CN108717608A - Million kilowatt beach photovoltaic plant accesses electric network synthetic decision-making technique and system - Google Patents
Million kilowatt beach photovoltaic plant accesses electric network synthetic decision-making technique and system Download PDFInfo
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Abstract
The invention discloses a kind of million kilowatt beach photovoltaic plant access electric network synthetic decision-making technique and systems, including：Design the scheme of several million kilowatt beach photovoltaic access systems；Apparent underproof scheme is rejected in Utilization plan initial screening, determines alternative collection；Establish million kilowatt beach photovoltaic electric station grid connection scheme evaluation system；The index value of each scheme is calculated by simulation software；The weight of each factor is acquired in conjunction with improvement Fuzzy AHP；Schemes ranking is carried out with TOPSIS methods, determines the relative proximities of each scheme and positive ideal scheme；It is preferred plan to select the maximum scheme of relative proximities.The present invention proposes the decision-making technique of million kilowatt beach photovoltaic electric station grid connection scheme, solves the empiricism when selection of conventional photovoltaic access scheme, for improving the scientific of the grid-connected program decisions of million kilowatt beach, generalization, quantification with certain meaning.
Description
Technical field
The invention belongs to technical field of photovoltaic power generation, and in particular to a kind of million kilowatt beach photovoltaic plant access power grid
Synthetic Decision Method and system.
Background technology
With the exacerbation of energy shortage and environmental pollution, photovoltaic generation is worldwide popularized.According to data, entirely
The installed capacity of ball photovoltaic was 50GW in 2010, and the annual adding new capacity 70GW in the whole world in 2016, total capacity has reached
305GW.Wherein, China increases photovoltaic installed capacity newly, accumulative installed capacity respectively reaches 34.54GW, 77.42GW, ranks complete
Ball is the first.2017, China increased photovoltaic installed capacity newly, accumulative installed capacity respectively reaches 52.83GW, 130.25GW.Photovoltaic
Power generation proportion in numerous renewable energy power generations is estimated to reach maximum before and after the year two thousand forty.West area photovoltaic consumption
Scarce capacity, conveying are of high cost, and resulting to abandon optical phenomenon serious.Extensive desert power station different from the past, beach light
Overhead utility is built in receiving-end system more, makes full use of the soil for not yet utilizing or discarding, builds million kilowatt photovoltaic plant, and just
Proximity enters some substation and carries out local consumption, and thus one, the digestion capability of photovoltaic is strong, abandons optical phenomenon and is eased, and keeps away
Exempt from remote transmission electric energy, reduces Transmission Investment and loss, it is good in economic efficiency.
At present for large-scale photovoltaic access power grid after to power grid generate influence and corresponding control strategy research it is more, and
The attention rate that connect-in strategy decision how is carried out for million kilowatt beach photovoltaic plant is relatively low.Photovoltaic generation has apparent
Intermittence, as photovoltaic accesses the increase of scale, system copes with failure and the ability of disturbance is declined, and photovoltaic access point is attached
Nearly trend is complicated and changeable, and prodigious threat is produced to the safe operation of neighbouring power grid.In order to reduce million kilowatt beach light
Overhead utility accesses the influence to electric system, needs to carry out reasonable analysis to access scheme.
The selection of traditional photovoltaic access scheme often relies on expertise, is simply compared several alternatives
To obtain optimal case, but influence of many factors to scheme is not accounted for.When factor needed to be considered is various, research is big
The grid-connected program decisions system of scale and decision-making technique, which just become, needs urgent problem to be solved, and has mathematical theory basic
The extensive concern of scholar has been obtained with the Synthetic Decision Method of tight logic and has been applied to Electric Power Network Planning field.
Invention content
In order to solve the problems, such as to be pointed out in background technology, the invention discloses a kind of million kilowatt beach photovoltaic plants to connect
Enter electric network synthetic decision-making technique；In conjunction with the characteristics of million kilowatt beach photovoltaic electric station grid connection, Decision-Making Evaluation index body is established
System is related to four intermittent security and stability, photovoltaic, economy and scalability aspects；Using improvement Fuzzy AHP
(FAHP) weight is established, carries out scheme preferentially in conjunction with TOPSIS methods, the combination of two kinds of algorithms can make decision process fast high
Effect；Present invention firstly provides million kilowatt beach photovoltaic electric station grid connection program decisions system and methods, have certain innovative
With engineering application value.
To achieve the goals above, the present invention adopts the following technical scheme that：
The first object of the present invention is to disclose a kind of million kilowatt beach photovoltaic plant access electric network synthetic decision-making technique,
Including：
According to existing design specification and engineering experience, several million kilowatt beach photovoltaic electric station grid connection schemes are determined；
Photovoltaic access system model is built, the node voltage qualification rate, the overload number of lines and N-1 of each scheme are calculated
Percent of pass index carries out scheme initial screening, rejects underproof scheme, remaining scheme is established as alternative collection；
Consider the grid-connected influence of million kilowatt beach, establishes million kilowatt beach photovoltaic electric station grid connection program decisions
System；The decision tree includes destination layer, rule layer and indicator layer；
The index value of each connect-in strategy is calculated, establishes raw data matrix；
Constructing matrix is established in conjunction with Fuzzy AHP is improved, and is calculated after being converted into Fuzzy consistent matrix
Partial weight is gradually acquired the comprehensive weight of each factor in decision tree by top-down methods；
Connect-in strategy sequence is carried out with TOPSIS methods, after raw data matrix is weighted standardization, is determined
Positive ideal scheme and ill ideal solution calculate alternative at a distance from positive ideal scheme and ill ideal solution, determine alternative side
Case concentrates the relative proximities of each connect-in strategy and positive ideal scheme；
It is preferred plan to select the maximum scheme of relative proximities.
Further, the carry out scheme initial screening, specially：
The node voltage qualification rate, the overload number of lines and N-1 percent of pass indexs for calculating each scheme, if there is wherein
One index is unsatisfactory for requiring, then is labeled as unqualified scheme.
Further, million kilowatt beach photovoltaic electric station grid connection program decisions system is established, specially：
A. destination layer：Using million kilowatt beach photovoltaic electric station grid connection scheme as decision objective；
B. rule layer：Including four security and stability, photovoltaic intermittence, economy and scalability criterion；
C. indicator layer：Different indexs is corresponded under each criterion；The index is subordinated to corresponding criterion.
Further, the corresponding index of the security and stability includes：
Transient stability is weighed by the average critical clearing time of three phase short circuit fault；
Short circuit current level is determined according to the limit value of each voltage class short circuit current and node short circuit current；
The intermittent corresponding index of the photovoltaic includes：
Power flow changing situation, including Line Flow Reversion and strength of current amplitude of variation；
Voltage fluctuation situation, including peak to peak rate；
The corresponding index of the economy includes：
Economy is built, the cost of investment of new route and transformer is included；
Performance driving economy, including Network Loss Rate and Rate of average load；
The corresponding index of the scalability includes：
Maximum access capacity, including the planning access capacity and extension capacity of photovoltaic or scene.
Further, the index of indicator layer is divided into profit evaluation model index, cost type index and fixed index；Wherein, it imitates
Beneficial type index is positive index, and cost type index is reverse index, and fixed index is appropriate index；
For positive index, original index value is taken；For reverse index and appropriate index, carry out at same chemotactic respectively
Reason；
To treated, index utilizes normalization formula into the nondimensionalization of row index.
Further, constructing matrix is established in conjunction with improvement Fuzzy AHP, and is converted into fuzzy consensus
Partial weight is calculated after matrix, and the comprehensive weight of each factor in decision tree is gradually acquired by top-down methods；Specially：
A, hierarchy Model is established, the hierarchy Model includes destination layer, rule layer, indicator layer and solution layer；
B, rule layer and indicator layer, every layer of established fuzzy judgment matrix F=[f are directed toij]n×n, fijIndicate this layer of factor fi
And fjTo the relative importance of associated last layer factor therewith；
C, fuzzy judgment matrix is converted to fuzzy consistent judgment matrix；
D, partial weight of certain layer of factor relative to associated last layer factor therewith is calculated；
E, weight of all factors of same layer for the relative Link Importance of general objective is calculated according to single ranking results.
Further, connect-in strategy sequence is carried out with TOPSIS methods, calculates alternative and positive ideal scheme and negative reason
The distance for thinking scheme determines that alternative concentrates the relative proximities of each connect-in strategy and positive ideal scheme, specially：
Index value in raw data matrix is normalized, parameter standardizes decision matrix Y；
Numerical value in criterion decision matrix is multiplied by the corresponding weight of each index, obtains weighting standard decision
Matrix Z；
Determine the positive ideal solution Z in weighting standard decision matrix Z+With minus ideal result Z-；
Calculate the Euclidean distance of each alternative connect-in strategy and positive ideal solution
Calculate the Euclidean distance of each alternative connect-in strategy and minus ideal result
According to Euclidean distanceAnd Euclidean distanceDetermine being relatively close to for each alternative connect-in strategy and positive ideal solution
Degree；
According to the size of relative proximities, sort to alternative connect-in strategy.
Further, according to Euclidean distanceAnd Euclidean distanceDetermine each alternative connect-in strategy and positive ideal solution
Relative proximities, specially：
The relative proximities of each alternative connect-in strategy and positive ideal solution are Euclidean distanceWith Euclidean distanceWith it is European
DistanceThe sum of ratio.
The second object of the present invention is to disclose a kind of million kilowatt beach photovoltaic plant access electric network synthetic decision system,
Including server, the server include memory, processor and storage on a memory and the meter that can run on a processor
Calculation machine program, the processor realize following steps when executing described program：
It calculates the node voltage qualification rate of each scheme, overload the number of lines and N-1 percent of pass indexs, at the beginning of carry out scheme
Screening, rejects underproof scheme, remaining scheme is established as alternative collection；
Consider the grid-connected influence of million kilowatt beach, establishes million kilowatt beach photovoltaic electric station grid connection program decisions
System；The decision tree includes destination layer, rule layer and indicator layer；
The index value of each connect-in strategy is calculated, establishes raw data matrix；
Constructing matrix is established in conjunction with Fuzzy AHP is improved, and is calculated after being converted into Fuzzy consistent matrix
Partial weight is gradually acquired the comprehensive weight of each factor in decision tree by top-down methods；
Connect-in strategy sequence is carried out with TOPSIS methods, after raw data matrix is weighted standardization, is determined
Positive ideal scheme and ill ideal solution calculate alternative at a distance from positive ideal scheme and ill ideal solution, determine alternative side
Case concentrates the relative proximities of each connect-in strategy and positive ideal scheme；
It is preferred plan to select the maximum scheme of relative proximities.
The third object of the present invention is to disclose a kind of computer readable storage medium, is stored thereon with computer program, should
Following steps are executed when program is executed by processor：
It calculates the node voltage qualification rate of each scheme, overload the number of lines and N-1 percent of pass indexs, at the beginning of carry out scheme
Screening, rejects underproof scheme, remaining scheme is established as alternative collection；
Consider the grid-connected influence of million kilowatt beach, establishes million kilowatt beach photovoltaic electric station grid connection program decisions
System；The decision tree includes destination layer, rule layer and indicator layer；
The index value of each connect-in strategy is calculated, establishes raw data matrix；
Constructing matrix is established in conjunction with Fuzzy AHP is improved, and is calculated after being converted into Fuzzy consistent matrix
Partial weight is gradually acquired the comprehensive weight of each factor in decision tree by top-down methods；
Connect-in strategy sequence is carried out with TOPSIS methods, after raw data matrix is weighted standardization, is determined
Positive ideal scheme and ill ideal solution calculate alternative at a distance from positive ideal scheme and ill ideal solution, determine alternative side
Case concentrates the relative proximities of each connect-in strategy and positive ideal scheme；
It is preferred plan to select the maximum scheme of relative proximities.
Advantageous effect of the present invention：
The present invention considers million kilowatt beach photovoltaic plant to power grid on the basis of filtering out alternative
It influences, establishes million kilowatt beach photovoltaic electric station grid connection scheme evaluation system, set up security and stability, photovoltaic interval
Property, four criterion of economy and scalability more can comprehensively reflect large-scale photovoltaic access pair including 10 sub- indexs
The influence of power grid；The characteristics of accessing power grid scheme decision in view of million kilowatt photovoltaic selects changing without consistency check
Index weights are determined into Fuzzy AHP, not only make the determination of index weights scientific and reasonable, but also eliminate traditional level
The calculation amount of judgment matrix is changed repeatedly because matrix is inconsistent in analytic approach, while improving the precision of weight；Using applicable
Scheme is carried out in the TOPSIS methods of numeric type index analysis preferentially, with the influence of comprehensive considering various effects and can make full use of original
Beginning data information quickly, intuitively reflects the quality of different schemes；The present invention is directed to beach photovoltaic plant for the first time, it is proposed that hundred
The grid-connected schemes synthesis decision-making technique of ten thousand multikilowatts not only solves the empiricism when selection of conventional photovoltaic access scheme,
Also achieve the sustainable use of Tidal Flat Resources.
Description of the drawings
Fig. 1 is million kilowatt beach photovoltaic access scheme decision flow diagram；
Fig. 2 is million kilowatt beach photovoltaic electric station grid connection scheme evaluation system figure.
Specific implementation mode
The present invention is further illustrated with specific implementation mode below in conjunction with the accompanying drawings.
The invention discloses a kind of million kilowatt beach photovoltaic plants to access electric network synthetic decision-making technique, as shown in Figure 1,
Specific steps include：
(1) according to existing design specification and engineering experience, several million kilowatt beach photovoltaic access systems are designed
Scheme.
(2) photovoltaic access system model, calculate node rate of qualified voltage, the overload number of lines and N-1 percent of pass etc. are built
Index carries out scheme initial screening, rejects apparent underproof scheme, determines alternative collection.
(3) consider the grid-connected influence of million kilowatt beach, establish million kilowatt beach photovoltaic electric station grid connection scheme
Evaluation system establishes the subordinate relation between index.
(4) index system is combined, the index value of each scheme is calculated by simulation software, determines initial data square
Battle array.
(5) constructing matrix is established in conjunction with improving Fuzzy AHP, and after being converted into Fuzzy consistent matrix
Partial weight is calculated, the comprehensive weight of each factor is gradually acquired by top-down methods.The factor include index and with
The corresponding criterion of index.
(6) it uses TOPSIS methods to carry out schemes ranking, determines the relative proximities of each scheme and positive ideal scheme.
(7) it is preferred plan to select the maximum scheme of relative proximities.
Each step is described in detail separately below：
In step (1), according to the characteristics of existing design criteria, photovoltaic electric station grid connection and practical engineering experience, design
The scheme of several million kilowatt beach photovoltaic access systems.
In step (2), preliminary screening is carried out to scheme, mainly eliminates segmentation scheme, to reduce scheme evaluation
In unnecessary work, improve the efficiency of decision-making.This process selects several important fingers without establishing complete detailed index system
Mark is analyzed.
In actual electric network planning, selected design scheme needs meet the needs of basic steady-state load flow of power grid is distributed, this
In the scheme preliminary screening index chosen be：Node voltage qualification rate, the overload number of lines and N-1 percent of pass.There is one to be discontented with
It is sufficient then show that the program is undesirable, without being included in alternative concentration.After eliminating the scheme for being partly unsatisfactory for requiring,
Remaining scheme These parameters are satisfied by requirement, when carrying out final decision, without considering further that these indexs, again to remaining scheme
Other detailed analyses are carried out to calculate.
As photovoltaic accesses the increase of scale, the trend of power grid may be distributed and be had an adverse effect, as accessed
Circuit overload and voltage out-of-limit near point.Rate of qualified voltage VQ refers to the number of nodes N of voltage qualificationQWith Area Node sum NT
Ratio：
The grid-connected transimission power that can change circuit near access point of million kilowatt.When line load rate is excessively high or
When too low, can have an adverse effect to the voltage of neighbouring node.If the load factor of a certain transmission line of electricity is more than 100%, can cause
Circuit fever is serious, should be marked as overload circuit.The overload number of lines is denoted as take certain access scheme after near access point
Overload the quantity of circuit.
Static security analysis contributes to after judging the access of million kilowatt photovoltaic, whether circuit occurs under N-1 forecast accidents
Overload and busbar voltage are out-of-limit.N-1 percent of pass PA is indicated under N-1 forecast accidents, meets the parts number L of N-1 verificationsPIt is total with element
Number LTThe ratio between：
Whether whether a certain element generally out of service can cause voltage out-of-limit and remaining element to overload by verification with its
For judgment criteria.
In step (3), the decision tree of foundation is broadly divided into three layers：Destination layer, rule layer, indicator layer.
A. destination layer：For the final goal of decision, the highest level of system, there are one general, for large-scale photovoltaic
Access system plan decision, target are exactly connect-in strategy.
B. rule layer：Several principal elements of decision objective are influenced, thus it is corresponding with decision objective, it is determined by decision objective
It is fixed.Between each factor independently of each other, it is decision objective service.
C. indicator layer：If necessary, rule layer can divide down indicator layer (sub- factor layer), and sub- factor is subordinated to corresponding upper layer
Factor.Million kilowatt beach photovoltaic electric station grid connection program decisions is said because it is worth with practical engineering application for enhancing
Power is taken, the index of selection is measurable index in quantifiable, engineering.
For beach photovoltaic plant, consider that million kilowatt photovoltaic plant accesses the influence to power grid, and using layering point
The thought of class establishes million kilowatt beach photovoltaic electric station grid connection program decisions evaluation system as shown in Figure 2.With 1,001,000
Watt grade beach photovoltaic electric station grid connection scheme is destination layer, which includes mainly four criterion：Security and stability A, photovoltaic
Intermittent B, economy C and scalability D, each criterion further include corresponding sub- factor.
Index Evaluation Method：
1) security and stability
A. transient stability
Since photovoltaic property is different from conventional power source, no rotary inertia and frequency modulation and voltage modulation ability, million kilowatt beach
After photovoltaic accesses power grid, the reduction of system equivalent inertia can be caused, power grid Transient State Influence need to be verified further.Photovoltaic plant be
The connection type of system affects temporary steady characteristic, transient stability A1It can be by the average critical clearing time (CCT) of three phase short circuit fault
To weigh.Its value is bigger, and expression system is less susceptible to lose stabilization after being disturbed.
B. short circuit current level
After the access of million kilowatt photovoltaic, the variation of node short circuit current can be caused, in order to ensure the safety of power grid, this
When need to carry out the calculating of different voltages grade short circuit current nargin, keep the drop-out current of breaker and the dynamic of various kinds of equipment, heat steady
Constant current is coordinated.Short circuit current level A2Calculation formula is：
I0It is the limit value of each voltage class short circuit current, it can be《Urban power network planning and designing directive/guide》In check in.Ii
It is the short circuit current of node i, N is important busbar sum near selected access point.
2) photovoltaic is intermittent
The electric energy that photovoltaic plant generates depends entirely on sunlight, big by effect of natural conditions, has prodigious uncontrollable
Property.Daytime may reach full hair when sunny, night is unglazed not to generate electricity.Photovoltaic generation has apparent intermittence, for
It is a random perturbation source for power grid, access point nearby trend size, direction change and voltage fluctuation can be caused, it is original
Electrical reticulation design may not consider that the influence of these factors, especially million kilowatt beach photovoltaic plant are mostly built in receiving-end system,
Frequently going out fluctuation can cause supply of electric power unstable, directly affect local electricity consumption, can be generated not to the reliability service of power grid
Profit influences.So utilizing power flow changing situation B1With voltage fluctuation situation B2To reflect influence of the photovoltaic intermittence to electric system.
B1Including Line Flow Reversion B11With strength of current amplitude of variation B12, B2Including peak to peak rate B21。B11Indicate light
Overhead utility contribute from 0% be changed to 100% when, the neighbouring direction of tide changed number of lines of access point, remaining sees below formula：
B12=max | SI100%-SI0%|, i=1,2 ..., M }
Wherein, SI100%And SI0%When indicating that photovoltaic plant output is 100% and 0%, the transimission power of circuit i；UjmaxWith
UjminIndicate photovoltaic contribute from 0% be changed to 100% when, the maximum value and minimum value of a certain busbar j voltages.UjRIt is busbar j
Rated voltage.M (N) is that nearby important line (bus nodes) is total for selected access point.B11、B12And B21It is worth smaller, shows light
The intermittent influence to system of volt is smaller.
3) economy
Economy C includes mainly building economy C1With performance driving economy C2。
Since the construction cost of new energy project is higher, warp should be also pursued while ensureing power grid energy safe and stable operation
Ji maximizing the benefits.Here the cost of investment calculated is in order to carry out project plan comparison, so each scheme same section is herein not
It is calculated, therefore C1The main cost of investment C for considering new route and transformer11.And C2Mainly consider Network Loss Rate C21With
Rate of average load C22。
C21It is a principal economic indicators for weighing access scheme.Network loss is the mistake that electric energy is output to power consumer from power plant
The inevitable energy loss generated in journey, low Network Loss Rate are conducive to network optimization operation.Different from desert photovoltaic plant, by
It is grid-connected consumption nearby in beach photovoltaic plant, without sending electric energy outside on a large scale, grid-connected voltage grade height can not necessarily be reduced
Electric energy loss, different access ways also will produce different via net loss, and network loss be to discriminate between different connect-in strategies one has
Sharp index, C21It is defined as network losses electricity PLAccount for power supply volume PSPercentage：
Line load rate refers to the transimission power S of circuit iiWith the maximum allowable transimission power S of circuitimaxRatio.C22Table
Show the average value of line load rate near access point (N is the number of lines)：
It is judged to be excellent with the economy load 30%~70% of circuit, economy when reflection circuit is run.Work as circuit
Rate of average load is closer to certain certain value (taking 50% here), it is believed that the economic benefit of circuit is best, loss, operating cost synthesis
It is minimum.
4) scalability
In addition to the access capacity of planning, the grid connection capacity of the following photovoltaic may further increase.Beach photovoltaic plant is more
It build ground vast in territory in, wind energy resources also compared with horn of plenty, are also suitable for development wind-powered electricity generation.And scene has very strong complementarity, in vain
The small light of its wind is sufficient, and night is unglazed, and wind is big, and honourable cogeneration has become a development trend.Therefore, scalability D can be used most
Big access capacity D1It weighs, that is, ensures the convergent critical capacity of Load flow calculation, it includes that planning of photovoltaic (or scene) connects
Enter capacity and extension capacity.Index D1Bigger, the access of photovoltaic is smaller to systematic influence, shows that scalability is better.
Classify to index, wherein A1, A21, A22And D1For profit evaluation model index, B11、B12、B21、C11And C21For cost type
Index, C22For fixed index.
Profit evaluation model index (positive index)：Index value is bigger, and scoring is better.
Cost type index (reverse index)：Index value is smaller, and scoring is better.
Fixed index (appropriate index)：For index value closer to some fixed value, scoring is better.
Same chemotactic is carried out firstly the need of to index, i.e., reverse index and appropriate index are turned into positive index.
For positive index, original index value is taken：
xij=x'ij(i=1,2 ..., m；J=1,2 ..., n)
For reverse index, it is with chemotactic formula：
x'ijFor j-th of index value of i-th of scheme, m is the number of scheme, and n is the number of index, xijAfter same chemotactic
Index value, i.e., it is former index is inverted.
For appropriate index, it is with chemotactic formula：
K is that appropriateness is worth, and former index value and appropriateness value are made the difference, and absolute value is a reverse index, i.e., former index value more becomes
It is better to be bordering on appropriateness value, inverted positive index can be turned to its again later.
Index that treated is all positive index, later using normalization formula into the nondimensionalization of row index：
yijFor the index value after standardization.
In step (5), due to grid-connected program decisions should be readily appreciated that, easy to operate, application be by force judgment criteria,
And the influence factor of grid-connected consideration is more, index relationship is complicated, is weighed so can be used and improve Fuzzy AHP
It determines, in conjunction with expert judgments, successively judges again, make full use of the advantage of analytic hierarchy process (AHP) systematization, stratification, make decision process
It is easily understood, the problem that traditional judgment matrix in AHP can also be avoided inconsistent eliminates due to matrix is inconsistent
The calculation amount of judgment matrix is changed repeatedly.Using power method iteration weight, keep the calculating of weight more accurate.Specific steps：A, it builds
Vertical hierarchy Model；B, fuzzy judgment matrix is established；C, fuzzy consistent judgment matrix is established；D, Mode of Level Simple Sequence；E, level
Total sequence.Herein, need construction rules layer to destination layer, A1、A2To criterion A, A21、A22To factor A2, B1、B2To criterion B,
B11、B12To factor B1, C1、C2To criterion C, C21、C22To factor C2Judgment matrix.
A. hierarchy Model is established
Hierarchy Model includes destination layer, rule layer, indicator layer and solution layer, and million kilowatt beach has been established in Fig. 2
Photovoltaic electric station grid connection scheme evaluation index system, including destination layer, rule layer, indicator layer, are the core of hierarchical structure, layer
Secondary structural model increases solution layer, including alternative.
B. fuzzy judgment matrix is established
In FAHP, fuzzy complementary matrix precedence relation matrix is typically expressed as following form：
Matrix F=[fij]n×nIn, fijIndicate this layer of factor fiAnd fjTo the relative importance of a certain factor of last layer.Than
Such as：The corresponding sub- index of some index is relative to the index f in the relative importance or indicator layer of the index in indicator layeriWith
fjImportance of the criterion in relative importance or rule layer relative to target to corresponding criterion.
Matrix element fijIt can be weighed with 0.1~0.9 scaling law (as shown in table 1).It, can first really when establishing matrix element
Determine diagonal element fii=0.5, triangle or lower triangular portions on matrix are then relatively determined two-by-two, further according to fij+fji=1 really
Fixed another semi-matrix.
1 0.1~0.9 quantity scale of table
C. fuzzy consistent judgment matrix is established
Using following formula by matrix F=[fij]n×nBe converted to Fuzzy consistent matrix R=[rij]n×n, consistency inspection can be saved
The process tested.
Thus Fuzzy consistent matrix R=[r are obtainedij]n×n：
D. Mode of Level Simple Sequence
Mode of Level Simple Sequence is exactly the partial weight for calculating certain layer of factor relative to associated last layer factor therewith.Power
Re-computation formula is：
ωiFor weight, α indicates the index factor of significance level difference, and ranging from α >=(n-1)/2, α of parameter alpha is smaller,
It can more reflect and protrude the difference of significance level between factor, so taking α=(n-1)/2 here.
In order to improve the precision of weight, need to be iterated it.First, by Fuzzy consistent matrix R=[rij]n×nConversion
At reciprocal matrix E=[eij]n×n, wherein eij=rij/rji.Then the weight vectors W that will be calculated before(0)=[ω1ω2ω3...
ωn]TAs iteration initial value V0=[v0,1v0,2v0,3...v0,n]T, according to iterative formula V'k=Vk/||Vk||∞And Vk+1=EV'k
(k is iterations), can be obtained feature vector Vk+1With its Infinite Norm | | Vk+1||∞.If | | Vk+1||∞-||Vk||∞≤ε
(ε is iteration precision) sets up, then | | Vk+1||∞For maximum eigenvalue.To Vk+1Final weight vectors are obtained after normalized：
Otherwise, k=k+1 is enabled to carry out next iteration, until meeting the requirements.
E. total hierarchial sorting
Total hierarchial sorting is exactly to calculate all factors of same layer for the relatively important of general objective according to single ranking results
The weight of degree usually carries out from top to bottom.As an example it is assumed that last layer element T1,T2,T3,…,TmThe row of completion
Sequence, weight ωT1,ωT2,ωT3,…,ωTm, with TiCorresponding layer element t1,t2,t3,…,tnSingle weight order is
ωi1,ωi2,ωi3,…,ωinIf (tjWith TiWithout contact then ωij=0), then the total weight order of this layer of element is：
Every layer all carries out in this way, until calculating to last layer of index, completes the sequence of all factors.
In step (6)-(7), TOPSIS methods can make full use of primary data information (pdi), and not limit index quantity strictly,
It can really, intuitively reflect the quality of each scheme, information distortion is small, and the efficiency of decision-making is high, is particularly suitable for numeric type index
Analysis, therefore TOPSIS methods is used to carry out scheme preferentially.Using TOPSIS methods, raw data matrix is weighted standardization
Afterwards, positive ideal scheme and ill ideal solution are determined, calculates alternative later at a distance from positive ideal scheme and ill ideal solution,
If some alternative, near positive ideal scheme, the program is preferred plan.
The step of carrying out decision with TOPSIS methods is as follows：
Assuming that a decision problem has m alternative P1,P2,P3,…,Pm, while having n decision attribute (index) X1,X2,
X3,…,Xn, x'ijFor index value, raw data matrix is constituted, as shown in table 2.
2 raw data matrix of table
Step1：Parameter standardizes decision matrix Y (xijFor the index value after same chemotactic).
Step2：Calculate weighting standard decision matrix Z：
Z=(zij)m×n=ωjyij(i=1,2 ..., m；J=1,2 ..., n)
(wjFor XjWeight, determined by improvement Fuzzy AHP,)
Step3：Determine positive ideal solution Z+With minus ideal result Z-, since index has all turned to positive index, so positive ideal solution
It is made of the maximum value of each attribute in Z, minus ideal result is made of the minimum value of each attribute in Z：
Step4：Calculate the Euclidean distance of each scheme and positive ideal solution
Calculate the Euclidean distance of each scheme and minus ideal result
Step5：Calculate the relative proximities of each scheme and positive ideal solution
It is bigger, it was demonstrated that the program is closer from ideal solution, and the program is more excellent.
Step6：According toSize, to ranking alternatives；It is preferred plan to select the maximum scheme of relative proximities.
The present invention further discloses a kind of million kilowatt beach photovoltaic plants to access electric network synthetic decision system, including
Server, the server include memory, processor and storage on a memory and the computer that can run on a processor
Program, the processor realize following steps when executing described program：
It calculates the node voltage qualification rate of each scheme, overload the number of lines and N-1 percent of pass indexs, at the beginning of carry out scheme
Screening, rejects underproof scheme, remaining scheme is established as alternative collection；
Consider the grid-connected influence of million kilowatt beach, establishes million kilowatt beach photovoltaic electric station grid connection program decisions
System；The decision tree includes destination layer, rule layer and indicator layer；
The index value of each connect-in strategy is calculated, establishes raw data matrix；
Constructing matrix is established in conjunction with Fuzzy AHP is improved, and is calculated after being converted into Fuzzy consistent matrix
Partial weight is gradually acquired the comprehensive weight of each factor in decision tree by top-down methods；
Connect-in strategy sequence is carried out with TOPSIS methods, after raw data matrix is weighted standardization, is determined
Positive ideal scheme and ill ideal solution calculate alternative at a distance from positive ideal scheme and ill ideal solution, determine alternative side
Case concentrates the relative proximities of each connect-in strategy and positive ideal scheme；
It is preferred plan to select the maximum scheme of relative proximities.
The present invention further discloses a kind of computer readable storage mediums, are stored thereon with computer program, the program
Following steps are executed when being executed by processor：
It calculates the node voltage qualification rate of each scheme, overload the number of lines and N-1 percent of pass indexs, at the beginning of carry out scheme
Screening, rejects underproof scheme, remaining scheme is established as alternative collection；
Consider the grid-connected influence of million kilowatt beach, establishes million kilowatt beach photovoltaic electric station grid connection program decisions
System；The decision tree includes destination layer, rule layer and indicator layer；
The index value of each connect-in strategy is calculated, establishes raw data matrix；
Constructing matrix is established in conjunction with Fuzzy AHP is improved, and is calculated after being converted into Fuzzy consistent matrix
Partial weight is gradually acquired the comprehensive weight of each factor in decision tree by top-down methods；
Connect-in strategy sequence is carried out with TOPSIS methods, after raw data matrix is weighted standardization, is determined
Positive ideal scheme and ill ideal solution calculate alternative at a distance from positive ideal scheme and ill ideal solution, determine alternative side
Case concentrates the relative proximities of each connect-in strategy and positive ideal scheme；
It is preferred plan to select the maximum scheme of relative proximities.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. million kilowatt beach photovoltaic plant accesses electric network synthetic decision-making technique, which is characterized in that including：
According to existing design specification and engineering experience, several million kilowatt beach photovoltaic electric station grid connection schemes are determined；
Photovoltaic access system model is built, the node voltage qualification rate, the overload number of lines and N-1 for calculating each scheme pass through
Rate index carries out scheme initial screening, rejects underproof scheme, remaining scheme is established as alternative collection；
Consider the grid-connected influence of million kilowatt beach, establishes million kilowatt beach photovoltaic electric station grid connection program decisions body
System；The decision tree includes destination layer, rule layer and indicator layer；
The index value of each connect-in strategy is calculated, establishes raw data matrix；
Constructing matrix is established in conjunction with Fuzzy AHP is improved, and part is calculated after being converted into Fuzzy consistent matrix
Weight is gradually acquired the comprehensive weight of each factor in decision tree by top-down methods；
Connect-in strategy sequence is carried out with TOPSIS methods, after raw data matrix is weighted standardization, determines correct principle
Think scheme and ill ideal solution, calculates alternative at a distance from positive ideal scheme and ill ideal solution, determine alternative collection
In each connect-in strategy and positive ideal scheme relative proximities；
It is preferred plan to select the maximum scheme of relative proximities.
2. million kilowatt beach photovoltaic plant as described in claim 1 accesses electric network synthetic decision-making technique, which is characterized in that
The carry out scheme initial screening, specially：
The node voltage qualification rate, the overload number of lines and N-1 percent of pass indexs for calculating each scheme, if there is one of them
Index is unsatisfactory for requiring, then is labeled as unqualified scheme.
3. million kilowatt beach photovoltaic plant as described in claim 1 accesses electric network synthetic decision-making technique, which is characterized in that
Million kilowatt beach photovoltaic electric station grid connection program decisions system is established, specially：
A. destination layer：Using million kilowatt beach photovoltaic electric station grid connection scheme as decision objective；
B. rule layer：Including four security and stability, photovoltaic intermittence, economy and scalability criterion；
C. indicator layer：Different indexs is corresponded under each criterion；The index is subordinated to corresponding criterion.
4. million kilowatt beach photovoltaic plant as claimed in claim 3 accesses electric network synthetic decision-making technique, which is characterized in that
The corresponding index of the security and stability includes：
Transient stability is weighed by the average critical clearing time of three phase short circuit fault；
Short circuit current level is determined according to the limit value of each voltage class short circuit current and node short circuit current；
The intermittent corresponding index of the photovoltaic includes：
Power flow changing situation, including Line Flow Reversion and strength of current amplitude of variation；
Voltage fluctuation situation, including peak to peak rate；
The corresponding index of the economy includes：
Economy is built, the cost of investment of new route and transformer is included；
Performance driving economy, including Network Loss Rate and Rate of average load；
The corresponding index of the scalability includes：
Maximum access capacity, including the planning access capacity and extension capacity of photovoltaic or scene.
5. million kilowatt beach photovoltaic plant as claimed in claim 3 accesses electric network synthetic decision-making technique, which is characterized in that
The index of indicator layer is divided into profit evaluation model index, cost type index and fixed index；Wherein, profit evaluation model index refers to for forward direction
Mark, cost type index are reverse index, and fixed index is appropriate index；
For positive index, original index value is taken；For reverse index and appropriate index, same chemotactic processing is carried out respectively；
To treated, index utilizes normalization formula into the nondimensionalization of row index.
6. million kilowatt beach photovoltaic plant as described in claim 1 accesses electric network synthetic decision-making technique, which is characterized in that
Constructing matrix is established in conjunction with Fuzzy AHP is improved, and part power is calculated after being converted into Fuzzy consistent matrix
Weight, the comprehensive weight of each factor in decision tree is gradually acquired by top-down methods；Specially：
A, hierarchy Model is established, the hierarchy Model includes destination layer, rule layer, indicator layer and solution layer；
B, rule layer and indicator layer, every layer of established fuzzy judgment matrix F=[f are directed toij]n×n, fijIndicate this layer of factor fiAnd fjIt is right
The relative importance of associated last layer factor therewith；
C, fuzzy judgment matrix is converted to fuzzy consistent judgment matrix；
D, partial weight of certain layer of factor relative to associated last layer factor therewith is calculated；
E, weight of all factors of same layer for the relative Link Importance of general objective is calculated according to single ranking results.
7. million kilowatt beach photovoltaic plant as described in claim 1 accesses electric network synthetic decision-making technique, which is characterized in that
Connect-in strategy sequence is carried out with TOPSIS methods, alternative is calculated at a distance from positive ideal scheme and ill ideal solution, determines
Alternative concentrates the relative proximities of each connect-in strategy and positive ideal scheme, specially：
Index value in raw data matrix is normalized, parameter standardizes decision matrix Y；
Numerical value in criterion decision matrix is multiplied by the corresponding weight of each index, obtains weighting standard decision matrix
Z；
Determine the positive ideal solution Z in weighting standard decision matrix Z+With minus ideal result Z-；
Calculate the Euclidean distance of each alternative connect-in strategy and positive ideal solution
Calculate the Euclidean distance of each alternative connect-in strategy and minus ideal result
According to Euclidean distanceAnd Euclidean distanceDetermine the relative proximities of each alternative connect-in strategy and positive ideal solution；
According to the size of relative proximities, sort to alternative connect-in strategy.
8. million kilowatt beach photovoltaic plant as claimed in claim 7 accesses electric network synthetic decision-making technique, which is characterized in that
According to Euclidean distanceAnd Euclidean distanceDetermine the relative proximities of each alternative connect-in strategy and positive ideal solution, specially：
The relative proximities of each alternative connect-in strategy and positive ideal solution are Euclidean distanceWith Euclidean distanceAnd Euclidean distanceThe sum of ratio.
9. a kind of million kilowatt beach photovoltaic plant accesses electric network synthetic decision system, which is characterized in that including server, institute
Server is stated to include memory, processor and store the computer program that can be run on a memory and on a processor, it is described
Processor realizes following steps when executing described program：
The node voltage qualification rate, the overload number of lines and N-1 percent of pass indexs for calculating each scheme, carry out scheme primary dcreening operation
Choosing, rejects underproof scheme, remaining scheme is established as alternative collection；
Consider the grid-connected influence of million kilowatt beach, establishes million kilowatt beach photovoltaic electric station grid connection program decisions body
System；The decision tree includes destination layer, rule layer and indicator layer；
The index value of each connect-in strategy is calculated, establishes raw data matrix；
Constructing matrix is established in conjunction with Fuzzy AHP is improved, and part is calculated after being converted into Fuzzy consistent matrix
Weight is gradually acquired the comprehensive weight of each factor in decision tree by top-down methods；
Connect-in strategy sequence is carried out with TOPSIS methods, after raw data matrix is weighted standardization, determines correct principle
Think scheme and ill ideal solution, calculates alternative at a distance from positive ideal scheme and ill ideal solution, determine alternative collection
In each connect-in strategy and positive ideal scheme relative proximities；
It is preferred plan to select the maximum scheme of relative proximities.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor
Following steps are executed when execution：
The node voltage qualification rate, the overload number of lines and N-1 percent of pass indexs for calculating each scheme, carry out scheme primary dcreening operation
Choosing, rejects underproof scheme, remaining scheme is established as alternative collection；
Consider the grid-connected influence of million kilowatt beach, establishes million kilowatt beach photovoltaic electric station grid connection program decisions body
System；The decision tree includes destination layer, rule layer and indicator layer；
The index value of each connect-in strategy is calculated, establishes raw data matrix；
Constructing matrix is established in conjunction with Fuzzy AHP is improved, and part is calculated after being converted into Fuzzy consistent matrix
Weight is gradually acquired the comprehensive weight of each factor in decision tree by top-down methods；
Connect-in strategy sequence is carried out with TOPSIS methods, after raw data matrix is weighted standardization, determines correct principle
Think scheme and ill ideal solution, calculates alternative at a distance from positive ideal scheme and ill ideal solution, determine alternative collection
In each connect-in strategy and positive ideal scheme relative proximities；
It is preferred plan to select the maximum scheme of relative proximities.
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