CN112086957A - High-quality electric energy intelligent distribution system structure of alternating current-direct current hybrid park network based on Internet of things - Google Patents
High-quality electric energy intelligent distribution system structure of alternating current-direct current hybrid park network based on Internet of things Download PDFInfo
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- CN112086957A CN112086957A CN201910513932.9A CN201910513932A CN112086957A CN 112086957 A CN112086957 A CN 112086957A CN 201910513932 A CN201910513932 A CN 201910513932A CN 112086957 A CN112086957 A CN 112086957A
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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
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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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
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/128—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment involving the use of Internet protocol
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Abstract
The invention discloses an intelligent distribution system structure of high-quality electric energy of an AC/DC hybrid park network based on the Internet of things, which can overcome the defect of uncontrollable electric energy flow of the existing park and provide high-quality electric power. The intelligent distribution device for the high-quality electric energy is used as a core, and based on the ubiquitous sensing park alternating current-direct current hybrid network topological structure, standardized interfaces of various voltage levels and electric energy forms can be provided, the voltage and current of each port can be controlled in real time, and the real-time intelligent distribution requirement for the electric energy is met. In addition, the structure can solve the quality problems of electric energy generated by new energy power generation and loads in a park, and stabilize an alternating current bus and user side voltage. The structure can improve the receiving level of the garden distributed energy and the power supply quality of the garden after popularization, and improves the load adaptability and the economy of garden management.
Description
Technical Field
The invention belongs to the field of low-voltage power distribution networks, micro-grids, Internet of things and AC/DC hybrid, and particularly relates to an AC/DC hybrid park network high-quality electric energy intelligent distribution system structure based on the Internet of things.
Background
With the development of new energy technology and the demand of park intellectualization, a large amount of distributed renewable energy sources, energy storage, electric vehicles, controllable loads and the like are accessed into a park. Because the distributed energy power generation has the characteristics of intermittence, randomness, uncontrollable performance and the like, the structure of a power grid and the flow direction of electric energy are gradually changed; the fluctuating nature of energy storage, electric vehicles and controllable loads also presents challenges to the economic operation and management of campus networks. The energy control device based on the power electronic conversion technology can not only provide required electric energy interfaces for a distributed power supply, energy storage equipment, a charging pile and a controllable load in an alternating current-direct current hybrid network system, but also reasonably distribute energy flow of each node in the system and provide high-quality electric power. Therefore, the research on the structure of the high-quality intelligent electric energy distribution system applicable to the AC/DC hybrid park network has important theoretical and practical significance. Aiming at the novel energy characteristics and the load characteristics of the park, how to improve the reasonable distribution and utilization efficiency of new energy, reduce the influence of the fluctuation of the new energy on the electric energy quality of the park alternating current and direct current hybrid network, improve the park management economic benefit and are the main targets of technical personnel.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an intelligent distribution system structure of high-quality electric energy of an AC/DC hybrid park network based on the Internet of things, realizes the ubiquitous sense, information panorama and intelligent control of the park AC/DC hybrid network system, improves the energy utilization efficiency of the park, and provides high-quality electric power for the park.
One technical scheme for achieving the above purpose is as follows: the utility model provides a high-quality electric energy intelligent distribution system structure of mixed garden network of alternating current-direct current based on thing networking, includes interchange microgrid, direct current microgrid, high-quality electric energy intelligent distribution device, the ubiquitous perception thing of garden networking system and distribution network. The AC micro-grid and the DC micro-grid are connected with a high-quality electric energy intelligent distribution device to form a park AC/DC hybrid network, and the park AC/DC hybrid network is connected with the low-voltage side of a distribution network area; each unit controller in the micro-grid is connected to a perception concentrator, the perception concentrator is connected to a campus autonomous terminal, the campus autonomous terminal is connected to a campus energy management platform so as to form a campus ubiquitous perception Internet of things, and the campus ubiquitous perception Internet of things is connected with a distribution network edge Internet of things terminal; the park alternating current and direct current hybrid network and the park ubiquitous sensing Internet of things jointly form an alternating current and direct current hybrid park network high-quality electric energy intelligent distribution system based on the Internet of things.
The microgrid comprises an energy storage unit, a distributed power supply unit, a charging pile unit, an alternating current load unit and alternating current and direct current universal interfaces, and the access of alternating current and direct current distributed power generation, energy storage, load and electric energy branches thereof is met.
The high-quality electric energy intelligent distribution device functionally comprises an alternating current interface, a direct current interface, a high-quality electric power compensation interface and an expansion interface. The alternating current interface is connected with a low-voltage alternating current bus of the distribution station area; the direct current interface is connected with a park direct current bus; the electric energy quality interface is connected with an AC bus of the AC-DC hybrid network of the park; the expansion interface is used for interface expansion of other distributed power generation, energy storage and controllable loads.
The high-quality electric energy intelligent distribution device comprises a bidirectional rectification link, a direct current isolation link, a bidirectional inversion link, an electric energy quality control conversion link and a multi-port direct current conversion link. The bidirectional rectification link and the bidirectional inversion link are respectively connected with an AC bus of the park network and are used for realizing energy conversion among AC lines in the park network; the direct current isolation link is used for realizing isolation type bidirectional DC/DC conversion and voltage conversion; the expanded multi-port direct current conversion link is used for providing low-voltage direct current interfaces with different voltage levels; the electric energy quality conversion link is connected with the park network alternating current bus and is used for flexibly dealing with and processing the electric energy quality problem generated by the random fluctuation of power generation equipment and load in the park alternating current circuit and improving the voltage and frequency stabilization capacity on the park low-voltage bus.
The ubiquitous sensing Internet of things system comprises each unit controller in a micro-grid, a sensing concentrator, a park autonomous terminal, an edge Internet of things gateway and a park energy management platform.
The intelligent distribution system structure of the high-quality electric energy of the AC/DC hybrid park network based on the Internet of things can overcome the defect that the energy flow of the existing park power grid is uncontrollable, can provide standardized interfaces in various electric energy forms and can control the voltage and current of each port in real time based on the topological structure of the park AC/DC hybrid network of the high-quality electric energy intelligent distribution device, and achieves intelligent requirements of park energy such as tide scheduling, electric energy quality control, energy management and the like; in addition, the structure can also realize real-time acquisition of park network data, and provide big data support for the operation of the power distribution network. The structure can improve the receiving level of high and new energy in the park after being popularized, and improve the economic benefit and the environmental benefit of park management.
Drawings
FIG. 1 is a schematic structural diagram of an intelligent distribution system for high-quality electric energy of an AC/DC hybrid park network based on the Internet of things;
FIG. 2 is a schematic structural diagram of a high-quality electric energy intelligent distribution device of an AC/DC hybrid park network high-quality electric energy intelligent distribution system structure based on the Internet of things;
fig. 3 is a schematic diagram of a ubiquitous sensing internet of things structure of an intelligent distribution system structure of high-quality electric energy of an alternating current-direct current hybrid park network based on the internet of things.
Detailed Description
In order that the technical solution of the invention can be better understood, the following detailed description is given by way of specific embodiments in conjunction with the accompanying drawings:
referring to fig. 1, an intelligent distribution system structure for high-quality electric energy of an ac/dc hybrid park network based on the internet of things comprises a park ac/dc hybrid network 1, an intelligent distribution device 10 for high-quality electric energy, a ubiquitous sensing internet of things network 2 and a power distribution network 4.
The park alternating current and direct current hybrid network 1 comprises alternating current micro-grids 11 and 12 and a direct current micro-grid 13. The ac micro-grids 11, 12 and the dc micro-grid 13 are not only energy loads, but also important park energy supply sources, including wind power generation, photovoltaic power generation, energy storage, charging piles, and the like.
Any one micro-grid is connected and combined with a high-quality intelligent electric energy distribution device 10 to form a park alternating current and direct current hybrid network 1 for supporting the flow of park electric energy; each unit controller of the alternating current microgrid 11 is connected with a perception concentrator 22, each unit controller of the alternating current microgrid 12 is connected with a perception concentrator 24, each unit controller of the direct current microgrid 13 is connected with a perception concentrator 23, and the perception concentrators 22 and 23 are connected with a park autonomous terminal 21; the park autonomous terminal 21 receives information from the sensing concentrator 22, the high-quality electric energy intelligent distribution device control unit 101 and the edge Internet of things gateway 40 and is connected with the park energy management platform 20; the park autonomous terminal 25 receives information from the sensing concentrator 24, the high-quality electric energy intelligent distribution device control unit 101 and the edge internet of things gateway 41 and is connected with the park energy management platform 20; all the components jointly form an internet-of-things system 2, so that ubiquitous perception of the park alternating current and direct current hybrid network 1 is realized; the park alternating current and direct current hybrid network 1 and the ubiquitous sensing Internet of things network system 2 jointly form an alternating current and direct current hybrid park network high-quality electric energy intelligent distribution system 3 based on the Internet of things, so that the full consumption and intelligent distribution of electric energy in a park are realized, and the high-quality power supply cooperative management of the park is realized; the system 3 is connected to a distribution network 4.
Referring to fig. 2, the high-quality intelligent distribution device for electric energy can monitor data in real time according to the flow condition of the park energy and the quality of the electric energy, and is adapted to the input, output, conversion and storage of different energy carriers, so that the park electric energy is of the best quality. The high-quality intelligent electric energy distribution device comprises bidirectional alternating current-direct current converters 51 and 52, a bidirectional direct current converter 53, an electric energy quality converter 54 and an expanded bidirectional direct current converter 55. The alternating current side of the bidirectional alternating current-direct current converter 51 is connected with a park alternating current bus, and the direct current side of the bidirectional alternating current-direct current converter 51 is connected with a bidirectional direct current converter 53; the alternating current side of the bidirectional alternating current-direct current converter 52 is connected with a park alternating current bus, and the direct current side of the bidirectional alternating current converter 52 is connected with a bidirectional direct current converter 53; the direct current side of the power quality converter 54 is connected with the bidirectional direct current converter 53, and the alternating current side of the power quality converter 54 is connected with the alternating current micro-grids 11 and 12; one end of the extended bidirectional dc converter 55 is connected to the bidirectional dc converter 53, and the other end is used as a reserved port.
In specific application, based on the law of economic operation of a transformer area, when the energy supply of distributed energy in the alternating current micro-grid 11 or 12 in a park exceeds the load power, under the condition that the operation of electric energy is optimized and reasonably flows, the electric energy is controlled to flow in the alternating current micro-grid 11 or 12 and the direct current micro-grid 13, so that the electric energy with proper quantity flows to proper loads, and the electric energy which is sent to a power distribution network in a reverse mode is reduced; when the controller 101 of the high-quality intelligent electric energy distribution device 10 detects that the quality of electric energy in the alternating- current microgrid 11 or 12 is unqualified, the voltage of the reactive power stabilization park is compensated according to the detected data, harmonic waves are eliminated, and the safety of the electric energy flow is guaranteed through real-time adjustment.
Referring to fig. 3, in the campus ubiquitous sensing internet of things system 2, the ac microgrid controllers 221, 222, 223, and 224 are connected to the sensing concentrator 22, the dc microgrid controller signals 231, 232, 233, and 234 are connected to the sensing concentrator 23, the sensing concentrators 22 and 23 are connected to the campus autonomous terminal 21, and the high-quality intelligent electric energy distribution device controller 101 and the border gateway 40 are connected to the campus energy management platform 20 through the campus autonomous terminal 21.
In specific application, the controller 221 in the alternating current microgrid 11 monitors a distributed power supply, the controller 222 monitors an energy storage unit, the controller 223 monitors a charging pile unit, and the controller 224 monitors a load unit, each monitor controls each unit in the microgrid to normally operate and simultaneously uploads related electric quantity and state quantity information to the sensing concentrator 22, the sensing concentrator 22 collects data, invalid/abnormal data are eliminated, simple real-time response is processed, data fusion and local decision making in a park are supported, wherein the integrated communication mode of the integrated sensing concentrator 22 comprises Bluetooth, WIFI wireless, 3G/4G/5G, ZigBee and the like, and real-time data interaction of the alternating current microgrid is completed. In the dc microgrid sensing network formed by the monitors 231, 232, 233, and 234 and the sensing concentrator 23, the information transmission process and function are implemented as the same as those of the ac microgrid sensing network.
In specific application, for the campus autonomous terminal 21, the campus incoming line condition is interacted in real time with the distribution network edge Internet of things gateway 40, the statistics of the supply/output electric quantity, the line loss and the line loss rate of each node is realized by collecting the monitoring power outlet data of the monitoring power outlet, namely the campus incoming line data, and combining the data interacted with the sensing concentrators 22 and 23 and the topological structure of a campus alternating current-direct current network, and abnormal alarm and the like are sent out when the operation of the campus network fluctuates abnormally; the park autonomous terminal 21 monitors the flowing state of electric energy in the park in real time through information interaction with the high-quality electric energy intelligent distribution device controller 101, and uploads the electric energy to the park energy management platform for visual display.
In specific applications, the park energy management platform 20 functions include real-time monitoring of power information consumed by the park, and providing intelligent energy-saving services such as feedback control, energy consumption optimization, decision support and the like, and can lay a foundation for intelligent interaction with a park alternating current/direct current hybrid network.
In a specific application, the edge agent terminal 40 performs information interaction with the park energy autonomous terminal 21, and the edge agent terminal 41 performs information interaction with the park energy autonomous terminal 25, so that intelligent control of power flow between the park and the power distribution network is realized.
By the scheme, the distributed energy sources have high power generation power in the daytime, the physical signs of the power flow can be solved by monitoring the electric energy of the alternating current micro-grids 11 and 12 and the direct current micro-grid 13, the flow of the energy in the park alternating current and direct current hybrid network can be controlled by the high-quality energy distributor 10, and the electric energy transmitted to the power distribution network 4 is reduced; the method comprises the steps that the data of the power quality in the park alternating current-direct current hybrid network 1 are intelligently monitored, and low voltage, harmonic waves, temporary calls and the like are intelligently adjusted according to the power quality disturbance characteristics; the perception concentrators 22, 23 and 24 can adapt to the difference of communication modes of all control units in the micro-grid by integrating Bluetooth, WIFI wireless, 3G/4G/5G, ZigBee and the like; through the interaction of the park autonomous terminals 21 and 25 with the sensing concentrators 22 and 24 and the high-quality intelligent power distribution device 10, an alarm is timely generated when the power grid is in abnormal motion, and corresponding measures are taken, so that the safety of the power grid is guaranteed. The system of the invention has the advantages of reasonable structural design, simple implementation, ubiquitous sensing, intelligent control, high-quality power supply, full energy utilization and wide popularization and application.
The above embodiments are merely illustrative, and not restrictive, and any modifications, equivalents, improvements, etc., which fall within the true spirit of the present invention, may be made to the above embodiments.
Claims (4)
1. The utility model provides a high-quality electric energy intelligent distribution system structure of mixed garden network of alternating current-direct current based on thing networking, includes that exchange little electric wire netting, direct current little electric wire netting, high-quality electric energy intelligent distribution device, garden are ubiquitous perception thing networking systems and distribution network, its characterized in that:
the AC micro-grid and the DC micro-grid are connected with a high-quality electric energy intelligent distribution device to form a park AC/DC hybrid network, and the park AC/DC hybrid network is connected with the low-voltage side of a distribution network area; each unit controller in the micro-grid is connected with a perception concentrator, the perception concentrator is connected with a park autonomous terminal, the park autonomous terminal is connected to a park energy management platform to form a park ubiquitous perception internet of things, and the park ubiquitous perception internet of things is connected with a power distribution network edge internet of things terminal.
2. The Internet of things-based intelligent distribution system structure for high-quality electric energy of the AC-DC hybrid park network according to claim 1, wherein the microgrid comprises an energy storage unit, a distributed power supply unit, a charging pile unit, an AC load unit and AC/DC branches, and the access of the AC/DC distributed power generation, energy storage, load and the electric energy branches is met.
3. The structure of the intelligent distribution system of the high-quality electric energy of the AC-DC hybrid park network based on the Internet of things according to claim 1, wherein the intelligent distribution device of the high-quality electric energy functionally comprises an AC interface, a DC interface, an electric energy quality interface and an expansion interface; the alternating current interface is connected with a low-voltage alternating current bus of the distribution station area; the direct current interface is connected with a park direct current bus; the electric energy quality interface is connected with an alternating current bus of the park alternating current-direct current hybrid network, and the expansion interface is reserved for standby;
the high-quality intelligent electric energy distribution device comprises a bidirectional rectification link, a direct current isolation link, a bidirectional inversion link, an electric energy quality control conversion link and a multi-port direct current conversion link; the bidirectional rectification link and the bidirectional inversion link are respectively connected with an AC bus of the park network and are used for realizing energy conversion among AC lines in the park network; the direct current isolation link is used for realizing isolation type bidirectional DC/DC conversion and voltage conversion; the expanded multi-port direct current conversion link is used for providing low-voltage alternating current and direct current interfaces with different voltage grades; the electric energy quality conversion link is connected with the park network alternating current bus and is used for flexibly dealing with and processing the electric energy quality problem generated by the random fluctuation of power generation equipment and load in the park alternating current circuit and improving the voltage and frequency stabilization capacity on the park low-voltage bus.
4. The structure of the intelligent distribution system for the high-quality electric energy of the AC-DC hybrid park network based on the Internet of things according to claim 1 is characterized in that the ubiquitous sensing Internet of things system comprises each unit controller in a micro-grid, a sensing concentrator, a park autonomous terminal, an edge Internet of things gateway and a park energy management platform.
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| WO2015014249A1 (en) * | 2013-07-29 | 2015-02-05 | 华北电力大学（保定） | New energy-based hybrid bidirectional interactive dc traction power supply system |
| CN108134393A (en) * | 2018-01-29 | 2018-06-08 | 华中科技大学 | A kind of Regional Energy interconnection distribution network system based on electric energy route technology |
| CN109038539A (en) * | 2017-06-09 | 2018-12-18 | 天津大学（青岛）海洋工程研究院有限公司 | A kind of alternating current-direct current mixing micro-capacitance sensor topology design method based on energy router |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015014249A1 (en) * | 2013-07-29 | 2015-02-05 | 华北电力大学（保定） | New energy-based hybrid bidirectional interactive dc traction power supply system |
| CN109038539A (en) * | 2017-06-09 | 2018-12-18 | 天津大学（青岛）海洋工程研究院有限公司 | A kind of alternating current-direct current mixing micro-capacitance sensor topology design method based on energy router |
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