CN102457068A - Solar photovoltaic grid-connected system based on packet MPPT control - Google Patents
Solar photovoltaic grid-connected system based on packet MPPT control Download PDFInfo
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- CN102457068A CN102457068A CN2010105151599A CN201010515159A CN102457068A CN 102457068 A CN102457068 A CN 102457068A CN 2010105151599 A CN2010105151599 A CN 2010105151599A CN 201010515159 A CN201010515159 A CN 201010515159A CN 102457068 A CN102457068 A CN 102457068A
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- mppt control
- solar photovoltaic
- photovoltaic grid
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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 invention relates to a solar photovoltaic grid-connected system, so that two kinds of grid connected mode of an alternating current and a direct current can be realized. The system is characterized in that: the solar photovoltaic grid-connected system comprises a generating apparatus, a DC/DC current transformer platform, a direct current centralized platform, a DC/AC inversion platform, and a DC/DC centralized current transformer apparatus. Generating equipment-a PV module is connected with a DC/DC converter so as to form an independent generating unit, so that generated power can be respectively and separately output; outputs of multipath DC/DC current transformers are in parallel connection and are accessed to the direct current centralized platform; and then grid connection is completed by a DC/AC grid connection converter.
Description
Technical field:
The invention belongs to field of solar thermal power generation, be specifically related to a kind of novel solar grid-connected mode, especially a kind of solar photovoltaic grid-connection system based on grouping MPPT control.
Background technology:
Serious day by day along with world energy sources shortage and problem of environmental pollution, the energy and environment become the human great basic problem that is faced of 21st century, clean, the development and the application of regenerative resource more and more receive the extensive concern of countries in the world.Solar energy as the source of life on earth is human most important regenerative resource.The sun shines tellurian energy and just be equivalent to 5,000,000 tons of coals each second, and the nuclear fusion reaction of solar interior can keep tens to hundreds of 100000000 years, and for the mankind's limited life span, solar energy can be described as inexhaustible.
For above-mentioned reasons; The new distributed photovoltaic parallel in system is able to extensive use; This system mainly is made up of solar panels and grid-connected converter, and wherein solar panels are direct current energy with conversion of solar energy, and current transformer is converted into direct current with electrical network and is incorporated into the power networks with the alternating current of pressing together frequently.Performance decision by solar energy; Environmental change has very big influence to its output voltage and power, for reliably being incorporated into the power networks of assurance system output and making full use of of solar panels energy, multiple grid-connected mode occurred; Comprise centralized, interchange modular, but these modes all there is the shortcoming of self.
Centralized photovoltaic parallel in system is with after a plurality of solar panels modules (PV module) parallel connection, inserts unified three-phase DC/AC inverter.For avoiding PV module output voltage wide variation to influence the work of DC/AC; Adopt a large amount of PV cascaded structures; Adopt the diode parallel connection to enlarge power system capacity, owing to adopt centralized maximal power tracing control, and the operating state of each PV module is different; The maximum power of each PVmodule is not used, and has caused system's total-power loss.Owing to concentrate the current transformer capacity bigger, adopt the thyristor device more, cause system to produce bigger current harmonics, reduce operating efficiency.And in a single day integrated system builds completion, is difficult for the expansion capacity.
Exchanging module is that photovoltaic parallel in system is that single solar panels and current transformer are integrated into an electric equipment, and this electric equipment connects a DC/AC current transformer respectively simultaneously.This structure has eliminated because the loss that does not match and cause between the solar panels; Make each solar panels can both independently realize MPPT; And be convenient to system extension, but because the output voltage wide variation of single solar panels, make DC/AC cisco unity malfunction under low excessively output voltage; System effectiveness reduces, and complicated structure improves the cost of every watt of electric weight.
Summary of the invention:
In order to solve the deficiency of existing distributed photovoltaic parallel in system, the present invention proposes a kind of new solar photovoltaic grid-connection mode, to overcome the defective of prior art.
In order to realize above-mentioned technical purpose, solar photovoltaic grid-connection of the present invention system can realize two kinds of alternating current and direct currents and net mode, and its technology is achieved in that
The solar photovoltaic grid-connection system comprises TRT, DC/DC unsteady flow platform, and direct current is concentrated platform, DC/AC inversion platform, DC/DC concentrates convertor assembly;
Earlier with generating equipment---solar panels module (PV module) is connected with a DC/DC converter; Constitute an independently generator unit; Make generate electricity and can distinguish independent output; Then the output-parallel of multichannel DC/DC current transformer is linked into direct current and concentrates platform, accomplish and be incorporated into the power networks through the DC/AC converter that is incorporated into the power networks then.
Solar photovoltaic grid-connection of the present invention system; Each solar panels module and DC/DC are connected to form independently generator unit; The DC/DC DC converting assembly that this generator unit carries is separately accomplished the direct current energy MPPT maximum power point tracking that photovoltaic array is sent; Promptly independently realize MPPT maximum power point tracking, make full use of the energy of electricity generation system input; Through DC/AC stable DC side voltage,, can guarantee that also the operation of system is normal even environmental change makes the output voltage fluctuation of solar panels; And be convenient to the DC/AC switch element of selecting allowance moderate, the capacity of DC/AC is fully utilized.
Through regulating the quantity of parallelly connected DC/DC modular unit, the capacity of system can be expanded arbitrarily within the specific limits in addition.When the DC/AC inverter is changed, when electric pressure improves, can pass through the method for series connection DC/DC modular unit, the expansion capacity.
Solar photovoltaic grid-connection of the present invention system, generator unit includes but not limited to the solar panels module, can various multi-form and type, even TRT that can be in different ways, like wind power generation plant etc.
Description of drawings:
Fig. 1 is based on and exchanges the sketch map of concentrating topological structure to insert the electrical network mode.
Fig. 2 is based on direct current and concentrates topological structure to insert the sketch map of electrical network mode.
Fig. 3 is the composition structural representation of grid-connected system according to the invention.
1. TRTs among the figure, 11. electrification components, 2.DC/DC unsteady flow platform, 21.DC/DC current transformer; 22.AC/DC current transformer, 3.DC/AC inverter, 4.DC/DC convertor assembly, 100. solar power generation modules; 200.MPPT control module, 300.DC/DC convertor assembly, 400. wind power generation modules; 500.AC/DC convertor assembly, 600.DC/DC convertor assembly, 700. DC/AC inverters.
Embodiment:
As shown in Figure 1; Somely send out electrification component 11 galvanic and be connected with a DC/DC current transformer 21 of DC/DC unsteady flow platform 2 respectively what form TRT 1; Electrification component 11 and an AC/DC unsteady flow platform 22 and the DC/DC current transformer 21 that maybe will form some alternating currents of TRT 1 are connected in series; Form generator unit respectively; Accomplish the generate electricity MPPT maximum power point tracking of ability of electrification component 11 through DC/DC current transformer 21; And direct voltage step-up/down to the direct current of output concentrated the electric pressure of platform, be connected with DC/AC inverter 3 after the direct current parallel connection of secondly all DC/DC unsteady flow platforms 21 being exported, in electric current input AC electrical network.
As shown in Figure 2; Somely send out electrification component 11 galvanic and be connected with a DC/DC current transformer 21 of DC/DC unsteady flow platform 2 respectively what form TRT 1; Electrification component 11 and an AC/DC unsteady flow platform 22 and the DC/DC current transformer 21 that maybe will form some alternating currents of TRT 1 are connected in series; Form generator unit respectively; Accomplish the generate electricity MPPT maximum power point tracking of ability of electrification component 11 through DC/DC current transformer 21; And direct voltage step-up/down to the direct current of output concentrated the electric pressure of platform, be connected with the DC/DC convertor assembly after the direct current parallel connection of secondly all DC/DC unsteady flow platforms 21 being exported, in electric current output DC net.
As shown in Figure 3, grid-connected system according to the invention comprises solar power generation module 100, MPPT control module 200, DC/DC convertor assembly 300, wind power generation module 400, AC/DC convertor assembly 500, DC/DC convertor assembly 600, DC/AC inverter 700.Wherein MPPT control module 200 is connected with each solar power generation module 100, and each electricity generation module is carried out maximum power point tracking, to guarantee the high efficiency of electricity generation module.
More than be to explanation of the present invention and non-limiting, based on other execution modes of inventive concept, all within protection scope of the present invention.
Claims (5)
1. solar photovoltaic grid-connection system based on grouping MPPT control, it is achieved in that and it is characterized in that; Comprise electricity generation module; The MPPT control module, DC/DC current transformer and inverter, wherein the MPPT control module is carried out maximum power point tracking to each electricity generation module; The DC/DC current transformer boosts the electric energy that the solar power generation module produces, and inverter converts electric energy to the required power supply form of standard electrical network.
2. a kind of solar photovoltaic grid-connection system based on grouping MPPT control according to claim 1 is characterized in that said electricity generation module is the solar power generation module.
3. a kind of solar photovoltaic grid-connection system based on grouping MPPT control according to claim 1 is characterized in that said electricity generation module is solar power generation module and other form electricity generation modules.
4. a kind of solar photovoltaic grid-connection system based on grouping MPPT control according to claim 3 is characterized in that said other form electricity generation modules are wind power generation module.
5. a kind of solar photovoltaic grid-connection system based on grouping MPPT control according to claim 1 is characterized in that said inverter is a DC/AC inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010105151599A CN102457068A (en) | 2010-10-21 | 2010-10-21 | Solar photovoltaic grid-connected system based on packet MPPT control |
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| CN2010105151599A CN102457068A (en) | 2010-10-21 | 2010-10-21 | Solar photovoltaic grid-connected system based on packet MPPT control |
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| CN102457068A true CN102457068A (en) | 2012-05-16 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105517653A (en) * | 2014-07-15 | 2016-04-20 | 阳光电源股份有限公司 | Centralized MPPT exiting and switching method and application thereof |
| CN105576693A (en) * | 2014-11-05 | 2016-05-11 | 武陟县电业总公司 | Wind and light integrated power generation street lamp-based power supply power grid-connected power generation method |
| CN106230288A (en) * | 2016-08-08 | 2016-12-14 | 湖州新智源电子科技有限公司 | A kind of multichannel MPPT Miniature inverter and control method thereof |
| WO2018149375A1 (en) * | 2017-02-16 | 2018-08-23 | Huawei Technologies Co., Ltd. | Distributed/central optimizer architecture |
| US10651735B2 (en) | 2017-02-06 | 2020-05-12 | Futurewei Technologies, Inc. | Series stacked DC-DC converter with serially connected DC power sources and capacitors |
-
2010
- 2010-10-21 CN CN2010105151599A patent/CN102457068A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105517653A (en) * | 2014-07-15 | 2016-04-20 | 阳光电源股份有限公司 | Centralized MPPT exiting and switching method and application thereof |
| CN105517653B (en) * | 2014-07-15 | 2018-06-12 | 阳光电源股份有限公司 | A kind of MPPT hubbed modes exit, switching method and its related application |
| US10693297B2 (en) | 2014-07-15 | 2020-06-23 | Sungrow Power Supply Co., Ltd. | Centralized MPPT exiting and switching method and application thereof |
| CN105576693A (en) * | 2014-11-05 | 2016-05-11 | 武陟县电业总公司 | Wind and light integrated power generation street lamp-based power supply power grid-connected power generation method |
| CN105576693B (en) * | 2014-11-05 | 2018-09-28 | 国家电网公司 | A method of the power supply grid based on wind and solar integrated power generation road lamp generates electricity by way of merging two or more grid systems |
| CN106230288A (en) * | 2016-08-08 | 2016-12-14 | 湖州新智源电子科技有限公司 | A kind of multichannel MPPT Miniature inverter and control method thereof |
| US10651735B2 (en) | 2017-02-06 | 2020-05-12 | Futurewei Technologies, Inc. | Series stacked DC-DC converter with serially connected DC power sources and capacitors |
| WO2018149375A1 (en) * | 2017-02-16 | 2018-08-23 | Huawei Technologies Co., Ltd. | Distributed/central optimizer architecture |
| CN110301081A (en) * | 2017-02-16 | 2019-10-01 | 华为技术有限公司 | Distributed/centralized optimizer framework |
| US10665743B2 (en) | 2017-02-16 | 2020-05-26 | Futurewei Technologies, Inc. | Distributed/central optimizer architecture |
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Application publication date: 20120516 |