CN201869115U - Solar photovoltaic synchronization group micro inverter - Google Patents
Solar photovoltaic synchronization group micro inverter Download PDFInfo
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- CN201869115U CN201869115U CN2010206280111U CN201020628011U CN201869115U CN 201869115 U CN201869115 U CN 201869115U CN 2010206280111 U CN2010206280111 U CN 2010206280111U CN 201020628011 U CN201020628011 U CN 201020628011U CN 201869115 U CN201869115 U CN 201869115U
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model provides a solar photovoltaic synchronization group micro inverter comprising a plurality of independent conversion circuits and a sharing circuit that is connected with the plurality of independent conversion circuits respectively, wherein the sharing circuit comprises a reference current dead zone control module that is used for enabling all reference current dead zones of the plurality of independent conversion circuits to be aligned. In the solar photovoltaic synchronization group micro inverter, the plurality of independent conversion circuits shares one sharing circuit, so that the quantity of the sharing circuit in the circuit of the whole micro inverter is decreased, the production cost of a solar photovoltaic synchronization power generation system is lowered, the installation and maintenance are convenient, the reliability is increased, and the direct current-alternating current conversion efficiency is also improved. In addition, the time of all reference current dead zones of the plurality of independent conversion circuits can be aligned by utilizing a direct current-alternating current inversion method, so that the phases of all the reference currents are the same, and further output matched with the current of a power grid can be generated.
Description
Technical field
The utility model relates to the photovoltaic sciemtifec and technical sphere, specifically, relates to the little inverter of a kind of solar photovoltaic grid-connection group.
Background technology
In the photovoltaic sciemtifec and technical sphere, usually need to use the little inverter of solar photovoltaic grid-connection the direct current power of each photovoltaic module acquisition of solar cell to be converted to the alternating electromotive force of the output of can being incorporated into the power networks, and each photovoltaic module is carried out the optimization of electric power output, for example MPPT maximum power point tracking etc.
Fig. 1 is the structured flowchart of the little inverter of solar photovoltaic grid-connection list of prior art.As shown in the figure, single little inverter 100 generally is made of DC voltage booster circuit 101 and ac conversion circuit 103, wherein DC voltage booster circuit 101 is used for DC input voitage is raise, and the DC input voitage that ac conversion circuit 103 is used for raising converts ac output voltage to, to wait the output of being incorporated into the power networks.DC voltage booster circuit 101 can comprise DC-to-DC change-over circuit 105, DC control circuit 107 and dc detection circuit 109.Ac conversion circuit 103 can comprise alternating current circuit 1011, data processor 1013, telecommunication circuit 1015 and parallel network circuit 1017.Wherein, alternating current circuit 1011 can also comprise dc-ac conversion circuit 1019, AC control circuit 1021 and AC detection circuit 1023.
Because the little inverter of existing list generally is ac conversion circuit of a DC voltage booster circuit correspondence, the little inverter of list that whole like this solar energy grid-connected photovoltaic system just needs One's name is legion makes that the whole system cost is very high and inconvenience is installed.In addition, because corresponding ac conversion circuit of DC voltage booster circuit in the little inverter of existing list, but DC voltage booster circuit only accounts for the sub-fraction of whole little inverter circuit, and ac conversion circuit occupies the major part of whole little inverter circuit, make that the energy of whole solar energy grid-connected photovoltaic system loss on the ac conversion circuit of each single little inverter is more, reduced the conversion efficiency of the DC-AC of whole solar energy grid-connected photovoltaic system.
In addition, for little inverter that is incorporated into the power networks, in order to produce the output of mating with power network current, usually the direct current of the little inverter of detection is imported and is exchanged output, produce reference current by calculating, again reference current is offered DC control circuit, thereby produce the output of mating with power network current.In order to make direct current to the change-over circuit operate as normal that exchanges, reference current has one section dead band, does not have electric current.For the little inverter of group that a plurality of DC voltage booster circuit are arranged, the dead band after multichannel merges is the common factor in multichannel dead band.When the Dead Time mismatch of multichannel, the dead band after it merges can influence the operate as normal of direct current to the change-over circuit of interchange less than the dead band on each road.
Summary of the invention
Technical problem to be solved in the utility model provides the little inverter of a kind of solar photovoltaic grid-connection group, share a shared circuit (being ac conversion circuit) by a plurality of independent translation circuit (being DC voltage booster circuit), reduce the quantity of sharing circuit in whole little inverter circuit, reduce solar energy grid-connected photovoltaic system cost, be convenient to installation and maintenance and increased reliability again, also improve the whole conversion efficiency of DC-AC, the ac output current of generation can be complementary with power network current.
For solving the problems of the technologies described above, the utility model provides a kind of solar photovoltaic grid-connection group little inverter, comprising:
A plurality of independent translation circuit are used for DC input voitage is raise;
A shared circuit is connected with described a plurality of independent translation circuit respectively, is used for converting the DC input voitage of described rising to ac output voltage, to wait the output of being incorporated into the power networks;
Described shared circuit comprises reference current dead band control module, is used for the dead band aligning with each reference current of described a plurality of independent translation circuit.
Alternatively, described independent translation circuit comprises:
The DC-to-DC change-over circuit is connected with the direct current input source;
DC control circuit is connected with described reference current dead band control module with described DC-to-DC change-over circuit respectively; And
Dc detection circuit is connected with described reference current dead band control module with described DC-to-DC change-over circuit respectively.
Alternatively, described shared circuit also comprises:
Dc-ac conversion circuit is connected with each DC-to-DC change-over circuit of described a plurality of independent translation circuit respectively;
AC control circuit is connected with described reference current dead band control module with described dc-ac conversion circuit respectively;
AC detection circuit is connected with described reference current dead band control module with described dc-ac conversion circuit respectively;
Parallel network circuit is connected with electrical network with described dc-ac conversion circuit respectively; And
Telecommunication circuit is connected with described dc-ac conversion circuit with described reference current dead band control module respectively.
Alternatively, the number of described independent translation circuit is 2～8.
The utility model also provides a kind of method of utilizing the above-mentioned little inverter of solar photovoltaic grid-connection group to carry out the DC-AC inversion, comprises step:
The direct current input current of a plurality of independent translation circuit is converted to ac output current;
Detect the direct current input current and the ac output current of described a plurality of independent translation circuit respectively, calculate the reference current and the Dead Time thereof of each independent translation circuit;
Calculate deviation between described each Dead Time according to described each reference current and Dead Time thereof;
Adjust the calculating parameter of described each reference current, eliminate the deviation between the Dead Time of reference current of described a plurality of independent translation circuit;
The ac output current merging back of described a plurality of independent translation circuit is exported to electrical network.
The utility model also provides a kind of method of utilizing the above-mentioned little inverter of solar photovoltaic grid-connection group to carry out the DC-AC inversion, comprises step:
The direct current input current of a plurality of independent translation circuit is converted to ac output current;
Provide same reference current phase place to described a plurality of independent translation circuit;
The ac output current merging back of described a plurality of independent translation circuit is exported to electrical network.
Compared with prior art, the utlity model has following advantage:
The utility model is by sharing a plurality of independent translation circuit with a shared circuit, form the little inverter of group, its effect is equivalent to the summation of the effect of the little inverter of a plurality of lists, but because the little inverter of group has been cut down the quantity of sharing circuit in whole little inverter circuit, reduced solar energy grid-connected photovoltaic system production cost, be convenient to installation and maintenance and increased reliability again, also improved the whole conversion efficiency of DC-AC.
In addition, the method of solar photovoltaic grid-connection DC-AC of the present utility model inversion can be aimed at the Dead Time of the reference current of a plurality of independent translation circuit, the phase place that makes its each reference current is identical, and the little inverter of group can produce the output that is complementary with power network current thus.
Description of drawings
The above and other feature of the present utility model, character and advantage will become more obvious by the description below in conjunction with drawings and Examples, in the accompanying drawings, identical Reference numeral is represented identical feature all the time, wherein:
Fig. 1 is the structured flowchart of the little inverter of solar photovoltaic grid-connection list of prior art;
Fig. 2 is the simple block diagram of the two little inverters of solar photovoltaic grid-connection of an embodiment of the utility model;
Fig. 3 is the structured flowchart of the two little inverters of solar photovoltaic grid-connection of an embodiment of the utility model;
Fig. 4 is the method flow diagram of the solar photovoltaic grid-connection DC-AC inversion of an embodiment of the utility model;
Fig. 5 is the signal schematic representation in reference current dead band of two independent translation circuit of the little inverter of alignment solar photovoltaic grid-connection group of an embodiment of the utility model;
Fig. 6 is the method flow diagram of the solar photovoltaic grid-connection DC-AC inversion of another embodiment of the utility model.
Embodiment
The utility model is described in further detail below in conjunction with specific embodiments and the drawings, but should not limit protection range of the present utility model with this.
Fig. 2 is the simple block diagram of the two little inverters of solar photovoltaic grid-connection of an embodiment of the utility model.As shown in the figure, the little inverter 200 of this pair can comprise:
Two independent translation circuit 206 are used for DC input voitage 202 is raise;
A shared circuit 208 is connected with two independent translation circuit 206 respectively, and the DC input voitage 202 that is used for raising converts ac output voltage 204 to, to wait the output of being incorporated into the power networks;
Wherein, share circuit 208 and can comprise reference current dead band control module (not shown), be used for dead band aligning each reference current of two independent translation circuit 206.
Fig. 3 is the structured flowchart of the two little inverters of solar photovoltaic grid-connection of an embodiment of the utility model.As shown in the figure, the independent translation circuit 206 in the little inverter 200 of this pair can comprise:
DC-to-DC change-over circuit 205,205 ' is connected with the direct current input source;
DC control circuit 207,207 ' is connected with reference current dead band control module 2013 with DC-to-DC change-over circuit 205,205 ' respectively; And
Dc detection circuit 209,209 ' is connected with reference current dead band control module 2013 with DC-to-DC change-over circuit 205,205 ' respectively.
Shared circuit 208 in the little inverter 200 of this pair can comprise:
Reference current dead band control module 2013 is used for the dead band aligning with the reference current of two independent translation circuit 206;
Dc-ac conversion circuit 2019 is connected with the DC-to-DC change-over circuit 205,205 ' of two independent translation circuit 206 respectively;
Wherein, dc-ac conversion circuit 2019, AC control circuit 2021 and the AC detection circuit of sharing in the circuit 208 2023 can constitute alternating current circuit 2011 together.
In the utility model, the number of independent translation circuit can be 2～8.
Fig. 4 is the method flow diagram of the solar photovoltaic grid-connection DC-AC inversion of an embodiment of the utility model.As shown in the figure, this method can comprise:
Execution in step S401 is converted to ac output current with the direct current input current of a plurality of independent translation circuit;
Execution in step S402 detects the direct current input current and the ac output current of a plurality of independent translation circuit respectively, calculates the reference current and the Dead Time thereof of each independent translation circuit;
Execution in step S403 calculates deviation between each Dead Time according to each reference current and Dead Time thereof;
Fig. 5 is the signal schematic representation in reference current dead band of two independent translation circuit of alignment of an embodiment of the utility model.As shown in the figure, there is the first deviation tf in the Dead Time 503 on the first row reference current B waveform right side, left side with respect to the Dead Time 501 on reference current A waveform right side.In addition, there is the second deviation tr in the Dead Time in reference current B waveform left side with respect to the Dead Time in reference current A waveform left side.Because the existence of above-mentioned deviation tf, tr, make the Dead Time of the reference current C that obtains by reference current A and reference current B addition equally also can have the first deviation tf to the right, have second a deviation tr left, make the Dead Time 505 of reference current C less than its theoretical value, need to adjust the Dead Time of reference current B for this reason.
Execution in step S404 adjusts the calculating parameter of each reference current, eliminates the deviation between the Dead Time of reference current of a plurality of independent translation circuit;
Execution in step S405 exports the ac output current merging back of a plurality of independent translation circuit to electrical network.
In Fig. 5, can be by adjusting the calculating parameter of reference current B, the phase place on reference current B waveform right side is moved to the left the first deviation tf, the phase place in waveform left side is moved to the left the second deviation tr, make reference current A, reference current B aim at fully with the phase place of the reference current C that obtains by reference current A and reference current B addition, eliminate the deviation between the Dead Time of reference current A, B of these two independent translation circuit, thereby produce the output with the power network current coupling.
In the present embodiment, calculate each independent translation circuit reference current and the deviation between Dead Time and each Dead Time thereof, adjust the calculating parameter of each reference current, can finish by reference current dead band control module with the deviation between the Dead Time of the reference current of eliminating a plurality of independent translation circuit.
Fig. 6 is the method flow diagram of the solar photovoltaic grid-connection DC-AC inversion of another embodiment of the utility model.As shown in the figure, this method can comprise:
Execution in step S601 is converted to ac output current with the direct current input current of a plurality of independent translation circuit;
Execution in step S602 provides same reference current phase place to a plurality of independent translation circuit;
Execution in step S603 exports the ac output current merging back of a plurality of independent translation circuit to electrical network.
In the present embodiment, can produce same reference current phase place, offer a plurality of independent translation circuit simultaneously to produce each reference current by reference current dead band control module.Like this, the dead band of these reference currents alignment.
The utility model is by sharing a plurality of independent translation circuit with a shared circuit, form the little inverter of group, its effect is equivalent to the summation of the effect of the little inverter of a plurality of lists, but because the little inverter of group has been cut down the quantity of sharing circuit in whole little inverter circuit, reduced solar energy grid-connected photovoltaic system production cost, be convenient to installation and maintenance and increased reliability again, also improved the whole conversion efficiency of DC-AC.
In addition, the method of solar photovoltaic grid-connection DC-AC of the present utility model inversion can be aimed at the Dead Time of the reference current of a plurality of independent translation circuit, the phase place that makes its each reference current is identical, and the little inverter of group can produce the output that is complementary with power network current thus.
Though the utility model with preferred embodiment openly as above; but it is not to be used for limiting the utility model; any those skilled in the art are not in breaking away from spirit and scope of the present utility model; can make possible change and modification, therefore protection range of the present utility model should be as the criterion with the scope that the utility model claim is defined.
Claims (4)
1. little inverter of solar photovoltaic grid-connection group comprises:
A plurality of independent translation circuit are used for DC input voitage is raise;
A shared circuit is connected with described a plurality of independent translation circuit respectively, is used for converting the DC input voitage of described rising to ac output voltage, to wait the output of being incorporated into the power networks;
Described shared circuit comprises reference current dead band control module, is used for the dead band aligning with each reference current of described a plurality of independent translation circuit.
2. the little inverter of solar photovoltaic grid-connection group according to claim 1 is characterized in that, described independent translation circuit comprises:
The DC-to-DC change-over circuit is connected with the direct current input source;
DC control circuit is connected with described reference current dead band control module with described DC-to-DC change-over circuit respectively; And
Dc detection circuit is connected with described reference current dead band control module with described DC-to-DC change-over circuit respectively.
3. the little inverter of solar photovoltaic grid-connection group according to claim 2 is characterized in that, described shared circuit also comprises:
Dc-ac conversion circuit is connected with each DC-to-DC change-over circuit of described a plurality of independent translation circuit respectively;
AC control circuit is connected with described reference current dead band control module with described dc-ac conversion circuit respectively;
AC detection circuit is connected with described reference current dead band control module with described dc-ac conversion circuit respectively;
Parallel network circuit is connected with electrical network with described dc-ac conversion circuit respectively; And
Telecommunication circuit is connected with described dc-ac conversion circuit with described reference current dead band control module respectively.
4. the little inverter of solar photovoltaic grid-connection group according to claim 1 is characterized in that the number of described independent translation circuit is 2～8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206280111U CN201869115U (en) | 2010-11-25 | 2010-11-25 | Solar photovoltaic synchronization group micro inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206280111U CN201869115U (en) | 2010-11-25 | 2010-11-25 | Solar photovoltaic synchronization group micro inverter |
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| Publication Number | Publication Date |
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| CN201869115U true CN201869115U (en) | 2011-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206280111U Expired - Lifetime CN201869115U (en) | 2010-11-25 | 2010-11-25 | Solar photovoltaic synchronization group micro inverter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118116A (en) * | 2010-11-25 | 2011-07-06 | 浙江昱能光伏科技集成有限公司 | Solar photovoltaic synchronization group micro-inverter and direct current and alternating current inverting methods |
| CN102496955A (en) * | 2011-11-24 | 2012-06-13 | 浙江昱能光伏科技集成有限公司 | Intelligent photovoltaic system and method for data detection and transmission |
| WO2013004110A1 (en) * | 2011-07-05 | 2013-01-10 | 浙江昱能光伏科技集成有限公司 | Solar photovoltaic grid-connected interleaved parallel flyback inverter |
-
2010
- 2010-11-25 CN CN2010206280111U patent/CN201869115U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118116A (en) * | 2010-11-25 | 2011-07-06 | 浙江昱能光伏科技集成有限公司 | Solar photovoltaic synchronization group micro-inverter and direct current and alternating current inverting methods |
| CN102118116B (en) * | 2010-11-25 | 2013-02-13 | 浙江昱能光伏科技集成有限公司 | Solar photovoltaic synchronization group micro-inverter and direct current and alternating current inverting methods |
| WO2013004110A1 (en) * | 2011-07-05 | 2013-01-10 | 浙江昱能光伏科技集成有限公司 | Solar photovoltaic grid-connected interleaved parallel flyback inverter |
| CN102496955A (en) * | 2011-11-24 | 2012-06-13 | 浙江昱能光伏科技集成有限公司 | Intelligent photovoltaic system and method for data detection and transmission |
| CN102496955B (en) * | 2011-11-24 | 2013-12-04 | 浙江昱能光伏科技集成有限公司 | Intelligent photovoltaic system and method for data detection and transmission |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: ZHEJIANG YUNENG TECHNOLOGY CO., LTD. Free format text: FORMER NAME: ALTENERGY POWER SYSTEM INC. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 314050 Jiaxing, South Lake District, Zhejiang, Asia Pacific Road, No. 1 Patentee after: Zhejiang Yuneng Technology Co., Ltd. Address before: 314050 Jiaxing, South Lake District, Zhejiang, Asia Pacific Road, No. 1 Patentee before: Altenergy Power System Inc. |
|
| CP03 | Change of name, title or address |
Address after: 3 / F, building 1, No. 1, Asia Pacific Road (Jiaxing Science and technology city), Nanhu District, Jiaxing City, Zhejiang Province Patentee after: Yuneng Technology Co., Ltd Address before: 314050 No. 1 Asia Pacific Road, Nanhu District, Zhejiang, Jiaxing Patentee before: Zhejiang Yuneng Technology Co.,Ltd. |
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| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110615 |
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| CX01 | Expiry of patent term |