CN206932003U - A kind of expansible how annular Urban Medium Voltage Distribution Network system - Google Patents
A kind of expansible how annular Urban Medium Voltage Distribution Network system Download PDFInfo
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- CN206932003U CN206932003U CN201720725346.7U CN201720725346U CN206932003U CN 206932003 U CN206932003 U CN 206932003U CN 201720725346 U CN201720725346 U CN 201720725346U CN 206932003 U CN206932003 U CN 206932003U
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Abstract
The utility model embodiment discloses a kind of expansible how annular Urban Medium Voltage Distribution Network system, and for solving, domestic existing radial distribution networks grid structure is weak, load factor is high, reliability is low, the technological deficiency for the time length that restores electricity.The utility model embodiment includes：It is provided with the meshed distribution network frame of the ring of 1 or more than 1；Include at least one transformer station and at least two switchyards in each ring of meshed distribution network frame, the 10kV sides of transformer station are provided with the bus I and bus II of transformer station's bus connection switch connection, and switchyard is internally provided with the bus I and bus II connected by switchyard bus connection switch；The bus I of all switchyards in each ring connects and composes independent inside subring I, and the bus II of all switchyards in each ring connects and composes independent inside subring II；The bus I of transformer station is connected with the bus I of switchyard, and the bus II of transformer station is connected with the bus II of switchyard.
Description
Technical field
The present invention relates to be press-fitted in Urban Medium Voltage Distribution Network technical field, more particularly to a kind of expansible how annular city
Network system.
Background technology
Urban Medium Voltage Distribution Network is in power system end, is responsible for and ensures the reliable continued power of user and provide good electric
The effect of energy quality.The short of electricity puzzlement of the past few decades result in deviation of the power construction in the presence of " retransmitting, light confession is not effective ",
Distribution long-term lacking reasonably plans, poor infrastructure.With the fast development of China's economy especially urban economy, distribution
Having been showed in net has the contradiction of electric " can't get into, can not fall any more, not using ", urban distribution network power supply reliability, the quality of power supply and
The contradiction of urban economy development requirement is more and more prominent, wherein, the development of mid-voltage distribution network frame structural disorder be its major reason it
One.
Rational grid structure is power distribution network economy, reliable, intelligent operation control basis, and China's distribution is managed in planning
Thought, grid structure, equipment, the method for operation, automation etc. all govern electrical network economy, safety, quality supply.Compare
The country, many developed countries have gradually formed the middle pressure network frame knot with own characteristic during very long power network development
Structure, using the power supply model of standardization.So in distribution network planning work, the space truss project of power distribution network is critically important one
Individual part.It is studied, the efficiency of investment of electric power enterprise can be improved, to reducing power network electric energy loss, increasing substantially
Reliability, power supply quality and the saving energy are all of great immediate significance.
With the rapid raising of domestic suburbs urbanization degree, the existing medium voltage distribution network rack knot based on radiation type electric supply
Structure shows a series of defect：(1) load factor is too high, and segmentation is unreasonable, and connectivity number is very few, can not meet N-1 criterions；
(2) power distribution network transformer station power supply point is very few, and 10kV outgoing line intervals are very few, and low capacity Middle Voltage takes transformer station 10kV intervals mistake
It is more, cause transformer station 10kV intervals utilization ratio low；(3) rack is unreasonable, and circuit is long, Yong Huduo, 10kV line powerings half
Footpath is excessive；(4) power failure range is big caused by breaking down, and the ability to restore electricity is weaker etc..Although also it is widely present both at home and abroad
Pressed in " handing in hand " power distribution network and Singapore's " plum blossom-shaped " power distribution network as the various forms of ring type structures of representative using Paris, FRA
Distribution network structure, all it is open loop operation state although these power distribution networks have ring type structure, although therefore technical feasibility, tool
There is a good autgmentability, but improvement cost is high, reliability is without can realize rapid raising.
To sum up, urban power distribution network is the most important and final link in face of user.Ensure to customer power supply it is high-quality,
It is economical and reliable, it is necessary to reasonably to select the structural model of medium voltage distribution network rack.Therefore study and structure one kind is suitable for this
Ground characteristic, meet security, cost-effectiveness requirement, exploitativeness and scalability are preferable, the distribution network structure of optimization
Structure has very important realistic meaning.
Utility model content
The embodiments of the invention provide a kind of expansible how annular Urban Medium Voltage Distribution Network system, solves domestic existing
Radial distribution networks grid structure it is weak, load factor is high, reliability is low, the technological deficiency for the time length that restores electricity.
A kind of expansible how annular Urban Medium Voltage Distribution Network system provided in an embodiment of the present invention, including：
It is provided with the meshed distribution network frame of the ring of 1 or more than 1；
Include at least one transformer station and at least two switchyards in each ring of meshed distribution network frame, transformer station
10kV sides are provided with the bus I and bus II of transformer station's bus connection switch connection, and switchyard, which is internally provided with, passes through switchyard
The bus I and bus II of bus connection switch connection；
The bus I of all switchyards in each ring connects and composes independent inside subring I, all switches in each ring
The bus II stood connects and composes independent inside subring II；
The bus I of transformer station is connected with the bus I of switchyard, for being powered for internal subring I, the bus II of transformer station with
The bus II of switchyard connects, for being powered for internal subring II；
In normal operating condition, transformer station's bus connection switch and switchyard bus connection switch are off-state.
Alternatively, the transformer fanout operation of transformer station.
Alternatively, when meshed distribution network erection is equipped with the ring of more than 1, the position relationship between ring and ring is inside and outside nested
Annexation.
Alternatively, when meshed distribution network erection is equipped with the ring of more than 1, it is connected between ring and ring by power switch.
Alternatively, power switch is breaker.
Alternatively, the transformer circuit of transformer station is equiped with short circuit current limiter；
And/or
The transformer of transformer station uses high-impedance transformer.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：
The embodiments of the invention provide a kind of expansible how annular Urban Medium Voltage Distribution Network system, including：It is provided with 1
Or the meshed distribution network frame of the ring of more than 1；Include at least one transformer station and at least two in each ring of meshed distribution network frame
Individual switchyard, the 10kV sides of transformer station are provided with the bus I and bus II of transformer station's bus connection switch connection, inside switchyard
It is provided with the bus I and bus II of the connection of switchyard bus connection switch；The bus I of all switchyards in each ring connects structure
Into independent inside subring I, the bus II of all switchyards in each ring connects and composes independent inside subring II；Transformer station
Bus I be connected with the bus I of switchyard, for being powered for internal subring I, the bus II of transformer station and the bus II of switchyard
Connection, for being powered for internal subring II；In normal operating condition, transformer station's bus connection switch and switchyard bus connection switch are
Off-state.By forming loop configuration by " being handed in hand " between switchyard in the embodiment of the present invention, and transformer station is respectively to dividing
Duan Yunhang switchyard is powered, and forms a bus I and bus II by switchyard each independent cyclic ring-type distribution
Rack, and the meshed distribution network frame can be expanded according to the concrete condition of urban geography environment and power grid construction, form tool
There is the multiring structure of the ring of more than 1 so that when a certain ring goes wrong, carry out turning power supply from other rings, further improve
The power supply reliability of power distribution network, expansible how annular Urban Medium Voltage Distribution Network system provided in an embodiment of the present invention belong to ring-like knot
Structure Electromagnetic coupling power distribution network, except meeting the N-1 of classical secrecy index such as circuit and transformer station, short circuit current in conventional circuit breaker
Breaking capacity inside and outside, also with transformer station load factor is balanced, interval utilization rate is high, power supply gos deep into load center, power supply area
Clearly, the features such as method of operation is flexible, scalability is strong, solve domestic existing radial distribution networks grid structure it is weak,
Load factor is high, reliability is low, the technological deficiency for the time length that restores electricity.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, before creative labor is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of expansible how annular Urban Medium Voltage Distribution Network system provided in an embodiment of the present invention
Figure；
Fig. 2 is that a kind of distant view of expansible how annular Urban Medium Voltage Distribution Network system provided in an embodiment of the present invention is expanded
Schematic diagram；
Fig. 3 is a kind of bicyclic rack Electromagnetic coupling model modeling flow chart of medium voltage distribution network provided in an embodiment of the present invention；
Fig. 4 is a kind of preliminary rack figure of medium voltage distribution network dual-ring network provided in an embodiment of the present invention；
Fig. 5 is a kind of medium voltage distribution network dual-ring network amendment rack figure provided in an embodiment of the present invention；
Fig. 6 is that the big slope in a kind of bicyclic rack Electromagnetic coupling model in city provided in an embodiment of the present invention becomes and city east becomes
Inside connection figure；
Fig. 7 is a kind of bicyclic rack Electromagnetic coupling power distribution network schematic diagram in city provided in an embodiment of the present invention；
Fig. 8 is a kind of electrical block diagram of short-circuit analysis provided in an embodiment of the present invention.
Embodiment
It is domestic existing for solving the embodiments of the invention provide a kind of expansible how annular Urban Medium Voltage Distribution Network system
Some radial distribution networks grid structures are weak, load factor is high, reliability is low, the technological deficiency for the time length that restores electricity.
Refer to Fig. 1 and Fig. 2, a kind of expansible how annular Urban Medium Voltage Distribution Network system provided in an embodiment of the present invention
One embodiment, including：
It is provided with the meshed distribution network frame of the ring of 1 or more than 1；
Include at least one transformer station and at least two switchyards in each ring of meshed distribution network frame, transformer station
10kV sides are provided with the bus I and bus II of transformer station's bus connection switch connection, and switchyard, which is internally provided with, passes through switchyard
The bus I and bus II of bus connection switch connection；
The bus I of all switchyards in each ring connects and composes independent inside subring I, all switches in each ring
The bus II stood connects and composes independent inside subring II；
The bus I of transformer station is connected with the bus I of switchyard, for being powered for internal subring I, the bus II of transformer station with
The bus II of switchyard connects, for being powered for internal subring II；
In normal operating condition, transformer station's bus connection switch and switchyard bus connection switch are off-state.
Further, the transformer fanout operation of transformer station.
Further, when meshed distribution network erection is equipped with the ring of more than 1, the position relationship between ring and ring is interior outer
The annexation of set.
Further, when meshed distribution network erection is equipped with the ring of more than 1, it is connected between ring and ring by power switch
Connect.
Further, power switch is breaker.
Further, the transformer circuit of transformer station is equiped with short circuit current limiter；
And/or
The transformer of transformer station uses high-impedance transformer.
Specifically, below with reference to Fig. 1 and Fig. 2, one kind provided in an embodiment of the present invention can be expanded with specific application examples
The how annular Urban Medium Voltage Distribution Network system of exhibition is described in detail.
Referring to Fig. 1, (solid line is the connecting line between I mother and I mother in figure, and dotted line is the connecting line between II mother and II mother) is originally
A kind of concrete application example for expansible how annular Urban Medium Voltage Distribution Network system that inventive embodiments provide includes：
Transformer station A and transformer station B, and switchyard A, switchyard B, switchyard C, switchyard D；
Wherein, switchyard A, switchyard B, switchyard C, switchyard D bus I are connected and form independent inside subring I, become
Power station A bus I is connected with switchyard A, switchyard B bus I, and transformer station A is in internal subring I by the annexation
Switchyard A, switchyard B power supply；Transformer station B bus I is connected with switchyard C, switchyard D bus I, and transformer station B passes through
The annexation is switchyard C, switchyard the D power supply in internal subring I.Switchyard A, switchyard B, switchyard C, switchyard D
Bus II be connected and form independent inside subring II, transformer station A bus II and switchyard A, the switchyard B phase of bus II
Even, transformer station A is powered by the annexation for switchyard A, the switchyard B in internal subring II；The transformer station B He of bus II
Switchyard C, switchyard D bus II be connected, transformer station B by the annexation be internal subring II in switchyard C, switch
The D that stands powers.In normal operation, the bus connection switch in ring is all to disconnect：Connection bus I and bus II inside each switchyard
Bus connection switch disconnect, realize switchyard partition running；The bus I of 10kV sides connection and the mother of bus II of each transformer station
Switch off, realize the transformer fanout operation of transformer station.
Can for ease of clearly illustrate expansible how annular Urban Medium Voltage Distribution Network system provided in an embodiment of the present invention
Autgmentability, it see in Fig. 2 and the explanation carried out extended to the distant view of rack, i.e., the monocyclic ring-type rack shown in Fig. 1 can be by Fig. 2
It is shown constantly to expand to N number of ring, i.e. relation nested layer by layer between inner ring and outer shroud, and work as and be provided with including 2 or more rings
Ring-type rack when, be connected between ring and ring by power switch.When it is implemented, can be as the case may be in adjacent ring
Power switch is set between switchyard, and breaker can be used to realize for power switch.During normal cyclization power supply, the switch shown in Fig. 2
(including bus connection switch and the power switch of interannular in ring) does not close, only needs to adjust the method for operation when failure
Ability closing section or whole when whole.The ring type supply scheme reliability that the present invention designs is higher, basic to be opened without the electric power of interannular
Guan Laizhuan supplies load, therefore can also be not provided with power switch in interannular.
In addition, it is contemplated that being easy to the short circuit current of control system, the transformer circuit of transformer station is equiped with short circuit current limiter
And/or the transformer of transformer station uses high-impedance transformer.Two ways simultaneously use or optionally one can, specifically set
Putting the realization present invention, it will not go into details.
It is for a kind of knot of expansible how annular Urban Medium Voltage Distribution Network system provided in an embodiment of the present invention above
The detailed description of the concrete application example of structure, in order to further illustrate expansible how annular city medium-voltage distribution provided by the invention
The technique effect of net system, it is below the medium voltage distribution network that model is applied to domestic a certain city by the distribution network system provided
In the actual design in (hereinafter referred to as A cities), and carry out detailed concrete application scheme explanation.
Specifically include following planning step：
(1) exist from the actual conditions of electric network composition, status of equipment and operation level analysis Urban Medium Voltage Distribution Network, analysis
Weak spot.
A. electric network composition
A) urban distribution network 110kV bus arrangements pattern
B) urban power distribution network backbone distribution of lengths
C) connection modes in urban distribution networks
B. status of equipment and operation level
D) transformer station's situation
E) 110kV circuit analysises
F) capacity-load ratio is analyzed
G) " N-1 " check analysis
H) trend, short circuit, line loss, voltage level analysis are carried out to present situation high-voltage fence
I) power distribution network insulation rate, the analysis of cable rate
J) wire type, cross-section analysis
K) circuit operation time limit analysis
L) line load rate and the analysis of safe and reliable power supply capacity
M) distribution transforming load factor is analyzed
N) with Variant number, capacity and operation time limit analysis
(2) domestic and international medium voltage distribution network power supply model is investigated, with reference to distribution network planning directive/guide, it is proposed that instruct to press in city
The planning principles of power distribution network power supply modelling.
A. Space Truss Design standardizes, modelling：
Standardization, modeled design can greatly reduce the workload of planning and designing department, facilitate power distribution network to extend, beneficial to reality
Now automate, clear and definite networking standard and evaluation system are provided using unified control strategy, and for the access of medium voltage side user.
B. modelling should combine urban characteristic：
During specific design model, the feature in city need to be combined, and in terms of it is largely embodied in landform region, such as bar
The ring design of typical case three of multitude is exactly to be designed according to Paris City Terrain region.And country of Singapore is smaller, each department development is relative
Equilibrium, physical features is low to put down to provide possibility using unified plum blossom-shaped power supply model construction.
C. model should possess scalability：
Power supply model should possess good autgmentability, with the continuous development in city, the continuous extension increase of load, and displaying
Its high flexibility, this is the unified guarantee built of power network.
D. power distribution network coordinated developments at different levels：
To improve reliability as basic principle, high, medium and low pressure network is promoted to develop in harmony；With due regard between layers
Load is shifted and mutually supported, and medium voltage distribution network power supply model is possessed good load transfer ability.
(3) boundary condition of the high voltage distribution network as research Urban Medium Voltage Distribution Network is established, it is right based on grid structure theory
Urban Medium Voltage Distribution Network grid structure model carries out Preliminary design.Verified by static security, short circuit current level and electromagnetism ring
Net analysis is modified to model.
(4) the Urban Medium Voltage Distribution Network wire frame model based on foundation, feasibility point is carried out to it in terms of following 7 respectively
Analysis, verifies its feasibility.
A. feasibility analysis is built
A) transformer station's compartment analysis
B) line channel is analyzed
B. load level is analyzed
C. characteristics of tidal flow
A) transformer station is to switchyard trend
B) trend between switchyard
D. short-circuit current level is analyzed
E. static security analysis
F. fail-safe analysis
G. scalability Analysis
The reconstruction flow of A urban distribution networks is as shown in Figure 3：
The first step, A urban distribution network As-Is analysis：Power network As-Is analysis is following power network development, planning, the basis built
With foundation.Labor is carried out to A cities power distribution network in terms of high voltage distribution network, low and medium voltage distribution network two, it is indicated that existing power distribution network
The middle weak link for needing to transform, instructs the planning and design of A urban distribution networks.
The present situation that hangs up a Chinese lantern be present with design nonstandardized technique, circuit in the current grid structure development of A city networks；Electric energy matter simultaneously
Measure that relatively low, reliability is not high, additionally due to power channel and land resource are deficient, the difficulty for increasing transformer station newly is larger.Specific point
Analysis is as follows：
110kV power network lines section is with 185mm2Based on, circuit conveying capacity is not high, 110kV transforming plant main transformer load factors
Higher, totally 4 can not meet main transformer " N-1 ", and failure afterload transfer ability is weaker.A cities are mainly become (in city with T-shaped mouth
Become), Jin Quanbian, big slope become, green hill become, the duck pool become 5 110 kv substations be powered to city, wherein with T-shaped mouth become
With Jin Quan become based on power to down town, power supply area accounts for the 70% of whole city, as long as any one station dead electricity, will cause A
The power failure of the border town of city half, and restricted by line powering capacity and passage and power supply can not be shifted.
10kV medium voltage distribution networks part circuit radius of electricity supply is exceeded, the circuit of single radiation Connection Mode totally 22 times, connection
Network rate is that 65.6%, N-1 percent of pass is only 30%, and load transfer is difficult when easily causing failure.And the load factor of circuit is put down
Horizontal higher, distribution transforming load factor is unbalanced.
Second step, it is proposed that the prcgramming ideas of the bicyclic power distribution network of A urban construction Electromagnetic couplings：With China's economy especially
The fast development of urban economy, the contradiction of urban distribution network power supply reliability, the quality of power supply and urban economy development requirement is increasingly
It is prominent, wherein, middle pressure network frame structural disorder development is one of its major reason.
(1) domestic and international developed country urban distribution network typical case power supply model
In each subregion in Singapore city, the every twice 22kV feeder lines of transformer station form looped network, form petal design, referred to as plum
Flower-shaped power supply model.It is connected with each other again among each two looped network of different electrical power transformer station, the tangent shape of composition petal type.Its
Network connection is actually to be combined by simply connected network in simply connected network between transformer station and transformer station.Zhan Jian Liaison Divisions separate ring fortune
OK, contact part operation with closed ring in standing, and the liaison office between two looped networks is most important load place.Form more " plums
The city entirety rack of flower " power supply, it is shown that good scalability.
Paris urban distribution network has distinct cyclic structure：Outer shroud, middle ring and inner ring, three rings are divided into 4 points again
Area, each transformer station are between subregion, subregion electricity of the transformer station in each ring to both sides., can be when load increase
Increase by a transformer station between subregion, subregion is divided into two again, it is shown that good scalability.
(2) guideline of Urban Medium Voltage Distribution Network power supply model
With reference to the typical case's power supply model enlightenment of domestic and international developed country's urban distribution network, with reference to distribution network planning directive/guide, A is established
The guideline of city medium voltage distribution network power supply model：
Space Truss Design standardizes, modelling：Standardization, modeled design can greatly reduce the work of planning and designing department
Amount, facilitates power distribution network to extend, and is automated beneficial to realizing, using unified control strategy, and the access for medium voltage side user provides
Clear and definite networking standard and evaluation system.
Modelling should combine urban characteristic：During specific design model, the feature in city need to be combined, and it is largely
In terms of being embodied in landform region, if the ring design of typical case three in Paris is exactly to be designed according to Paris City Terrain region.And Singapore
Country is smaller, each department development relative equilibrium, and physical features is low to put down to provide possibility using unified plum blossom-shaped power supply model construction.
Model should possess scalability：Power supply model should possess good autgmentability, with the continuous development in city, load
Continuous extension increase, show its high flexibility, this is the unified guarantee built of power network.
Power distribution network coordinated developments at different levels：To improve reliability as basic principle, high, medium and low pressure network is promoted to develop in harmony；It is suitable
When considering the transfer of load between layers and mutually support, medium voltage distribution network power supply model is set to possess good load transfer energy
Power.
(3) prcgramming ideas of A cities medium voltage distribution network power supply model
One of most important guideline of middle pressure Space Truss Design is that modelling should combine urban characteristic, and urban characteristic
Largely show in landform regional feature, and power load distributing feature is closely linked with this, for A cities,
Its lineament is that address is flat, and characteristic of city is a typical inner ring and outer ring structure.When planning power distribution network, lead to
Often all it is that the layout of switchyard and network connection are separated to carry out.A cities load shows circular distribution along landform, therefore builds
Mould focus on switch station arrangement, that is, determine switchyard between and its between transformer station how " line " the problem of.
By analyzing the weak spot of A cities present situation power network, domestic and international developed country's medium voltage distribution network power supply model is being summarized
On the basis of, with reference to A lineaments, propose to utilize existing switchyard and planning switchyard most end form in A cities 10kV power distribution networks
Into the theory of interior looped network and ring network, explore it is simple, uniformly, rational Urban Medium Voltage Distribution Network wire frame model.Physical planning
Guiding theory is as follows：
1) formed and become with 110kV T-shaped mouth, the interior looped network centered on becoming in the 110kV cities of the change of the 110kV west of a city and planning,
110kV transformer stations form ring network power supply by 10kV outlets to inner ring web switch station；Formed with 110kV Jin Quan become, planning
110kV city easts become, 110kV green hills become and the big slopes of 110kV become centered on ring network, 110kV transformer stations by 10kV outlets extremely
Outer shroud web switch station forms ring network power supply.
2) directly it is connected from transformer station to switchyard circuit and switchyard circuit by cable, between circuit in principle
Not on-load, all loads are all by switchyard outlet band.
3) private subscribers are by transformer station's direct-furnish.
4) backbone partition running, but allow loop-net operation.
(4) the expected power supply effect of the bicyclic pessimistic concurrency control of A cities medium voltage distribution network
1) power supply reliability is high：Strengthen distribution network structure structure, N-2 can be met compared with N-1 wiring hand in hand, to improve
Power supply reliability lays the foundation；Change the phenomenon that conventional load only has one or two of power supply point power supply simultaneously, reduce city large area
The risk of power failure.
2) power supply gos deep into load center：110 kv substation, 10 kilovolts of buses are extended into city central concentrated load compact district,
Realize overall move forward to load side of transformer station's 10kV buses to power, embody power supply and try one's best and go deep into the original of load center
Then, shorten power distribution network two level rack radius of electricity supply, sound assurance is made for Power quality management.
3) power supply area is clear：It is in charge of reason, power distribution automation lay a good foundation for line loss four.
4) method of operation is flexible：, should in the case of other substation power loss as long as an also 110 kv substations operation
Transformer station can provide emergency power supply for whole city.
3rd step, the modeling of A cities annular net rack：That is the bicyclic rack ring type supply model modeling of A cities medium voltage distribution network.It is negative
Lotus prediction is the basis of urban power network planning, and its degree of accuracy directly affects the quality of Electric Power Network Planning, according to the planning of A cities and A cities
Power supply administration's related data, the estimated year load in A cities is up to 178MW, and wherein inner ring load be 72MW, the arrival of outer shroud load
106MW。
The medium voltage distribution network modeling of A cities, mainly includes two parts, A cities 110kV above high voltage distribution network and A cities
10kV medium voltage distribution networks, wherein A cities 110kV above high voltage distribution network as city medium-voltage distribution network operation boundary condition and
The constraints of upper layer network, A cities 10kV medium voltage distribution networks are research object.The overall flow of modeling is as follows：
(5) high voltage distribution network models
The modeling of high voltage distribution network only considers A areas 500kV, 220kV transformer station, the electrical connection net of 110kV transformer stations
Network；The method of operation uses large load operation mode, and transformer station's load is the peak load in year, and load collection medium value to 110kV becomes
Power station 10kV outlets to switchyard 10kV bus bar sides.
In 500kV/220kV modeling process, balance nodes selection 500kV Shibings become, in the 550kV/220kV nets of foundation
On the basis of frame structure, 220kV/110kV power network modelings are carried out.
(1) the bicyclic rack Preliminary design of 10kV power distribution networks
A cities present situation medium voltage distribution network grid structure model is investigated, with Paris and the warp of Singapore's power distribution network power supply model
It is guideline to test with distribution network planning directive/guide, considers that load development is divided in A cities, with reference to the rule of A cities high voltage distribution network
Situation (coordinated development of mesohigh power distribution network) is drawn, dual-ring network construction is carried out to A urban distribution networks, mainly set including grid structure
Meter, substation location design and switchyard scattered point design.
1) grid structure designs
From the analysis in second step to A lineaments, A landform is flat, and urban structure feature is in one typical
Ring and outer ring structure, load show circular distribution along landform, with reference to medium voltage distribution network Space Truss Design guideline, use for reference Paris
The experience of " handing in hand " ring-type grid structure, on the basis of the present situation power distribution network of A cities, propose to utilize existing switchyard and planning
Switchyard ultimately forms the theory of interior looped network and ring network, and two independent ring-like knots are formed using " handing in hand " between switchyard
Structure.
2) substation location designs
Before distribution planning and designing are carried out, the division in region is powered to city first, analyzes its load type, load
Growth trend, respectively determine City Substation quantity and transformer station power supply area, not transregional power supply, makes power transformation as far as possible
The power supply area stood is clear, and solid foundation is established for the automation of power distribution network.
With reference to the distribution situation of existing A cities 110kV transformer stations, analysis determines following load development need in A cities, point
Analysing A cities needs newly-built 2 110kV transformer stations, therefore the power supply of A cities year target year bicyclic rack shares 6, respectively
Become for 110kV T-shaped mouth, 110kV Jin Quan become, the 110kV west of a city becomes, 110kV green hills become, the big slopes of 110kV become, in planning 110kV cities
Become and planning 110kV city easts become.
Inner ring load is become by 110kV T-shaped mouth, 110kV city easts become, become in 110kV cities, 110kV Jin Quan become and 110kV cities
West becomes totally 5 110KV transformer stations power supplies.Outer shroud load is become by 110kV city easts, become in 110kV cities, 110kV Jin Quan become, 110kV
6 110kV transformer stations power supplies such as the west of a city becomes, 110kV green hills become and the big slopes of 110kV become；
3) switchyard scattered point design
It is determined that after the power supply area of transformer station, with reference to load prediction results, the power supply area of internal looped network and ring network
It is finely divided, each small power supply area is powered by a switchyard.
Fig. 4 is that (in order to which figure is succinct, every circuit is equal in figure for the designed preliminary rack figure of A medium voltage distribution network dual-ring networks
Corresponding two actual loop line roads)：
Inner ring switchyard：Triumphant return residence switchyard, market street switchyard, new nine switchyards, city's herding switchyard, two or six
Two switchyards, power supply building switchyard, rise imperial switchyard, cultural South Road switchyard, big geaster moon switchyard, teachers training school's switchyard
Deng.
Outer shroud switchyard：Qingjian River switchyard, old cement plant switchyard, city build two company's switchyards, Yongfeng east gas station, forever
Rich switchyard, city's landscape switchyard, win southern switchyard, face upward A Sha switchyards, school switchyard is defended in state, fork in the road switchyard, suburbs
Office's switchyard, Qin Yuan hotels switchyard, two imperial switchyards, the very best mansion switchyard, brewery's switchyard etc..
Switchyard, which is occupied, in addition with Shaoshan way switch station, international name does not add cyclization.
Powered by 7 transformer stations for each switchyard.
Wherein A city networks cable is recommended to use model YJV-300, and the current-carrying capacity of the model is 485A, and maximum load
Flow is 8.5MVA, i.e., the maximum active power passed through is 8MW, and the hot steady limit per loop line road is used as using this active power.
Characteristics of tidal flow analysis is carried out to the rack of the Preliminary design, (distribution belongs to receiving end network to static security analysis, does not have
Temporary steady problem) and short-circuit current level analysis, it is known that, the rack institute on-load meets the predicted load in target year, normal operation
Line Flow be no more than the steady limit of heat, medium voltage distribution network circuit is satisfied by N-1, i.e. characteristics of tidal flow and static security analysis
Meet to require, but the maximum up to 56.75kA of short circuit current of urban distribution network, considerably beyond the existing breaker 20kA's in A cities
Blocking is horizontal.
(2) amendment of 10kV dual-ring networks grid structure
Excessive short circuit current is the key factor for restricting the bicyclic power network Electromagnetic coupling in A cities, by being run to electromagnetic looped network
Analysis, short circuit current is excessive more mainly due to dual-ring network loop, there is provided the power supply point of short circuit current is more.So from changing
Enter rack structural point to consider, reducing short-circuit current level mainly has following two aspect：One is to try to reduce electromagnetic looped network operation
Voltage class, to reduce voltage class in loop；Secondly, propose inner and outer ring independent operating, 110kV transformer stations only for inner ring or
Only for the amendment thought of outer shroud switchyard.Thought accordingly, it is proposed that the A cities medium voltage distribution network dual-ring network amendment net shown in Fig. 5
Frame figure：The line between transformer station and switchyard, switchyard and switchyard is have adjusted during amendment, such as the west of a city becomes, becomes in city, fourth
Word mouth becomes only powers into inner ring, and city east becomes, Jin Quan changes are only powered into outer shroud.
Characteristics of tidal flow analysis, static security analysis and short-circuit current level analysis are carried out to rack after amendment, it is known that, the rack
Institute's on-load meets the predicted load in target year, the Line Flow of normal operation is no more than the heat steady limit, medium-voltage distribution netting twine
Road is satisfied by N-1, i.e., characteristics of tidal flow and static security analysis can meet to require, but the short circuit current of urban distribution network still reaches
40.43kA, breaker 20kA existing still above A cities blocking are horizontal.
So far understand, the measure for finding reduction short circuit current level is the key that the bicyclic rack in A cities uses Electromagnetic coupling.
Conventional current limiting measures have：Power system delamination and subarea is run, plant-grid connection system mode of making rational planning for, and improves voltage class and development
Direct current transportation；Guard's valve, circuit are drawn, transformer station uses bus splitting, using high impedance device and installs short circuit current limit additional
Device processed.First four kinds belong to from change electric network composition aspect consider current limiting measures, because change electric network composition to power network will produce compared with
Big influence, therefore refuse and use.And guard's valve, circuit are drawn with improving the target of distribution network reliability on the contrary, therefore also not
Using.
Arranged using for reference transformer station using bus splitting, using high impedance device and three kinds of short circuit current limiter of installation
On the basis of applying, for the purpose of increasing system impedance, the current limiting measures of switchyard bus section operation are proposed first, and will become
The method of operation for changing medium voltage distribution network is run and is referred to as in power station using bus splitting and switchyard bus section, therefore connects down
It is short using high-impedance transformer and transformer station's installation to come the method for operation of demonstration change medium voltage distribution network, transformer station from principle
Demand limiter three kinds of measures in road can effectively reduce the short circuit current (transient process for not considering short circuit) of system.
1) method of operation increase system impedance of medium voltage distribution network is changed
Substation bus bar fanout operation, the operation of switchyard bus section can substantially increase system impedance, effectively reduce short
Road electric current.Both more can effectively reduce short circuit current at the method for operation of mixing.
Qualitative analysis substation bus bar point row and the bus sectional lized hybrid operation mode of switchyard are to short circuit current below
Control action.By taking system shown in Figure 8 structure as an example：Including transformer station A, switchyard A, transformer station B, switchyard B, in must can changing
Short circuit current when three-phase shortcircuit occurs for switchyard A mother's II outlet after the method for operation of press-fitting power network, which is significantly less than in change, presses
Short circuit current before the power distribution network method of operation, concrete analysis are as follows：
Before the method for operation for changing medium voltage distribution network：
After the method for operation for changing medium voltage distribution network：
Wherein, IfShort circuit current when referring to switchyard A mother's II outlet generation three-phase shortcircuit (in such as Fig. 8 at f), E1、E2Refer to
The equivalent electromotive force of two power supply points, ZT11、ZT12、ZT21、ZT22Refer to the equiva lent impedance of substation transformer, ZL11、ZL12、
ZL21、ZL22Refer to line equivalent impedance of the transformer station to switchyard, Z12Refer to the equiva lent impedance of switchyard phase connecting lines.
2) using high-impedance transformer increase system impedance
The short circuit current of 110kV transformer 10kV low-pressure sides and the short circuit current of 10kV partition power grids will become from 110kV
The transformer in power station passes through.It is short when switchyard A mother's II egress line occurs short-circuit by taking equivalent circuit diagram shown in Fig. 8 as an example
Road electric current and transformer impedance ZTIt is inversely proportional, concrete analysis is as follows：
When transformer uses high-impedance transformer, ZT11//ZT12And ZT21//ZT22It will all increase, and then cause IfReduce.Cause
This is capable of the short circuit current of control system from high-impedance transformer.
3) current-limiting reactor is used to increase the impedance of system
The short circuit current of 110kV transformer 10kV low-pressure sides and the short circuit current of 10kV partition power grids will become from 110kV
The transformer in power station passes through.Equally by taking system shown in Figure 8 structure as an example, when switchyard A mother's II egress line occurs short-circuit
Short circuit current is inversely proportional with transformer circuit impedance, short before the transformer circuit installation current-limiting reactor of 110kV transformer stations
Road electric current is as follows：
Short circuit current expression formula after the transformer circuit installation current-limiting reactor of 110kV transformer stations is as follows：
Wherein ZKRefer to the impedance value of the current-limiting reactor of installing inside transformer station.
It is obvious that the transformer circuit in 110kV transformer stations installs current-limiting reactor additional and is capable of the short circuit current of control system.
Analyzed more than, above-mentioned 3 kinds of measures can effectively reduce the short circuit current of power network, i.e.,
1) method of operation for changing medium voltage distribution network is used to increase system impedance；
2) using high-impedance transformer increase system impedance；
3) current-limiting reactor is used to increase the impedance of system.
When individually by the bicyclic rack Electromagnetic coupling model for 1) being used for A cities reality, understood by PSASP simulation calculations,
Now the maximum short circuit current of A cities 10kV power distribution networks is still up to 27.36kA, beyond existing breaker 20kA blocking energy
Power.Therefore individually use method 1) fail to effectively reduce short circuit current to rational level.
When individually will 2) be used for the actual bicyclic rack Electromagnetic coupling model in A cities, in order to by A cities 10kV power distribution networks
Maximum short circuit current is restricted to 20kA level, need to use perunit value XT*=1.4 three-phase windings transformer, far beyond
XT*=0.25 or so normal level, therefore individually use method 2) also infeasible.
Individually it will 3) be used for the actual bicyclic rack Electromagnetic coupling model in A cities, when carrying out simulation calculation using PSASP,
By way of increasing line reactance, the installation of current-limiting reactor is simulated.In order to realize that the overall short-circuit current level of looped network drops to
20kA, the reactor perunit value in emulation are set to XK*=1.2.The circuit model YJV-300 of bicyclic web frame, corresponding maximum load
Flow is 485A, then the rated current of current-limiting reactor is taken as 485A.Percentage reactance calculation formula is substituted into obtain：
In formula, voltage on the basis of Ub, unit kV；Capacity on the basis of Sb, unit MVA；UNKFor the specified electricity of reactor
Pressure, unit kV；INKFor the rated current of reactor, unit kA；XK% is reactance percentage value.
The loss of voltage verifies：
During normal work, the loss of voltage of reactor cannot be greater than the 5% of rated voltage.The calculation formula of the loss of voltage is such as
Under：
In formula, Igmax be reactor lasting maximum operating currenbt, unit A；ψ is load power factor angle, typically about
Equal to 36.78 °；XKFor the impedance value of reactor.
The percentage reactance being calculated is substituted into loss of voltage verification, obtained：
Therefore individually use method 3) also unreasonable.
Therefore method 1 must be used) to method 3) combination carry out the limitation of A cities short circuit current, understood through Simulation Example,
Method 1) change medium voltage distribution network the method for operation to increase the method for system impedance, not only cost is low, and short circuit current limit
Effect is fabulous, therefore the essential braking measure of short circuit current during rack Electromagnetic coupling bicyclic as A cities, therefore proposes following three kinds
The combination of measures for limiting short-circuit current：
Scheme one：Method 1)+method 3)
Scheme two：Method 1)+method 2)
Scheme three：Method 1)+method 2)+method 3)
Hereinafter referred to as three kinds of schemes are：
Scheme one：Current-limiting reactor is installed additional in 110kV transformer stations loop；
Scheme two：Using high-impedance transformer；
Scheme three：Simultaneously current-limiting reactor is installed additional using high-impedance transformer and in the transformer circuit of 110kV transformer stations.
Short circuit current effectively can be reduced to 20kA, simultaneity factor by three kinds of schemes by choosing rational parameter
Voltage loss, power attenuation, voltage level etc. also can meet requirement.Three kinds of schemes are carried out briefly from economy point
Qualitative analysis, recommend to use in the bicyclic rack ring type supply in A cities on the basis of power grid security, reliable and stable operation is met
Scheme one.
Therefore the bicyclic rack Electromagnetic coupling model of A cities medium voltage distribution network proposed is still as shown in figure 5, only internal structure is done
Change as shown in Figure 6：Fig. 6 gives part transformer station to switch so that the big slope of outer shroud becomes and city east becomes power supply area as an example
The inner connecting structure figure stood with switchyard to switchyard, the bus I and II of the big slope change 10kV sides of 110kV connect the Qingjian River and opened respectively
Close station, the bus I and II of the very best mansion switchyard, brewery's switchyard is powered；The bus I and II that 110kV city easts become 10kV sides is distinguished
Connection Qin Yuan hotels switchyard, two imperial switchyards, suburbs office switchyard, fork in the road switchyard, state defend the bus I of school switchyard
With II power supply；Loop connecting between same section of bus of each switchyard.Segmentation bus connection switch wherein inside switchyard disconnects,
The 10kV sides mother of 110kV transformer stations disconnects.A cities finally bicyclic rack Electromagnetic coupling power distribution network schematic diagram as shown in fig. 7, bag
Outer shroud and the bicyclic rack of inner ring are included.
4th step, the bicyclic rack Electromagnetic coupling feasibility analysis in A cities：Grid structure is the muscles and bones of medium voltage distribution network, hard
Strong rack is the basis of reliable, the economic high-quality operation of power grid security, therefore whether grid structure is strong, if is amenable to system
The middle test that big disturbance occurs, turns into the deciding factor that can grid plan modification put into operation.Next from build feasibility,
7 power load distributing, characteristics of tidal flow, short circuit current level, static security analysis and fail-safe analysis, scalability Analysis aspects
The bicyclic rack Electromagnetic coupling model in A cities proposed is analyzed.
(1) feasibility is built
The 110kV transformer stations outgoing line interval utilization power for the grid structure built up to A cities is analyzed, 7 transformer stations
Interval average utilization be 52.4%, maximum interval utilization rate be city east become 75%, therefore to city power seven
There is interval and fully meet requirement in 110kV transformer stations.
The looped network wiring channel feasibility for the grid structure built up to A cities is analyzed, the results showed that the looped network is can
Build.
(2) power load distributing
A cities year load is estimated to be up to 178MW, it is contemplated that the distribution situation of load is that inner ring load reaches 72MW, outer shroud
Load reaches 106MW.Bicyclic web frame power supply model is on the basis of Static Power Flow safety analysis is met to the load of inner and outer ring
Recommend a class value, i.e., inner ring switchyard can on-load 90MW, tackle extreme feelings of the following A cities in year sudden load increase 18MW
Condition；Outer shroud switchyard on-load 132MW.
Characteristics of tidal flow
City dual-ring network power supply has 7, and 110kV transformer stations share 66 to switchyard circuit.Wire type is recommended
Using YJV-300 models, the current-carrying capacity 485A of the model, maximum load amount is 8.5MVA, and the active power that maximum passes through is
8MVA (is not more than 0.95) by power factor.Single back line maximum active power is 5.537MW, no more than 8MW, meets circuit
The steady limit of heat.The strength of current of circuit is 3.477MW between switchyard, is equally also no more than 8MW, meets the hot steady pole of circuit
Limit.
(3) short circuit current level
Install the dual-ring network after current-limiting reactor additional to A cities 110kV transformer stations low-voltage bus bar side and carry out three-phase shortcircuit analysis,
Its median generatrix famous-brand clock shows the bus that three-phase shortcircuit occurs.As can be seen that now Jin Quan becomes short during 10kV buses generation three-phase shortcircuit
Road electric current is maximum, is 16.94kA, but still meet the requirement of breaker 20kA connecting-disconnecting functions.
(4) static security analysis
A urban distribution networks are a typical receiving end power networks, therefore angle stability and transient stability is not present in city network
Problem, therefore the strong property of A city networks mainly considers its static security problem.
Power is used as more than circuit of the power between 3MW and transformer station and switchyard more than 5MW and examined between selection switchyard
Consider object, static security analysis is carried out respectively to it.As a result showing, all circuits are satisfied by N-1 verifications, no circuit overload (with
Active without circuit after N-1 more than 8MW is verification standard).To become 10kV buses in city --- exemplified by cultural South Road switchyard, N-1
Before and after failure in network in circuit of the changed power more than 1MW, maximum variable quantity is 2.843MW, and line power is more than after N-1
In 4MW all circuits, circuit maximum active power is 5.686MW, meets the circuit thermostabilization limit.
(5) fail-safe analysis
Economy and reliability are two very important indexs of power system, but are also conflicting two simultaneously
Index.Very more research is all carried out to these two aspects both at home and abroad at present, but the research for considering both is few, one's duty
Analysis combines two indexs of reliability and economy and the bicyclic rack Electromagnetic coupling model in A cities is assessed.
A city networks can efficiently reduce power failure range and time using Electromagnetic coupling operation with closed ring mode, improve power supply
Reliability, increase delivery.Using this method of operation, existing Internet resources can be fully utilized, user is obtained two
Individual or more power supply power supply, while the reliability of power supply is improved, also greatlys save investment.
Reliability Evaluation Model based on minimal path sets minimal cut set and based on the economic evaluation model for always possessing expense
Analysis shows, the bicyclic pessimistic concurrency control Electromagnetic coupling of A cities medium voltage distribution network are the optimal power supply plan of reliability economy, are now supplied
Electric reliability is 99.998510%, compared to the 99.994% of Paris, Tokyo 99.9914%, London
For 99.9914%, power supply the reliability of the adjustment model economy proposed by the present invention has reached advanced international standard.
To sum up, from feasibility angle analysis is built, the grid structure is feasible in engineering construction, and now interior
Outer bicyclic load capacity also fully meets the workload demand that A cities in 2015 increase.Meanwhile by the A cities dual-ring network
Characteristics of tidal flow analysis, Analysis of Short-Circuit Current and static security analysis are carried out, it was found from PSASP simulation results, the rack trend point
Cloth is reasonable, short-circuit current level is reasonable, can meet N-1 verifies.It is finally based on the dual analysis and assessment of economy reliability and shows the present invention
Not only construction cost is low but also reliability has reached the world for the bicyclic rack Electromagnetic coupling model of A cities weight power distribution network proposed
Advanced level.Therefore from construction feasibility, workload demand, trend, short circuit, static security analysis and the angle of fail-safe analysis, A
It is feasible that city dual-ring network, which carries out Electromagnetic coupling,.
(6) scalability Analysis
From the bicyclic rack Electromagnetic coupling model schematic in A cities in accompanying drawing 7, the A cities medium voltage distribution network proposed
Bicyclic rack cyclization power supply model has very strong independent autgmentability, can be centered on urban district with the continuous expansion in city
Extend and build by ring, and each independent ring-like power distribution network can also support each other in failure so that A urban distribution network phases
Than domestic and international existing medium-voltage distribution pessimistic concurrency control more " strong ", " reliable ".
The embodiments of the invention provide a kind of expansible how annular Urban Medium Voltage Distribution Network system, including：It is provided with 1
Or the meshed distribution network frame of the ring of more than 1；Include at least one transformer station and at least two in each ring of meshed distribution network frame
Individual switchyard, the 10kV sides of transformer station are provided with the bus I and bus II of transformer station's bus connection switch connection, inside switchyard
It is provided with the bus I and bus II of the connection of switchyard bus connection switch；The bus I of all switchyards in each ring connects structure
Into independent inside subring I, the bus II of all switchyards in each ring connects and composes independent inside subring II；Transformer station
Bus I be connected with the bus I of switchyard, for being powered for internal subring I, the bus II of transformer station and the bus II of switchyard
Connection, for being powered for internal subring II；In normal operating condition, transformer station's bus connection switch and switchyard bus connection switch are
Off-state.By forming loop configuration by " being handed in hand " between switchyard in the embodiment of the present invention, and transformer station is respectively to dividing
Duan Yunhang switchyard is powered, and forms a bus I and bus II by switchyard each independent cyclic ring-type distribution
Rack, and the meshed distribution network frame can be expanded according to the concrete condition of urban geography environment and power grid construction, form tool
There is the multiring structure of the ring of more than 1 so that when a certain ring goes wrong, carry out turning power supply from other rings, further improve
The power supply reliability of power distribution network, expansible how annular Urban Medium Voltage Distribution Network system provided in an embodiment of the present invention belong to ring-like knot
Structure Electromagnetic coupling power distribution network, except meeting the N-1 of classical secrecy index such as circuit and transformer station, short circuit current in conventional circuit breaker
Breaking capacity inside and outside, also with transformer station load factor is balanced, interval utilization rate is high, power supply gos deep into load center, power supply area
Clearly, the features such as method of operation is flexible, scalability is strong, solve domestic existing radial distribution networks grid structure it is weak,
Load factor is high, reliability is low, the technological deficiency for the time length that restores electricity.
A kind of expansible how annular Urban Medium Voltage Distribution Network system provided by the utility model has been carried out in detail above
It is thin to introduce, for those of ordinary skill in the art, according to the thought of the utility model embodiment, in embodiment and answer
With there will be changes in scope, in summary, this specification content should not be construed as to limitation of the present utility model.
Claims (6)
- A kind of 1. expansible how annular Urban Medium Voltage Distribution Network system, it is characterised in that including：It is provided with the meshed distribution network frame of the ring of 1 or more than 1；Include at least one transformer station and at least two switchyards, the transformer station in each ring of the meshed distribution network frame 10kV sides be provided with the bus I and bus II of the connection of transformer station bus connection switch, the switchyard, which is internally provided with, to be passed through The bus I and bus II of switchyard bus connection switch connection；The bus I of all switchyards in each ring connects and composes independent inside subring I, all in each ring The bus II of switchyard connects and composes independent inside subring II；The bus I of the transformer station is connected with the bus I of the switchyard, for being powered for the internal subring I, the power transformation The bus II stood is connected with the bus II of the switchyard, for being powered for the internal subring II；In normal operating condition, transformer station's bus connection switch and the switchyard bus connection switch are off-state.
- 2. expansible how annular Urban Medium Voltage Distribution Network system according to claim 1, it is characterised in that the power transformation The transformer fanout operation stood.
- 3. expansible how annular Urban Medium Voltage Distribution Network system according to claim 1, it is characterised in that the ring-type When Distribution Network Frame is provided with the ring of more than 1, the position relationship between ring and ring is inside and outside nested annexation.
- 4. expansible how annular Urban Medium Voltage Distribution Network system according to claim 3, it is characterised in that the ring-type When Distribution Network Frame is provided with the ring of more than 1, it is connected between ring and ring by power switch.
- 5. expansible how annular Urban Medium Voltage Distribution Network system according to claim 4, it is characterised in that the electric power Switch as breaker.
- 6. the expansible how annular Urban Medium Voltage Distribution Network system according to claim 1 or 3, it is characterised in that described The transformer circuit of transformer station is equiped with short circuit current limiter；And/orThe transformer of the transformer station uses high-impedance transformer.
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| CN107086570A (en) * | 2017-06-21 | 2017-08-22 | 广东电网有限责任公司电力科学研究院 | A kind of expansible how annular Urban Medium Voltage Distribution Network system |
| CN108520086A (en) * | 2018-02-11 | 2018-09-11 | 广东电网有限责任公司佛山供电局 | A kind of power distribution network Drawing Network Diagram and automatic generation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086570A (en) * | 2017-06-21 | 2017-08-22 | 广东电网有限责任公司电力科学研究院 | A kind of expansible how annular Urban Medium Voltage Distribution Network system |
| CN108520086A (en) * | 2018-02-11 | 2018-09-11 | 广东电网有限责任公司佛山供电局 | A kind of power distribution network Drawing Network Diagram and automatic generation method |
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