CN110932258A - Diamond type distribution network - Google Patents
Diamond type distribution network Download PDFInfo
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- CN110932258A CN110932258A CN201911149058.1A CN201911149058A CN110932258A CN 110932258 A CN110932258 A CN 110932258A CN 201911149058 A CN201911149058 A CN 201911149058A CN 110932258 A CN110932258 A CN 110932258A
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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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
Abstract
The invention discloses a diamond-type power distribution network, which comprises a plurality of transformer substations, a plurality of switch stations and a plurality of ring network stations, wherein the diamond-type power distribution network adopts a layered and graded structure and is divided into a backbone network which is formed by the transformer substations and the switch stations, takes the switch stations as core nodes, supplies power nearby by four circuits of power supplies at two sides, is connected with the two ring networks and runs in an open loop manner, and a secondary backbone network which is formed by the switch stations and the ring network stations, takes the ring network stations as nodes and takes the switch stations as an upper-level power supply; a transformer substation in a backbone network is provided with self-healing devices according to 10kV outgoing line intervals, and a switching station is provided with a self-healing protection control device according to a bus section. The invention takes a double-ring network of the switching station as a main network, has good power supply and user access adaptability, flexible load transfer and balancing capability between stations and rapid network fault self-healing capability, simultaneously has good economy and feasibility in the construction and transformation of the distribution network in the central urban area, and lays a solid foundation for realizing the high-quality development of the distribution network and constructing a first-class energy internet.
Description
Technical Field
The invention relates to the field of power distribution networks, in particular to a diamond-type power distribution network with a switching station as a node.
Background
At present, some cities have developed a new round of distribution network upgrading and transformation, satisfy the demand that load increases and city development, but the problem and the challenge that medium voltage distribution network faced are still diversified, mainly reflect: (1) the medium-voltage distribution network directly faces users, the existing cable network mainly adopts a single ring network powered by a single-side power supply, and the load transfer capacity between stations is insufficient under the fault condition, so that the power supply safety is influenced; (2) the high-voltage distribution network faces the situation that a large-capacity 110kV main transformer and a small-capacity 35kV main transformer coexist for a long time, but the load balancing capacity between stations under the normal operation mode of the existing medium-voltage distribution network is insufficient, so that the situations of heavy load of a 35kV power grid and light load of a 110kV power grid in a local area coexist; (3) under the current situation of 110(35) kV transformer substations, direct transmission user lines are more, the mounting capacity of part of users is smaller, and the utilization rate of 10kV intervals and outgoing lines of the transformer substations is not high; (4) after the power grid is developed for a long time, the electric quantity is slowly increased, but the requirements on safety and reliability are continuously improved, and the investment benefit of the power distribution network is difficult to embody.
The point-net type wiring of the tokyo in the prior art refers to 22kV point-net type wiring in a core area of a tokyo city, three power incoming lines of each user are respectively connected with a trunk line of three circuits in a T mode, all the three circuits are mainly supplied and run in parallel, the power supply requirement of users with three power supplies is met, and the load rate of the lines can reach 67% in normal running. The mode can realize that main transformer and supplied lines in the station run in parallel, and each user has three power lines, so that instantaneous power failure does not exist when a single line fault occurs; however, the transformer substations lack line contact, load transfer and balance capacity between the substations is insufficient, all loads lose power when the total station is powered off, and load balance between the transformer substations is not facilitated.
In addition, the petal type wiring of the Singapore developed at present means that the Singapore 22kV power distribution network adopts petal-shaped wiring with a transformer substation as a center, two loop feeders of two parallel running transformers from the same transformer substation form a single ring network, and the single ring network operates in a closed loop mode; and (3) setting standby communication (1-3) among petals supplied by different power transformer substations, and performing open-loop operation. The mode can be operated in a closed loop, when a single line fails, the power supply can be guaranteed in full capacity, and instantaneous power failure does not exist; however, under a normal operation mode, interstation load balance needs to break petal closed loop operation, flexibility and feasibility are low, and load cannot be completely transferred under the condition of a partial maintenance mode of N-1.
Moreover, in many cities, a conventional double-loop network is used as a target network frame, and the conventional double-loop network takes a loop network station as a core, four loops of double-side power supplies supply power nearby, operates in an open loop mode and is configured with a power distribution automation function. The method has the advantages that only the load switch is configured in the ring website, and the section switch is not generally configured, so that the investment economy is better; the load transfer capacity between stations and the load balance capacity between stations are high, but the load switches in the ring network station do not have a relay protection function, the substation outlet switches are disconnected under the condition of a fault, the whole line is powered off, then the distribution automation is adopted to carry out fault positioning, fault isolation, network reconstruction and power supply recovery, and the power supply recovery time is in the level of minutes.
In order to meet the requirements of high power supply safety and reliability of an urban power distribution network, a diamond-shaped power distribution network needs to be developed, and a double-loop network of a switching station is used as a main network, so that the upgrading and transformation of the power distribution network are effectively promoted, and the high-quality development of the power distribution network is realized.
Disclosure of Invention
The diamond type power distribution network with the switching stations as the nodes is provided, the switching station double-ring network is used as a main network, the diamond type power distribution network has good power supply and user access adaptability, flexible load transfer and balancing capability between the stations and rapid network fault self-healing capability, meanwhile, the diamond type power distribution network has good economy and feasibility in the construction and transformation of the power distribution network in a central urban area, and a solid foundation is laid for realizing the high-quality development of the power distribution network and constructing a first-class energy Internet.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a diamond-type power distribution network comprises a plurality of transformer substations, a plurality of switch stations and a plurality of ring network stations, wherein the diamond-type power distribution network adopts a layered and graded structure and is divided into a backbone network and a sub-backbone network; the backbone network comprises the transformer substation and the switch stations, the switch stations are used as core nodes, four circuits of power supplies on two sides supply power nearby, the two networks are connected, and the operation is performed in an open loop mode; the secondary network comprises the switch station and the ring network station, and takes the ring network station as a node and the switch station as a superior power supply of the ring network station.
Preferably, the substation is a 110kV substation or a 35kV substation; the switching station is a 10kV switching station; the ring website is a 10kV ring website.
Preferably, in the backbone network, the transformer substation configures a self-healing device according to a 10kV outgoing line interval, and the switch station sets a self-healing protection control device according to a bus section.
Preferably, the transformer substation is connected with the switch stations by a double-path 10kV backbone cable, and any two directly adjacent switch stations are connected by a double-path 10kV backbone cable.
Preferably, the diamond-type distribution network comprises two substations, and each substation adopts two power incoming lines.
Preferably, the backbone network comprises 4-6 switchyards.
Preferably, the user at the open loop terminal is a single-sided power user.
Preferably, the switching station and the ring network station are connected by a 10kV sub-grid cable.
Preferably, the secondary network adopts a single-side power supply single-ring network or double-side power supply double-ring network structure; the ring network station takes a single switch station as a power supply and adopts a single-path 10kV sub-network cable for connection; or the ring network station takes two switching stations as power supplies and adopts a single-path 10kV sub-network cable for connection; or the ring network station takes two switching stations as power supplies and adopts a double-path 10kV sub-network cable for connection.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention has good distributed power supply and micro-grid access adaptability: the diamond-type distribution network is provided with the full circuit breaker and the full longitudinal differential protection for the incoming and outgoing lines of the switching station, so that the problems of adjustment of the existing relay protection and protection refusal and misoperation possibly caused by the influence of fault current and caused by the access of a distributed power supply and a micro-grid can be avoided, and the distributed power supply and the micro-grid can be better accommodated to be accessed into the distribution network.
(2) The invention has good user access adaptability: the 10kV power grid mainly adopts a small-resistance grounding mode, and the inlet and outlet wires of a switching station in the diamond-type power distribution network are provided with full circuit breakers, so that the problem that the fusing curve of a user access point fuse above 800kVA assembly capacity is difficult to be matched with a zero sequence current protection setting value can be avoided, and the access requirement of a high-capacity user is met.
(3) The full interconnection of the invention improves the operation safety and flexibility: a10 kV backbone network in a diamond type power distribution network supplies power to bilateral power supplies of different transformer substations, the contact rate between the transformer substations reaches 100%, the load transfer capacity between the transformer substations reaches 100%, and the diamond type power distribution network can support a higher-level transformer substation to meet the N-1 safe power supply in the maintenance mode except the N-1 safe power supply in the maintenance mode of the power grid; the diamond-shaped distribution network can flexibly adjust the operation mode according to the maintenance plan, and can effectively reduce the time of scheduled maintenance and construction power failure.
(4) The theoretical power supply reliability of the diamond type power distribution network exceeds 99.9996%, the annual household average fault power failure time is less than 2 minutes, 3.2 seconds less than petal type wiring, 11.8 seconds less than a conventional double-loop network, and the diamond type power distribution network reaches a high level.
(5) The comprehensive cost of the newly-built diamond type power distribution network is basically equal to that of a petal type power distribution network, and is increased by about 22 percent compared with a conventional double-ring network; the comprehensive investment of the diamond-shaped power distribution network is upgraded and reformed on the basis of the grid structure mainly comprising the single-ring network of the existing power distribution network, and the diamond-shaped power distribution network can save about 5 percent at most compared with a petal-type power distribution network.
(6) The power distribution protection self-healing device improves the operation reliability.
Drawings
FIG. 1 is a schematic diagram of a diamond-type power distribution network according to the present invention;
fig. 2 is a schematic diagram of diamond-type distribution network inter-site load balancing according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-2, the present invention provides a diamond-type power distribution network comprising a plurality of substations, a plurality of switchyards, and a plurality of ring sites. The transformer substation is a 110(35) kV transformer substation 1, the switching station is a 10kV switching station 2, and the ring network station is a 10kV ring network station 3. The diamond type power distribution network adopts a layered and graded structure and is divided into two levels of a 10kV backbone network and a 10kV sub-backbone network, and power grids of different levels adopt different wiring modes and secondary system configurations.
As shown in fig. 1, the 10kV backbone network uses a switching station 2 as a core node, adopts a double-ring network structure with double-side power supplies, four circuits for nearby power supply, double-ring network connection, open-loop operation and self-healing configuration, has the characteristics of full cables, full circuit breakers, full interconnection and full self-healing, and can recover power supply at the second level after a fault occurs. The 10kV sub-grid network takes the ring network station 3 as a node and the switch station 2 as a superior power supply, and can adopt a single-side power supply single-ring network or double-side power supply double-ring network structure.
Specifically, the method comprises the following steps: the double-loop network connection means that the transformer substation 1 and the switch stations 2 are connected by adopting a double-path 10kV backbone network cable, and any two directly adjacent switch stations 2 are also connected by adopting a double-path 10kV backbone network cable. The diamond type power distribution network is powered by two different 110(35) kV transformer substations 1 through power supplies on two sides, and each transformer substation 1 on one side adopts two loops of power supply incoming lines, so that four loops of power supplies on the two sides are formed for nearby power supply. The open loop operation also means that the user at the open loop terminal is equivalent to a single-sided power user. Optionally, in the 10kV backbone network, each group of double-loop network wiring lines includes 4-6 switching stations. The power supply capacity of the double-ring network line can meet the requirements of a peak load normal mode N-1 and a spring and autumn load overhaul mode N-1.
In addition, in the 10kV sub-network, the switch station 2 and the ring network station 3 are connected by adopting a 10kV sub-network cable, and the cable is supplied by different buses of the same switch station 2 or different switch stations 2 to form a single-ring network or double-ring network structure. Illustratively, the 10kV backbone network adopts a single-side power supply single-ring network, which means that the ring network station 3 uses a single switching station 2 as a power supply and adopts a single-path 10kV backbone network cable for connection. For another example, the 10kV sub-network adopts a double-side power supply single-ring network, which means that the ring network station 3 uses two switching stations 2 as power supply and adopts a single-path 10kV sub-network cable for connection. As another example, the 10kV sub-grid adopts a double-side power supply double-loop network, which means that the ring network station 3 uses two switching stations 2 as power supplies and adopts a double-path 10kV sub-grid cable for connection. The number of nodes of the single-ring network is generally not more than 6, and the number of nodes of the double-ring network is generally not more than 12. When the number of the switching stations 2 in the ground block is more than or equal to 2, the supplied looped network stations are suitable for forming a double looped network connection.
In the embodiment, a self-healing device is configured in a 110(35) kV transformer substation 1 in a 10kV backbone network according to 10kV outgoing line intervals, so that a self-healing switching-on function is realized when the outgoing line intervals open loops; each switching station 2 is provided with a self-healing protection control device according to the bus section. The intelligent distributed power distribution protection self-healing device can be connected with 8 intervals at least, and comprises protection functions of bus protection, fault disconnection protection, accelerated protection after overcurrent of a trunk line switch and a section switch, accelerated protection after zero-sequence overcurrent, overload alarm of the trunk line switch and the like, and self-healing functions of fault isolation, open-loop point switch self-healing closing, local section backup automatic switching and the like.
According to the diamond-type power distribution network, each switch station has four power directions, load transfer can be rapidly realized by matching with self-healing, access of diversified power sources and users is met, the operation safety, reliability, flexibility and adaptability of the power distribution network can be effectively improved, the diamond-type power distribution network is better connected with the current power distribution network structure, large-scale disassembly and construction are avoided, and the economical efficiency and the practicability of upgrading and reconstruction of the power distribution network can be considered.
It is worth explaining that a 10kV backbone network in a diamond-type power distribution network supplies power to bilateral power supplies of different transformer substations, the contact rate between the transformer substations reaches 100%, the load transfer capacity between the transformer substations reaches 100%, and the diamond-type power distribution network can support a higher-level transformer substation to meet the safety power supply of 'N-1' in a maintenance mode except the safety power supply of 'N-1' in the maintenance mode of the power grid; the diamond-shaped distribution network can flexibly adjust the operation mode according to the maintenance plan, and can effectively reduce the time of scheduled maintenance and construction power failure.
Especially, the diamond distribution network can effectively balance the load level of the power substations on two sides by flexibly adjusting the number of the switching stations supplied by the substations in a normal operation mode on the premise of not reducing the power supply reliability of the distribution network, and is very suitable for the characteristics that the number of the 110kV substations of some distribution networks is less than 35kV, the capacity of a single main transformer is doubled and more than 35kV, and sites are inserted among a large number of 35kV substations, and the schematic load balance diagram of the diamond distribution network is shown in fig. 2. In the figure, numerals 11, 12, 13, 14, and 15 denote 110(35) kV substations, numerals 21, 22, 23, 24, and 25 denote 10kV switchyards, and numeral 300 denotes a 10kV ring site, respectively. Line marks S1 and S2 denote a backbone network cable and a secondary network cable.
In addition, the full self-healing of the invention improves the operation reliability, which is embodied in that: (a) the diamond type power distribution network original full-line configuration self-healing system is characterized in that a self-healing protection control device is arranged in a 10kV switching station according to a bus section, has the functions of remote measurement, remote signaling and remote control at intervals, completes information acquisition on site, and automatically executes a self-healing strategy at a remote place; (b) the self-healing system exchanges switching values and fault information between the switch stations by using the optical fiber channel, realizes a second-level recovery function under the fault condition, and effectively ensures the load transfer capacity under the fault condition; (c) in the aspect of fault power failure time, the diamond type power distribution network operates in an open loop mode, when a single fault occurs, self-healing switching can be performed by using a line, and only a second-level power failure phenomenon exists; (d) from the fault power failure range, the diamond-shaped power distribution network is provided with the circuit breaker, a single fault only stops a fault section, and the fault influence range is small.
In this embodiment, the switchyard incoming and outgoing lines are all configured with circuit breakers, and a single-bus segmented connection mode is adopted. The switching station can properly configure a distribution transformer according to the peripheral low-voltage power demand; the outlet switch of the switching station is provided with protection such as overcurrent and zero current, and when the circuit of the secondary network fails, the outlet protection action trips the outlet switch. For newly-built power distribution networks, all ring network stations synchronously configure terminal equipment, optical cables and optical fiber private network equipment according to a three-remote standard; for the established power distribution network, the economic and practical principle and the difference distinguishing principle are considered comprehensively, and part of ring network stations are selected to be transformed into 'three remote' key nodes to configure terminal equipment, optical cables and optical fiber private network equipment.
Illustratively, the first section of cable at two sides of the 10kV trunk ring network line can adopt a double-spliced 3X 400mm2Cable (two)The cables are parallel, and the inside of each cable is provided with three 400mm cables2The middle section can adopt a double-spliced 3X 400mm2Or 3X 400mm2An electrical cable. The 10kV secondary dry ring network line can adopt 3 multiplied by 240mm2Or 3X 120mm2The cable has the highest load rate average value of the two incoming lines not higher than 50%.
In conclusion, the diamond-type power distribution network provided by the invention takes a switch station double-loop network as a main network, has good power supply and user access adaptability, flexible inter-station load transfer and balance capability and rapid network fault self-healing capability, has good economy and feasibility in the construction and transformation of the central urban power distribution network, and lays a solid foundation for realizing the high-quality development of the power distribution network and constructing a first-class energy internet
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (9)
1. A diamond-type power distribution network is characterized by comprising a plurality of transformer substations, a plurality of switch stations and a plurality of ring network stations, wherein the diamond-type power distribution network adopts a hierarchical structure and is divided into a backbone network and a sub-backbone network; the backbone network comprises the transformer substation and the switch stations, the switch stations are used as core nodes, four circuits of power supplies on two sides supply power nearby, the two networks are connected, and the operation is performed in an open loop mode; the secondary network comprises the switch station and the ring network station, and takes the ring network station as a node and the switch station as a superior power supply of the ring network station.
2. A diamond-type power distribution network as defined in claim 1,
the transformer substation is a 110kV transformer substation or a 35kV transformer substation;
the switching station is a 10kV switching station;
the ring website is a 10kV ring website.
3. A diamond-type power distribution network as defined in claim 2,
in the backbone network, the transformer substation is equipped with the self-healing device according to 10kV interval of being qualified for the next round of competitions, the switching station sets up self-healing protection controlling means according to the generating line section.
4. A diamond-type power distribution network as defined in claim 2,
the transformer substation is connected with the switch stations through double-path 10kV backbone cables, and any two directly adjacent switch stations are connected through double-path 10kV backbone cables.
5. A diamond-type power distribution network as defined in claim 1,
the transformer substation comprises two transformer substations, and each transformer substation adopts two power incoming lines.
6. A diamond-type power distribution network as defined in claim 1,
the backbone network comprises 4-6 switching stations.
7. A diamond-type power distribution network as defined in claim 1,
the user at the open loop terminal is a single-sided power user.
8. A diamond-type power distribution network as defined in claim 2,
the switching station is connected with the ring network station by adopting a 10kV sub-grid cable.
9. A diamond-type power distribution network as defined in claim 8,
the secondary network adopts a single-side power supply single-ring network or double-side power supply double-ring network structure;
the ring network station takes a single switch station as a power supply and adopts a single-path 10kV sub-network cable for connection; or the ring network station takes two switching stations as power supplies and adopts a single-path 10kV sub-network cable for connection; or the ring network station takes two switching stations as power supplies and adopts a double-path 10kV sub-network cable for connection.
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| CN201911149058.1A CN110932258A (en) | 2019-11-21 | 2019-11-21 | Diamond type distribution network |
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| CN201911149058.1A CN110932258A (en) | 2019-11-21 | 2019-11-21 | Diamond type distribution network |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111555458A (en) * | 2020-05-24 | 2020-08-18 | 赫兹曼电力（广东）有限公司 | Distributed feeder automation system of looped network circuit architecture |
| CN112848946A (en) * | 2021-02-20 | 2021-05-28 | 国网上海市电力公司 | Electric automobile charging pile charging improvement method based on distribution optimization of power distribution network |
| CN113054631A (en) * | 2021-03-29 | 2021-06-29 | 国网河北省电力有限公司电力科学研究院 | Power distribution network fault isolation self-healing system and method |
| CN113889985A (en) * | 2021-10-09 | 2022-01-04 | 国网上海市电力公司 | Relay protection system of diamond type electric wire netting |
| CN115859547A (en) * | 2023-02-27 | 2023-03-28 | 国网江西省电力有限公司电力科学研究院 | Automatic generating system and method for distribution line fixed value scheme |
| CN116646978A (en) * | 2023-07-26 | 2023-08-25 | 国网上海市电力公司 | Self-healing device based on diamond type power distribution network |
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2019
- 2019-11-21 CN CN201911149058.1A patent/CN110932258A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111555458A (en) * | 2020-05-24 | 2020-08-18 | 赫兹曼电力（广东）有限公司 | Distributed feeder automation system of looped network circuit architecture |
| CN112848946A (en) * | 2021-02-20 | 2021-05-28 | 国网上海市电力公司 | Electric automobile charging pile charging improvement method based on distribution optimization of power distribution network |
| CN113054631A (en) * | 2021-03-29 | 2021-06-29 | 国网河北省电力有限公司电力科学研究院 | Power distribution network fault isolation self-healing system and method |
| CN113054631B (en) * | 2021-03-29 | 2022-07-22 | 国网河北省电力有限公司电力科学研究院 | Power distribution network fault isolation self-healing system and method |
| CN113889985A (en) * | 2021-10-09 | 2022-01-04 | 国网上海市电力公司 | Relay protection system of diamond type electric wire netting |
| CN113889985B (en) * | 2021-10-09 | 2024-03-19 | 国网上海市电力公司 | Relay protection system of diamond type power grid |
| CN115859547A (en) * | 2023-02-27 | 2023-03-28 | 国网江西省电力有限公司电力科学研究院 | Automatic generating system and method for distribution line fixed value scheme |
| CN116646978A (en) * | 2023-07-26 | 2023-08-25 | 国网上海市电力公司 | Self-healing device based on diamond type power distribution network |
| CN116646978B (en) * | 2023-07-26 | 2023-10-03 | 国网上海市电力公司 | Self-healing device based on diamond type power distribution network |
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