CN203278266U - Solar photovoltaic grid-connected system - Google Patents
Solar photovoltaic grid-connected system Download PDFInfo
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- CN203278266U CN203278266U CN2013203368270U CN201320336827U CN203278266U CN 203278266 U CN203278266 U CN 203278266U CN 2013203368270 U CN2013203368270 U CN 2013203368270U CN 201320336827 U CN201320336827 U CN 201320336827U CN 203278266 U CN203278266 U CN 203278266U
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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 discloses a solar photovoltaic grid-connected system. The solar photovoltaic grid-connected system comprises a solar cell which is connected with a power grid through a grid-connected inverter; a driving circuit of the grid-connected inverter is connected with a digital signal processor (DSP); the direct current side and the alternating current side of the grid-connected inverter are provided with a direct current side voltage/current sampling module and an alternating current side voltage/current sampling module respectively; the output ends of the direct current side voltage/current sampling module and the alternating current side voltage/current sampling module are respectively connected with output ends of the digital signal processor (DSP); and the digital signal processor (DSP) adopts the maximum power point tracking maximum (MPPT) to control the output voltage and current of the solar cell through the grid-connected inverter, and adopts the digital phase-locked loop algorithm to control the output current of the grid-connected inverter to make the output current have the same frequency and phase with the voltage of the power grid. The solar photovoltaic grid-connected system of the utility model is advantageous in simple structure, decreased number of used hardware, reduced failure rate, and cost-saving property.
Description
Technical field
The utility model relates to the electric power new energy field, is specifically related to the solar photovoltaic grid-connection system.
Background technology
Solar photovoltaic interconnected inverter is to convert the direct current that photovoltaic array sends the device of alternating current to by power electronic device, is the important component part of solar energy grid-connected photovoltaic system.In current solar energy power generating field, the Focal point and difficult point of research is exactly the control problem of solar photovoltaic inverter.
As the important component part of solar photovoltaic generation system, solar photovoltaic inverter will solve the control problem of two aspects: first is solar cell Maximum Power Output problem, i.e. MPPT maximum power point tracking (MPPT) problem.The volt-ampere characteristic curve of solar cell output as shown in Figure 1, the curved Changing Pattern of the power output of solar cell, in order to allow the power output of solar cell be in maximum power point, this just requires us to remove to control output voltage and the output current of solar cell by inverter, to realize MPPT maximum power point tracking; Second is the problem that is incorporated into the power networks of solar power generation, it is the phase-locked problem of inverter output current and line voltage, solar grid-connected electricity generation system will realize final generating electricity by way of merging two or more grid systems, must realize that inverter output current and line voltage are synchronous, must realize the same frequency homophase of solar cell output current and line voltage.
Prior art is with the drive circuit of DSP DSP CONTROL combining inverter, and solve above-mentioned two problems by MPPT controller and phase-locked loop circuit respectively, and be the multistage grid-connected system, hardware used is more, complex structure, failure rate is higher and cost is higher.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of solar photovoltaic grid-connection system, can solve prior art adopts the multistage grid-connected system to realize the MPPT maximum power point tracking of solar cell output, and the same frequency homophase of realizing solar cell output current and line voltage, cause solar photovoltaic grid-connection system configuration complexity, failure rate and the higher problem of cost.
The utility model is achieved through the following technical solutions:
the solar photovoltaic grid-connection system, comprise the solar cell that connects electrical network by combining inverter, the drive circuit of described combining inverter is connected in the DSP digital signal processor, the DC side of described combining inverter and AC are respectively equipped with dc voltage current sample module and AC electric current and voltage sampling module, the output of described dc voltage current sample module and AC electric current and voltage sampling module is connected to respectively the output of DSP digital signal processor, described DSP digital signal processor adopts MPPT MPPT maximum power point tracking algorithm to control the output voltage of solar cell by combining inverter, electric current, and adopt the digital phase-locked loop algorithm to control output current and the same homophase frequently of line voltage of combining inverter.
The further improvement of the utility model scheme is, described solar cell output connects combining inverter by DC side EMC filter, and described dc voltage current sample module is connected between solar cell output and DC side EMC filter input end.
The further improvement of the utility model scheme is, described dc voltage current sample module comprises the voltage sample module that is parallel between solar cell the two poles of the earth, and the direct current Hall element that is series at the solar cell negative pole.
The further improvement of the utility model scheme is, the output of described combining inverter is connected electrical network by transformer with AC EMC filter successively, and described AC electric current and voltage sampling module comprises the output and the inverter current Hall element between transformer that are series at combining inverter, be parallel to inverter voltage instrument transformer between transformer input the two poles of the earth, be parallel to the line voltage instrument transformer between AC EMC filter input the two poles of the earth.
The further improvement of the utility model scheme is, the two poles of the earth of described solar cell are connected with respectively piezo-resistance ZR1, piezo-resistance ZR2, and the other end parallel connection of described piezo-resistance ZR1 and piezo-resistance ZR2 is by resistance R 1 ground connection.
The further improvement of the utility model scheme is, the two poles of the earth of described electrical network are connected with respectively piezo-resistance ZR3, piezo-resistance ZR4, and the other end parallel connection of described piezo-resistance ZR3 and piezo-resistance ZR4 is by resistance R 2 ground connection.
The utility model advantage compared with prior art is:
By being programmed, the DSP digital signal processor realizes the MPPT maximum power point tracking of solar cell power output, and the same frequency homophase of solar cell output current and line voltage, it is a kind of single stage type solar photovoltaic grid-connection system configuration, system configuration is simple, hardware quantity used reduces, reduce the failure rate of system, saved simultaneously cost.
Description of drawings
Fig. 1 is the volt-ampere characteristic curve of photovoltaic array output.
Fig. 2 is structured flowchart of the present utility model.
Fig. 3 is electrical schematic diagram of the present utility model.
Embodiment
the solar photovoltaic grid-connection system, comprise that the combining inverter that forms by four insulation gate pole bipolar transistor IGBTs connects the solar cell of electrical network, described solar cell output connects combining inverter by DC side EMC filter, the output of described combining inverter is connected electrical network by transformer with AC EMC filter successively, the drive circuit of described combining inverter is connected in the DSP digital signal processor, the DC side of described combining inverter and AC are respectively equipped with dc voltage current sample module and AC electric current and voltage sampling module, the output of described dc voltage current sample module and AC electric current and voltage sampling module is connected to respectively the output of DSP digital signal processor, described dc voltage current sample module comprises the voltage sample module that is parallel between solar cell the two poles of the earth, and the direct current Hall element that is series at the solar cell negative pole, described AC electric current and voltage sampling module comprises the output and the inverter current Hall element between transformer that are series at combining inverter, be parallel to inverter voltage instrument transformer between transformer input the two poles of the earth, be parallel to the line voltage instrument transformer between AC EMC filter input the two poles of the earth, described DSP digital signal processor adopts MPPT MPPT maximum power point tracking algorithm to control output voltage, the electric current of solar cell by combining inverter, and adopts the digital phase-locked loop algorithm to control output current and the same homophase frequently of line voltage of combining inverter, by the output valve to dc voltage current sample module and AC electric current and voltage sampling module, upper and lower limit is set and reports to the police, can realize alarm and protection and fault detect to DC side and AC.
The two poles of the earth of described solar cell are connected with respectively piezo-resistance ZR1, piezo-resistance ZR2 as overvoltage protection, and the other end parallel connection of described piezo-resistance ZR1 and piezo-resistance ZR2 is by resistance R 1 ground connection; The two poles of the earth of described electrical network are connected with respectively piezo-resistance ZR3, piezo-resistance ZR4 as overvoltage protection, and the other end parallel connection of described piezo-resistance ZR3 and piezo-resistance ZR4 is by resistance R 2 ground connection.
Claims (6)
1. solar photovoltaic grid-connection system, comprise the solar cell that connects electrical network by combining inverter, the drive circuit of described combining inverter is connected in the DSP digital signal processor, it is characterized in that: the DC side of described combining inverter and AC are respectively equipped with dc voltage current sample module and AC electric current and voltage sampling module, the output of described dc voltage current sample module and AC electric current and voltage sampling module is connected to respectively the output of DSP digital signal processor, described DSP digital signal processor adopts MPPT MPPT maximum power point tracking algorithm to control the output voltage of solar cell by combining inverter, electric current, and adopt the digital phase-locked loop algorithm to control output current and the same homophase frequently of line voltage of combining inverter.
2. solar photovoltaic grid-connection as claimed in claim 1 system, it is characterized in that: described solar cell output connects combining inverter by DC side EMC filter, and described dc voltage current sample module is connected between solar cell output and DC side EMC filter input end.
3. solar photovoltaic grid-connection as claimed in claim 1 or 2 system, it is characterized in that: described dc voltage current sample module comprises the voltage sample module that is parallel between solar cell the two poles of the earth, and the direct current Hall element that is series at the solar cell negative pole.
4. solar photovoltaic grid-connection as claimed in claim 1 system, it is characterized in that: the output of described combining inverter is connected electrical network by transformer with AC EMC filter successively, and described AC electric current and voltage sampling module comprises the output and the inverter current Hall element between transformer that are series at combining inverter, be parallel to inverter voltage instrument transformer between transformer input the two poles of the earth, be parallel to the line voltage instrument transformer between AC EMC filter input the two poles of the earth.
5. solar photovoltaic grid-connection as claimed in claim 1 system, it is characterized in that: the two poles of the earth of described solar cell are connected with respectively piezo-resistance ZR1, piezo-resistance ZR2, and the other end parallel connection of described piezo-resistance ZR1 and piezo-resistance ZR2 is by resistance R 1 ground connection.
6. solar photovoltaic grid-connection as claimed in claim 1 system, it is characterized in that: the two poles of the earth of described electrical network are connected with respectively piezo-resistance ZR3, piezo-resistance ZR4, and the other end parallel connection of described piezo-resistance ZR3 and piezo-resistance ZR4 is by resistance R 2 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203368270U CN203278266U (en) | 2013-06-13 | 2013-06-13 | Solar photovoltaic grid-connected system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203368270U CN203278266U (en) | 2013-06-13 | 2013-06-13 | Solar photovoltaic grid-connected system |
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| CN203278266U true CN203278266U (en) | 2013-11-06 |
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| CN2013203368270U Expired - Fee Related CN203278266U (en) | 2013-06-13 | 2013-06-13 | Solar photovoltaic grid-connected system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560545A (en) * | 2013-11-18 | 2014-02-05 | 国家电网公司 | Grid-connected inverter based on digital phase-locked loop technology and working method thereof |
-
2013
- 2013-06-13 CN CN2013203368270U patent/CN203278266U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560545A (en) * | 2013-11-18 | 2014-02-05 | 国家电网公司 | Grid-connected inverter based on digital phase-locked loop technology and working method thereof |
| CN103560545B (en) * | 2013-11-18 | 2016-02-10 | 国家电网公司 | A kind of combining inverter based on Digital Phase-Locked Loop Technology and method of work thereof |
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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 |
Granted publication date: 20131106 Termination date: 20140613 |
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| EXPY | Termination of patent right or utility model |