CN110854902A - Micro-grid-connected system applied to urban virtual power plant - Google Patents
Micro-grid-connected system applied to urban virtual power plant Download PDFInfo
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- CN110854902A CN110854902A CN201911029075.1A CN201911029075A CN110854902A CN 110854902 A CN110854902 A CN 110854902A CN 201911029075 A CN201911029075 A CN 201911029075A CN 110854902 A CN110854902 A CN 110854902A
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- 238000004146 energy storage Methods 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims description 21
- 230000007613 environmental effect Effects 0.000 claims description 3
- 230000010485 coping Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
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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
- H02J3/381—Dispersed generators
Abstract
The invention discloses a microgrid grid-connected system applied to an urban virtual power plant, which relates to the technical field of microgrids and comprises the urban virtual power plant, wherein the urban virtual power plant is electrically connected with an external power grid; the micro-grid comprises a distributed power supply, an energy conversion device, an energy storage device, a protection device and a controllable load, the urban virtual power plant carries out overall coordination and scheduling control on each micro-grid according to a power grid command of an external power grid, and the power potential of the micro-grid is effectively predicted through the prediction module, so that the overall planning capacity of the urban virtual power plant on each micro-grid is improved, and the coping auxiliary capacity of the urban virtual power plant on a power system is improved.
Description
Technical Field
The invention relates to the technical field of micro-grids, in particular to a micro-grid connection system applied to an urban virtual power plant.
Background
The micro-grid is a small power generation and distribution system composed of a distributed power supply, an energy storage device, an energy conversion device, a load, a monitoring and protection device and the like, is an autonomous system capable of realizing self control, protection and management, and can be operated in a grid-connected mode with an external power grid or in an isolated mode. The micro-grid aims to realize flexible and efficient application of distributed power supplies and solve the problem of grid connection of the distributed power supplies with large quantity and various forms, but in the prior art, the micro-grid takes local application of the distributed power supplies and users as a main control target, and has certain limitations on effective utilization of multi-region and large-scale distributed power supplies and large-scale benefits in the power market due to the limitation of geographical regions.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a microgrid grid-connected system applied to an urban virtual power plant, which can realize the effective utilization of multi-region and large-scale distributed power supplies and realize large-scale benefits in the power market.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows: the utility model provides a little grid-connected system for in virtual power plant of city, including the virtual power plant of city, wherein:
the urban virtual power plant is electrically connected with an external power grid, and the external power grid is electrically connected with a user load;
the urban virtual power plant is electrically connected with a plurality of grid-connected switches, and each grid-connected switch is electrically connected with a corresponding micro-grid;
the micro-grid comprises a distributed power supply, an energy conversion device, an energy storage device, a protection device and a controllable load;
virtual power plant of city carries out overall planning coordination and dispatch control to each little electric wire netting according to the electric wire netting order of outside electric wire netting, further electric connection has intelligent metering module, monitoring module and prediction module between virtual power plant of city and the little electric wire netting, the prediction module includes future trouble prediction module, external information module and analysis module.
Preferably, the smart metering module is electrically connected to a distributed power supply, an energy storage device and a controllable load in the microgrid, and is used for performing information acquisition and working state control on the distributed power supply, the energy storage device and the controllable load.
Preferably, the microgrid grid-connected system applied to the urban virtual power plant is characterized in that a protection device is connected to each of the distributed power sources, the energy conversion devices, the energy storage devices, the protection devices and the controllable loads, and the protection devices are used for electrical protection.
Preferably, the microgrid grid-connected system applied to the urban virtual power plant is characterized in that the monitoring module is electrically connected with the protection device and used for collecting information of the protection device; the monitoring module is electrically connected with the grid-connected switch and used for carrying out information acquisition and working state control on the grid-connected switch.
Preferably, the microgrid grid-connected system applied to the urban virtual power plant is characterized in that the future fault prediction module is electrically connected with the monitoring module and used for collecting information of the monitoring module.
Preferably, the microgrid grid-connected system applied to the urban virtual power plant is characterized in that the external information module is electrically connected with an external information base, and acquires environmental information and resource information from the external information base.
Preferably, the microgrid merging system applied to the urban virtual power plant is characterized in that the analysis module is used for receiving information collected by the future fault prediction module and the external information module and analyzing the information.
Preferably, the microgrid merging system applied to the urban virtual power plant is characterized in that the analysis module is electrically connected with the urban virtual power plant and used for transmitting an analysis result to the urban virtual power plant.
The embodiment of the invention has the following beneficial effects:
according to the microgrid grid-connected system applied to the urban virtual power plant, the urban virtual power plant is used for planning all the microgrids, so that the limitation of effective utilization of the microgrids in a multi-region large-scale distributed power supply is solved, and the combination of the plurality of microgrids enables the frequency modulation and peak shaving capacity of the urban virtual power plant on the power system to be remarkably improved;
in the invention, the electric potential of the micro-grid is effectively estimated through the estimation module, so that the overall planning capacity of the urban virtual power plant to each micro-grid can be improved, and the coping auxiliary capacity of the urban virtual power plant to the electric power system can be improved.
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 it is within the scope of the present invention for a person skilled in the art to obtain other drawings based on the drawings without paying creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a microgrid grid-connected system applied to an urban virtual power plant according to the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of a microgrid grid-connected system applied to a virtual power plant in a city according to the present invention;
fig. 3 is a schematic diagram of the structure of the prediction module in fig. 2 and a schematic diagram of the connection between the prediction module and the monitoring module and between the prediction module and the grid-connected switch.
In the figure: the system comprises a city virtual power plant 1, a grid-connected switch 2, a micro-grid 3, a distributed power supply 4, an energy conversion device 5, an energy storage device 6, a protection device 7, a controllable load 8, a user load 9, an intelligent metering module 10, a monitoring module 11, a prediction module 12, a fault prediction module 121, an external information module 122, an analysis module 123 and an external power grid 13.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, a schematic structural diagram of an embodiment of a microgrid grid-connected system applied to an urban virtual power plant according to the present invention is shown; referring to fig. 1-3, a microgrid grid-connected system applied to an urban virtual power plant includes an urban virtual power plant 1, the urban virtual power plant 1 is electrically connected with an external power grid 13, the external power grid 13 is electrically connected with a user load 9, the urban virtual power plant 1 is electrically connected with a plurality of grid-connected switches 2, and the grid-connected switches 2 are all electrically connected with corresponding microgrid 3.
When major faults occur in the micro-grid 3, the grid-connected switch 2 automatically disconnects the micro-grid 3 from the urban virtual power plant 1, and automatically electrically connects the urban virtual power plant 1 after the faults are eliminated.
The microgrid 3 comprises a distributed power source 4, an energy conversion device 5, an energy storage device 6, a protection device 7 and a controllable load 8.
The protection device 7 is electrically connected to and protects other components of the microgrid 3.
The urban virtual power plant 1 carries out overall coordination and scheduling control on each micro-grid 3 according to a power grid command of the external power grid 13, so that the limitation of effective utilization of the micro-grids 3 in multiple regions and large-scale distributed power sources 4 is solved, and the combination of the multiple micro-grids 3 obviously improves the frequency and peak regulation capacity of the urban virtual power plant 1 on a power system.
Fig. 2 is a schematic structural diagram illustrating another embodiment of a microgrid grid-connected system applied to an urban virtual power plant according to the present invention; referring to fig. 3 together, in the present embodiment, the difference from the embodiment shown in fig. 1 is that an intelligent metering module 10, a monitoring module 11, and a prediction module 12 are further electrically connected between the urban virtual power plant 1 and the microgrid 3, and the prediction module 12 includes a future failure prediction module 121, an external information module 122, and an analysis module 123.
The intelligent metering module 10 is electrically connected with the distributed power source 4, the energy storage device 6 and the controllable load 8 in the microgrid 3, and performs information acquisition and working state control on the distributed power source 4, the energy storage device 6 and the controllable load, so that the power generation and distribution of the microgrid 3 by the urban virtual power plant 1 are controlled.
The monitoring module 11 is electrically connected with the protection device 7 and used for collecting information, the monitoring module 11 is electrically connected with the grid-connected switch 2 and used for collecting information and controlling the working state of the grid-connected switch 2, when a local fault occurs, the protection device 7 is disconnected with a local area, and the monitoring module 11 feeds back the information to the urban virtual power plant 1; when major faults occur to the micro-grid 3, the grid-connected switch 2 disconnects the micro-grid 3, and the monitoring module 11 feeds back the information to the urban virtual power plant 1; after receiving the information, the urban virtual power plant 1 adjusts each microgrid 3, thereby ensuring the operation of the urban virtual power plant.
The failure prediction module 121 is electrically connected to the monitoring module 11 and performs information acquisition thereon; the external information module 122 is electrically connected to an external information base, and acquires environmental information and resource information from the external information base; the analysis module 123 is configured to receive information collected by the future failure prediction module 121 and the external information module 122, and analyze the information.
To understand the present invention, the working principle of the present invention is described as follows:
when the system is used, the urban virtual power plant 1 carries out overall coordination and scheduling control on each microgrid 3 according to a power grid command of the external power grid 13, the analysis module 123 transmits an analysis result to the urban virtual power plant 1, and the prediction module 12 effectively predicts the power potential of the microgrid 3, so that the overall planning of each microgrid 3 by the urban virtual power plant 1 is powerfully supported, and the coping auxiliary capacity of the urban virtual power plant 1 on the power system is further improved.
When the local part of the micro-grid 3 fails, the protection device 7 disconnects the local area, and the monitoring module 11 feeds back the information to the urban virtual power plant 1; when major faults occur to the micro-grid 3, the grid-connected switch 2 disconnects the micro-grid 3, and the monitoring module 11 feeds back the information to the urban virtual power plant 1; the urban virtual power plant 1 receives the information and then adjusts each micro-grid 3, thereby ensuring the operation of the urban virtual power plant.
The embodiment of the invention has the following beneficial effects:
according to the microgrid grid-connected system applied to the urban virtual power plant, the urban virtual power plant is used for planning all the microgrids, so that the limitation of effective utilization of the microgrids in a multi-region large-scale distributed power supply is solved, and the combination of the plurality of microgrids enables the frequency modulation and peak shaving capacity of the urban virtual power plant on the power system to be remarkably improved;
in the invention, the electric potential of the micro-grid is effectively estimated through the estimation module, so that the overall planning capacity of the urban virtual power plant to each micro-grid can be improved, and the coping auxiliary capacity of the urban virtual power plant to the electric power system can be improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent substitutions or changes according to the technical solution and the inventive concept of the present invention should be covered by the scope of the present invention.
Claims (8)
1. A microgrid grid-connected system applied to an urban virtual power plant comprises the urban virtual power plant (1), and is characterized in that:
the urban virtual power plant (1) is electrically connected with an external power grid (13), and the external power grid (13) is electrically connected with a user load (9);
the urban virtual power plant (1) is electrically connected with a plurality of grid-connected switches (2), and each grid-connected switch (2) is electrically connected with a corresponding micro-grid (3);
the micro-grid (3) comprises a distributed power supply (4), an energy conversion device (5), an energy storage device (6), a protection device (7) and a controllable load (8);
virtual power plant in city (1) carries out overall coordination and dispatch control to each little electric wire netting (3) according to the electric wire netting order of outside electric wire netting (13), further electric connection has intelligent metering module (10), monitoring module (11) and prediction module (12) between virtual power plant in city (1) and little electric wire netting (3), prediction module (12) are including future trouble prediction module (121), external information module (122) and analysis module (123).
2. The microgrid grid-connected system applied to an urban virtual power plant according to claim 1, wherein the smart metering module (10) is electrically connected with a distributed power source (4), an energy storage device (6) and a controllable load (8) in a microgrid (3) and is used for performing information acquisition and working state control on the distributed power source (4), the energy storage device (6) and the controllable load (8).
3. The microgrid grid-connected system applied to an urban virtual power plant according to claim 2, characterized in that a protection device (7) is connected to each of the distributed power sources (4), the energy conversion devices (5), the energy storage devices (6), the protection devices (7) and the controllable loads (8), and the protection devices (7) are used for electrical protection.
4. The microgrid grid-connected system applied to an urban virtual power plant according to claim 3, characterized in that the monitoring module (11) is electrically connected with the protection device (7) and is used for collecting information of the protection device (7); the monitoring module (11) is electrically connected with the grid-connected switch (2) and is used for carrying out information acquisition and working state control on the grid-connected switch (2).
5. The microgrid grid-connected system applied to an urban virtual power plant according to any one of claims 1 to 4, characterized in that the future fault prediction module (121) is electrically connected with the monitoring module (11) and performs information collection on the monitoring module.
6. The microgrid grid-connected system applied to an urban virtual power plant according to claim 5, characterized in that the external information module (122) is electrically connected with an external information base, and acquires environmental information and resource information from the external information base.
7. The microgrid grid-connected system applied to the urban virtual power plant according to claim 6, wherein the analysis module (123) is used for receiving information collected by the future fault prediction module (121) and the external information module (122) and analyzing the information.
8. The microgrid grid-connected system applied to the urban virtual power plant according to claim 7, characterized in that the analysis module (123) is electrically connected with the urban virtual power plant (1) and is used for transmitting the analysis result to the urban virtual power plant (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911029075.1A CN110854902B (en) | 2019-10-28 | Micro-grid-connected system applied to urban virtual power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911029075.1A CN110854902B (en) | 2019-10-28 | Micro-grid-connected system applied to urban virtual power plant |
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| CN110854902A true CN110854902A (en) | 2020-02-28 |
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| US20090072624A1 (en) * | 2004-11-30 | 2009-03-19 | Secured Digital Storage, Llc | Green Data Center And Virtual Power Plant |
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| CN108616114A (en) * | 2018-05-16 | 2018-10-02 | 国网山东省电力公司电力科学研究院 | A kind of power distribution network distributed layer protection system and method for the group containing microgrid |
| CN109768571A (en) * | 2018-12-30 | 2019-05-17 | 国网河南省电力公司滑县供电公司 | A kind of grid-connected micro grid control system and method |
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090072624A1 (en) * | 2004-11-30 | 2009-03-19 | Secured Digital Storage, Llc | Green Data Center And Virtual Power Plant |
| CN104283308A (en) * | 2013-07-10 | 2015-01-14 | 北京中电建投微电网科技有限公司 | Smart central strategy control system for micro-grid |
| CN205846731U (en) * | 2016-07-20 | 2016-12-28 | 锐电科技有限公司 | A kind of system improving virtual plant voltage stability based on wind accumulation |
| CN108037667A (en) * | 2017-12-15 | 2018-05-15 | 江苏欣云昌电气科技有限公司 | Base station electric energy optimizing dispatching method based on virtual plant |
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