CN202444279U - Countercurrent prevention system - Google Patents
Countercurrent prevention system Download PDFInfo
- Publication number
- CN202444279U CN202444279U CN2012200591968U CN201220059196U CN202444279U CN 202444279 U CN202444279 U CN 202444279U CN 2012200591968 U CN2012200591968 U CN 2012200591968U CN 201220059196 U CN201220059196 U CN 201220059196U CN 202444279 U CN202444279 U CN 202444279U
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- power
- control apparatus
- detection control
- 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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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model discloses a countercurrent prevention system which comprises an alternating-current power distribution cabinet with the function of countercurrent prevention, a grid-connected inverter and a detection controlling device. The detection controlling device comprises an input power detection controller and a reverse-power detection controller and further comprises a current transformer which is clamped on an output line of the current transformer in a high voltage incoming measurement system in a sleeved mode. The current transformer is connected with the input power detection controller and the reverse-power detection controller of the detection controlling device. Sampling voltage signals of the input power detection controller and the reverse-power detection controller of the detection controlling device are directly achieved from the secondary of the step-down transformer of a user. The detection controlling device performs infinitely variable control on the output power of the grid-connected inverter according to load changes. Once the grid-connected inverter can not adjust the power downwards and is under a countercurrent state or the countercurrent prevention system works abnormally, the detection controlling device outputs signals to the alternating-current power distribution cabinet with the function of countercurrent prevention, cuts the output of the grid-connected inverter and guarantees that no countercurrent occurs.
Description
Affiliated technical field
The utility model belongs to the technical field of generating electricity by way of merging two or more grid systems, and more particularly, relates to a kind of anti-contracurrent system of parallel network power generation.
Background technology
A kind of anti-contracurrent system of existing parallel network power generation, this anti-contracurrent system mainly are made up of AC power distribution cabinet/AC distribution panel, combining inverter and the detection control apparatus of the anti-adverse current function of band.Combining inverter is transformed into alternating current with the direct current that produces in the photovoltaic generating system, and is incorporated into the power networks be incorporated into the power networks step-up transformer and public electric wire net through the AC power distribution cabinet/AC distribution panel of the anti-adverse current function of band.The input power that contains detection control apparatus detects controller, inverse probability detection controller.Detection control apparatus links to each other with combining inverter with the AC power distribution cabinet/AC distribution panel of the anti-adverse current function of band.The sample rate current signal of detection control apparatus is that 0-5A, sampled voltage signal are AC100V; Common engineering utilizes usually when installing that the current transformer in the high pressure inlet wire metering system is connected with it, voltage transformer parallel connection with it; But like this may with the mutual interference mutually of anti-contracurrent system, the stability of influence metering and anti-contracurrent system and must having a power failure when installing.
The utility model content
The technical problem that the utility model will solve provides a kind of anti-contracurrent system, and this anti-contracurrent system can be isolated with high pressure inlet wire metering system, thereby has ensured the stability of anti-contracurrent system, and easy for installation.
For solving the problems of the technologies described above; A kind of anti-contracurrent system of the utility model; The AC power distribution cabinet/AC distribution panel, combining inverter and the detection control apparatus that contain the anti-adverse current function of band; Combining inverter is transformed into alternating current with the direct current that produces in the photovoltaic generating system, and is incorporated into the power networks be incorporated into the power networks step-up transformer and public electric wire net through the AC power distribution cabinet/AC distribution panel of the anti-adverse current function of band, and detection control apparatus contains input power detection controller, inverse probability detects controller; Detection control apparatus links to each other with combining inverter with the AC power distribution cabinet/AC distribution panel of the anti-adverse current function of band; Also contain current transformer, on the outlet line of the current transformer of this current transformer chuck in high pressure inlet wire metering system, this current transformer detects controller with the input power of said detection control apparatus and inverse probability detection controller links to each other; The sampled voltage signal that the input power of said detection control apparatus detects controller and inverse probability detection controller directly obtains from the secondary of user's step-down transformer; Said detection control apparatus converts the on high-tension side voltage signal of public electric wire net to through calculating, and said detection control apparatus guarantees that according to the power output of the said combining inverter of load variations step-less adjustment electrical network is in power supply state;, said combining inverter is in adverse current state or anti-contracurrent system work in case can not regulating power downwards when undesired; Said detection control apparatus outputs signal to the AC power distribution cabinet/AC distribution panel of the anti-adverse current function of said band, cuts off the output of combining inverter, guarantees not have adverse current to take place.
In the above-mentioned anti-contracurrent system; Because on the outlet line of the current transformer of current transformer chuck in high pressure inlet wire metering system that links to each other with the input power detection controller and the inverse probability detection controller of detection control apparatus; And its sampled voltage signal directly obtains from the secondary of user's step-down transformer; Therefore should prevent that contracurrent system was complete and high pressure inlet wire metering system is isolated, thereby ensure the stability of anti-contracurrent system; Because said detection control apparatus is according to the power output of the said combining inverter of load variations step-less adjustment; And can not regulate power downwards when said combining inverter and be in the adverse current state or anti-contracurrent system work when undesired; Said detection control apparatus outputs signal to the AC power distribution cabinet/AC distribution panel of the anti-adverse current function of said band; Cut off the output of combining inverter, guarantee not have adverse current to take place, therefore further ensured the stability of anti-contracurrent system; Because on the outlet line of the current transformer of sample rate current instrument transformer chuck in high pressure inlet wire metering system, the sampled voltage signal directly obtains from the secondary of user's step-down transformer, need not when therefore installing to have a power failure, install simple, convenient.
Description of drawings
Fig. 1 be the utility model electrical schematic diagram.
1. combining inverters among the figure, 2. band is prevented the AC power distribution cabinet/AC distribution panel of adverse current function, step-up transformer 3. is incorporated into the power networks; 4. public electric wire net, 5. user load, 6. user's step-down transformer; 7. detection control apparatus; 8. the current transformer in the high pressure inlet wire metering system, 9. current transformer, 10. high pressure inlet wire metering system.
Embodiment
Among Fig. 1, a kind of anti-contracurrent system contains AC power distribution cabinet/AC distribution panel 2, combining inverter 1 and detection control apparatus 7 that band is prevented the adverse current function.Combining inverter 1 is transformed into alternating current with the direct current that produces in the photovoltaic generating system, and is incorporated into the power networks with public electric wire net 4 with the step-up transformer 3 that is incorporated into the power networks through the AC power distribution cabinet/AC distribution panel 2 of the anti-adverse current function of band.The input power that contains detection control apparatus 7 detects controller, inverse probability detection controller.Detection control apparatus 7 links to each other with combining inverter 1 with the AC power distribution cabinet/AC distribution panel 2 of the anti-adverse current function of band.Said anti-contracurrent system also contains current transformer 9; On the outlet line of the current transformer 8 of these current transformer 9 chucks in high pressure inlet wire metering system 10; This current transformer 9 detects controller with the input power of said detection control apparatus 7 and inverse probability detection controller links to each other; The sampled voltage signal that the input power of said detection control apparatus detects controller and inverse probability detection controller directly obtains from the secondary of user's step-down transformer 6, and user's step-down transformer 6 links to each other with user load 5.Said detection control apparatus 7 converts public electric wire net 4 on high-tension side voltage signals to through calculating.Said detection control apparatus 7 changes the power output of the said combining inverter 1 of step-less adjustment according to user load 5; Guarantee that electrical network is in power supply state;, said combining inverter 1 is in adverse current state or anti-contracurrent system work in case can not regulating power downwards when undesired; Said detection control apparatus 7 outputs signal to the AC power distribution cabinet/AC distribution panel 2 of the anti-adverse current function of said band, cuts off the output of combining inverter 1, guarantees not have adverse current to take place.In the above-mentioned anti-contracurrent system; Because on the outlet line of the current transformer 8 of current transformer 9 chucks in high pressure inlet wire metering system 10 that links to each other with the input power detection controller and the inverse probability detection controller of detection control apparatus 7; And its sampled voltage signal directly obtains from the secondary of user's step-down transformer 6; Therefore should prevent that contracurrent system was complete and high pressure inlet wire metering system 10 is isolated, thereby ensure the stability of anti-contracurrent system.Because said detection control apparatus 7 changes the power output of the said combining inverter 1 of step-less adjustment according to user load 5; And can not regulate power downwards when said combining inverter 1 and be in the adverse current state or anti-contracurrent system work when undesired; Said detection control apparatus 7 outputs signal to the AC power distribution cabinet/AC distribution panel 2 of the anti-adverse current function of said band; Cut off the output of combining inverter 1, guarantee not have adverse current to take place, therefore further ensured the stability of anti-contracurrent system; Because on the outlet line of the current transformer 8 of current transformer 9 chucks in high pressure inlet wire metering system 10, and the sampled voltage signal directly obtains from the secondary of user's step-down transformer 6, need not when therefore installing to have a power failure, and is simple, convenient.
Claims (1)
1. anti-contracurrent system; The AC power distribution cabinet/AC distribution panel, combining inverter and the detection control apparatus that contain the anti-adverse current function of band; Combining inverter is transformed into alternating current with the direct current that produces in the photovoltaic generating system; And through being with the AC power distribution cabinet/AC distribution panel of preventing the adverse current function and be incorporated into the power networks step-up transformer and public electric wire net to be incorporated into the power networks; The input power that contains detection control apparatus detects controller, inverse probability detection controller, and detection control apparatus links to each other with combining inverter with the AC power distribution cabinet/AC distribution panel of the anti-adverse current function of band, it is characterized in that: also contain current transformer; On the outlet line of the current transformer of this current transformer chuck in high pressure inlet wire metering system; This current transformer detects controller with the input power of said detection control apparatus and inverse probability detection controller links to each other, and the sampled voltage signal that the input power of said detection control apparatus detects controller and inverse probability detection controller directly obtains from the secondary of user's step-down transformer, and said detection control apparatus converts the on high-tension side voltage signal of public electric wire net to through calculating; Said detection control apparatus is according to the power output of the said combining inverter of load variations step-less adjustment; Guarantee that electrical network is in power supply state, be in adverse current state or anti-contracurrent system work in case said combining inverter can not be regulated power downwards when undesired, said detection control apparatus outputs signal to the AC power distribution cabinet/AC distribution panel of the anti-adverse current function of said band; Cut off the output of combining inverter, guarantee not have adverse current to take place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200591968U CN202444279U (en) | 2012-02-23 | 2012-02-23 | Countercurrent prevention system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200591968U CN202444279U (en) | 2012-02-23 | 2012-02-23 | Countercurrent prevention system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202444279U true CN202444279U (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200591968U Expired - Lifetime CN202444279U (en) | 2012-02-23 | 2012-02-23 | Countercurrent prevention system |
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| Country | Link |
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| CN (1) | CN202444279U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368203A (en) * | 2013-06-26 | 2013-10-23 | 国家电网公司 | Photovoltaic reverse-power closed loop control system and method |
| 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 |
| CN104917458A (en) * | 2015-05-22 | 2015-09-16 | 江苏固德威电源科技有限公司 | Method and circuit for detecting output current in absence of sensor |
| CN106953587A (en) * | 2017-04-28 | 2017-07-14 | 中联西北工程设计研究院有限公司 | A kind of building external solar energy photovoltaic panel shading system |
| CN107069798A (en) * | 2017-01-17 | 2017-08-18 | 陕西科技大学 | The control method and its system of distributed photovoltaic power generation system |
| CN108233404A (en) * | 2016-12-21 | 2018-06-29 | 南京工程学院 | Actively anti-reverse flow pattern single-phase grid-connected inverter |
-
2012
- 2012-02-23 CN CN2012200591968U patent/CN202444279U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368203A (en) * | 2013-06-26 | 2013-10-23 | 国家电网公司 | Photovoltaic reverse-power closed loop control system and method |
| CN103368203B (en) * | 2013-06-26 | 2015-11-04 | 国家电网公司 | Photovoltaic reverse power closed-loop control system and method |
| 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 |
| CN104917458A (en) * | 2015-05-22 | 2015-09-16 | 江苏固德威电源科技有限公司 | Method and circuit for detecting output current in absence of sensor |
| CN104917458B (en) * | 2015-05-22 | 2017-12-15 | 江苏固德威电源科技股份有限公司 | A kind of method and its circuit of sensorless detection output current |
| CN108233404A (en) * | 2016-12-21 | 2018-06-29 | 南京工程学院 | Actively anti-reverse flow pattern single-phase grid-connected inverter |
| CN107069798A (en) * | 2017-01-17 | 2017-08-18 | 陕西科技大学 | The control method and its system of distributed photovoltaic power generation system |
| CN106953587A (en) * | 2017-04-28 | 2017-07-14 | 中联西北工程设计研究院有限公司 | A kind of building external solar energy photovoltaic panel shading system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120919 |
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| CX01 | Expiry of patent term |