CN102420438A - Photovoltaic microgrid system with function of storing energy - Google Patents
Photovoltaic microgrid system with function of storing energy Download PDFInfo
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- CN102420438A CN102420438A CN2011103928009A CN201110392800A CN102420438A CN 102420438 A CN102420438 A CN 102420438A CN 2011103928009 A CN2011103928009 A CN 2011103928009A CN 201110392800 A CN201110392800 A CN 201110392800A CN 102420438 A CN102420438 A CN 102420438A
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention relates to a photovoltaic microgrid system with a function of storing energy. The photovoltaic microgrid system comprises a solar cell plate, a storage cell, a bidirectional power converter, a local load and a grid-connection switch, wherein a first selector switch is arranged between the solar cell plate and the bidirectional power converter; and a second selector switch is arranged between the storage cell and the bidirectional power converter. In the photovoltaic microgrid system, functions of photovoltaic grid-connected power generation, storage cell grid-connected energy storage, storage cell grid-connected discharging and storage cell island discharging can be realized by adopting the same bidirectional power converter, so that the system structure is simplified and the cost is reduced; furthermore, as the bidirectional power converter is formed by combining three totally independent single-phase power conversion units, the balance of three phases of output voltage can be guaranteed through independent control of the single-phase power conversion unit in an island state when the storage cell supplies power to the local load, particularly when three phases of local loads are unbalanced severely.
Description
Technical field
The present invention relates to a kind of microgrid system, relate in particular to a kind of photovoltaic microgrid system with energy-storage function.
Background technology
Microgrid is the abbreviation of micro power network, and microgrid is a notion of traditional relatively big electrical network, forms network by a plurality of distributed power sources and related load thereof according to certain topological structure, and is coupled to conventional electrical network through switch.From grid side, a microgrid can equivalence be a controllable electric power or load, and it can obtain energy from electrical network, when mains supply is not enough, and microgrid even can energy be provided to electrical network.
There are two kinds of typical operational modes in microgrid: microgrid and conventional electrical network parallel running under the normal condition, be called the pattern of being incorporated into the power networks, and electrical network and microgrid are shared out the work and helped one another, and are the electric in the microgrid jointly; When detecting the electric network fault or the electrical network quality of power supply and can not meet the demands, microgrid will in time break off the isolated island pattern that runs on electrical network, through switching the control strategy of each distributed power source in the microgrid, continue as the critical loads power supply in the microgrid, the raising reliability.When the grid side fault disappears, switch to the pattern of being incorporated into the power networks again.The proposition of microgrid notion is the milestone of distributed power generation development, for the technological large-scale application of distributed power generation provides possibility.
In recent years, be representative with the U.S., Japan and Europe, the microgrid Study on Technology is obtained breakthrough progress, and be expected in electrical energy production, occupy increasing proportion.Research institution as the tool authority in the U.S. and even the world; U.S. electric reliability engineering solution federation (CERTS) is the forerunner of world's distributed power generation microgrid area research; A series of books about microgrid notion and microgrid control that it is delivered are programmatic documents of microgrid research field, and CERTS has set up large-scale microgrid platform.In Europe; Microgrid is considered to fully develop distributed power generation; Give full play to the basis of distributed power generation advantage, set up a plurality of microgrid experiment porchs in Europe, at the microgrid control strategy, be incorporated into the power networks and aspect such as islet operation, microgrid protection, microgrid economy has obtained multinomial progress.Japan is walked in the prostatitis in the world at the application of distributed power generation and microgrid construction field.Japanese government has formulated improves the long-term plan of new forms of energy proportion in electric power system, and has built up a plurality of applied microgrid platforms.The distributed energy of China proportion in whole energy system is very low, just just begins in the exploration of microgrid technical field.
Existing photovoltaic microgrid system configuration with energy-storage function is as shown in Figure 1, and it comprises solar panel, storage battery, grid-connected power inverter, accumulator cell charging and discharging power inverter, local load and the switch etc. that is incorporated into the power networks.In existing scheme; The accumulator cell charging and discharging power inverter is that core constitutes with the three-phase bridge type converter; The balance of three-phase output voltage can not be guaranteed when under island state, giving local electric by storage battery; Especially when the serious imbalance of the local load of three-phase, this is the critical defect of existing scheme.
Summary of the invention
The present invention seeks in order to overcome the shortcoming of prior art, a kind of photovoltaic microgrid system with energy-storage function is provided.
Technical solution of the present invention is:
A kind of photovoltaic microgrid system with energy-storage function comprises solar panel, storage battery, power inverter, local load and the K switch 3 that is incorporated into the power networks, and its special character is that said power inverter is a bidirectional power converter; Be provided with the first diverter switch K1 between said solar panel and the bidirectional power converter; Be provided with the second diverter switch K2 between said storage battery and the bidirectional power converter; Said bidirectional power converter comprises the Power Conversion unit of three parallel connections, and said Power Conversion unit comprises input LC filter, single-phase inverter, output LC filter, the output transformer that connects successively; The input of the input LC filter of said three Power Conversion unit is connected with an end of first diverter switch and second diverter switch simultaneously; The secondary high-pressure side of the output transformer of said three Power Conversion unit links to each other with the threephase load and the switch that is incorporated into the power networks respectively; The marginal low-pressure end ground connection of the output transformer of said three Power Conversion unit.
Above-mentioned single-phase inverter is the electric bridge that four self-turn-off devices are formed, and two inputs of said electric bridge connect the output of input LC filter respectively, and two outputs of said electric bridge connect two inputs of output LC filter respectively.
Above-mentioned self-turn-off device is IGBT or MOSFET; The electronic switch that the said first diverter switch K1, the second diverter switch K2, the K switch that is incorporated into the power networks 3 constitute for machine contactor, relay or thyristor.
Advantage of the present invention: the present invention adopts same bidirectional power converter can realize the function of parallel network power generation, storage battery grid-connected energy storage, storage battery grid-connected discharge, the discharge of storage battery isolated island; With existing scheme simplified in comparison system configuration; Save cost; And because bidirectional power converter is formed by three complete separate single-phase Power Conversion unit combination; Through the independent control of single-phase power converter unit, the balance of three-phase output voltage in the time of can guaranteeing under the island state to give local electric by storage battery is especially serious when uneven in the local load of three-phase.
Description of drawings
Fig. 1 is existing photovoltaic microgrid system configuration with energy-storage function;
Fig. 2 has the photovoltaic microgrid system configuration sketch map of energy-storage function for the present invention.
Embodiment
Referring to Fig. 2, the photovoltaic microgrid system schema with energy-storage function that the present invention proposes comprises solar panel, storage battery, diverter switch K1 and K2, bidirectional power converter, local load and the K switch 3 etc. that is incorporated into the power networks.Bidirectional power converter is the core of photovoltaic microgrid system.Bidirectional power converter comprises three fully independently Power Conversion unit, and each Power Conversion unit comprises input LC filter, single-phase inverter, output LC filter, output transformer.The balance of three-phase output voltage when this knockdown transformer configuration can guarantee under the island state to give local electric by storage battery is especially serious when uneven in the local load of three-phase.Single-phase inverter is made up of 4 self-turn-off devices, optional IGBT of self-turn-off device or MOSFET.K switch 1, K2, the optional mechanical switch of K3, like contactor, relay, the also optional electronic switch that constitutes by thyristor.
In this system; Solar panel is a generator unit; Storage battery is an energy-storage units, and bidirectional power converter is accomplished the control of power flow direction, both can the output electric energy (or energy of battery stores) of solar panel be transported to electrical network (or local load); Can energy be transported to storage battery from electrical network again, local load is the power consumption unit.
Through bidirectional power converter being applied the Different control mode, the photovoltaic microgrid can be operated in following four kinds of mode of operations:
(1) parallel network power generation
When system was in the parallel network power generation pattern, K1 was closed, K2 breaks off, K3 is closed.Under this pattern, the electric energy that solar panel sends arrives electrical network through the bidirectional power converter inversion.
(2) storage battery grid-connected energy storage
When system was in storage battery grid-connected energy storage pattern, K1 broke off, K2 is closed, K3 is closed.Under this pattern, the electric energy of electrical network is stored in the storage battery through bidirectional power converter.
(3) storage battery grid-connected discharge
When system was in storage battery grid-connected discharge mode, K1 broke off, K2 is closed, K3 is closed.Under this pattern, the energy of battery stores arrives electrical network through the bidirectional power converter inversion.
(4) storage battery isolated island discharge
When system was in storage battery isolated island discharge mode, K1 broke off, K2 is closed, K3 breaks off.Under this pattern, the energy of battery stores to local load, provides the AC energy of stable three-phase equilibrium for local load through the bidirectional power converter inversion.
Claims (3)
1. the photovoltaic microgrid system with energy-storage function comprises solar panel, storage battery, power inverter, local load and the K switch 3 that is incorporated into the power networks, and it is characterized in that: said power inverter is a bidirectional power converter; Be provided with the first diverter switch K1 between said solar panel and the bidirectional power converter; Be provided with the second diverter switch K2 between said storage battery and the bidirectional power converter; Said bidirectional power converter comprises the Power Conversion unit of three parallel connections, and said Power Conversion unit comprises input LC filter, single-phase inverter, output LC filter, the output transformer that connects successively; The input of the input LC filter of said three Power Conversion unit is connected with an end of first diverter switch and second diverter switch simultaneously; The secondary high-pressure side of the output transformer of said three Power Conversion unit links to each other with the threephase load and the switch that is incorporated into the power networks respectively; The marginal low-pressure end ground connection of the output transformer of said three Power Conversion unit.
2. the photovoltaic microgrid system with energy-storage function according to claim 1; It is characterized in that: said single-phase inverter is the electric bridge that four self-turn-off devices are formed; Two inputs of said electric bridge connect the output of input LC filter respectively, and two outputs of said electric bridge connect two inputs of output LC filter respectively.
3. the photovoltaic microgrid system with energy-storage function according to claim 1 and 2, it is characterized in that: said self-turn-off device is IGBT or MOSFET; The electronic switch that the said first diverter switch K1, the second diverter switch K2, the K switch that is incorporated into the power networks 3 constitute for machine contactor, relay or thyristor.
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| CN2011103928009A CN102420438A (en) | 2011-12-01 | 2011-12-01 | Photovoltaic microgrid system with function of storing energy |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769382A (en) * | 2012-07-19 | 2012-11-07 | 上海交通大学 | Radial direct current micro grid |
| CN102983770A (en) * | 2012-12-24 | 2013-03-20 | 合肥工业大学 | Four-leg parallel inverter and method for compensating zero-sequence current on site with inverter |
| CN103532214A (en) * | 2013-09-17 | 2014-01-22 | 南京航空航天大学 | Photovoltaic power generation system structure integrating energy storage and grid-connected and off-grid power supply functions and control method |
| CN103872677A (en) * | 2012-12-18 | 2014-06-18 | 西门子公司 | Power generation unit and energy output equipment |
| CN104078971A (en) * | 2014-07-10 | 2014-10-01 | 广东工业大学 | Microgrid three-phase-balanced and electricity-optimized sub-grid structure and control method |
| CN105305475A (en) * | 2014-05-29 | 2016-02-03 | �林昌明 | Three-phase grid-connected power inverter module applicable to optical record integrated power generation system |
| WO2016015772A1 (en) * | 2014-07-31 | 2016-02-04 | Abb Technology Ltd | Control of a microgrid |
| CN105720602A (en) * | 2016-01-21 | 2016-06-29 | 易事特集团股份有限公司 | Photovoltaic grid-connected power generating energy storage inverter grid-connected-off-grid system and operation device thereof |
| CN105896583A (en) * | 2016-06-16 | 2016-08-24 | 任磊 | Peak load shifting and power quality comprehensive treatment system and working method thereof |
| CN103746592B (en) * | 2013-12-31 | 2017-05-31 | 华为技术有限公司 | Two-way inversion system and two-way inverter circuit |
| CN108173280A (en) * | 2017-12-29 | 2018-06-15 | 北京天诚同创电气有限公司 | Light stores up integral system |
| CN111864608A (en) * | 2019-04-30 | 2020-10-30 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | A device is examined in fortune for open-air collection dress distribution system |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769382A (en) * | 2012-07-19 | 2012-11-07 | 上海交通大学 | Radial direct current micro grid |
| CN103872677A (en) * | 2012-12-18 | 2014-06-18 | 西门子公司 | Power generation unit and energy output equipment |
| CN103872677B (en) * | 2012-12-18 | 2016-05-18 | 西门子公司 | Generator unit and energy output equipment |
| CN102983770A (en) * | 2012-12-24 | 2013-03-20 | 合肥工业大学 | Four-leg parallel inverter and method for compensating zero-sequence current on site with inverter |
| CN102983770B (en) * | 2012-12-24 | 2015-09-09 | 合肥工业大学 | The inverter that a kind of four bridge legs is grid-connected and the method with its local compensation zero-sequence current |
| CN103532214A (en) * | 2013-09-17 | 2014-01-22 | 南京航空航天大学 | Photovoltaic power generation system structure integrating energy storage and grid-connected and off-grid power supply functions and control method |
| CN103746592B (en) * | 2013-12-31 | 2017-05-31 | 华为技术有限公司 | Two-way inversion system and two-way inverter circuit |
| CN105305475A (en) * | 2014-05-29 | 2016-02-03 | �林昌明 | Three-phase grid-connected power inverter module applicable to optical record integrated power generation system |
| CN105305475B (en) * | 2014-05-29 | 2018-07-10 | 西宁兆业新能源技术开发有限公司 | A kind of three-phase grid power inverting module suitable for light storage integrated power generation system |
| CN104078971A (en) * | 2014-07-10 | 2014-10-01 | 广东工业大学 | Microgrid three-phase-balanced and electricity-optimized sub-grid structure and control method |
| WO2016015772A1 (en) * | 2014-07-31 | 2016-02-04 | Abb Technology Ltd | Control of a microgrid |
| CN105720602A (en) * | 2016-01-21 | 2016-06-29 | 易事特集团股份有限公司 | Photovoltaic grid-connected power generating energy storage inverter grid-connected-off-grid system and operation device thereof |
| CN105720602B (en) * | 2016-01-21 | 2019-02-05 | 易事特集团股份有限公司 | Parallel network power generation energy storage inverter is grid-connected-off-grid system and its running gear |
| CN105896583A (en) * | 2016-06-16 | 2016-08-24 | 任磊 | Peak load shifting and power quality comprehensive treatment system and working method thereof |
| CN105896583B (en) * | 2016-06-16 | 2019-04-23 | 任磊 | A kind of peak load shifting and power quality harnessed synthetically system and its working method |
| CN108173280A (en) * | 2017-12-29 | 2018-06-15 | 北京天诚同创电气有限公司 | Light stores up integral system |
| CN111864608A (en) * | 2019-04-30 | 2020-10-30 | 中国航天科工飞航技术研究院（中国航天海鹰机电技术研究院） | A device is examined in fortune for open-air collection dress distribution system |
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