CN220122785U - Power module unit structure, converter and energy storage power conversion system - Google Patents
Power module unit structure, converter and energy storage power conversion system Download PDFInfo
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- CN220122785U CN220122785U CN202321492197.6U CN202321492197U CN220122785U CN 220122785 U CN220122785 U CN 220122785U CN 202321492197 U CN202321492197 U CN 202321492197U CN 220122785 U CN220122785 U CN 220122785U
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- 238000004146 energy storage Methods 0.000 title claims abstract description 46
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims abstract description 42
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- 230000017525 heat dissipation Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000008358 core component Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The utility model discloses a power module unit structure, a converter and an energy storage power conversion system, which relate to the field of electric power energy storage equipment, and are characterized in that: the device comprises a plurality of IGBTs, a driving plate, a buffer capacitor, a radiator and a base; the radiator is arranged on the base, the IGBTs are arranged on a radiating substrate of the radiator, and the radiating fins of the radiator can slide back and forth along the direction of the radiating substrate so as to adjust the spacing between the radiating fins; one end, far away from the radiator, of the plurality of IGBTs is detachably connected with the driving plate; the snubber capacitor is connected in parallel with the plurality of IGBTs, wherein the IGBTs are connected in parallel with the IGBTs. The utility model solves the problem that the IGBT generates current unbalance under the high-power working condition.
Description
Technical Field
The utility model relates to the field of electric energy storage equipment, in particular to a power module unit structure, a converter and an energy storage power conversion system.
Background
With the gradual manifestation of the importance of energy storage technology, energy storage is considered as an important component in six links of 'acquisition-transmission-distribution-utilization-storage' in the power production process, and is also one of the key points of future development of a power supply system. The complete energy storage system comprises two parts: the energy storage device consists of various energy storage media and auxiliary control monitoring equipment thereof, and mainly realizes energy storage and monitoring; and the energy storage power conversion system (Power Conversion System PCS) is mainly composed of power electronic devices and is mainly responsible for realizing the functions of charging and discharging of an energy storage medium, power control and the like of the energy storage system.
The energy storage converter is used as key equipment in an energy storage power conversion system, and energy storage and release are realized through bidirectional conversion of alternating current and direct current. The power unit of the energy storage converter is used as a core component of the energy storage converter, and an IGBT (Insulated Gated Bipolar Transistor, insulated gate bipolar transistor) module is adopted, so that the device loss can be effectively reduced, and the conversion efficiency of the converter is improved.
Because the working mode of the energy storage power conversion system is a pulse working mode, the pulse working time is short, the pulse period is relatively long, the problem that the radiator dissipates heat slowly to the surrounding environment can be solved, and the radiator is cooled by adopting forced air cooling during the stop working period. Therefore, the main source of heat generation of the power unit of the energy storage converter is a plurality of IGBTs, and in the prior art, each IGBT adopts a separate radiator, and in a high-power working condition, each IGBT adopts a respective radiator to cause serious current imbalance.
Therefore, how to avoid the situation that the IGBT generates current unbalance under the high-power working condition is an urgent problem to be solved at present.
Disclosure of Invention
The utility model aims to provide a power module unit structure, a converter and an energy storage power conversion system, wherein in order to ensure temperature balance, parallel IGBTs are arranged on a common radiator, and on one hand, the temperature imbalance is reduced by utilizing thermal coupling; on the other hand, because the IGBT has positive temperature characteristics, when the junction temperature of the IGBT flowing through the larger current rises due to the increase of the dissipation power, the positive temperature characteristics force the current flowing through the IGBT to be reduced, and the effect of static current sharing is achieved, so that the current balance of the IGBT is in a good state, and the current unbalance condition is avoided. Further, the heat of the IGBT is firstly heated through heat conduction, then the heat is conducted to the radiating fins through the heat dissipation substrate, and finally the heat on the radiating fins is taken away through convection, so that the radiator capable of adjusting the distance between the radiating fins is designed, and the radiating effect of the IGBT is improved.
The technical aim of the utility model is realized by the following technical scheme:
in a first aspect of the present utility model, a power module unit structure is provided, including a plurality of IGBTs, a drive board, a buffer capacitor, a heat sink, and a base;
the radiator is arranged on the base, the IGBTs are arranged on a radiating substrate of the radiator, and the radiating fins of the radiator can slide back and forth along the direction of the radiating substrate so as to adjust the spacing between the radiating fins;
one end, far away from the radiator, of the plurality of IGBTs is detachably connected with the driving plate;
the snubber capacitor is connected in parallel with the plurality of IGBTs, wherein the IGBTs are connected in parallel with the IGBTs.
In one implementation, the IGBTs include a first IGBT, a second IGBT, a third IGBT, and a fourth IGBT;
the first IGBT, the second IGBT, the third IGBT and the fourth IGBT form an H-bridge circuit.
In one implementation, the power module unit structure further includes a stacked busbar connected to the driving board, and the buffer capacitor is connected in parallel with the plurality of IGBTs through the stacked busbar;
the alternating current output terminal of the laminated busbar is connected with the output end of each IGBT;
and the direct current input terminal of the laminated busbar is connected with the input end of each IGBT.
In one implementation, the number of snubber capacitances is equal to the number of IGBTs.
In one implementation, a supporting capacitor is arranged between the laminated busbar and the base, and the supporting capacitor is connected with the IGBTs in parallel through the laminated busbar.
In one implementation, the support capacitor is a dc support capacitor.
In one implementation scheme, the direct current input end of the laminated busbar is also connected with an energy release branch;
the energy release branch is connected with the IGBTs in parallel.
In one implementation, the energy release branch is formed by connecting an IGBT and a resistor in series.
In a second aspect of the utility model, a current transformer is provided, comprising a power module cell structure according to the first aspect of the utility model.
In a third aspect of the utility model, there is provided an energy storage power conversion system comprising a current transformer as described in the second aspect of the utility model, or a power module cell structure as described in the first aspect of the utility model.
Compared with the prior art, the utility model has the following beneficial effects:
1. in order to ensure temperature balance, the parallel IGBTs are arranged on a common radiator, and on one hand, the thermal coupling is utilized to reduce temperature unbalance; on the other hand, because the IGBT has positive temperature characteristics, when the junction temperature of the IGBT flowing through the larger current rises due to the increase of the dissipation power, the positive temperature characteristics force the current flowing through the IGBT to be reduced, and the effect of static current sharing is achieved, so that the current balance of the IGBT is in a good state, and the current unbalance condition is avoided. Further, the heat of the IGBT is firstly heated through heat conduction, then the heat is conducted to the radiating fins through the heat dissipation substrate, and finally the heat on the radiating fins is taken away through convection, so that the radiator capable of adjusting the distance between the radiating fins is designed, and the radiating effect of the IGBT is improved.
2. The high-power module needs to use IGBT devices in parallel, and as the current and frequency increase, the physical structure of the circuit becomes more important. Therefore, in order to reduce stray inductance of the circuit as much as possible, the utility model adopts the laminated busbar to connect the IGBT and the direct current support capacitor, so that the stray inductance is very small, the buffer circuit cannot oscillate with the parasitic inductance of the direct current busbar, and the whole volume of the power module unit structure is reduced.
3. The utility model can ensure that the circuit layout is as tight, compact and symmetrical as possible by using the laminated busbar to connect the IGBT, thereby solving the adverse problems of large voltage overshoot, poor conduction performance and the like caused by the circuit layout.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:
fig. 1 is a schematic diagram showing a structure of a power module unit according to an embodiment of the present utility model;
fig. 2 shows a schematic circuit topology of a power cell according to an embodiment of the present utility model.
In the drawings, the reference numerals and corresponding part names:
101. an ac output terminal; 102. a DC input terminal; 201. a heat sink; 202. stacking the busbar; 203. a base; 301. IGBT and drive board; 302. a buffer capacitor; 303. a supporting capacitor; 304. resistance of the energy release branch; 305. IGBT of the energy release branch.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present utility model, the present utility model will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present utility model and the descriptions thereof are for illustrating the present utility model only and are not to be construed as limiting the present utility model.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of a power module unit structure according to an embodiment of the present utility model, where, as shown in fig. 1, the power module unit structure includes a plurality of IGBTs, a driving board, a buffer capacitor 302, a heat sink 201, and a base 203;
the heat sink 201 is mounted on the base 203, and the plurality of IGBTs are arranged on a heat dissipation substrate of the heat sink 201, wherein a plurality of heat dissipation fins of the heat sink 201 can slide back and forth along the direction of the heat dissipation substrate so as to adjust the interval between the heat dissipation fins;
one end of the plurality of IGBTs, which is far away from the radiator 201, is detachably connected with the driving plate;
the snubber capacitor 302 is connected in parallel with the plurality of IGBTs, wherein the IGBTs are connected in parallel with the IGBTs.
Specifically, in the embodiment, the power unit with the IGBT as the core component integrates the radiator 201, the cache capacitor, the driving board and the base 203, and the IGBT has good interchangeability as the power element of the inverter in the energy storage system converter, is relatively simple to install, and can better meet the requirements of the fusion device on high power, high performance and high reliability of the power supply system. The driving plate is detachably connected with the IGBT, the radiator 201 is arranged close to the IGBT, and the main source of heat generation of the high-power unit is the IGBT. By providing the IGBT above the heat sink 201, the heat dissipation effect to the IGBT can be further improved.
As shown in fig. 2, in one embodiment, the plurality of IGBTs includes a first IGBT, a second IGBT, a third IGBT, and a fourth IGBT; the first IGBT, the second IGBT, the third IGBT, and the fourth IGBT constitute an H bridge (full bridge) circuit.
Specifically, referring to the circuit topology schematic diagram of the power unit shown in fig. 2, the IGBTs 1, 2, 3 and 4 are respectively a first IGBT, a second IGBT, a third IGBT and a fourth IGBT, and it should be understood that, according to the circuit diagram shown in fig. 2, the connection of the poles of the corresponding IGBT transistors is common knowledge of those skilled in the art, so that the connection relationship between the IGBTs is not repeated here.
Accordingly, the H-bridge circuit inverts direct current (from a battery or a capacitor or the like) into alternating current of a certain frequency or variable frequency by turning on and off the IGBTs.
The input end of the high-power module is connected with a transmission cable, the transmission cable is connected with a capacitor energy storage end, which is common knowledge of an electric power energy storage system, such as hydropower, wind power, thermal power, nuclear power and the like, so that the arrangement of the energy storage system is realized, and the functions of charging and discharging energy storage media, power control and the like of the energy storage system are realized.
In one embodiment, the power module unit structure further includes a stacked busbar 202 connected to the driving board, and the buffer capacitor 302 is connected in parallel to the plurality of IGBTs through the stacked busbar 202;
the alternating current output terminal 101 of the laminated busbar 202 is connected with the output end of each IGBT;
the dc input terminal 102 of the laminated busbar 202 is connected to the input of each IGBT.
As shown in fig. 1, the circuit stray inductance is minimized because the physical structure of the circuitry inside the power cell should be minimized as the current and frequency increase. Therefore, the present embodiment can make the circuit layout as tight, compact and symmetrical as possible by connecting the IGBTs using the stacked busbar 202, so as to solve the adverse problems of large voltage overshoot, poor conduction performance and the like caused by the circuit layout.
The first IGBT and the second IGBT are connected in series by the laminated busbar at one layer of busbar, the third IGBT and the fourth IGBT are connected in series, and then the first IGBT and the second IGBT are connected in parallel to form an H-bridge circuit.
Since the IGBT will generate a higher surge voltage at the turn-off instant, which affects the operating state of the IGBT itself, in order to improve the reliability of the IGBT, the parallel buffer capacitors are required to suppress the excessive turn-off voltage, so as to ensure that the device operates in a safe operating area, and in one embodiment, the number of buffer capacitors 302 is equal to the number of IGBTs.
Here, it is explained why the number of snubber capacitances 302 is equal to the number of IGBTs.
In one embodiment, a supporting capacitor 303 is disposed between the laminated busbar 202 and the base 203, and the supporting capacitor 303 is connected in parallel with the plurality of IGBTs through the laminated busbar 202.
Because the filter circuit of the high-power unit in the prior art is a capacitance absorption circuit, the absorption circuit adopts a thin film capacitor, and the absorption circuit must be close to an IGBT during installation, the circuit is simple and the cost is low, so that the power module of the embodiment adopts a laminated busbar to connect the IGBT and the direct-current support capacitor 303, so that the stray inductance of a circuit is small, the buffer circuit cannot oscillate with the parasitic inductance of a direct-current bus of a power system, and the whole volume of the power unit is reduced.
Accordingly, the base 203 may be made of an aluminum alloy material having excellent corrosion resistance, wear resistance and heat resistance, and may effectively prevent contaminants from entering the inside, thereby protecting the safety of the power module unit. In addition, the aluminum alloy material has higher strength, and can effectively prevent external vibration and impact, thereby protecting the stability of the power module unit.
In one embodiment, the supporting capacitor 303 is a dc supporting capacitor 303.
The DC link supporting capacitor 303 (DC supporting capacitor 303 for short) is used to support a DC network, and since the direct current directly output by the rectifying circuit is somewhat similar to a steamed bread wave, the circuit fluctuation of the DC link supporting capacitor 303 is improved, and the larger the capacitance of the DC link supporting capacitor is, the smaller the voltage fluctuation of the DC bus is. And when the load has periodic peak current demand, the supporting capacitor 303 will briefly supply large current to maintain the output stable.
Therefore, the dc supporting capacitor 303 has the functions of both a filter capacitor (with smooth waveform) and an energy storage capacitor (providing transient high current requirement).
In one embodiment, the dc output end of the laminated busbar 202 is further connected to an energy release branch; the energy release branch is connected with the IGBTs in parallel.
The energy release branch circuit is used for releasing the redundant energy stored by the direct-current end energy storage device and the supporting capacitor, so that the safety of overhaul and maintenance is ensured.
In one embodiment, the energy release branch is formed by connecting an IGBT and a resistor in series.
In yet another embodiment of the present utility model, a current transformer is provided, which includes a power module unit structure as described in the foregoing embodiment.
Specifically, the complete energy storage system comprises two parts: the energy storage device consists of various energy storage media and auxiliary control monitoring equipment thereof, and mainly realizes energy storage and monitoring; and the energy storage power conversion system (Power Conversion System PCS) is mainly composed of power electronic devices and is mainly responsible for realizing the functions of charging and discharging of an energy storage medium, power control and the like of the energy storage system.
Therefore, the present embodiment provides a power module unit structure based on the above embodiments as a minimum base unit
In still another embodiment of the present utility model, there is further provided an energy storage power conversion system including a converter as described in the foregoing embodiment, or a power module unit structure as described in the foregoing embodiment.
The energy storage converter is used as key equipment in an energy storage power conversion system, and energy storage and release are realized through bidirectional conversion of alternating current and direct current. The power unit of the energy storage converter is used as a core component of the energy storage converter, and an IGBT (Insulated Gated Bipolar Transistor, insulated gate bipolar transistor) module is adopted, so that the device loss can be effectively reduced, and the conversion efficiency of the converter is improved.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (10)
1. The power module unit structure is characterized by comprising a plurality of IGBTs, a driving plate, a buffer capacitor, a radiator and a base;
the radiator is arranged on the base, the IGBTs are arranged on a radiating substrate of the radiator, and the radiating fins of the radiator can slide back and forth along the direction of the radiating substrate so as to adjust the spacing between the radiating fins;
one end, far away from the radiator, of the plurality of IGBTs is detachably connected with the driving plate;
the snubber capacitor is connected in parallel with the plurality of IGBTs, wherein the IGBTs are connected in parallel with the IGBTs.
2. The power module cell structure of claim 1, wherein the plurality of IGBTs includes a first IGBT, a second IGBT, a third IGBT, and a fourth IGBT;
the first IGBT, the second IGBT, the third IGBT and the fourth IGBT form an H-bridge circuit.
3. The power module cell structure according to claim 1, further comprising a laminated busbar connected to the drive board, the snubber capacitor being connected in parallel with the plurality of IGBTs through the laminated busbar;
the direct current input terminal of the laminated busbar is connected with the input end of each IGBT;
and the alternating current output terminal of the laminated busbar is connected with the output end of each IGBT.
4. A power module cell structure according to claim 3, wherein the number of snubber capacitances is equal to the number of IGBTs.
5. A power module cell structure according to claim 3, wherein a support capacitor is provided between the laminated busbar and the base, the support capacitor being connected in parallel with the plurality of IGBTs through the laminated busbar.
6. The power module cell structure of claim 5 wherein the support capacitor is a dc support capacitor.
7. A power module unit structure according to claim 3, wherein the dc output end of the laminated busbar is further connected with an energy release branch;
the energy release branch is connected with the IGBTs in parallel.
8. A power module cell structure according to claim 7, wherein said energy release branch is formed by a series connection of an IGBT and a resistor.
9. A current transformer comprising a power module cell structure according to any one of claims 1 to 8.
10. An energy storage power conversion system comprising a current transformer as claimed in claim 9 or a power module cell structure as claimed in any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321492197.6U CN220122785U (en) | 2023-06-12 | 2023-06-12 | Power module unit structure, converter and energy storage power conversion system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321492197.6U CN220122785U (en) | 2023-06-12 | 2023-06-12 | Power module unit structure, converter and energy storage power conversion system |
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| CN220122785U true CN220122785U (en) | 2023-12-01 |
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| CN202321492197.6U Active CN220122785U (en) | 2023-06-12 | 2023-06-12 | Power module unit structure, converter and energy storage power conversion system |
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