CN103138282A - Reverse power protection system of photovoltaic grid-connected inverter - Google Patents
Reverse power protection system of photovoltaic grid-connected inverter Download PDFInfo
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- CN103138282A CN103138282A CN2011103778923A CN201110377892A CN103138282A CN 103138282 A CN103138282 A CN 103138282A CN 2011103778923 A CN2011103778923 A CN 2011103778923A CN 201110377892 A CN201110377892 A CN 201110377892A CN 103138282 A CN103138282 A CN 103138282A
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- photovoltaic combining
- combining inverter
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- protection system
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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
A reverse power protection system of a photovoltaic grid-connected inverter relates to the technical field of solar power generation and is composed of a solar panel (1), the photovoltaic grid-connected inverter (2), a power grid (3), a current sensor (4) and a load (5). The solar panel (1) is connected with the photovoltaic grid-connected inverter (2), the photovoltaic grid-connected inverter (2) is connected with the current sensor (4), and the current sensor (4) is respectively connected with the power grid (3) and the load (5). The reverse power protection system of the photovoltaic grid-connected inverter is simple in structure, convenient to install, low in cost, applicable to two working modes, namely direct grid connection and reverse power protection, and being capable of outputting corresponding power according to the size of the load.
Description
Technical field:
The present invention relates to the solar energy generation technology field, relate in particular to the reverse power protection system of photovoltaic combining inverter.
Background technology:
At present, in worldwide, new forms of energy have obtained development fast, what wherein the solar power generation in regenerative resource also developed is very fast, a lot of countries have promulgated subsidy policy, encourage the common people to generate electricity with new forms of energy such as solar energy, but because present photovoltaic combining inverter technology is not also very ripe, when being connected to the grid certain capacity, can produce disturb and harmonic pollution electrical network, therefore many countries temporarily also do not ratify solar inverter and can be connected to the grid in the world.
when the inverse probability that is incorporated into the power networks refers to dump power that solar inverter produces, this electric energy is sent into utility grid, owing to being and the mains-supplied opposite direction, so become inverse probability, when power shortage that photovoltaic combining inverter produces, powered by civil power, at present, the power department of a lot of countries is worried can cause unstable and produce harmonic pollution utility grid after photovoltaic combining inverter is incorporated civil power into, the electric weight that the while photovoltaic combining inverter produces is non-scheduling, therefore, can photovoltaic combining inverter incorporate utility grid into and became one of major issue of some areas restrictions solar energy development present stage.
present photovoltaic combining inverter will be realized the reverse power protection function, the control system that is all generally an external more complicated realizes, this control system comprises controller, the collector of load and line voltage electric current, the equipment such as control relay of inverter input/output terminal consist of, collect the voltage and current signal of load and electrical network when controller, through certain control algolithm, whether calculate inverter will generate electricity, then control the switch of relevant relay, prevent that to reach inverter is to the purpose of electrical network transmission power, existing technology has increased an extra equipment, greatly increased the cost of system, the equipment wiring that increases and control all more complicated, increased the unreliability of system.
Summary of the invention:
The purpose of this invention is to provide the reverse power protection system of photovoltaic combining inverter, it is simple in structure, and is easy for installation, and cost is lower, can according to the corresponding watt level of size output of load, be applicable to two kinds of mode of operations of direct grid-connected and reverse power protection.
In order to solve the existing problem of background technology, the present invention is by the following technical solutions: it is comprised of solar panel 1, photovoltaic combining inverter 2, electrical network 3, current sensor 4, load 5; Solar panel 1 is connected with photovoltaic combining inverter 2, and photovoltaic combining inverter 2 interconnects with current sensor 4, and current sensor 4 is connected with load with electrical network 3 respectively and is connected.
The size of the electric current in the load 5 that in system of the present invention, photovoltaic combining inverter 2 can sample according to current sensor 4 decides the size of the power output of photovoltaic combining inverter 2, when the demand of load 5 surpasses the peak power output of inverter, line voltage can begin input power, and the power difference that is lacked part is provided.
workflow of the present invention is: the current conversion that samples in load 5 by current sensor 4 becomes the signal of 4-20mA to send photovoltaic combining inverter 2 to, 2 li of photovoltaic combining inverters are sent the signal that the signal of 4-20mA is transformed into 0-3V in dsp processor to by a sample circuit, DSP is by calculating present load 5 current Ib, then the current value I a that obtains according to output current transducer 4 samplings of photovoltaic combining inverter 2 itself, by comparing the size of two current values, feed back to photovoltaic combining inverter 2 and control the watt level of himself exporting, when photovoltaic combining inverter 2 output currents during greater than load 5 required electric current, reduce the power output of photovoltaic combining inverter 2, when photovoltaic combining inverter 2 output currents during less than load 5 required electric current, increase the power output of photovoltaic combining inverter 2, at this moment, when if the required power of load 5 surpasses the peak power output of photovoltaic DC-to-AC converter 2, photovoltaic combining inverter 2 operates in maximum power, remaining part is replenished automatically by electrical network, if photovoltaic parallel in system can directly generate electricity by way of merging two or more grid systems, as long as that cancel external current sensor 4, photovoltaic combining inverter 2 meetings are generated electricity by way of merging two or more grid systems to electrical network according to the watt level of the reality of solar panel 1.
The photovoltaic combining inverter 2 that the present invention adopts integrated counter power to control realizes by the electric current of external impressed current transducer 4 sampling loads 5 function that inverse probability is controlled.
The present invention is simple in structure, and is easy for installation, and cost is lower, can according to the corresponding watt level of size output of load, be applicable to two kinds of mode of operations of direct grid-connected and reverse power protection.
Description of drawings:
Fig. 1 is structural representation of the present invention;
Fig. 2 is workflow schematic diagram of the present invention.
Embodiment:
With reference to Fig. 1, Fig. 2, this embodiment by the following technical solutions: it is comprised of solar panel 1, photovoltaic combining inverter 2, electrical network 3, current sensor 4, load 5; Solar panel 1 is connected with photovoltaic combining inverter 2, and photovoltaic combining inverter 2 interconnects with current sensor 4, and current sensor 4 is connected with load with electrical network 3 respectively and is connected.
The size of the electric current in the load 5 that in this embodiment system, photovoltaic combining inverter 2 can sample according to current sensor 4 decides the size of the power output of photovoltaic combining inverter 2, when the demand of load 5 surpasses the peak power output of inverter, line voltage can begin input power, and the power difference that is lacked part is provided.
the workflow of this embodiment is: the current conversion that samples in load 5 by current sensor 4 becomes the signal of 4-20mA to send photovoltaic combining inverter 2 to, 2 li of photovoltaic combining inverters are sent the signal that the signal of 4-20mA is transformed into 0-3V in dsp processor to by a sample circuit, DSP is by calculating present load 5 current Ib, then the current value I a that obtains according to output current transducer 4 samplings of photovoltaic combining inverter 2 itself, by comparing the size of two current values, feed back to photovoltaic combining inverter 2 and control the watt level of himself exporting, when photovoltaic combining inverter 2 output currents during greater than load 5 required electric current, reduce the power output of photovoltaic combining inverter 2, when photovoltaic combining inverter 2 output currents during less than load 5 required electric current, increase the power output of photovoltaic combining inverter 2, at this moment, when if the required power of load 5 surpasses the peak power output of photovoltaic DC-to-AC converter 2, photovoltaic combining inverter 2 operates in maximum power, remaining part is replenished automatically by electrical network, if photovoltaic parallel in system can directly generate electricity by way of merging two or more grid systems, as long as that cancel external current sensor 4, photovoltaic combining inverter 2 meetings are generated electricity by way of merging two or more grid systems to electrical network according to the watt level of the reality of solar panel 1.
The photovoltaic combining inverter 2 that this embodiment adopts integrated counter power to control realizes by the electric current of external impressed current transducer 4 sampling loads 5 function that inverse probability is controlled.
This embodiment is simple in structure, and is easy for installation, and cost is lower, can according to the corresponding watt level of size output of load, be applicable to two kinds of mode of operations of direct grid-connected and reverse power protection.
Claims (3)
1. the reverse power protection system of photovoltaic combining inverter, is characterized in that it is comprised of solar panel (1), photovoltaic combining inverter (2), electrical network (3), current sensor (4), load (5); Solar panel (1) is connected with photovoltaic combining inverter (2), and photovoltaic combining inverter (2) interconnects with current sensor (4), and current sensor (4) is connected 5 with electrical network (3) with load respectively) be connected.
2. the reverse power protection system of photovoltaic combining inverter according to claim 1; the size that it is characterized in that the electric current in load (5) that photovoltaic combining inverter in described system (2) can sample according to current sensor (4) decides the size of the power output of photovoltaic combining inverter (2); when the demand of load (5) surpasses the peak power output of inverter; line voltage can begin input power, and the power difference that is lacked part is provided.
3. the reverse power protection system of photovoltaic combining inverter according to claim 1; it is characterized in that the photovoltaic combining inverter (2) that described protection system adopts integrated counter power to control, realize by the electric current of external impressed current transducer (4) sampling load (5) function that inverse probability is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011103778923A CN103138282A (en) | 2011-11-24 | 2011-11-24 | Reverse power protection system of photovoltaic grid-connected inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103778923A CN103138282A (en) | 2011-11-24 | 2011-11-24 | Reverse power protection system of photovoltaic grid-connected inverter |
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| CN103138282A true CN103138282A (en) | 2013-06-05 |
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| CN2011103778923A Pending CN103138282A (en) | 2011-11-24 | 2011-11-24 | Reverse power protection system of photovoltaic grid-connected inverter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780221A (en) * | 2012-07-20 | 2012-11-14 | 上海交通大学 | System and method for controlling online type photovoltaic power generation microgrid without storage device |
| CN103346587A (en) * | 2013-07-09 | 2013-10-09 | 京东方科技集团股份有限公司 | Anti-countercurrent grid-connected photovoltaic power generation system |
| CN103441526A (en) * | 2013-08-14 | 2013-12-11 | 华北电力大学（保定） | Grid-connected off-grid small photovoltaic power generation system and control method |
| CN110970929A (en) * | 2019-12-19 | 2020-04-07 | 无锡科能达自动化科技有限公司 | Spontaneous self-use type distributed photovoltaic power station reverse power control module, method and system |
| CN114144952A (en) * | 2019-07-25 | 2022-03-04 | 智能追踪识别有限公司 | Circuit for supplying power to centrifugal pump |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201601501U (en) * | 2009-07-15 | 2010-10-06 | 深圳市能联电子有限公司 | Photovoltaic grid-connected generation anti-countercurrent device |
| 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 |
| CN102097817A (en) * | 2010-01-06 | 2011-06-15 | 珠海兴业新能源科技有限公司 | Photovoltaic reverse power controller |
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2011
- 2011-11-24 CN CN2011103778923A patent/CN103138282A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201601501U (en) * | 2009-07-15 | 2010-10-06 | 深圳市能联电子有限公司 | Photovoltaic grid-connected generation anti-countercurrent device |
| CN102097817A (en) * | 2010-01-06 | 2011-06-15 | 珠海兴业新能源科技有限公司 | Photovoltaic reverse power controller |
| 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 |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780221A (en) * | 2012-07-20 | 2012-11-14 | 上海交通大学 | System and method for controlling online type photovoltaic power generation microgrid without storage device |
| CN102780221B (en) * | 2012-07-20 | 2014-08-27 | 上海交通大学 | System and method for controlling online type photovoltaic power generation microgrid without storage device |
| CN103346587A (en) * | 2013-07-09 | 2013-10-09 | 京东方科技集团股份有限公司 | Anti-countercurrent grid-connected photovoltaic power generation system |
| CN103346587B (en) * | 2013-07-09 | 2015-06-03 | 京东方科技集团股份有限公司 | Anti-countercurrent grid-connected photovoltaic power generation system |
| CN103441526A (en) * | 2013-08-14 | 2013-12-11 | 华北电力大学（保定） | Grid-connected off-grid small photovoltaic power generation system and control method |
| CN103441526B (en) * | 2013-08-14 | 2015-04-01 | 华北电力大学（保定） | Grid-connected off-grid small photovoltaic power generation system and control method |
| CN114144952A (en) * | 2019-07-25 | 2022-03-04 | 智能追踪识别有限公司 | Circuit for supplying power to centrifugal pump |
| CN110970929A (en) * | 2019-12-19 | 2020-04-07 | 无锡科能达自动化科技有限公司 | Spontaneous self-use type distributed photovoltaic power station reverse power control module, method and system |
| CN110970929B (en) * | 2019-12-19 | 2021-04-20 | 无锡科能达自动化科技有限公司 | Spontaneous self-use type distributed photovoltaic power station reverse power control module, method and system |
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Application publication date: 20130605 |