CN105187004B - A kind of photovoltaic generation counter current protection - Google Patents
A kind of photovoltaic generation counter current protection Download PDFInfo
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- CN105187004B CN105187004B CN201510610022.4A CN201510610022A CN105187004B CN 105187004 B CN105187004 B CN 105187004B CN 201510610022 A CN201510610022 A CN 201510610022A CN 105187004 B CN105187004 B CN 105187004B
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- reverse current
- photovoltaic panel
- photovoltaic
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- current detection
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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 discloses a kind of photovoltaic generation counter current protection, including：One counterflow-preventing electronic box, the counterflow-preventing electronic box are provided with some terminals, and executive component is provided between photovoltaic panel access terminal described in each pair, photovoltaic panel is connected with the photovoltaic panel access terminal, reverse current detection table is provided with the counterflow-preventing electronic box；One reverse current detects controller, and the reverse current detection controller is connected with the anti-reverse current case；One AC network, string has current transformer on the AC network, and the current transformer is connected with the reverse current detection table.Through the above way; a kind of photovoltaic generation counter current protection of the present invention, the device overcome common protection device single can only open, whole photovoltaic panels of breaking the defects of, the access quantity of photovoltaic panel can be finely controlled; the utilization rate of photovoltaic panel is reached maximization, improve the utilization rate of photovoltaic panel.
Description
Technical field
The invention belongs to be controlled automatically at the application of photovoltaic art, and in particular to a kind of photovoltaic generation reverse-current protection dress
Put.
Background technology
Grid-connected reverse current guard system is generally used for the reverse-power protection function in photovoltaic plant, and reverse-power protection device is
Important component in " irreversible grid-connected system ", the low pressure that most of small-sized photovoltaic power station access voltage class are 0.4kV
Power network, essentially user side self-contained type power-supply system, generate power for their own use when there is the sun, use electric network source during no sun, not to
Power network is fed, and so, reverse-power protection function, which turns into, effectively prevents photovoltaic system from being fed to power network, ensures whole system power network product
The important means of matter, and the photovoltaic inversion waveform of user terminal is also without very strict examination ＆ verification.
Cost of access can be than relatively low with supporting dynamics gradual increase of the country to new energy especially photovoltaic generation, state
Interior grid-connected engineering gradually increases.
National industry regulation has clear and definite technical requirements to photovoltaic access standard, and in July, 2009, State Grid Corporation of China prints and distributes
《State Grid Corporation of China's photovoltaic plant access electric power network technique regulation (tentative)》Notice, it is specified that photovoltaic plant access power network
General specification is, it is specified that require:When design of photovoltaic power station is irreversible synchronizing mode, reverse-power protection equipment should be configured,
When detecting that backward current exceedes the 5% of rated output, photovoltaic plant should stop in 0.5~2s to power network line power transmission.Institute
So that counterflow-preventing protection device is the indispensable part of photovoltaic plant.
Traditional reverse-current protection device single can only be opened, whole photovoltaic panels of breaking, and reverse current only be detected, more than setting value
When, photovoltaic panel is all cut off, power network electricity is used instead, has spent certain time, then photovoltaic panel all is thrown, if the sun is still
So prosperous, electricity still exceedes setting value, cuts off whole photovoltaic panels again, photovoltaic panel is when generating electricity powerful, but by by force
Cut-out, utilization rate decline.
The content of the invention
The present invention solves the technical problem of a kind of photovoltaic generation counter current protection is provided, the device can
To finely control the access quantity of photovoltaic panel, the utilization rate of photovoltaic panel is set to reach maximization.
In order to solve the above technical problems, one aspect of the present invention is：A kind of photovoltaic generation reverse-current protection
Device, including：
One counterflow-preventing electronic box, the counterflow-preventing electronic box are provided with some terminals, the terminal include IA ﹢ terminals, IA terminals,
IB ﹢ terminals, IB terminals, IC ﹢ terminals, IC terminals, UC terminals, No. 1 terminal and some to photovoltaic panel access terminal, light described in each pair
Executive component is installed between volt plate access terminal, photovoltaic panel, the counterflow-preventing electricity are connected with the photovoltaic panel access terminal
Reverse current detection table is installed in case；
One reverse current detects controller, reverse current detection controller by the UC terminals and No. 1 terminal with
The anti-reverse current case is connected；
One AC network, string has current transformer on the AC network, and the current transformer is examined with the reverse current
Survey table is connected.
In a preferred embodiment of the present invention, the reverse current detects controller by master element and man-machine interface group
Into.
In a preferred embodiment of the present invention, the species of the executive component includes contactor and noncontacting switch.
In a preferred embodiment of the present invention, the way of the photovoltaic panel and the logarithm phase of photovoltaic panel access terminal
Together.
In a preferred embodiment of the present invention, the photovoltaic panel quantity is 6 tunnels.
The beneficial effects of the invention are as follows：A kind of photovoltaic generation counter current protection of the present invention, the device overcome commonly
The defects of protection device single can only open, whole photovoltaic panels of breaking, the reverse current detection controller in device detected within 2 second time
Reverse current size, and the road for accessing or cutting out corresponding photovoltaic panel according to the reverse current percentage of national regulation is ordered therewith
Number, so as to finely control the access quantity of photovoltaic panel, makes the utilization rate of photovoltaic panel reach maximization, improves the utilization of photovoltaic panel
Rate.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of photovoltaic generation counter current protection.
Fig. 2 is that a kind of reverse current of photovoltaic generation counter current protection detects controller principle block diagram.
The mark of each part is as follows in accompanying drawing：1st, counterflow-preventing electronic box；2nd, reverse current detection controller；3rd, photovoltaic panel；4th, light
Lie prostrate plate access terminal；5th, executive component；6th, current transformer；7th, master element；8th, man-machine interface；9th, reverse current detection table.
Embodiment
Presently preferred embodiments of the present invention is described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, apparent is clearly defined so as to be made to protection scope of the present invention.
Fig. 1 and Fig. 2 are referred to, the embodiment of the present invention includes：A kind of photovoltaic generation counter current protection, including：
One counterflow-preventing electronic box 1, the counterflow-preventing electronic box 1 are provided with some terminals, and the terminal includes IA ﹢ terminals, IA ends
Son, IB ﹢ terminals, IB terminals, IC ﹢ terminals, IC terminals, UC terminals, No. 1 terminal and it is some to photovoltaic panel access terminal 4, the UC
Terminal and No. 1 terminal be for connecting reverse current detection controller 2, during this 2 short circuits, the executive component 5
Closure, device work, conversely, then the executive component 5 disconnects, photovoltaic system departs from grid-connected.
Executive component 5 is installed between photovoltaic panel access terminal 4 described in each pair, the executive component 5 be contactor or
Noncontacting switch.
Photovoltaic panel 3 is connected with the photovoltaic panel access terminal 4, number and the photovoltaic panel of the photovoltaic panel 3 access
The logarithm of terminal 4 is identical, and the quantity of photovoltaic panel 3 described in the present embodiment is 6 tunnels.
Reverse current detection table 9 is installed in the counterflow-preventing electronic box 1, according to the difference of size of current, the IA ﹢ terminals,
Also need to pacify on the IA terminals, the IB ﹢ terminals, the IB terminals, the IC ﹢ terminals, the IC terminals and the UC terminals
Equipped with line nose, design (calculated) load capacity is 75KW, electric current 150A, it is proposed that with 50mm2Cable, the line nose use 50mm2Line nose.
One reverse current detects controller 2, and it is big that the reverse current detection controller 2 can detect reverse current within 2 second time
It is small, and the way for accessing or cutting out the corresponding photovoltaic panel 3 according to the reverse current percentage of national regulation is ordered therewith.
The reverse current detection controller 2 passes through the UC terminals and No. 1 terminal and the anti-phase of reverse current case 1
Even, reverse current detection controller 2 is made up of master element 7 and man-machine interface 8, and the master element 7 is single chip microcomputer, institute
State reverse current detection table 9 to be sent to data in single chip microcomputer in time, by after single chip microcomputer computing sending instructions to the execution
Element 5 and the man-machine interface 8, so as to it is into and out to photovoltaic system it is grid-connected be controlled, the man-machine interface 8 is also used for
Set the task of the parameter of various needs.
One AC network, string has current transformer 6, the current transformer 6 and the reverse current on the AC network
Detection table 9 is connected, the secondary line of the current transformer 6 and the IA ﹢ terminals on the counterflow-preventing electronic box 1, the IA
Terminal, the IB ﹢ terminals, the IB terminals, the IC ﹢ terminals and the IC terminals are corresponding to be connected.
During use when the reverse current that the reverse current detection table 9 detects exceedes upper limit set value, the executive component 5
The photovoltaic panel 3 all the way is disconnected immediately, and the reverse current detects controller 2 again compared with setting value, if the reverse current is examined
The reverse current that survey table 9 detects also surpasses the setting value, and the executive component 5 then disconnects the photovoltaic panel 3 all the way again, until described
Untill the reverse current that reverse current detection table 9 detects is less than upper limit set value；
If the reverse current that the reverse current detection table 9 detects is less than lower limit set value, the executive component 5 closes immediately
On the photovoltaic panel 3 all the way, the reverse current detection controller 2 is again compared with the setting value, until reverse current detection table 9
The reverse current detected keeps steady-working state to stop between set bound.
Compared with prior art, a kind of photovoltaic generation counter current protection of the present invention, the device overcome common protection
The defects of device single can only open, whole photovoltaic panels of breaking, the reverse current detection controller in device detects inverse electric within 2 second time
Size is flowed, and orders the way for accessing or cutting out corresponding photovoltaic panel according to the reverse current percentage of national regulation therewith,
So as to finely control the access quantity of photovoltaic panel, the utilization rate of photovoltaic panel is reached maximization, improve the utilization rate of photovoltaic panel.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (5)
- A kind of 1. photovoltaic generation counter current protection, it is characterised in that including：One counterflow-preventing electronic box, the counterflow-preventing electronic box are provided with some terminals, and the terminal includes IA ﹢ terminals, IA terminals, IB ﹢ Terminal, IB terminals, IC ﹢ terminals, IC terminals, UC terminals, No. 1 terminal and some to photovoltaic panel access terminal, photovoltaic described in each pair Executive component is installed between plate access terminal, photovoltaic panel, the counterflow-preventing electronic box are connected with the photovoltaic panel access terminal Reverse current detection table is inside installed；One reverse current detects controller, reverse current detection controller by the UC terminals and No. 1 terminal with it is described Anti- reverse current case is connected；One AC network, string has current transformer, the current transformer and reverse current detection table on the AC network It is connected；During use when the reverse current that the reverse current detection table detects exceedes upper limit set value, the executive component breaks immediately The photovoltaic panel all the way is opened, the reverse current detects controller again compared with setting value, if reverse current detection table detection To reverse current also surpass the setting value, the executive component then disconnects the photovoltaic panel all the way again, until the reverse current detect Untill the reverse current that table detects is less than upper limit set value；If the reverse current that the reverse current detection table detects is less than lower limit set value, the executive component closes all the way immediately The photovoltaic panel, the reverse current detection controller compared with the setting value, detect up to the reverse current detection table again Reverse current keeps steady-working state to stop between set bound.
- A kind of 2. photovoltaic generation counter current protection according to claim 1, it is characterised in that：The reverse current detection Controller is made up of master element and man-machine interface.
- A kind of 3. photovoltaic generation counter current protection according to claim 1, it is characterised in that：The executive component Species includes contactor and noncontacting switch.
- A kind of 4. photovoltaic generation counter current protection according to claim 1, it is characterised in that：The road of the photovoltaic panel Number is identical with the logarithm of photovoltaic panel access terminal.
- A kind of 5. photovoltaic generation counter current protection according to claim 1, it is characterised in that：The photovoltaic panel quantity For 6 tunnels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510610022.4A CN105187004B (en) | 2015-09-23 | 2015-09-23 | A kind of photovoltaic generation counter current protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510610022.4A CN105187004B (en) | 2015-09-23 | 2015-09-23 | A kind of photovoltaic generation counter current protection |
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| Publication Number | Publication Date |
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| CN105187004A CN105187004A (en) | 2015-12-23 |
| CN105187004B true CN105187004B (en) | 2017-11-21 |
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| CN201510610022.4A Active CN105187004B (en) | 2015-09-23 | 2015-09-23 | A kind of photovoltaic generation counter current protection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107069798B (en) * | 2017-01-17 | 2023-05-09 | 陕西科技大学 | Control method and system for distributed photovoltaic power generation system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958555A (en) * | 2010-08-31 | 2011-01-26 | 山东力诺太阳能电力工程有限公司 | Intelligent control system and method of photovoltaic grid-connected power station |
| CN202978296U (en) * | 2012-11-29 | 2013-06-05 | 浙江永升新能源科技有限公司 | Photovoltaic inverter backflow prevention system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012182868A (en) * | 2011-02-28 | 2012-09-20 | Kyocera Corp | Photovoltaic power generator |
| CN202353229U (en) * | 2011-09-30 | 2012-07-25 | 天津永明新能源科技有限公司 | Grid-connected photovoltaic power supply reverse-power prevention device |
| CN102780233A (en) * | 2012-08-08 | 2012-11-14 | 中盛光电能源股份有限公司 | Large-scale distributed photovoltaic power station user-side grid countercurrent-preventive system |
| CN205081751U (en) * | 2015-09-23 | 2016-03-09 | 常熟市宏宇水电设备工程有限责任公司 | Photovoltaic power generation counter current protection device |
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2015
- 2015-09-23 CN CN201510610022.4A patent/CN105187004B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958555A (en) * | 2010-08-31 | 2011-01-26 | 山东力诺太阳能电力工程有限公司 | Intelligent control system and method of photovoltaic grid-connected power station |
| CN202978296U (en) * | 2012-11-29 | 2013-06-05 | 浙江永升新能源科技有限公司 | Photovoltaic inverter backflow prevention system |
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| CN105187004A (en) | 2015-12-23 |
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 215500 Jiangsu city of Suzhou province Changshou City Yushan High-tech Industrial Park No. 5 Taizhou Road Applicant after: Changshou City Hongyu Electric Power Engineering Company Limited Address before: 215500 Jiangsu city of Suzhou province Changshou City Yushan High-tech Industrial Park No. 5 Taizhou Road Applicant before: CHANGSHU HONGYU HYDROELECTRIC EQUIPMENT ENGINEERING CO., LTD. |
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| CB03 | Change of inventor or designer information | ||
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Inventor after: Wang Weiping Inventor after: Shi Dingliang Inventor before: Wang Weiping |
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