CN109919350A - A kind of multistage substation's Expansion Planning method considering overall economy quality - Google Patents
A kind of multistage substation's Expansion Planning method considering overall economy quality Download PDFInfo
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Abstract
The present invention relates to a kind of multistage substation's Expansion Planning methods for considering overall economy quality, include the following steps: the target year with the load period of saturation as project period, it plans that regional load is horizontal according to target year, carries out substation locating and sizing planning in the case where not considering distributed generation resource access scene；Horizontal, existing substation capacity, DG confidence capacity and given substation's candidate's capacity set according to target year planning regional load；In conjunction with the load level in each stage planning of intermediate year area, is pushed back by stage to status year using preferential volume reduction as principle from target year, obtain the programme of intermediate year substation；Preferentially to go to station to be pushed back by stage to status year for principle from target year, the programme of intermediate year substation is obtained；Multistage substation's Expansion Planning scheme is collectively formed with target year planning scheme with the optimal scheme of economy in the two；Calculate the overall economy quality of multistage substation Expansion Planning scheme.
Description
Technical field
The present invention relates to a kind of multistage substation's Expansion Planning methods for considering overall economy quality, are suitable for China city
The work of power distribution network substation planning, belongs to city network planning management domain.
Background technique
Substation planning is the important component in Power System Planning, and the result of planning scheme will affect whole
Grid structure, investment and the economy of operation and power supply reliability of a power distribution network.Since electric load increases year by year, rule
The engineering schedule of Hua Qinei substation should meet the workload demand in each stage.Coordinate the planning in target year and intermediate year substation
Scheme, realize planning region substation development transition, be of great immediate significance and substation planning in master
Want research direction.
In the research of existing multistage substation planning, usually problem is disassembled as target year substation planning and centre
Year two problems of substation planning, are then gradually solved.Wherein, in the substation planning stage in target year, mainly for mesh
The workload demand in year planning area is marked, with the minimum objective decision target year substation of the year investment cost of target year programme
Site and station hold.Then, the program results based on target year substation, the load level in conjunction with intermediate stage planning area are excellent
Change construction, the dilatation time of intermediate stage each substation.In the method, the selection of target year planning scheme only considers
It the economy of target year programme, intermediate year is solved completely based on target year programme.In fact, due to
There is the different time values in the put into operation construction cost of substation of different year, need to come from the angle of overall life cycle cost whole
The economy in body metric objective year and intermediate year planning scheme.Therefore, the existing batch ticket method researched and proposed is not
The interaction between target year and intermediate year planning scheme can effectively be coordinated.
Summary of the invention
It is an object of the invention to consider to propose on the basis of target year and intermediate year planning scheme reciprocation
A kind of multistage substation dual blank-holder carries out target year substation planning using weighted Voronoi diagrams figure, and for centre
That has formulated transition scheme year quickly pushes back strategy, and the integration for foring multistage substation's Expansion Planning solves process.Skill
Art scheme is as follows:
A kind of multistage substation's Expansion Planning method considering overall economy quality, including the following steps:
(1) it plans that regional load is horizontal as the target year of project period with the load period of saturation according to target year, is not considering
Distributed generation resource (DG), which accesses, carries out substation locating and sizing planning under scene, assess DG confidence capacity according to programme；
(2) horizontal, existing substation capacity, DG confidence capacity and given power transformation according to target year planning regional load
It stands candidate capacity set, determines N number of substation capacity assembled scheme for meeting capacity-constrained；
(3) target year substation planning is carried out for k-th of combined capacity scheme, the method is as follows:
A) do not consider that DG is accessed, for substation capacity assembled scheme, using weighted Voronoi diagrams nomography to planning region
Substation planning is carried out, the supply district of initial substation location and substation is obtained；
B) according to DG distribution situation in obtained each substation's supply district, DG confidence in each substation's supply district is assessed
Capacity；
C) based on obtained DG confidence volumetric basis, the power supply of each substation is divided using weighted Voronoi diagrams nomography
Range determines new substation location with the minimum principle of load moment in each substation's supply district；
D) step b)-c is repeated), stop changing after the precision that substation location movement and DG confidence capacity reach certain
In generation, obtains target year planning scheme Ik；
(4) according to target year planning scheme Ik, in conjunction with the load level in each stage planning of intermediate year area, with excellent
First volume reduction is that principle is pushed back to status year by stage from target year, obtains the programme M of intermediate year substationk, method
It is as follows:
A) construction scheme for choosing t+1 stage substation is the initial setup state of substation in t stage, utilizes weighting
Voronoi drawing method divides the supply district of each substation；
B) substation minimum to institute's on-load capacity carries out station and handles, and updates the setup state of each substation；
C) supply district for dividing each substation again using weighted Voronoi diagrams drawing method, judges whether to meet substation
Capacity-constrained and radius of electricity supply constraint otherwise abandon this and station are gone to operate if so, repeating step b)；If judging the substation is
No completion dilatation if so, carrying out volume reduction to the substation, and is powered range division again, such as meets substation capacity about
Beam and radius of electricity supply constraint then repeat step b), otherwise enter in next step；
D) operation to the substation is abandoned, the setup state of the substation and program is final as this stage is updated
Construction scheme enables t=t-1 and return step a) until completing the calculating in each stage, obtains intermediate year planning scheme Mk；
(5) according to target year planning scheme Ik, preferentially to go to stand as principle from target year by stage to status year
It is pushed back, obtains the programme N of intermediate year substationk, the method is as follows:
A) construction scheme for choosing t+1 stage substation is the initial setup state of substation in t stage, utilizes weighting
Voronoi drawing method divides the supply district of each substation；
B) it is ranked up according to the actual loading rate of substation with substation nominal load rate ratio size, judges the ratio
Whether minimum substation has completed dilatation, carries out volume reduction operation to the substation if the substation has completed dilatation,
Otherwise station is carried out to the substation to handle, update the setup state of each substation；
C) supply district for recalculating substation judges whether to meet substation capacity constraint and substation's radius of electricity supply
Constraint is otherwise abandoned this and is operated into next step if so, repeating step b)；
D) operation to the substation is abandoned, the setup state of the substation and program is final as this stage is updated
Construction scheme enables t=t-1 and return step a) until completing the calculating in each stage, obtains intermediate year planning scheme Nk；
(6) intermediate year planning scheme M is calculated separatelyk、NkEconomy, and the side optimal with economy in the two
Case is the same as target year planning scheme IkCollectively form multistage substation's Expansion Planning scheme Fk；
(7) multistage substation Expansion Planning scheme F is calculatedkOverall economy quality；
(8) k=k+1, return step (3) are enabled, until completing asking for whole N number of target year substation capacity assembled schemes
Solution；
(9) by multistage planning scheme F1To FNThe optimal scheme of middle overall economy quality is multistage as planning region
Section substation planning result.
Step (7) is specific as follows:
A) it combines substation's load factor to constrain, set the load period of saturation, rate of rise year as 0.4%, solution target year power transformation
Stand construction scheme IkThe longest time limit T of workload demand is still able to satisfy after project periodf；
B) with T after status year to the period of saturationfThe investment cost of Nian Neige stage substation is as multistage substation planning
The economic cost of scheme, may be expressed as:
In formula: MstationFor intermediate stage investment of substations expense year value, including substation's construction cost and maintenance cost；
MlineFor intermediate year track investment expense year value, including line construction expense, maintenance cost and cost of losses, TmFor load entrance
The time of the period of saturation；R is discount rate；CStation、CFeederFor target year substation and track investment expense year value, CCQFor target
Year route cost of losses year value.
Detailed description of the invention
Fig. 1 is model solution frame；
Fig. 2 is economic computation model；
Fig. 3 is region load Current distribution situation；
Fig. 4 is region load target year distribution situation；
Fig. 5 is multistage substation's batch ticket result figure；
Fig. 6 is radius change factor schematic diagram；
Fig. 7 is using multistage substation dual layer resist Optimized model proposed in this paper, to development zone target year and centre
Year carries out joint planning, substation's construction situation in obtained this area each stage.
Specific embodiment
The present invention relates to a kind of multistage substation's Expansion Planning methods for considering overall economy quality, the step of this method such as
Under:
(1) the dual-layer optimization frame of multistage substation is established
Multistage substation planning problem contains target year substation planning and intermediate year two problems of substation planning.
Wherein, intermediate year substation planning is carried out based on target year substation planning result, and program results will be by target year
The limitation of programme, therefore in target year substation planning need to consider the economy of intermediate year planning scheme.
In order to coordinate the interaction between target year and intermediate year planning scheme, the present invention proposes bi-level optimal model, upper layer
It is optimal for target with target year and intermediate year overall economy quality, target year planning scheme is solved, and programme is passed
Pass underlying model；Underlying model is according to target year substation planning as a result, to meet substation's capacity-load ratio under N-1 criterion
Minimum target, solves the engineering schedule of intermediate Nian Ge stage substation, and intermediate year planning scheme is passed to
Layer, a part of economic evaluation as a whole, to select optimal multistage planning scheme.
By the dual layer resist Optimized model, intermediate year power transformation is taken into account in the selection of the planning scheme in target year
It stands the economy of construction scheme, can effectively coordinate the interactive relation between target year and intermediate year substation planning problem, from
And realize the global optimization of multistage substation.
(2) multistage substation overall economy quality calculation method is proposed
Multistage substation's Expansion Planning was optimized from status year to substation's dynamic enlarging process target year.At this
During one, each stage may invest to build new substation or carry out dilatation to existing substation, until to completing in target year
Whole substation's construction.Consider the relationship of substation's life cycle and project period, it can when only a small number of substations are to target year
Just reach service life, may also have certain service life (transformer 3 of such as Fig. 2) when remaining substation is to target year
Or do not arrive and just have reached service life (transformer 1 of such as Fig. 2) target year, it is therefore desirable to consider the surplus value of substation
And the problems such as building again.In addition, in long-term multistage substation planning problem, often with the load growth period of saturation as planning
Target year.And after load enters saturation stage, growth is more slow, and target year, planning scheme was following considerably long
Period in be still able to satisfy workload demand.Within this period, substation builds circulation investment after reaching service life, therefore
It should also contain in this period substation's circulation in the calculating of multistage substation's overall economy quality and invest to build expense, so as to by target
Year carries out whole measurement with intermediate year programme.Since each investment of substations time scale is different, further relates to repeated construction and ask
Topic, general expenses cannot directly add up, it is necessary to be transformed on unified time origin and be settled accounts.For this reason, it may be necessary to determine
The time domain invested to build is recycled in target Nian Hou substation.
Research hair is carried out by Economic Development Status to developed countries such as the U.S., Britain and Japan and load state of development
Existing, a regional electric load grows steadily the lasting low speed of presentation after entering saturation stage.In this stage, load growth
Trend is slower, and the average growth rate in continuous 10 years is no more than 4%.The present invention with planning region load enter the period of saturation when
Between for planning target year, it is assumed that still increased in this afterload with 0.4% year growth level, in the capacity-load ratio of substation
Under constraint, T of the planning scheme in target year after target yearfThe workload demand of this area is able to satisfy in year, hereafter
It then needs to plan the substation of this area again.Therefore, the present invention will be with the T after status year to target yearfIt is each between year
Economic cost of the item expense as multistage planning scheme, it is specific as shown in Figure 2.
(3) multistage substation's bi-level optimal model is established
(3.1) target year substation planning model
1) objective function
In order to carry out whole optimizing to multistage planning scheme, using more in target year substation planning model
Optimal stage substation's overall economy quality is objective function, as shown in formula (1).
CMID=Mstation+Mline (2)
Wherein, CMIDFor investment cost year value, M after the intermediate stagestationFor intermediate stage investment of substations expense year value,
Including substation's construction cost and maintenance cost, as shown in formula (3).MlineFor intermediate year track investment expense year value, including line
Road construction cost, maintenance cost and cost of losses, it is specific to calculate as shown in formula (4).CStation、CFeederFor target year substation
And track investment expense year value, CCQIt is specific to calculate and intermediate year substation and circuit fee for target year route cost of losses year value
It is identical with calculating.N is substation's sum；TmEnter the time of the period of saturation for load；Cost is invested to build for substation i；
For 0/1 variable, indicate whether substation i completes to invest to build at the t stage；For the dilatation cost of substation i；Become for 0/1
Amount, whether substation i completes dilatation when indicating the t stage；R is discount rate；miIndicate the service life of substation i；ui, zi is substation
The maintenance cost ratio and residual value cost ratio of i；Ji,tFor the load aggregation of i institute, t stage substation band, j is load bus；H is
Circuit types set, h are circuit types；For the unit construction cost of H type route；li,jFor substation i's and load point j
Line distance；λfi,t,j,hFor 0/1 variable, indicate whether built h molded line road between t stage substation i and load point j；ehFor h
The service life on molded line road；vhFor the maintenance cost ratio of H type route；yhFor the residual value cost ratio of H type route；For H type route
Loss conversion factor,For current electricity prices,Hourage is lost for route year,For every kilometer of resistance on h molded line road,
UiFor substation's i line voltage,For power factor.
After considering DG access power distribution network, sub-load is powered by DG, the decline of line transmission capacity, route running wastage
Coefficient k (Mi,t) will be with DG permeability Mi,tIncrease and reduce, wherein Mi,tCalculating it is as follows:
In formula, PDGFor the confidence capacity of DG, PLFor load maximum value.
2) constraint condition
In substation planning, the load factor of each substation's band must satisfy N-1 principle, therefore the construction of substation is held
Amount and load level must satisfy certain inequality requirement.Meanwhile the access of DG reduces the network for the load of planning region, becomes
Supply district of the power station on the direction DG will increase, and the influence of DG must be taken into consideration in the radius of electricity supply constraint of substation.Finally
It is as follows to establish constraint condition:
1. substation capacity constrains:
In formula: SiIndicate the construction capacity of target year substation i；γiFor the nominal load rate of substation i；Ti PVFor power transformation
It stands the confidence capacity of photo-voltaic power supply in i supply district；Ti WTGFor the confidence capacity of substation i supply district inner blower power supply.
2. substation's radius of electricity supply constrains
li,j≤Ri×ψi,j (8)
In formula, RiIt is constrained for the radius of electricity supply of conventional electrical distribution Wang Zhong substation i；Radius change factor ψi,jReflect DG electricity
Influence of the source on the direction load point j, the DG confidence capacity for influencing load point j is bigger, ψi,jValue is bigger, and specific calculating is as follows:
In formula: GiFor the DG set powered to substation i, g is DG node；Si,gWith Ri,gRespectively power to substation i
DG node g installed capacity and equivalent radius of electricity supply；li,gAt a distance from substation i and DG node g；ρiFor substation i power supply
Load density in range.
3. substation's supply district does not intersect:
In formula: ηi,jFor 0/1 variable, for judging whether load point j is powered by substation i；δi,gAlso it is 0/1 variable, uses
In judge DG point g whether to substation i power.
(3.2) intermediate year substation planning model
Intermediate year substation planning model is based on target year substation planning as a result, to meet the substation of N-1 criterion appearance
It carries than minimum objective function, the construction scheme of decision centre year substation.Intermediate year substation planning layer objective function is as follows:
MinF=∑ Si,t/Pt (12)
Wherein, Si,tIndicate the rated capacity of t-th of stage substation i, Pt,maxIndicate t-th of stage load maximum value.
In intermediate year substation planning, also need to meet the capacity-constrained of substation, radius of electricity supply constraint and power supply
Range constraint.Further, since the great number removal cost of substation, therefore do not consider that substation removes and rebuild situation, substation builds
If scheme is by the constraint by preceding stage programme.It is as follows finally to establish constraint condition:
1. substation capacity constrains:
2. substation's radius of electricity supply constrains
li,j,t≤Ri,t×ψi,j,t (14)
3. substation's supply district does not intersect:
4. substation's engineering schedule constrains:
5. substation location constrains:
Li,t=Li,T (17)
In formula, Li,tIndicate the site of t stage substation i, Li,TIndicate the site of target year substation i.
(4) multistage substation integration planing method is proposed
(4.1) target year substation planning model solution
Target year, substation planning was the single phase substation planning that load level based on target year planning region carries out, certainly
Plan variable is site and the capacity of newly-built substation.First when not considering DG, according to the load level of planning region, have
Substation capacity carries out substation planning, assesses DG confidence capacity according to program results.It is waited in conjunction with DG confidence capacity and substation
Capacity is selected to estimate newly-built substation's quantitative range, due to meeting substation and holding load under determining newly-built substation's number constraint
It is more less than the combined capacity amount of projects of requirement, the combined capacity scheme that enumerative technique solves substation can be directly used, finally
Substation site selection, constant volume are carried out in conjunction with weighted Voronoi diagrams nomography.Specific solution process is as follows:
1. planning that regional load is horizontal according to target year, substation planning is carried out in the case where not considering DG access scene, according to
Programme assesses DG confidence capacity.
2. according to planning that regional load is horizontal target year, having substation capacity, DG confidence capacity and given power transformation
It stands candidate capacity set, determines N number of substation capacity assembled scheme for meeting capacity-constrained.
3. not considering that DG is accessed, for each substation capacity assembled scheme, using weighted Voronoi diagrams nomography to planning
Region carries out traditional substation planning, obtains the supply district of initial substation location and substation.
4. obtaining the distribution situation of DG in each substation's supply district according to substation planning result, assesses each substation and supply
The confidence capacity of DG in electric range.
5. dividing the power supply of each substation using weighted Voronoi diagrams nomography based on obtained DG confidence volumetric basis
Range determines new substation location with the minimum principle of load moment in each substation's supply district, constantly repeats the process
Until substation location is moved to certain precision.
6. since substation location is mobile, corresponding change occurs for substation's supply district and DG confidence capacity, repeat 3. -4.
Stop iteration after the precision that the mobile confidence capacity with distributed generation resource of substation location reaches certain, obtains this scheme
Final result.
(4.2) intermediate year substation planning model solution
Intermediate year substation planning is related to multiple timing nodes, there are biggish relevance between each node programme,
It is larger to solve difficulty.For this problem, it set forth herein target year programme is based on, is returned by stage to the quick of status year transition
Push away strategy.First from target annual variation power plant construction situation, as the default setup state of previous stage substation, according to change
Power station institute on-load capacity constantly reduces substation and invests to build capacity, is pushed back by stage to status year.It is main during pushing back
There are the several two kinds of thinkings of seat invested to build capacity and invest to build substation with preferential reduction for preferentially reducing by certain substation.The present invention is becoming
Going to station among power station in the solution of year programme with preferential volume reduction and preferentially respectively is principle solution target year substation planning side
Intermediate year of the lesser scheme of expense as target year programme is finally chosen in the two in intermediate year construction scheme under case
Construction scheme.
Wherein, preferentially go under the principle of station quickly to push back strategic process as follows:
1. the construction scheme for choosing t+1 stage substation is substation's original state in t stage, weighted Voronoi diagrams are utilized
Drawing method divides the supply district of each substation；
2. the substation minimum to institute's on-load capacity carries out station and handle, the setup state of each substation is updated；
3. dividing the supply district of each substation using weighted Voronoi diagrams drawing method, judge whether to meet substation capacity
Otherwise constraint and radius of electricity supply constraint abandon this and station are gone to operate if so, repeating step 2..If dilatation is completed in the substation,
Volume reduction is carried out to the substation, and is powered range division again, judges whether to meet constraint, if then repeating step 2.,
Otherwise enter in next step；
4. abandoning the operation to the substation, the setup state of the substation and program is final as this stage is updated
Construction scheme, enable t=t-1 and repeat step 1. -4. until completing the calculating in each stage；
5. calculating the comprehensive method of investment expense in entire project period according to the construction scheme in target year and intermediate each stage substation
With.
Preferential volume reduction principle is roughly the same with the concrete operations process of principle of preferentially going to stand, the main distinction be step 2.-
3. be listed below preferential volume reduction strategy step 2.-operating method 3.:
2. being ranked up according to the actual loading rate of substation with substation nominal load rate ratio size, the ratio is judged
Whether minimum substation has completed dilatation, carries out volume reduction operation to the substation if the substation has completed dilatation,
Otherwise station is carried out to the substation to handle, update the setup state of each substation；
3. recalculating the supply district of substation, judge whether to meet substation capacity constraint and substation's radius of electricity supply
Otherwise constraint is abandoned this and is operated into next step if so, repeating step 2..
It is 97.56km that this example, which selects certain occupied area,2Development zone, 308 cells are classified as according to plan for land.
Load prediction is carried out to development zone according to the occupied area of the load density of different type planned land use and each cell, until target year
Total load is 1676.5MW, power factor 0.9.Prediction target year this area's photovoltaic rated capacity is 301.5MW, and blower is specified
Capacity is 225MW.The optional capacity of substation yet to be built shares 2 × 40MVA, 2 × 50MVA, 3 × 40MVA and 3 × 50MVA tetra-
Kind, construction cost is respectively 22,000,000 yuan, 25,000,000 yuan, 32,000,000 yuan, 36,000,000 yuan.Wherein, two transformer substations can expand
It builds as three transformer substations, 2 × 40MVA and 2 × 50MVA substation development cost are respectively 10,000,000 yuan and 12,000,000 yuan.
Substation's service life is 30 years.According to " N-1 " principle, substation's load factor containing two main transformers is limited to 65%, contains three main transformers
Substation's load factor be limited to 85%.
The planning region includes the station that has of three 3 × 50MVA, and site, appearance of standing and supply district are as shown in Figure 3.Fig. 3 is simultaneously
The existing load in the development zone is given, other emerging loads are divided into according to target annual load size starts development on the 1st year
Load and the load for starting development on the 5th year, each type load increases according to serpentine curve growth trend, until the 20th year project period
Each point load initially enters the period of saturation in development zone.The growth trend of each type load is as shown in figure 5, according to the growth pattern of load
4 stages will be divided into project period.
Existing multistage substation planning thinking is used first, is so that the year investment cost of target year programme is optimal
Object solving target year substation location station holds.It is obtained shown in target year planning scheme such as Fig. 6 (d) with this.According to this
Target year planning scheme, intermediate year substation planning result such as Fig. 6 is solved using the strategy that quickly pushes back that (3.2) propose
It is shown.Share 15 substations under the program development zone target year, comprising 23 × 40MW capacity substations and 12 3 ×
50MW, it is 2190MW that capacity is invested to build in main sub-station, and wherein substation 1, substation 2 and substation 3 are that this area has substation.
Under the program target year substation capacity-load ratio be 1.377, the year investment cost in target year is 154,170,000 yuan/year.
Using multistage substation dual layer resist Optimized model proposed in this paper, development zone target year and intermediate year are carried out
Joint planning, the substation's construction situation for obtaining this area's each stage are as shown in Figure 7.It can be seen from the figure that being somebody's turn to do in target year
16 substations are invested to build in area altogether, substation including 12 × 40MW capacity, the substation of 43 × 40MW capacity and 11
The substation of 3 × 50MW capacity, total installation of generating capacity reach 2210WM.The target year and centre that the program and batch ticket method obtain
Substation's construction data such as capacity and investment cost in each stage are as shown in table 1, table 2.
Target annual variation power plant construction Comparative result under 1 two schemes of table
Year program results comparison among 2 two schemes of table
It can be seen that compared with traditional multistage substation batch ticket method from the data in table 1, combine planing method
Obtained scheme need to invest to build 16 substations target year altogether, and substation's construction capacity increases 20MVA, the year investment in target year
Cost improves 1,320,000 yuan/year.But from the point of view of entire project period, multistage substation proposed by the present invention combines planing method
Obtained schemes synthesis investment cost reduces 4.2%.The planning side of this explanation multiple-step optimization in multistage substation planning
Method may just eliminate globally optimal solution in the substation planning stage in target year, and final program results is made to fall into local optimum
Solution.Although it is slightly lower in fourth stage investment cost to can be seen that the scheme obtained by batch ticket from the data in table 2,
The scheme that joint planing method solves will be higher than with the investment cost of phase III in the first stage.Meanwhile this two
In a scheme, the cost of investment in intermediate stage (and first, second, and third stage) accounts for the 40% of general planning phase cost of investment
More than, it is the pith that can't be ignored in overall cost of ownership project period.
By the target year and intermediate year economic comparison result of two schemes it can be concluded that draw a conclusion, become in the multistage
In power scheme, the investment cost of intermediate year substation ratio shared in total investment expenses within entire project period is not allow to neglect
Depending on, it is inaccurate using the investment cost in target year as the economic index for judging multistage planning scheme.Together
When, since the engineering schedule of substation must satisfy certain constraint, the selection of planning scheme of target year will be limited
Make the range of choice of intermediate year planning scheme.Traditional multistage substation batch ticket method is to target year Construction Party
In the selection of case, the investment cost for only accounting for target year ignores influence of the intermediate year investment cost to integrated planning scheme,
It is a kind of substep optimizing strategy, obtained result is often trapped in local optimum, does not ensure that obtain globally optimal solution.
Claims (2)
1. a kind of multistage substation's Expansion Planning method for considering overall economy quality, including the following steps:
(1) it plans that regional load is horizontal as the target year of project period with the load period of saturation according to target year, is not considering to be distributed
Formula power supply (DG), which accesses, carries out substation locating and sizing planning under scene, assess DG confidence capacity according to programme；
(2) according to target year planning regional load, horizontal, existing substation capacity, DG confidence capacity and given substation are waited
Capacity set is selected, determines N number of substation capacity assembled scheme for meeting capacity-constrained；
(3) target year substation planning is carried out for k-th of combined capacity scheme, the method is as follows:
A) do not consider that DG is accessed, for substation capacity assembled scheme, planning region is carried out using weighted Voronoi diagrams nomography
Substation planning obtains the supply district of initial substation location and substation；
B) it according to DG distribution situation in obtained each substation's supply district, assesses DG confidence in each substation's supply district and holds
Amount；
C) based on obtained DG confidence volumetric basis, the supply district of each substation is divided using weighted Voronoi diagrams nomography,
New substation location is determined with the minimum principle of load moment in each substation's supply district；
D) step b)-c is repeated), stop iteration after the precision that substation location movement and DG confidence capacity reach certain, obtains
To target year planning scheme Ik；
(4) according to target year planning scheme Ik, in conjunction with the load level in each stage planning of intermediate year area, preferentially to subtract
Holding is that principle is pushed back to status year by stage from target year, obtains the programme M of intermediate year substationk, the method is as follows:
A) construction scheme for choosing t+1 stage substation is the initial setup state of substation in t stage, utilizes weighted Voronoi diagrams
Drawing method divides the supply district of each substation；
B) substation minimum to institute's on-load capacity carries out station and handles, and updates the setup state of each substation；
C) supply district for dividing each substation again using weighted Voronoi diagrams drawing method, judges whether to meet substation capacity
Constraint and radius of electricity supply constraint otherwise abandon this and station are gone to operate if so, repeating step b)；If judging whether the substation is complete
At dilatation, if so, to the substation carry out volume reduction, and be powered again range division, such as meet substation capacity constraint and
Radius of electricity supply constraint then repeats step b), otherwise enters in next step；
D) operation to the substation is abandoned, updates the setup state of substation and using the program as the final construction in this stage
Scheme enables t=t-1 and return step a) until completing the calculating in each stage, obtains intermediate year planning scheme Mk；
(5) according to target year planning scheme Ik, preferentially to go to station to be returned by stage to status year for principle from target year
It pushes away, obtains the programme N of intermediate year substationk, the method is as follows:
A) construction scheme for choosing t+1 stage substation is the initial setup state of substation in t stage, utilizes weighted Voronoi diagrams
Drawing method divides the supply district of each substation；
B) it is ranked up according to the actual loading rate of substation with substation nominal load rate ratio size, judges that the ratio is minimum
Substation whether completed dilatation, if the substation has completed dilatation to the substation carry out volume reduction operation, otherwise
Station is carried out to the substation to handle, and updates the setup state of each substation；
C) supply district for recalculating substation judges whether to meet substation capacity constraint and substation's radius of electricity supply about
Beam is otherwise abandoned this and is operated into next step if so, repeating step b)；
D) operation to the substation is abandoned, updates the setup state of substation and using the program as the final construction in this stage
Scheme enables t=t-1 and return step a) until completing the calculating in each stage, obtains intermediate year planning scheme Nk；
(6) intermediate year planning scheme M is calculated separatelyk、NkEconomy, and it is same with the optimal scheme of economy in the two
Target year planning scheme IkCollectively form multistage substation's Expansion Planning scheme Fk；
(7) multistage substation Expansion Planning scheme F is calculatedkOverall economy quality；
(8) k=k+1, return step (3) are enabled, until completing the solution of all N number of target year substation capacity assembled schemes；
(9) by multistage planning scheme F1To FNThe optimal scheme of middle overall economy quality becomes as the planning region multistage
Power scheme result.
2. the method according to claim 1, wherein step (7) is specific as follows:
A) it combines substation's load factor to constrain, set the load period of saturation, rate of rise year as 0.4%, solution target year substation builds
If scheme IkThe longest time limit T of workload demand is still able to satisfy after project periodf；
B) with T after status year to the period of saturationfThe investment cost of Nian Neige stage substation is as multistage planning scheme
Economic cost may be expressed as:
In formula: MstationFor intermediate stage investment of substations expense year value, including substation's construction cost and maintenance cost；Mline
For intermediate year track investment expense year value, including line construction expense, maintenance cost and cost of losses, TmEnter saturation for load
The time of phase；R is discount rate；CStation、CFeederFor target year substation and track investment expense year value, CCQFor target year line
Road cost of losses year value.
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