CN208257429U - A kind of photovoltaic system with releasing series coupled device - Google Patents
A kind of photovoltaic system with releasing series coupled device Download PDFInfo
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- CN208257429U CN208257429U CN201820776832.6U CN201820776832U CN208257429U CN 208257429 U CN208257429 U CN 208257429U CN 201820776832 U CN201820776832 U CN 201820776832U CN 208257429 U CN208257429 U CN 208257429U
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- series coupled
- coupled device
- photovoltaic
- releasing
- parallel
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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
Abstract
The utility model provides a kind of with the photovoltaic system for releasing series coupled device, the photovoltaic group string being connected in parallel including several, several described photovoltaic group strings are connected in series by the equal photovoltaic module of quantity, photovoltaic group string accesses power grid after connecting with inverter parallel, it further include that several release series coupled device, one non-isolation DC/DC converter built in the releasing series coupled device and be equipped with No. 1 end line, No. 2 end lines and No. 3 three terminal wires of end line, the releasing series coupled device works in pairs, two releasings No. 1 of series coupled device and No. 2 end lines are connected in parallel on the output end of mismatch photovoltaic module, simultaneously, No. 2 and No. 3 end lines are connected in parallel on the output end of the normal photovoltaic module of two adjacent with mismatch photovoltaic module respectively.Using the utility model, the series coupled between mismatch photovoltaic module and adjacent component, lifting system generated energy can be released.
Description
Technical field
The utility model belongs to field of photovoltaic power generation, more particularly, to a kind of with the photovoltaic system for releasing series coupled device
System.
Background technique
As the energy and environmental crisis are more and more urgent, develop and using new energy increasingly by the weight of national governments
Depending on.Wherein safety, cleaning, reliable solar energy have become the important component of new energy, start to play in every field
Effect.Development and using solar energy generation technology be cope with the energy and environmental crisis important measure.In recent years, Chinese photovoltaic
Industry development is especially swift and violent, but while fast development, there is also many quality problems for power plant construction.
Power station determines its connection topology according to power, the voltage rating of inverter, and component forms certain electricity by series connection
Press the group string of range, several groups are got up forming array access inverter in series and parallel, and inverter carries out unified MPPT to array and controls
System.
The above-mentioned connection type in power station determines that the component electric current in its same group of string wants equal, and here it is the series connection couplings of system
It closes；Want equal with the group string voltage in an array, here it is the parallel coupleds of system.
If ideal situation, all components characteristic is all consistent in power station, then series coupled and parallel coupled, which will not be brought, asks
Topic, but the power station of actual motion can have many mismatch problems, such as vegetation, building, electric pole block, and damage, direction
It is inconsistent, manufacturing parameter is inconsistent etc.；These mismatch effects allow for system power generation under the action of system couples in series and parallel
Amount can be greatly reduced.
It is illustrated by taking series coupled as an example, such as 10 component series connection, wherein 9 components are all normal, maximums
Electric current is 10A at power points, and another component is received and blocked, and the electric current at maximum power point is 5A, because of 10 groups
Part is connected into a string, forms series coupled, and electric current must be equal, then there are two types of possible as a result, first is that all components
Electric current is all limited to 5A or 5A hereinafter, second is that the component being blocked is bypassed；But regardless of which kind of is as a result, all make system
Generated energy is greatly reduced.
For these reasons, the series coupled of deactivation system just becomes very necessary at mismatch component.
Utility model content
The utility model provides a kind of photovoltaic system with releasing series coupled device, can release mismatch photovoltaic group
Series coupled between part and adjacent component, lifting system generated energy.
In order to achieve the above object, the utility model adopts the following technical solutions:
A kind of photovoltaic system with releasing series coupled device, it is described including the photovoltaic group string that several are connected in parallel
Several photovoltaic group strings are connected in series by the equal photovoltaic module of quantity, and photovoltaic group string accesses electricity after connecting with inverter parallel
Net, further include several release series coupled devices, one non-isolation DC/DC converter built in the releasing series coupled device and
Equipped with No. 1 end line, No. 2 end lines and No. 3 three terminal wires of end line, the releasing series coupled device works in pairs, two releasing strings
Connection No. 1 of coupling device and No. 2 end lines are connected in parallel on the output end of mismatch photovoltaic module, meanwhile, No. 2 and No. 3 end lines are distinguished simultaneously
It is associated in the normal photovoltaic module output end of two adjacent with mismatch photovoltaic module.
It releases series coupled device and is transformed into No. 1 and No. 2 from normal photovoltaic module absorption energy by No. 2 and No. 3 end lines
End line output releases the series coupled of two inter-modules, lifting system hair to keep two concatenated photovoltaic module electric currents equal
Electricity.
Preferably, the non-isolation DC/DC converter is by two switching tubes, two derided capacitors, a storage capacitor
It is formed with an inductance, it is in parallel with storage capacitor after two derided capacitors series connection, after two switching tubes series connection
It is in parallel with storage capacitor, No. 2 end lines and an inductance, the other end of two derided capacitors are connected between described two derided capacitors
It is respectively equipped with No. 1 and No. 3 end lines, the another of the inductance is terminated between two switching tubes.
Series coupled device is released by the duty ratio of control DC/DC converter, so that normal photovoltaic component operation point is left
Move, transmitting energy is arrived there are the photovoltaic module of mismatch so that releasing photovoltaic system series coupled device 1 and 2 end line electric currents and
The sum of electric current of mismatch photovoltaic module in parallel is equal to No. 2 and No. 3 end line electric currents and normal photovoltaic module in parallel therewith therewith
The sum of electric current.
Preferably, the releasing series coupled device further includes voltage check device, current detection means and communication mould
Block.
Further, the photovoltaic system is additionally provided with central control unit, and the central control unit and photovoltaic group string are simultaneously
Connection, with the wired or wireless connection of communication module for releasing series coupled device, real-time display voltage and current information.
Preferably, each photovoltaic module is equipped with switching off device, the switch of switching off device is automatically controlled by central control unit,
The hand control switch on switching off device can also be controlled manually.It, can actively or passively in component main line failure
Turn off some photovoltaic module or photovoltaic group string.
The utility model has the following beneficial effects:
(1) the utility model can be with lifting system generated energy, effectively releasing series coupled, lifting system efficiency；
(2) the utility model is at low cost, it is only necessary to there are on the component of mismatch and inter-module adjacent thereto install release
Series coupled device, normal inter-module do not need to install；
(3) simple installation of the utility model, three end lines, easy to operate understandable altogether；
(4) the utility model installation does not influence the original Topology connection of system and work after releasing series coupled device.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram with the photovoltaic system for releasing series coupled device of the utility model；
Fig. 2 is the structural schematic diagram that non-isolation DC/DC converter composition releases series coupled device；
Fig. 3 is operating point schematic diagram after connecting there are mismatch problems component with normal component PV curve；
Fig. 4 is to install operating point schematic diagram after releasing series coupled device additional.
In figure: 10111、10112…101mnFor photovoltaic module；1021Series coupled device is released for No.1；1022It is No. two
Release series coupled device；103 be inverter；104 be power grid；105 be DC bus；ubusFor the input of gird-connected inverter direct current
Side bus voltage；p11、p12…pmnFor the output power of corresponding photovoltaic module；i11、i12…imnFor the output of corresponding photovoltaic module
Electric current；istring1、istring2…istringnThe electric current of corresponding photovoltaic group string.
Specific embodiment
The utility model is described further below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, a kind of with the photovoltaic system for releasing series coupled device, the photovoltaic group being connected in parallel including n
String, each photovoltaic group string are connected in series by m photovoltaic module.N photovoltaic group string is parallel to inverter by DC bus 105
103 input, while the output of inverter 103 accesses power grid 104, thus constitutes a photovoltaic system.In figure, mismatch photovoltaic group
Part 1012jAnd its there are two release series coupled device for installation on adjacent component.
No.1 releases series coupled device 1021No. 1 and No. 2 end lines be connected in parallel on mismatch photovoltaic module 1012jOutput end,
No. 2 and No. 3 end lines are connected in parallel on photovoltaic module 1011jOutput end；No. two releasing series coupled devices 1022No. 1 and No. 2 end lines
It is connected in parallel on mismatch photovoltaic module 1012jOutput end, No. 2 and No. 3 end lines are connected in parallel on photovoltaic module 1013jOutput end.
In the ideal case, each component of the photovoltaic system can realize MPPT, i.e., the output power p of each component11-
pmnAll it is equal, is all the peak power output pmax of condition lower component this moment.
But in actual motion, system can have a various mismatch effects, such as vegetation is blocked, towards inconsistent, damage
It is bad, manufacturing parameter is inconsistent, aging speed is inconsistent etc.；These mismatch effects can not only make the reduction of component power itself,
It can also be coupled by Cascade System, influence other assemblies connected in series, the system generated energy of causing substantially loses.
In the present embodiment, most components are normal, and it is 10A, the i.e. p1 of Fig. 3, Fig. 4 that electric current is exported at maximum power point
Point, due to component 1012jBy shadow occlusion, power is greatly reduced, at maximum power point export current reduction be 5A, i.e. Fig. 3,
The p2 point of Fig. 4, in conventional photovoltaic system, according to series coupled principle, component electric current connected in series can all be limited to 5A,
I.e. normal component can all work in the p3 point of Fig. 3, Fig. 4, so that system generated energy is greatly reduced.
By in component 1012jAnd component 101 adjacent thereto1j、1013jBetween releasing provided by the utility model is installed
Series coupled device can release component 1012jWith 1011j、1013jBetween series coupled because release photovoltaic system series connection
Coupling device can be from component 1011j、1013jIt extracts certain power and adds to component 1012j, so that three series component electric current phases
Deng relieving series coupled.
As shown in Fig. 2, non-isolation DC/DC converter is by two switching tubes Q1, Q2, two derided capacitors C1, C2, one is stored up
Energy capacitor C3 and an inductance L composition, it is in parallel with storage capacitor C3 after derided capacitors C1, C2 series connection, after switching tube Q1, Q2 series connection
It is in parallel with storage capacitor C3, No. 2 end lines and an inductance L are connected between derided capacitors C1, C2, the other end of derided capacitors C1 is set
There is No. 1 end line, the other end of derided capacitors C3 is equipped with No. 3 end lines, and the another of inductance L is terminated between switching tube Q1, Q2.
No. 1 and No. 2 end lines connect mismatch component, and No. 2 and No. 3 end lines meet normal component, switching tube Q1, Q2 complementation conducting, Q1
Duty ratio be D, then the duty ratio of Q2 be (1-D), according to topological structure it is found that Vpv1*D=Vpv2* (1-D).Legacy system
In, as shown in figure 3, the component that the operating point of entire group string can be stored in mismatch is limited because of series coupled, that is, work in p2
On the current value of point, so that system generated energy is greatly reduced；It installs additional after releasing series coupled device, by adjusting duty ratio, i.e.,
Reduce D, increases (1-D), so that energy is output to No. 2 and No. 3 end lines from No. 1 and No. 2 end lines, so that there are the realities of the component of mismatch
Border operating point is p2 or close to p2, and equivalent operation point becomes p4, and the operating point of No. 2 and the corresponding component of No. 3 end lines becomes p5,
P5 is reduced with respect to p1 voltage, electric current increases, and according to energy conservation principle, is had (Ip5-Ip4) * Vp5=(Ip4-Ip2) * Vp2, is made
String electric current must be organized to be substantially increased, effectively increase system generated energy.
Certainly, mounting means shown in Fig. 1 can only release mismatch component 1012jAnd the coupling of two series components adjacent thereto
It closes, the coupling of entire group string can not be released, but can largely reduce loss caused by the system of being coupled to, it is above
The data instance that face is enumerated, group string electric current can be increased to 8.33A from 5A, largely improve system generated energy.
The utility model provides a kind of photovoltaic system with releasing series coupled device, will release series coupled device
It is installed on there are between the component of mismatch and adjacent component, is converted by inter-module energy, realize that component equivalent exports electric current
It is equal, the series coupled of inter-module is relieved, with extremely low cost, realizes being substantially improved for system generated energy.
Basic principles, main features, and advantages of the present invention has been shown and described above.Current row
The technical staff of industry is described in above embodiments and description it should be appreciated that the present utility model is not limited to the above embodiments
Only illustrate the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model, the utility model is also
It will have various changes and improvements, these various changes and improvements fall within the scope of the claimed invention.The utility model
Claimed range is defined by the appending claims and its equivalent thereof.
Claims (6)
1. it is a kind of with the photovoltaic system for releasing series coupled device, including the photovoltaic group string that several are connected in parallel, if described
A dry photovoltaic group string is connected in series by the equal photovoltaic module of quantity, and photovoltaic group string accesses electricity after connecting with inverter parallel
Net, it is characterised in that:
It further include that several release series coupled device, one non-isolation DC/DC converter built in the releasing series coupled device
And No. 1 end line, No. 2 end lines and No. 3 three terminal wires of end line are equipped with, the releasing series coupled device works in pairs, two releasings
No. 1 of series coupled device and No. 2 end lines are connected in parallel on the output end of mismatch photovoltaic module, meanwhile, No. 2 and No. 3 end lines difference
It is connected in parallel on the output end of the normal photovoltaic module of two adjacent with mismatch photovoltaic module.
2. according to claim 1 with the photovoltaic system for releasing series coupled device, it is characterised in that: described non-isolated
DC/DC converter is made of two switching tubes, two derided capacitors, a storage capacitor and an inductance, and described two points
It is in parallel with storage capacitor after voltage capacitance series connection, described two partial pressures in parallel with storage capacitor after two switching tubes series connection
No. 2 end lines and an inductance are connected between capacitor, the other end of two derided capacitors is respectively equipped with No. 1 end line and No. 3 end lines, institute
The another of inductance is stated to be terminated between two switching tubes.
3. according to claim 1 with the photovoltaic system for releasing series coupled device, it is characterised in that: the releasing string
Joining coupling device further includes voltage check device, current detection means and communication module.
4. according to claim 3 with the photovoltaic system for releasing series coupled device, it is characterised in that: the photovoltaic system
System is additionally provided with central control unit, and the central control unit and photovoltaic group are series-parallel, with the communication for releasing series coupled device
Module passes through wired or wireless connection, real-time display voltage and current information.
5. according to claim 4 with the photovoltaic system for releasing series coupled device, it is characterised in that: each photovoltaic group
Part is equipped with switching off device, and the switch of switching off device is automatically controlled by central control unit.
6. according to claim 5 with the photovoltaic system for releasing series coupled device, it is characterised in that: the switching off device
On be additionally provided with hand control switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820776832.6U CN208257429U (en) | 2018-05-23 | 2018-05-23 | A kind of photovoltaic system with releasing series coupled device |
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| CN201820776832.6U CN208257429U (en) | 2018-05-23 | 2018-05-23 | A kind of photovoltaic system with releasing series coupled device |
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| CN208257429U true CN208257429U (en) | 2018-12-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114244247A (en) * | 2021-11-03 | 2022-03-25 | 中国华能集团清洁能源技术研究院有限公司 | Photovoltaic system and wind-solar hybrid power station |
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2018
- 2018-05-23 CN CN201820776832.6U patent/CN208257429U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114244247A (en) * | 2021-11-03 | 2022-03-25 | 中国华能集团清洁能源技术研究院有限公司 | Photovoltaic system and wind-solar hybrid power station |
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