that no matter how long the low-voltage side input terminal AB is led out, the creepage distance of the leading-out terminal of the high-voltage side input terminal AB is larger than 300mm when the copper bar of the high-voltage side output terminal AB meets the requirement. In addition, the high-frequency isolation transformer 7 adopting a horizontal structure can effectively reduce the height of the whole power unit, and compared with the top outgoing line, the high-frequency isolation transformer adopting the side outgoing line can avoid the problem that enough electric clearance is required to be kept between the high-frequency isolation transformer and the low-voltage module 1 when the top outgoing line is adopted, so that the layout of the power unit is more compact. During installation, the high-voltage side copper bar of the high-frequency isolation transformer 7 is directly inserted into one side of the plug-in component 2 along the guide rail.
The plug-in component 2 can adopt the existing structure, and only the requirement that the output end of the high-frequency isolation transformer 7 and the input end of the high-voltage module 4 can be conducted after being respectively plugged along the guide rails is met. In this embodiment, as shown in fig. 7, the opposite plug component 2 includes two guide rails (not shown in the figure), an installation part 25 and two power terminals 26, two power terminals 26 are all disposed within the installation part 25, and two ends of each power terminal 26 are all extended from the left and right sides of the installation part 25, the two guide rails are respectively disposed on the two sides of the installation part 25, the installation part 25 is fixed on the cabinet back plate 3, then the power terminals 26 are fixed on the cabinet back plate 3 through the installation part 25, during installation, the output end of the high-frequency isolation transformer 7 and the input end of the high-voltage module 4 are respectively inserted along the two guide rails, thereby respectively contacting with the left and right two ends of the two power terminals 26 and conducting, during disassembly, only the high-frequency isolation transformer 7 and the high-voltage module 4 which are fixedly connected with the low-voltage module 1.
As shown in fig. 8-10, the interior of the high voltage module 4 also adopts a stacked configuration.
The high voltage module 4 comprises a second frame 27, and the following components arranged inside the second frame 27: a third metal substrate 32, a second power single board 33, a third power single board 34, a second control single board 29 and a second energy-obtaining power supply 30 which are arranged on one side of the third metal substrate, a second incoming copper bar 44 (a part of which is arranged inside the second frame 27 and the other part is arranged outside the second frame 27 for convenient wiring) connected with the input end of the third power single board 34, an alternating current filter inductor 35 and a capacitor board 38 which are arranged on the other side of the third metal substrate, and an outgoing copper bar 37 (a part of which is arranged inside the second frame 27 and the other part is arranged outside the second frame 27 for convenient wiring) connected with the output end of the alternating current filter inductor 35, wherein two ends of the second incoming copper bar 44 are respectively connected with the output end (high-voltage side) of the high-frequency isolation transformer 7 and the input end of the third power single board 34, the output end of the third power single board 34 and the input end of the second power single board 33 are both connected with the, the output end of the second power single board 33 is connected to the input end of the ac filter inductor 35, the output end of the ac filter inductor 35 is connected to the outgoing line copper bar 37, and the outgoing line copper bar 37 is further connected to the ac output outside the power unit. In this embodiment, two second incoming copper bars 44 are adopted, and two outgoing copper bars 37 are also adopted. When the whole machine is installed, when the high-voltage side output copper bar of the high-frequency isolation transformer 7 is inserted into one side of the plug-in component 2 and the second inlet copper bar 44 of the high-voltage module 4 is inserted into the other side of the plug-in component 2, the low-voltage module 1 is conducted with the high-voltage module 4 through the high-frequency isolation transformer 7.
The second power single board 33 is used for converting the direct current into power frequency alternating current, so that the requirement of a power grid can be met; the third power single board 34 is used for converting the high-frequency alternating current into direct current; the second control board 29 is used for intelligently controlling the second power board 33 and the third power board 34 respectively, so that the second power board and the third power board can work normally; the capacitor plate 38 is used for storing the direct current energy, so that the direct current energy is stable and has small fluctuation; the second energy-obtaining power supply 30 is used for obtaining electricity from the direct-current electric energy of the capacitor plate 38 and supplying power to the second control single plate 29 as a power supply; the ac filter inductor 35 functions to filter out the ripple of the power frequency output ac power.
In this embodiment, the third metal substrate 32, the second power board 33, the third power board 34, the second control board 29, the second energy obtaining power supply 30, the ac filter inductor 35, and the capacitor plate 38 are all vertically disposed. Moreover, for one side of the third metal substrate 32, the second power board 33 is located at the upper left portion in the second frame 27, the second power board 34 is located at the lower left portion in the second frame 27, and both the second control board 29 and the second energy-obtaining power supply 30 are located at the right portion in the second frame 27; for the other side of the third metal substrate 32, the ac filter inductor 35 is located at the upper right part in the second frame 27, and the capacitor plate 38 is located at the left part in the second frame 27; the second incoming copper bar 44 is disposed adjacent to the third duct mounting plate 42, and the outgoing copper bar 37 is disposed adjacent to the ac filter inductor 35.
Specifically, as shown in fig. 8, the second frame 27 includes a second top panel 271, a second left side panel 272, a second bottom panel 273, and a right side panel 28. Wherein, the second top plate 271 and the second bottom plate 273 are oppositely arranged, and the second left side plate 272 and the right side plate 28 are oppositely arranged between the second top plate 271 and the second bottom plate 273 and respectively contact with the left end and the right end of the two for supporting. In this embodiment, the edges of the second top panel 271, the second left side panel 272, the second bottom panel 273, and the right side panel 28 are all bent inward for easy assembly; the second left side panel 272, the second bottom panel 273 and the right side panel 28 can be formed by bending a sheet metal material, i.e., can be of an integral structure, and has the advantages of convenience in processing and low cost. The second frame 27 is preferably made of sheet metal material, and is easy to process in batches, and the processing is simple and the cost is low. In this embodiment, the second frame 27 is arranged reasonably, so that the overall size of the power unit is reduced, and the overall power density of the power unit is improved.
In this embodiment, the top end of the third metal substrate 32 is connected to the second top plate 271, the left end is connected to the second left side plate 272, the bottom end is connected to the second bottom plate 273, and the right end is connected to the right side plate 28. The second power board 33, the third power board 34, the second control board 29 and the capacitor board 38 are respectively fixed on one side of the third metal substrate 32 through a plurality of hexagonal isolation pillars 31 (in this embodiment, four hexagonal isolation pillars are used for the above four), so as to be fixed on the third metal substrate 32; the second energy-obtaining power supply 30 is fixed on one side of the third metal substrate 32 and located between the second control board 29 and the third metal substrate 32, that is, the second control board 29 is located above the second energy-obtaining power supply 30.
As shown in fig. 9 and 10, the high voltage module 4 further includes a third insulating plate 36 and a fourth insulating plate 46 disposed inside the second frame 27. The third insulating plate 36 is fixed on the right side plate 28 of the second frame 27 (the two are arranged in parallel), the fourth insulating plate 46 is fixed on the second left side plate 272 of the second frame 27 (the two are arranged in parallel), the second incoming copper bar 44 sequentially passes through the second left side plate 272 and the fourth insulating plate 46 of the second frame 27 and is fixed on the second left side plate 272, one end of the second incoming copper bar 44, which is positioned outside the second frame, is connected with the output end of the high-frequency isolation transformer 7, and one end of the second incoming copper bar 44, which is positioned inside the second frame, is connected with the input end of the third power single plate 34; the outgoing line copper bar 37 sequentially passes through the right side plate 28 and the third insulating plate 36 of the second frame 27 and is fixed on the right side plate 28, one end of the outgoing line copper bar 37, which is positioned in the second frame, is connected with the output end of the alternating current filter inductor 35, and one end of the outgoing line copper bar 37, which is positioned outside the second frame, is connected with the alternating current output outside the power unit. In this embodiment, the third insulating plate 36 is used to isolate the outgoing copper bar 37 from the right side plate 28 of the second frame 27, so as to prevent the second frame 27 from being electrified; the fourth insulating plate 46 is used for isolating the second incoming copper bar 44 from the second left side plate 272 of the second frame 27, and preventing the second frame 27 from being electrified.
As shown in fig. 8 and 10, the high-voltage module 4 further includes a second air duct mounting plate 41 disposed inside the second frame 27 and located between the second power single plate 33 and the third metal substrate 32, and a third air duct mounting plate 42 located between the third power single plate 34 and the third metal substrate 32, where the second air duct mounting plate 41 and the third air duct mounting plate 42 both adopt U-shaped structures, and both openings of the two are facing the third metal substrate 32 and fixed thereon, a second heat sink 40 is disposed in the second air duct mounting plate 41, and a third heat sink 43 is disposed in the third air duct mounting plate 42; a through hole (in this embodiment, a square through hole) is formed in the second air duct mounting plate 41 at a position corresponding to the second heat sink 40, and the heating device of the second power board 33 passes through the through hole and is fixed on the second heat sink 40; a through hole (in this embodiment, a square through hole) is formed in the third air duct mounting plate 42 at a position corresponding to the third heat sink 43, and the heating device of the third power board 34 passes through the through hole and is fixed to the third heat sink 43.
As shown in fig. 8 and 10, the high voltage module 4 further includes a first laminated busbar 39 and a second laminated busbar 45 disposed inside the second frame 27, a first hole (a square hole in this embodiment) is disposed at a position on the third metal substrate 32 corresponding to the second power board 33, a second hole (a square hole in this embodiment) is disposed at a position corresponding to the third power board 34, the first laminated busbar 39 passes through the first hole, and both ends of the first laminated busbar 39 are respectively connected to the second power board 33 and the capacitor plate 38, so as to connect the second power board 33 and the capacitor plate 38, so as to reduce interference, and the second laminated busbar 45 passes through the second hole, and both ends of the second laminated busbar are respectively connected to the third power board 34 and the capacitor plate 38, so as to connect the third power board 34 and the capacitor plate 38, so as to reduce interference.
Preferably, the distance between the edge of the first hole and the metal edge corresponding to the first laminated busbar 39, and the distance between the edge of the second hole and the metal edge corresponding to the second laminated busbar 45 are both greater than 10mm, preferably 20mm, so as to ensure the minimum electrical gap required by a 1000V voltage level; the first laminated busbar 39 and the second laminated busbar 45 have the function of reducing the parasitic inductance of the direct current loop, so that the circuit is safer.
Preferably, the second power board 33 and the third power board 34 both use TO-247 packaged separate devices, and the rectifiers in the second power board 33 and the third power board 34 in this structure are designed in a single board mode, so as TO reduce the size of the power unit.
Preferably, as shown in fig. 9, the capacitor plate 38 adopts an on-board capacitor, and a plurality of capacitors are integrated into one capacitor plate in parallel, so that compared with a general columnar capacitor, the on-board capacitor improves the filtering performance and greatly saves the internal space of the power unit.
Fig. 8 is a perspective view, fig. 9 is a front view, fig. 10 is a rear view, and fig. 10 hides the second power board 33 and the third power board 34 from fig. 8.
In summary, in the solid-state transformer provided by the embodiment of the present invention, the low-voltage module and the high-frequency isolation transformer are fixed together, and the high-frequency isolation transformer and the high-voltage module are connected by using the plug-in structure, so that each power unit is fixed inside the cabinet by using the plug-in structure, and thus the solid-state transformer composed of a plurality of power units is conveniently and quickly installed, and the assembly workload is greatly reduced;
the frame structures of the low-voltage module and the high-voltage module are made of sheet metal materials, so that the batch processing is easy, the processing is simple, and the cost is low;
the high-voltage module connects the second power single board and the capacitor plate through the first laminated busbar, and connects the third power single board and the capacitor plate through the second laminated busbar, so that the interference is reduced to the maximum extent;
the output end of the high-frequency isolation transformer adopts the copper bar outgoing line, and the umbrella skirt is arranged around the copper bar, so that the creepage distance is increased, and the distance from the low-voltage module to the high-voltage module is reduced, thereby reducing the overall size of the solid-state transformer and improving the power density of the solid-state transformer.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A solid-state transformer is characterized by comprising a plurality of power units, wherein each power unit comprises a low-voltage module, a high-frequency isolation transformer, a high-voltage module and an opposite insertion assembly, the opposite insertion assembly is fixed on a cabinet back plate, the input end of the low-voltage module is connected with a direct current input outside the power unit, the output end of the low-voltage module is connected with the input end of the high-frequency isolation transformer, the output end of the high-frequency isolation transformer is inserted into one side of the opposite insertion assembly, the input end of the high-voltage module is inserted into the other side of the opposite insertion assembly, the output end of the high-voltage module is connected with an alternating current output outside the power unit, and the opposite insertion assembly can enable the output end of the high-frequency isolation transformer;
the interior of the low-voltage module adopts a stacked structure;
the low-voltage module comprises a first frame and the following components arranged inside the first frame:
the power unit comprises a first metal substrate, a first control single board arranged on one side of the first metal substrate, a first energy-taking power supply arranged on the other side of the first metal substrate, a second metal substrate, a first power single board arranged on one side of the second metal substrate, and a first incoming copper bar connected with the input end of the first power single board, wherein the first incoming copper bar is connected with a direct current input outside the power unit, and the output end of the first power single board is connected with the input end of the high-frequency isolation transformer;
the low-voltage module further comprises a first insulating plate, a second insulating plate and a first air channel mounting plate which are arranged inside the first frame, the first insulating plate is fixed on the side face inside the first frame, the second insulating plate and the first air channel mounting plate are both arranged between the first power single plate and the second metal base plate, the second insulating plate is fixed on the second metal base plate and is perpendicular to and vertical to the first insulating plate, the first air channel mounting plate is of a U-shaped structure, the opening of the first air channel mounting plate faces the second insulating plate and is fixed between the first insulating plate and the second insulating plate, and a first radiator is arranged in the first air channel mounting plate;
and a through hole is formed in the first air duct mounting plate at a position corresponding to the first radiator, and the heating device of the first power single plate penetrates through the through hole and is fixed on the first radiator.
2. The solid state transformer of claim 1, wherein the high voltage module is internally stacked.
3. The solid state transformer of claim 1, wherein the high frequency isolation transformer is secured within the first frame.
4. The solid-state transformer according to claim 1, wherein the first power board is fixed to one side of the second metal substrate by a plurality of hexagonal isolation pillars.
5. The solid-state transformer of claim 1, wherein the low-voltage module further comprises a corner piece disposed inside the first frame, the first incoming copper bar and the corner piece are both L-shaped and disposed in parallel, one sidewall of the first incoming copper bar is connected to a dc input outside the power unit, the other sidewall of the first incoming copper bar sequentially passes through the side surface and the first insulating plate inside the first frame and is fixedly connected to one sidewall of the corner piece, the other sidewall of the corner piece is fixed to the first insulating plate, and the other sidewall of the first incoming copper bar is further connected to an input end of the first power board.
6. The solid state transformer of claim 2, wherein the high voltage module comprises a second frame, and the following disposed inside the second frame:
a third metal substrate, a second power single board, a third power single board, a second control single board and a second energy-taking power supply which are arranged on one side of the third metal substrate, a second incoming line copper bar connected with the input end of the third power single board, an alternating current filter inductor and a capacitor board which are arranged on the other side of the third metal substrate, and an outgoing line copper bar connected with the output end of the alternating current filter inductor,
and the second incoming copper bar is respectively connected with the output end of the high-frequency isolation transformer and the input end of a third power single plate, the output end of the third power single plate and the input end of the second power single plate are both connected with the capacitor plate, the output end of the second power single plate is connected with the input end of the alternating current filter inductor, the output end of the alternating current filter inductor is connected with an outgoing copper bar, and the outgoing copper bar is also connected with the alternating current output outside the power unit.
7. The solid state transformer of claim 6, wherein the high voltage module further comprises a third insulating plate and a fourth insulating plate respectively fixed to inner sides of the second frame,
the second incoming line copper bar sequentially penetrates through the side face in the second frame and the fourth insulating plate and is fixed on the second frame, one end, located outside the second frame, of the second incoming line copper bar is connected with the output end of the high-frequency isolation transformer, and one end, located in the second frame, of the second incoming line copper bar is connected with the input end of the third power single plate;
the outgoing line copper bar sequentially penetrates through the side face and the third insulating plate in the second frame and is fixed on the second frame, one end, located in the second frame, of the outgoing line copper bar is connected with the output end of the alternating current filter inductor, and one end, located outside the second frame, of the outgoing line copper bar is connected with alternating current output outside the power unit.
8. The solid-state transformer according to claim 6, wherein the second power single board, the third power single board and the second control single board are respectively fixed on one side of the third metal substrate through a plurality of hexagonal isolation pillars;
the high-voltage module also comprises a second air duct mounting plate which is arranged in the second frame and is positioned between the second power single plate and the third metal substrate, and a third air duct mounting plate which is positioned between the third power single plate and the third metal substrate, wherein the second air duct mounting plate and the third air duct mounting plate both adopt U-shaped structures, the openings of the second air duct mounting plate and the third air duct mounting plate face the third metal substrate and are fixed on the third metal substrate, a second radiator is arranged in the second air duct mounting plate, and a third radiator is arranged in the third air duct mounting plate;
a through hole is formed in the second air duct mounting plate at a position corresponding to the second radiator, and the heating device of the second power single plate penetrates through the through hole and is fixed on the second radiator; and a through hole is formed in the third air duct mounting plate at a position corresponding to the third radiator, and the heating device of the third power single plate penetrates through the through hole and is fixed on the third radiator.
9. The solid-state transformer of claim 6, wherein the high voltage module further comprises a first laminated busbar and a second laminated busbar arranged inside the second frame, a first hole is formed in a position on the third metal substrate corresponding to the second power board, a second hole is formed in a position on the third metal substrate corresponding to the third power board, the first laminated busbar penetrates through the first hole, two ends of the first laminated busbar are respectively connected with the second power board and the capacitor plate, and the second laminated busbar penetrates through the second hole, and two ends of the second laminated busbar are respectively connected with the third power board and the capacitor plate.
10. The solid-state transformer according to any one of claims 1 to 9, wherein the high frequency isolation transformer is in a horizontal structure, the output end of the high frequency isolation transformer is a copper bar outgoing line, the input end of the high frequency isolation transformer is a high voltage line outgoing line, and a shed is arranged around the copper bar, and is made of an insulating material.
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| CN108281263B (en) * | 2018-03-26 | 2023-06-02 | 江苏东方四通科技股份有限公司 | Integral structure of transformer and resonant capacitor of bar on-line annealing high-frequency induction power supply |
| CN108231347B (en) * | 2018-03-26 | 2023-06-02 | 江苏东方四通科技股份有限公司 | Integral structure of transformer and resonant capacitor of fast smelting furnace induction power supply |
| CN108923618B (en) * | 2018-06-26 | 2019-10-29 | 西安西电电力系统有限公司 | Electric power electric transformer |
| CN111277164A (en) * | 2020-03-14 | 2020-06-12 | 宁波锦浪新能源科技股份有限公司 | Split type photovoltaic inverter system who steps up and inverter circuit |
| CN111986883B (en) * | 2020-06-19 | 2022-11-15 | 阳光电源股份有限公司 | Solid-state transformer and preparation method thereof |
| CN113595408A (en) * | 2021-08-20 | 2021-11-02 | 青岛鼎信通讯股份有限公司 | Parallel module unit applied to power electronic transformer |
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| CN102437715A (en) * | 2011-12-21 | 2012-05-02 | 天津华宁电子有限公司 | Mining explosion-proof variable-frequency speed regulation device convenient to maintain |
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