CN201601501U - Photovoltaic grid-connected generation anti-countercurrent device - Google Patents
Photovoltaic grid-connected generation anti-countercurrent device Download PDFInfo
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- CN201601501U CN201601501U CN2009201339169U CN200920133916U CN201601501U CN 201601501 U CN201601501 U CN 201601501U CN 2009201339169 U CN2009201339169 U CN 2009201339169U CN 200920133916 U CN200920133916 U CN 200920133916U CN 201601501 U CN201601501 U CN 201601501U
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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 relates to a photovoltaic grid-connected generation anti-countercurrent device, which is used for a photovoltaic grid-connected power system and comprises a control circuit, and a switch circuit and a detection circuit which are respectively and electrically connected with the control circuit. The switch circuit is connected with an output end of a solar power supply device so as to switch on or off the solar power supply device, the detection circuit is used for detecting on-load current and countercurrent and transmitting detection signals to the control circuit, and the control circuit is used for controlling switching on or off of the switch circuit. The photovoltaic grid-connected generation anti-countercurrent device in application can effectively avoid possible countercurrent in combined supply of solar energy and mains supply, and avoid instability of a mains grid and possible harmonic pollution. The photovoltaic grid-connected generation anti-countercurrent device is simple in control, convenient in installation and stronger applicability.
Description
Technical field
The utility model relates to anti-backflow device, more particularly, relates to a kind of parallel network power generation anti-backflow device.
Background technology
The adverse current electric current is meant when solar power supply apparatus produces dump power sends this electric energy into utility grid, owing to be opposite with the mains-supplied direction, so be called the adverse current electric current.When the electric power that produces when solar power supply apparatus is not enough, then by mains-supplied.In present stage, department's power department is worried can cause the instability of utility grid and produce harmonic pollution after solar power supply apparatus is incorporated civil power into, simultaneously the solar power supply apparatus electric weight that is produced that generates electricity by way of merging two or more grid systems is a non-scheduling, therefore, can the solar power supply apparatus problem that incorporate utility grid into have become one of major issue of the solar powered development of restriction present stage.Be badly in need of a kind of parallel network power generation anti-backflow device at present, when solar power supply apparatus produces dump energy for a certain reason, can handled or abandon, prevent the situation of solar power supply apparatus to the utility grid transmission of electricity by some means.
The utility model content
The technical problems to be solved in the utility model is, when uniting power supply at the solar power supply apparatus of prior art and civil power, exists solar power supply apparatus to think the defective of utility grid feed, and a kind of parallel network power generation anti-backflow device is provided.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of parallel network power generation anti-backflow device, the system that is used for solar power supply apparatus and city's electricity parallel operation, described parallel network power generation anti-backflow device comprises control circuit, and the switching circuit and the testing circuit that are electrically connected respectively with described control circuit; Wherein, described switching circuit is connected with the output of described solar energy functional device, with conducting or turn-off described solar power supply apparatus; Described testing circuit is used to detect load current and adverse current electric current and detection signal is sent to described control circuit; Described control circuit is used to control the conducting or the shutoff of described switching circuit.
In parallel network power generation anti-backflow device described in the utility model, described switching circuit is the circuit breaker of charged pneumatic operating mechanism.
In parallel network power generation anti-backflow device described in the utility model, described testing circuit mainly is made up of current transformer, current relay and power relay, wherein, described current transformer is used to detect load current, power relay is used to detect the performance number of adverse current electric current, and described current relay is connected with the secondary side of described current transformer.
In parallel network power generation anti-backflow device described in the utility model, the detection range of described power relay is 5.92KW～118.4KW.
In parallel network power generation anti-backflow device described in the utility model, described control circuit is the electric component logic control circuit.
Implement parallel network power generation anti-backflow device of the present utility model, has following beneficial effect: by detecting load current and adverse current electric current, judge whether to exist solar power supply apparatus that the civil power electrical network is gone in the dump energy feedback, thereby the conducting or the shutoff of control solar power supply apparatus, avoid solar energy and civil power to unite power supply effectively and the adverse current phenomenon may occur, and avoided the instability and the issuable harmonic pollution of utility grid.This device control is simple, and easy for installation, applicability is more intense.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the schematic block circuit diagram of the utility model parallel network power generation anti-backflow device.
Embodiment
The technical solution of the utility model mainly is by the load current in the detection grid-connected system and the power of adverse current electric current, compares with preset value then, correspondingly controls solar power supply apparatus according to result relatively again and whether inserts power supply circuits.
As shown in Figure 1, at parallel network power generation anti-backflow device of the present utility model, it is used for the system of solar power supply apparatus and city's electricity parallel operation, the electric current that solar power supply apparatus and civil power produce is all powered to load equipment by inverter, wherein, this parallel network power generation anti-backflow device comprises control circuit, and the switching circuit and the testing circuit that are electrically connected respectively with control circuit; Switching circuit is connected between civil power and the inverter, bridger as the solar energy functional device, and testing circuit is connected between load and the civil power, thereby detect load current and adverse current electric current respectively, and the detection signal as a result that will detect sends to control circuit, control circuit is according to detection signal, the conducting of control switch circuit or shutoff, that is:
The condition of switching circuit conducting:
When 1, Yun Hang load value is greater than default load value, by the regular hour time-delay, the Closing Switch circuit, solar power supply apparatus is incorporated utility grid into;
When 2, countercurrent electric not occurring and flow to the utility grid feed, by the regular hour time-delay, the Closing Switch circuit, solar power supply apparatus is incorporated utility grid into.
The condition that switching circuit turn-offs:
When 1, Yun Hang load value is less than default load value, by must time delays, the stopcock circuit, solar power supply apparatus breaks away from utility grid;
When 2, countercurrent electric occurring and flow to the utility grid feed and carry, by must time delays, the stopcock circuit, solar power supply apparatus breaks away from utility grid.
In a preferred embodiment, switching circuit can be the circuit breaker of charged pneumatic operating mechanism.Testing circuit mainly is made up of current transformer, current relay and power relay, wherein, described current transformer is used to detect load current, and power relay is used to detect the performance number of adverse current electric current, and described current relay is connected with the secondary side of described current transformer.Current transformer must be sensed the current value that inverter outputs to load end, and the secondary side of current relay and power relay summation current transformer forms return lead.Because the secondary side current of current transformer is lower, therefore three kinds of as close as possible installations of device reduce line loss, could guarantee the precision of anti-backflow device like this.In a preferred embodiment, the detection range of power relay is 5.92KW～118.4KW.Control circuit can be the electric component logic control circuit.
This parallel network power generation anti-backflow device can also pass through following dual mode:
1, gathers the data of the electric energy meter of band communication interface, realize the parallel network power generation anti-backflow device by single-chip microcomputer.
2, the data acquisition system that carries by grid-connected photovoltaic system derives related data and realizes the parallel network power generation anti-backflow device by single-chip microcomputer.
The control precision of above dual mode is higher, can free adjustment the scope of control bigger, but comparatively speaking, applicability is little, need meet some requirements to use.
The utility model describes by several specific embodiments, it will be appreciated by those skilled in the art that, under the situation that does not break away from the utility model scope, can also carry out various conversion and be equal to alternative the utility model.In addition, at particular condition or concrete condition, can make various modifications to the utility model, and not break away from scope of the present utility model.Therefore, the utility model is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the utility model claim scope.
Claims (5)
1. a parallel network power generation anti-backflow device is used for grid-connected photovoltaic system, it is characterized in that, described parallel network power generation anti-backflow device comprises control circuit, and the switching circuit and the testing circuit that are electrically connected respectively with described control circuit; Wherein, described switching circuit is connected with the output of described solar power supply apparatus, with conducting or turn-off described solar power supply apparatus; Described testing circuit is used to detect load current and adverse current electric current and detection signal is sent to described control circuit; Described control circuit is used to control the conducting or the shutoff of described switching circuit.
2. parallel network power generation anti-backflow device according to claim 1 is characterized in that, described switching circuit is the circuit breaker of charged pneumatic operating mechanism.
3. parallel network power generation anti-backflow device according to claim 1, it is characterized in that, described testing circuit mainly is made up of current transformer, current relay and power relay, wherein, described current transformer is used to detect load current, power relay is used to detect the performance number of adverse current electric current, and described current relay is connected with the secondary side of described current transformer.
4. parallel network power generation anti-backflow device according to claim 3 is characterized in that, the detection range of described power relay is 5.92KW～118.4KW.
5. according to the arbitrary described parallel network power generation anti-backflow device of claim 1～4, it is characterized in that described control circuit is the electric component logic control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201339169U CN201601501U (en) | 2009-07-15 | 2009-07-15 | Photovoltaic grid-connected generation anti-countercurrent device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201339169U CN201601501U (en) | 2009-07-15 | 2009-07-15 | Photovoltaic grid-connected generation anti-countercurrent device |
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| Publication Number | Publication Date |
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| CN201601501U true CN201601501U (en) | 2010-10-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201339169U Expired - Fee Related CN201601501U (en) | 2009-07-15 | 2009-07-15 | Photovoltaic grid-connected generation anti-countercurrent device |
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| CN (1) | CN201601501U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102856894A (en) * | 2012-09-25 | 2013-01-02 | 合肥国润智能电气技术有限公司 | Anti-countercurrent zero-power-consumption regulator |
| CN102882254A (en) * | 2012-09-25 | 2013-01-16 | 合肥国润智能电气技术有限公司 | Zero-loss photovoltaic follower |
| CN103001310A (en) * | 2012-11-23 | 2013-03-27 | 成都科星电器桥架有限公司 | Photovoltaic power generation and urban power grid parallel power supply switching device |
| CN103117534A (en) * | 2011-11-17 | 2013-05-22 | 上海太阳能科技有限公司 | Anti-reflux controller |
| CN103138282A (en) * | 2011-11-24 | 2013-06-05 | 苏州欧姆尼克新能源科技有限公司 | Reverse power protection system of photovoltaic grid-connected inverter |
| CN103166243A (en) * | 2011-12-19 | 2013-06-19 | 阳光电源股份有限公司 | Countercurrent-resisting control method and device and countercurrent-resisting system thereof |
| CN103647283A (en) * | 2013-12-11 | 2014-03-19 | 湖北工业大学 | Solar power grid and municipal power grid no-countercurrent combination power supply control system and method thereof |
| WO2014048278A1 (en) * | 2012-09-27 | 2014-04-03 | 广东易事特电源股份有限公司 | Anti-back-current method and device for grid-connected power generation system |
| CN103887817A (en) * | 2014-03-15 | 2014-06-25 | 杭州国电能源环境设计研究院有限公司 | Countercurrent-preventing controller for households |
-
2009
- 2009-07-15 CN CN2009201339169U patent/CN201601501U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117534A (en) * | 2011-11-17 | 2013-05-22 | 上海太阳能科技有限公司 | Anti-reflux controller |
| CN103138282A (en) * | 2011-11-24 | 2013-06-05 | 苏州欧姆尼克新能源科技有限公司 | Reverse power protection system of photovoltaic grid-connected inverter |
| CN103166243A (en) * | 2011-12-19 | 2013-06-19 | 阳光电源股份有限公司 | Countercurrent-resisting control method and device and countercurrent-resisting system thereof |
| CN102856894A (en) * | 2012-09-25 | 2013-01-02 | 合肥国润智能电气技术有限公司 | Anti-countercurrent zero-power-consumption regulator |
| CN102882254A (en) * | 2012-09-25 | 2013-01-16 | 合肥国润智能电气技术有限公司 | Zero-loss photovoltaic follower |
| WO2014048278A1 (en) * | 2012-09-27 | 2014-04-03 | 广东易事特电源股份有限公司 | Anti-back-current method and device for grid-connected power generation system |
| CN103001310A (en) * | 2012-11-23 | 2013-03-27 | 成都科星电器桥架有限公司 | Photovoltaic power generation and urban power grid parallel power supply switching device |
| CN103001310B (en) * | 2012-11-23 | 2014-09-17 | 成都科星电器桥架有限公司 | Photovoltaic power generation and urban power grid parallel power supply switching device |
| CN103647283A (en) * | 2013-12-11 | 2014-03-19 | 湖北工业大学 | Solar power grid and municipal power grid no-countercurrent combination power supply control system and method thereof |
| CN103887817A (en) * | 2014-03-15 | 2014-06-25 | 杭州国电能源环境设计研究院有限公司 | Countercurrent-preventing controller for households |
| CN103887817B (en) * | 2014-03-15 | 2016-08-17 | 杭州国电能源环境设计研究院有限公司 | Family Anti-reflux controller |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101006 Termination date: 20170715 |
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| CF01 | Termination of patent right due to non-payment of annual fee |