CN116780521A - Novel power distribution network frame construction method based on multi-state switch - Google Patents
Novel power distribution network frame construction method based on multi-state switch Download PDFInfo
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- 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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0075—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source according to economic or energy efficiency considerations, e.g. economic dispatch
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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Abstract
The invention relates to a novel power distribution network frame construction method based on a multi-state switch, which is characterized by being safe, reliable, economical, efficient, environment-friendly, low-carbon, high-quality in service, optimized and interactive, and the like, wherein 8 loop lines are collected to form independent feeder line clusters, a stronger energy configuration platform is built, and the novel power distribution network frame construction method has the characteristics of flexible load transfer, high efficiency benefit, adaptation to accommodate more new elements of an energy Internet, and the like. Each feeder line in the snowflake grid structure is reasonably segmented and connected, has the self-healing capability of fault automatic detection, isolation, network reconstruction and power restoration, can meet the power supply requirements of various users, improves the utilization efficiency of power distribution equipment, and has the characteristics of clear structure, flexibility, reliability, coordinated development, economy and high efficiency.
Description
Technical Field
The invention belongs to the technical field of power distribution, and particularly relates to a novel power distribution network frame construction method based on a multi-state switch.
Background
The novel power system presents the general development trend of greenization, flexibility, digitalization and intelligence, the power distribution network is an important component of a power grid, is the last kilometer of a connecting energy end and a user, has the largest change in the power system, and develops towards the directions of activation, co-assimilation, localization and marketization under the new pattern of the energy system. The role of the system is not only a simple electric energy distribution network, but also a digitalized active power distribution system integrated with 'source-network-load-storage', which is an important physical carrier and a basic stone of a novel electric power system, is a resource allocation center in a future comprehensive energy system, and is a trading platform of a multi-benefit main body.
Future grids will exhibit a pattern of large grids and micro-grids coexisting. This feature is mainly determined by the energy distribution, the power supply structure and the structure of the grid itself. On the one hand, the geographical distribution of the power resource and the load center is not matched, but the renewable energy source has good space-time complementarity in a wide area range, and the development of a large power grid with proper scale is necessary. On the power distribution network side, distributed power generation by utilizing resources in situ and regional power grids and micro power grids facing end users are greatly developed, charged automobiles, other energy storage devices and the like are large-scale, a future power distribution system can be divided into a plurality of control areas which independently operate, and virtual power plants, micro power grids and the like with different scales can be connected. Therefore, the renewable energy source is used for generating electricity and is an energy revolution with important characteristics, so that the mode of electric power production and transportation is changed from the traditional intensive production mode to the intensive production mode, the large-scale transportation mode and the distributed production mode, and the mode of on-site supplement is adopted, and a mode of coexistence of a large power grid and a micro power grid is formed.
The operation mode of the traditional power distribution network is mainly based on the dominant one-way radial power supply, and the access of distributed energy sources and electric automobiles is not considered in the planning and design stage and operation management of the power distribution network. With the continuous increase of the access quantity of distributed energy sources, the electric automobile is rapidly popularized, the controllable load is continuously increased, and the existing power distribution network architecture has difficulty in meeting the requirements of users on environmental protection, power supply reliability, electric energy quality and high-quality service. The rapid development and large-scale grid connection of renewable energy sources seriously affect the flexibility of power grid operation, and the intermittence, the variability and the uncertainty of the renewable energy sources bring great challenges to energy systems based on coal and electricity. The current distribution network does not have the technical potential to efficiently integrate a large number of distributed power sources, and a power switching network which accommodates a high proportion of distributed renewable energy sources and is suitable for bidirectional power flow is needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a novel power distribution network frame construction method based on a multi-state switch, which can maintain the stable operation of a power grid, rapidly and accurately give out an optimal load transfer scheme, greatly improve the working efficiency of a dispatcher and ensure the safe and stable operation of the power grid.
The invention solves the technical problems by adopting the following technical scheme:
the utility model provides a novel distribution network rack construction method based on multi-state switch, includes four substations and eight 10kV feeder lines, constitutes snowflake structure distribution network rack for the power supply of power supply area that surrounds, and wherein each substation is qualified for the next round of competitions 2, and each return line has 1 interstation connection looped netowrk node, 1 intra-station connection looped netowrk node, and open-loop operation, looped netowrk node equipment includes looped netowrk case, box change and electricity distribution room; the snowflake-shaped structure power distribution net rack consists of snowflake-shaped basic units, wherein each snowflake-shaped basic unit is provided with 4 in-station connecting nodes and 4 inter-station connecting nodes, and a line segment between the two nodes is a 10kV feeder line; the single power supply equipment is connected in series on one side of the snowflake-shaped basic unit and is powered by a single ring network to form the shape of the snowflake; the double power supply devices are distributed in the snowflake-shaped basic unit, are connected in series on two sides of the snowflake-shaped basic unit, and are powered by two single-ring networks; other devices access the single ring network or access the branch line.
Moreover, the snowflake-shaped basic unit is a basic unit Snow of a medium-voltage mesh power distribution network, and simultaneously Snow epsilon Snow (SDN) forms a snowflake-shaped structure power distribution network frame as follows:
SDN＝(Snow(SDN),R(Snow(SDN)))
Snow(SDN)＝{snow 1 ,snow 2 ,snow 3 ,...,snow n }
R(Snow(SDN))＝{(snow i ,snow j )}
wherein Snow (SDN) is a set of snowflake-like basic units in a snowflake grid,r (SDN) is the association relation between the power supply areas in the snowflake power grid, and each power supply area is mutually connected with each other through a connecting lineThe association satisfies the association relation of R (Snow (SDN)), expressed as a set of ordinal pairs, and n-order symmetric matrix SDNM is used for visually representing the association relation between the basic units of the medium-voltage distribution network, and the element d on the j-th row of the i-th row ij The method comprises the following steps:
moreover, the calculation method of the basic unit snow of the medium-voltage mesh power distribution network comprises the following steps:
snow＝{ssource,sbranch,sload}
wherein, ssource is the power in each snowflake basic unit, and the branch is the branch road in each snowflake basic unit, and the load is in each snowflake basic unit.
The invention has the advantages and positive effects that:
the invention gathers 8 loop lines to form independent feeder line clusters, builds a stronger energy configuration platform, has the characteristics of flexible load transfer, high efficiency benefit, adaptation to accommodate more new elements of the energy Internet, and the like, and has five characteristics of safety, reliability, economy, high efficiency, green low carbon, high service quality, optimization interaction and the like. Each feeder line in the snowflake grid structure is reasonably segmented and connected, has the self-healing capability of fault automatic detection, isolation, network reconstruction and power restoration, can meet the power supply requirements of various users, improves the utilization efficiency of power distribution equipment, and has the characteristics of clear structure, flexibility, reliability, coordinated development, economy and high efficiency.
Drawings
Fig. 1 is a diagram of a network architecture of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A novel power distribution network frame construction method based on a multi-state switch is shown in a figure 1, and comprises four transformer substations and eight 10kV feeder lines, so that a snowflake-shaped structure power distribution network frame is formed and is used for providing power for an enclosed power supply area, wherein each transformer substation is outgoing line for 2 times, each loop line is provided with 1 inter-station connection ring network node, 1 intra-station connection ring network node and open-loop operation, and ring network node equipment comprises a ring network box, a box-type transformer and a power distribution room; the snowflake-shaped structure power distribution net rack consists of snowflake-shaped basic units, wherein each snowflake-shaped basic unit is provided with 4 in-station connecting nodes and 4 inter-station connecting nodes, and a line segment between the two nodes is a 10kV feeder line; the single power supply equipment is connected in series on one side of the snowflake-shaped basic unit and is powered by a single ring network to form the shape of the snowflake; the double power supply devices are distributed in the snowflake-shaped basic unit, are connected in series on two sides of the snowflake-shaped basic unit, and are powered by two single-ring networks; other devices access the single ring network or access the branch line. The snowflake net not only meets the grid planning requirement and realizes the fine planning, but also focuses on the object of the power grid planning construction operation, so that the cooperation of each specialty is easy to realize and the fine management is promoted. The method is independent of new technology and elements, realizes a layered and clustered power grid framework in a segmented connection mode, and is a grid structure for realizing the characteristics of free interconnection of future networks and plug and play of load equipment.
Each power supply area in the snowflake power grid is powered on by a snowflake-shaped structure formed by four substations and eight feeder lines, and all snowflake-shaped basic units are mutually interconnected through connecting lines of inter-station connecting nodes, so that an integral net rack with a plurality of snowflakes mutually interconnected is formed. The snowflake grid is essentially a mesh distribution grid. Each snowflake basic unit is essentially a basic unit Snow of a medium-voltage mesh power distribution network, snow epsilon Snow (SDN), the association relation between each basic unit Snow of the medium-voltage mesh power distribution network and four adjacent units meets R (Snow (SDN)), and the snowflake-shaped structure power distribution network is formed by the following components:
SDN＝(Snow(SDN),R(Snow(SDN)))
Snow(SDN)＝{snow 1 ,snow 2 ,snow 3 ,...,snow n }
R(Snow(SDN))＝{(snow i ,snow j )}
wherein Snow (SDN) is a set of snowflake-like basic units in a snowflake grid,r (Snow (SDN)) is the association relation between power supply areas in a snowflake power grid, each power supply area is mutually interconnected through a connecting line, the association relation of R (Snow (SDN)) is met, the association relation is expressed as a set of sequential pairs, an n-order symmetric matrix SDNM is used for visually representing the association relation between basic units of the medium-voltage power distribution network, and an element d on an ith row and an jth column is visually represented ij The method comprises the following steps:
the calculation method of the basic unit snorow of the medium-voltage mesh power distribution network comprises the following steps:
snow＝{ssource,sbranch,sload}
wherein, ssource is the power in each snowflake basic unit, and the branch is the branch road in each snowflake basic unit, and the slot is the load in each snowflake basic unit, ssource epsilon { mvw }, and the branch epsilon { mvw }, slot epsilon { mvw }.
According to the novel power distribution network frame construction method based on the multi-state switch, the effect of the invention is verified through simulation test:
as shown in fig. 1, a transformer substation a, a transformer substation B, a transformer substation C and a transformer substation D are places for converting voltage and current, receiving electric energy and distributing electric energy in a power system; the red dots represent inter-station connection nodes, the green dots represent intra-station connection nodes, and the ring network node equipment is a distribution place for carrying out electric energy conversion and distribution on ring network boxes, box-type transformer and distribution rooms and the like; the line segments represent 10kV distribution lines and are responsible for connection of distribution equipment and transmission of electric energy; the power supply area is a hexagonal area formed by connecting round dots and line segments and is a ring network unit for providing electric energy for users in jurisdictions; each ring network unit is subjected to regional interconnection through a contact node, the interconnected ring network units share power generation during normal operation, and the power exchange between adjacent balance areas is optimized by utilizing the different time and available low-cost capacity between regional loads, so that the overall operation cost of the interconnected system can be reduced, and the investment of newly-increased power generation capacity can be delayed; when the unit is required to be scheduled to be shut down due to overhaul in a certain ring network unit, peak shaving can be realized through adjustment of scheduled power.
The invention has five characteristics:
1. the safety and reliability aspect, the accident risk resistance and the self-healing ability are strong, and the power supply is stable and reliable.
2. In the aspect of economy and high efficiency, the coordination of power supply reliability and efficiency benefit is realized, and the utilization efficiency of equipment is improved through flexible load transfer.
3. In the aspect of green low carbon, the method is suitable for high-proportion access of diversified loads such as distributed power supplies, energy storage, electric automobiles and the like.
4. In the aspect of high service quality, the method is suitable for new requirements of 'obtaining power' that electricity is saved more time, money is saved more and electricity is used more reliably, and can realize the nearby access of users.
5. In the aspect of optimizing interaction, the method adapts to new demands of energy Internet development, and can realize wide access of various facilities and main bodies such as centralized facilities, distributed facilities and the like.
It should be emphasized that the examples described herein are illustrative rather than limiting, and therefore the invention includes, but is not limited to, the examples described in the detailed description, as other embodiments derived from the technical solutions of the invention by a person skilled in the art are equally within the scope of the invention.
Claims (3)
1. A novel power distribution network frame construction method based on a multi-state switch is characterized by comprising the following steps of: the power distribution network frame comprises four substations and eight 10kV feeder lines, a snowflake-shaped structure power distribution network frame is formed and used for providing power for a surrounding power supply area, wherein each substation is outgoing 2 times, each loop line is provided with 1 inter-station connection loop network node, 1 intra-station connection loop network node, and the loop network node equipment comprises a loop network box, a box-type transformer and a power distribution room; the snowflake-shaped structure power distribution net rack consists of snowflake-shaped basic units, wherein each snowflake-shaped basic unit is provided with 4 in-station connecting nodes and 4 inter-station connecting nodes, and a line segment between the two nodes is a 10kV feeder line; the single power supply equipment is connected in series on one side of the snowflake-shaped basic unit and is powered by a single ring network to form the shape of the snowflake; the double power supply devices are distributed in the snowflake-shaped basic unit, are connected in series on two sides of the snowflake-shaped basic unit, and are powered by two single-ring networks; other devices access the single ring network or access the branch line.
2. The method for constructing the novel power distribution network rack based on the multi-state switch, as claimed in claim 1, is characterized by comprising the following steps: the snowflake-shaped basic unit is a medium-voltage mesh power distribution network basic unit Snow, and the Snow epsilon Snow (SDN) forms a snowflake-shaped structure power distribution network frame which is as follows:
SDN＝(Snow(SDN),R(Snow(SDN)))
Snow(SDN)＝{snow 1 ,snow 2 ,snow 3 ,...,snow n }
R(Snow(SDN))＝{(snow i ,snow j )}
wherein Snow (SDN) is a set of snowflake-like basic units in a snowflake grid,r (Snow (SDN)) is the association relation between power supply areas in a snowflake power grid, each power supply area is mutually interconnected through a connecting line, the association relation of R (Snow (SDN)) is met, the association relation is expressed as a set of sequential pairs, an n-order symmetric matrix SDNM is used for visually representing the association relation between basic units of the medium-voltage power distribution network, and an element d on an ith row and an jth column is visually represented ij The method comprises the following steps:
3. the method for constructing the novel power distribution network rack based on the multi-state switch, as claimed in claim 1, is characterized by comprising the following steps: the calculation method of the basic unit snow of the medium-voltage mesh power distribution network comprises the following steps:
snow＝{ssource,sbranch,sload}
wherein, ssource is the power in each snowflake basic unit, and the branch is the branch road in each snowflake basic unit, and the load is in each snowflake basic unit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117293827A (en) * | 2023-11-27 | 2023-12-26 | 国网天津市电力公司城南供电分公司 | Wiring mode scale configuration method and system integrating snowflake network and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117293827A (en) * | 2023-11-27 | 2023-12-26 | 国网天津市电力公司城南供电分公司 | Wiring mode scale configuration method and system integrating snowflake network and electronic equipment |
| CN117293827B (en) * | 2023-11-27 | 2024-03-19 | 国网天津市电力公司城南供电分公司 | Wiring mode scale configuration method and system integrating snowflake network and electronic equipment |
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