CN202679258U - Power unit applied on grid-tied photovoltaic inverter - Google Patents

Power unit applied on grid-tied photovoltaic inverter Download PDF

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Publication number
CN202679258U
CN202679258U CN 201220226879 CN201220226879U CN202679258U CN 202679258 U CN202679258 U CN 202679258U CN 201220226879 CN201220226879 CN 201220226879 CN 201220226879 U CN201220226879 U CN 201220226879U CN 202679258 U CN202679258 U CN 202679258U
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CN
China
Prior art keywords
igbt
grid
capacitance group
power
photovoltaic inverter
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201220226879
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Chinese (zh)
Inventor
臧堪欣
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Billion (tianjin) Technology Co Ltd
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Billion (tianjin) Technology Co Ltd
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Priority to CN 201220226879 priority Critical patent/CN202679258U/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

The utility model provides a power unit applied on a grid-tied photovoltaic inverter, comprising a power stack and a direct current supporting capacitor set which are in connection through a low inductance connection bus; the power stack comprises an IGBT module, and IGBT drive boards, absorption capacitors and low inductance output buses arranged on the IGBT module; the absorption capacitors are in parallel connection with the IGBT module; the direct current supporting capacitor set is composed of a plurality of low inductance film capacitors which are directly in parallel connection; photovoltaic direct current electric energy can be inputted through a low inductance input bus in the front of the direct current supporting capacitor set, and alternating current electric energy can be outputted through a low inductance output bus. The beneficial effects are that according to the technical scheme, the power unit possesses the advantages of a small size, large power, convenience in installation, low failure rate and low costs.

Description

A kind of power cell that is applied in grid-connected photovoltaic inverter
Technical field
The utility model belongs to the photovoltaic combining inverter field, especially relates to a kind of power cell that is applied in grid-connected photovoltaic inverter.
Background technology
At present, at the energy crisis that is on the rise and the biological environment that goes from bad to worse, make countries in the world walk the road of sustainable development according to national conditions, and Devoting Major Efforts To Developing utilize regenerative resource.Solar-photovoltaic technology has entered the fast-developing stage under these circumstances.In solar-photovoltaic technology, photovoltaic combining inverter is the device that the direct current energy that photovoltaic battery panel produces is changed into the AC energy identical with the electrical network index, it is one of core apparatus of photovoltaic plant, and in photovoltaic combining inverter, specifically finishing electric energy is exactly power cell by the device that direct current energy changes AC energy into, and it is again the core apparatus of photovoltaic combining inverter.
In the prior art, each manufacturer's great majority all adopts the IGBT module as power device at present, forms the H bridge circuit and finishes electric energy by the conversion of direct current to alternating current.
Power cell circuit topology sketch is seen Fig. 1:
Wherein C is the DC support capacitance group, Vb1 ... Vb6 is IGBT.
In actual applications, power cell also comprises buffer capacitor and cooling device.
At present, under prior art, because photovoltaic combining inverter power is larger, market needs the technical specifications such as 100KW, 250KW, 500KW, 1MW more, manufacturer's modes that adopt a plurality of low power power cell parallel operations more, do like this and cause the power cell volume large, the shortcoming such as device is many, and is difficult in maintenance.
Photovoltaic combining inverter IGBT when work has large electric current to flow through, cause the device heating amount very large, must adopt and force cooling provision to guarantee when photovoltaic combining inverter works, the temperature rise of DC support capacitance group and IGBT module must be in the scope that device allows.Under the prior art, each manufacturer adopts the technology of air blast cooling to cool off more at present.Air-cooled technology volume is large, dispels the heat inhomogeneous, and radiating effect is poor.
Summary of the invention
Problem to be solved in the utility model provides a kind of power cell that is applied in grid-connected photovoltaic inverter, especially is fit to power output large, the inverter that volume is little.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of power cell that is applied in grid-connected photovoltaic inverter, comprise power storehouse and DC support capacitance group, described power storehouse is connected to connect busbar and connects with the DC support capacitance group, described power storehouse comprises the IGBT module, is directly installed on IGBT drive plate, Absorption Capacitance, low sense output busbar on the described IGBT module, and described Absorption Capacitance and IGBT module are connected in parallel; Described DC support capacitance group is directly composed in parallel by a plurality of low sense thin-film capacitors, and the photovoltaic DC electric energy is by low sense input busbar place's input of DC support capacitance group front end, from low sense output busbar output AC electric energy.
Power storehouse and DC support capacitance group are connected busbar by low stray inductance and connect, and reduce stray inductance in the system by custom-designed low stray inductance busbar as far as possible, avoid producing superpotential fault when IGBT turn-offs, have reduced the failure rate of installing.
Further, in the utility model, adopt high-power high voltage IGBT module, use 6 IGBT to consist of 23 phase H bridge circuits, power output can reach 500KW, and each 3 phase H bridge can power output 250KW.If the power cell that relates in the utility model is used for the 500KW photovoltaic combining inverter, need 6 IGBT are installed, if be used in the photovoltaic combining inverter of 250KW, only need that then 3 IGBT are installed just passable.
Further, described IGBT drive plate adopts light signal control, has reduced device volume, has avoided because the interference that stray inductance and wiring bring has improved control precision.
Further, the side of described IGBT module is provided with liquid cooling heat radiator, the in-built coolant that is useful on cooling of described liquid cooling heat radiator.
The power storehouse adopts the mode of liquid cools, coolant is the mixture of ethylene glycol and pure water, 6 IGBT are installed in respectively on the two sides of liquid cooling heat radiator, share a liquid cooling heat radiator, the heat that produces during IGBT work is taken out of by the coolant that flows in liquid cooling heat radiator, dissipates by the heat exchanger that is installed in the cabinet outside, has saved installation volume, avoided because use air-cooled mode need to design special air channel, so that power cell can miniaturization; Simultaneously, the heat radiation of the type of cooling of liquid cooling has evenly been avoided having improved the reliability of device because the inhomogeneous IGBT of causing of heat radiation inside may local overheating occur and cause fault; And the type of cooling heat dissipation capacity of liquid cooling is larger than air-cooled so that IGBT during by large electric current temperature rise little, the power density of raising, and the availability of IGBT.
Further, described liquid cooling heat radiator is provided with the liquid cooling heat radiator mounting bracket, and the top of described liquid cooling heat radiator mounting bracket is provided with power storehouse guard shield, for the protection of the IGBT drive plate.
Further, be provided with the capacitance group housing on the described DC support capacitance group, described capacitance group housing top is provided with the PC plate, and the hollow space between described capacitance group housing and the PC plate forms air-cooled air channel.The housing of capacitance group and PC plate have consisted of the air channel of air blast cooling, need not design separately in addition the air channel, have heat radiation reliably, and simple advantage is installed.
Further, DC support electric capacity adopts high withstand voltage low sense thin-film capacitor to consist of capacitance group, with the electrochemical capacitor of present application relatively, the long service life of thin-film capacitor, reliable operation has increased the reliability of device.Select high withstand voltage electric capacity directly to compose in parallel capacitance group, to use the series-parallel scheme of a plurality of electric capacity to have the electric capacity of use quantity few with present other producers, saved divider resistance, the advantage that structure is more simple, cost is lower.
Further, described low sense output busbar, low sense connect busbar and low sense input busbar uses custom-designed low stray inductance busbar, has reduced the adverse effect of stray inductance to IGBT, and the reliability of device is further strengthened.
Advantage and the good effect that the utlity model has are: owing to adopting technique scheme, so that the power cell that relates in the utility model has advantages of that volume is little, power large, easily installation, failure rate is low, cost are low.
Description of drawings
Fig. 1 is the power cell circuit topology sketch of prior art
Fig. 2 is that the power storehouse forms structural representation
Fig. 3 is that the DC support capacitance group forms structural representation
Fig. 4 is syndeton block diagram of the present utility model
Fig. 5 is complete installation diagram of the present utility model
Among the figure: 1, power storehouse guard shield, 2, liquid cooling heat radiator mounting bracket, 3, the IGBT drive plate, 4, the IGBT module, 5, Absorption Capacitance, 6, low sense connects busbar, and 7, low sense output busbar, 8, liquid cooling heat radiator, 9, low sense input busbar, 10, capacitance group housing, 11, low sense thin-film capacitor, 12, the PC plate
Embodiment
Shown in Fig. 2,3, the utility model provides a kind of power cell that is applied in grid-connected photovoltaic inverter, comprise power storehouse and DC support capacitance group, described power storehouse is connected low sense and connects busbar 6 connections with the DC support capacitance group, described power storehouse comprises IGBT module 4, is directly installed on IGBT drive plate 3, Absorption Capacitance 5, low sense output busbar 7 on the described IGBT module 4, and described Absorption Capacitance 5 is connected in parallel with IGBT module 4; Described DC support capacitance group is directly composed in parallel by a plurality of low sense thin-film capacitors 11, and the photovoltaic DC electric energy is by the low sense input busbar 9 places input of DC support capacitance group front end, from low sense output busbar 7 output AC electric energy.
Power storehouse and DC support capacitance group are connected busbar 6 by low stray inductance and connect, and reduce stray inductance in the system by custom-designed low stray inductance busbar as far as possible, avoid producing superpotential fault when IGBT turn-offs, have reduced the failure rate of installing.
Further, in the utility model, adopt high-power high voltage IGBT module 4, use 6 IGBT to consist of 23 phase H bridge circuits, power output can reach 500KW, and each 3 phase H bridge can power output 250KW.If the power cell that relates in the utility model is used for the 500KW photovoltaic combining inverter, need 6 IGBT are installed, if be used in the photovoltaic combining inverter of 250KW, only need that then 3 IGBT are installed just passable.
Further, described IGBT drive plate 3 adopts light signal control, has reduced device volume, has avoided because the interference that stray inductance and wiring bring has improved control precision.
Further, the side of described IGBT module 4 is provided with liquid cooling heat radiator 8, the described liquid cooling heat radiator 8 in-built coolants that are useful on cooling.
The power storehouse adopts the mode of liquid cools, coolant is the mixture of ethylene glycol and pure water, 6 IGBT are installed in respectively on the two sides of liquid cooling heat radiator 8, share a liquid cooling heat radiator 8, the heat that produces during IGBT work is taken out of by the coolant that flows in liquid cooling heat radiator, dissipates by the heat exchanger that is installed in the cabinet outside, has saved installation volume, avoided because use air-cooled mode need to design special air channel, so that power cell can miniaturization; Simultaneously, the heat radiation of the type of cooling of liquid cooling has evenly been avoided having improved the reliability of device because the inhomogeneous IGBT of causing of heat radiation inside may local overheating occur and cause fault; And the type of cooling heat dissipation capacity of liquid cooling is larger than air-cooled so that IGBT during by large electric current temperature rise little, the power density of raising, and the availability of IGBT.
Further, described liquid cooling heat radiator 8 is provided with liquid cooling heat radiator mounting bracket 2, and the top of described liquid cooling heat radiator mounting bracket 2 is provided with power storehouse guard shield 1, for the protection of IGBT drive plate 3.
Further, the housing 10 of capacitance group and PC plate 12 have consisted of the air channel of air blast cooling, need not design separately in addition the air channel, have heat radiation reliably, and simple advantage is installed.
Further, DC support electric capacity adopts high withstand voltage low sense thin-film capacitor 11 to consist of capacitance group, with the electrochemical capacitor of present application relatively, the long service life of thin-film capacitor, reliable operation has increased the reliability of device.Select high withstand voltage electric capacity directly to compose in parallel capacitance group, to use the series-parallel scheme of a plurality of electric capacity to have the electric capacity of use quantity few with present other producers, saved divider resistance, the advantage that structure is more simple, cost is lower.
Further, described low sense output busbar 7, low sense connect busbar 6 and low sense input busbar 9 uses custom-designed low stray inductance busbar, has reduced the adverse effect of stray inductance to IGBT, and the reliability of device is further strengthened.
The course of work of this example: direct current photovoltaic electric energy changes AC energy into by the output of low stray inductance output busbar by low stray inductance direct current input through DC support capacitance group and power storehouse.
Above an embodiment of the present utility model is had been described in detail, but described content only is preferred embodiment of the present utility model, can not be considered to be used to limiting practical range of the present utility model.All equalizations of doing according to the utility model application range change and improve etc., all should still belong within the patent covering scope of the present utility model.

Claims (9)

1. power cell that is applied in grid-connected photovoltaic inverter, it is characterized in that: comprise power storehouse and DC support capacitance group, described power storehouse is connected low sense and connects busbar (6) connection with the DC support capacitance group, described power storehouse comprises IGBT module (4), is directly installed on IGBT drive plate (3), Absorption Capacitance (5), low sense output busbar (7) on the described IGBT module (4), and described Absorption Capacitance (5) is connected in parallel with IGBT module (4); Described DC support capacitance group is directly composed in parallel by a plurality of low sense thin-film capacitors (11), and the photovoltaic DC electric energy is located input by the low sense input busbar (9) of DC support capacitance group front end, from low sense output busbar (7) output AC electric energy.
2. a kind of power cell that is applied in grid-connected photovoltaic inverter according to claim 1, it is characterized in that: described IGBT module (4) is high-power high voltage IGBT module.
3. a kind of power cell that is applied in grid-connected photovoltaic inverter according to claim 1, it is characterized in that: described IGBT module (4) comprises 3 IGBT, described 3 IGBT form 13 phase H bridge circuit.
4. a kind of power cell that is applied in grid-connected photovoltaic inverter according to claim 1, it is characterized in that: described IGBT module (4) comprises 6 IGBT, described 6 IGBT form 23 phase H bridge circuits.
5. a kind of power cell that is applied in grid-connected photovoltaic inverter according to claim 1 is characterized in that: the control of described IGBT drive plate (3) employing light signal.
6. a kind of power cell that is applied in grid-connected photovoltaic inverter according to claim 1, it is characterized in that: the side of described IGBT module (4) is provided with liquid cooling heat radiator (8), the in-built coolant that is useful on cooling of described liquid cooling heat radiator (8).
7. a kind of power cell that is applied in grid-connected photovoltaic inverter according to claim 6, it is characterized in that: described liquid cooling heat radiator (8) is provided with liquid cooling heat radiator mounting bracket (2), and the top of described liquid cooling heat radiator mounting bracket (2) is provided with power storehouse guard shield (1).
8. the described a kind of power cell that is applied in grid-connected photovoltaic inverter of any one according to claim 1-7, it is characterized in that: be provided with capacitance group housing (10) on the described DC support capacitance group, described capacitance group housing (10) top is provided with PC plate (12), and the hollow space between described capacitance group housing (10) and the PC plate (12) forms air-cooled air channel.
9. the described a kind of power cell that is applied in grid-connected photovoltaic inverter of any one is characterized in that: the low sense of described DC support capacitance group employing thin-film capacitor formation capacitance group according to claim 1-7.
CN 201220226879 2012-05-18 2012-05-18 Power unit applied on grid-tied photovoltaic inverter Expired - Fee Related CN202679258U (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103795270A (en) * 2014-01-16 2014-05-14 北京能高自动化技术股份有限公司 Water-cooled photovoltaic inverter
CN103956885A (en) * 2014-04-24 2014-07-30 江苏大全箱变科技有限公司 Compact power unit of wind power converter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103795270A (en) * 2014-01-16 2014-05-14 北京能高自动化技术股份有限公司 Water-cooled photovoltaic inverter
CN103795270B (en) * 2014-01-16 2017-01-04 北京能高自动化技术股份有限公司 A kind of water-cooled photovoltaic DC-to-AC converter
CN103956885A (en) * 2014-04-24 2014-07-30 江苏大全箱变科技有限公司 Compact power unit of wind power converter

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130116

Termination date: 20160518