CN205945091U - Photovoltaic power -generation grid -connection system - Google Patents
Photovoltaic power -generation grid -connection system Download PDFInfo
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- CN205945091U CN205945091U CN201620662483.6U CN201620662483U CN205945091U CN 205945091 U CN205945091 U CN 205945091U CN 201620662483 U CN201620662483 U CN 201620662483U CN 205945091 U CN205945091 U CN 205945091U
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- 238000010248 power generation Methods 0.000 title claims abstract description 22
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 abstract 2
- 230000005611 electricity Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000001172 regenerating effect Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000036772 blood pressure Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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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 photovoltaic power -generation grid -connection system, include: grid -connected device and photovoltaic array, wherein, this grid -connected device is connected through the series system with this photovoltaic array to grid -connected device and photovoltaic array are connected to between the both ends of dc bus, grid -connected device's output voltage is adjustable, and the both ends of dc bus include one of followingly: the negative pole of anodal and the anodal of negative pole, dc bus of dc bus and ground, dc bus and to the capacity of net device is less, thereby has solved and carried out maximum power through the DCDC converter among the prior art and trail, and the capacity of DCDC converter is great, and the problem bulky, that the cost is higher has been guaranteed MPPT's superperformance to have improved photovoltaic cell board availability factor.
Description
Technical field
This utility model is related to field of power electronics and in particular to a kind of photovoltaic power generation grid-connecting system.
Background technology
It was predicted that solar energy power generating can occupy the important seat of world energy sources consumption in 21 century, not only to substitute
Part conventional energy resource, and the main body of world energy supplies will be become.Expect the year two thousand thirty, regenerative resource is in total energy source structure
In will account for more than 30%, and accounting in world's total electricity supply for the solar energy power generating is also up to more than 10%；Arrive
The year two thousand forty, regenerative resource will account for more than the 50% of total energy consumption, and solar energy power generating will account for more than the 20% of total electricity；To 21
In the end of the century, regenerative resource will account for more than 80% in energy resource structure, and solar electrical energy generation will account for more than 60%.These numerals
Enough to show the development prospect of solar photovoltaic industry and its in the important strategic position of energy field.
It can be seen that solar energy is played in following energy resource system in the case of traditional fossil energy worsening shortages
Effect increasingly receives publicity, but current photovoltaic cell conversion efficiency low be solar energy large-scale promotion application bottleneck.
Photovoltaic array output characteristics has nonlinear characteristic, and its output voltage, electric current are subject to Intensity of the sunlight, ambient temperature and bear
Load situation affects.Under certain Intensity of the sunlight and ambient temperature, photovoltaic array can be operated in different output voltages,
But only in a certain output voltage values, the output of photovoltaic array can be only achieved maximum, at this moment the work of photovoltaic array
Make point and just reached the peak of output voltage curve, referred to as maximum power point (Maximum PowerPoint, referred to as
For MPP).Therefore, in photovoltaic generating system, the whole efficiency of system to be improved, an important approach is exactly real-time adjustment
The operating point of photovoltaic array, is allowed to always work near maximum power point, and this process is just referred to as MPPT maximum power point tracking
(Maximum Power Point Tracking, referred to as MPPT).As Fig. 1 shows the output of photovoltaic array with photovoltaic
The change of the output voltage of array.
It is all at present that maximal power tracing is carried out by DC/DC changer in the prior art, but DC/DC changer
Capacity is larger, and volume is big and cost is higher.
Utility model content
This utility model provides a kind of photovoltaic power generation grid-connecting system, at least to solve to become by DC/DC in prior art
Parallel operation carries out maximal power tracing, and the capacity of DC/DC changer is larger, and volume is big and the higher problem of cost.
According to one side of the present utility model, there is provided a kind of photovoltaic power generation grid-connecting system, including：Grid-connecting apparatus and light
Photovoltaic array；Wherein, described grid-connecting apparatus and described photovoltaic array are attached by series system, and described grid-connecting apparatus with
Described photovoltaic array is connected between the two ends of dc bus；The output voltage of described grid-connecting apparatus is adjustable；Described dc bus
Two ends include one below：The positive pole of described dc bus and negative pole, the positive pole of described dc bus and ground, described direct current are female
The negative pole of line and ground.
Alternatively, described grid-connecting apparatus include inverter.
Alternatively, described grid-connecting apparatus include：DC/AC inverter, transformator and rectifier bridge；Wherein, the described DC/AC change of current
The first end of the DC side of device connects to described photovoltaic array, and the second end of the DC side of described DC/AC inverter connects to institute
State dc bus, the AC of described DC/AC inverter connects to the first end of described transformator, the second end of described transformator
Connect to the first end of described rectifier bridge, the second end of described rectifier bridge connects to the two ends of described dc bus.
Alternatively, described grid-connecting apparatus include：DC/AC inverter, transformator, AC/DC inverter and low-voltage direct interface；
Wherein, the first end of the DC side of described DC/AC inverter connects to described photovoltaic array, the direct current of described DC/AC inverter
Second end of side connects to described dc bus, and the AC of described DC/AC inverter connects to the first end of described transformator,
Second end of described transformator connects to the AC of described AC/DC inverter, and the first of the DC side of described AC/DC inverter
End connects to the positive pole of described low-voltage direct interface, and the second end of the DC side of described AC/DC inverter connects to described low pressure
The negative pole of DC interface.
Alternatively, described grid-connecting apparatus include：DC/AC inverter, transformator with exchange interface；Wherein, described DC/AC changes
The first end of the DC side of stream device connects to described photovoltaic array, the second end of the DC side of described DC/AC inverter connect to
Described dc bus, the AC of described DC/AC inverter connects to the first end of described transformator, and the second of described transformator
End connects to described exchange interface.
By this utility model, using a kind of photovoltaic power generation grid-connecting system, including：Grid-connecting apparatus and photovoltaic array；Wherein,
This grid-connecting apparatus is attached by series system with this photovoltaic array, and grid-connecting apparatus are connected to direct current mother with photovoltaic array
Between the two ends of line；The output voltage of grid-connecting apparatus is adjustable, and the two ends of dc bus include one below：The positive pole of dc bus
With negative pole, the positive pole of dc bus and ground, the negative pole of dc bus and ground.Because grid-connecting apparatus and photovoltaic array are connected in series it
Connect afterwards to the two ends of dc bus, the output voltage sum of the therefore output voltage of grid-connecting apparatus and photovoltaic array is straight
The voltage of stream bus, simultaneously as the voltage of dc bus immobilizes, such that it is able to real by adjusting the voltage of grid-connecting apparatus
Now adjust the purpose of the voltage of photovoltaic array, and then make the output of photovoltaic array reach maximum.In addition, grid-connecting apparatus
Capacity less, solve in prior art and maximal power tracing, the capacity of DC/DC changer carried out by DC/DC changer
Larger, volume is big and the higher problem of cost is it is ensured that the superperformance of MPPT, improves photovoltaic battery panel service efficiency.
Brief description
In order to be illustrated more clearly that this utility model specific embodiment or technical scheme of the prior art, below will be right
In specific embodiment or description of the prior art the accompanying drawing of required use be briefly described it should be apparent that, below describe
In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram with the output voltage change of photovoltaic array for the output of photovoltaic array；
Fig. 2 is a structural representation of the photovoltaic power generation grid-connecting system according to this utility model embodiment；
Fig. 3 is another structural representation of the photovoltaic power generation grid-connecting system according to this utility model embodiment；
Fig. 4 is another structural representation of the photovoltaic power generation grid-connecting system according to this utility model embodiment；
Fig. 5 is another structural representation of the photovoltaic power generation grid-connecting system according to this utility model embodiment.
Specific embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is clearly and completely described it is clear that described
Embodiment is a part of embodiment of this utility model, rather than whole embodiments.Based on the embodiment in this utility model, this
The every other embodiment that field those of ordinary skill is obtained under the premise of not making creative work, broadly falls into this practicality
Novel protected scope.
In description of the present utility model, " " center ", " on ", D score, "left", "right", " perpendicular it should be noted that term
Directly ", the orientation of instruction such as " level ", " interior ", " outward " or position relationship are based on orientation shown in the drawings or position relationship, are only
For the ease of description this utility model with simplify description, rather than instruction or the hint device of indication or element must have specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that to restriction of the present utility model.Additionally, term " the
One ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that indicating or hint relative importance.
In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " being connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or integratedly
Connect；Can be to be mechanically connected or electrically connect；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary,
Can also be the connection of two element internals, can be wireless connection or wired connection.Common skill for this area
For art personnel, concrete meaning in this utility model for the above-mentioned term can be understood with concrete condition.
As long as additionally, involved technical characteristic in this utility model different embodiments disclosed below is each other
The conflict of not constituting just can be combined with each other.
Provide a kind of photovoltaic power generation grid-connecting system in the present embodiment, Fig. 2 is the light according to this utility model embodiment
One structural representation of volt electricity generation grid-connecting system, as shown in Fig. 2 photovoltaic power generation grid-connecting system, including：Photovoltaic array 11 and simultaneously
Net device 12, photovoltaic array 11 and grid-connecting apparatus 12 are attached by series system, and grid-connecting apparatus 12 and photovoltaic array
Between 11 two ends being connected to dc bus, the two ends of dc bus include one below：The positive pole of dc bus and negative pole, straight
The positive pole of stream bus and ground, the negative pole of dc bus and ground, for example, one end of grid-connecting apparatus 12 are connected to photovoltaic array 11,
The other end of grid-connecting apparatus 12 connects to the positive pole of dc bus, and one end of photovoltaic array 11 connects to grid-connecting apparatus 12, photovoltaic
The other end of array 11 connects to the negative pole of dc bus；Or, one end of grid-connecting apparatus 12 is connected to photovoltaic array 11, and
The other end of net device 12 connects to the negative pole of dc bus, and one end of photovoltaic array 11 connects to grid-connecting apparatus 12, photovoltaic battle array
The other end of row 11 connects to the positive pole of dc bus.The output voltage of grid-connecting apparatus 12 is adjustable.This dc bus can be high
Pressure dc bus.
Because grid-connecting apparatus 12 and photovoltaic array 11 are connected in series and connect to the positive pole and negative pole of dc bus afterwards,
The output voltage sum of the therefore output voltage of grid-connecting apparatus 12 and photovoltaic array 11 is the voltage of dc bus, simultaneously as
The voltage of dc bus immobilizes, such that it is able to realize adjusting the electricity of photovoltaic array 11 by adjusting the voltage of grid-connecting apparatus 12
The purpose of pressure, and then make the output of photovoltaic array 11 reach maximum.In addition, the capacity of grid-connecting apparatus 12 is less, solution
In prior art of having determined, maximal power tracing is carried out by DC/DC changer, the capacity of DC/DC changer is larger, volume is greatly simultaneously
And the higher problem of cost, it is ensured that the superperformance of MPPT, improves photovoltaic battery panel service efficiency.
In order to be exchanged to voltage or the conversion of direct current and magnitude of voltage is adjusted, in an alternative embodiment
In, grid-connecting apparatus 12 include inverter and transformator.That is, unidirectional current can be converted to by alternating current by inverter or will hand over
Stream electricity is converted to unidirectional current, can be boosted or blood pressure lowering by transformator.What generally photovoltaic array 11 produced is unidirectional current,
Dc bus transmission is also unidirectional current, therefore in the case that grid-connecting apparatus 12 are output as alternating current, can pass through the change of current
Alternating current is converted to unidirectional current by device, can increase or reduce the output voltage of grid-connecting apparatus 12 by transformator, thus entering
The output voltage of one successive step photovoltaic array 11.In another alternative embodiment, grid-connecting apparatus 12 only can include inverter,
In this case, inverter outputs rational magnitude of voltage it is not necessary to being raised to voltage or reduced by transformator.
The Main Function of above-mentioned grid-connecting apparatus 12 is voltage is adjusted, and its implementation can include many kinds,
Below this is illustrated.
Fig. 3 is another structural representation of the photovoltaic power generation grid-connecting system according to this utility model embodiment, as Fig. 3 institute
Show, grid-connecting apparatus include：DC/AC inverter, transformator and rectifier bridge；Wherein, the first end of the DC side of DC/AC inverter connects
It is connected to photovoltaic array 11, the second end of the DC side of DC/AC inverter connects dc bus, and the AC of DC/AC inverter is even
It is connected to the first end of transformator, the second end of transformator connects to the first end of rectifier bridge, the second end of rectifier bridge connects to straight
The two ends of stream bus, for example, the second end of rectifier bridge connects positive pole and negative pole to dc bus, or the second end of rectifier bridge
Connect the positive pole to dc bus and ground, or the second end of rectifier bridge connects negative pole and ground to dc bus.DC/AC changes
DC voltage is converted into exchanging by stream device, then is connected with rectifier bridge after transformer coupled transformation, rectifier bridge and HVDC
It is connected, power is transported to HVDC.By the control of DC/AC inverter, realize the controlled of photovoltaic array side DC voltage,
Thus carrying out maximal power tracing.Equipment manufacturing cost can be reduced using diode rectifier bridge.
Fig. 4 is another structural representation of the photovoltaic power generation grid-connecting system according to this utility model embodiment, as Fig. 4 institute
Show, grid-connecting apparatus include：DC/AC inverter, transformator, AC/DC inverter and low-voltage direct interface；Wherein, DC/AC inverter
The first end of DC side connect to photovoltaic array 11, the second end of the DC side of DC/AC inverter connects to dc bus,
The AC of DC/AC inverter connects to the first end of transformator, and the second end of transformator connects to the exchange of AC/DC inverter
Side, the first end of the DC side of AC/DC inverter connects to the positive pole of low-voltage direct interface, the DC side of AC/DC inverter
Second end connects to the negative pole of low-voltage direct interface.DC/AC inverter by DC voltage conversion become exchange after with transformer primary side
Connect, isolation and the voltage transformation effect of high-low pressure realized by transformator.By the control of DC/AC inverter and AC/DC inverter,
Realize the controlled of photovoltaic array side DC voltage, thus carrying out maximal power tracing.
Fig. 5 is another structural representation of the photovoltaic power generation grid-connecting system according to this utility model embodiment, as Fig. 5 institute
Show, grid-connecting apparatus include：DC/AC inverter, transformator with exchange interface；Wherein, the first end of the DC side of DC/AC inverter
Connect to photovoltaic array 11, the second end of the DC side of DC/AC inverter connects to dc bus, the exchange of DC/AC inverter
Side connects to the first end of transformator, and the second end of transformator connects best friend's stream interface.DC/AC inverter is by DC voltage conversion
It is connected with transformer primary side after becoming exchange, isolation and the voltage transformation effect of high-low pressure realized by transformator, transformer secondary is direct
It is connected with low-voltage alternating-current.By the control of DC/AC inverter, realize the controlled of photovoltaic array side DC voltage, thus carrying out
High-power tracking.
In sum, a kind of photovoltaic power generation grid-connecting system being provided by this utility model, using the grid-connected dress of low capacity
Put and connect to adjust MPPT with photovoltaic array, solve in prior art and maximal power tracing is carried out by DC/DC changer,
The capacity of DC/DC changer is larger, and volume is big and the higher problem of cost is it is ensured that the superperformance of MPPT, improves light
Volt cell panel service efficiency.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.Right
For those of ordinary skill in the art, can also make on the basis of the above description other multi-forms change or
Change.There is no need to be exhaustive to all of embodiment.And the obvious change thus extended out or
Change among the protection domain created still in this utility model.
Claims (5)
1. a kind of photovoltaic power generation grid-connecting system is it is characterised in that include：
Grid-connecting apparatus and photovoltaic array；Wherein, described grid-connecting apparatus and described photovoltaic array are attached by series system, and
And described grid-connecting apparatus and described photovoltaic array are connected between the two ends of dc bus；The output voltage of described grid-connecting apparatus can
Adjust；
The two ends of described dc bus include one below：The positive pole of described dc bus and negative pole, described dc bus are just
Pole and ground, the negative pole of described dc bus and ground.
2. photovoltaic power generation grid-connecting system according to claim 1 is it is characterised in that described grid-connecting apparatus include inverter.
3. photovoltaic power generation grid-connecting system according to claim 1 is it is characterised in that described grid-connecting apparatus include：
DC/AC inverter, transformator and rectifier bridge；Wherein, the first end of the DC side of described DC/AC inverter connects to described
Photovoltaic array, the second end of the DC side of described DC/AC inverter connects to described dc bus, described DC/AC inverter
AC connects to the first end of described transformator, and the second end of described transformator connects to the first end of described rectifier bridge, institute
The second end stating rectifier bridge connects to the two ends of described dc bus.
4. photovoltaic power generation grid-connecting system according to claim 1 is it is characterised in that described grid-connecting apparatus include：
DC/AC inverter, transformator, AC/DC inverter and low-voltage direct interface；Wherein, the DC side of described DC/AC inverter
First end connect to described photovoltaic array, the second end of the DC side of described DC/AC inverter connects to described dc bus,
The AC of described DC/AC inverter connects to the first end of described transformator, and the second end of described transformator connects to described
The AC of AC/DC inverter, the first end of the DC side of described AC/DC inverter to described low-voltage direct interface just connects
Pole, the second end of the DC side of described AC/DC inverter connects to the negative pole of described low-voltage direct interface.
5. photovoltaic power generation grid-connecting system according to claim 1 is it is characterised in that described grid-connecting apparatus include：
DC/AC inverter, transformator with exchange interface；Wherein, the first end of the DC side of described DC/AC inverter connects to institute
State photovoltaic array, the second end of the DC side of described DC/AC inverter connects to described dc bus, described DC/AC inverter
AC connect to the first end of described transformator, the second end of described transformator connects to described exchange interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620662483.6U CN205945091U (en) | 2016-06-28 | 2016-06-28 | Photovoltaic power -generation grid -connection system |
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| CN201620662483.6U CN205945091U (en) | 2016-06-28 | 2016-06-28 | Photovoltaic power -generation grid -connection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106058926A (en) * | 2016-06-28 | 2016-10-26 | 全球能源互联网研究院 | Photovoltaic power generation grid-connected system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106058926A (en) * | 2016-06-28 | 2016-10-26 | 全球能源互联网研究院 | Photovoltaic power generation grid-connected system |
| CN106058926B (en) * | 2016-06-28 | 2019-01-08 | 全球能源互联网研究院有限公司 | A kind of photovoltaic power generation grid-connecting system |
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Address after: 102209 Beijing City, the future of science and Technology City Binhe Road, No. 18, No. Co-patentee after: State Grid Corporation of China Patentee after: Global energy Internet Institute, Inc. Address before: 102211 Beijing city Changping District Xiaotangshan town big East Village Road No. 270 Co-patentee before: State Grid Corporation of China Patentee before: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE |