CN105762921B - A kind of cyclization of based superconductive current limiter turns method of supplying power to - Google Patents
A kind of cyclization of based superconductive current limiter turns method of supplying power to Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
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Abstract
The invention provides a kind of cyclization of based superconductive current limiter to turn method of supplying power to, and step includes：Calculate the current limitation effect normalization evaluation index F of superconductive current limiter1, calculate the cost normalization evaluation index F of superconductive current limiter2, establish the configuration decisions model of closed loop network superconductive current limiter, establish a current limliting genetic operation device, using current limliting genetic operation device run genetic algorithm and export restrain when genetic algebra under parallel resistance resistance, actual use band length l and each installed position switching value.The cyclization turns the configuration decisions model that method of supplying power to establishes closed loop network superconductive current limiter, the principal element for influenceing cyclization design is integrated, it effectively ensure that the reliability and accuracy of cyclization design, carry out automating genetic iteration computing using current limliting genetic operation device, to export optimal programme, cyclization design is possessed universality, improve the automation of power network the whole network.
Description
Technical field
The present invention relates to a kind of cyclization to turn method of supplying power to, and especially a kind of cyclization of based superconductive current limiter turns supplier of electricity
Method.
Background technology
With the fast development of modern power systems, the proposition of intelligent grid concept, the hair transmission ＆ distribution of whole power system become
All start to develop towards the direction of automation with five big links.In terms of distribution, it is contemplated that the factor such as short circuit current, at present China
Domestic medium voltage distribution network is using " closed loop design, open loop operation ", when Distribution system design, between each load area
There is extension wire, and under normal operating conditions, these circuits are not put into operation, and therefore, each load is only supplied by a power supply
Electricity, not into inscription of loop.When 110kV main transformers need periodical power failure to overhaul, all 10k distribution web areas of substation's band
The problem of large-area power-cuts will be faced with, this has severely impacted the reliability and operational flexibility of supplying power allocation, and uses and close
The method that ring turns power supply is to improve power supply reliability, avoid the important measures of large-area power-cuts.So-called cyclization turns powered operation, refers to
Be Liang Ge transformer stations low-pressure side distribution line between have an extension wire, the circuit does not put into power network under normal operating condition
In, can and when some transformer station needs interruption maintenance, or when one section of distribution line of substation's band needs interruption maintenance
First to close the interconnection switch of extension wire, then disconnect the circuit for needing to overhaul.By putting into various zones 10kV medium-voltage distributions
Radial power distribution network, can be temporarily changed ring network power supply by the interconnector between net, and after Electromagnetic coupling, separate unit main transformer exits
Grid power blackout maintenance will not result in institute's on-load and lose power supply, but this sub-load has been transferred under other transformer stations.
Obviously, powered operation is turned by cyclization, large-area power-cuts can be avoided, greatly improve the reliability of power distribution network power supply.
But cyclization turns many risks being still had during powered operation.Although the both sides that extension wire is connected all are
10kV feeder lines, but because both sides network parameter is asymmetric, the difference on voltage magnitude and phase angle is often produced, so as to be formed
Voltage difference.And the impedance of extension wire in itself is very small, when directly closing in interconnection switch access power network, it is possible to because two
The voltage difference of side and produce dash current.If Loop Closing Operation is arbitrarily carried out in the case of no counter-measure, it is likely that meeting
Larger dash current is produced, the stability of whole load area distribution network operation is had influence on, is possibly even led when serious
Cause the consequences such as protective relaying device malfunction, circuit overload, electrical equipment damage.
For this problem, in actual moving process, most power supply department use is first out of service by load, so
Afterwards in the method for transfer load.The 110kV plant stands for treating interruption maintenance are first exited into power network, at this moment substation's on-load is all
In power down mode, then main transformer and distribution line are disconnected again, finally put into extension wire again, transfers a load onto it
Under his main transformer.The problem of being not in thus dash current, but institute's on-load has of short duration power failure process, can not ensure
The continuous-stable of power supply, it still can influence the production and living of user side.Another method is to pass through experienced dispatcher's
Operation, such as changes the method for operation of power network, cutting load falls load operation, change load tap changer, switched capacitor group, makes
Cyclization point both sides voltage amplitude and phase angle close to consistent, i.e., the reduction cyclization of maximum possible when extension wire both sides voltage
Difference, Alloy White Iron can be thus limited in the range of an acceptable.But not a set of perfect scheme or
The situation of excessive dash current when operating article to avoid cyclization, relatively more research is just for specific distribution net work structure
Analyzed, and the structure of power distribution network is very complicated and changeable, therefore these are studied the conclusion drawn and are not had universality.
Because Loop Closing Operation relies on dispatcher's field assay, belong to micro-judgment type, therefore the larger risk still having, and this
Also the requirement of power network the whole network automation can not be catered to.
The content of the invention
The technical problem to be solved in the present invention is that existing cyclization design judges also by construction experience, existing larger
Risk, and this can not also cater to power network the whole network automation requirement.
In order to solve the above-mentioned technical problem, the invention provides a kind of cyclization of based superconductive current limiter to turn method of supplying power to,
Comprise the following steps：
Step 1, the current limitation effect for turning the dash current calculating superconductive current limiter of actual acquisition in power supply road according to cyclization is returned
One changes evaluation index F1For：
In formula, I1For circuit constraint electric current, the maximum load current in cyclization point circuit, i are chosenMFor the impact electricity of reality
Stream；
Step 2, the cost using length computation superconductive current limiter for turning superconducting tape in power supply road according to cyclization normalizes
Evaluation index F2For：
In formula, lmaxFor the band maximum length set according to concrete condition, l is that cyclization turns superconducting tape in power supply road
Actually use band length；
Step 3, evaluation index F is normalized according to current limitation effect1With cost normalization evaluation index F2Establish closed loop network
The configuration decisions model of superconductive current limiter is：
F=ω F1+(1-ω)F2
In formula, F1Span be [0,1], F2Span be also [0,1], ω is the weight factor of model, value
Scope is also [0,1]；
Step 4, it is assumed that turn superconduction of the installation with digital output modul between site under each load on power supply road in cyclization
Current limiter, a current limliting genetic operation device is established, the product of band length l and switching value, superconductive current limiter will be actually used
The resistance of parallel resistance and the dash current i of realityMRespectively as three input quantities of current limliting genetic operation device, configuration is determined
Fitness function of the plan model as current limliting genetic operation device, using the fitness function value of calculating as current limliting genetic operation device
Output quantity；
Step 5, genetic algorithm is run using current limliting genetic operation device, when the fitness function value of output restrains stable,
Export the resistance of the parallel resistance under current genetic algebra, actually use the switch of band length l and each installed position
Amount, switching value are 1 or 0, represent whether the hypothesis opening position installs superconductive current limiter respectively.
Using current limitation effect normalization evaluation index F1With cost normalization evaluation index F2To establish closed loop network superconduction
The configuration decisions model of current limiter, by influence cyclization design principal element integrated, effectively ensure that cyclization design can
By property and accuracy；Genetic algorithm is run using current limliting genetic operation device, by the resistance of parallel resistance, actual use band length
L and reality dash current iMInput quantity as current limliting genetic operation device carries out automating genetic iteration computing, with output
Optimal programme, cyclization design is possessed universality, improve the automation of power network the whole network；Being capable of root using weight factor ω
Need to be chosen according to the practice of construction of power network, further enhancing the universality of cyclization design.
As the further limits scheme of the present invention, in step 5, current limliting genetic operation device runs the specific step of genetic algorithm
Suddenly it is：
Step 5.1, initialize, individual amount and maximum genetic algebra in population are set, given birth to by current limliting genetic operation device
Into initial population, each individual represents a kind of programme of superconductive current limiter in population, i.e., each individual includes one group
The input quantity of current limliting genetic operation device；
Step 5.2, individual evaluation, according to the configuration decisions model established in step 3 to corresponding to each individual in population
Programme calculates a fitness function value, and fitness function value is bigger to represent that programme corresponding to this individual is more excellent
Show, also it is better able to the existence in genetic evolution；
Step 5.3, hereditary variation, population by select, intersect and mutation operator complete hereditary variation process, complete
Once judge whether to reach maximum genetic algebra after heredity, if reaching maximum genetic algebra, into step 5.4, otherwise return
Step 5.2 continues hereditary variation；
Step 5.4, terminate calculate, through excessively for hereditary variation after, individual cognition in population gradually restrain stably, fitness
Functional value reaches peak, referred to as optimal solution.
Preferred process can be carried out to the programme of each grey iterative generation using genetic algorithm, until fitness function value
It is stable to tend to convergence, optimal programme is finally obtained, so that it is guaranteed that the superiority of the cyclization planning and designing in power network.
As the further limits scheme of the present invention, in step 1, actual dash current iMTo be stored in current matrix
Maximum current value, current matrix be used for store collection actual current value.Reading can be facilitated to filter out using current matrix
Maximum current value.
The beneficial effects of the present invention are：(1) using current limitation effect normalization evaluation index F1Normalize and evaluate with cost
Index F2To establish the configuration decisions model of closed loop network superconductive current limiter, the principal element for influenceing cyclization design is carried out comprehensive
Close, effectively ensure that the reliability and accuracy of cyclization design；(2), will simultaneously using current limliting genetic operation device operation genetic algorithm
Join resistance, actual use band length l and the actual dash current i of resistanceMInput quantity as current limliting genetic operation device
Carry out automating genetic iteration computing, to export optimal programme, cyclization design is possessed universality, it is complete to improve power network
Automation；(3) it can be needed to be chosen according to the practice of construction of power network using weight factor ω, further enhancing cyclization
The universality of design.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is the current limliting genetic operation device input/output structure schematic diagram of the present invention；
Fig. 3 is the electric network composition schematic diagram of the first embodiment of the present invention；
Fig. 4 is model structure of the first embodiment of the present invention in Simulink；
Fig. 5 is the optimal solution curve of pursuit of the first embodiment of the present invention；
Fig. 6 is the superconductive current limiter configuration scheme schematic diagram of the first embodiment of the present invention；
Fig. 7 is the electric network composition schematic diagram of the second embodiment of the present invention；
Fig. 8 is model structure of the second embodiment of the present invention in Simulink；
Fig. 9 is the optimal solution curve of pursuit of A cyclizations point in the second embodiment of the present invention；
Figure 10 is the optimal solution curve of pursuit of B cyclizations point in the second embodiment of the present invention；
Figure 11 is the optimal solution curve of pursuit of C cyclizations point in the second embodiment of the present invention；
Figure 12 is three kinds of cyclization mode optimal solution tracking diagrams in the second embodiment of the present invention；
Figure 13 is the superconductive current limiter configuration scheme schematic diagram of the second embodiment of the present invention；.
Embodiment
As illustrated in fig. 1 and 2, the cyclization of based superconductive current limiter of the invention turns method of supplying power to, comprises the following steps：
Step 1, the current limitation effect for turning the dash current calculating superconductive current limiter of actual acquisition in power supply road according to cyclization is returned
One changes evaluation index F1For：
In formula, I1For circuit constraint electric current, the maximum load current in cyclization point circuit, i are chosenMFor the impact electricity of reality
Stream, actual dash current iMTo be stored in the maximum current value in current matrix, current matrix is used for the reality for storing collection
Current value；
Step 2, the cost using length computation superconductive current limiter for turning superconducting tape in power supply road according to cyclization normalizes
Evaluation index F2For：
In formula, lmaxFor the band maximum length set according to concrete condition, l is that cyclization turns superconducting tape in power supply road
Actually use band length；
Step 3, evaluation index F is normalized according to current limitation effect1With cost normalization evaluation index F2Establish closed loop network
The configuration decisions model of superconductive current limiter is：
F=ω F1+(1-ω)F2
In formula, F1Span be [0,1], F2Span be also [0,1], ω is the weight factor of model, value
Scope is also [0,1]；
Step 4, it is assumed that turn superconduction of the installation with digital output modul between site under each load on power supply road in cyclization
Current limiter, a current limliting genetic operation device is established, the product of band length l and switching value, superconductive current limiter will be actually used
The resistance of parallel resistance and the dash current i of realityMRespectively as three input quantities of current limliting genetic operation device, configuration is determined
Fitness function of the plan model as current limliting genetic operation device, using the fitness function value of calculating as current limliting genetic operation device
Output quantity；
Step 5, genetic algorithm is run using current limliting genetic operation device, when the fitness function value of output restrains stable,
Export the resistance of the parallel resistance under current genetic algebra, actually use the switch of band length l and each installed position
Amount, switching value are 1 or 0, represent whether the hypothesis opening position installs superconductive current limiter respectively, wherein, current limliting genetic operation device fortune
Row genetic algorithm concretely comprises the following steps：
Step 5.1, initialize, individual amount and maximum genetic algebra in population are set, given birth to by current limliting genetic operation device
Into initial population, each individual represents a kind of programme of superconductive current limiter in population, i.e., each individual includes one group
The input quantity of current limliting genetic operation device；
Step 5.2, individual evaluation, according to the configuration decisions model established in step 3 to corresponding to each individual in population
Programme calculates a fitness function value, and fitness function value is bigger to represent that programme corresponding to this individual is more excellent
Show, also it is better able to the existence in genetic evolution；
Step 5.3, hereditary variation, population by select, intersect and mutation operator complete hereditary variation process, complete
Once judge whether to reach maximum genetic algebra after heredity, if reaching maximum genetic algebra, into step 5.4, otherwise return
Step 5.2 continues hereditary variation, wherein, the individual that selection opertor causes fitness high is easily left, and fitness is low
Individual then be easily eliminated, crossover operator randomly chooses two selected individuals and intersects gene section from a point, this operation
Can be with the diversity of redundant gene type, i.e. programme, mutation operator causes the genotype of individual has to be changed compared with small probability,
Its effect lies also in redundant gene type so that all programmes may all occur in population in theory；
Step 5.4, terminate calculate, through excessively for hereditary variation after, individual cognition in population gradually restrain stably, fitness
Functional value reaches peak, referred to as optimal solution.
Embodiment 1：
As shown in figure 3, it is directed to different 110kV plant stands low-pressure side 10kV feeder line cyclization examples.
First, set up and build electric network composition circuit as shown in Figure 3,110kV the main transformers T1's and T2 of two various zones
Original and be not connected between low-pressure side 10kV feeder lines, when cyclization point closes, two sections will be into inscription of loop.Between 10kV feeder lines
There is many places load off line, therefore, in whole network be provided with superconductive current limiter at A, B, C, D, E five and plan place.
The model built under Simulink is as shown in figure 4, two sections top is 220kV buses, by 220kV/
110kV transformers, 110kV circuits, 110kV/10kV transformers enter 10kV medium voltage distribution networks, the 10kV feeder lines in two regions it
Between be divided into multistage, have load off line.ABCDE is restrictor configuration place in figure, accesses the superconducting current-limiting based on Simulink
Device model.Cyclization point is perfect switch, controls closed loop time by step signal, produces transient process.
The model of current limliting genetic operation device is respectively as shown in Fig. 2 the parameter of superconductive current limiter has three：Band length
L, parallel resistance R and switching value k.Input signal is to flow through the current value of the current limiter, i.e. actual dash current iM.It is in parallel
Resistance is inputted by In6 mouths, and sample rate current is inputted by In2 mouths, and band length and switching value input after doing product from In5 mouths.If
Switching value is 1, represents that the current limiter comes into operation, and the result of product is exactly band length, if switching value is 0, represents the limit
Stream device does not come into operation, and band length is equivalent to 0 after product.By such input control signal, can be easy to heredity
In algorithm, the parameter of each individual inputs to model by corresponding ports, and carries out simulation calculation.
The output quantity of current limliting genetic operation device is arranged to fitness function value, is exported by conn2 mouths, the sampled value of electric current
It is automatically saved in the current matrix in workspace.With reference to the decision model allocation models function of current limiter, obtaining current matrix
In maximum of the maximum as dash current, and cost is then together decided on by band length and switching value, and by electric current and
Cost collectively forms fitness function, carries out genetic algorithm with this, solves the optimal solution of current limiter optimization planning.
It is related to five restrictor configuration points in this planning process, therefore is related to 15 parameters, per each and every one in genetic algorithm
Body is all the ordered sequence string for including this 15 numerical value, and this 15 numerical value represent five restrictor configuration points of A, B, C, D, E respectively
The band length of the current limiter at place, parallel resistance resistance and switching value.Numerical value is different, can according to content corresponding to the numerical value of place
To calculate the cost of programme corresponding to this individual, electric current and fitness function value.
Secondly, result of calculation, because superconductive current limiter model nonlinear degree is very big, in the presence of multiple current limiters are common
Simulation velocity is very slow, therefore the number of individuals that this genetic algorithm is selected is 15, genetic algebra 40.From result, 40
In generation, restrains substantially.Shown in specific tables of data 1 and Fig. 5.
Table 1 is the result of calculation of first embodiment
Table 1 has tracked genetic algorithm and has crossed the 40 generation Xie Chengzhong asked, per a generation 15 individuals in maximum fitness function value,
Least cost and minimum Alloy White Iron.Fitness function value is that cost and Alloy White Iron pass through at a linear normalization in fact
Weighted value after reason.So the target distributed rationally is the maximization of fitness function value, the cost of possible optimal solution and it is not
Minimum, current limitation effect is nor best, but weighted value is maximum.It can be seen that to come from optimal solution curve of pursuit, from
0.4 or so at the beginning is slowly lifted, and 0.71 is reached in or so the 22nd generation and is stablized nearby, its convergence situation is very not
Wrong.The optimal solution finally drawn is as shown in table 2.
Table 2 is the individual data items in last generation
| l1 | l2 | l3 | l4 | l5 | R1 | R2 | R3 | R4 | R5 | k1 | k2 | k3 | k4 | k5 | |
| 1 | 122.0 | 35.2 | 19.6 | 17.3 | 36.1 | 1.1 | 4.9 | 5.0 | 4.2 | 2.7 | 1.0 | 0.0 | 1.0 | 1.0 | 0.0 |
| 2 | 77.6 | 37.2 | 19.6 | 4.7 | 28.2 | 1.1 | 4.5 | 4.8 | 1.7 | 1.1 | 1.0 | 1.0 | 1.0 | 1.0 | 0.0 |
| 3 | 122.0 | 25.9 | 18.4 | 7.1 | 34.5 | 1.0 | 4.5 | 3.9 | 2.8 | 1.1 | 1.0 | 0.0 | 0.0 | 1.0 | 1.0 |
| 4 | 122.0 | 38.4 | 19.5 | 17.3 | 34.5 | 1.1 | 5.0 | 5.0 | 4.2 | 3.6 | 1.0 | 1.0 | 1.0 | 1.0 | 0.0 |
| 5 | 122.3 | 38.4 | 15.5 | 4.7 | 28.2 | 1.2 | 4.9 | 5.0 | 4.2 | 2.7 | 1.0 | 1.0 | 1.0 | 0.0 | 0.0 |
| 6 | 123.0 | 35.9 | 19.6 | 5.5 | 13.3 | 1.2 | 0.5 | 4.8 | 2.8 | 1.1 | 1.0 | 1.0 | 1.0 | 0.0 | 0.0 |
| 7 | 123.2 | 35.9 | 18.8 | 17.3 | 34.5 | 1.1 | 5.0 | 5.0 | 4.2 | 3.6 | 1.0 | 1.0 | 1.0 | 0.0 | 0.0 |
| 8 | 122.3 | 38.4 | 19.3 | 5.5 | 28.2 | 1.2 | 4.5 | 4.8 | 1.7 | 1.1 | 1.0 | 1.0 | 1.0 | 0.0 | 0.0 |
| 9 | 122.0 | 35.9 | 19.6 | 17.3 | 165.5 | 1.1 | 4.5 | 5.0 | 4.2 | 3.6 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 |
| 10 | 120.6 | 37.6 | 18.2 | 6.3 | 17.3 | 1.0 | 5.0 | 5.0 | 4.2 | 3.6 | 1.0 | 1.0 | 1.0 | 0.0 | 0.0 |
| 11 | 121.4 | 37.6 | 21.2 | 6.3 | 17.3 | 1.0 | 4.4 | 3.7 | 2.8 | 1.5 | 1.0 | 1.0 | 1.0 | 0.0 | 0.0 |
| 12 | 120.1 | 37.6 | 20.6 | 6.3 | 17.3 | 1.2 | 5.0 | 4.9 | 4.2 | 3.6 | 1.0 | 1.0 | 1.0 | 0.0 | 0.0 |
| 13 | 122.3 | 35.9 | 19.3 | 17.3 | 36.9 | 1.7 | 4.5 | 4.8 | 1.7 | 1.1 | 1.0 | 1.0 | 1.0 | 0.0 | 0.0 |
| 14 | 121.4 | 35.4 | 19.1 | 17.3 | 36.9 | 1.3 | 4.5 | 4.8 | 1.7 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 0.0 |
| 15 | 122.9 | 38.4 | 18.5 | 4.7 | 171.8 | 1.2 | 4.9 | 5.0 | 0.8 | 2.7 | 1.0 | 1.0 | 1.0 | 0.0 | 0.0 |
The content of table 2 is 15 individual parameter situations in the 40th generation.Here it is middle B, C, D limit corresponding to 1,2,3
Device collocation point is flowed, 4,5 represent A, E restrictor configuration point, such as l respectively1What is represented is the band length that collocation point B corresponds to current limiter
Degree.It can be evident that the parameter of three current limiters near cyclization point has restrained from table, l1、l2、l3Receive respectively
Hold back in 122,37 and 20 or so, R1、R2、R31.2,4.9 and 4.8 are converged on respectively, and switching value is also 1.And to two later
The current limiter of clutch circling point farther out, due to its current limitation effect be not it is obvious that and cost occupies leading position, therefore, open
Measure k in pass4、k50 is converged to, corresponding band length and parallel resistance, because having no effect on target in the case where not putting into operation
Functional value, so there is not convergent situation.
Finally, conclusion is obtained, can be concluded that by the result of genetic algorithm：Needed at B, C, D of cyclization point
Install superconductive current limiter additional, its parameter is l respectively1=122m, R1=1.2 Ω, l2=37m, R2=4.9 Ω, l3=20m, R3=
4.8 Ω, clutch circling point farther out two at A, E do not install superconductive current limiter additional.Under the program, totle drilling cost is 811170 yuan, after current limliting
Maximum current be 570A, the configuration diagram of superconductive current limiter is as shown in Figure 6.
Embodiment 2：
More cyclization point complexity 10kV closed loop network examples：
First, circuit is built, first embodiment provides the result of distributing rationally of simple 10kV feeder lines cyclization, but real
The electric network composition on border may not be the structure that simple unit feeder is segmented more.Therefore example two will combine actual medium voltage distribution network
Structure optimizes configuration.Because the topological structure and parameter of network provide in the form of data, therefore first by its turn
Wei not graphical equivalent network.
Rough schematic view and artificial circuit based on Simulink are respectively as shown in Figure 7 and Figure 8.All loads are omitted,
Reservation 10kV buses, feeder line, bus, the structure after cyclization point switchs are as shown in Figure 7.In the medium voltage distribution network, altogether
There are three 10kV buses 140,141 and 15096, and draw 4 feeder lines, two of which feeder line comes from same 10kV buses 140.Four
Bar feeder line respectively power alone by burst, and is connected between any two by switching extension wire, totally three cyclization points, and often
A superconductive current limiter collocation point is respectively provided with one cyclization branch road, is also three allocation positions altogether.
The distribution network model is erected under Simulink, while accesses load, as a result as shown in Figure 8.Three cyclizations
Point is A, B, C respectively, identical with example one, passes through step signal control and closes a floodgate, simulates transient process.It is corresponding with cyclization point
, superconductive current limiter is set respectively at D, E, F.The input quantity of its control signal seldom repeats herein with embodiment 1.
Secondly, result of calculation, due to there is three cyclization points, therefore current embodiment require that solved three times, i.e., it is corresponding often
The cyclization of individual cyclization point, will carry out a simulation calculation, and according to optimal solution respectively, choose optimal cyclization mode and
The allocation plan of superconductive current limiter.It is very big plus superconductive current limiter nonlinear degree because the model emulation of cyclization is slower, because
This, the number of individuals that this genetic algorithm uses is 30, genetic algebra 20.In the loop closing examination of each cyclization point, add super
Before leading current limiter, direct cyclization is first carried out, cyclization dash current is reached 1000A by adjusting parameter.When addition current limiter
Afterwards, the maximum impact electric current after current limliting is compareed with 1000A.
The processing of data is identical with embodiment, only provides optimal solution aircraft pursuit course under each cyclization mode, most herein
Excellent solution and optimal objective function value.During cyclization point A cyclizations, optimal solution aircraft pursuit course is as shown in Figure 9.Fitness function is maximum
It is worth for 0.7192, now maximum Alloy White Iron is 673A, and cost is the cost summation of two current limiters, totally 560650 yuan.It is corresponding
Optimal solution is as shown in table 3.
Table 3 is A point cyclization restrictor configuration optimal solutions
| D current limiters | E current limiters | F current limiters | |
| Switching value | 1 | 1 | 0 |
| Parallel resistance (Ω) | 2.2 | 1.7 | — |
| Band length (m) | 140.2 | 35.3 | — |
During cyclization point B cyclizations, optimal solution aircraft pursuit course is as shown in Figure 10.Fitness function maximum is 0.6928, now
Maximum Alloy White Iron is 742A, and cost is the cost summation of two current limiters, and totally 564500 yuan of corresponding optimal solutions are as shown in table 4.
The B point cyclization restrictor configuration optimal solutions of table 4
| D current limiters | E current limiters | F current limiters | |
| Switching value | 1 | 1 | 0 |
| Parallel resistance (Ω) | 1.4 | 2.5 | — |
| Band length (m) | 52.8 | 135.7 | — |
During cyclization point C cyclizations, optimal solution aircraft pursuit course is as shown in figure 11.Fitness function maximum is 0.5183, now
Alloy White Iron is 752A, and cost is three current limiter cost summations, and totally 835560 yuan of corresponding optimal solutions are as shown in table 5.
The A point cyclization restrictor configuration optimal solutions of table 5
| D current limiters | E current limiters | F current limiters | |
| Switching value | 1 | 1 | 1 |
| Parallel resistance (Ω) | 1.0 | 1.2 | 3.3 |
| Band length (m) | 28.7 | 42.3 | 174.2 |
The optimal solution curve of pursuit of cyclization position at three is contrasted, as shown in figure 12.
Finally, obtain conclusion, due to this algorithm use object function be more big more excellent type, it is clear that A point cyclizations it is optimal
Target function value corresponding to solution is more than B and C two schemes, therefore, in the cyclization location problem and superconducting current-limiting of the power distribution network
In the addressing constant volume problem of device, it should choose A points as optimal cyclization place, current limliting ratio is 32.7%, while superconductive current limiter
The configuration of parameter installs current limiter D, E positioned at cyclization point A, B branch road additional, does not install the current limliting positioned at C branch roads additional as shown in upper table 3
Device F, current limiter D parameter configuration are 140.2 meters of band lengths, and parallel resistance 2.2 Ω, current limiter E parameter configuration are bands
35.3 meters of length, the Ω of parallel resistance 1.7.It is as shown in figure 13 that it distributes figure rationally.
Claims (3)
1. a kind of cyclization of based superconductive current limiter turns method of supplying power to, it is characterised in that comprises the following steps：
Step 1, the current limitation effect for turning the dash current calculating superconductive current limiter of actual acquisition in power supply road according to cyclization normalizes
Evaluation index F1For：
<mrow>
<msub>
<mi>F</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>I</mi>
<mn>1</mn>
</msub>
<mo>-</mo>
<msub>
<mi>i</mi>
<mi>M</mi>
</msub>
</mrow>
<msub>
<mi>I</mi>
<mn>1</mn>
</msub>
</mfrac>
</mrow>
In formula, I1For circuit constraint electric current, the maximum load current in cyclization point circuit, i are chosenMFor the dash current of reality；
Step 2, the cost using length computation superconductive current limiter for turning superconducting tape in power supply road according to cyclization normalizes evaluation
Index F2For：
<mrow>
<msub>
<mi>F</mi>
<mn>2</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>l</mi>
<mrow>
<mi>m</mi>
<mi>a</mi>
<mi>x</mi>
</mrow>
</msub>
<mo>-</mo>
<mi>l</mi>
</mrow>
<msub>
<mi>l</mi>
<mrow>
<mi>m</mi>
<mi>a</mi>
<mi>x</mi>
</mrow>
</msub>
</mfrac>
</mrow>
In formula, lmaxFor the band maximum length set according to concrete condition, l is the reality that cyclization turns superconducting tape in power supply road
Use band length；
Step 3, evaluation index F is normalized according to current limitation effect1With cost normalization evaluation index F2Establish closed loop network superconduction
The configuration decisions model of current limiter is：
F=ω F1+(1-ω)F2
In formula, F1Span be [0,1], F2Span be also [0,1], ω is the weight factor of model, span
Also it is [0,1]；
Step 4, it is assumed that turn to install the superconducting current-limiting with digital output modul under each load on power supply road between site in cyclization
Device, establish a current limliting genetic operation device, by actually use the product of band length l and switching value, superconductive current limiter it is in parallel
The resistance of resistance and the dash current i of realityMRespectively as three input quantities of current limliting genetic operation device, by configuration decisions mould
Fitness function of the type as current limliting genetic operation device, the output using the fitness function value of calculating as current limliting genetic operation device
Amount；
Step 5, genetic algorithm is run using current limliting genetic operation device, when the fitness function value of output restrains stable, export
The resistance of parallel resistance under current genetic algebra, the switching value for actually using band length l and each installed position, are opened
Pass amount is 1 or 0, represents whether the hypothesis opening position installs superconductive current limiter respectively.
2. the cyclization of based superconductive current limiter according to claim 1 turns method of supplying power to, it is characterised in that in step 5, limit
Stream genetic operation device operation genetic algorithm concretely comprises the following steps：
Step 5.1, initialize, individual amount and maximum genetic algebra in population are set, generated just by current limliting genetic operation device
Beginning population, each individual represents a kind of programme of superconductive current limiter in population, i.e., each individual includes one group of current limliting
The input quantity of genetic operation device；
Step 5.2, individual evaluation, according to the configuration decisions model established in step 3 to planning corresponding to each individual in population
Scheme calculates a fitness function value, and fitness function value is bigger to represent that programme corresponding to this individual is more outstanding,
Also it is better able to the existence in genetic evolution；
Step 5.3, hereditary variation, population by select, intersect and mutation operator complete hereditary variation process, complete once
Judge whether to reach maximum genetic algebra after heredity, if reaching maximum genetic algebra, into step 5.4, otherwise return to step
5.2 continue hereditary variation；
Step 5.4, terminate calculate, through excessively for hereditary variation after, individual cognition in population gradually restrain stably, fitness function
Value reaches peak, referred to as optimal solution.
3. the cyclization of based superconductive current limiter according to claim 1 turns method of supplying power to, it is characterised in that real in step 1
The dash current i on borderMTo be stored in the maximum current value in current matrix, current matrix is used for the actual current for storing collection
Value.
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