CN203607863U - A photovoltaic grid-connected countercurrent-prevention system - Google Patents
A photovoltaic grid-connected countercurrent-prevention system Download PDFInfo
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- CN203607863U CN203607863U CN201320679467.4U CN201320679467U CN203607863U CN 203607863 U CN203607863 U CN 203607863U CN 201320679467 U CN201320679467 U CN 201320679467U CN 203607863 U CN203607863 U CN 203607863U
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- countercurrent
- electric meter
- counterflow
- grid
- inverter
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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 discloses a photovoltaic grid-connected countercurrent-prevention system comprising an intelligent electric meter connected with a power grid and used for detecting current and voltage, a countercurrent-prevention controller with an input end connected with the intelligent electric meter, at least one inverter connected to an output end of the countercurrent-prevention controller in parallel, a switch to which output ends of the inverters are connected in parallel, and a load connected with the grid electric meter and the switch. An input end of the switch is connected with the output end of the countercurrent-prevention controller and input ends of the inverters are connected with a photovoltaic solar assembly. The intelligent electric meter used for detecting current and voltage is connected with the countercurrent-prevention controller, so that the additional installation of a mutual inductor for sending current signals to the countercurrent-prevention controller is not needed. Meanwhile, the voltage detection sampling is facilitated and the countercurrent-prevention device is simplified.
Description
Technical field
The utility model relates to anti-backflow device, relates in particular to a kind of grid-connected countercurrent prevention system.
Background technology
Along with the support of country to new forms of energy especially photovoltaic generation, relevant support policy is put into effect successively, domestic photovoltaic power generation apparatus is more and more installed and is come into operation, and certainly will introduce the destabilizing factors such as harmonic wave and causes the impact on electrical network but a large amount of photovoltaic systems is connected to the grid.Anti-backflow device is a kind of device that overcomes these unstable factors.
Existing common counterflow-preventing method is by the electric current and voltage of detection of grid side, once find to electrical network input current, can send immediately control inverter and reduce output current, subtract low power instruction, in the time there is communication failure or other system fault, control contactor disconnects, thoroughly to stop to mains supply; After backward current disappears, then reconnect inverter and electrical network, or progressively increase the power output of photovoltaic DC-to-AC converter by algorithm.
There is following shortcoming in above-mentioned existing method: one, need external impressed current instrument transformer to sample respectively to electric current and voltage, and cabling complexity, and electric current and voltage sample line cabling is lack of standardization, and easily disturbed.Two, while current transformer being installed, likely also need first power distribution equipment to be dismantled, engineering construction is very loaded down with trivial details.Even if three close the power supply of inverter and anti-backflow device, if load still has Power operation, instrument transformer is secondary still has electric current to introduce counterflow-preventing controller circuit board, cause very large trouble for Maintenance and Repair counterflow-preventing controller, there is Danger Electric shock risk, once and instrument transformer open circuit, have the possibility of damage.
Utility model content
The utility model provides a kind of simple in structure, safety and stability, grid-connected countercurrent prevention system easy for installation for the problems referred to above.
The technical scheme the utility model proposes is, design a kind of grid-connected countercurrent prevention system, comprise: be connected and can detect the intelligent electric meter of current/voltage, counterflow-preventing controller that input is connected with described intelligent electric meter, at least one inverter, the switch of described each inverter output end access in parallel, the load being connected respectively with described electrical network ammeter and switch of the output of the described counterflow-preventing controller of access in parallel respectively with electrical network, described switch input terminal is also connected with counterflow-preventing controller output end, and described inverter input is connected with photovoltaic solar assembly.
In the utility model one embodiment, in described counterflow-preventing controller, be provided with display unit.
Described inverter, counterflow-preventing controller are connected by serial communication bus with intelligent electric meter.
Described intelligent electric meter is provided with serial communication interface.
Described serial communication bus can be RS485, CAN or Ethernet.
Compared with prior art, the beneficial effects of the utility model are: one, the utility model adopts the intelligent electric meter that can detect electric current and voltage to be connected with counterflow-preventing controller, save extra installation instrument transformer and arrived counterflow-preventing controller to current signal, also facilitated voltage detecting sampling simultaneously, guarantee the precise control of anti-backflow device, allowed anti-backflow device more simplify.Two, the utility model switch of connecting between inverter and load, and the input of switch is connected with counterflow-preventing controller, in the time that anti-backflow device breaks down, counterflow-preventing controller cuts out inverter by cutting off switch, then the power supply and the connection that disconnect anti-backflow device can overhaul, now complete no current in counterflow-preventing controller circuitry, has fully guaranteed the fail safe of Maintenance and Repair.
Accompanying drawing explanation
Below in conjunction with embodiment and accompanying drawing, the utility model is elaborated, wherein:
Fig. 1 is circuit connection diagram of the present utility model.
Embodiment
As shown in Figure 1, the grid-connected countercurrent prevention system that the utility model one embodiment proposes, comprise: be connected with electrical network and intelligent electric meter that can current/voltage, counterflow-preventing controller that input is connected with intelligent electric meter, at least one inverter, the switch that described each inverter output end parallel connection accesses, the load being connected respectively with electrical network ammeter and switch of the output of access counterflow-preventing controller in parallel respectively, switch input terminal is also connected with counterflow-preventing controller output end, and inverter input is connected with photovoltaic solar assembly.
In the present embodiment, counterflow-preventing controller reads intelligent electric meter power information in real time, intelligent electric meter can detect electric current, voltage the moment, meanwhile, has also facilitated the detection sampling of electric current, voltage, has guaranteed that whole anti-backflow device is simple in structure, quick for installation; Counterflow-preventing controller with the communication of inverter, and with the situation of intelligent electric meter communication failures under, can send out control command to switch, close inverter by cut-off switch, thoroughly to cut off circuit loop, guarantee the fail safe of the operation operation and maintenance maintenance of earning an anti-backflow device.
In counterflow-preventing controller, be provided with display unit, display unit sends early warning so that maintenance in time, and display unit can be LED display or LCD display, is arranged on counterflow-preventing controller panel, to show that error message reminds; Display unit also can be made as light-emitting component, reminds with glow color; In practical application, can select as required the type of display unit.
Concrete use procedure is as follows, and device counterflow-preventing controller reads after the detection information of intelligent electric meter, once find that net side power has inverse probability to produce, can send control command by serial communication and be given to inverter, and control inverter reduces power output; Otherwise if bearing power strengthens, the forward power that intelligent electric meter detects raises, and sends control command by serial communication and is given to inverter, control inverter increases power output.Regulate the power output of inverter by the method for this detection bearing power, follow bearing power variation to reach inverter power.The process of this continuous adjustment inverter power, avoided because of local load consumption not unnecessary electric weight pour into electrical network and form adverse current.
Above-described is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; all equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and attached content to do; or the direct counterflow-preventing field that is indirectly used in other, be all in like manner included in scope of patent protection of the present utility model.
Claims (5)
1. a grid-connected countercurrent prevention system, it is characterized in that comprising: be connected and can detect the intelligent electric meter of current/voltage, counterflow-preventing controller that input is connected with described intelligent electric meter, at least one inverter, the switch of described each inverter output end access in parallel, the load being connected respectively with described electrical network ammeter and switch of the output of the described counterflow-preventing controller of access in parallel respectively with electrical network, described switch input terminal is also connected with counterflow-preventing controller output end, and described inverter input terminal is connected with photovoltaic solar assembly.
2. grid-connected countercurrent prevention system as claimed in claim 1, is characterized in that, in described counterflow-preventing controller, is provided with display unit.
3. grid-connected countercurrent prevention system as claimed in claim 1, is characterized in that, described inverter, counterflow-preventing controller are connected by serial communication bus with intelligent electric meter.
4. grid-connected countercurrent prevention system as claimed in claim 1, is characterized in that, described intelligent electric meter is provided with serial communication interface.
5. grid-connected countercurrent prevention system as claimed in claim 3, is characterized in that, described serial communication bus can be RS485, CAN or Ethernet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320679467.4U CN203607863U (en) | 2013-10-31 | 2013-10-31 | A photovoltaic grid-connected countercurrent-prevention system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320679467.4U CN203607863U (en) | 2013-10-31 | 2013-10-31 | A photovoltaic grid-connected countercurrent-prevention system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203607863U true CN203607863U (en) | 2014-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320679467.4U Expired - Fee Related CN203607863U (en) | 2013-10-31 | 2013-10-31 | A photovoltaic grid-connected countercurrent-prevention system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385235A (en) * | 2016-09-18 | 2017-02-08 | 阳光电源股份有限公司 | Reverse connection detection method and device for feed network point detection device |
| CN113013922A (en) * | 2021-03-12 | 2021-06-22 | 深圳益邦阳光有限公司 | Anti-reflux method and device, electronic equipment and storage medium |
| CN115224742A (en) * | 2022-09-21 | 2022-10-21 | 赫里欧绿能建筑科技有限公司 | BIPV photovoltaic power generation convergence grid-connected system and method |
| CN117607601A (en) * | 2024-01-24 | 2024-02-27 | 苏州腾圣技术有限公司 | Testing device for anti-countercurrent test of grid-connected inverter |
| CN118523406A (en) * | 2024-05-09 | 2024-08-20 | 上海思格源智能科技有限公司 | Inverter system, control method and device for inverter system |
-
2013
- 2013-10-31 CN CN201320679467.4U patent/CN203607863U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385235A (en) * | 2016-09-18 | 2017-02-08 | 阳光电源股份有限公司 | Reverse connection detection method and device for feed network point detection device |
| CN106385235B (en) * | 2016-09-18 | 2018-07-03 | 阳光电源股份有限公司 | Present site detection device reversal connection detection method and reversal connection detection device |
| CN113013922A (en) * | 2021-03-12 | 2021-06-22 | 深圳益邦阳光有限公司 | Anti-reflux method and device, electronic equipment and storage medium |
| CN115224742A (en) * | 2022-09-21 | 2022-10-21 | 赫里欧绿能建筑科技有限公司 | BIPV photovoltaic power generation convergence grid-connected system and method |
| CN115224742B (en) * | 2022-09-21 | 2022-12-20 | 赫里欧绿能建筑科技有限公司 | BIPV photovoltaic power generation convergence grid-connected system and method |
| CN117607601A (en) * | 2024-01-24 | 2024-02-27 | 苏州腾圣技术有限公司 | Testing device for anti-countercurrent test of grid-connected inverter |
| CN118523406A (en) * | 2024-05-09 | 2024-08-20 | 上海思格源智能科技有限公司 | Inverter system, control method and device for inverter system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN JINGFUYUAN TECH. CO., LTD. Free format text: FORMER NAME: SHENZHEN JINGFUYUAN TECHNOLOGY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: Shenzhen Nanshan District City, Guangdong province 518000 white pine Luxili Nangang Second Industrial Park 12 Building 1, 2, 5 floor Patentee after: SHENZHEN JINGFUYUAN TECHNOLOGY CO., LTD. Address before: Shenzhen Nanshan District City, Guangdong province 518000 white pine Luxili Nangang Second Industrial Park 12 Building 1, 2, 5 floor Patentee before: Shenzhen Jingfuyuan Tech Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140521 Termination date: 20161031 |
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| CF01 | Termination of patent right due to non-payment of annual fee |