CN109004854B - Power module structure and converter - Google Patents
Power module structure and converter Download PDFInfo
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- CN109004854B CN109004854B CN201810838109.0A CN201810838109A CN109004854B CN 109004854 B CN109004854 B CN 109004854B CN 201810838109 A CN201810838109 A CN 201810838109A CN 109004854 B CN109004854 B CN 109004854B
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- power 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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a power module structure and a converter, wherein each DC/DC power module is distributed on two sides of each DC/AC power module; or the DC/AC power modules are distributed on two sides of the DC/DC power modules; positive terminals and negative terminals are arranged on each DC/AC power module and each DC/DC power module; and the DC/AC power modules are connected with the positive terminals of the DC/DC power modules through positive busbars, and the DC/AC power modules are connected with the negative terminals of the DC/DC power modules through negative busbars. The whole commutation loop is in a symmetrical structure, and the commutation paths of the DC/DC power module or the DC/AC power module are consistent no matter the DC/DC power module or the DC/AC power module operates independently, so that stray inductance is reduced, current oscillation of a direct-current bus is avoided, temperature rise of a bus capacitor is reduced, and stable and reliable operation of a centralized virtual synchronization set is guaranteed.
Description
Technical Field
The invention belongs to the technical field of virtual synchronous machines, and particularly relates to a power module structure and a converter.
Background
The high-capacity centralized virtual synchronous machine is generally required to be above MW level, the primary side AC input is AC35kV or 10kV voltage, and the secondary side outputs DC voltage to be connected with a battery system. Based on current battery manufacturing levels, the maximum voltage of a battery system is typically below DC 1000V. The alternating current side of the virtual synchronous machine is directly connected to the grid or connected to the grid through an isolation transformer, and the direct current side of the virtual synchronous machine is connected with 2 or more battery packs. The converter generally adopts a topology of more than 2 levels to meet the application requirements, such as a 1-level DC/AC power module + 1-level DC/DC power module.
The DC/AC power module and the DC/DC power module are both formed by devices such as IGBT and the like, the IGBT power module is used as a core part of the converter and is widely applied in various fields, the existing IGBT power module is generally designed in an integrated mode, and parts such as a radiator, the IGBT, a supporting capacitor, a direct current busbar, a gate pole driving board, a pulse distribution board, a temperature relay and the like are integrated together to form an independent functional unit structure, so that the current conversion functions such as rectification, inversion or chopping can be completed, and the current conversion module can be installed and detached from the converter as an independent part. The existing DC/DC power module and the DC/AC power module do not have a specific placement structure, the DC/DC power module and the DC/AC power module in the existing design often adopt an asymmetric structure, the current conversion paths of the power module are not consistent due to the asymmetry of the topological structure, the direct current bus current can be caused to vibrate in the operation process of the converter, the temperature rise of the bus capacitor is not consistent, the service life of the virtual synchronous machine is shortened, and the temperature of the direct current bus capacitor can reach more than 90 ℃ in severe cases and exceed the temperature allowable range of the capacitor, so that the heat damage of the bus capacitor is caused.
Disclosure of Invention
The invention aims to provide a power module structure and a converter, which are used for solving the problem of direct current bus oscillation caused by unreasonable structure arrangement of a power module in the prior art.
In order to achieve the above object, the present invention provides a power module structure, which includes at least two DC/DC power modules and at least two DC/AC power modules, wherein the DC/AC power modules are arranged in parallel and in a centralized manner, and the DC/DC power modules are distributed on two sides of the DC/AC power modules; or the DC/DC power modules are arranged in a centralized and parallel mode, and the DC/AC power modules are distributed on two sides of the DC/DC power modules; positive terminals and negative terminals are arranged on each DC/AC power module and each DC/DC power module; and the DC/AC power modules are connected with the positive terminals of the DC/DC power modules through positive busbars, and the DC/AC power modules are connected with the negative terminals of the DC/DC power modules through negative busbars.
The positive electrode busbar and the negative electrode busbar are arranged in an overlapping mode as further limitation of the positive electrode busbar and the negative electrode busbar.
Furthermore, the positive terminals and the negative terminals of the DC/DC power modules are arranged in the same mode; the positive terminal and the negative terminal of each DC/AC power module are arranged in the same mode; the arrangement mode of the positive terminal and the negative terminal of the DC/DC power module is opposite to that of the positive terminal and the negative terminal of the DC/AC power module; the positive electrode busbar is provided with positive electrode connecting fixed ends corresponding to the positions of positive electrode terminals of the DC/DC power modules and the DC/AC power modules; and the negative electrode busbar is provided with a negative electrode connecting fixed end corresponding to the positions of the negative electrode terminals of the DC/DC power modules and the DC/AC power modules.
Furthermore, the two sides of the positive busbar and the negative busbar are symmetrically provided with groove-shaped structures.
Further, the groove-shaped structure is oval.
The invention also provides a converter which comprises a power module structure, wherein the power module structure comprises at least two DC/DC power modules and at least two DC/AC power modules, the DC/AC power modules are arranged in a centralized and parallel mode, and the DC/DC power modules are distributed on two sides of the DC/AC power modules; or the DC/DC power modules are arranged in a centralized and parallel mode, and the DC/AC power modules are distributed on two sides of the DC/DC power modules; positive terminals and negative terminals are arranged on each DC/AC power module and each DC/DC power module; and the DC/AC power modules are connected with the positive terminals of the DC/DC power modules through positive busbars, and the DC/AC power modules are connected with the negative terminals of the DC/DC power modules through negative busbars.
The positive electrode busbar and the negative electrode busbar are arranged in an overlapping mode as further limitation of the positive electrode busbar and the negative electrode busbar.
Furthermore, the positive terminals and the negative terminals of the DC/DC power modules are arranged in the same mode; the positive terminal and the negative terminal of each DC/AC power module are arranged in the same mode; the arrangement mode of the positive terminal and the negative terminal of the DC/DC power module is opposite to that of the positive terminal and the negative terminal of the DC/AC power module; the positive electrode busbar is provided with positive electrode connecting fixed ends corresponding to the positions of positive electrode terminals of the DC/DC power modules and the DC/AC power modules; and the negative electrode busbar is provided with a negative electrode connecting fixed end corresponding to the positions of the negative electrode terminals of the DC/DC power modules and the DC/AC power modules.
Furthermore, the two sides of the positive busbar and the negative busbar are symmetrically provided with groove-shaped structures.
Further, the groove-shaped structure is oval.
The invention has the beneficial effects that:
the power module structure of the invention distributes each DC/DC power module on two sides of the DC/AC power module; or the DC/AC power modules are distributed on two sides of the DC/DC power modules; each DC/AC power module and each DC/DC power module are provided with a positive terminal and a negative terminal; and the DC/AC power modules are connected with the positive terminals of the DC/DC power modules through positive busbars, and the DC/AC power modules are connected with the negative terminals of the DC/DC power modules through negative busbars. The whole commutation loop is in a symmetrical structure, and the commutation paths of the DC/DC power module or the DC/AC power module are consistent no matter the DC/DC power module or the DC/AC power module operates independently, so that stray inductance is reduced, current oscillation of a direct-current bus is avoided, temperature rise of a bus capacitor is reduced, and stable and reliable operation of a centralized virtual synchronization set is guaranteed.
Drawings
FIG. 1 is a schematic diagram of a 2-level topology DC/DC + DC/AC of a centralized virtual synchronous machine;
fig. 2 is a schematic diagram of a layout structure of a power module and a dc bus bar;
fig. 3 is a schematic structural diagram of the positive and negative overlapping busbars, the positive busbar and the negative busbar in sequence from top to bottom.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings:
the invention provides a current transformer which comprises a power module structure, wherein the power module structure comprises at least two DC/DC power modules and at least two DC/AC power modules, the DC/AC power modules are arranged in a centralized and parallel mode, and the DC/DC power modules are distributed on two sides of the DC/AC power modules; or the DC/DC power modules are arranged in a centralized and parallel mode, and the DC/AC power modules are distributed on two sides of the DC/DC power modules; positive terminals and negative terminals are arranged on each DC/AC power module and each DC/DC power module; and the DC/AC power modules are connected with the positive terminals of the DC/DC power modules through positive busbars, and the DC/AC power modules are connected with the negative terminals of the DC/DC power modules through negative busbars.
Further, the positive terminals and the negative terminals of the DC/DC power modules of the present embodiment are arranged in the same manner; the positive terminal and the negative terminal of each DC/AC power module are arranged in the same mode; the arrangement mode of the positive terminal and the negative terminal of the DC/DC power module is opposite to that of the positive terminal and the negative terminal of the DC/AC power module; the positive electrode busbar is provided with positive electrode connecting fixed ends corresponding to the positions of positive electrode terminals of the DC/DC power modules and the DC/AC power modules; and the negative electrode busbar is provided with a negative electrode connecting fixed end corresponding to the positions of the negative electrode terminals of the DC/DC power modules and the DC/AC power modules. The groove structures are symmetrically arranged on two sides of the positive busbar and the negative busbar, and the positive busbar and the negative busbar of the embodiment are in a laminated arrangement structure.
Specifically, as shown in fig. 1, the centralized virtual synchronous machine includes a two-pole topology of DC/DC power module + DC/AC power module. The DC/DC power module and the DC/AC power module may have multiple inputs, as shown in fig. 2, and include three DC/AC power modules and two DC/DC power modules, the three DC/AC power modules are sequentially placed at the middle position, the DC/DC1 and the DC/DC2 power modules are placed at two sides of the DC/AC power module, and the whole circulation loop presents a symmetrical structure, and the same commutation path is used for the DC/AC power module regardless of whether the DC/DC1 power module or the DC/DC2 power module or both are operated alone. In order to meet the expansion requirement, when the 2-way DC/DC power module is expanded into the 4-way DC/DC power module, only 1 DC/DC power module needs to be added to each of two sides of the DC/DC power module.
The positive pole of a DC/DC power module and the positive pole of the DC/AC power module of the power module structure are both connected with a positive busbar of a direct-current busbar, the negative pole of the DC/DC power module and the negative pole of the DC/AC power module are both connected with a negative busbar of the direct-current busbar, the positive pole of the DC/AC power module is above the power module, and the negative pole is below the power module. The positive pole of the DC/DC power module is below the power module and the negative pole is above the power module. The alternating arrangement of the positive and negative electrodes of the DC/DC power modules and the DC/AC power modules enables the amount of current flowing into the bus capacitor at the side close to the bus bar to be subjected to certain resistance, so that current flowing out of the DC capacitor bus bar flows into the center of each DC/DC power module through a wider area on the laminated bus bar first, and then flows to the input end of each DC/DC power module respectively, and therefore the current flowing through the DC bus bars of each DC/DC power module is basically the same, the current sharing characteristic among the DC/DC power modules is effectively improved, stray inductance is reduced to the minimum degree, the consistency of the bus capacitor current of each power module is ensured, and the oscillation of the DC bus current is avoided.
As shown in fig. 3, the positive busbar and the negative busbar are stacked through the insulating layer, and are strictly symmetrical, and the thicknesses of the insulating materials of the positive busbar and the negative busbar are both 2 mm.
In order to balance the current flowing into the positive and negative busbars on the direct current busbar capacitor busbar, symmetrical elliptical slotted structures are arranged on the positive and negative busbars. When no groove is formed around the mounting hole positions of the positive and negative electrode busbars, the positive electrode current and the negative electrode current are staggered when viewed in the up-down direction of the laminated busbar; and the current flowing out of the direct current bus capacitor busbar can directly travel a close path according to the principle that the impedance in the circuit is small, so that the currents flowing into the positive electrode bus capacitor and the negative electrode bus capacitor are inconsistent, unbalance is caused to the currents flowing through the DC/DC power modules, the impedances are inconsistent, and bus current resonance is caused. After the grooves are formed in the positive and negative busbars, the positive current and the negative current are both shunted by the elliptical grooves, and the shunted positive current and the shunted negative current are overlapped when viewed in the up-down direction of the laminated busbar, so that stray inductance is reduced. And the current paths of the positive and negative electrodes of the DC/DC power modules are basically the same, so that the positive and negative electrodes of each DC/DC power module are kept consistent, and stray inductance of the busbar is reduced to the greatest extent. Therefore, the laminated busbar design of the embodiment has the characteristics of strong anti-interference capability, good reliability and space saving, and the stray inductance is greatly reduced. The slotted structure in this embodiment is an oval shape, which is a preferred embodiment, and as another embodiment, it may be designed to be a circular shape.
In this embodiment, the DC/AC power module is placed in the middle, and the DC/DC power modules are placed on two sides of the DC/AC power module, as another embodiment, the DC/DC power module may be placed in the middle, and the DC/AC power modules are placed on two sides of the DC/DC power module.
The high-voltage DC/AC power module of the embodiment can be changed from an MMC topology to a bidirectional full-bridge power module, and the DC/DC power module is changed from a bidirectional LLC converter to an LC resonance converter and the like.
The invention has the key points that the DC/DC power modules are symmetrically arranged at two sides of the DC/AC power module, or the DC/AC power modules are symmetrically arranged at two sides of the DC/DC power module, and by adopting the mode, the stray inductance can be reduced, and the bus capacitance oscillation can be effectively inhibited; further, stray inductance is reduced to a greater extent through the design of the laminated busbar, and stable and reliable operation of the virtual synchronous generator is guaranteed.
The specific embodiments are given above, but the present invention is not limited to the above-described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (6)
1. A power module structure is characterized by comprising at least two DC/DC power modules and at least two DC/AC power modules, wherein the DC/AC power modules are arranged in a centralized and parallel mode and are distributed on two sides of the DC/AC power modules; or the DC/DC power modules are arranged in a centralized and parallel mode, and the DC/AC power modules are distributed on two sides of the DC/DC power modules; positive terminals and negative terminals are arranged on each DC/AC power module and each DC/DC power module; each DC/AC power module is connected with the positive terminal of each DC/DC power module through a positive busbar, and each DC/AC power module is connected with the negative terminal of each DC/DC power module through a negative busbar;
the positive busbar and the negative busbar are arranged in an overlapping manner;
the positive terminal and the negative terminal of each DC/DC power module are arranged in the same mode; the positive terminal and the negative terminal of each DC/AC power module are arranged in the same mode; the arrangement mode of the positive terminal and the negative terminal of the DC/DC power module is opposite to that of the positive terminal and the negative terminal of the DC/AC power module; the positive electrode busbar is provided with positive electrode connecting fixed ends corresponding to the positions of positive electrode terminals of the DC/DC power modules and the DC/AC power modules; and the negative electrode busbar is provided with a negative electrode connecting fixed end corresponding to the positions of the negative electrode terminals of the DC/DC power modules and the DC/AC power modules.
2. The power module structure of claim 1, wherein the positive busbar and the negative busbar are symmetrically provided with groove structures at two sides.
3. The power module structure of claim 2 wherein the slot-type structure is oval-shaped.
4. The converter is characterized by comprising a power module structure, wherein the power module structure comprises at least two DC/DC power modules and at least two DC/AC power modules, the DC/AC power modules are arranged in a centralized and parallel mode, and the DC/DC power modules are distributed on two sides of the DC/AC power modules; or the DC/DC power modules are arranged in a centralized and parallel mode, and the DC/AC power modules are distributed on two sides of the DC/DC power modules; positive terminals and negative terminals are arranged on each DC/AC power module and each DC/DC power module; each DC/AC power module is connected with the positive terminal of each DC/DC power module through a positive busbar, and each DC/AC power module is connected with the negative terminal of each DC/DC power module through a negative busbar;
the positive busbar and the negative busbar are arranged in an overlapping manner;
the positive terminal and the negative terminal of each DC/DC power module are arranged in the same mode; the positive terminal and the negative terminal of each DC/AC power module are arranged in the same mode; the arrangement mode of the positive terminal and the negative terminal of the DC/DC power module is opposite to that of the positive terminal and the negative terminal of the DC/AC power module; the positive electrode busbar is provided with positive electrode connecting fixed ends corresponding to the positions of positive electrode terminals of the DC/DC power modules and the DC/AC power modules; and the negative electrode busbar is provided with a negative electrode connecting fixed end corresponding to the positions of the negative electrode terminals of the DC/DC power modules and the DC/AC power modules.
5. The converter according to claim 4, wherein the positive busbar and the negative busbar are symmetrically provided with groove-shaped structures at two sides.
6. The current transformer of claim 5, wherein the slot-type structure is oval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810838109.0A CN109004854B (en) | 2018-07-26 | 2018-07-26 | Power module structure and converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810838109.0A CN109004854B (en) | 2018-07-26 | 2018-07-26 | Power module structure and converter |
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| CN109004854A CN109004854A (en) | 2018-12-14 |
| CN109004854B true CN109004854B (en) | 2020-12-08 |
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| CN201810838109.0A Active CN109004854B (en) | 2018-07-26 | 2018-07-26 | Power module structure and converter |
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| US11962262B2 (en) * | 2018-12-28 | 2024-04-16 | Vestas Wind Systems A/S | Wind turbine with virtual synchronous generator and DC link control |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020034088A1 (en) * | 2000-09-20 | 2002-03-21 | Scott Parkhill | Leadframe-based module DC bus design to reduce module inductance |
| CN101826837A (en) * | 2010-06-12 | 2010-09-08 | 四川吉风电源科技有限公司 | Variable frequency control power module of wind power generator |
| CN202406036U (en) * | 2011-11-30 | 2012-08-29 | 江苏大全凯帆电器股份有限公司 | Laminated busbar photovoltaic inverter |
| CN203219169U (en) * | 2013-05-08 | 2013-09-25 | 株洲南车时代电气股份有限公司 | Converter device |
| CN203368361U (en) * | 2013-08-03 | 2013-12-25 | 阳光电源股份有限公司 | Photovoltaic inverter with multipath direct current input |
| CN203747194U (en) * | 2014-02-27 | 2014-07-30 | 上海伟肯实业有限公司 | Laminated busbar |
| CN204168155U (en) * | 2014-09-30 | 2015-02-18 | 阳光电源股份有限公司 | One builds up busbar |
| CN107134933A (en) * | 2017-05-25 | 2017-09-05 | 北京重恒兴远科技有限公司 | A kind of power-supply device exported with multiple voltage grade |
| CN107733248A (en) * | 2017-11-21 | 2018-02-23 | 臻驱科技（上海）有限公司 | Vehicle electric converting means |
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