CN103714398A - Power distribution network expanding device and method based on anti-disaster denaturation indexes - Google Patents
Power distribution network expanding device and method based on anti-disaster denaturation indexes Download PDFInfo
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Abstract
The invention provides a power distribution network expanding device and method based on anti-disaster denaturation indexes and belongs to the field of power distribution network expansion planning. The method includes the first step of determining a key link of an actual power distribution network, wherein the key link further comprises a key line and a key transformer, the second step of obtaining anti-disaster denaturation analysis and individual measure lists of the key link of the power distribution network, and the third step of expanding the key link of the power distribution network with the minimum investment cost of the power distribution network as one of targets. According to the power distribution network expanding device and method based on the anti-disaster denaturation indexes, the process of comprehensively evaluating key line indexes to determine the key line is combined with a line betweenness, a line load level coefficient and a branch correlation coefficient, and meanwhile the probability of line faults is referred to; in the process of determining the key transformer in the power distribution network, the intimacy degree between the transformers is referred to, and meanwhile the weight of influence of the transformers in an electric system is also considered; consequently, the key link determined in this way can be more accurate.
Description
Technical field
The invention belongs to power distribution network Expansion Planning field, particularly a kind of based on combating a natural disaster the device and method of sex change index expansion power distribution network.
Background technology
No matter be traditional power distribution network or intelligent distribution network, high-quality reliable power supply is all one of common-denominator target.Limited by technical conditions, tradition power distribution network is difficult to realize the stable supply of electric power continuous under hazardous condition, can only rely on the Passive Defence pattern of repairing afterwards, under Global climate change causes overall background that disaster takes place frequently, power distribution network is needed the active disaster defense technique of development badly, reduces the heavy losses that disaster causes.On the other hand, along with the proposition of intelligent distribution network concept and the development of correlation technique, power distribution network has possessed under theoretical foundation and technical conditions, the especially hazardous condition of active disaster orientation of defenses development becomes an important option to the power supply supportability of social life line.
At intelligent distribution network still in development under the current conditions in stage, build under power distribution network hazardous condition and can face following challenge to the power supply supportability of lifeline: first, the scale of power distribution network is increasing, network structure becomes increasingly complex, and the labile factor that equipment failure, load variations etc. affects power supply safety gets more and more; Secondly, along with the energetically support of country to green clean energy resource, distributed power source, energy storage device, electric automobile access electrical network on a large scale, and demand response and bi-directional current produce significant impact to distribution net work structure and operational management; The 3rd, power distribution network node scale is large, metric data is many, but because the reason coverage rates such as cost are lower and the quality of data is not good, above-mentioned three reasons directly cause operating personnel to be difficult to effectively control the various states of power distribution network and variation tendency, both affect the power distribution network reliable power supply ability under normal condition, also affected the power supply supportability to lifeline user under hazardous condition.Add the less consideration of distribution network planning stage and combat a natural disaster demand, lack and combat a natural disaster accordingly planning technology, further weakened the disaster defence capability of power distribution network.
Summary of the invention
The deficiency existing for prior art, the object of this invention is to provide a kind of based on combating a natural disaster the device and method of sex change index expansion power distribution network, to reach the power supply reliability of lifeline user under power supply reliability, the especially hazardous condition that promotes power distribution network, improve the object of electric grid investment income.
Technical scheme of the present invention is achieved in that a kind of based on combating a natural disaster the device of sex change index expansion power distribution network, comprising:
Data acquisition and monitoring module: for gathering voltage analog, current analog amount, switching value and constraint information, and analog input amount is converted to digital quantity;
Communication module: for reception and the transmission in information between data acquisition and monitoring module and data processing module, between data processing module and input/output module, between data processing module and database;
Input/output module: for according to the information of the data processing module receiving, by operating personnel, system monitored and control;
Database module: combat a natural disaster sex change index and candidate's single measure record for generating forecast failure database, node incidence matrix, key link, complete data backup and management;
Data processing module: for power distribution network key link being carried out to identification, generating forecast failure pattern base, combat a natural disaster sex change analyzing and processing;
In described data processing module, also further comprise:
Generate forecast failure pattern base unit: according to historical data, set up the stoppage in transit causing because of maintenance corresponding to fault corresponding to each key link or each key link;
Dynamic analysis network topology unit: actual power distribution network is abstracted into electricity distribution network model and represents, according to the structure of actual power distribution network, mark out transformer node and distribution line in electricity distribution network model;
Combat a natural disaster sex change analysis and processing unit: for each key link fault of power distribution network being combated a natural disaster to sex change analysis, obtain combating a natural disaster sex change index, and generate individual event power distribution network expansionary measures table;
Expanding element: use fusion ant colony taboo particle cluster algorithm to carry out the expansion of power distribution network key link;
Optimum expansion recognition unit: whether the removal of load amount that judges power distribution network is zero; If so, choose optimum expansionary measures set; If no, adjust the threshold values that intelligence is chosen power distribution network key link unit, again choose key link;
Intelligence is chosen key link unit: for threshold value is set, according to the threshold values of setting, identify critical circuits and crucial transformer simultaneously.
Based on combating a natural disaster the method for sex change index expansion power distribution network, expansion process flow diagram is shown in accompanying drawing 1, comprises the following steps:
Step 1: determine the key link of actual power distribution network, described key link further comprises critical circuits and crucial transformer, and concrete steps are as follows
Step 1.1: actual power distribution network is abstracted into electricity distribution network model and represents, according to the structure of actual power distribution network, mark out transformer node and distribution line in electricity distribution network model;
Step 1.2: the critical circuits that utilizes the method identification practical power systems of improved comprehensive assessment circuit critical index: on the basis of the betweenness of distribution network line, load level coefficient, three indexs of branch road correlation coefficient, further introduce the probability of line failure, the product of comprehensive these four indexs forms critical index, critical index is sorted, and the larger expression of critical index is more crucial;
Step 1.3: utilize fuzzy comprehensive evaluation method to carry out locator key transformer: model fuzzy matrix R represents the contact tightness degree between each transformer node in power distribution network, utilize the fuzzy weight vector A of reaction transformer weighing factor in distribution network, using the synthetic B of fuzzy weight vector A and fuzzy matrix R as the final appraisal results matrix of being passed judgment on object, in this evaluation result matrix, if element value is greater than predefined threshold value, the transformer of this element representation is crucial transformer;
Step 2: the acquisition of combating a natural disaster sex change analysis and single measure table of power distribution network key link, concrete steps are as follows:
Step 2.1: all key links in power distribution network are combated a natural disaster to sex change analysis: suppose first respectively in power distribution network certain transformer or certain circuit breaks down or need to overhaul, then respectively the transformer that breaks down or need to overhaul or circuit are combated a natural disaster to sex change analysis, the described sex change analytic process of combating a natural disaster is: isolated fault, load restoration, calculating Distribution Network Frame are combated a natural disaster the network reconfiguration that sex change, load balancing, the removal of load amount minimum of take are target; What utilization combated a natural disaster that sex change obtains all transformers and all distribution lines in whole distribution combats a natural disaster sex change index.
Step 2.2: according to the sex change index of combating a natural disaster of step 2.1, determine the expansionary measures carry out for power distribution network key link, determine each expansionary measures with its relation between corresponding expense;
Step 3: the power distribution network investment cost of take is minimum is target, meets following constraint condition simultaneously:
Constraint condition 1: the accumulative total removal of load amount that meets power distribution network is zero;
Constraint condition 2: the electric current that flows through power distribution network should meet following constraint condition:
I≤I
i,max
In formula, I represents to flow through the electric current of power distribution network, I
i, maxrepresent that power distribution network i branch road allows upper current limit;
Constraint condition 3: voltage should meet following constraint condition:
U
min≤U≤U
max
In formula, U represents distribution network voltage, U
minthe minimum voltage value that power distribution network allows, U
maxit is the maximum voltage value that power distribution network allows;
Key link to power distribution network under the condition that meets above-mentioned target and constraint is expanded;
The described key link to power distribution network is expanded, and specifically comprises the following steps:
Step 3.1: use fusion ant colony taboo particle cluster algorithm to carry out the Expansion Planning of power distribution network;
(1) utilize ant group algorithm to determine the set of power distribution network expansionary measures: the input-output ratio of first calculating every kind of expansionary measures according to each individual event expansionary measures, input-output ratio is sorted, the Expansion Planning measure of rear 20% in collating sequence is put into taboo list, in remaining expansionary measures, select, select the corresponding expansionary measures of input-output ratio maximal value to expand power distribution network, now, the removal of load amount of power distribution network reduces, and produces new distribution network; According to the larger principle of the larger transition probability of input-output ratio, in remaining expansionary measures, select again, the expansionary measures that use is chosen is expanded again to power distribution network, now, the removal of load amount of power distribution network further reduces, and produces another new distribution network, repeats this process, until the removal of load amount of power distribution network is zero, obtain the set of a plurality of power distribution network expansionary measures;
(2) utilize particle cluster algorithm to determine the optimum expansionary measures of power distribution network: the input by the power distribution network expansionary measures collection producing in (1) as particle cluster algorithm, utilize particle cluster algorithm, export optimum expansionary measures;
Step 4: power distribution network is expanded according to the determined expansionary measures of step 3.
Beneficial effect of the present invention: the present invention not only combines betweenness, line load horizontal coefficients, the branch road correlation coefficient of circuit in comprehensive assessment circuit critical index is determined the process of critical circuits, has also considered the probability of line failure; In the process of the crucial transformer in determining power distribution network, not only consider the level of intimate between transformer, also considered the weight that transformer affects in electric system; Definite like this key link is more accurate.To power distribution network key link combat a natural disaster the state of electric distribution network of sex change analysis can reflect intuitively power distribution network key link fault time, and the innovative approach of Expansion Planning is proposed targetedly, for reaching accumulative total removal of load amount, be that zero network reconfiguration has been made place mat.Adopt fusion ant colony taboo particle cluster algorithm to carry out the optimum expansion of power distribution network, this algorithm fusion ant group avoid particle cluster algorithm, give full play to ant group algorithm and there is positive feedback, parallel computation, strong robustness, in ant group algorithm, introduced taboo list and carried out the node of advancing of mark and standard ant, taboo list has been eliminated input-output ratio Δ L '
k ∑/ C
ilittle measure node, has saved search time; The present invention takes full advantage of in certain iteration of ant group Tabu search algorithm producing the feature of some paths, has reasonably avoided again ant group algorithm long shortcoming search time; Use the measure path of ant group Tabu search algorithm generation as the measure path particle in particle cluster algorithm, because particle population number is not too large for this reason, can not cause particle swarm optimization algorithm to be absorbed in local optimum, brought into play again that particle swarm optimization algorithm search speed is fast, efficiency is high, the simple advantage of algorithm, therefore fusion ant colony taboo particle swarm optimization algorithm can well obtain target optimum solution.
Accompanying drawing explanation
Fig. 1 is present embodiment based on combating a natural disaster the apparatus structure block diagram of sex change index expansion power distribution network;
Fig. 2 is present embodiment data acquisition and monitoring modular structure block diagram;
Fig. 3 is present embodiment data processing module structured flowchart;
Fig. 4 is present embodiment based on combating a natural disaster the process flow diagram of sex change index expansion power distribution network;
Fig. 5 is the simplified model of distribution networks figure before present embodiment expansion;
Fig. 6 is the process flow diagram that present embodiment is found critical circuits;
Fig. 7 is present embodiment bus class malfunction analysis procedure process flow diagram;
Fig. 8 is present embodiment fusion ant colony taboo particle cluster algorithm Expansion Planning process flow diagram flow chart;
Fig. 9 is the simplified model of distribution networks figure after present embodiment expansion.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
The device that present embodiment adopts comprises data acquisition and monitoring module, communication module, input/output module, data processing module and database module, and general structure as shown in Figure 1.
Data acquisition and monitoring module in present embodiment mainly adopts the distributed data acquisition module based on RS-485---ADAM4000 series module, this is a kind of reliable SCADA system module, ADAM-4117 module gathers analog quantity, its A/D converts the function that analog input amount is converted to as far as possible exactly to digital quantity, ADAM-4050 module gathers digital switch quantity, and (present embodiment mainly refers to the state of switch, as with 0 representation switch state being closure, with the state of 1 representation switch, be disconnection) and constraint information (present embodiment comprises and refers to that removal of load falls, maximum voltage and maximum current), network topology analysis, the electric network state that institute's Information Monitoring is mainly used in data processing module detects, failure message records, constraint condition monitors, the supervision module of wherein using is comprised of WAMS system, adopt synchronous phase angle measuring technique, by the synchronous phase angle measuring unit (PMU) of the crucial measuring point of layout the whole network progressively, realization gathers the real time high-speed rate of the whole network synchronous phase angle and electrical network general data, and its structure as shown in Figure 2.
Data processing module in present embodiment comprises microprocessor, storer, timer and parallel communication interface etc.Microprocessor is carried out the program in ROM (read-only memory) that leaves in, the data analysis being inputed in random access memory by data acquisition system (DAS) is processed, be mainly used in key link identification, generate forecast failure pattern base, combat a natural disaster sex change analyzing and processing, algorithm pattern is realized and the decision system Core Feature such as optimum expansion identification.Its structure as shown in Figure 3.
In described data processing module, also further comprise:
Generate forecast failure pattern base unit: according to historical data, set up the stoppage in transit causing because of maintenance corresponding to fault corresponding to each key link or each key link.
Combat a natural disaster sex change analysis and processing unit: that carries out each key link fault of power distribution network combats a natural disaster sex change analysis, obtain combating a natural disaster sex change index, and generate individual event expansionary measures table.
Expanding element: use fusion ant colony taboo particle cluster algorithm to carry out the expansion of power distribution network key link.
Optimum expansion recognition unit: whether the removal of load amount that judges power distribution network is zero, if so, chooses optimum expansionary measures set; If no, adjust the threshold values that intelligence is chosen power distribution network key link unit, again choose key link.
Dynamic analysis network topology unit: actual power distribution network is abstracted into electricity distribution network model and represents, according to the structure of actual power distribution network, mark out transformer node and distribution line in electricity distribution network model.
Intelligence is chosen key link unit: according to predefined threshold values, identify critical circuits and crucial transformer.
Communication module: comprise communication interface circuit and Interface realization multi-computer communication or networking, the information that mainly realizes receives, transmission is controlled.In present embodiment, adopt RS-485 standard interface and the optical fiber communication mode of running simultaneously, the communication speed improving under networked environment guarantees data transmission accuracy and security simultaneously.
Input/output module: comprise the man-machine interaction input-output device such as push-button unit, display unit, microcomputer recognition system and operating personnel's interactive interface, realizes operations staff to the supervision of system and control.
Database module: combat a natural disaster sex change index and candidate's single measure record for generating forecast failure database, node incidence matrix, key link, complete data backup and management function.
Present embodiment adopt based on combating a natural disaster the method for sex change index expansion power distribution network, its flow process as shown in Figure 1, comprises the following steps:
Step 1: determine the key link of actual power distribution network, described key link further comprises critical circuits and crucial transformer, and concrete steps are as follows
Step 1.1: actual power distribution network is abstracted into electricity distribution network model and represents, according to the structure of actual power distribution network, mark out transformer node and distribution line in electricity distribution network model.In present embodiment, actual power distribution network, comprise that feeder line section region has 39, outlet switch has 13, and bus has 5, and main-transformer has 5, transformer station has 3, high pressure inlet wire has 2 paths, and wherein #1 high pressure inlet wire path adopts two meeting wiring on the same tower, connects mode access A and B Liang Zuo transformer station by T.Actual power distribution network is built to electricity distribution network model, as shown in Figure 5, suppose that the electric limit that each master is depressor is 2000A, the electric limit of each 10kV bus is 2000A, the rated load of other switch and wire is 400A, and the load of each region and feeder line section is as shown in figure bracket.Circle in figure represents switch, and solid expression is closed, and hollow expression disconnects, its numbering of the numeral on switch side.For example the B of transformer station is exactly important transformer station's node, and 3# main transformer is exactly a crucial transformer node, and #1 high pressure inlet wire and #2 high pressure inlet wire are exactly critical circuits.
Step 1.2: the critical circuits that utilizes the method identification practical power systems of improved comprehensive assessment circuit critical index: on the basis of the betweenness of distribution network line, line load horizontal coefficients, three indexs of branch road correlation coefficient, further introduce the probability of line failure, the product of comprehensive these four indexs forms critical index, critical index is sorted, the larger expression of critical index is more crucial, and its process as shown in Figure 6.
The betweenness B of distribution network line
icomputing formula is:
In formula, BB
irefer to and take the betweenness of the circuit i that the inverse of transmission line of electricity trend is weight, B
maxmaximal value for all circuit betweenness in electrical network.
Line load horizontal coefficients computing formula is:
In formula, P
irefer to the current through-put power of circuit i, P
imaxfor the limit transmitted power of circuit i, at circuit i, do not occur when out-of-limit, have 0≤L
i≤ 1.
The implication of branch road correlation coefficient is to disconnect after this circuit, the rate of change sum of the active power of other all circuits in electrical network, and the branch road correlation coefficient of branch road i is defined as follows:
Wherein, N represents the number of transmission line of electricity, P
jthe initial active power that represents j bar circuit, Δ P
jthe variation of the active power of j bar circuit after expression disconnection i bar circuit.
The probability that circuit i is broken down is designated as P
l, comprehensive four kinds of indexs above, the critical index that circuit i is evaluated in definition is as follows:
η
i＝B
i×L
i×G
i×P
l
This index combines the probability of betweenness, line load horizontal coefficients, branch road correlation coefficient and the line failure of circuit, and critical index is sorted, and can pick out a series of critical circuits of electric system.In present embodiment, η
ithreshold value is generally set as 0.001, on this threshold value, is made as critical circuits.
Step 1.3: utilize fuzzy comprehensive evaluation method to carry out locator key transformer: model fuzzy matrix R represents the contact tightness degree between each transformer node in power distribution network, utilize the fuzzy weight vector A of reaction transformer weighing factor in distribution network, using the synthetic B of fuzzy weight vector A and fuzzy matrix R as the final appraisal results matrix of being passed judgment on object, in this evaluation result matrix, if element value is greater than predefined threshold value, the transformer of this element representation is crucial transformer;
By the method for fuzzy comprehensive evoluation, identify crucial transformer.For being evaluated object, affect the set that its several factors form, be referred to as set of factors.If total m factor, is respectively u
1, u
2..., u
m, being expressed as set form is U={u
1, u
2..., u
m.Each is because have several comments, and the set that these comments form is referred to as comment collection.If total n comment, is respectively v
1, v
2..., v
n.If use r
ijrepresent the degree of membership of i factor to j comment, so just draw i factor u
isimple element evaluation collection: r
i=(r
i1, μ
i2..., μ
in).
M the evaluation collection of having factor in mind just forms a total evaluation matrix R like this, and the fuzzy relation between set of factors and comment collection can be used Judgement Matrix
Represent, wherein, 0≤r
ij≤ μ
r(u
i, v
j)≤1, i=1,2 ..., m; J=1,2 ..., n, r
ijmore this node and other node affinity are larger.
Obtain such fuzzy relation matrix, be still not enough to things to make evaluation.The attention degree of estimator to various factors, i.e. the power of each factor, can regard the fuzzy subset of set of factors U as, is designated as
Wherein
and a kind of balance of element reflection to factors in A, the weight that each node transformer acts in whole power distribution network.
In R, different row has reflected that certain is evaluated things and usually sees the subjection degree to each grade fuzzy subset from different Dan Yin, with fuzzy weight vector, A carries out different row comprehensively, just can obtain this appraised things through discussion the thing subjection degree to each grade fuzzy subset in general, i.e. fuzzy overall evaluation result vector.
Introduce a fuzzy subset on B, claim fuzzy evaluation, claim again decision set.The synthetic B of A and R is regarded as to the final evaluation of being made passing judgment on object after the comprehensive various factors of estimator, i.e. fuzzy comprehensive evoluation.So the mathematical model of fuzzy comprehensive evoluation is
In formula, "." represent fuzzy operation symbol, different to the definition of this operational symbol, corresponding different fuzzy synthetic evaluation model is the computing of matrix multiplication herein.For matrix B, only need to extract diagonal entry, B
iithe significance level of the transformer node of representative numbering i, B
iithis transformer of larger explanation is more important in power distribution network, so just can locator key transformer; Thereby discovery key link.In present embodiment, threshold value is generally set as 1, and evaluation of estimate is greater than the crucial transformer that is set as of threshold values.
Step 2: the acquisition of combating a natural disaster sex change analysis and single measure table of power distribution network key link, concrete steps are as follows:
Step 2.1: all key links in power distribution network are combated a natural disaster to sex change analysis: suppose first respectively in power distribution network certain transformer or certain circuit breaks down or need to overhaul, then respectively the transformer that breaks down or need to overhaul or circuit are combated a natural disaster to sex change analysis, the described sex change analytic process of combating a natural disaster is: isolated fault, load restoration, calculating Distribution Network Frame are combated a natural disaster the network reconfiguration that sex change, load balancing, the removal of load amount minimum of take are target, wherein isolated fault is about to can disconnecting by disjunction node of set fault bus periphery, just isolated fault, load restoration is exactly that search guilty culprit is communicated with the interconnection switch in system, the switch that area peripheral edge and normal power supply region are got in touch with mutually that perfects that closes and be subject to that bus-bar fault affects, obtain a new method of operation, the rack that calculates power distribution network is combated a natural disaster sex change index, load balancing also calculates power distribution network and the safe coefficient of electrical equipment, , judgement operates in whether safety of power distribution network under which, the For Distribution Networks Reconfiguration that to carry out take removal of load amount minimum be target if dangerous, and acquired results is calculated to power distribution network combat a natural disaster sex change index, in order to removal of load amount minimum, it is the network reconfiguration method of target, bus class malfunction analysis procedure as shown in Figure 7 for example.
What utilization combated a natural disaster that sex change analysis obtains all transformers and all distribution lines in whole distribution combats a natural disaster sex change index; The power distribution network key link obtaining combat a natural disaster the analysis integrated index of sex change; The static security degree D of the power distribution network under determination of power load situation
a, consider the former of grid structure thereby the total load Δ L being got rid of
h Σ, the total load shedding amount of the power distribution network static security Δ L under determination of power load situation
r Σ, the power distribution network that considers the capacity limit of each electrical equipment and distribution network shelf structure restriction itself on average combats a natural disaster variable coefficient
the removal of load amount Δ L of power distribution network after each key link breaks down
k,i, consider the minimum total load amount Δ L that got rid of after the present power distribution network maximum potential of giving full play to of Distribution Network Frame structure and electrical equipment capacity limit after breaking down
k Σ, between These parameters, meet relational expression:
Step 2.2: according to the sex change index of combating a natural disaster of step 2.1, determine the expansionary measures carry out for power distribution network key link, determine each expansionary measures with its relation between corresponding expense;
According to analysis result, arrange to generate: power distribution network key link is combated a natural disaster sex change analysis indexes complete list.
Table 1 power distribution network key link is combated a natural disaster sex change analysis indexes table
Power distribution network key link is through combating a natural disaster after sex change analyzes, by the removal of load value of each key link, key link, for guaranteeing that the Expansion Planning measure of this key link reliability and expense classify a table as, delete on this basis after redundancy (repetition) the individual event Expansion Planning measure in CS, form a candidate's Expansion Planning single measure complete list, as shown in table 2:
Table 2 candidate Expansion Planning single measure complete list
| Expansion Planning single measure | Expense |
| cs 1 | c 1 |
| cs 2 | c 2 |
| … | … |
| cs k | c k |
| … | … |
Obviously, there is no need the whole individual event Expansion Planning measure in candidate's Expansion Planning measure set CS all to be implemented, because measure of every execution, the removal of load amount of power distribution network will reduce, and the accumulative total removal of load amount that reaches power distribution network is zero.
The electric limit of the main-transformer of each in present embodiment is 2000A, the electric limit of each 10kV bus is 2000A, and feeder line adopts LGJ-150, considers after safety coefficient (γ=0.85), on permissible load, be limited to 380A, the load of each region and feeder line section as shown in Figure 5.Circle in figure represents switch, and solid expression is closed, and hollow expression disconnects, its numbering of the numeral on switch side.Suppose 700,000 yuans of every kilometer of comprehensive costs of high pressure inlet wire; Feeder line dilatation adopts LGJ-240, considers on permissible load, to be limited to 500A after safety coefficient (as γ=0.82), and 80,000 yuans of every kilometer of comprehensive costs, the switch that electrical capacity is 500A and auxiliary device comprehensive cost thereof are 150,000 yuan; Increase interconnection and adopt LGJ-150, every kilometer of comprehensive cost is 60,000 yuans; 100,000 yuans of interconnection switch and auxiliary device comprehensive costs thereof; The comprehensive cost that increases by one group of main-transformer is 4,000,000 yuans; Sectionalized single busbar connection contact cabinet and auxiliary device comprehensive cost thereof are 200,000 yuans; The comprehensive cost that expands into double-bus (5 return back out line) is 1,500,000 yuans, and the comprehensive cost that increases an outlet is 200,000 yuans.The expansion investment allowing is 6,000,000 yuans.The weight of supposing each minimum distribution region fault in this example equates.
Set hidden failure probability P
h=0.0203, hidden failure probability is the probability P of relay protection correct operation
pro=0.9797, according to line fault probability and its seriousness, can obtain value-at-risk, sequence can be determined critical circuits; Use again fuzzy comprehensive evaluation method locator key transformer and transformer station, thereby determine key link.
Key link is combated a natural disaster to sex change analysis, can obtain power distribution network key link to combat a natural disaster sex change analysis indexes table 3 as follows:
Table 3 power distribution network key link combat a natural disaster sex change index table
And then analyze can obtain power distribution network key link combat a natural disaster sex change analysis and the Expansion Planning measure table of comparisons 4 as follows:
Table 4 improvement project table
After redundancy (repetition) individual event Expansion Planning measure in deletion in table, form a candidate's Expansion Planning single measure table 5 as follows:
Table 5 candidate Expansion Planning single measure table
| Numbering | Expansion Planning | Expense | |
| 1 | 113 single busbars make sectionalized single busbar connection into | 20 | |
| 2 | |
400 | |
| 3 | Increase line 57-89 | 16 | |
| 4 | Feeder line 52-53 |
16 | |
| 5 | Increase line 59-90 | 16 | |
| 6 | Feeder line 44-45 |
19 | |
| 7 | Feeder line 7-6 |
19 | |
| 8 | Feeder line 42-41 |
19 | |
| 9 | Feeder line 18-17 |
19 | |
| 10 | Feeder line 29-28 |
19 | |
| 11 | Feeder line 20-21 |
19 | |
| 12 | Feeder line 10-11 |
19 | |
| 13 | |
29 | |
| 14 | |
29 | |
| … | … | … |
Step 3: the power distribution network investment cost of take is minimum is target, meets following constraint condition simultaneously:
Constraint condition 1: the accumulative total removal of load amount that meets power distribution network is zero;
Constraint condition 2: the electric current that flows through power distribution network should meet following constraint condition:
I≤I
i,max
In formula, I represents to flow through the electric current of power distribution network, I
i, maxrepresent that power distribution network branch road i allows upper current limit;
U
min≤U≤U
max
In formula, U represents distribution network voltage, U
minthe minimum voltage value that power distribution network allows, U
maxit is the maximum voltage value that power distribution network allows;
Key link to power distribution network under the condition that meets above-mentioned target and constraint is expanded;
The described key link to power distribution network is expanded, and specifically comprises the following steps:
Step 3.1: use fusion ant colony taboo particle cluster algorithm to carry out the Expansion Planning of power distribution network, its process as shown in Figure 8.
(1) utilize ant group algorithm to determine the set of power distribution network expansionary measures: first according to each independent expansionary measures, calculate the input-output ratio of every kind of expansionary measures, input-output ratio is Δ L '
k ∑c
i, Δ L ' wherein
k ∑that the removal of load of carrying out after i individual event expansionary measures is fallen, input-output ratio is sorted, the Expansion Planning measure of rear 20% in collating sequence is put into taboo list, in remaining expansionary measures, select, select the corresponding expansionary measures of input-output ratio maximal value to expand power distribution network, now, the removal of load amount of power distribution network reduces, and produces new distribution network; Again in remaining single measure, according to the larger principle of the larger transition probability of input-output ratio, select, the expansionary measures that use is chosen is expanded again to power distribution network, now, the removal of load amount of power distribution network further reduces, and produces another new distribution network, repeats this process, until the removal of load amount of power distribution network is zero, obtain the set of a plurality of power distribution network expansionary measures;
(2) utilize particle cluster algorithm to determine the optimum expansionary measures of power distribution network: the input by the power distribution network expansionary measures set producing in (1) as particle cluster algorithm, utilize particle cluster algorithm, export optimum expansionary measures;
Idiographic flow is as follows:
The 1st step: each parameter of initialization.Tabu table is for empty, and ant group's iterations is NC, and the iterations of particle cluster algorithm is NP, pheromones maximal value τ
max, pheromones minimum value τ
min, inertial factor w, accelerator coefficient c
1and c
2, particle maximum flying speed v
max, k=0.
The 2nd step: for each measure in CS, each node measure has input-output ratio and removal of load to fall two attributes, the input-output ratio Δ L ' of calculating i single measure
k ∑c
i, Δ L ' wherein
k ∑that the removal of load of carrying out after i individual event expansionary measures is fallen, C
ifor taking the expense of i individual event expansionary measures.If Δ L '
k ∑c
ithe larger time pheromones density in measure path of leading to of value just larger, Tabu table is used for the node of advancing of mark and standard ant, and 20% few node measure of pheromones density is put into Tabu table.
The 3rd step a: ant is put into B
i/ C
ion maximum node, start to select the Expansion Planning measure of input-output ratio maximum.
The 4th step: according to the larger principle of the larger transition probability of pheromones density, this ant is constantly set up path by application state transition rule repeatedly; The larger pheromones density of input-output ratio of single measure is just larger.
The 5th step: often all can cause the minimizing of total removal of load amount through a measure node, constraint IF condition Δ L
k Σzero? to carry out next step; Otherwise return to the 3rd step.
The 6th step: iterations end condition meets no? otherwise forwarding the 4th step to, is to carry out next step.
The 7th step: extract all measure paths that also have pheromones to distribute, form different measure set, and each measure set is considered as to particle, carry out particle cluster algorithm initialization; The position that initial search point is set is speed extremely, conventionally produce in allowed limits, the pbest coordinate of each particle is set to current location, and calculates its current individual extreme value, and global extremum is exactly best in individual extreme value, and gbest is set to the current location of best particle.
The 8th step: in each particle, measure collection forms PS
(k), evaluate the fitness value of each each particle of calculating particles, if its performance is better than the current individual extreme value of this particle, pbest is set to the position of this particle, and upgrades individual extreme value.If best in the individual extreme value of all particles, be better than current global extremum, gbest is set to the position of this particle, and upgrades global extremum.
The 9th step: use formula
With
the speed of each particle and position are upgraded.
The 10th step: check meets termination condition?
The 11st step: current iteration has reached predefined maximum times? be to stop iteration output optimum solution, otherwise k=k+1 proceed to the 8th step.
The Expansion Planning measure path particle that present embodiment adopts fusion ant colony taboo particle cluster algorithm to be optimized: as increased 6# main-transformer, 113 sectionalized single busbar connections (increasing busbar sectional izing switch), feeder line 18-17 (500m), 52-53 (500m) dilatation adopts LGJ-240, outlet switch 18, 52 the permissible load upper limit changes 500A into, increase by 4 10kV circuits: feeder line 85-87-88 (1500m) and feeder line 86-89-90 (1500m), increase interconnection 57-89 (1000m) and interconnection 59-90 (1000m), newly-increased 10kV circuit is all selected LGJ-150 wire, increase interconnection switch 57, 59, the sub-load of feeder line 18-19-14 is changed by feeder line 83-85 and powered, the sub-load of feeder line 29-27-49 is changed by feeder line 84-87 and powered.It is 5,480,000 yuan that required comprehensive cost is built in expansion.
Step 4: according to the determined expansionary measures of step 3, power distribution network is expanded, the simplified model of distribution networks figure after expansion is shown in accompanying drawing 9.
Although more than described the specific embodiment of the present invention, the those skilled in the art in this area should be appreciated that these only illustrate, and can make various changes or modifications to these embodiments, and not deviate from principle of the present invention and essence.Scope of the present invention is only limited by appended claims.
Claims (2)
1. based on combating a natural disaster the device of sex change index expansion power distribution network, comprising:
Data acquisition and monitoring module: for gathering voltage analog, current analog amount, switching value and constraint information, and analog input amount is converted to digital quantity;
Communication module: for reception and the transmission in information between data acquisition and monitoring module and data processing module, between data processing module and input/output module, between data processing module and database;
Input/output module: for according to the information of the data processing module receiving, by operating personnel, system monitored and control;
Database module: combat a natural disaster sex change index and candidate's single measure record for generating forecast failure database, node incidence matrix, key link, complete data backup and management;
Data processing module: for power distribution network key link being carried out to identification, generating forecast failure pattern base, combat a natural disaster sex change analyzing and processing;
It is characterized in that:
In described data processing module, also further comprise:
Generate forecast failure pattern base unit: according to historical data, set up the stoppage in transit causing because of maintenance corresponding to fault corresponding to each key link or each key link;
Dynamic analysis network topology unit: actual power distribution network is abstracted into electricity distribution network model and represents, according to the structure of actual power distribution network, mark out transformer node and distribution line in electricity distribution network model;
Combat a natural disaster sex change analysis and processing unit: for each key link fault of power distribution network being combated a natural disaster to sex change analysis, obtain combating a natural disaster sex change index, and generate individual event power distribution network expansionary measures table;
Expanding element: use fusion ant colony taboo particle cluster algorithm to carry out the expansion of power distribution network key link;
Optimum expansion recognition unit: whether the removal of load amount that judges power distribution network is zero; If so, choose optimum expansionary measures set; If no, adjust the threshold values that intelligence is chosen power distribution network key link unit, again choose key link;
Intelligence is chosen key link unit: for threshold value is set, according to the threshold values of setting, identify critical circuits and crucial transformer simultaneously.
2. based on combating a natural disaster the method for sex change index expansion power distribution network, utilize described in claim 1 based on combating a natural disaster the device of sex change index expansion power distribution network, it is characterized in that: comprise the following steps:
Step 1: determine the key link of actual power distribution network, described key link further comprises critical circuits and crucial transformer, and concrete steps are as follows
Step 1.1: actual power distribution network is abstracted into electricity distribution network model and represents, according to the structure of actual power distribution network, mark out transformer node and distribution line in electricity distribution network model;
Step 1.2: the critical circuits that utilizes the method identification practical power systems of improved comprehensive assessment circuit critical index: on the basis of the betweenness of distribution network line, load level coefficient, three indexs of branch road correlation coefficient, further introduce the probability of line failure, the product of comprehensive these four indexs forms critical index, critical index is sorted, and the larger expression of critical index is more crucial;
Step 1.3: utilize fuzzy comprehensive evaluation method to carry out locator key transformer: model fuzzy matrix R represents the contact tightness degree between each transformer node in power distribution network, utilize the fuzzy weight vector A of reaction transformer weighing factor in distribution network, using the synthetic B of fuzzy weight vector A and fuzzy matrix R as the final appraisal results matrix of being passed judgment on object, in this evaluation result matrix, if element value is greater than predefined threshold value, the transformer of this element representation is crucial transformer;
Step 2; The acquisition of combating a natural disaster sex change analysis and single measure complete list of power distribution network key link, concrete steps are as follows:
Step 2.1: all key links in power distribution network are combated a natural disaster to sex change analysis: suppose first respectively in power distribution network certain transformer or certain circuit breaks down or need to overhaul, then respectively the transformer that breaks down or need to overhaul or circuit are combated a natural disaster to sex change analysis, the described sex change analytic process of combating a natural disaster is: isolated fault, load restoration, calculating Distribution Network Frame are combated a natural disaster the network reconfiguration that sex change, load balancing, the removal of load amount minimum of take are target; What utilization combated a natural disaster that sex change obtains all transformers and all distribution lines in whole distribution combats a natural disaster sex change index.
Step 2.2: according to the sex change index of combating a natural disaster of step 2.1, determine the expansionary measures carry out for power distribution network key link, determine each expansionary measures with its relation between corresponding expense;
Step 3: the power distribution network investment cost of take is minimum is target, meets following constraint condition simultaneously:
Constraint condition 1: the accumulative total removal of load amount that meets power distribution network is zero;
Constraint condition 2: the electric current that flows through power distribution network should meet following constraint condition:
I≤I
i,max
In formula, I represents to flow through the electric current of power distribution network, I
i, maxrepresent that power distribution network i branch road allows upper current limit;
Constraint condition 3: voltage should meet following constraint condition:
U
min≤U≤U
max
In formula, U represents distribution network voltage, U
minthe minimum voltage value that power distribution network allows, U
maxit is the maximum voltage value that power distribution network allows;
Key link to power distribution network under the condition that meets above-mentioned target and constraint is expanded;
The described key link to power distribution network is expanded, and specifically comprises the following steps:
Step 3.1: use fusion ant colony taboo particle cluster algorithm to carry out the Expansion Planning of power distribution network;
(1) utilize ant group algorithm to determine the set of power distribution network expansionary measures: the input-output ratio of first calculating every kind of expansionary measures according to each individual event expansionary measures, input-output ratio is sorted, the Expansion Planning measure of rear 20% in collating sequence is put into taboo list, in remaining expansionary measures, select, select the corresponding expansionary measures of input-output ratio maximal value to expand power distribution network, now, the removal of load amount of power distribution network reduces, and produces new distribution network; According to the larger principle of the larger transition probability of input-output ratio, in remaining expansionary measures, select again, the expansionary measures that use is chosen is expanded again to power distribution network, now, the removal of load amount of power distribution network further reduces, and produces another new distribution network, repeats this process, until the removal of load amount of power distribution network is zero, obtain the set of a plurality of power distribution network expansionary measures;
(2) utilize particle cluster algorithm to determine the optimum expansionary measures of power distribution network: the input by the power distribution network expansionary measures collection producing in (1) as particle cluster algorithm, utilize particle cluster algorithm, export optimum expansionary measures;
Step 4: power distribution network is expanded according to the determined expansionary measures of step 3.
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