CN102611107A - Urban medium-voltage power distribution network closed-loop power supply system based on annular net rack - Google Patents
Urban medium-voltage power distribution network closed-loop power supply system based on annular net rack Download PDFInfo
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Abstract
The invention discloses an urban medium-voltage power distribution network closed-loop power supply system based on an annular net rack, solving problem that a radiation-type power distribution network rack has a weak structure, is planned disorderly and has low reliability and poor power quality, and the problem of an electromagnetic looped network such as a short circuit current is overlarge if power supply areas of different transformer substations of a typical annular power distribution network run in a closed loop manner. Due to an annular structure formed by hand-in-hand connection between opening transformer substations and closed transformer substations, transformers of the transformer substations run in columns, and 10kV opening transformer substations and closed transformer substations run in sections, thereby forming a closed-loop power supply mode of an annular net rack in which an opening transformer substation I main body and an opening transformer substation II main body respectively and uniquely form loops.
Description
Technical field
The invention belongs to medium voltage distribution network field, city, particularly a kind of city medium-voltage distribution network closed loop electric power system based on ring-like rack.
Background technology
The city medium voltage distribution network is in the electric power system end, is undertaking the effect that guarantees the reliable continued power of user and the good quality of power supply is provided.Short of electricity puzzlement has in the past few decades caused power construction to have the deflection of " retransmit, the light confession don't work ", and the distribution long-term lacking is reasonably planned, poor infrastructure.Fast development along with China's economy especially urban economy; Demonstrated the contradiction that has electricity " to can't get into, can not fall any more, do not use " in the power distribution network; The contradiction that urban distribution network power supply reliability, the quality of power supply and urban economy development require is more and more outstanding; Wherein, medium-voltage distribution grid structure development disorder is one of its major reason.
Reasonably grid structure is the basis of power distribution network economy, reliable, intelligent operation control, and China's distribution is all restricting electrical network economy, safety, quality supply at aspects such as planning theory, grid structure, equipment, operational mode, automations.Compare domesticly, a lot of developed countries have progressively formed the middle pressure grid structure with own characteristic in very long power network development process, all adopt standardized power supply model.So in distribution network planning work, the planning of the rack of power distribution network is a very important part.It is studied, can improve the efficiency of investment of electric power enterprise, to reducing the electrical network electric energy loss, increasing substantially reliability, power supply quality and energy savings and all be of great immediate significance.
Along with the rapid raising of domestic suburbs urbanization degree, existing is that main medium voltage distribution network grid structure shows following a series of defective with the radiation type electric supply: (1) load factor is too high, and segmentation is unreasonable; Connectivity number is very few; It is very few to satisfy N-1 criterion (2) power distribution network transformer station power supply point, and the 10kV outlet is very few at interval, presses the CU 10kV of transformer station at interval too much in the low capacity; Low (3) rack of utilization ratio is unreasonable at interval to cause the 10kV of transformer station; Circuit is long, the user is many, and 10kV line powering radius excessive (4) the power failure scope that causes that breaks down is big, and the ability that restores electricity is more weak etc.Though also extensively existing with " hand in hand " power distribution network and Singapore's " plum blossom shape " power distribution network of Paris, FRA both at home and abroad is the various forms of ring type structure medium voltage distribution network racks of representative; Though but these power distribution networks have loop configuration; But all be the open loop running status; Though so technical feasibility, have good autgmentability, improvement cost is high, reliability does not have to realize rapid raising.
In sum, urban power distribution network is the most important and final link in the face of the user. high-quality, economy and reliable be guaranteed, the structural model of medium voltage distribution network rack must be reasonably selected user's power supply.Therefore study and make up a kind of local characteristic that is suitable for, satisfy fail safe, economy requires, exploitativeness and extensibility preferably, optimized distribution network shelf structure has very important realistic meaning.
Summary of the invention
To the prior art defective, the present invention proposes a kind of city medium-voltage distribution network closed loop electric power system based on ring-like rack.
Technical scheme of the present invention is a kind of city medium-voltage distribution network closed loop electric power system based on ring-like rack, is provided with the ring-type rack that comprises 1 or above ring; Each is equipped with 1 or above transformer station and 2 or above switching station, and each switching station inside is provided with bus I and the II that connects through bus connection switch, and the 10kV side of each transformer station is provided with bus I and the II that connects through bus connection switch; Connected mode in each ring does; The bus I of all switching stations connects and composes independently inner subring I in the ring; The bus I that is connected to switching station through the bus I with transformer station is inner subring I power supply; The bus II of all switching stations connects and composes independently inner subring II in the ring, and the bus II that is connected to switching station through the bus II with transformer station is inner subring II power supply; During normal the operation, all bus connection switches of connection bus I and II all are off-states in each ring.
And, be provided with the ring-type rack that comprises 1 ring, comprise the A of transformer station, B and switching station A, B, C, D in the ring;
The bus I of switching station A, B, C, D link to each other to constitute independently inner subring I, the bus I of the A of the transformer station power supply that links to each other with the bus I of switching station A, B, the bus I of the B of the transformer station power supply that links to each other with the bus I of switching station C, D; The bus II of switching station A, B, C, D link to each other to constitute independently inner subring II, the bus II of the A of the transformer station power supply that links to each other with the bus II of switching station A, B, the bus II of the B of the transformer station power supply that links to each other with the bus II of switching station C, D.
And, the transformer circuit installing short circuit current limiter of transformer station and/or the transformer adopting high-impedance transformer of transformer station.
And, when being provided with the ring-type rack that comprises 2 or above ring, linking to each other through power switch between the ring, when normally moving, all power switches between the ring are off-states.
City medium-voltage distribution network closed loop electric power system based on ring-like rack proposed by the invention belongs to the ring type structure cyclization operation electric power system of initiative; Remove the N-1 satisfy conventional security property index such as circuit and transformer station, short circuit current inside and outside the breaking capacity of conventional circuit breaker, have also that transformer station's load factor is balanced, high, the power supply of utilance gos deep into characteristics such as load center, power supply area is clear, operational mode is flexible, extensibility is strong at interval.Compare the power distribution network of existing open loop operation, cyclization operation power distribution network proposed by the invention can significantly improve power supply reliability.
Description of drawings
Fig. 1 is the electric power system sketch map of the embodiment of the invention.
Fig. 2 is an electric power system distant view expander graphs of the present invention.
Fig. 3 is a Kerry medium voltage distribution network dicyclo rack cyclization moving model modeling flow chart.
Fig. 4 is the preliminary rack figure of Kerry medium voltage distribution network dual-ring network.
Fig. 5 is Kerry medium voltage distribution network dual-ring network correction rack figure.
Fig. 6 is the inside connection layout that big slope becomes and the city east becomes in city, the Kerry dicyclo rack cyclization moving model.
Fig. 7 is city, a Kerry dicyclo rack cyclization operation electric power system sketch map.
Fig. 8 is the electrical block diagram of short-circuit analysis.
Fig. 9 is unit, Kerry power supply model sketch map.
Embodiment
City medium-voltage distribution network closed loop electric power system based on ring-like rack provided by the present invention; Cyclization power supply design is: comprise 1 or 1 above transformer station and 2 or 2 above switching stations, the bus I of switching station is connected to independently inner subring, and carries out the cyclization power supply by the bus I of transformer station; The bus II of switching station is connected to independently inner subring; And carry out the cyclization power supply by the bus II of transformer station, a ring-type is formed in two inner subrings, is called 1 ring.So expansion can form 2 rings, 3 rings ... The ring-type rack of N ring.
According to this design, be provided with the ring-type rack that comprises 1 or above ring based on the city medium-voltage distribution network closed loop electric power system of ring-like rack; Each is equipped with 1 or above transformer station and 2 or above switching station, and each switching station inside is provided with bus I and the II that connects through bus connection switch, and the 10kV side of each transformer station is provided with bus I and the II that connects through bus connection switch; Connected mode in each ring does; The bus I of all switching stations connects and composes independently inner subring I in the ring; The bus I that is connected to switching station through the bus I with transformer station is inner subring I power supply; The bus II of all switching stations connects and composes independently inner subring II in the ring, and the bus II that is connected to switching station through the bus II with transformer station is inner subring II power supply; During normal the operation, all bus connection switches of connection bus I and II all are off-states in each ring.
Specify technical scheme of the present invention below in conjunction with accompanying drawing and embodiment.According to this area custom bus I and II are designated the female and II mother of I respectively in the accompanying drawing.
As shown in Figure 1, the city medium-voltage distribution network closed loop electric power system based on ring-like rack of embodiment comprises A of transformer station and B, reaches switching station A, B, C, D, and connected mode is following:
The bus I of switching station A, B, C, D links to each other and constitutes independently inner subring I, and the bus I of the A of transformer station links to each other with the bus I of switching station A, B, and the A of transformer station is connected to switching station A, B power supply among the inner subring I through this; The bus I of the B of transformer station links to each other with the bus I of switching station C, D, and the B of transformer station is connected to switching station C, D power supply among the inner subring I through this.The bus II of switching station A, B, C, D links to each other and constitutes independently inner subring II, and the bus II of the A of transformer station links to each other with the bus II of switching station A, B, and the A of transformer station is connected to switching station A, B power supply among the inner subring II through this; The bus II of the B of transformer station links to each other with the bus II of switching station C, D, and the B of transformer station is connected to switching station C, D power supply among the inner subring II through this.There are 110kv, 35kv, several kinds of voltages of 10kv in transformer station inside, and connection of the present invention only relates to the bus I and the II of 10kV side.During normal the operation, the bus connection switch in the ring all breaks off: the bus connection switch of inner connection bus I of each switching station and II breaks off, the partition running of realization switching station; Bus I that the 10kV side of each transformer station connects and the bus connection switch of II break off, and realize the transformer fanout operation of transformer station.
Extensibility for ease of clear explanation electric power system of the present invention; Having drawn Fig. 2 describes the distant view expansion of rack; Be that monocycle ring-type rack shown in Figure 1 can constantly expand to N ring by Fig. 2, when being provided with the ring-type rack that comprises 2 or above ring, link to each other through power switch between the ring.During practical implementation, can between the switching station of adjacent ring, power switch be set as the case may be, power switch can use circuit breaker to realize.During normal cyclization power supply, switch shown in Figure 2 (comprising the bus connection switch and the power switch of interannular in the ring) is all not closed, closing section or whole just in the time of only under situation such as fault, need adjusting operational mode.The annular electric supply scheme reliability of the present invention's design is higher, and the power switch without interannular changes the confession load basically, therefore also power switch can be set at interannular.
The present invention also further advises the transformer circuit installing short circuit current limiter of transformer station and/or the transformer adopting high-impedance transformer of transformer station.Dual mode adopts simultaneously or optional one of which all is fine.The concrete setting is embodied as prior art, and the present invention will not give unnecessary details.
Being explanation effect of the present invention, below is that model is applied in the medium voltage distribution network actual design of Kerry with provided electric power system.Specifically comprise following planning step:
(1) from the actual conditions of electric network composition, status of equipment and operation level analysis city medium voltage distribution network, analyzes the weak spot that exists
A. electric network composition
A) urban distribution network 110kV transformer station wiring 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 analysis
F) holding a year ratio analyzes
G) " N-1 " check analysis
H) the present situation high-voltage fence is carried out trend, short circuit, line loss, voltage levvl analysis
I) power distribution network insulating rate, cable rate are analyzed
J) wire type, cross-section analysis
K) circuit operation time limit analysis
1) line load rate and safe and reliable power supply capacity analysis
M) the distribution transforming load factor is analyzed
N) distribution transforming model, capacity and the analysis of the operation time limit
(2) the domestic and international medium voltage distribution network power supply of investigation model with reference to south electric network distribution network planning guide rule, has proposed to instruct the planning principles of city medium voltage distribution network power supply modelling
A. rack design standardization, modelling:
The design of standardization, modelling can significantly reduce the workload of planning and designing department, makes things convenient for the power distribution network expansion, is beneficial to the realization automation, adopts unified control strategy, and clear and definite networking standard and evaluation system is provided for medium voltage side user's access.
B. modelling should combine urban characteristic:
When specifically designing a model, need to combine urban features, and it being embodied in aspect, landform region to a great extent, is exactly to design according to landform region, city, Paris like typical case's three ring designs in Paris.And Singapore country is less, each department development relative equilibrium, and physical features is low flat for adopting unified plum blossom shape power supply model construction that possibility is provided.
C. model should possess extensibility:
The power supply model should possess good autgmentability, and along with city's development, the continuous extension of load increases, and shows its high flexibility, and this is the unified guarantee of building of electrical network.
D. power distribution network coordinated developments at different levels:
To improve reliability is basic principle, promotes the coordinated development of high, medium and low voltage net; With due regard to load transfer between layer and the layer and support each other make medium voltage distribution network power supply model possess the good load transfer ability
(3) set up the boundary condition of high voltage distribution network, city medium voltage distribution network grid structure model is carried out Preliminary design based on the grid structure theory as research city medium voltage distribution network.Through static security verification, short circuit current level and electromagnetic looped network analysis model is revised.
(4) based on the city medium voltage distribution network wire frame model of setting up, from following 7 aspects it is carried out feasibility analysis respectively, verify its feasibility
A. build feasibility analysis
A) transformer station's compartment analysis
B) line channel analysis
B. load level analysis
C. characteristics of tidal flow
A) transformer station to switching station trend
B) trend between the switching station
D. short circuit horizontal analysis
E. static security analysis
F. fail-safe analysis
G. scalability Analysis
The transformation flow process of city, Kerry power distribution network is as shown in Figure 3:
The first step, city, Kerry power distribution network As-Is analysis: the electrical network As-Is analysis is the basis and the foundation of following power network development, planning, construction.From high voltage distribution network, low and medium voltage distribution network two aspects the Kaili City power distribution network is carried out labor, need in the existing power distribution network to point out the weak link of transformation, instruct the planning and the design of city, Kerry power distribution network.
Present grid structure development of Kerry city network and design nonstandardized technique, there is the present situation that hangs up a Chinese lantern in circuit; The quality of power supply is lower simultaneously, reliability is not high, because power channel and land resource are deficient, the difficulty of newly-increased transformer station is bigger in addition.Make a concrete analysis of as follows:
110kV power network line cross section, Kerry is with 185mm
2Be main, the circuit conveying capacity is not high, and 110kV transforming plant main transformer load factor is higher, and totally 4 can not be satisfied main transformer " N-1 ", fault afterload transfer ability a little less than.The city, Kerry mainly supplies power to the city with the change of T-shaped mouth (becoming in the city), Jin Quanbian, the change of big slope, green hill change, the duck pool 5 110 kv substations of change; Wherein becoming the master with change of T-shaped mouth and Jin Quan supplies power to the down town; Power supply area accounts for 70% of entire city; As long as any station dead electricity,, and receive the restriction of line powering capacity and passage and can't shift power supply the power failure that causes half of city, Kerry.
Kerry 10kV medium voltage distribution network part circuit radius of electricity supply exceeds standard, the circuit of single radiation wiring pattern totally 22 times, and the contact rate is 65.6%, and the N-1 percent of pass is merely 30%, and load changes the confession difficulty when causing fault easily.And the load factor average level of circuit load factor higher, distribution transforming is unbalanced.
Second step; The planning thinking of Kerry urban construction cyclization operation dicyclo power distribution network has been proposed: along with the fast development of China's economy especially urban economy; The contradiction that urban distribution network power supply reliability, the quality of power supply and urban economy development require is more and more outstanding; Wherein, middle pressure grid structure development disorder is one of its major reason.This chapter is guidance summing up on the domestic and international developed country medium voltage distribution network power supply model based with south electric network power distribution network technology guide rule, in conjunction with the actual conditions of Kerry city network, proposes the power supply model planning thinking of city, Kerry power distribution network.
(1) model of the typical power supply of developed country's city power distribution network both at home and abroad
In each subregion of Singapore city, per twice the 22kV feeder lines of transformer station constitute looped network, form petal design, are referred to as plum blossom shape power supply model.Interconnect again in the middle of per two looped networks of different electrical power transformer station, form the tangent shape of petal type.Its network connection is actually by simply connected network in simply connected network and the transformer station between transformer station and combines.Liaison Division separates inscription of loop between standing, contact part operation with closed ring in standing, and the liaison office between two looped networks is most important load place.Constitute the city overall rack of many " plum blossom " power supply, shown good extensibility.
Paris urban distribution network has distinct circulus: outer shroud, middle ring and interior ring, and three rings are divided into 4 subregions again, and each transformer station just is between the subregion, and the transformer station in each ring is to the subregion of both sides.When load increases, can between subregion, increase by a transformer station, subregion is divided into two again, shown good extensibility.
(2) guideline of city medium voltage distribution network power supply model
In conjunction with the enlightenment of the city power distribution network typical case of domestic and international developed country power supply model,, set up the guideline of city, Kerry medium voltage distribution network power supply model in conjunction with south electric network distribution network planning guide rule:
The rack design standardization; Modelling: standardization, modelling design can significantly reduce the workload of planning and designing department, make things convenient for the power distribution network expansion, are beneficial to the realization automation; Adopt unified control strategy, and clear and definite networking standard and evaluation system is provided for medium voltage side user's access.
Modelling should combine urban characteristic: when specifically designing a model, need to combine urban features, and it being embodied in aspect, landform region to a great extent, is exactly to design according to landform region, city, Paris like typical case's three ring designs in Paris.And Singapore country is less, each department development relative equilibrium, and physical features is low flat for adopting unified plum blossom shape power supply model construction that possibility is provided.
Model should possess extensibility: the power supply model should possess good autgmentability, and along with city's development, the continuous extension of load increases, and shows its high flexibility, and this is the unified guarantee of building of electrical network.
Power distribution network coordinated developments at different levels: to improve reliability is basic principle, promotes the coordinated development of high, medium and low voltage net; With due regard to load transfer between layer and the layer and support each other make medium voltage distribution network power supply model possess the good load transfer ability
(3) the planning thinking of city, Kerry medium voltage distribution network power supply model
One of middle most important guideline of pressing the rack design is that modelling should combine urban characteristic; And urban characteristic largely shows on the landform regional feature; And the Load distribution characteristic is again closely linked therewith; For the city, Kerry, its lineament is that the address is smooth, and characteristic of city is a typical interior ring and outer ring structure.When power distribution network is planned, usually all be to come the layout of switching station and network connection branch to carry out.City, Kerry load demonstrates circular distribution along landform, and for the unit power supply model of the circular distribution of load, if adopt the switching station wiring, the unit that it the was suitable for model of supplying power is as shown in Figure 9: be connected back into line with one by interconnection between the switching station.So modeling focus on the switching station layout, between promptly confirming to open and close and and electric substation between the problem of " line " how.
Through analyzing the weak spot of Kerry present situation electrical network; Summing up on the domestic and international developed country medium voltage distribution network power supply model based; In conjunction with the Kerry lineament; Proposition the existing switching station of city, Kerry in 2015 10kV power distribution network utilization with the planning switching station is final form in the theory of looped network and outer looped network, explore simple, unification, rational city medium voltage distribution network wire frame model.The guiding theory of physical planning is following:
1) form with the change of 110kV T-shaped mouth, become the interior looped network at center in the 110kV city of change of the 110kV west of a city and planning, 110kV transformer station is through switching station formation ring network power supply on 10kV outlet to the interior looped network; The 110kV city east change that formation becomes, plans with 110kV Jin Quan, the change of 110kV green hill and the big slope of 110kV become the outer looped network at center, and 110kV transformer station forms ring network power supply through the online switching station of 10kV outlet to outer shroud.
2) directly link to each other from transformer station to the switching station circuit and the switching station circuit by cable, on-load not in principle between the circuit, all loads all go out tape by switching station.
3) private subscribers is by transformer station's direct-furnish
4) backbone partition running, but allow the looped network operation
(4) expection of city, Kerry medium voltage distribution network dual-ring network model power supply effect
1) power supply reliability is high: strengthen the distribution network shelf structure, compare with N-1 wiring hand in hand and can satisfy N-2, lay the foundation for improving power supply reliability; Changing simultaneously loaded in the past has only the phenomenon of one or two power supply point power supply, reduces the risk of city large-area power-cuts.
2) power supply gos deep into load center: 10 kilovolts of buses of 110 kv substations are extended to central concentrated load compact district, city; Realized that the 10kV of transformer station bus integral body is to load side reach power supply; Embodied the principle that power supply gos deep into load center as far as possible; Shorten power distribution network secondary rack radius of electricity supply, for sound assurance is made in quality of power supply management.
3) power supply area is clear: be line loss management in four fens, power distribution automation lay a good foundation.
4) operational mode is flexible: as long as also have one 110 kv substation operation, under other transformer station's decompression situation, this transformer station can provide emergency power supply for entire city.
The 3rd step, the ring-like rack modeling in city, Kerry: i.e. city, Kerry medium voltage distribution network dicyclo rack ring type supply model modeling.Load prediction is the basis of urban power network planning; Its accuracy directly influences the quality of Electric Power Network Planning; According to " Kerry urban distribution network " 12 " planning " and Kerry power supply administration related data; The city, Kerry estimates that load in 2015 will reach 178MW, and wherein interior ring load is 72MW, outer shroud load arrival 106MW.
The medium voltage distribution network modeling of city, Kerry; Mainly comprise two parts; Above high voltage distribution network of city, Kerry 110kV and city, Kerry 10kV medium voltage distribution network; Wherein 110kV above high voltage distribution network in city, Kerry is as the boundary condition of city medium-voltage distribution network operation and the constraints of upper layer network, and city, Kerry 10kV medium voltage distribution network is a research object.The overall flow of modeling is following:
(1) high voltage distribution network modeling
The network that is electrically connected of Kerry area 500kV, 220kV transformer station, 110kV transformer station is only considered in the modeling of high voltage distribution network; Operational mode adopts the large load operation mode, and transformer station's load be the peak load in 2015 target years, load concentration is equivalent arrive the 10kV of 110kV transformer station outlet to the 10kV bus bar side of switching station.
In the 500kV/220kV modeling process, balance node selects the 500kV Shibing to become, and on the basis of the 550kV/220kV grid structure of setting up, carries out the modeling of 220kV/110kV electrical network.
(2) 10kV power distribution network dicyclo rack Preliminary design
Investigation city, Kerry present situation medium voltage distribution network grid structure model; Experience with Paris and Singapore's power distribution network power supply model is a guideline with south net electrical network distribution network planning guide rule; Consider Kerry differentiation load development,, city, Kerry power distribution network is carried out the dual-ring network construction in conjunction with the planning situation (coordinated development of mesohigh power distribution network) of city, Kerry high voltage distribution network; Mainly comprise the grid structure design, design that substation location designs and switching station is layouted.
1) grid structure design
By knowing the analysis of Kerry lineament in second step; The Kerry landform is smooth; The urban structure characteristics are a typical interior ring and outer ring structure, and load demonstrates circular distribution along landform, in conjunction with medium voltage distribution network rack design guidance principle; Use for reference " hand in hand " experience of ring network shelf structure of Paris; On the basis of city, Kerry present situation power distribution network, propose to utilize to have switching station and the final theory that forms interior looped network and outer looped network of planning switching station now, utilizing " hands in hand " between the switching station forms two independently ring type structures.
2) substation location design
Before carrying out the distribution planning and designing; At first the city is carried out the division of power supply area, analyze its load type, load increasing trend; Confirm the quantity of City Substation and the power supply area of transformer station respectively; Not transregional power supply as far as possible makes the power supply area of transformer station clear, for solid foundation is established in the automation of power distribution network.
Distribution situation in conjunction with existing city, Kerry 110kV transformer station; Analyze the load development need of confirming that the city, Kerry is following; Analyze the city, Kerry and need newly-built 2 110kV transformer stations; Therefore city, Kerry target year in 2015 the dicyclo rack power supply have 6, be respectively that 110kV T-shaped mouth becomes, 110kV Jin Quan becomes, the 110kV west of a city becomes, the 110kV green hill becomes, the big slope of 110kV becomes, become in the planning 110kV city and planning 110kV city east becomes.
In ring load by 110kV T-shaped mouth become, the 110kV city east becomes, become in the 110kV city, 110kV Jin Quan becomes and the 110kV west of a city becomes totally 5 110KV transformer stations power supplies.Outer shroud is loaded and is supplied power by 6 110kV transformer stations such as change in the change of 110kV city east, the 110kV city, 110kV Jin Quan change, the change of the 110kV west of a city, the change of 110kV green hill and the big sloping changes of 110kV;
3) the switching station design of layouting
Behind the power supply area of confirming transformer station, in conjunction with load prediction results, internally the power supply area of looped network and outer looped network segments, and each little power supply area is supplied power by a switching station.
Fig. 4 be the preliminary rack figure of Kerry medium voltage distribution network dual-ring network that designed (for figure succinct, every all corresponding two actual loop line roads of circuit among the figure):
In the ring switching station: triumphant return residence switching station, market street switching station, new nine switching stations, city's herding switching station, 262 switching stations, power supply building switching station, rise imperial switching station, cultural South Road switching station, big geaster moon switching station, teachers training school's switching station etc.
The outer shroud switching station: Qingjian River switching station, old cement plant switching station, city build gas station, two company's switching stations, Yongfeng east, Yongfeng switching station, city's landscape switching station, rich southern switching station, face upward the A Sha switching station, school switching station, fork in the road switching station, suburbs office switching station, Qin Yuan hotel switching station, two imperial switching stations, the very best mansion switching station, brewery's switching station etc. are defended in the state.
Also have Shaoshan road switching station, international name to occupy switching station and do not add cyclization in addition.
Be each switching station power supply by 7 transformer stations.
Wherein Kerry city network cable recommendation employing model is YJV-300, the ampacity 485A of this model, and reaching maximum carrying capacity is 8.5MVA, the promptly maximum active power of passing through is 8MW, and with the hot surely limit of this active power as every loop line road.
The rack of this Preliminary design is carried out characteristics of tidal flow analysis, static security analysis, and (distribution belongs to and is held network; Do not have temporarily steady problem) and the short circuit horizontal analysis; Can know; The circuit trend that this rack institute on-load satisfies the load prediction value in target year, normal operation is no more than the steady limit of heat, the medium voltage distribution network circuit all satisfies N-1; Be that characteristics of tidal flow and static security analysis all can meet the demands, but the short circuit current maximum of city power distribution network have the blocking level of circuit breaker 20kA now up to 56.75kA considerably beyond the city, Kerry.
(3) correction of 10kV dual-ring network grid structure
Short circuit current is excessive to be the key factor of restriction city, Kerry dicyclo electrical network cyclization operation, and through the analysis to the electromagnetic looped network operation, short circuit current is excessive mainly to be because the dual-ring network loop is more, provides the power supply point of short circuit current more.So consider from improving the grid structure angle, reduce the short circuit level and mainly contain following two aspects: the one, reduce the electric pressure that electromagnetic looped network moves, to reduce electric pressure in the loop as far as possible; Secondly, propose the inner and outer ring independent operating, ring perhaps only supplied the correction thought of outer shroud switching station in 110kV transformer station only supplied.Thought in view of the above; Kerry medium voltage distribution network dual-ring network correction rack figure shown in Figure 5 has been proposed: adjusted the line between transformer station and switching station, switching station and the switching station during correction; It only is interior ring power supply that change in for example west of a city change, the city, T-shaped mouth become, and city east change, Jin Quan change only are the outer shroud power supply.
Carry out characteristics of tidal flow analysis, static security analysis and short circuit horizontal analysis to revising the back rack; Can know; The circuit trend that this rack institute on-load satisfies the load prediction value in target year, normal operation is no more than the steady limit of heat, the medium voltage distribution network circuit all satisfies N-1; Be that characteristics of tidal flow and static security analysis all can meet the demands, but the short circuit current of city power distribution network still reaches 40.43kA, still surpass the blocking level of the existing circuit breaker 20kA in city, Kerry.
So far can know that seeking the measure that reduces short circuit current level is the key that city, Kerry dicyclo rack adopts the cyclization operation.Conventional current limiting measures have: the operation of electrical network layering and zoning, and the power supply connecting system mode of making rational planning for improves electric pressure and development direct current transportation; Draw guard's valve, circuit, transformer station adopts the bus split operation, adopts high impedance device and installs short circuit current limiter additional.Preceding four kinds belong to from changing the current limiting measures that the electric network composition aspect is considered, will produce bigger influence because of changing electric network composition to the Guizhou electrical network, thus will not with employing.And draw the re-set target of guard's valve, circuit and raising distribution network reliability opposite, so do not adopt yet.
Adopt the bus split operation, adopt high impedance device and install additional on the basis of three kinds of measures of short circuit current limiter using for reference transformer station; To increase system impedance is purpose; The current limiting measures of switching station bus section operation have been proposed first; And adopt bus split operation with the operation of switching station bus section and be called the operational mode that changes medium voltage distribution network the transformer station, so next install the short circuit current (not considering the transient process of short circuit) that three kinds of measures of short circuit current limiter can effectively reduce system additional from operational mode, transformer station's employing high-impedance transformer and transformer station that principle is proved the change medium voltage distribution network.
1) operational mode of change medium voltage distribution network increases system impedance
Substation bus bar fanout operation, the operation of switching station bus section all can obviously increase system impedance, effectively reduce short circuit current.The operational mode that both mix more can effectively reduce short circuit current.
Following qualitative analysis substation bus bar apportion and the bus sectional lized hybrid operation mode of switching station are to the control action of short circuit current.With the system shown in Figure 8 structure is example: comprise the A of transformer station, switching station A, the B of transformer station, switching station B; Short circuit current in the time of can changing the female outlet generation of the II three-phase shortcircuit of switching station A after the operational mode of medium voltage distribution network is significantly less than the short circuit current that changes before the medium voltage distribution network operational mode, concrete analysis as follows:
Before changing the operational mode of medium voltage distribution network:
After changing the operational mode of medium voltage distribution network:
Wherein, I
fThe short circuit current at (like f place among the figure) when referring to the female outlet generation of the II three-phase shortcircuit of switching station A, E
1, E
2The equivalent electromotive force that refers to two power supply points, Z
T11, Z
T12, Z
T21, Z
T22Refer to the equiva lent impedance of substation transformer, Z
L11, Z
L12, Z
L21, Z
L22Refer to the circuit equiva lent impedance of transformer station, Z to switching station
12Refer to the equiva lent impedance of the continuous circuit of switching station.
2) adopt high-impedance transformer to increase system impedance
The short circuit current of 110kV transformer 10kV low-pressure side and the short circuit current of 10kV subregion electrical network all will pass through from the transformer of 110kV transformer station.With equivalent circuit diagram shown in Figure 8 is example, short circuit current and transformer impedance Z when the female egress line of the II of switching station A is short-circuited
TBe inversely proportional to, make a concrete analysis of as follows:
During the transformer adopting high-impedance transformer, Z
T11//Z
T12And Z
T21//Z
T22All will increase, and then cause I
fReduce.Therefore select the short circuit current that high-impedance transformer can control system for use.
3) adopt current limiting reactor to increase the impedance of system
The short circuit current of 110kV transformer 10kV low-pressure side and the short circuit current of 10kV subregion electrical network all will pass through from the transformer of 110kV transformer station.Be example with the system shown in Figure 8 structure equally, short circuit current and transformer circuit impedance when the female egress line of the II of switching station A is short-circuited are inversely proportional to, and the short circuit current before the transformer circuit of 110kV transformer station installs current limiting reactor additional is following:
Short circuit current expression formula after the transformer circuit of 110kV transformer station installs current limiting reactor additional is following:
Z wherein
KThe resistance value that refers to the current limiting reactor of the inner installing of transformer station.
Clearly, install the short circuit current that current limiting reactor can control system additional at the transformer circuit of 110kV transformer station.
Can know that by above analysis above-mentioned 3 kinds of measures all can effectively reduce the short circuit current of electrical network, promptly
1) operational mode that adopts the change medium voltage distribution network is to increase system impedance;
2) adopt high-impedance transformer to increase system impedance
3) adopt current limiting reactor to increase the impedance of system
Separately with 1) when being used for the dicyclo rack cyclization moving model of city, Kerry reality, can know that this moment, the maximum short circuit current of city, Kerry 10kV power distribution network will reach 27.36kA, had exceeded the breaking capacity of existing circuit breaker 20kA through the PSASP simulation calculation.So independent employing method 1) and fail to effectively reduce short circuit current to reasonable levels.
Separately with 2) when being used for the actual dicyclo rack cyclization moving model in city, Kerry,, need to adopt perunit value X for the maximum short circuit current with city, Kerry 10kV power distribution network is restricted to the level of 20kA
T*=1.4 three-phase winding transformer, head and shoulders above X
T*So normal level about=0.25 is independent employing method 2) also infeasible.
Separately with 3) be used for the actual dicyclo rack cyclization moving model in city, Kerry, when adopting PSASP to carry out simulation calculation, through increasing the mode of line reactance, the installation of simulation current limiting reactor.For the whole short circuit level that realizes looped network drops to 20kA, the reactor perunit value in the emulation is made as X
K*=1.2.The circuit model of dual-ring network structure is YJV-300, and corresponding maximum carrying capacity is 485A, and then the rated current of current limiting reactor is taken as 485A.Substitution percentage reactance computing formula gets:
In the formula, Ub-reference voltage, kV
The Sb-reference capacity, MVA
U
NKThe rated voltage of-reactor, kV
I
NKThe rated current of-reactor, kA
X
K%-reactance percentage value
Loss of voltage verification:
During operate as normal, the loss of voltage of reactor must not be greater than 5% of rated voltage.The computing formula of the loss of voltage is following
In the formula, I
GmaxThe lasting maximum operating currenbt of-reactor, A
X
KThe resistance value of-reactor
With the percentage reactance substitution loss of voltage verification that calculates,
So independent employing method 3) also unreasonable.
So must employing method 1) to method 3) combination carry out the restriction of city, Kerry short circuit current; Can know through example emulation; Method 1) not only cost is low with the method that increases system impedance for the operational mode that changes medium voltage distribution network; And the short circuit current restriction effect is fabulous, thus the essential braking measure of short circuit current during as city, Kerry dicyclo rack cyclization operation, so proposed the combination of following three kinds 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 to be referred as three kinds of schemes be:
Scheme one: install current limiting reactor additional in 110kY transformer station loop;
Scheme two: adopt high-impedance transformer;
Scheme three: adopt high-impedance transformer simultaneously and install current limiting reactor additional at the transformer circuit of 110kY transformer station.
Three kinds of schemes all can effectively be reduced to 20kA with short circuit current through choosing reasonable parameter, and the voltage loss of simultaneity factor, power loss, voltage levvl etc. also all can meet the demands.Table 1 carries out concise and to the point qualitative analysis from the economy angle to three kinds of schemes, on the basis of satisfying power grid security, reliable and stable operation, recommends employing scheme one in the dicyclo rack annular electric supply of city, Kerry.
So city, the Kerry medium voltage distribution network dicyclo rack cyclization moving model that proposes is still as shown in Figure 5; But internal structure has been variation as shown in Figure 6: Fig. 6 and has been become with the big slope of outer shroud that to become power supply area with the city east be the inner connecting structure figure that example has provided part transformer station to switching station and switching station to switching station, and the bus I of the big slope change of 110kV 10kV side supplies power with bus I and the II that II is connected Qingjian River switching station, the very best mansion switching station, brewery's switching station respectively; The bus I that the 110kV city east becomes the 10kV side and II be connected respectively Qin Yuan hotel switching station, two imperial switching stations, suburbs office switching station, fork in the road switching station, state defend the school switching station bus I and II supply power; Ring-type connects between the same section bus of each switching station.Wherein the inner segmentation bus connection switch of switching station breaks off, and female couplet of the 10kV side of 110kV transformer station breaks off.City, Kerry final dicyclo rack cyclization operation electric power system sketch map is as shown in Figure 7, has comprised the dicyclo rack of outer shroud and interior ring.
The 4th step; City, Kerry dicyclo rack cyclization operation Feasibility Analysis of HV and LV: grid structure is the muscles and bones of medium voltage distribution network; Strong rack is the basis of reliable, the economic high-quality operation of power grid security; Therefore whether grid structure is strong, whether can stand to take place in the system test of big disturbance, becomes the deciding factor that can the planning rack put into operation.Next from construction feasibility, Load distribution, characteristics of tidal flow, short circuit current level, static security analysis and fail-safe analysis, 7 aspects of scalability Analysis city, the Kerry dicyclo rack cyclization moving model that is proposed is analyzed.
(1) builds feasibility
Foundation associated documents such as " Kerry urban distribution network " 12 " planning " utilize situation analysis at interval to the 110kV transformer station outlet of the grid structure that city, Kerry in 2015 is built up; As shown in table 2; The interval average utilization of 7 transformer stations in 2015 is 52.4%; Maximum interval utilance is 75% of city east change, so meeting the demands fully at interval appears in seven 110kV transformer stations to the city power supply in 2015.
The looped network wiring channel feasibility of the grid structure of city, Kerry in 2015 being built up according to associated documents such as " city, Kerry in 2013 high pressure power distribution network circuit gallery demand distribution figure " and " medium-voltage distribution of city, 11 days-Kerry March in 2010 geographical winding diagram " is analyzed, and the result shows that this looped network can build.
(2) Load distribution
City, Kerry load in 2015 is estimated to reach 178MW, and the distribution situation of forecast demand is that interior ring load reaches 72MW, and the outer shroud load reaches 106MW.The dual-ring network structure power supply model that problem designed has been recommended a class value to the load of inner and outer ring on the basis of satisfying static trend safety analysis; But ring switching station on-load 90MW tackles the extreme case of city, following Kerry at sudden load increase 18MW in 2015 promptly; Outer shroud switching station on-load 132MW.The concrete condition of each switching station of inner and outer ring is as shown in table 3.
(3) characteristics of tidal flow
City dual-ring network power supply has 7, and 110kV transformer station has 66 to the switching station circuit.Wire type recommends to use the YJV-300 model, the ampacity 485A of this model, and the maximum load amount is 8.5MVA, the maximum active power of passing through is 8MVA (being not more than 0.95 by power factor).Table 4 has provided transformer station and has distributed to the trend of switching station single back line, but is 5.537MW by the maximum active power in table notice of invitation loop line road, is no more than 8MW, satisfies the steady limit of heat of circuit.The trend of single back line distributes as shown in table 5ly between the switching station, and the strength of current of circuit is 3.477MW between the switching station, equally also is no more than 8MW, satisfies the steady limit of heat of circuit.
(4) short circuit current level
The dual-ring network that city, Kerry 110kV transformer station low-voltage bus bar side is installed additional behind the current limiting reactor carries out the three-phase shortcircuit analysis, and the result is as shown in table 6 in concrete analysis, and its median generatrix famous-brand clock shows the bus that three-phase shortcircuit takes place.Can find out that short circuit current was maximum when this moment, Jin Quan became 10kV bus generation three-phase shortcircuit, was 16.94kA, but still satisfied the requirement of circuit breaker 20kA connecting-disconnecting function.
(5) static security analysis
After Kerry power plant closed down in 2009, city, Kerry power distribution network was one and typically held electrical network, so city network do not exist angle stability and transient stability problem, so the strong property of Kerry city network is mainly considered its static security problem.
Choose power between the switching station and surpass power surpasses 5MW between 3MW and transformer station and the switching station circuit, it is carried out static security analysis respectively as considering object (table 7).The result shows that all circuits all satisfy the N-1 verification, and wireless passing by carried (the meritorious 8MW of surpassing is the verification standard with no circuit behind the N-1).The 10kV bus---cultural South Road opens and closes the example of doing to become in the city; Variable power is as shown in table 8 above the circuit of 1MW in the network of N-1 fault front and back; Maximum variable quantity is 2.843MW; Line power is as shown in table 9 greater than all circuits of 4MW behind the N-1, and the maximum active power of circuit is 5.686MW, satisfies the thermally-stabilised limit of circuit.
(6) fail-safe analysis
Economy and reliability are two very important indexs of electric power system, but also are two conflicting indexs simultaneously.At present both at home and abroad very many research has all been carried out in this two aspect, but it is few to take all factors into consideration both research, this analysis has combined reliability and two indexs of economy that city, Kerry dicyclo rack cyclization moving model is assessed.
The Kerry city network adopts cyclization operation operation with closed ring mode can reduce the power failure scope and time effectively, improves power supply reliability, increases amount of power supply.Adopt this operational mode, can utilize existing Internet resources fully, make the user obtain two or more power supply power supplies, in the reliability that has improved power supply, also saved investment greatly.
Show based on the reliability assessment model of minimal path collection minimal cut set with based on the economic evaluation model analysis that always has expense; The medium voltage distribution network dual-ring network model cyclization of city, Kerry operates to the optimum power supply plan of reliability economy; This moment, power supply reliability was 99.998510%; Compare 99.994% (our inner city of correspondence) in Paris; 99.9914% of Tokyo 99.9914%, London, the power supply model reliability economy that the present invention proposes has reached advanced international standard.
To sum up, from building the feasibility angle analysis, this grid structure is feasible in engineering construction, and the load capacity of the internal and external double-circular of this moment also satisfies the workload demand that city, Kerry in 2015 increases fully.Simultaneously,, can know that this rack trend distributes rationally, the short circuit level is reasonable, can satisfy the N-1 verification from the PSASP simulation result through this city, Kerry dual-ring network is carried out characteristics of tidal flow analysis, short circuit current analysis and static security analysis.It is last that dual analysis and assessment show weight power distribution network dicyclo rack cyclization moving model in city, Kerry proposed by the invention not only construction cost are low but also reliability has reached advanced international standard based on the economy reliability.Therefore from building the angle of feasibility, workload demand, trend, short circuit, static security analysis and fail-safe analysis, it is feasible that city, Kerry dual-ring network carries out the cyclization operation.
(7) scalability Analysis
Can know by city, accompanying drawing 7 Kerry dicyclo rack cyclization moving model sketch map; City, the Kerry medium voltage distribution network dicyclo rack cyclization power supply model that is proposed has very strong independent autgmentability; Continuous expansion along with the city; Can be that ring expansion construction is pursued at the center with the urban district, and each independently ring-like power distribution network can also support each other when fault, make city, Kerry power distribution network compare both at home and abroad existing medium-voltage distribution pessimistic concurrency control more " strong ", " reliably ".
Three kinds of scheme economic comparison of city, table 1 Kerry dicyclo rack cyclization moving model
City, table 2 Kerry dicyclo rack cyclization moving model transformer station utilizes situation at interval
City, table 3 Kerry dicyclo rack cyclization moving model inner and outer ring switching station Load distribution
City, table 4 Kerry dicyclo rack cyclization moving model transformer station to switching station trend distributes
Trend distributes between city, table 5 Kerry dicyclo rack cyclization moving model switching station
City, table 6 Kerry dicyclo rack cyclization moving model three-phase shortcircuit result
City, table 7 Kerry dicyclo rack cyclization moving model waits to do the circuit of N-1
Variable power surpasses the circuit of 1MW in the network of table 8N-1 fault front and back
Line power is greater than the circuit of 4MW behind the table 9N-1
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (4)
1. city medium-voltage distribution network closed loop electric power system based on ring-like rack is characterized in that: be provided with the ring-type rack that comprises 1 or above ring; Each is equipped with 1 or above transformer station and 2 or above switching station, and each switching station inside is provided with bus I and the II that connects through bus connection switch, and the 10kV side of each transformer station is provided with bus I and the II that connects through bus connection switch; Connected mode in each ring does; The bus I of all switching stations connects and composes independently inner subring I in the ring; The bus I that is connected to switching station through the bus I with transformer station is inner subring I power supply; The bus II of all switching stations connects and composes independently inner subring II in the ring, and the bus II that is connected to switching station through the bus II with transformer station is inner subring II power supply; During normal the operation, all bus connection switches of connection bus I and II all are off-states in each ring.
2. according to the said city medium-voltage distribution network closed loop electric power system of claim 1, it is characterized in that: be provided with the ring-type rack that comprises 1 ring, comprise the A of transformer station, B and switching station A, B, C, D in the ring based on ring-like rack;
The bus I of switching station A, B, C, D link to each other to constitute independently inner subring I, the power supply that links to each other with the bus I of switching station A, B of the bus I of the A of transformer station, the power supply that links to each other with the bus I of switching station C, D of the bus I of the B of transformer station; The bus II of switching station A, B, C, D link to each other to constitute independently inner subring II, the power supply that links to each other with the bus II of switching station A, B of the bus II of the A of transformer station, the power supply that links to each other with the bus II of switching station C, D of the bus II of the B of transformer station.
3. according to claim 1 or 2 said city medium-voltage distribution network closed loop electric power systems, it is characterized in that: the transformer circuit installing short circuit current limiter of transformer station and/or the transformer adopting high-impedance transformer of transformer station based on ring-like rack.
4. according to claim 1 or 2 said city medium-voltage distribution network closed loop electric power systems based on ring-like rack; It is characterized in that: when being provided with the ring-type rack that comprises 2 or above ring; Link to each other through power switch between the ring, when normally moving, all power switches between the ring are off-states.
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Application publication date: 20120725 |