CN204068284U - A kind of photovoltaic energy storage mixing converter system - Google Patents
A kind of photovoltaic energy storage mixing converter system Download PDFInfo
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- CN204068284U CN204068284U CN201420416355.4U CN201420416355U CN204068284U CN 204068284 U CN204068284 U CN 204068284U CN 201420416355 U CN201420416355 U CN 201420416355U CN 204068284 U CN204068284 U CN 204068284U
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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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
A kind of photovoltaic energy storage mixing converter system, comprise and be connected in parallel by multiple DC/AC subelement the DC/AC unit formed, the output of described DC/AC unit is connected with electrical network, the input of described DC/AC unit has two input branch roads, one of them input branch road is connected with the output of photovoltaic module, another input branch road is connected with the output of energy-accumulating medium, and described DC/AC subelement is two way convertor; Electric current in each DC/AC subelement of the utility model reduces, and corresponding caloric value can effectively reduce, and effectively can improve the reliability and stability of current transformer.
Description
Technical field
The utility model relates to converter topology field, is specifically related to a kind of photovoltaic energy storage mixing converter system.
Background technology
In current photovoltaic generating system, current transformer is the converter system integrating generating and energy storage, and various direct current energy not only can be converted to alternating current that can be grid-connected by this system, alternating current unnecessary for electrical network end can be converted to direct current simultaneously and store.Based on the advantage of this system, current transformer will become the main flow of grid-connected system.
The system of current transformer in prior art, for powerful current transformer, because the electric current flow through in circuit is larger, the power that DC/AC module is born and electric current larger, make power model caloric value in whole DC/AC large, because electric current is too large, the charge/discharge rates of DC/DC also can be very low simultaneously, finally cause the reliability and stability of current transformer relatively poor, the conversion efficiency of whole current transformer is low.
Summary of the invention
In order to solve above-mentioned prior art Problems existing, the utility model provides a kind of photovoltaic energy storage mixing converter system, and the electric current in each DC/AC subelement reduces, and corresponding caloric value can effectively reduce, and effectively can improve the reliability and stability of current transformer.
For reaching above object, the utility model adopts following technical scheme:
A kind of photovoltaic energy storage mixing converter system, comprise and be connected in parallel by multiple DC/AC subelement the DC/AC unit formed, the output of described DC/AC unit is connected with electrical network, the input of described DC/AC unit has two input branch roads, one of them input branch road is connected with the output of photovoltaic module, another input branch road is connected with the output of energy-accumulating medium, and described DC/AC subelement is two way convertor.
Be in series with DC/DC unit between the output of described energy-accumulating medium and another input branch road of DC/AC unit, described DC/DC unit is composed in parallel by multiple DC/DC subelement, and each DC/DC subelement is two way convertor.
Described DC/DC subelement is connected with similar and different energy-accumulating medium separately.
Be in series with DC/DC unit between the output of described photovoltaic module and an input branch road of DC/AC unit, described DC/DC unit is composed in parallel by multiple DC/DC subelement, and each DC/DC subelement is unidirectional current transformer.
Compared to the prior art comparatively, the utility model possesses following advantage:
1, DC/AC unit adopts multiple subelement to compose in parallel, and the power that each subelement is shared is little, and the electric current in each subelement is also little, and corresponding caloric value can effectively reduce, and effectively can improve the reliability and stability of current transformer.
2, between another input branch road of the output of energy-accumulating medium and DC/AC unit and be in series with DC/DC unit between the output of DC/AC unit and the input of energy-accumulating medium, DC/DC unit can shorten the charge and discharge time of energy-accumulating medium, improve the efficiency of discharge and recharge.And the subelement in DC/DC unit can be connected with energy-accumulating medium by common bus, also can be connected with energy-accumulating medium separately by each DC/DC subelement simultaneously, thus DC/DC subelement not common bus time, the input of DC/DC can be multiple energy-accumulating medium.
3, between the output of photovoltaic module and an input branch road of DC/AC unit, DC/DC unit is in series with, when the input voltage that the voltage that photovoltaic module exports does not meet DC/AC unit requires, the voltage that photovoltaic module can export by DC/DC unit raises or reduces, and makes it meet the requirement of DC/AC unit input voltage.
Accompanying drawing explanation
Fig. 1 is the utility model embodiment one photovoltaic energy storage mixing converter system structure chart.
Fig. 2 is the utility model embodiment two photovoltaic energy storage mixing converter system structure chart.
Embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
Embodiment one
As shown in Figure 1, a kind of photovoltaic energy storage mixing of the present embodiment converter system, comprise and be connected in parallel by multiple DC/AC subelement the DC/AC unit formed, the output of described DC/AC unit is connected with electrical network, the input of described DC/AC unit has two input branch roads, one of them input branch road is connected with the output of photovoltaic module, and another input branch road is connected with the output of energy-accumulating medium, and described DC/AC subelement is two way convertor; Be in series with DC/DC unit between the output of described energy-accumulating medium and another input branch road of DC/AC unit, described DC/DC unit is composed in parallel by multiple DC/DC subelement, and each DC/DC subelement is two way convertor.
As preferred implementation of the present utility model, described DC/DC subelement is connected with similar and different energy-accumulating medium separately.
As shown in Figure 1, the operation principle of the present embodiment is: the direct current that photovoltaic module exports directly is given DC/AC unit and carried out inversion, and be then connected to the grid, in described DC/AC unit, each subelement in parallel works simultaneously; The direct voltage that various energy-accumulating medium exports through the translation circuit of DC/DC unit by energy-accumulating medium in addition carries out raising or reduce the requirement making it meet DC/AC unit input voltage, then as another road direct current input of DC/AC unit after confluxing, after DC/AC subelement in parallel each in DC/AC unit carries out inversion, then conflux and be connected to the grid.Because each DC/AC subelement in parallel is two way convertor, each DC/AC subelement in parallel also can convert the alternating current of grid side to direct current and give DC/DC unit, charges to energy-accumulating medium, and now, the input of DC/AC unit is as output.
Embodiment two
As shown in Figure 2, a kind of photovoltaic energy storage mixing of the present embodiment converter system, comprise and be connected in parallel by multiple DC/AC subelement the DC/AC unit formed, the output of described DC/AC unit is connected with electrical network, the input of described DC/AC unit has two input branch roads, one of them input branch road is connected with the output of photovoltaic module, and another input branch road is connected with the output of energy-accumulating medium, and described DC/AC subelement is two way convertor; Be in series with DC/DC unit between the output of described photovoltaic module and an input branch road of DC/AC unit, described DC/DC unit is composed in parallel by multiple DC/DC subelement, and each DC/DC subelement is unidirectional current transformer.
As shown in Figure 2, the operation principle of the present embodiment is: the direct current that photovoltaic module exports is given each DC/AC unit in parallel and carried out inversion after DC/DC module in parallel carries out voltage transitions, then be connected to the grid, the direct current that DC/DC exports simultaneously also can charge to energy-accumulating medium; The direct current that energy-accumulating medium exports in addition is connected to the grid after also directly can supply each DC/AC inversion in parallel, because each DC/AC subelement in parallel is two way convertor, each DC/AC unit in parallel charges to energy-accumulating medium after also can converting the alternating current of grid side to direct current, now, the input of DC/AC unit is as output.
Claims (4)
1. a photovoltaic energy storage mixing converter system, it is characterized in that: comprise and be connected in parallel by multiple DC/AC subelement the DC/AC unit formed, the output of described DC/AC unit is connected with electrical network, the input of described DC/AC unit has two input branch roads, one of them input branch road is connected with the output of photovoltaic module, another input branch road is connected with the output of energy-accumulating medium, and described DC/AC subelement is two way convertor.
2. a kind of photovoltaic energy storage mixing converter system according to claim 1, it is characterized in that: between the output of described energy-accumulating medium and another input branch road of DC/AC unit, be in series with DC/DC unit, described DC/DC unit is composed in parallel by multiple DC/DC subelement, and each DC/DC subelement is two way convertor.
3. a kind of photovoltaic energy storage mixing converter system according to claim 2, is characterized in that: described DC/DC subelement is connected with similar and different energy-accumulating medium separately.
4. a kind of photovoltaic energy storage mixing converter system according to claim 1, it is characterized in that: between the output of described photovoltaic module and an input branch road of DC/AC unit, be in series with DC/DC unit, described DC/DC unit is composed in parallel by multiple DC/DC subelement, and each DC/DC subelement is unidirectional current transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420416355.4U CN204068284U (en) | 2014-07-25 | 2014-07-25 | A kind of photovoltaic energy storage mixing converter system |
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| CN201420416355.4U CN204068284U (en) | 2014-07-25 | 2014-07-25 | A kind of photovoltaic energy storage mixing converter system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108258810A (en) * | 2016-12-28 | 2018-07-06 | 比亚迪股份有限公司 | Direct current photovoltaic energy-storage system and its control method |
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- 2014-07-25 CN CN201420416355.4U patent/CN204068284U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108258810A (en) * | 2016-12-28 | 2018-07-06 | 比亚迪股份有限公司 | Direct current photovoltaic energy-storage system and its control method |
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