CN102723737B - Control method based on micro-grid multi-energy - Google Patents
Control method based on micro-grid multi-energy Download PDFInfo
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- CN102723737B CN102723737B CN201210229361.4A CN201210229361A CN102723737B CN 102723737 B CN102723737 B CN 102723737B CN 201210229361 A CN201210229361 A CN 201210229361A CN 102723737 B CN102723737 B CN 102723737B
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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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- 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
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
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Abstract
The invention relates to a control method based on micro-grid multi-energy, which is mainly used for grid control of micro-grid isolated network starting, off network operation transferring to grid connection operation and grid connection operation transferring to off network operation; when the micro-grid is started or switched, a power supply is set as a reference power supply; in the processes of micro-grid isolated network starting, off network operation transferring to grid connection operation and grid connection operation transferring to off network operation isolated network, the set reference power supply is respectively used as the reference to perform starting or switching step. The control method provided by the invention solves the selection problem of system frequency in a micro-grid system under the condition that various power supplies exist, thus, the frequency of the micro-grid system is kept stable, and the stability of the frequency of the micro-grid system can be ensured when sub-micro-grids are connected. The method provided by the invention can be used for ensuring stable operation of the micro-grid system when the micro-grid is started or switched, and the adjustment of nonlinear load and circuits by harmonic wave caused can be favored.
Description
Technical field
The present invention relates to a kind of control method of micro-electrical network multiple-energy-source, specifically relate to a kind of single master control method that is mainly used in many power supplys in micro-electrical network distributed energy, belong to micro-electric power network technique field.
Background technology
In distributed energy micro-grid system, generally have the various ways power supplys such as wind-force, photovoltaic, waterpower, natural gas, diesel engine generator.In tradition electrical network, system frequency is generally taking Power Plant Side frequency as benchmark.Decline in electrical network in distribution, have many places Generation Side, the control method of traditional electrical network is not suitable for micro-electrical network.
In order to ensure the stable operation of micro-grid system, it is particularly important that the control strategy of power supply seems.The various control methods of current micro-electric network source have master-slave control strategy, reciprocity control strategy.Master-slave control strategy is very large to main power source and communication dependence, once main power source or communication apparatus break down, will the operation of system be caused to very large impact; Equity control strategy without communication, plug and play; But steady-state error can not reach 0, and can not correctly regulate the harmonic wave that nonlinear load and circuit cause to distribute.
Summary of the invention
For solving the deficiencies in the prior art, the present invention proposes a kind of control method of micro-electrical network multiple-energy-source, ensure the stable operation of distributed power source in micro-electrical network.
For reaching above object, the present invention adopts following technical scheme to realize:
A kind of control method based on micro-electrical network multiple-energy-source, it is characterized in that, in the time starting or switch, all to set a power supply be reference power supply to microgrid, and the lonely net of microgrid starts, turn grid-connected, grid-connected from net leaves in network process, carries out the step that starts or switch respectively taking the reference power supply set as benchmark.
Comprise following steps:
The setting up procedure of microgrid under lonely net state: under lonely net state, first micro-grid system starts diesel engine generator, in the time that diesel engine generator normally moves, taking diesel engine generator as main power source, photovoltaic generator and/or wind-driven generator generate electricity by way of merging two or more grid systems taking diesel engine generator as reference power supply; After this, load equipment normally starts;
Grid-connected step from microgrid under net starting state: after the lonely net of microgrid starts, micro-grid system belongs to from network operation, now if desired be incorporated into the power networks, taking the electric power incoming line on netting twine road, city as reference power supply, each microgrid generating equipment be adjusted into after consistent with civil power and carry out grid-connected operation;
Under grid-connected starting state microgrid from net step: after microgrid starts and is incorporated into the power networks, micro-grid system belongs to and is incorporated into the power networks, now if desired from network operation, by PCC static switch Switching power, energy storage device starts afterwards, according to field condition taking diesel engine generator or energy storage device if ultracapacitor is as reference power supply, drive the whole network operation, last each generating equipment adjustment state is taken over described energy storage device work.
Described energy storage device comprises ultracapacitor, lithium battery or lead-acid battery.
After PCC static switch Switching power, ultracapacitor starts in 10 milliseconds, drives whole network operation 10-60 second, and lithium battery or lead-acid battery start in succession during this time, and last each generating equipment adjustment state is taken over energy storage device work.
Described generating equipment comprises diesel engine generator, photovoltaic generator, wind-driven generator or natural gas generator.
The beneficial effect that the present invention reaches:
The control method of micro-electrical network multiple-energy-source of the present invention, being mainly used in the lonely net of micro-electrical network starts, turns grid-connected, the grid-connected power grid control leaving in net from net, in distributed energy micro-grid system, determine main power source taking this power supply as benchmark, make micro-electrical network start or switch time all the time taking main power source as benchmark, solve the selection problem of system frequency in the situation that in micro-grid system, multiple power sources exists, make micro-grid system frequency keep stable, while having ensured that sub-microgrid is grid-connected, micro-grid system frequency stable.Method of the present invention can ensure the stable operation of micro-grid system in the time that micro-electrical network starts or switch, and is beneficial to the harmonic wave that regulates nonlinear load and circuit to cause.
Embodiment
The invention will be further described below.Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
Control method based on micro-electrical network multiple-energy-source of the present invention, comprises the following steps:
The starting method of microgrid under lonely net state: under lonely net state, what first micro-grid system started is diesel engine generator, in the time that diesel engine generator normally moves, taking diesel engine generator as main power source, photovoltaic generator and wind-driven generator generate electricity by way of merging two or more grid systems taking diesel engine generator as reference power source; After this, its load equipment normally starts.
Combination method from microgrid under net starting state: after the lonely net of microgrid starts, system belongs to from network operation, is now if desired incorporated into the power networks, and taking the electric power incoming line on netting twine road, city as standard, each microgrid generating equipment is adjusted into after consistent with civil power and carries out grid-connected operation.
Under grid-connected starting state microgrid from network method: after microgrid starts and is incorporated into the power networks, system belongs to and is incorporated into the power networks, now if desired from network operation, by the quick Switching power of PCC static switch, ultracapacitor starts in 10 milliseconds afterwards, according to field condition taking diesel engine generator or ultracapacitor as reference power supply, drive whole network operation 10-60 second, lithium battery or lead-acid battery energy storage device start in succession during this time, and last each generating equipment adjusts that match state is complete takes over energy storage device work.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.
Claims (3)
1. the control method based on micro-electrical network multiple-energy-source, it is characterized in that, it is reference power supply that micro-electrical network is all set a power supply in the time starting or switch, the lonely net of micro-electrical network starts, turn grid-connected, grid-connected from net leaves in network process, carries out the step that starts or switch respectively taking the reference power supply set as benchmark;
Comprise following steps:
The setting up procedure of micro-electrical network under lonely net state: under lonely net state, first micro-grid system starts diesel engine generator, in the time that diesel engine generator normally moves, taking diesel engine generator as main power source, photovoltaic generator and/or wind-driven generator generate electricity by way of merging two or more grid systems taking diesel engine generator as reference power supply; After this, load equipment normally starts;
Grid-connected step from micro-electrical network under net starting state: after the lonely net of micro-electrical network starts, micro-grid system belongs to from network operation, now if desired be incorporated into the power networks, taking the electric power incoming line on netting twine road, city as reference power supply, each micro-electrical network generating equipment be adjusted into after consistent with civil power and carry out grid-connected operation;
Under grid-connected starting state micro-electrical network from net step: after micro-electrical network starts and is incorporated into the power networks, micro-grid system belongs to and is incorporated into the power networks, now if desired from network operation, by PCC static switch Switching power, energy storage device starts afterwards, taking diesel engine generator or energy storage device as reference power supply, drive the whole network operation, last each generating equipment adjustment state is taken over described energy storage device work.
2. the control method based on micro-electrical network multiple-energy-source according to claim 1, is characterized in that, described energy storage device comprises ultracapacitor, lithium battery or lead-acid battery.
3. the control method based on micro-electrical network multiple-energy-source according to claim 1, it is characterized in that, when described energy storage device comprises ultracapacitor, while also comprising one of lithium battery or lead-acid battery,, after PCC static switch Switching power, ultracapacitor starts in 10 milliseconds, drive whole network operation 10-60 second, lithium battery or lead-acid battery start in succession during this time, and last each generating equipment adjustment state is taken over energy storage device work.
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| CN103560538B (en) * | 2013-11-08 | 2015-09-02 | 东南大学 | Micro-capacitance sensor protection and the switching integrated control method of Based PC C place's energy storage |
| CN105515209B (en) * | 2016-01-28 | 2017-09-22 | 山东鲁能智能技术有限公司 | A kind of micro-capacitance sensor mixed energy storage system and its control method |
| CN106953356A (en) * | 2017-04-07 | 2017-07-14 | 南京邮电大学 | Under a kind of island mode without energy storage wind-solar-diesel complementary electric power system and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170134A (en) * | 2011-05-05 | 2011-08-31 | 许继集团有限公司 | Microgrid synchronization and off-grid control method and seamless switching method |
| CN102315645A (en) * | 2011-09-09 | 2012-01-11 | 中国科学院电工研究所 | Energy router for distributed power generation |
| CN102355057A (en) * | 2011-09-25 | 2012-02-15 | 国网电力科学研究院 | Computer monitoring method for microgrid system |
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| US20080169704A1 (en) * | 2006-09-11 | 2008-07-17 | Coffman Electrical Equipment Co. | Advanced mobile power system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170134A (en) * | 2011-05-05 | 2011-08-31 | 许继集团有限公司 | Microgrid synchronization and off-grid control method and seamless switching method |
| CN102315645A (en) * | 2011-09-09 | 2012-01-11 | 中国科学院电工研究所 | Energy router for distributed power generation |
| CN102355057A (en) * | 2011-09-25 | 2012-02-15 | 国网电力科学研究院 | Computer monitoring method for microgrid system |
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