CN102118116B - Solar photovoltaic synchronization group micro-inverter and direct current and alternating current inverting methods - Google Patents
Solar photovoltaic synchronization group micro-inverter and direct current and alternating current inverting methods Download PDFInfo
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- CN102118116B CN102118116B CN2010105616007A CN201010561600A CN102118116B CN 102118116 B CN102118116 B CN 102118116B CN 2010105616007 A CN2010105616007 A CN 2010105616007A CN 201010561600 A CN201010561600 A CN 201010561600A CN 102118116 B CN102118116 B CN 102118116B
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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
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Abstract
The invention provides a solar photovoltaic synchronization group micro-inverter comprising a plurality of independent switching circuits and a sharing circuit, wherein the sharing circuit is respectively connected with the plurality of independent switching circuits and comprises a standard-current dead zone control module which is used for aligning with each standard-current dead zone of the independent switching circuits. The invention also provides two solar photovoltaic synchronization direct current and alternating current inverting methods. The plurality of independent switching circuits share one sharing circuit so that the quantity of the sharing circuits in the whole micro-inverter circuit is reduced, the production cost of a solar photovoltaic synchronization generating system is lowered, the solar photovoltaic synchronization group micro-inverter is convenient to install and maintain, the reliability is increased, and the direct current and alternating current switching efficiency is also increased. Besides, in the direct current and alternating current inverting methods, the standard-current dead zones of the plurality of independent switching circuits can be aligned to ensure that standard currents have same phases, and therefore, an output matched with the current of a power grid can be generated.
Description
Technical field
The present invention relates to the photovoltaic sciemtifec and technical sphere, specifically, relate to the method for the little inverter of a kind of solar photovoltaic grid-connection group and DC-AC inversion.
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, such as 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 is so 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, so 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 inputted 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 normal operation 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 less than the dead band on each road, affect direct current to the normal operation of the change-over circuit of interchange.
Summary of the invention
Technical problem to be solved by this invention provides the method for the little inverter of a kind of solar photovoltaic grid-connection group and DC-AC inversion, 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 again reliability, 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 invention provides the little inverter of a kind of solar photovoltaic grid-connection group, 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 present invention 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 respectively direct current input current and the ac output current of described a plurality of independent translation circuit, calculate 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 of described a plurality of independent translation circuit is merged backward electrical network output.
The present invention 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 of described a plurality of independent translation circuit is merged backward electrical network output.
Compared with prior art, the present invention has the following advantages:
The present invention 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 again reliability, also improved the whole conversion efficiency of DC-AC.
In addition, the method of solar photovoltaic grid-connection DC-AC of the present invention 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 features of the present invention, character and advantage will become more obvious by the description below in conjunction with drawings and Examples, in the accompanying drawings, identical Reference numeral represents 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 one embodiment of the invention;
Fig. 3 is the structured flowchart of the two little inverters of solar photovoltaic grid-connection of one embodiment of the invention;
Fig. 4 is the method flow diagram of the solar photovoltaic grid-connection DC-AC inversion of one embodiment of the invention;
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 one embodiment of the invention;
Fig. 6 is the method flow diagram of the solar photovoltaic grid-connection DC-AC inversion of another embodiment of the present invention.
Embodiment
The invention will be further described below in conjunction with specific embodiments and the drawings, but should not limit protection scope of the present invention with this.
Fig. 2 is the simple block diagram of the two little inverters of solar photovoltaic grid-connection of one embodiment of the invention.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 the dead band aligning with 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 one embodiment of the invention.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 2023 shared in the circuit 208 can consist of alternating current circuit 2011 together.
In the present invention, 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 one embodiment of the invention.As shown in the figure, the 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 respectively direct current input current and the ac output current of a plurality of independent translation circuit, calculates 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 one embodiment of the invention.As shown in the figure, there is the first deviation tf in the Dead Time 503 on left side first row reference current B waveform right 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, so that equally also can there be the first deviation tf to the right in the Dead Time of the reference current C that is obtained by reference current A and reference current B addition, has the second deviation tr left, so that the Dead Time 505 of reference current C needs to adjust the Dead Time of reference current B less than its theoretical value 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 merges backward electrical network output with the ac output current of a plurality of independent translation circuit.
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, so that reference current A, reference current B aim at fully with the phase place of the reference current C that is obtained 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 be finished 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 present invention.As shown in the figure, the 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 merges backward electrical network output with the ac output current of a plurality of independent translation circuit.
In the present embodiment, can produce same reference current phase place by reference current dead band control module, offer simultaneously a plurality of independent translation circuit to produce each reference current.Like this, the dead band of these reference currents alignment.
The present invention 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 again reliability, also improved the whole conversion efficiency of DC-AC.
In addition, the method of solar photovoltaic grid-connection DC-AC of the present invention 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.
Although the present invention with preferred embodiment openly as above; but it is not to limit the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that claim of the present invention was defined.
Claims (6)
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, be used for first reference current and the Dead Time thereof that calculates each independent translation circuit by direct current input current and the ac output current of described a plurality of independent translation circuit, then calculate deviation between described each Dead Time according to described each reference current and Dead Time thereof, adjust at last 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; Perhaps be used for directly providing same reference current phase place to described a plurality of independent translation circuit, the dead band of each reference current of described a plurality of independent translation circuit is aimed at.
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.
5. one kind is utilized the method that the little inverter of each described solar photovoltaic grid-connection group carries out the DC-AC inversion in the claim 1～4, comprises step:
The direct current input current of a plurality of independent translation circuit is converted to ac output current;
Detect respectively direct current input current and the ac output current of described a plurality of independent translation circuit, calculate 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 of described a plurality of independent translation circuit is merged backward electrical network output.
6. one kind is utilized the method that the little inverter of each described solar photovoltaic grid-connection group carries out the DC-AC inversion in the claim 1～4, 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 of described a plurality of independent translation circuit is merged backward electrical network output.
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| CN102882414A (en) * | 2012-09-26 | 2013-01-16 | 浙江昱能光伏科技集成有限公司 | Off-grid direct-current-to-alternating-current system |
| CN102969739B (en) * | 2012-12-10 | 2014-09-24 | 浙江昱能科技有限公司 | DC-AC (direct current to alternating current) power conversion device |
| CN104518694A (en) * | 2013-09-26 | 2015-04-15 | 台达电子工业股份有限公司 | Micro inverter of solar power generation system, and operation method thereof |
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| CN101841252A (en) * | 2010-05-11 | 2010-09-22 | 英伟力新能源科技(上海)有限公司 | Photovoltaic grid-connected inverter for active energy decoupling |
| CN201869115U (en) * | 2010-11-25 | 2011-06-15 | 浙江昱能光伏科技集成有限公司 | Solar photovoltaic synchronization group micro inverter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001255949A (en) * | 2000-03-13 | 2001-09-21 | Toshiba Corp | Photovoltaic power generating inverter device |
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Patent Citations (3)
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| DE19919766A1 (en) * | 1999-04-29 | 2000-11-02 | Sma Regelsysteme Gmbh | Inverter for a photovoltaic unit for use in a solar generator to maximize the power/performance output, the so-called maximum power point tracking |
| CN101841252A (en) * | 2010-05-11 | 2010-09-22 | 英伟力新能源科技(上海)有限公司 | Photovoltaic grid-connected inverter for active energy decoupling |
| CN201869115U (en) * | 2010-11-25 | 2011-06-15 | 浙江昱能光伏科技集成有限公司 | Solar photovoltaic synchronization group micro inverter |
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| Title |
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| A modular photo-voltaic grid-connected inverter based on phase-shifted-carrier technique;Xuanyuan Wang et al;《Conference Record of the Industry Applications Conference, 2002. 37th IAS Annual Meeting》;20021018;第2520-2525页 * |
| JP特开2001-255949A 2001.09.21 |
| XuanyuanWangetal.Amodularphoto-voltaicgrid-connectedinverterbasedonphase-shifted-carriertechnique.《ConferenceRecordoftheIndustryApplicationsConference 2002. 37th IAS Annual Meeting》.2002 |
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Denomination of invention: Solar photovoltaic synchronization group micro-inverter and direct current and alternating current inverting methods Effective date of registration: 20200611 Granted publication date: 20130213 Pledgee: China Co. truction Bank Corp Jiaxing branch Pledgor: Zhejiang Yuneng Technology Co.,Ltd. Registration number: Y2020330000337 |
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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, South Lake District, Zhejiang Patentee before: Zhejiang Yuneng Technology Co.,Ltd. |
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