CN203707800U - Quick islanding detection device - Google Patents
Quick islanding detection device Download PDFInfo
- Publication number
- CN203707800U CN203707800U CN201420040127.1U CN201420040127U CN203707800U CN 203707800 U CN203707800 U CN 203707800U CN 201420040127 U CN201420040127 U CN 201420040127U CN 203707800 U CN203707800 U CN 203707800U
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- China
- Prior art keywords
- grid
- transformer
- voltage
- inverter group
- isolated island
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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
The utility model relates to a quick islanding detection device, and belongs to the field of a low-voltage power grid. The quick islanding detection device comprises a photovoltaic cell panel (1) and an energy storage battery assembly (2), wherein the photovoltaic cell panel (1) or the energy storage battery assembly (2) are connected with a grid-connection transformer (5) through an inverter group (3), the grid-connection transformer (5) is connected with a power grid (6), a grid-connection static switch (7) is arranged between the grid-connection transformer (5) and the power grid (6), and the inverter group (3) and the grid-connection transformer (5) are provided with load impedance (8) therebetween. The quick islanding detection device can enable inverters to detect the islanding state quickly through acquiring and comparing voltage at an inverter side and a grid side and regarding the voltage as additional signals for controlling the inverter group (3), can ensure the power supply continuity of an important load, and improves the operating efficiency of a micro grid. The quick islanding detection device can detect an islanding phenomenon under the condition that a plurality of parallelly connected inverters operate simultaneously, does not reduce the detection efficiency, has the characteristics of convenient installation, low cost and the like, and can be popularized and applied.
Description
Technical field
The utility model relates to a kind of fast detecting isolated island device, is suitable for the micro-grid system isolated island method for quick of distributed power generation, is mainly used in the low voltage electric network field of low profile photovoltaic, the micro-electric power generating composition of energy storage.
Background technology
Under and background that large mains supply drawback shows especially increasingly serious in energy and environment problem, distributed generation system has the function such as green, environmental protection, can build in around power load, has greatly saved Transmission Cost.Micro-electrical network is that various distributed power sources are combined the low-voltage miniature electrical network of electric energy is provided for locality load, has grid-connected and two kinds of operational modes of isolated island, can improve the power supply reliability of load side.It is one of function of distributed power generation and micro-grid system indispensability that isolated island detects.There is blind zone problem and the phenomenon of destroying the quality of power supply in various degree in current detection method, especially in the time of micro-electrical network institute's energizing quantity and the required energy balance of load, often do not prove effective, may cause following harm: micro-electrical network builtin voltage and frequency generation larger fluctuation when load variations, may damage subscriber equipment; When distributed power source is accessed electrical network again, may make circuit breaker impaired due to combined floodgate asynchronous with electrical network; Even can bring the harm of electric shock to relevant staff.
Utility model content
The purpose of this utility model is to provide a kind of fast detecting isolated island device, the detection micro-grid system island state that this device can fast and reliable.
Technical solution:
To achieve these goals, the utility model adopts technical scheme as follows.
The utility model comprises photovoltaic battery panel, energy-storage battery assembly, photovoltaic battery panel or energy-storage battery assembly are connected with grid-connected transformer by inverter group, grid-connected transformer is connected with electrical network, between grid-connected transformer and electrical network are connected, be provided with grid-connected static switch, between inverter group and grid-connected transformer, be provided with customer charge.
Further: between inverter group and grid-connected transformer, to be provided with inverse switch.
Further: between inverse switch and grid-connected transformer and between grid-connected static switch and electrical network, to be respectively equipped with the first voltage transformer and second voltage instrument transformer, the first voltage transformer, second voltage instrument transformer are connected with voltage comparator by the first rectifier, the second rectifier, the output of voltage comparator is connected with driving amplifier with the given summation of inverter again, and output control signal using final output signal as inverter group.
Further: customer charge adopts typical impedance, and typical impedance comprises: R, L, C.
Further: photovoltaic battery panel is connected with inverter group respectively with energy-storage battery assembly.
Further: photovoltaic battery panel adopts polysilicon, energy-storage battery assembly adopts ferric phosphate lithium cell.
The utility model advantage:
1) grid-connected static switch is set in circuit, can accurately judges micro-electrical network island state, can guarantee the power supply continuity of important load, improve micro-operation of power networks efficiency, be suitable for business promotion application.
2) the first voltage transformer second voltage instrument transformer is set in circuit, can compare inverter side and voltage on line side amplitude, and control additional signal using the potential difference of its instrument transformer secondary side as inverter, thereby make micro-electrical network fast and reliable detect isolated island, the simultaneously same practicality of isolated island detection in the least favorable situation when loading power demand balance for power that micro-electrical network supply, reach the object that detects non-blind area, made up the deficiency that traditional isolated island detects.
3) inverter group can judge isolated island generation by detecting its output port voltage jump phenomenon, does not need to increase additional circuit or protection relay independently from hardware, does not also affect the output quality of power supply.
4) can in the case of many inverter groups in parallel are moved, detect isolated island simultaneously, can not reduce detection efficiency.
5) differentiate accurate, easy for installationly, with low cost, there is application value.
Accompanying drawing explanation
Fig. 1 is fast detecting isolated island apparatus structure schematic diagram.
Fig. 2 is fast detecting isolated island device circuit schematic diagram.
Specific implementation method
1,2 pair of utility model is described in further detail by reference to the accompanying drawings.
The utility model photovoltaic battery panel 1 is connected with inverter group 3 respectively with energy-storage battery assembly 2, and inverter group 3 is connected with grid-connected transformer 5, between inverter group 3 and grid-connected transformer 5, is provided with inverse switch 4; Grid-connected transformer 5 is connected with electrical network 6, between grid-connected transformer 5 and electrical network 6 are connected, is provided with grid-connected static switch 7, between inverter group 3 and grid-connected transformer 5, is provided with customer charge 8.
Between described inverse switch 4 and grid-connected transformer 5 and between grid-connected static switch 7 and electrical network 6, be respectively equipped with the first voltage transformer 9 and the second instrument transformer 10, the first voltage transformer 9, the second instrument transformer 10 are connected with voltage comparator 13 by the first rectifier 11, the second rectifier 12, the output of voltage comparator 13 is connected with driving amplifier 14 with the given summation of inverter again, and output control signal using final output signal as inverter group 3.
Described customer charge adopts typical impedance, and typical impedance comprises: R, L, C.
Described photovoltaic battery panel 1 adopts polysilicon, and energy-storage battery assembly 2 adopts ferric phosphate lithium cell.
When micro-electrical network is incorporated into the power networks, inverter group 3 port output voltage amplitudes are pind down by line voltage, thereby can not undergo mutation, and namely electrical network 6 fault-free or grid-connected static switch 7 are not opened.On the contrary, when electrical network 6 faults or grid-connected static switch 7 are opened, generally inverter group 3 output voltages can be undergone mutation, but under special circumstances, for example, when load power and inverter power balance, now inverter group 3 voltages can not be undergone mutation, and this will produce the blind area that traditional detection method cannot detect.For fear of the generation of this small probability event, this device will increase the additional control signal of inverter group 3.In the time of electric network fault, can impel the 3 output voltage sudden changes of inverter group, thereby accelerate isolated island detection speed, improve the reliability of judgement.Principle is for gather inverter side and voltage on line side information simultaneously, and ask poor after as the voltage-controlled added value of inverter group 3.When system is incorporated into the power networks, both differences are zero; On the contrary, in the time that electric network fault or grid-connected static switch 7 are opened, because additional set-point increases, thereby make inverter group 3 output port voltage jumps very fast, also improved the reliability detecting.Inverter group 3 controlling values have two parts to form, and a part is for system is given, another part is the poor value signal of inverter group 3 port voltages and voltage on line side.
In order to reach the reliability of detection, adopt the various combination of R, L, C element in parallel to carry out analytical test as customer charge 8, confirm this device reliability of operation.
Claims (6)
1. a fast detecting isolated island device, comprise photovoltaic battery panel (1), energy-storage battery assembly (2), it is characterized in that, photovoltaic battery panel (1) or energy-storage battery assembly (2) are connected with grid-connected transformer (5) by inverter group (3), grid-connected transformer (5) is connected with electrical network (6), between grid-connected transformer (5) and electrical network (6) are connected, be provided with grid-connected static switch (7), between inverter group (3) and grid-connected transformer (5), be provided with customer charge (8).
2. a kind of fast detecting isolated island device according to claim 1, is characterized in that, between inverter group (3) and grid-connected transformer (5), is provided with inverse switch (4).
3. a kind of fast detecting isolated island device according to claim 1, it is characterized in that, between inverse switch (4) and grid-connected transformer (5) and between grid-connected static switch (7) and electrical network (6), be respectively equipped with the first voltage transformer (9) and second voltage instrument transformer (10), the first voltage transformer (9), second voltage instrument transformer (10) is by the first rectifier (11), the second rectifier device (12) is connected with voltage comparator (13), the output of voltage comparator (13) is connected with driving amplifier (14) with the given summation of inverter again, and output control signal using final output signal as inverter group (3).
4. a kind of fast detecting isolated island device according to claim 1, is characterized in that, load impedance adopts typical impedance, and typical impedance comprises: R, L, C.
5. a kind of fast detecting isolated island device according to claim 1, is characterized in that, photovoltaic battery panel (1) can be connected with inverter group (3) respectively with energy-storage battery assembly (2).
6. a kind of fast detecting isolated island device according to claim 1, is characterized in that, photovoltaic battery panel (1) adopts polysilicon, and energy-storage battery assembly (2) adopts ferric phosphate lithium cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420040127.1U CN203707800U (en) | 2014-01-22 | 2014-01-22 | Quick islanding detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420040127.1U CN203707800U (en) | 2014-01-22 | 2014-01-22 | Quick islanding detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203707800U true CN203707800U (en) | 2014-07-09 |
Family
ID=51058182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420040127.1U Expired - Fee Related CN203707800U (en) | 2014-01-22 | 2014-01-22 | Quick islanding detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203707800U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106918754A (en) * | 2017-03-23 | 2017-07-04 | 华北电力大学 | A kind of direct-current micro-grid island detection method based on additional impedance |
| CN108802567A (en) * | 2018-06-01 | 2018-11-13 | 国网浙江省电力有限公司宁波供电公司 | Isolated island monitoring method for new energy |
-
2014
- 2014-01-22 CN CN201420040127.1U patent/CN203707800U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106918754A (en) * | 2017-03-23 | 2017-07-04 | 华北电力大学 | A kind of direct-current micro-grid island detection method based on additional impedance |
| CN108802567A (en) * | 2018-06-01 | 2018-11-13 | 国网浙江省电力有限公司宁波供电公司 | Isolated island monitoring method for new energy |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20170122 |