CN102025155A - DC (direct current) distribution-based microgrid system - Google Patents
DC (direct current) distribution-based microgrid system Download PDFInfo
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- CN102025155A CN102025155A CN2010106134919A CN201010613491A CN102025155A CN 102025155 A CN102025155 A CN 102025155A CN 2010106134919 A CN2010106134919 A CN 2010106134919A CN 201010613491 A CN201010613491 A CN 201010613491A CN 102025155 A CN102025155 A CN 102025155A
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- 238000010248 power generation Methods 0.000 claims abstract description 34
- 238000004146 energy storage Methods 0.000 claims description 15
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- 230000000694 effects Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 1
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- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
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- 238000001764 infiltration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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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 discloses a DC (direct current) distribution-based microgrid system, which belongs to the technical field of microgrids. The microgrid system comprises a DC distribution circuit, at least one wind power generation device with an AC/DC rectifier, at least one photovoltaic power generation device with a corresponding DC/DC converter, a set of power storage batteries and a corresponding DC/DC converter thereof, at least one DC load with a corresponding DC/DC converter, at least one AC load with a corresponding DC/AC inverter, an AC/DC rectifying/inverting device accessing to a large power grid, and a microgrid control system. When a microgrid is in a state of connecting with the large power system, the AC/DC rectifying/inverting device accessing to the large power grid can supply power for the microgrid, and can receive power from the microgrid; and when the micronet is in an isolated operation state, the microgrid control system controls the power storage batteries and the controllable loads, so that the total generated power in the microgrid is in equilibrium with the total load in the microgrid.
Description
Technical field
The invention belongs to little electric power network technique field, be specially a kind of microgrid system based on DC distribution.
Background technology
Development along with the new-generation technology of the fossil fuel that comprises regenerative resources such as wind-powered electricity generation, photovoltaic and high-efficiency cleaning, (distributed generation system DGS) day by day becomes a kind of effective way that satisfies the load growth demand, reduces environmental pollution, raising comprehensive utilization of energy efficient and power supply reliability to distributed generation system.DGS have small investment, generation mode flexibly, can with advantage such as environmental compatible, in power distribution network, be widely used, but the extensive infiltration of DGS has also produced some negative effects, higher as distributed power generation unit cost of access, control is complicated.In addition, analyze from the angle of system, DGS is uncontrollable generator unit, so system always attempts to take to isolate, the mode of cutter is controlled the micro generation system, to eliminate it to the voltage of big system and the impact of frequency.According to document, when electric power system was broken down, cutter was out of service at once for DGS, but this has limited the operational mode of distributed power generation, has weakened its advantage and potential.In order to reduce the adverse effect of DGS to major network, bring into play its Inherent advantage simultaneously, a rational and effective solution is to adopt systems approach, regards Blast Furnace Top Gas Recovery Turbine Unit (TRT) and corresponding load as subsystem, i.e. a microgrid.At present, in the world the definition of microgrid there is not unified standard.(the consortium for electric reliability technologysolution of U.S. electric reliability engineering measure solution federation, CERTS) microgrid is defined as follows: microgrid is a kind of system that is made up of jointly load and micro power, and it can provide electric energy and heat simultaneously; The power supply of microgrid inside mainly is to be responsible for power conversion by power electronic equipment, and necessary control is provided; The outside big relatively electrical network of microgrid shows as single controllable, satisfies the requirement of user to the quality of power supply and power supply reliability, fail safe simultaneously.
Under this structure of microgrid, a plurality of DGS part provides electric energy and voltage to support to important load on the spot, this has reduced to a great extent directly buys the burden of electricity and power line transmission from big electrical network, and can strengthen the ability that important load resists the hoc network fault effects.In addition, break down or its quality of power supply does not meet at big electrical network
Under the situation of system standard, microgrid can carry out independent operating with lonely net pattern, guarantees the normal operation of microgrid self and big electrical network, thereby improves power supply reliability and fail safe.Therefore, lonely network operation is the most important ability of microgrid.From the angle of big electrical network, microgrid is a modular integral unit as generator in the electrical network or load.On the other hand, from user side, microgrid is the electric power system of an autonomous operation, and it can satisfy the requirement of different user to the quality of power supply and reliability.
At present, China and even little electrical network in the world be all based on the Alternating Current Power Supply technology, thereby have following problems:
1. when lonely network operation, not only need balance active power, also need the balance reactive power, therefore the reactive-load compensation equipment of a constant volume need be installed in microgrid;
2. when having nonlinear load in the microgrid, the harmonic current that also needs the design and installation filter to come the filtering nonlinear load to be produced;
3. when big (as bigger island microgrid), the radius of electricity supply of microgrid is bigger, needs to build the electric line of different electric pressures and bulky 50Hz Industrial Frequency Transformer for the area that covers when microgrid;
More than 3 problems all increased the construction cost of microgrid and the difficulty of microgrid operation control to a certain extent.
Summary of the invention
At problems of the prior art, the object of the present invention is to provide a kind of technical scheme of the microgrid system based on DC distribution.
Described microgrid system based on DC distribution is characterized in that comprising: DC distribution circuit, one insert wind power generation plant, at least one photovoltaic power generation apparatus with corresponding DC/DC current transformer of AC/DC rectification/inverter, at least one band AC/DC rectifier of big electrical network, one group of energy storage battery and corresponding D C/DC current transformer thereof, at least one DC load with corresponding DC/DC current transformer, at least one AC load with corresponding DC/AC inverter, a microgrid control system; The direct current side joint DC distribution circuit of the corresponding AC/DC rectifier of described wind power generation plant, the AC side power generation device of giving a dinner for a visitor from afar; One side joint DC distribution circuit of described photovoltaic power generation apparatus corresponding D C/DC current transformer, another side joint photovoltaic power generation apparatus; Described energy storage battery corresponding D C/DC current transformer one side joint DC distribution circuit, another side joint energy storage battery; One side joint DC distribution circuit of the DC/DC current transformer of described DC load, another side joint DC load; The DC side of the DC/AC inverter of described AC load inserts the DC distribution circuit, exchanges the side joint AC load; The DC side of the AC/DC rectification/inverter of the big electrical network of described access inserts the DC distribution circuit, exchanges the big electrical network of side joint.
Described microgrid system based on DC distribution is characterized in that wind power generation plant, at least one photovoltaic power generation apparatus with corresponding DC/DC current transformer, energy storage battery and corresponding D C/DC current transformer thereof, at least one DC load with corresponding DC/DC current transformer, at least one AC load with corresponding DC/AC inverter, the microgrid control system of described DC distribution circuit, at least one band AC/DC rectifier constitutes microgrid.
Described microgrid system based on DC distribution is characterized in that the working method of described microgrid control system control microgrid, big electrical network is as follows:
Microgrid, big electrical network are incorporated into the power networks: microgrid and big electrical network link to each other, and the interior total load of microgrid inserts the AC/DC rectification/inverter of big electrical network and powers to microgrid during greater than the total generated output in the microgrid; Total generated output in the microgrid inserts the AC/DC rectification/inverter of big electrical network and accept power from microgrid during greater than the total load in the microgrid;
The microgrid isolated operation: microgrid control system control energy storage battery, AC load, DC load make total generated output and the interior total load balance of microgrid in the microgrid.
Described microgrid system based on DC distribution is characterized in that described wind power generation plant and photovoltaic power generation apparatus are to DC distribution circuit input electric energy.
Described microgrid system based on DC distribution is characterized in that described DC load and AC load absorb electric energy from the DC distribution circuit.
The present invention with compare based on the microgrid that exchanges technology, have the following advantages:
1. do not need reactive-load compensation equipment;
2. do not need filter;
3. the electric line that does not need different electric pressures;
4. do not need bulky 50Hz Industrial Frequency Transformer;
5. control strategy is fairly simple: the balance and the direct voltage that only need control active power.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
The present invention will be further described below in conjunction with Figure of description:
As shown in the figure, microgrid system based on DC distribution comprises: DC distribution circuit 1, one insert wind power generation plant 3, at least one photovoltaic power generation apparatus 4 with corresponding DC/DC current transformer of AC/DC rectification/inverter 2, at least one band AC/DC rectifier of big electrical network, one group of energy storage battery 5 and corresponding D C/DC current transformer thereof, at least one DC load 7 with corresponding DC/DC current transformer, at least one AC load 6 with corresponding DC/AC inverter, a microgrid control system 8; The direct current side joint DC distribution circuit 1 of described wind power generation plant 3 corresponding AC/DC rectifiers, the AC side power generation device 3 of giving a dinner for a visitor from afar; One side joint DC distribution circuit 1 of described photovoltaic power generation apparatus 4 corresponding D C/DC current transformers, another side joint photovoltaic power generation apparatus 4; Described energy storage battery 5 corresponding D C/DC current transformers one side joint DC distribution circuit 1, another side joint energy storage battery 5; One side joint DC distribution circuit 1 of the DC/DC current transformer of described DC load 7, another side joint DC load 7; The DC side of the DC/AC inverter of described AC load 6 inserts DC distribution circuit 1, exchanges side joint AC load 6; The DC side of the AC/DC rectification/inverter 2 of the big electrical network of described access inserts DC distribution circuit 1, exchanges the big electrical network of side joint; Wind power generation plant 3 and photovoltaic power generation apparatus 4 are to DC distribution circuit 1 input electric energy, and DC load 7 and AC load 6 absorb electric energy from DC distribution circuit 1.
Wherein, DC distribution circuit 1, wind power generation plant 3, at least one photovoltaic power generation apparatus 4 with corresponding DC/DC current transformer, energy storage battery 5 and the corresponding D C/DC current transformer thereof of at least one band AC/DC rectifier, at least one DC load 7 with corresponding DC/DC current transformer, at least one AC load 6 with corresponding DC/AC inverter, microgrid control system 8 constitute microgrid; The working method of described microgrid control system 8 control microgrids, big electrical network is as follows:
Microgrid, big electrical network are incorporated into the power networks: microgrid and big electrical network link to each other, and the interior total load of microgrid inserts the AC/DC rectification/inverter of big electrical network and powers to microgrid during greater than the total generated output in the microgrid; Total generated output in the microgrid inserts the AC/DC rectification/inverter of big electrical network and accept power from microgrid during greater than the total load in the microgrid;
The microgrid isolated operation: microgrid control system control energy storage battery, controlled load (AC load, DC load) make total generated output and the interior total load balance of microgrid in the microgrid.
Claims (5)
1. based on the microgrid system of DC distribution, it is characterized in that comprising: DC distribution circuit, one insert wind power generation plant, at least one photovoltaic power generation apparatus with corresponding DC/DC current transformer of AC/DC rectification/inverter, at least one band AC/DC rectifier of big electrical network, one group of energy storage battery and corresponding D C/DC current transformer thereof, at least one DC load with corresponding DC/DC current transformer, at least one AC load with corresponding DC/AC inverter, a microgrid control system; The direct current side joint DC distribution circuit of the corresponding AC/DC rectifier of described wind power generation plant, the AC side power generation device of giving a dinner for a visitor from afar; One side joint DC distribution circuit of described photovoltaic power generation apparatus corresponding D C/DC current transformer, another side joint photovoltaic power generation apparatus; Described energy storage battery corresponding D C/DC current transformer one side joint DC distribution circuit, another side joint energy storage battery; One side joint DC distribution circuit of the DC/DC current transformer of described DC load, another side joint DC load; The DC side of the DC/AC inverter of described AC load inserts the DC distribution circuit, exchanges the side joint AC load; The DC side of the AC/DC rectification/inverter of the big electrical network of described access inserts the DC distribution circuit, exchanges the big electrical network of side joint.
2. the microgrid system based on DC distribution according to claim 1 is characterized in that wind power generation plant, at least one photovoltaic power generation apparatus with corresponding DC/DC current transformer, energy storage battery and corresponding D C/DC current transformer thereof, at least one DC load with corresponding DC/DC current transformer, at least one AC load with corresponding DC/AC inverter, the microgrid control system of described DC distribution circuit, at least one band AC/DC rectifier constitutes microgrid.
3. the microgrid system based on DC distribution according to claim 2 is characterized in that the working method of described microgrid control system control microgrid, big electrical network is as follows:
Microgrid, big electrical network are incorporated into the power networks: microgrid and big electrical network link to each other, and the interior total load of microgrid inserts the AC/DC rectification/inverter of big electrical network and powers to microgrid during greater than the total generated output in the microgrid; Total generated output in the microgrid inserts the AC/DC rectification/inverter of big electrical network and accept power from microgrid during greater than the total load in the microgrid;
The microgrid isolated operation: microgrid control system control energy storage battery, AC load, DC load make total generated output and the interior total load balance of microgrid in the microgrid.
4. the microgrid system based on DC distribution according to claim 1 is characterized in that described wind power generation plant and photovoltaic power generation apparatus are to DC distribution circuit input electric energy.
5. the microgrid system based on DC distribution according to claim 1 is characterized in that described DC load and AC load absorb electric energy from the DC distribution circuit.
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290851A (en) * | 2011-08-15 | 2011-12-21 | 许继电源有限公司 | Large-scale energy storing device and main circuit thereof |
| CN102290841A (en) * | 2011-08-13 | 2011-12-21 | 罗俊亚 | Peak clipping and valley filling electric vehicle swapping station for distribution network |
| GB2482114A (en) * | 2010-07-16 | 2012-01-25 | Smarter Energy Systems Ltd | Direct current power transmission grid |
| CN102420455A (en) * | 2011-12-12 | 2012-04-18 | 合肥聚能新能源科技有限公司 | Application of battery management system to photovoltaic industry and control method |
| CN102437793A (en) * | 2011-10-21 | 2012-05-02 | 浙江昱能光伏科技集成有限公司 | Distributed grid-connected solar energy photovoltaic system |
| CN102593832A (en) * | 2012-03-15 | 2012-07-18 | 武汉大学 | Three-wire DC microgrid system suitable for modern buildings and control method thereof. |
| CN102664429A (en) * | 2012-05-29 | 2012-09-12 | 国电联合动力技术有限公司 | Grid-connected non-networking micro-grid system and control protection method thereof |
| CN102684183A (en) * | 2012-05-08 | 2012-09-19 | 吕遥 | DC LAN (Direct Current Local Area Network)-based distributed power generation system and control method |
| CN102931683A (en) * | 2012-11-02 | 2013-02-13 | 浙江工业大学 | Wind-solar direct current microgrid grid-connection control method based on substation typical daily load curve |
| CN103236712A (en) * | 2013-04-08 | 2013-08-07 | 嘉兴清源电气科技有限公司 | Direct-current micro-grid system and control method thereof |
| CN103257299A (en) * | 2013-05-20 | 2013-08-21 | 国家电网公司 | Microgrid technical verification platform device based on hybrid energy storage |
| CN103618372A (en) * | 2013-12-11 | 2014-03-05 | 厦门大学 | Photovoltaic direct current micro-grid system |
| CN105958466A (en) * | 2016-05-13 | 2016-09-21 | 上海电机学院 | DC micro-grid system based on multi-port DC transformer substation |
| CN106033885A (en) * | 2015-03-20 | 2016-10-19 | 神华集团有限责任公司 | Direct-current micro-grid power distribution system |
| CN106374517A (en) * | 2016-11-15 | 2017-02-01 | 湖南省德沃普储能有限公司 | Battery energy storage system for alleviating problem of photovoltaic power generation abandoning and limiting and control method therefor |
| US9660439B2 (en) | 2015-06-05 | 2017-05-23 | General Electric Company | Direct current power distribution and protection system |
| US9923367B2 (en) | 2015-03-26 | 2018-03-20 | State Grid Heibei Electic Power Research Institute | Anti-islanding method for distributed generator in direct current distribution grid and anti-islanding device therefor |
| US9991701B2 (en) | 2015-10-15 | 2018-06-05 | General Electric Company | Direct current power distribution and conversion system |
| CN113472020A (en) * | 2021-06-29 | 2021-10-01 | 国网江苏省电力有限公司电力科学研究院 | Novel AC/DC hybrid data center power supply control system and control method |
| US20220116075A1 (en) * | 2020-10-08 | 2022-04-14 | Melexis Technologies Nv | Transmitter for power line communication |
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| CN101436778A (en) * | 2008-12-12 | 2009-05-20 | 华南理工大学 | Networking method for minitype electric network |
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| CN101436778A (en) * | 2008-12-12 | 2009-05-20 | 华南理工大学 | Networking method for minitype electric network |
Cited By (32)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2482114A (en) * | 2010-07-16 | 2012-01-25 | Smarter Energy Systems Ltd | Direct current power transmission grid |
| CN102290841A (en) * | 2011-08-13 | 2011-12-21 | 罗俊亚 | Peak clipping and valley filling electric vehicle swapping station for distribution network |
| CN102290851B (en) * | 2011-08-15 | 2014-04-02 | 许继电源有限公司 | Large-scale energy storing device and main circuit thereof |
| CN102290851A (en) * | 2011-08-15 | 2011-12-21 | 许继电源有限公司 | Large-scale energy storing device and main circuit thereof |
| CN102437793A (en) * | 2011-10-21 | 2012-05-02 | 浙江昱能光伏科技集成有限公司 | Distributed grid-connected solar energy photovoltaic system |
| CN102437793B (en) * | 2011-10-21 | 2014-07-23 | 浙江昱能科技有限公司 | Distributed grid-connected solar energy photovoltaic system |
| CN102420455A (en) * | 2011-12-12 | 2012-04-18 | 合肥聚能新能源科技有限公司 | Application of battery management system to photovoltaic industry and control method |
| CN102593832B (en) * | 2012-03-15 | 2014-04-02 | 武汉大学 | Three-wire DC microgrid system suitable for modern buildings and control method thereof. |
| CN102593832A (en) * | 2012-03-15 | 2012-07-18 | 武汉大学 | Three-wire DC microgrid system suitable for modern buildings and control method thereof. |
| CN102684183B (en) * | 2012-05-08 | 2014-08-20 | 吕遥 | DC LAN (Direct Current Local Area Network)-based distributed power generation system and control method |
| CN102684183A (en) * | 2012-05-08 | 2012-09-19 | 吕遥 | DC LAN (Direct Current Local Area Network)-based distributed power generation system and control method |
| CN102664429B (en) * | 2012-05-29 | 2014-05-14 | 国电联合动力技术有限公司 | Grid-connected non-networking micro-grid system and control protection method thereof |
| CN102664429A (en) * | 2012-05-29 | 2012-09-12 | 国电联合动力技术有限公司 | Grid-connected non-networking micro-grid system and control protection method thereof |
| CN102931683A (en) * | 2012-11-02 | 2013-02-13 | 浙江工业大学 | Wind-solar direct current microgrid grid-connection control method based on substation typical daily load curve |
| CN102931683B (en) * | 2012-11-02 | 2015-04-22 | 浙江工业大学 | Wind-solar direct current microgrid grid-connection control method based on substation typical daily load curve |
| CN103236712A (en) * | 2013-04-08 | 2013-08-07 | 嘉兴清源电气科技有限公司 | Direct-current micro-grid system and control method thereof |
| CN103257299A (en) * | 2013-05-20 | 2013-08-21 | 国家电网公司 | Microgrid technical verification platform device based on hybrid energy storage |
| CN103618372B (en) * | 2013-12-11 | 2016-04-06 | 厦门大学 | A kind of photovoltaic direct current micro-grid system |
| CN103618372A (en) * | 2013-12-11 | 2014-03-05 | 厦门大学 | Photovoltaic direct current micro-grid system |
| CN106033885B (en) * | 2015-03-20 | 2020-03-24 | 国家能源投资集团有限责任公司 | DC micro-grid power distribution system |
| CN106033885A (en) * | 2015-03-20 | 2016-10-19 | 神华集团有限责任公司 | Direct-current micro-grid power distribution system |
| US9923367B2 (en) | 2015-03-26 | 2018-03-20 | State Grid Heibei Electic Power Research Institute | Anti-islanding method for distributed generator in direct current distribution grid and anti-islanding device therefor |
| CN106159985B (en) * | 2015-03-26 | 2018-11-27 | 国网河北省电力公司电力科学研究院 | A kind of anti-isolated island method and apparatus of DC distribution net distributed generation resource |
| US9660439B2 (en) | 2015-06-05 | 2017-05-23 | General Electric Company | Direct current power distribution and protection system |
| US9991701B2 (en) | 2015-10-15 | 2018-06-05 | General Electric Company | Direct current power distribution and conversion system |
| CN105958466A (en) * | 2016-05-13 | 2016-09-21 | 上海电机学院 | DC micro-grid system based on multi-port DC transformer substation |
| CN106374517A (en) * | 2016-11-15 | 2017-02-01 | 湖南省德沃普储能有限公司 | Battery energy storage system for alleviating problem of photovoltaic power generation abandoning and limiting and control method therefor |
| CN106374517B (en) * | 2016-11-15 | 2019-02-26 | 湖南德沃普新能源有限公司 | A kind of battery energy storage system control method for reducing photovoltaic plant abandoning light and rationing the power supply |
| US20220116075A1 (en) * | 2020-10-08 | 2022-04-14 | Melexis Technologies Nv | Transmitter for power line communication |
| US11552677B2 (en) * | 2020-10-08 | 2023-01-10 | Melexis Technologies Nv | Transmitter for power line communication |
| CN113472020A (en) * | 2021-06-29 | 2021-10-01 | 国网江苏省电力有限公司电力科学研究院 | Novel AC/DC hybrid data center power supply control system and control method |
| CN113472020B (en) * | 2021-06-29 | 2024-04-16 | 国网江苏省电力有限公司电力科学研究院 | Novel AC/DC hybrid data center power supply control system and control method |
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