CN212114212U - Laminated busbar of medium-high power energy storage converter - Google Patents
Laminated busbar of medium-high power energy storage converter Download PDFInfo
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- CN212114212U CN212114212U CN202020661427.7U CN202020661427U CN212114212U CN 212114212 U CN212114212 U CN 212114212U CN 202020661427 U CN202020661427 U CN 202020661427U CN 212114212 U CN212114212 U CN 212114212U
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Abstract
The utility model discloses a female row of stromatolite of well high-power energy storage converter, include: the device comprises a capacitor bus and a module bus which are connected with each other, wherein the capacitor bus is used for mounting a capacitor, and the module bus is used for mounting an IGBT; the female arranging of electric capacity includes: the conductive hole array comprises a plurality of groups of conductive hole arrays and a plurality of hole sites which are positioned in two side areas of the conductive hole arrays and used for installing bus capacitors, wherein the hole sites in the two side areas are the same and have symmetrical polarity; the conductive hole row group is used for being connected with the module busbar. The invention shortens the commutation loop through reasonable layout of the power device based on shortening the commutation loop path and the current unbalanced path of the power device, can effectively reduce stray inductance, greatly reduces the turn-off overvoltage of the power device, saves a du/dt absorption circuit, has more compact structure while reducing cost, further improves power density, enlarges the safe working area of the converter, and is beneficial to the long-term safe and stable operation of the three-level converter.
Description
Technical Field
The utility model relates to a female row of stromatolite of well high-power energy storage converter belongs to new forms of energy power generation technical field.
Background
In recent years, the energy storage converter is widely applied to the fields of electric power systems, rail transit, new energy vehicles, wind power generation, solar photovoltaic and the like, energy bidirectional flow is realized on occasions of peak clipping and valley filling of a power grid, smooth new energy fluctuation, energy recycling and the like, the voltage frequency of the power grid is actively supported, and the quality of power supply and electric energy is improved. And is moving toward high efficiency and high power density. With the requirement of the energy storage converter on the volume and the efficiency, the electrical structure of the energy storage converter is gradually applied to a three-level topological structure with higher efficiency, and the switching frequency is improved accordingly. The use of high switching frequency and multiple power devices will bring high switching loss and high voltage stress, so the requirement of the energy storage converter on the stray inductance parameters of the power device module electrical loop is more strict, and in order to eliminate the switching loss and the turn-off overvoltage problems caused by the stray inductance, the stray inductance parameters of the power module main loop must be optimized as much as possible. At present, the existing laminated busbar power device is not ideal in suppression effect on stray inductance due to the factors of unreasonable layout, excessive thickness of copper foils of an anode, a cathode and a neutral pole inside the busbar, too high height of a crimping terminal of the power device and the like.
The working frequency of the existing high-power energy storage converter such as a T-shaped three-level converter is generally about 5kHz, the arrangement structure of the capacitor in the laminated busbar is optimized, the parasitic inductance of a circulation loop in the converter is effectively reduced, and the peak voltage of a switch device in the converter at the turn-off time is reduced; the laminated busbar for the diode clamp type three-level converter disclosed by the prior art is characterized in that a module busbar is divided into five layers, stray inductance of a converter circuit can be greatly reduced, turn-off overvoltage of a device is effectively inhibited, a du/dt absorption circuit (namely a turn-off absorption circuit) is omitted, and the structure is more compact while the cost is reduced.
Although the stray inductance in the power device module circuit is improved to a certain extent by the application of the laminated busbar, the stress of the power device is inevitable due to the manufacturing and assembling errors, the busbar and the capacitor and other gravity effects, if the factors are not taken into consideration in the power device layout and laminated busbar design stage, the power device is likely to bear overlarge stress, and particularly, the busbar of the three-level converter is generally large, the number of the capacitors is large, and the risk is increased.
SUMMERY OF THE UTILITY MODEL
For solving prior art's not enough, the utility model aims to provide a female row of stromatolite of well high-power energy storage converter has solved female power device overall arrangement of current stromatolite unreasonable, to the unsatisfactory problem of stray inductance's suppression effect.
In order to achieve the above object, the utility model adopts the following technical scheme: a laminated busbar of a medium-high power energy storage converter comprises: the device comprises a capacitor bus and a module bus which are connected with each other, wherein the capacitor bus is used for mounting a capacitor, and the module bus is used for mounting an IGBT;
the female arranging of electric capacity includes: the capacitor comprises a plurality of groups of conductive hole rows and a plurality of hole sites for mounting capacitors, wherein the conductive hole rows comprise a positive conductive hole row, a zero conductive hole row and a negative conductive hole row which are sequentially arranged, the hole sites are respectively positioned at two sides of the positive conductive hole row and the negative conductive hole row, and the hole sites at the two sides are the same and have symmetrical polarity; the conductive hole row group is used for being connected with the module busbar.
Further, the capacitor busbar comprises seven layers, which are sequentially: a first insulating layer, a second capacitor anode conducting layer, a third insulating layer, a fourth capacitor zero conducting layer, a fifth insulating layer, a sixth capacitor cathode conducting layer and a seventh insulating layer; the second-layer capacitor positive electrode conducting layer further comprises a first terminal and a second terminal which are led out, the first terminal is connected with the positive electrode bus, and the second terminal is used for detecting voltage; the fourth capacitor zero-pole conducting layer further comprises a third terminal and a fourth terminal, wherein the third terminal is used for detecting voltage;
the first terminal and the fourth terminal are positioned at one end of the side edge of the capacitor bus bar, the second terminal, the third terminal and the fifth terminal are sequentially positioned at the other end of the same side edge of the capacitor bus bar, the second terminal is positioned at the inner end, and the fifth terminal is positioned at the outer end;
the first terminal and the second terminal are respectively vertically split from the capacitor busbar and are on a plane; the second terminal, the third terminal and the fifth terminal are all vertical to the capacitor busbar and are on a plane.
Further, the conductive hole row group includes: the positive pole conductive hole row, the zero-pole conductive hole row and the negative pole conductive hole row are sequentially arranged, and the long side direction of the conductive hole row is perpendicular to the side direction of the capacitor busbar with the terminal.
Further, the hole sites for installing the bus capacitors comprise: the capacitor comprises an anode hole site, a zero hole site and a cathode hole site, wherein a group of capacitor hole site groups with symmetrical polarities are respectively arranged on two sides of an anode conductive hole row and a cathode conductive hole row, each capacitor hole site group comprises four hole sites, two middle hole sites are the zero hole sites, and the polarities of the other two hole sites are opposite; the positive and negative polarities of adjacent non-zero hole sites in the two side regions of the conductive hole row group are opposite.
Furthermore, a pair of positive electrode hole sites and a pair of zero electrode hole sites are respectively arranged between the multiple groups of conductive hole rows.
Further, the module busbar comprises seven layers, which are sequentially: a first insulating layer, a second module anode conducting layer, a third insulating layer, a fourth module zero conducting layer, a fifth insulating layer, a sixth module cathode conducting layer and a seventh insulating layer;
the module anode conducting layer further comprises a lead-out sixth terminal, the module cathode conducting layer further comprises a lead-out seventh terminal, the module zero conducting layer further comprises a lead-out eighth terminal, the eighth terminal is located between the seventh terminal and the sixth terminal, and the seventh terminal and the eighth terminal are oppositely opened with the sixth terminal to form 180 degrees
Furthermore, the sixth terminal, the eighth terminal and the seventh terminal are respectively connected with the positive conductive hole row, the zero conductive hole row and the negative conductive hole row of the capacitor bus bar.
Further, the module busbar is provided with: a plurality of positive mounting holes, zero mounting holes and negative mounting holes for mounting the IGBT; the positive mounting hole site and the negative mounting hole site respectively form a pair with the zero mounting hole site and are alternately arranged.
Furthermore, the first insulating layer, the third insulating layer, the fifth insulating layer and the seventh insulating layer of the capacitor busbar are all made of insulating paper, and the second capacitor positive conducting layer, the fourth capacitor zero conducting layer and the sixth capacitor negative conducting layer are made of red copper with the thickness of 1.5mm, 1.0mm and 1.5mm respectively;
furthermore, the first insulating layer, the third insulating layer, the fifth insulating layer and the seventh insulating layer of the module busbar are made of insulating paper, and the second module anode conducting layer, the fourth module zero-pole conducting layer and the sixth module cathode conducting layer are all made of red copper with the thickness of 1.0 mm.
The utility model discloses the beneficial effect who reaches: the invention shortens the commutation loop by reasonable layout of the power device based on shortening the commutation loop path and the current unbalanced path of the power device, optimizes and compounds the positive and negative electrode paths of the laminated busbar to offset the magnetic field radiation, can effectively reduce stray inductance, greatly reduces the turn-off overvoltage of the power device, saves a du/dt absorption circuit, reduces the cost, simultaneously makes the structure more compact, further improves the power density, enlarges the safe working area of the converter, and is beneficial to the long-term safe and stable operation of the three-level converter.
Drawings
Fig. 1 is a schematic diagram of a capacitor bus bar in an embodiment of the present invention;
fig. 2 is a schematic diagram of a module busbar according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 and 2, a laminated busbar of a medium-high power energy storage converter includes: the capacitor busbar and the module busbar are connected with each other; the capacitor bus bar is used for installing a capacitor, and the module bus bar is used for installing an IGBT switch;
female the arranging of electric capacity and the female integrative design of adoption of arranging of module, female the arranging of electric capacity includes seven layers, does in proper order: a first insulating layer, a second capacitor anode conducting layer, a third insulating layer, a fourth capacitor zero conducting layer, a fifth insulating layer, a sixth capacitor cathode conducting layer and a seventh insulating layer; the second-layer capacitor positive conducting layer further comprises a first terminal 1 and a second terminal 2 which are led out, the first terminal 1 is connected with a positive bus, the second terminal 2 is used for detecting voltage and is usually an external voltage Hall collecting point, the fourth-layer capacitor zero-pole conducting layer further comprises a third terminal 3 which is led out and is used for detecting voltage and is usually an external voltage Hall collecting point, the sixth-layer capacitor negative conducting layer further comprises a fourth terminal 4 and a fifth terminal 5 which are led out, the fourth terminal 4 is used for being connected with an external negative bus, the fifth terminal 5 is used for detecting voltage and is usually an external voltage Hall collecting point, and the seven layers are laminated together through insulating films in a hot-pressing mode.
The first terminal 1 and the fourth terminal 4 are positioned at one end of the side edge of the capacitor busbar, the second terminal 2, the third terminal 3 and the fifth terminal 5 are sequentially positioned at the other end of the same side edge of the capacitor busbar, the second terminal 2 is positioned at the inner end, and the fifth terminal 5 is positioned at the outer end;
according to the principle of strong and weak current signal isolation design, terminals 1 and 4 and terminals 2, 3 and 5 are respectively placed at two ends of the same side of the capacitor busbar. The terminal 1 and the terminal 4 are respectively vertically split from the capacitor bus bar and are arranged on a plane, and the terminal functions in connecting with positive and negative bus bar ports of the energy storage converter and carrying strong current signals; terminal 2, terminal 3, terminal 5 all are arranged perpendicularly with the electric capacity, and terminal 2, 3 and 5 are on a plane, and its effect is voltage signal acquisition port, walks the weak current signal. The terminals 2, 3 and 5 and the terminals 1 and 4 are respectively arranged at two ends of the capacitor bus bar, so that a voltage port acquisition signal is not interfered by radiation of a strong current magnetic field, and the accuracy of sampling precision is ensured.
The capacitor busbar further comprises: the bus capacitor comprises a plurality of groups of conductive hole rows positioned in the center of a capacitor bus and a plurality of hole sites positioned in two side areas of the conductive hole rows and used for installing a bus capacitor, wherein the hole sites in the two side areas are the same and have symmetrical polarity;
as shown in fig. 1, the three sets of rows of conductive holes in the embodiment form ports 9, 10 and 11;
the electrically conductive hole row group is arranged in being arranged with the module and is connected, includes: the positive electrode conductive hole row, the zero electrode conductive hole row and the negative electrode conductive hole row are sequentially arranged; the long side direction of the conductive hole row is vertical to the side direction of the capacitor bus bar with the terminal; the hole sites are respectively positioned at two sides of the positive electrode conductive hole row and the negative electrode conductive hole row, and the hole sites at the two sides are the same and have symmetrical polarity;
in the embodiment, the conductive hole row group comprises three groups, each conductive hole row is provided with three hole sites, the positive conductive hole row is a hole row led out from a positive conductive layer of the capacitor bus bar, the zero conductive hole row is a hole row led out from a zero conductive layer of the capacitor bus bar, and the negative conductive hole row is a hole row led out from a negative conductive layer of the capacitor bus bar;
the hole sites for installing the bus capacitors include: positive pole hole site (+), zero pole hole site (0) and negative pole hole site (-), two sides of the positive and negative pole conductive hole row are equipped with a group of capacitor hole site groups with symmetrical polarity respectively, the capacitor hole site group includes four hole sites, two middle hole sites are zero pole hole sites, the other two hole sites have opposite polarities, the positive and negative polarities between the adjacent non-zero hole sites in the two side regions of the conductive hole row group are opposite; positive pole hole sites (+), zero pole hole sites (0) or negative pole hole sites (-) and zero pole hole sites (0) are respectively arranged among the multiple groups of the conductive hole rows.
In the embodiment, the two side regions of the conductive hole row group respectively include 24 hole sites, and a pair of hole sites is respectively arranged between the three conductive hole row groups, as shown in fig. 1;
in fig. 1, a minimum commutation path is formed by sequencing a first row of capacitor hole sites on two sides of a conductive hole row from top to bottom according to a negative electrode hole site (-), a zero electrode hole site (0), a positive electrode hole site (+), a zero electrode hole site (0), a negative electrode hole site (-) and a positive electrode conductive hole row; and the second row of capacitor hole sites form a minimum commutation path from top to bottom according to the positive pole hole site (+), the zero pole hole site (0), the negative pole hole site (-), the zero pole hole site (0), the positive pole hole site (+) and the negative pole conductive hole row, so that the stray inductance of a circulation loop formed by the power device IGBT with the bus capacitor connected with the conductive hole row is reduced, and the risk of over-high peak voltage caused by the IGBT forced commutation is reduced.
Through the symmetrical design of the positive and negative polarities of the capacitor hole positions on the two sides of the conductive hole row, the current magnetic fields formed by the bus capacitors on the two sides and the power device IGBT connected with the conductive hole row are mutually offset, the current on the two sides is mutually balanced, and the problem of unbalanced path of the laminated busbar current on the market is solved.
The materials of the first insulating layer, the third insulating layer, the fifth insulating layer and the seventh insulating layer of the capacitor busbar are insulating paper, and the second capacitor positive conducting layer, the fourth capacitor zero conducting layer and the sixth capacitor negative conducting layer are made of 1.5mm, 1.0mm and 1.5mm red copper respectively.
The thickness of red copper of a conducting layer of a capacitor bus bar on the market is generally 2.0mm, and the stray inductance is reduced by 1.5 mm.
As shown in fig. 2, the module busbar also includes seven layers, which are thermally pressed into a whole by the insulating film, and sequentially include: the module comprises a first insulating layer, a second module anode conducting layer, a third insulating layer, a fourth module zero conducting layer, a fifth insulating layer, a sixth module cathode conducting layer and a seventh insulating layer.
The module anode conductive layer further comprises a lead-out sixth terminal 6, the module cathode conductive layer further comprises a lead-out seventh terminal 7, the module zero-pole conductive layer further comprises a lead-out eighth terminal 8, the eighth terminal is located between the seventh terminal 7 and the sixth terminal 6, and the seventh terminal 7 and the eighth terminal 8 are respectively opposite to the sixth terminal 6 and form 180 degrees
The positive conductive terminal 6 and the negative conductive terminal 7 of the module busbar are respectively connected with the positive conductive hole row and the negative conductive hole row of the capacitor busbar;
the module busbar is provided with: a plurality of positive mounting hole sites (+), zero mounting hole sites (0) and negative mounting hole sites (-) for mounting the IGBT, wherein the positive mounting hole sites are hole sites led out from the module positive conducting layer; the zero pole mounting hole is a hole led out from the module zero pole conductive layer; the negative mounting hole site is a hole site led out from the module negative conductive layer; the positive mounting hole site and the negative mounting hole site respectively form a pair with the zero mounting hole site and are alternately arranged.
In the embodiment, as shown in fig. 2, two symmetrically disposed hole groups are provided on the module busbar, and each hole group includes two pairs of hole sites, namely a negative electrode mounting hole and a zero electrode mounting hole, and a positive electrode mounting hole and a zero electrode mounting hole.
The materials of the first insulating layer, the third insulating layer, the fifth insulating layer and the seventh insulating layer of the module busbar are insulating paper, and the second module anode conducting layer, the fourth module zero-pole conducting layer and the sixth module cathode conducting layer are all made of 1.0mm red copper. The thickness of red copper of a module busbar conducting layer on the market is generally 1.5mm, and stray inductance is reduced by the thickness of 1.0 mm.
And a sixth terminal 6, an eighth terminal 8 and a seventh terminal 7 of the module busbar are respectively connected with a positive conductive hole row, a zero conductive hole row and a negative conductive hole row in a conductive hole row group of the capacitor busbar through bolts.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (10)
1. A laminated busbar of a medium-high power energy storage converter is characterized by comprising: the device comprises a capacitor bus and a module bus which are connected with each other, wherein the capacitor bus is used for mounting a capacitor, and the module bus is used for mounting an IGBT; the female arranging of electric capacity includes: the capacitor comprises a plurality of groups of conductive hole rows and a plurality of hole sites for mounting capacitors, wherein the conductive hole rows comprise a positive conductive hole row, a zero conductive hole row and a negative conductive hole row which are sequentially arranged, the hole sites are respectively positioned at two sides of the positive conductive hole row and the negative conductive hole row, and the hole sites at the two sides are the same and have symmetrical polarity; the conductive hole row group is used for being connected with the module busbar.
2. The laminated busbar of a medium-high power energy storage converter according to claim 1, wherein the capacitor busbar comprises seven layers, which are sequentially: a first insulating layer, a second capacitor anode conducting layer, a third insulating layer, a fourth capacitor zero conducting layer, a fifth insulating layer, a sixth capacitor cathode conducting layer and a seventh insulating layer; the second-layer capacitor positive electrode conducting layer further comprises a first terminal and a second terminal which are led out, the first terminal is connected with the positive electrode bus, and the second terminal is used for detecting voltage; the fourth capacitor zero-pole conducting layer further comprises a third terminal and a fourth terminal, wherein the third terminal is used for detecting voltage; the first terminal and the fourth terminal are positioned at one end of the side edge of the capacitor bus bar, the second terminal, the third terminal and the fifth terminal are sequentially positioned at the other end of the same side edge of the capacitor bus bar, the second terminal is positioned at the inner end, and the fifth terminal is positioned at the outer end; the first terminal and the fourth terminal are respectively and vertically split from the capacitor busbar and are on a plane; the second terminal, the third terminal and the fifth terminal are all vertical to the capacitor busbar and are on a plane.
3. The laminated busbar of a medium-high power energy storage converter according to claim 1, wherein the long side direction of the conductive hole row is perpendicular to the side direction of the capacitor busbar with the terminal.
4. The laminated busbar of a medium-high power energy storage converter according to claim 3, wherein the hole sites for installing the capacitors comprise: the capacitor comprises an anode hole site, a zero hole site and a cathode hole site, wherein a group of capacitor hole site groups with symmetrical polarities are respectively arranged on two sides of an anode conductive hole row and a cathode conductive hole row, each capacitor hole site group comprises four hole sites, two middle hole sites are the zero hole sites, and the polarities of the other two hole sites are opposite; the positive and negative polarities of adjacent non-zero hole sites in the two side regions of the conductive hole row group are opposite.
5. The laminated busbar of a medium-high power energy storage converter according to claim 1, wherein a pair of positive electrode hole sites and a pair of zero electrode hole sites are respectively arranged between the groups of the plurality of groups of the conductive hole rows.
6. The laminated busbar of a medium-high power energy storage converter according to claim 1, wherein the module busbar comprises seven layers, which are sequentially: a first insulating layer, a second module anode conducting layer, a third insulating layer, a fourth module zero conducting layer, a fifth insulating layer, a sixth module cathode conducting layer and a seventh insulating layer; the module anode conducting layer further comprises a lead-out sixth terminal, the module cathode conducting layer further comprises a lead-out seventh terminal, the module zero conducting layer further comprises a lead-out eighth terminal, the eighth terminal is located between the seventh terminal and the sixth terminal, and the seventh terminal and the eighth terminal are respectively split with the sixth terminal to form a 180-degree angle.
7. The laminated busbar of a medium-high power energy storage converter according to claim 6, wherein the sixth terminal, the eighth terminal and the seventh terminal are respectively connected with the positive electrode conductive hole row, the zero electrode conductive hole row and the negative electrode conductive hole row of the capacitor busbar.
8. The laminated busbar of a medium-high power energy storage converter according to claim 1, wherein the module busbar is provided with: a plurality of positive mounting holes, zero mounting holes and negative mounting holes for mounting the IGBT; the positive mounting hole site and the negative mounting hole site respectively form a pair with the zero mounting hole site and are alternately arranged.
9. The laminated busbar of a medium-high power energy storage converter according to claim 2, wherein the first insulating layer, the third insulating layer, the fifth insulating layer and the seventh insulating layer of the capacitor busbar are made of insulating paper, and the second capacitor positive electrode conducting layer, the fourth capacitor zero electrode conducting layer and the sixth capacitor negative electrode conducting layer are made of red copper with the thickness of 1.5mm, 1.0mm and 1.5mm respectively.
10. The laminated busbar of a medium-high power energy storage converter according to claim 6, wherein the first insulating layer, the third insulating layer, the fifth insulating layer and the seventh insulating layer of the module busbar are made of insulating paper, and the second module positive conducting layer, the fourth module zero conducting layer and the sixth module negative conducting layer are made of red copper with the thickness of 1.0 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020661427.7U CN212114212U (en) | 2020-04-27 | 2020-04-27 | Laminated busbar of medium-high power energy storage converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020661427.7U CN212114212U (en) | 2020-04-27 | 2020-04-27 | Laminated busbar of medium-high power energy storage converter |
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| CN212114212U true CN212114212U (en) | 2020-12-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114883876A (en) * | 2022-05-06 | 2022-08-09 | 合肥工业大学 | High-power laminated busbar structure with laminated terminals |
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2020
- 2020-04-27 CN CN202020661427.7U patent/CN212114212U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114883876A (en) * | 2022-05-06 | 2022-08-09 | 合肥工业大学 | High-power laminated busbar structure with laminated terminals |
| CN114883876B (en) * | 2022-05-06 | 2024-03-26 | 合肥工业大学 | High-power laminated busbar structure of terminal lamination |
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