CN108565895A - One kind is for distributed photovoltaic and off-network electricity-generating method - Google Patents
One kind is for distributed photovoltaic and off-network electricity-generating method Download PDFInfo
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- CN108565895A CN108565895A CN201810528892.0A CN201810528892A CN108565895A CN 108565895 A CN108565895 A CN 108565895A CN 201810528892 A CN201810528892 A CN 201810528892A CN 108565895 A CN108565895 A CN 108565895A
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- inverter
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000005611 electricity Effects 0.000 claims abstract description 34
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 238000010248 power generation Methods 0.000 claims abstract description 16
- 238000007689 inspection Methods 0.000 claims 1
- 231100001261 hazardous Toxicity 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Classifications
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- H02J3/383—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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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- Inverter Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention is related to one kind for distributed photovoltaic and off-network electricity-generating method, the electricity-generating method is the anti-isolated island function using photovoltaic DC-to-AC converter, the bearing power detection and voltage detecting function for increasing photovoltaic DC-to-AC converter coordinate with grid-connected case, under different conditions carry out photovoltaic generation and off-network switch, the described method comprises the following steps：1）Photovoltaic has an electricity, and inverter detects that alternating current has electricity, grid connection box to close a floodgate, and inverter startup generates electricity by way of merging two or more grid systems pattern（Current source mode）, while inverter carries out anti-isolated island detection and voltage detecting, 2）When alternating current has a power failure suddenly, the anti-isolated island function of inverter starts, and inverter stops output, while grid connection box disconnects and the contact of alternating current, and 3）Inverter startup off-network power generation mode（Voltage source mode）；Therefore, the present invention has the advantages that judgment method is simple, generating efficiency is high, reliability is high, is not necessarily to other subsidiary conditions.
Description
Technical field
The invention belongs to the technical fields of photovoltaic generation, and in particular to one kind is for distributed photovoltaic and off-network power generation side
Method.
Background technology
Photovoltaic generation is greatly developed as new energy in the whole world, and China also vigorously supports distributed photovoltaic power generation complete
State promotes.Domestic distributed photovoltaic power generation is grid type mostly（Alternating current has electricity, has light just to generate electricity；Alternating current has light can not without electricity
Power generation）, it is not suitable for installation of special occasions, such as hospital, command centre etc. in this way；It is adopted for current distributed photovoltaic is more
Grid type is not suitable for the defect of special occasions, and this programme uses and the different principle of off-network photovoltaic generation, has and judges
Method is simple, generating efficiency is high, reliability is high, without advantages such as other subsidiary conditions, can be widely used in various types of
Distributed photovoltaic power generation equipment；From the point of view of live practical operation situation, the program is fully able to meet the actual demand of engineering,
There is higher application value, the demand particularly suitable for special occasions；Therefore, develop that a kind of judgment method is simple, generating efficiency
High, reliability height, without other subsidiary conditions, for distributed photovoltaic, simultaneously off-network electricity-generating method has a very important significance.
Invention content
The purpose of the invention is to overcome the deficiencies in the prior art, and provide that a kind of judgment method is simple, generating efficiency
High, reliability height is used for distributed photovoltaic and off-network electricity-generating method without other subsidiary conditions.
The object of the present invention is achieved like this：One kind is for distributed photovoltaic and off-network electricity-generating method, the power generation side
Method is the anti-isolated island function using photovoltaic DC-to-AC converter, increases bearing power detection and voltage detecting function and the light of photovoltaic DC-to-AC converter
Lie prostrate grid connection box cooperation, under different conditions carry out photovoltaic generation and off-network switch, the described method comprises the following steps：
1）Photovoltaic has an electricity, and inverter detects that alternating current has electricity, grid connection box to close a floodgate, and inverter startup generates electricity by way of merging two or more grid systems pattern（Current source
Pattern）, while inverter carries out anti-isolated island detection and voltage detecting.
2）When alternating current has a power failure suddenly, the anti-isolated island function of inverter starts, and inverter stops output, at the same grid connection box disconnect with
The contact of alternating current.
3）Inverter startup off-network power generation mode（Voltage source mode）, while inverter carries out bearing power detection and voltage
Detection.
4）When alternating current is sent a telegram here again, inverter stops off-network power generation output, and waiting is incorporated into the power networks, and grid connection box is closed a floodgate, inverse
Change, which is thought highly of, is newly transferred to the pattern of generating electricity by way of merging two or more grid systems.
When the alternating current has electricity, the electricity consumption of grid connection box combined floodgate proof load is carried out at the same time when photovoltaic also has electricity to be incorporated into the power networks
Isolated island detects.
Described when alternating current powers off suddenly, the anti-isolated island of inverter starts, and grid connection box tripping, inverter switchs to off-network fortune at random
Row.
Beneficial effects of the present invention：The present invention is to provide one kind for small distributed and the universal photovoltaic generation of off-network
Equipment, compared with original pure grid type, the program is with judgment method is simple, generating efficiency is high, reliability is high, it is other auxiliary to be not necessarily to
Help the advantages such as condition.The realization of the program will not put forward higher requirements original photovoltaic generation platform, realize threshold compared with
It is low, it is promoted the use of convenient for Code in Hazardous Special Locations；Therefore, the present invention is with judgment method is simple, generating efficiency is high, reliability is high, is not necessarily to
The advantages of other subsidiary conditions.
Description of the drawings
Fig. 1 is a kind of flogic system figure being used for distributed photovoltaic and off-network electricity-generating method of the present invention.
Fig. 2 is of the invention a kind of for inverter hardware connection figure in distributed photovoltaic and off-network electricity-generating method.
Fig. 3 is a kind of system schematic for distributed photovoltaic and off-network electricity-generating method of the present invention.
Specific implementation mode
Following further describes the present invention with reference to the drawings.
Embodiment 1
It is as shown in Figs. 1-3, a kind of that for distributed photovoltaic, simultaneously off-network electricity-generating method, the electricity-generating method are to utilize photovoltaic DC-to-AC converter
Anti- isolated island function, increase bearing power detection and the cooperation of voltage detecting function and grid-connected case of photovoltaic DC-to-AC converter, not
With under conditions of carry out photovoltaic generation and off-network switch, the described method comprises the following steps：
1）Photovoltaic has an electricity, and inverter detects that alternating current has electricity, grid connection box to close a floodgate, and inverter startup generates electricity by way of merging two or more grid systems pattern（Current source
Pattern）, while inverter carries out anti-isolated island detection and voltage detecting.
2）When alternating current has a power failure suddenly, the anti-isolated island function of inverter starts, and inverter stops output, at the same grid connection box disconnect with
The contact of alternating current.
3）Inverter startup off-network power generation mode（Voltage source mode）, while inverter carries out bearing power detection and voltage
Detection.
4）When alternating current is sent a telegram here again, inverter stops off-network power generation output, and waiting is incorporated into the power networks, and grid connection box is closed a floodgate, inverse
Change, which is thought highly of, is newly transferred to the pattern of generating electricity by way of merging two or more grid systems.
The present invention is to provide one kind for small distributed and the universal photovoltaic power generation equipment of off-network, and original pure grid-connected
Type is compared, and the program is with judgment method is simple, generating efficiency is high, reliability is high, is not necessarily to the advantages such as other subsidiary conditions.The party
The realization of case will not put forward higher requirements original photovoltaic generation platform, realize that threshold is relatively low, pushed away convenient for Code in Hazardous Special Locations
It is wide to use；Therefore, the present invention is with judgment method is simple, generating efficiency is high, reliability is high, without the excellent of other subsidiary conditions
Point.
Embodiment 2
For one kind for distributed photovoltaic and off-network electricity-generating method, the electricity-generating method is the anti-isolated island work(using photovoltaic DC-to-AC converter
Can, the bearing power detection and voltage detecting function for increasing photovoltaic DC-to-AC converter coordinate with grid-connected case, under different conditions
Carry out photovoltaic generation and off-network switch, the described method comprises the following steps：
1）Photovoltaic has an electricity, and inverter detects that alternating current has electricity, grid connection box to close a floodgate, and inverter startup generates electricity by way of merging two or more grid systems pattern（Current source
Pattern）, while inverter carries out anti-isolated island detection and voltage detecting.
2）When alternating current has a power failure suddenly, the anti-isolated island function of inverter starts, and inverter stops output, at the same grid connection box disconnect with
The contact of alternating current.
3）Inverter startup off-network power generation mode（Voltage source mode）, while inverter carries out bearing power detection and voltage
Detection.
4）When alternating current is sent a telegram here again, inverter stops off-network power generation output, and waiting is incorporated into the power networks, and grid connection box is closed a floodgate, inverse
Change, which is thought highly of, is newly transferred to the pattern of generating electricity by way of merging two or more grid systems；When the alternating current has electricity, the electricity consumption of grid connection box combined floodgate proof load, when photovoltaic also has electricity
It is incorporated into the power networks, is carried out at the same time isolated island detection；Described when alternating current powers off suddenly, the anti-isolated island of inverter starts, and grid connection box tripping is inverse
Become device and switchs to off-grid operation at random.
The anti-isolated island function of this patent being characterized mainly in that using photovoltaic DC-to-AC converter, increases the load work(of photovoltaic DC-to-AC converter
Rate detects and the cooperation of voltage detecting function and grid-connected case carries out photovoltaic generation and off-network switching.When alternating current has electricity, photovoltaic
Grid-connected inverters are run；Alternating current starts without electricity, the anti-isolated island of inverter, and the grid-connected cities Xiang Yu are electrically disconnected, photovoltaic DC-to-AC converter off-network
Run powering load（It is carried out at the same time bearing power detection）；The voltage detecting function of photovoltaic DC-to-AC converter detects that alternating current comes again
Electricity, photovoltaic DC-to-AC converter disconnect off-grid operation, and grid-connected case closes a floodgate, photovoltaic inverter grid-connected operation；This patent can be carried significantly
High photovoltaic efficiency ensures power supply reliability and safety.
Specific implementation mode is unrestricted to further explanation of the invention, is existed for those of ordinary skills
Further transformation is done to structure in the case of not departing from substantive content of the present invention, and all these transformation should all belong to institute of the present invention
Attached scope of the claims.
Claims (3)
1. one kind is for distributed photovoltaic and off-network electricity-generating method, it is characterised in that：The electricity-generating method is to utilize photovoltaic inversion
The anti-isolated island function of device, the bearing power detection and voltage detecting function for increasing photovoltaic DC-to-AC converter coordinate with grid-connected case,
Under different conditions carry out photovoltaic generation and off-network switch, the described method comprises the following steps：
1）Photovoltaic has an electricity, and inverter detects that alternating current has electricity, grid connection box to close a floodgate, and inverter startup generates electricity by way of merging two or more grid systems pattern（Current source
Pattern）, while inverter carries out anti-isolated island detection and voltage detecting；
2）When alternating current has a power failure suddenly, the anti-isolated island function of inverter starts, and inverter stops output, while grid connection box disconnects and alternating current
Contact；
3）Inverter startup off-network power generation mode（Voltage source mode）, while inverter carries out bearing power detection and voltage inspection
It surveys；
4）When alternating current is sent a telegram here again, inverter stops off-network power generation output, and waiting is incorporated into the power networks, and grid connection box is closed a floodgate, inverter
Again it is transferred to the pattern of generating electricity by way of merging two or more grid systems.
2. one kind according to claim 1 is for distributed photovoltaic and off-network electricity-generating method, it is characterised in that：The alternating current
When having electricity, the electricity consumption of grid connection box combined floodgate proof load is carried out at the same time isolated island detection when photovoltaic also has electricity to be incorporated into the power networks.
3. one kind according to claim 1 is for distributed photovoltaic and off-network electricity-generating method, it is characterised in that：It is described to work as city
When electric power-off suddenly, the anti-isolated island of inverter starts, and grid connection box tripping, inverter switchs to off-grid operation at random.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810528892.0A CN108565895A (en) | 2018-05-29 | 2018-05-29 | One kind is for distributed photovoltaic and off-network electricity-generating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810528892.0A CN108565895A (en) | 2018-05-29 | 2018-05-29 | One kind is for distributed photovoltaic and off-network electricity-generating method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108565895A true CN108565895A (en) | 2018-09-21 |
Family
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|---|---|---|---|
| CN201810528892.0A Pending CN108565895A (en) | 2018-05-29 | 2018-05-29 | One kind is for distributed photovoltaic and off-network electricity-generating method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220085607A1 (en) * | 2020-09-11 | 2022-03-17 | Kabushiki Kaisha Toshiba | Electronic apparatus and method |
| WO2022165701A1 (en) * | 2021-02-04 | 2022-08-11 | 华为数字能源技术有限公司 | Control method and distributed electric power system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7376491B2 (en) * | 2005-10-26 | 2008-05-20 | General Electric Company | Detection of islanding in power grids |
| CN102694393A (en) * | 2012-06-13 | 2012-09-26 | 顺德中山大学太阳能研究院 | Controller for switching grid connection photovoltaic power generation system and off-grid photovoltaic power generation system |
-
2018
- 2018-05-29 CN CN201810528892.0A patent/CN108565895A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7376491B2 (en) * | 2005-10-26 | 2008-05-20 | General Electric Company | Detection of islanding in power grids |
| CN102694393A (en) * | 2012-06-13 | 2012-09-26 | 顺德中山大学太阳能研究院 | Controller for switching grid connection photovoltaic power generation system and off-grid photovoltaic power generation system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220085607A1 (en) * | 2020-09-11 | 2022-03-17 | Kabushiki Kaisha Toshiba | Electronic apparatus and method |
| JP2022047353A (en) * | 2020-09-11 | 2022-03-24 | 株式会社東芝 | Electronic device and method |
| US11616363B2 (en) * | 2020-09-11 | 2023-03-28 | Kabushiki Kaisha Toshiba | Electronic apparatus with detection of an islanding condition |
| JP7402138B2 (en) | 2020-09-11 | 2023-12-20 | 株式会社東芝 | Electronic devices and methods |
| WO2022165701A1 (en) * | 2021-02-04 | 2022-08-11 | 华为数字能源技术有限公司 | Control method and distributed electric power system |
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Application publication date: 20180921 |