CN105262134A - Household nano-network system and community-level micro-grid system - Google Patents
Household nano-network system and community-level micro-grid system Download PDFInfo
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- CN105262134A CN105262134A CN201510746334.8A CN201510746334A CN105262134A CN 105262134 A CN105262134 A CN 105262134A CN 201510746334 A CN201510746334 A CN 201510746334A CN 105262134 A CN105262134 A CN 105262134A
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- 238000004146 energy storage Methods 0.000 claims abstract description 20
- 238000010248 power generation Methods 0.000 claims abstract description 19
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 13
- 230000006855 networking Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- 102100022210 COX assembly mitochondrial protein 2 homolog Human genes 0.000 description 2
- 101000900446 Homo sapiens COX assembly mitochondrial protein 2 homolog Proteins 0.000 description 2
- 101000649946 Homo sapiens Vacuolar protein sorting-associated protein 29 Proteins 0.000 description 2
- 102100028290 Vacuolar protein sorting-associated protein 29 Human genes 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002070 nanowire Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- 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
-
- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
- H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The application discloses a family network receiving system and a community-level micro-grid system, wherein the community-level micro-grid system comprises a plurality of family network receiving systems, each family network receiving system comprises new energy electric equipment, a new energy power generation system, a bidirectional DC/DC and an energy storage battery, and a direct current bus of the new energy electric equipment is connected with household appliances. The direct current bus of the new energy electric equipment can be directly connected to the direct current electric energy drive of the new energy power generation system, and compared with the traditional method, the inversion process of current is omitted. Therefore, compared with the direct current bus power supply of the new energy electric equipment, the direct current bus power supply of the household appliance can save multiple times of conversion, thereby improving the energy utilization rate.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a household nano-grid system and a community-level micro-grid system.
Background
The micro-grid is a small-sized power generation and distribution system which is composed of a distributed power supply, an energy storage device, a power electronic device, a load and a protection device and can realize self control, protection and management. The micro-grid can be connected with a large power grid in a grid mode for operation, energy can be absorbed from the large power grid when the energy is insufficient, and the energy can be fed back to the large power grid when the energy is sufficient. When the large power grid fails and is powered off, the micro power grid can operate independently to continuously supply power to loads in the area, and therefore power supply reliability is improved. The electric energy is transmitted in an alternating current mode through an alternating current microgrid, and the electric energy is transmitted in a direct current mode through a direct current microgrid.
The structure of a typical existing direct-current micro-grid is shown in fig. 1, wherein a photovoltaic 01 is connected to a direct-current bus through a DC/DC (direct current converter) 001, a wind energy 02 is connected to the direct-current bus through an AC/DC (alternating current-direct current converter) 002, an energy storage device 03 is connected to the direct-current bus through a DC/DC003, and then the connection with a large grid 04 is realized through an independent AC/DC 004. Such a DC microgrid supplies AC loads 05 via DC/AC (direct current-alternating current converter) 005, or supplies DC loads 06 via DC/DC006, or directly supplies DC loads 07. However, for some household appliances that cannot directly utilize the dc load of the dc microgrid, an additional inverter is required to convert dc to dc. The AC micro-grid is commonly applied at present, and when the AC micro-grid is used for supplying power to household appliances, new energy such as photovoltaic and the like can meet the power supply requirement through multiple times of current transformation.
In conclusion, the new energy needs to undergo multiple conversion when supplying power to the household appliance, so that the electric energy loss is large and the energy utilization efficiency is not high.
Disclosure of Invention
In view of this, the invention provides a home network receiving system and a community-level microgrid system, so as to improve the energy utilization rate when new energy is adopted to supply power to household appliances.
A home networking system comprising:
the system comprises new energy electric equipment and a control system, wherein the new energy electric equipment is provided with a direct current bus which can be connected with a household appliance and can supply power to the household appliance;
the new energy power generation system is connected with the new energy power utilization equipment;
bidirectional DC/DC;
the energy storage battery is connected to the direct current bus through the bidirectional DC/DC and can be charged and discharged under the control of the bidirectional DC/DC.
Preferably, the method further comprises the following steps:
the input end is connected with the direct current bus, the output end is connected with the household appliance, and the bus voltage can be converted into DC/DC of voltage grade which can be directly utilized by the household appliance.
Preferably, the method further comprises the following steps:
charging piles;
through fill electric pile access alternating current bus, and can be in fill the car battery that carries out charge-discharge under electric pile's control.
Preferably, the new energy power generation system is connected with the direct current bus.
Preferably, the new energy electric equipment is a photovoltaic air conditioner.
A community-level microgrid system comprising: the system comprises a plurality of household network receiving systems, wherein direct current bus sides of new energy electric equipment in each household network receiving system are interconnected, and alternating current sides of the new energy electric equipment are interconnected.
According to the technical scheme, the invention provides a family net accommodating system and a community-level micro-grid system, wherein the community-level micro-grid system comprises a plurality of family net accommodating systems, each family net accommodating system comprises new energy electric equipment, a new energy power generation system, a bidirectional DC/DC and an energy storage battery, and a direct current bus of the new energy electric equipment is connected with household appliances. The direct current bus of the new energy electric equipment can be directly connected to the direct current electric energy drive of the new energy power generation system, and compared with the traditional method, the inversion process of current is omitted. Therefore, compared with the direct current bus power supply of the new energy electric equipment, the direct current bus power supply of the household appliance can save multiple times of conversion, thereby improving the energy utilization rate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a dc microgrid according to an embodiment of the prior art;
fig. 2 is a schematic structural diagram of a home network access system disclosed in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of another home networking system disclosed by the embodiment of the invention;
fig. 4 is a schematic structural diagram of a community-level microgrid system disclosed in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a household nano-grid system and a community-level micro-grid system, which are used for improving the energy utilization rate when new energy is adopted to supply power to household appliances.
Referring to fig. 2, an embodiment of the present invention discloses a structural schematic diagram of a home network access system, including:
the system comprises new energy electric equipment 11, a new energy power generation system 12, a bidirectional DC/DC (namely a bidirectional direct current converter) 13 and an energy storage battery 14;
wherein,
the new energy electric device 11 has a dc bus that can be connected to the household appliance 10 and can supply power to the household appliance 10.
The new energy power generation system 12 is connected with the new energy electric equipment 11 and is used for providing electric energy for the new energy electric equipment 11.
It should be noted that the dc bus of the new energy electrical device 11 can be directly connected to the dc current drive of the new energy, and compared with the conventional dc-ac-dc bus, an inverter can be omitted.
The energy storage battery 14 is charged and discharged through the bidirectional DC/DC13 to the DC bus under the control of the bidirectional DC/DC 13.
When the electric energy generated by the new energy power generation system 12 can meet the power consumption requirement of the household appliance 10 and is surplus, the new energy power generation system 12 preferentially charges the energy storage battery 14 through the bidirectional DC/DC13, and is connected with an alternating current power grid through DC/AC (direct current-alternating current converter) inversion after being fully charged; when the electric energy generated by the new energy power generation system 12 cannot meet the power consumption requirement of the household appliance 10, the energy storage battery 14 supplies power to the household appliance 10, and when the SOC (state of charge) of the energy storage battery 14 is lower than a preset threshold, the energy storage battery 14 is protected from being damaged, and at this time, the alternating current power grid supplies power to the household appliance 10.
In summary, the dc bus of the new energy electrical device 11 can be directly connected to the dc power drive of the new energy power generation system 12, and compared with the conventional method, the current inversion process is omitted. Therefore, compared with the direct current bus power supply of the new energy electric equipment 11, the household appliance 10 directly adopts the new energy power generation system 12 to supply power, and can save multiple times of conversion, thereby improving the energy utilization rate.
At present, most of household appliances in the market are supplied with power by a direct-current power supply, the direct-current bus in the application is adopted to directly supply power to the household appliances 10, and a rectifying circuit inside the household appliances 10 can be omitted, so that the energy utilization rate is improved by reducing the conversion, and meanwhile, the rectifying circuit cost can be saved for the household appliances 10.
Preferably, the new energy electric equipment 11 is a photovoltaic air conditioner, and the new energy power generation system 12 is a photovoltaic power generation system.
The new energy power generation system 12 is connected to the new energy electric equipment 11 through a dc bus.
It should be noted that, when the voltage level of the dc bus is suitable for the household appliance 10, the household appliance 10 is directly connected to the dc bus; when the voltage level of the DC bus is not suitable for the household appliance 10, the household appliance 10 is connected to the DC bus by DC/DC.
Therefore, in order to further optimize the above embodiment, referring to fig. 3, a schematic structural diagram of a home network hosting system disclosed by another embodiment of the present invention further includes, on the basis of the embodiment shown in fig. 1: DC/DC 15;
DC/DC15 has an input connected to a DC bus and an output connected to the appliance 10, and DC/DC15 is capable of converting the bus voltage to a voltage level that can be directly utilized by the appliance 10.
In order to further optimize the above embodiment, the method further includes: a charging pile 16 and an automobile storage battery 17;
the automobile storage battery 17 is connected to the alternating current bus through the charging pile 16, and can be charged and discharged under the control of the charging pile 16.
Wherein,
the charging pile 16 is similar to a fuel charger in a gas station, can be fixed on the ground or on the wall, is installed in public buildings (public buildings, shopping malls, public parking lots, etc.) and residential district parking lots or charging stations, and can charge various types of electric vehicles according to different voltage levels. The input end of the charging pile 16 is directly connected with an alternating current network, and the output end of the charging pile is provided with a charging plug for charging the electric automobile.
Therefore, when the SOC of the energy storage battery 14 is lower than the preset threshold, the automobile storage battery 17 can be used as a supplement for the energy storage battery 14 to continue to supply power to the household appliance 10, so that the power supply reliability of the household network receiving system can be further improved.
It should be noted that the supplementary battery includes, but is not limited to, the vehicle battery 17.
The independent household network receiving system is generally connected with a single energy storage battery 14, and the capacity of the energy storage battery 14 is small, so that the long-time independent operation of the household network receiving system cannot be met. Aiming at the defect, the invention also provides a community-level micro-grid system.
Referring to fig. 4, a schematic structural diagram of a community-level microgrid system disclosed in an embodiment of the present invention includes: a plurality of home network systems (only two are shown in fig. 3, namely, a home network system 31 and a home network system 32), in which the dc bus sides and the ac sides of the new energy electric devices in the respective home network systems are interconnected.
Therefore, the community-level microgrid system provided by the invention has the advantages that a distributed energy storage structure is formed by interconnecting a plurality of household nanowire systems, the energy storage batteries 14 supplement each other, and the total energy storage energy of the community-level microgrid system is increased, so that the important loads in the community-level microgrid system can be ensured to operate independently for a long time.
The direct current bus sides and the alternating current sides of new energy electric equipment in a plurality of household network receiving systems are interconnected to form an alternating current-direct current double-network hybrid micro-grid system, and as a few electric appliances such as rotating electrical machines and other loads in the household electric appliance 10 supply power for alternating current, the alternating current network can be used as a supplement of the direct current network, so that the power supply reliability of the whole micro-grid system is improved.
It should be noted that, in order to improve the economy of the overall operation of the microgrid system, the large number of distributed energy storage batteries 14 preferentially supply power to the household appliances nearby.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A home networking system, comprising:
the system comprises new energy electric equipment and a control system, wherein the new energy electric equipment is provided with a direct current bus which can be connected with a household appliance and can supply power to the household appliance;
the new energy power generation system is connected with the new energy power utilization equipment;
bidirectional DC/DC;
the energy storage battery is connected to the direct current bus through the bidirectional DC/DC and can be charged and discharged under the control of the bidirectional DC/DC.
2. The home networking system according to claim 1, further comprising:
the input end is connected with the direct current bus, the output end is connected with the household appliance, and the bus voltage can be converted into DC/DC of voltage grade which can be directly utilized by the household appliance.
3. The home networking system according to claim 1, further comprising:
charging piles;
through fill electric pile access alternating current bus, and can be in fill the car battery that carries out charge-discharge under electric pile's control.
4. The home networking system according to claim 1, wherein the new energy power generation system is connected to the direct current bus.
5. The home networking system according to claim 1, wherein the new energy electric equipment is a photovoltaic air conditioner.
6. A community-level microgrid system, comprising: the system comprises a plurality of household network receiving systems, wherein direct current bus sides of new energy electric equipment in each household network receiving system are interconnected, and alternating current sides of the new energy electric equipment are interconnected.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510746334.8A CN105262134B (en) | 2015-11-04 | 2015-11-04 | Household nano-network system and community-level micro-grid system |
| PCT/CN2016/103204 WO2017076192A1 (en) | 2015-11-04 | 2016-10-25 | Home nano-network system and community-level microgrid system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510746334.8A CN105262134B (en) | 2015-11-04 | 2015-11-04 | Household nano-network system and community-level micro-grid system |
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| Publication Number | Publication Date |
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| CN105262134A true CN105262134A (en) | 2016-01-20 |
| CN105262134B CN105262134B (en) | 2018-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510746334.8A Active CN105262134B (en) | 2015-11-04 | 2015-11-04 | Household nano-network system and community-level micro-grid system |
Country Status (2)
| Country | Link |
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| CN (1) | CN105262134B (en) |
| WO (1) | WO2017076192A1 (en) |
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| WO2017076192A1 (en) * | 2015-11-04 | 2017-05-11 | 珠海格力电器股份有限公司 | Home nano-network system and community-level microgrid system |
| CN109301824A (en) * | 2018-11-15 | 2019-02-01 | 紫光测控有限公司 | Zero based on the support of double path system power supply disturbs flexible distribution system |
| CN111817342A (en) * | 2020-06-24 | 2020-10-23 | 淮阴工学院 | Intelligent household system powered by solar energy |
| CN112803445A (en) * | 2021-01-13 | 2021-05-14 | 阳光电源股份有限公司 | Wind storage system and control method thereof |
| CN112803480A (en) * | 2021-01-13 | 2021-05-14 | 阳光电源股份有限公司 | Optical storage system and control method thereof |
| CN113423604A (en) * | 2019-05-10 | 2021-09-21 | 宝马股份公司 | Device, method and cable for feeding electrical energy into an energy network based on a mobile energy store |
| CN116826848A (en) * | 2023-08-30 | 2023-09-29 | 大秦数字能源技术股份有限公司 | Energy control method for direct current coupling island system |
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| CN219312538U (en) * | 2023-04-06 | 2023-07-07 | 上海蔚来汽车有限公司 | Charging and changing system |
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| CN105262134B (en) | 2018-09-07 |
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