CN105552878B - DC micro-grid structure - Google Patents
DC micro-grid structure Download PDFInfo
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- CN105552878B CN105552878B CN201510996135.2A CN201510996135A CN105552878B CN 105552878 B CN105552878 B CN 105552878B CN 201510996135 A CN201510996135 A CN 201510996135A CN 105552878 B CN105552878 B CN 105552878B
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- 230000002457 bidirectional effect Effects 0.000 claims abstract description 17
- 238000004146 energy storage Methods 0.000 claims description 50
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000013589 supplement Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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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
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The embodiment of the invention discloses a direct current micro-grid structure, which utilizes an open direct current bus of a frequency converter of electrical equipment to be directly connected with a photovoltaic and other distributed power supplies, and the direct current micro-grid can be directly connected with a commercial power grid through an onboard frequency converter of the electrical equipment, so that the direct current micro-grid can be connected with the commercial power without an additional DC/AC converter. Moreover, the three nodes of the electrical equipment, the charging pile and the bidirectional DC/DC can form a ring network, each node is provided with two power supply points, if one side of the node is subjected to line fault maintenance and the like, the other side of the node can continue to supply power to the node, and compared with the structure of the traditional direct-current micro-grid, the direct-current micro-grid has higher power supply reliability.
Description
Technical Field
The invention relates to the technical field of micro-grids, in particular to a household direct-current micro-grid structure.
Background
At present, a typical structure of a household direct-current microgrid is shown in fig. 1, all distributed micro power supplies (such as direct-current micro power supplies including photovoltaic power supplies and the like, alternating-current micro power supplies including wind power supplies and the like, and loads and the like are connected to a mains supply network through power electronic conversion devices (such as a DC/DC converter, an AC/DC converter, a DC/AC converter and the like) and the direct-current microgrid is connected to the mains supply network through an inverter device, so that the household direct-current microgrid can be connected to the mains supply network for operation and can also be. The direct current micro-grid can provide electric energy for alternating current and direct current loads with different voltage grades through the power electronic conversion device.
In the process of implementing the invention, the inventor finds that the implementation cost of the direct-current microgrid structure is high.
Disclosure of Invention
The invention aims to provide a direct-current micro-grid structure so as to reduce the implementation cost of the direct-current micro-grid structure.
In order to achieve the purpose, the invention provides the following technical scheme:
a direct current microgrid structure comprising:
an electrical device including an AC/DC converter, and a DC/AC converter connected to the AC/DC converter through a direct current bus;
the micro power supply is connected to the direct current bus through a power electronic conversion device;
the charging pile is connected with the alternating current input end of the AC/DC converter, the AC/DC converter and the public end of the charging pile are connected with a commercial power network, and the output end of the charging pile is used for being electrically connected with a first type of energy storage device;
the bidirectional DC/DC converter and the unidirectional DC/DC converter are respectively connected to a direct current bus of the electrical equipment;
the output end of the charging pile is connected with the output end of the bidirectional DC/DC converter through a switch, and the output end of the bidirectional DC/DC converter is also used for being connected with a second type of energy storage device.
In the above dc microgrid structure, preferably, the electrical equipment includes: provided is a photovoltaic air conditioner.
Above-mentioned little electric wire netting structure of direct current, it is preferred, it is used for the electric pile that fills that is used for charging for the on-vehicle storage battery of electric automobile to fill electric pile.
In the above dc microgrid structure, preferably, the microgrid source includes: a photovoltaic cell group;
the photovoltaic battery pack is connected to the direct current bus through a unidirectional DC/DC converter.
In the above dc microgrid structure, preferably, the microgrid source includes: a small wind turbine;
the small wind turbine generator is connected to the direct current bus through a unidirectional AC/DC converter.
In the above DC microgrid structure, preferably, the output end of the bidirectional DC/DC converter is specifically used for connecting with a household storage battery pack.
The above-mentioned direct current microgrid structure preferably further includes:
the energy management and control system is used for managing and controlling the electric energy of the commercial power, the electric energy of the micro power supply and the electric energy of the energy storage device; the energy storage devices comprise a first type of energy storage device and a second type of energy storage device.
According to the scheme, the utility model provides a direct current microgrid structure utilizes the open direct current generating line of the converter of electrical equipment, directly inserts the distributed power such as photovoltaic, and the direct current microgrid can directly insert commercial power electric wire netting through electrical equipment's machine-mounted converter to direct current microgrid does not need extra DC AC converter just can be incorporated into the power networks with the commercial power, compares with traditional direct current microgrid structure, sparingly incorporated into the power networks inverter, has reduced the cost of realization. Moreover, the three nodes of the electrical equipment, the charging pile and the bidirectional DC/DC can form a ring network, each node is provided with two power supply points, if one side of the node is subjected to line fault maintenance and the like, the other side of the node can continue to supply power to the node, and compared with the structure of the traditional direct-current micro-grid, the direct-current micro-grid has higher power supply reliability.
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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a typical structure of a household DC microgrid in the prior art;
fig. 2 is a schematic diagram of a dc microgrid structure according to an embodiment of the present application;
fig. 3 is a schematic view of a ring topology of a dc microgrid provided in an embodiment of the present application.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated herein.
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 obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 2, fig. 2 is a schematic diagram of a dc microgrid structure according to an embodiment of the present application, wherein a dotted line represents an ac path, and a solid line represents a dc path, the dc microgrid structure according to the embodiment of the present application may include:
an electric device 11, a micro power source 12, a charging pile 13, a bidirectional DC/DC converter 14 and a unidirectional DC/DC converter 15; wherein,
the electric appliance 11 includes an AC/DC converter 111, a DC/AC converter 112, and the AC/DC converter 111 and the DC/AC converter 112 are electrically connected by a direct current bus.
The electrical device may be an electrical device with a AC-DC-AC frequency converter, which typically comprises an AC/DC converter, a DC/AC converter and a DC bus connecting the two.
The AC/DC converter 111 is a bidirectional AC/DC converter.
The micro power source 12 is connected to the dc bus through a power electronic converter.
One or more micro power supplies 12 may be provided, and may include: photovoltaic battery pack, small wind turbine generator. Micro gas turbines and the like may also be included.
The power electronic converter used to access the dc bus is different according to the type of electric energy output by the micro power supply 12.
If the micro power supply 12 outputs AC power, the micro power supply 12 is connected to the DC bus through a unidirectional AC/DC converter.
If the micro power supply 12 outputs a direct current, the micro power supply 12 is connected to the direct current bus through a unidirectional DC/DC converter.
The charging pile 13 is connected with an alternating current input end of the AC/DC converter 111, a public end of the charging pile 13 and the AC/DC converter 111 is connected with a commercial power network, and an output end of the charging pile 13 is used for being electrically connected with the first type of energy storage device, namely the charging pile 13 is used for charging the first type of energy storage device.
In this embodiment, the utility power network outputs electric energy which can supply power to the electrical equipment 11, and can also supply power to the rotating electrical machine type load which can not be supplied with direct current by charging the first type energy storage device through the charging pile.
The bidirectional DC/DC converter 14 and the unidirectional DC/DC converter 15 are also connected to the DC bus, respectively.
The output end of the bidirectional DC/DC converter 14 is connected with the output end of the charging pile 13 through a switch K, and the output end of the bidirectional DC/DC converter 14 is also used for being connected with a second type energy storage device.
When the voltage levels of the first type of energy storage device and the second type of energy storage device are equal, the switch K can be closed, so that the first type of energy storage device and the second type of energy storage device are connected in parallel, and the direct current microgrid structure is changed into an annular network structure from an original radial structure. Fig. 3 is a schematic diagram of a ring topology of a dc microgrid according to an embodiment of the present invention.
When above-mentioned switch K closed, the direct current microgrid structure carries out the alternating current-direct current and mixes to filling first type energy memory and second type energy memory simultaneously, and first type energy memory and second type energy memory both can utilize the direct current to charge through two-way DC/DC promptly, can fill electric pile again through the car and use the interchange to charge. The total energy storage capacity is increased compared to charging a single energy storage device.
The electric energy output by the unidirectional DC/DC converter 15 is used as household electricity, i.e. the output end of the unidirectional DC/DC converter 15 is used for connecting household appliances.
According to the direct-current microgrid structure provided by the embodiment of the invention, a photovoltaic and other distributed power supplies are directly connected by using the open direct-current bus of the frequency converter of the electrical equipment, and the direct-current microgrid can be directly connected to a mains supply power grid through the onboard frequency converter of the electrical equipment, so that the direct-current microgrid can be connected with the mains supply without an additional DC/AC converter. Moreover, the three nodes of the electrical equipment, the charging pile and the bidirectional DC/DC can form a ring network, each node is provided with two power supply points, if one side of the node is subjected to line fault maintenance and the like, the other side of the node can continue to supply power to the node, and compared with the structure of the traditional direct-current micro-grid, the direct-current micro-grid has higher power supply reliability.
Alternatively, the electrical device 11 may be a photovoltaic air conditioner including an inverter having an open DC bus to which the AC/DC converter and the DC/AC converter are connected, respectively.
Optionally, the charging pile 13 is a charging pile for charging an electric vehicle-mounted storage battery pack.
Optionally, if the micro power source 12 is a photovoltaic battery pack, the photovoltaic battery pack is connected to the DC bus of the electrical equipment 11 through a unidirectional DC/DC converter.
Optionally, if the micro power supply 12 is a small-sized wind turbine, the small-sized wind turbine is connected to the DC bus in the electrical equipment 11 through the unidirectional AC/DC converter.
Optionally, the output of the bidirectional DC/DC converter is specifically adapted to be connected to a household battery pack. I.e. the second type of energy storage device may be a household battery pack. That is, the energy storage device of the second type stores electric energy for powering the household appliance.
Optionally, the direct-current microgrid structure provided in the embodiment of the present invention may further include:
the energy management and control system is used for managing and controlling the electric energy of the commercial power, the electric energy of the micro power supply and the electric energy of the energy storage device; the energy storage devices comprise a first type of energy storage device and a second type of energy storage device.
Alternatively, the energy management and control system may manage and control the energy by:
when the direct-current microgrid operates normally, the household appliances (including the electrical equipment 11) preferentially use the electric energy output by the micro power source 12, when the electric energy output by the micro power source 12 is insufficient, the electric energy stored by the energy storage device is reused, and when the electric energy stored by the micro power source 12 and the energy storage device is insufficient, the electric energy of the commercial power is reused.
When the electric energy output by the micro power supply 12 is surplus except for the household appliances (including the electric appliance 11), the energy storage device is charged preferentially, and after the energy storage device is full, the electric energy is fed back to the commercial power network.
When the second type of energy storage device is connected to the direct-current microgrid structure, if the electric energy output by the micro power supply 12 is surplus except for household appliances (including the electrical equipment 11), the second type of energy storage device is directly charged; if the electric energy output by the micro power supply 12 is insufficient, the first type energy storage device is used as the supplement of the second type energy storage device to provide electric energy; if the second type of energy storage device is connected to the dc microgrid structure, the electric quantity of the second type of energy storage device is already below the low electric quantity threshold, and the electric energy output by the microgrid 12 is insufficient, at this time, the utility grid directly charges the second type of energy storage device.
The first type of energy storage device is connected to form a ring-shaped power supply network, and is used as a supplement of a household storage battery pack, so that the reliability (namely continuity) of system power supply is further improved.
In addition, the energy management and control system may also select a charging mode according to the peak-to-valley electricity prices, the charging mode including: alternating current charging and direct current charging.
When the electric energy output by the micro power supply 12 is used for household appliances (including the electric appliance 11) and has surplus, whether to charge the energy storage device or to reverse the network according to the peak-valley power price of the commercial power network. Specifically, if the electricity price is near the peak value, the redundant electric energy of the micro power supply 12 is inverted to be on the internet, so that the maximum economic benefit can be obtained, and if the electricity price is near the valley value, the energy storage device is charged preferentially.
When the electric energy output by the micro-power source 12 is not enough to satisfy the load usage (i.e., the electric energy output by the micro-power source 12 is not enough), whether the energy storage device or the utility grid supplies power can be selected according to the peak-to-valley electricity price. Specifically, if the electricity price is near the peak value, the energy storage device is preferentially used for supplying power to the load, and when the capacity of the energy storage device is smaller than a threshold value (namely the electric energy stored by the energy storage device is insufficient), the commercial power network is used for supplying power; if the electricity price is near the valley value, the utility grid can be directly used for supplying power to the load.
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 (7)
1. A direct current microgrid structure, comprising:
an electrical device including an AC/DC converter, and a DC/AC converter connected to the AC/DC converter through a direct current bus;
the micro power supply is connected to the direct current bus through a power electronic conversion device;
the charging pile is connected with the alternating current input end of the AC/DC converter, the AC/DC converter and the public end of the charging pile are connected with a commercial power network, and the output end of the charging pile is used for being electrically connected with a first type of energy storage device;
the bidirectional DC/DC converter and the unidirectional DC/DC converter are respectively connected to a direct current bus of the electrical equipment;
the output end of the charging pile is connected with the output end of the bidirectional DC/DC converter through a switch K, and the output end of the bidirectional DC/DC converter is also used for being connected with a second type of energy storage device;
when the voltage levels of the first type of energy storage device and the second type of energy storage device are equal, the switch K can be closed, so that the first type of energy storage device and the second type of energy storage device are connected in parallel, and the direct-current micro-grid structure is changed into an annular network structure from an original radial structure.
2. The direct current microgrid structure of claim 1, wherein the electrical equipment comprises: provided is a photovoltaic air conditioner.
3. The direct current microgrid structure of claim 1, wherein the charging piles are charging piles for charging onboard storage batteries of electric vehicles.
4. The direct current microgrid structure of claim 1, wherein the microgrid source comprises: a photovoltaic cell group;
the photovoltaic battery pack is connected to the direct current bus through a unidirectional DC/DC converter of the power electronic conversion device.
5. The direct current microgrid structure of claim 1, wherein the microgrid source comprises: a small wind turbine;
the small wind turbine generator is connected to the direct current bus through a unidirectional AC/DC converter of the power electronic conversion device.
6. The direct current microgrid architecture of claim 1, characterized in that the output of the bidirectional DC/DC converter is particularly intended for connection to a household battery pack.
7. The direct current microgrid structure of claim 1, further comprising:
the energy management and control system is used for managing and controlling the electric energy of the commercial power, the electric energy of the micro power supply and the electric energy of the energy storage device; the energy storage devices comprise a first type of energy storage device and a second type of energy storage device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510996135.2A CN105552878B (en) | 2015-12-24 | 2015-12-24 | DC micro-grid structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510996135.2A CN105552878B (en) | 2015-12-24 | 2015-12-24 | DC micro-grid structure |
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| CN105552878A CN105552878A (en) | 2016-05-04 |
| CN105552878B true CN105552878B (en) | 2018-04-20 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026337A (en) * | 2016-05-30 | 2016-10-12 | 广东港博电力科技有限公司 | Environment-friendly charging pile with hybrid electric power generation system |
| CN109149548A (en) * | 2018-07-27 | 2019-01-04 | 珠海格力电器股份有限公司 | Regional energy management method and device and regional power grid |
| CN108964007B (en) | 2018-07-31 | 2020-07-07 | 珠海格力电器股份有限公司 | Direct-current power distribution method, device and system |
| CN109185183B (en) * | 2018-09-20 | 2024-03-12 | 珠海格力电器股份有限公司 | Air supply device |
| CN109149710A (en) * | 2018-09-20 | 2019-01-04 | 珠海格力电器股份有限公司 | Household appliance powered by battery |
| CN110829407A (en) * | 2019-12-13 | 2020-02-21 | 北京新城绿源科技发展有限公司 | Distributed multi-bus direct-current micro-grid system |
| CN113708425A (en) * | 2021-08-24 | 2021-11-26 | 深圳供电局有限公司 | Direct current micro-grid system and intelligent direct current cabinet thereof |
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