CN106505576A - A kind of urban high voltage distribution network load based on Link path turns to supply method - Google Patents
A kind of urban high voltage distribution network load based on Link path turns to supply method Download PDFInfo
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- CN106505576A CN106505576A CN201611132297.2A CN201611132297A CN106505576A CN 106505576 A CN106505576 A CN 106505576A CN 201611132297 A CN201611132297 A CN 201611132297A CN 106505576 A CN106505576 A CN 106505576A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
Abstract
The present invention relates to load turns to supply field, particularly a kind of urban high voltage distribution network load based on Link path turns to supply method, comprises the following steps：S1, divides the domain in high-voltage distribution network, to each node serial number；The domain includes power domain and electric transforming unit domain；S2, with each electric transforming unit as root node, concentrates search supply path from supply path, and forms corresponding power supply collection, power supply unit collection, link paths collection, determine power supply link set initial value；S3, builds constraints and object function；S4, solves power supply selective factor B；S5, according to power supply selective factor B result, forms load turning solution.The method need not enumerate all possible connection combination, only line search need to be entered from each load side, then be shown with the form of set, be effectively reduced load and turn the dimension for problem, calculating speed is improve, urban high voltage distribution network load is widely used in and is turned the on-line analyses for problem.
Description
Technical field
The present invention relates to load turns to supply field, particularly a kind of urban high voltage distribution network load based on Link-path turns
For method.
Background technology
With economic fast development, industrial and electricity consumption of resident grows with each passing day.Load side dispatched to the reliability of electrical network, fast
Quick-recovery is powered etc. and to propose high requirement.But the construction of city 110kV high voltage distribution networks but with practical development some take off
, there is many inside and outsides such as supplying channels restriction, drop point deficiency in section, urban distribution network 220kV substation capacitys are not enough or negative
The uneven problem of lotus distribution is increasingly highlighted, and load peak period, grid dispatching center need to make timely switching manipulation decision-making
To realize fast and effectively load transfer.But due to lacking effective on-line analyses instrument, plan is supplied based on turning of gathering of experience or examination
The requirement that meet distribution economical operation, reliability is slightly difficult to, thereby increases and it is possible to there is potential operation risk.
Load transfer is realized between each transformer station or feeder line by the open/close status of change block switch and interconnection switch
The transfer of load, so as to affect the trend of network, is finally reached the purpose of electric power netting safe running optimization, and load transfer is substantially
The multiple target large-scale nonlinear combinatorial optimization problem of a belt restraining, typically a kind of with reach a certain or multinomial performance or
The optimum 0-1 mixed-integer programming models of index.At present, for the research of load transfer mostly concentrates on low and medium voltage distribution network layer
Face, the control strategy research for high voltage distribution network feature are less, are mostly reducing via net loss, ensure power supply reliability, electricity
Pressure optimization and load balancing etc. often for incidence matrix and are based on figure as target, the network topology model relied on by which is solved
By the tree-model of thought, the decision variable comprising branch switch, feeder line segmentation etc. is chosen for control variable, conventional optimization
Derivation algorithm includes the mathematical optimization side for representative such as the heuristic such as branch exchange method and optimal load flow method, dynamic programming
The intelligent algorithm such as method and genetic algorithm, particle cluster algorithm or their corresponding improvement.However, high voltage distribution network as defeated, match somebody with somebody
Net transition connection pith and there is special structuring difference, both there is 220kV ring network structures, there is 110kV spokes again
The high voltage distribution network (such as Fig. 1) of shape structure is penetrated, generally big load receiving end type network, itself lacks controllable generation assets, its
The obstructive root canal of more than 220kV transmission of electricity mesh portions is turned with the load reconstructed based on 110kV high voltage distribution networks mainly by load management and control
For realizing, said method is not simultaneously applied to.
For high voltage distribution network, had in prior art has considered the planning of 220kV substation capacitys and 110kV distributions
Layout of roads, establishes 2 stage models of high voltage distribution network optimization planning；Have based on improving high voltage distribution network power supply capacity
Angle, the voronoi figures for further providing power supply area are divided and meet the main transformer contact pass of net capability requirement
It is matrix.But the increase with dimension, the increase of the high openness and search difficulty of matrix in said method can be given and be solved
Algorithm brings and has a strong impact on, and conventional intelligent algorithm is also difficult to ensure that high dimensional nonlinear problem stability of solution and asks for efficiency.
On the other hand, research worker employs a kind of high voltage distribution network electric transforming unit group topological representation method, inside unit group
The packet reconstruct of unit group realized by feasible topology status collection.By the Network congestion based on defined load balancing function for building
The power load distributing inequality of Controlling model effective control peak time urban distribution network appearance, local Congestion situation；Or adopt
A kind of bilevel optimization model, is distributed guiding in advance by upper layer network burden with power, and lower floor implementing result feeds back to upper strata assessment
Interactive Solving strategy, make power load distributing gradually tend to rational equilibrium state.But the two all employs particle cluster algorithm and asks
Solution, for the high voltage distribution network non-depth characteristic of multi-ring state on a large scale, equally exists and may produce a large amount of infeasible solutions, can not exist
The slower problem of ripe convergence and convergence rate.
Content of the invention
It is an object of the invention to the above-mentioned deficiency in the presence of overcoming prior art, there is provided a kind of based on Link-path
Urban high voltage distribution network load turn supply method.
It should be noted that operation of urban distribution network obstruction generally occurs in peak period, load or will occur compared with
Significantly transition, turns very low for the cycle interior probability for occurring again significantly to change.Additionally, different from medium voltage distribution network, high pressure is matched somebody with somebody
Network load fluctuation predictability is strong, either in main transformer weight, overload still in case of a fault, load occurs during its turn of confession
The probability of large area mutation is very low, and therefore during turning to supply, load peak-peak can be considered predicted definite value.The present invention is directed to
Regulating strategy is taken to give mitigation under the scene that will be transfinited, it is assumed that the peak load in object time section is invariable, and
Ignore the network loss of 110kV transmission lines of electricity.
In order to realize foregoing invention purpose, the invention provides technical scheme below：
A kind of urban high voltage distribution network load based on Link-path turns to supply method, comprises the following steps：
S1, divides the domain in high-voltage distribution network, to each node serial number；The domain includes power domain and electric transforming unit
Domain；
S2, with each electric transforming unit as root node, concentrates search supply path from supply path, and forms corresponding power supply
Power supply collection, power supply unit collection, link paths collection, determine power supply link set initial value；Wherein, the supply path collection of electric transforming unit is referred to
All set of paths that is powered to the electric transforming unit by power supply；The power supply collection of electric transforming unit refer to all can be to the power transformation
The power supply set that unit is powered；The power supply unit collection of power supply refers to all electric transforming unit set that can obtain power supply from the power supply；
The interconnector existed between electric transforming unit electric transforming unit adjacent with adjacent power or two forms a power supply link, all of
Power supply link constitutes power supply link set；Each power supply link belongs to one or more supply paths, all comprising the power supply link
Supply path become the link paths collection of the power supply link；
S3, builds constraints and object function；
S4, solves power supply selective factor B, and the power supply selective factor B and supply path are corresponded, the power supply select because
When subvalue is 1, represents and select power supply to power for the electric transforming unit, be worth for 0 when represent；
S5, according to power supply selective factor B result, forms load turning solution.
Further, the supply path collection also includes available circuit.
Further, it is contemplated that urban distribution network path is not deep, the supply path collection is according to original wiring diagram and using deep
Degree preferential search method obtain.
Further, in the same manner, said supply unit collection is obtained according to original wiring diagram and using Depth Priority Searching.
Further, the power supply factor is variable to be solved, there is one-to-one relationship with the supply path, is one
Individual 0-1 variables.
Further, the power supply link also includes the interconnector that bus connection switch is constituted in transformer station.
Further, the constraints include single supply power constraint, loading demand constraint, capacity-constrained, exempt to bridge
Constraint, switch motion count constraint and 220kV network trend constraints.
(1) single supply is powered constraint
During load transfer adjustment, the radial structure of 110kV networks, i.e. each electric transforming unit should be maintained all the time only
Can be powered by a 220kV power supply, it is impossible to by multiple while powering and forming looped network.
(2) loading demand constraint
Load transfer should meet the power demand of each electric transforming unit.
(3) capacity-constrained
The actual capacity that each 220kV power supply is confessed is no more than its maximum capacity；
110kV transmission line capacity-constraineds.
(4) exempt from bridging constraint
Exempting from bridging constraint implication is：For the electric transforming unit connected between two 220kV power stations, the power supply of each electric transforming unit
Path can not overlap.
(5) switch motion count constraint
For ensureing that the radioactivity of 110kV networks, the " closed " of power distribution network breaker in middle, "off" behavior always occur in pairs,
One action group of synthesis, referred to as one time switch motion number of times.By the power supply link set obtained in optimization process and power supply link set
Initial state carry out contrast switch motion number of times be obtained.
(6) 220kV networks trend constraint
Turn for during, after 220kV power stations are determined with 110kV power stations annexation, actual the connect load in 220kV power stations
(referring mainly to burden with power) also determines therewith.Consider that high voltage distribution network reactive power support is general more sufficient, it can be considered to
Using DC power flow computation model, and voltage security can be calculated check when the sequence of operation judges.
Further, when in transmission line section failure or 220kV stations, transformator off-load runs, generally require to cut off one
Fixed load is meeting the service requirement of electrical network.For electric transforming unit, introduce load and cut off scale factor, the load cuts off ratio
The example factor is between (0,1), corresponding loading demand constraint introduces load and cuts off scale factor.
Further, the object function includes harmonious optimization object function and cuts off loading minimum optimization aim letter
Number.
Specifically, load balancing degree B is to weigh high voltage distribution network economy, an important indicator of safe operation, uses load
The mean square deviation of rate portraying load balancing degree, including power supply load balancing degree BsWith line load equilibrium degree Bl, represent and deviate averagely
The size degree of rate of load condensate, its value are more little more balanced, power supply load balancing degree BsWith line load equilibrium degree BlWeighted sum can be obtained
Arrive system finishing weighted balance degreeAnd ω1+ω2=1.
Wherein, power source loads equilibrium degree：
Line load equilibrium degree：
Wherein：NsFor the number of 220kV power supplys, NlFor all 220kV transmission lines of electricity numbers,WithPoint
Not Wei 220kV power supplys and 220kV transmission lines of electricity rate of load condensate,Pli.max、PliFor 220kV
The maximum allowable transmission capacity of multi-line power transmission circuit i, actual transmissions capacity.
For so that network load equilibrium degree is in reasonable level, the harmonious optimization object function adopted by load transfer just like
Lower selection：
(1) consider the load balancing of power supply：
Take ∞-norm：
Take 2- norms：
(2) consider the load balancing of transmission line：
Take ∞-norm：
Take 2- norms：
Further, the load for introducing each electric transforming unit in foregoing teachings cuts off scale factor, here to system entirety
Cutting load amount illustrate.The workload demand amount in 110kV power stationsKnown, turn for the load total amount of rear reservation be：
For making excision loading (percent) minimum, the optimization object function for adopting for：
Further, objective optimization function includes above-mentioned F1And F2, in the situation for not considering to cut off load, system optimization letter
Number F=F1；When consideration cuts off the situation of load, actual load turns confession and can consider above-mentioned two main optimizing index, can adopt
With combinations thereof, i.e.,：
MinF=ε1F1+ε2F2
ε1、ε2For weight factor, ε1+ε2=1, its value is flexibly selected according to practical situation.
Further, the load transfer Optimized model due to setting up is mixed-integer programming model containing 0-1 variables, its line
Property degree relatively low, herein using branch and bound method solve.
Compared with prior art, beneficial effects of the present invention：.
The urban high voltage distribution network load based on Link-path that the present invention is provided turns to supply method, matches somebody with somebody for city high pressure
The characteristics of electrical network, the high voltage distribution network load transfer model based on Link-path is established, which is that mixing containing 0-1 variables is whole
Number plan model, is solved using branch and bound method.The method need not enumerate all possible connection combination, only need to bear from each
Lotus side is set out into line search, then is shown with the form of set, effectively reduces the dimension that load turns to supply problem, improves calculating speed
Degree, is widely used in urban high voltage distribution network load and turns the on-line analyses for problem.
Further, load obstructing problem of the present invention for the peak time of urban high voltage distribution network, proposes corresponding
Load transfer optimization method, solves following two problems：
(1) optimized and revised between 110kV power stations and with the annexation between 220kV power stations, meeting each item constraint
Under conditions of carry out load transfer operation, eliminate some main transformers heavy duties or overload operation in peak period system, farthest
Load balancing, and suitable control switching manipulation amount is realized, reduces switching loss；
(2) there is N-1 failures in consideration 220kV systems (as circuit breaking or failure, single transformer maintenance or failure are moved back
Go out) in the case of, dead electricity load is transferred on other available power stations, the importance of load to be considered simultaneously ensures to cut off to bear as far as possible
Lotus amount is minimum.
Description of the drawings：
Fig. 1 is background technology high pressure power distribution network Topology figure；
Fig. 2 is 1 basic electric transforming unit structural representation of the embodiment of the present invention；
Fig. 3 is 1 electric transforming unit structural representation of the embodiment of the present invention；
Fig. 4 exempts from bridging constraint exemplary plot for the embodiment of the present invention 1；
Fig. 5 is that the load of the embodiment of the present invention 1 turns to supply method flow diagram；
Fig. 6 is embodiment of the present invention 1220kV high tension distribution system topological structure schematic diagram；
Fig. 7 is embodiment of the present invention 1110kV high tension distribution system topological structure schematic diagram；
Fig. 8 is the 220kV power stations equilibrium Adjustment effect figure under 1 different scenes of the embodiment of the present invention；
Fig. 9 is circuit rate of load condensate scattergram under 1 different control models of the embodiment of the present invention；
Figure 10 is 220kV transformer stations load level scattergram under 1 different scenes of the embodiment of the present invention；
(Figure 10 a are to limit 220kV transformer stations load level scattergram without switching manipulation number of times；
Figure 10 b are 6 220kV transformer stations load level scattergrams of switching manipulation number of times；
Figure 10 c are without 4 220kV transformer stations load level scattergrams of switching manipulation number of times；)
Figure 11 is the 220kV power stations equilibrium Adjustment effect Fig. 1 under 2 different scenes of the embodiment of the present invention；
Figure 12 is the 220kV power stations equilibrium Adjustment effect Fig. 2 under 2 different scenes of the embodiment of the present invention.
Specific embodiment
With reference to test example and specific embodiment, the present invention is described in further detail.But this should not be understood
Scope for above-mentioned theme of the invention is only limitted to below example, and all technology that is realized based on present invention belong to this
The scope of invention.
Embodiment 1
Basic electric transforming unit of the present invention, its effect is that electric energy is sent to low-pressure side from high-pressure side, refers specifically to
In 110kV systems, electric energy is transferred to the equipment group of low-pressure side from high-pressure side in high voltage distribution network transformer station, is mainly included
110kV main transformers, high pressure bus, transformator senior middle school compress switch, disconnecting link, are represented with letter U.As shown in Fig. 2 letter P represents this
The active power of electric transforming unit transmission.When transformator is in presence, it is effective electric transforming unit.Electric transforming unit more pays close attention to biography
Defeated active power and its supplying channels of connection, in urban high voltage distribution network, have in 110kV transformer stations actual motion many
Typical operation modes are planted, can be described using electric transforming unit, therefore the present invention is described using this functional unit pattern, Fig. 3
For certain city partial high pressure power distribution network electric transforming unit structural representation.Furthermore, it is contemplated that urban high voltage distribution network reactive-load compensation feelings
Condition is good, is to simplify problem, only considers the equalization problem of burden with power herein.In figure 3, UiRepresent functional unit；SiRepresent
220kV power supply points (transformer station)；Dotted line represents the supply path in resting state, including bus connection switch in transmission line of electricity and station
Two kinds standby.
A kind of urban high voltage distribution network load based on Link-path turns to supply method, as shown in figure 5, comprising the following steps：
S1, divides the domain in high-voltage distribution network, to each node serial number；The domain includes power domain and electric transforming unit
Domain；
S2, with each electric transforming unit as root node, concentrates search supply path from supply path, and forms corresponding power supply
Power supply collection, power supply unit collection, link paths collection, determine power supply link set initial value；Wherein, the supply path collection of electric transforming unit is referred to
All set of paths that is powered to the electric transforming unit by power supply；The power supply collection of electric transforming unit refer to all can be to the power transformation
The power supply set that unit is powered；The power supply unit collection of power supply refers to all electric transforming unit set that can obtain power supply from the power supply；
The interconnector existed between electric transforming unit electric transforming unit adjacent with adjacent power or two forms a power supply link, all of
Power supply link constitutes power supply link set；Each power supply link belongs to one or more supply paths, all comprising the power supply link
Supply path become the link paths collection of the power supply link；
S3, builds constraints and object function；
S4, solves power supply selective factor B, and the power supply selective factor B and supply path are corresponded, the power supply select because
When subvalue is 1, represents and select power supply to power for the electric transforming unit, be worth for 0 when represent；
S5, according to power supply selective factor B result, forms load turning solution.
Related notion in turning the load for method with reference to Fig. 3 is further elaborated,
1. domain, including power domain and electric transforming unit domain, wherein：
Power domain is：S ∈ S, represent the set of all 220kV power supplys, S={ A, B, C } in Fig. 3 in the present invention；Power transformation list
First domain be u ∈ D, the set comprising all 110kV power stations, D={ a, b, c, d, e, f } in Fig. 3.
2. supply path collection (Path)
The supply path collection of electric transforming unit u refers to for any s ∈ S, all paths by powering from s to electric transforming unit u
(comprising available circuit) set, uses symbol Pu={ PsuRepresent, it is contemplated that urban distribution network path is not deep, PuSet element is maximum
With regard to more than ten, typically can obtain according to original wiring diagram and using Depth Priority Searching, for example, for the power transformation list of Fig. 3
First a and e have, Pa={ PAa,PCa}、Pe={ PAe,PBe,PCe}.
3. power selective factor B
Power supply selective factor B xsuCharacterize, be variable to be solved, there is one-to-one relationship with supply path, it is one
0-1 variables, its value represent when being 1 that selection power supply s powers for electric transforming unit u, are that 0 expression does not select s to power for u, xsuWhen=1 pair
The supply path that answers is referred to as effective supply path.
4. power supply collection
All power supply collection that can power (there is corresponding supply path) to electric transforming unit u are collectively referred to as electric transforming unit u's
Power supply collection, uses symbol Su={ s } represents which has one-to-one relationship with supply path, for example, for the power transformation of Fig. 3
Unit a and e have, Sa={ A, C }, Se={ A, B, C }.
5. power supply unit collection
To any s ∈ S, all electric transforming unit u that can obtain power supply from s are referred to as the power supply unit collection of s, use symbol Ds=
{ u }, equally can be obtained for example according to original wiring diagram and using Depth Priority Searching, and power supply A and B for Fig. 3 have, DA
={ a, b, d, e, f }, DB={ d, e, f, g }.
6. power supply link set (Link)
Between electric transforming unit and adjacent power, or two adjacent electric transforming units exist interconnector (or for station in mother
Switch) power supply link (Link) is formed, all power supply links constitute power supply link set, with L={ lij}(i,j∈S∪D,i
≠ j, the two are adjacent), lijFor 0-1 variables, lij=1 refers to that the power supply link is to turn on (switch closure), lij=0 refers to disconnection (switch
Open).lijValue by xsuDetermine, see below explanation.
7. link paths collection
Each power supply link belongs to one or more supply paths, all comprising power supply link lijAll supply paths claim
For lijLink paths collection, use Fij={ PsuRepresent, for example：lCbLink paths integrate as FCb={ PCa,PCb, ldeLink
Path set is Fde={ PAe,PCd,PBe}.
If there is Psu∈Fij, xsu=1, then lij=1, i.e., power supply link is passed through simply by the presence of with effective supply path
lij, its value is just 1.
8. other definition
Through-put power Tsu：There is one-to-one relationship with supply path, represent from s to electric transforming unit u power when, in power supply
Path PsuThe power of upper transmission.
Power supply capacity Cs：Represent the maximum allowable power supply capacity of power supply s.
Link capacity Cij：Represent power supply link lijPermission maximum transfer capacity.
Electric transforming unit load Lu：Represent the load total amount connect by each electric transforming unit u.
Power supply power supply capacity Ls：The total capacity that each power supply s is confessed.
So far, the topological relation of high voltage distribution network is it has been established that the method for expressing such as traditional adjacency matrix is in this problem
The connection combination of consideration needed for above is a lot, for example, if relation between each 110kV stations is added into, variable in this example
Number is up to 210As many as.When distribution scale is slightly larger, multiple shot array problem will be faced.Dimension increase and meanwhile also can plus
Re-computation is born, and increases and solves difficulty.Method based on link-path is combined without enumerating out all possible connection,
Only line search need to be entered from each load side, then be shown with the form of set.From substantially froming the perspective of, load proposed by the present invention
Turn the high openness of actual electric network adjacency matrix to be make use of for method, be not exclusively 0 in the element exactly matrix in path set
Part.
Further, the constraints include single supply power constraint, loading demand constraint, capacity-constrained, exempt to bridge
Constraint, switch motion count constraint and 220kV network trend constraints.
(1) single supply is powered constraint
During load transfer adjustment, the radial structure of 110kV networks, i.e. each electric transforming unit should be maintained all the time only
Can be powered by a 220kV power supply, it is impossible to by multiple while powering and forming looped network.As selective factor B of powering is 0-1 variables,
So added is constrained to：
(2) loading demand constraint
Load transfer should meet the power demand of each electric transforming unit, i.e.,：
(3) capacity-constrained
The actual capacity that each 220kV power supply is confessed no more than its maximum capacity, i.e.,：
In formula, ksCoefficient, 0 ＜ k are set for 220kV transformer stations rate of load condensate control targes≤ 1, which is set except considering transformation
Outside the thermally-stabilised limit of device, it is also contemplated that the impact calculated from the stabilization of power grids, such as based on the transient state met under N-1 principles or dynamic
State is stablized secure threshold to set.
110kV transmission line capacity-constraineds：
(4) exempt from bridging constraint
Exempting from bridging constraint implication is：For the electric transforming unit connected between two 220kV power stations, the power supply of each electric transforming unit
Path can not overlap.
As shown in Figure 4, it is impossible to which the bridging situation of appearance is：A is powered by S2, and b is powered by S1.Typically, for an xsu,
Any electric transforming unit between s and u all must be powered by s.For this：
xsu≥xsv(u than v closer to s) (5)
For the concrete situation shown in Fig. 4, exempt from bridging and be constrained to：And
(5) switch motion count constraint
For ensureing that the radioactivity of 110kV networks, the " closed " of power distribution network breaker in middle, "off" behavior always occur in pairs,
One action group of synthesis, referred to as one time switch motion number of times.By the power supply link set obtained in optimization process and power supply link set
Initial state carry out contrast switch motion number of times be obtained, expression is：
Switching manipulation number of times is should be less than equal to a certain limit value, i.e.,：
O≤N (N is constant) (7)
In practical application, on-off times O can be set according to application scenarios different demands.
(6) 220kV networks trend constraint
Turn for during, after 220kV power stations are determined with 110kV power stations annexation, actual the connect load in 220kV power stations
(referring mainly to burden with power) also determines therewith.Consider that high voltage distribution network reactive power support is general more sufficient, it can be considered to
Using DC power flow computation model, and voltage security can be calculated check when the sequence of operation judges.DC power flow equation
For,
δS=B-1PS(8)
In formula B be system admittance matrix, PSFor injecting the active power vector of each power supply point, PS=-LS.220kV circuit lij
The active power of transmission is：
Pij=(δi-δj)/Xij(9)
X in formulaijFor line reactance value.Then trend constraint is as follows：
Further, when in transmission line section failure or 220kV stations, transformator off-load runs, generally require to cut off one
Fixed load is meeting the service requirement of electrical network.For electric transforming unit u, define load and cut off scale factor hu, 0 ＜ hu＜ 1 is right
The loading demand constraint that answers introduces load and cuts off scale factor, makes following change：
The load structure of electric transforming unit is considered, cutting off load proportion can not be excessive, load cuts off scale factor should expire
Foot：
hu≤hu.max(12)
Further, the object function includes harmonious optimization object function and cuts off loading minimum optimization aim letter
Number.
Specifically, load balancing degree B is to weigh high voltage distribution network economy, an important indicator of safe operation, uses load
The mean square deviation of rate portraying load balancing degree, including power supply load balancing degree BsWith line load equilibrium degree Bl, represent and deviate averagely
The size degree of rate of load condensate, its value are more little more balanced, power supply load balancing degree BsWith line load equilibrium degree BlWeighted sum can be obtained
Arrive system finishing weighted balance degreeAnd ω1+ω2=1.
Wherein, power source loads equilibrium degree：
Line load equilibrium degree：
Wherein：NsFor the number of 220kV power supplys, NlFor all 220kV transmission lines of electricity numbers,WithPoint
Not Wei 220kV power supplys and 220kV transmission lines of electricity rate of load condensate,Pli.max、PliFor 220kV
The maximum allowable transmission capacity of multi-line power transmission circuit i, actual transmissions capacity (correspond respectively to the P in formula (10)ijmaxWith
Pij).
For so that network load equilibrium degree is in reasonable level, the harmonious optimization object function adopted by load transfer just like
Lower selection：
(1) consider the load balancing of power supply：
Take ∞-norm：
Take 2- norms：
(2) consider the load balancing of transmission line：
Take ∞-norm：
Take 2- norms：
Further, the load for introducing each electric transforming unit in foregoing teachings cuts off scale factor, here to system entirety
Cutting load amount illustrate.The workload demand amount in 110kV power stationsKnown, turn for the load total amount of rear reservation be：
For making excision loading (percent) minimum, the optimization object function for adopting for：
Further, objective optimization function includes above-mentioned F1And F2, in the situation for not considering to cut off load, system optimization letter
Number F=F1；When consideration cuts off the situation of load, actual load turns confession and can consider above-mentioned two main optimizing index, can adopt
With combinations thereof, i.e.,：
MinF=ε1F1+ε2F2(21)
ε1、ε2For weight factor, ε1+ε2=1, its value is flexibly selected according to practical situation.
Further, the load transfer Optimized model due to setting up is mixed-integer programming model containing 0-1 variables, its line
Property degree relatively low, herein using branch and bound method solve.
Specifically, Fig. 6 is 220kV high tension distribution system topological structure schematic diagrams, and Fig. 7 is derived based on aforementioned electric transforming unit
110kV high tension distribution system topological structure schematic diagrams, and have selected certain load peak-peak as calculating parameter.Fig. 6 gets the bid
Note ignores its resistance except the reactance value (perunit value) of every 220kV transmission line.In figure, the system has 6 220kV and becomes
Power station (A～F), each 220kV power station are provided with two transformators, 15 110kV electric transforming units, 10 220kV circuits, 28
110kV circuits, wherein 14 circuits are in available, total load 830MW, and system is in heavily loaded level.Table 1-3 is given at the beginning of system
Corresponding load, capacity parameter during beginning state.
220kV line load situations under 1 embodiment of table, 1 initial operating mode
220kV transformer stations loading condition under 2 embodiment of table, 1 initial operating mode
110kV transformer stations loading condition in 3 embodiment 1 of table
From table 1-3, circuit and 220kV plant load distributed poles are unbalanced, and circuit BE rate of load condensates are 71.15%, and
The most light circuit DC of rate of load condensate is only 1.93%, and the two rate of load condensate difference is 68.22%；Two station owner's variable load rate of D, E exceedes
80%, belong to heavy service, there is the risk of overload；And the band at C stations is carried and kicked the beam, the 30% of rated capacity is not reached.Fixed
In amount analysis, under original state, 220kV plant loads equilibrium degree, transmission line load balancing degree and weighted balance degree (set
ω1=0.8, ω2=0.2, similarly hereinafter) can be calculated：Bs=0.207；Bl=0.236；Numerical value is all higher.Load
Skewness to electrical network trend distribution bring unfavorable bring impact, make operation of power networks uneconomical, there is operation risk, or even can
Accident can be caused.
Analysis is optimized based on three kinds of scenes：1) switch motion number of times is not limited；2) switch motion 6 times is limited；3) limit
Switch motion 4 times.Select 11.0 business softwares of Lingo to solve, make use of the Global Solver computing engines of the software, obtain
Result such as table 4 is arrived, the plant load rate for calculating gained is represented with radar map and is seen Fig. 8,220kV line loads rate such as Fig. 9.
4 turns of table is for strategy and power load distributing state
Understand that 220kV transformer stations load balancing number of degrees value has bright when allowing switching manipulation number of times to increase by table 4, Fig. 8
Aobvious reduction, peak load of standing rate, transmission line peak load rate are also decreased obviously, and illustrate that the load of present invention offer turns
For the effectiveness of method, can obtain under preferable portfolio effect, and three kinds of scenes, when rate of load condensate is all controlled below 80%,
All there is not load shedding situation.As it can be observed in the picture that after adding switching number constraint (switching manipulation 4 times, switching manipulation 6 times),
Equilibrium degree less limit switch number of times is deteriorated, and shows as shape deformity seriously, and numerical value is bigger than normal.And as seen from Figure 9, initial operating mode
Under, 220kV transmission line of electricity BE rate of load condensates are all greatly alleviated after algorithm load balancing optimization more than 70%.By three scenes
Under the power station load factor contrast respectively with original state of power station load factor, see Figure 10, as seen from the figure, the load heavy duty of D, E station is caused
Produce its load, load transfer station is slightly different under different scenes, but all achieve and meet institute Prescribed Properties operation obstruction
Regulation and control.
From the application result of embodiment 1 it is recognised that under the conditions of meet the constraint, switching manipulation number of times be one important
Limit, as increasing for switching manipulation number of times, load transfer adjustment capability are stronger, load is more balanced, but switching manipulation number of times increases
Many, other especially stable problems may be brought.Therefore, dispatcher is needed comprehensively to weigh factors above to choose during practical operation
Rational turning solution.
Embodiment 2
Embodiment 2 is with the difference of embodiment 1, when there are N-1 failures for system, is now likely to occur some main transformers
Or circuit overload operation, the serious operation safety for threatening system, requirement can not be met by load transfer merely (unfeasible
Solution), must now take load to cut off, objective optimization function needs to consider that the impact that load cuts off, objective optimization function must be selected
Select (21) formula.Herein, it is divided to two kinds of scene discussion, i.e., limit switch action frequency and maximum switch motion number of times are not set as 6
Secondary.N-1 failures include 220kV transforming plant main transformer N-1 failures and 220kV transmission line N-1 failures.
220kV transforming plant main transformer N-1 failures
Under 1 initial operating state of embodiment, it is assumed that a transformer fault of 220kV power stations C is exited, separate unit runs.
As a result such as table 5, the plant load rate for calculating gained is represented with radar map and sees Figure 11.As shown in Table 5, all realize in the case of two kinds
Load control under the conditions of meet the constraint, 220kV transformer stations load balancing number of degrees values have substantially reduction, illustrate the present invention
The effectiveness of method.But load shedding control is also all occurred in that, and when having switch to limit, cuts off load showed increased.Can from Figure 11
See, add action time, less, the latter's equilibrium degree is more preferable on the contrary for the two balance degree difference, but which is more negative to cut off
Lotus is cost.
5 turns of table is for strategy and power load distributing state
220kV transmission line N-1 failures
Under 1 initial operating state of embodiment, it is assumed that 220kV transmission lines hinder disconnection for some reason.As a result such as table 6, radar is used
The plant load rate for calculating gained is represented by figure sees Figure 12.As shown in Table 6, under the conditions of all achieving meet the constraint in the case of two kinds
Load control, when but equally all occurring in that load shedding control, and having switch to limit, cut off load showed increased and become apparent from.From
Figure 12 is visible, adds action time, and less, the former equilibrium degree is more preferable for the two balance degree difference.In addition, former with above transformator
Barrier exits load balancing adjustment Comparative result, and impact of the line fault to load balancing degree is slightly smaller.
6 turns of table is for strategy and power load distributing state
Finally, it should be noted that multiple step compositions of reason at flow chart or flow chart described in the application, and
And, each step can be divided into multiple subdivisions；On the other hand, some can also merge into a part.The application
Although text is set forth according to embodiment, it will be appreciated that the present invention is not limited to the embodiment, Ben Wenben is also wrapped
Containing the deformation in various deformation example, equivalents.In addition, various combinations, mode, even wherein only will comprising one
Element or other combinations more or less of, mode are also included in the category of Ben Wenben, thought range.
Claims (10)
1. a kind of urban high voltage distribution network load based on Link-path turns to supply method, it is characterised in that comprise the following steps：
S1, divides the domain in high-voltage distribution network, to each node serial number；The domain includes power domain and electric transforming unit domain；
S2, with each electric transforming unit as root node, concentrates search supply path from supply path, and forms corresponding power supply
Collection, power supply unit collection, link paths collection, determine power supply link set initial value；Wherein, the supply path collection of electric transforming unit refers to all
The set of paths that is powered to the electric transforming unit by power supply；The power supply collection of electric transforming unit refer to all can be to the electric transforming unit
The power supply set of power supply；The power supply unit collection of power supply refers to all electric transforming unit set that can obtain power supply from the power supply；Power transformation
The interconnector existed between unit electric transforming unit adjacent with adjacent power or two forms a power supply link, all of power supply
Link constitutes power supply link set；Each power supply link belongs to one or more supply paths, all confessions comprising the power supply link
Power path becomes the link paths collection of the power supply link；
S3, builds constraints and object function；
S4, solves power supply selective factor B, and the power supply selective factor B is corresponded with supply path, the power supply selective factor B value
For 1 when, represent and select power supply to power for the electric transforming unit, be worth for 0 when represent；
S5, according to power supply selective factor B result, forms load turning solution.
2. load according to claim 1 turns to supply method, it is characterised in that the supply path collection includes available circuit.
3. load according to claim 1 and 2 turns to supply method, it is characterised in that the supply path collection is connect according to original
Line chart is simultaneously obtained using Depth Priority Searching.
4. load according to claim 3 turns to supply method, it is characterised in that said supply unit collection is according to original wiring diagram
And obtained using Depth Priority Searching.
5. load according to claim 1 turns to supply method, it is characterised in that the power supply link also includes female in transformer station
The interconnector that connection switch is constituted.
6. load according to claim 4 turns to supply method, it is characterised in that the constraints includes that single supply is powered about
Beam, loading demand constraint, capacity-constrained, exempt from bridging constraint, switch motion count constraint and 220kV network trend constraints.
7. load according to claim 6 turns to supply method, it is characterised in that loading demand constraint introduces load and cuts off ratio
The factor.
8. load according to claim 7 turns to supply method, it is characterised in that the object function includes harmonious optimization mesh
Scalar functions and excision loading minimum optimization object function.
9. load according to claim 8 turns to supply method, it is characterised in that the harmonious optimization object function includes examining
Consider the load balancing function of the load balancing function and consideration transmission line of power supply.
10. load according to claim 9 turns to supply method, it is characterised in that solves power supply using branch and bound method and selects
The factor.
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| CN109449934A (en) * | 2018-12-10 | 2019-03-08 | 四川大学 | A kind of power transmission network obstruction management-control method based on the reconstruct of high voltage distribution network subregion |
| CN113013871A (en) * | 2021-01-25 | 2021-06-22 | 浙江华云信息科技有限公司 | Load transfer method for power distribution network equipment during fault and maintenance |
| CN113452027A (en) * | 2021-07-27 | 2021-09-28 | 山东鲁软数字科技有限公司智慧能源分公司 | Energy scheduling system and method for low-voltage flexible direct power distribution transformer area |
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| CN109449934A (en) * | 2018-12-10 | 2019-03-08 | 四川大学 | A kind of power transmission network obstruction management-control method based on the reconstruct of high voltage distribution network subregion |
| CN109449934B (en) * | 2018-12-10 | 2021-10-22 | 四川大学 | Transmission network blocking management and control method based on high-voltage distribution network partition reconstruction |
| CN113013871A (en) * | 2021-01-25 | 2021-06-22 | 浙江华云信息科技有限公司 | Load transfer method for power distribution network equipment during fault and maintenance |
| CN113452027A (en) * | 2021-07-27 | 2021-09-28 | 山东鲁软数字科技有限公司智慧能源分公司 | Energy scheduling system and method for low-voltage flexible direct power distribution transformer area |
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