CN107221926A - A kind of feeder line accessing user's capacity calculation methods based on TSC - Google Patents
A kind of feeder line accessing user's capacity calculation methods based on TSC Download PDFInfo
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- CN107221926A CN107221926A CN201710369666.8A CN201710369666A CN107221926A CN 107221926 A CN107221926 A CN 107221926A CN 201710369666 A CN201710369666 A CN 201710369666A CN 107221926 A CN107221926 A CN 107221926A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
The present invention is intended to provide a kind of feeder line accessing user's capacity calculation methods based on TSC, with solve in prior art the problem of can only relying on micro-judgment feeder line accessing user's capacity.Comprise the following steps, obtain the conversion factor between the load and secondary side distribution transformer capacity on each feeder line of existing load, primary side of each feeder line；Calculated according to TSC models and obtain TSC value；The theoretical load for obtaining each feeder line is calculated according to feeder line model；According to the accessible load on theoretical load and each feeder line of existing carry calculation；Judge whether the accessible load on each feeder line is non-negative, if it is judged that being yes, then regard the accessible load on feeder line as the accessible capacity for corresponding to feeder line；According to the accessible capacity and corresponding conversion factor of each feeder line, accessing user's distribution transformer capacity of distribution feeder is obtained.Feeder line accessing user's distribution transformer capacity can be calculated by this method.
Description
Technical field
The present invention relates to power system, and in particular to a kind of feeder line accessing user's capacity calculation methods based on TSC.
Background technology
China's economic development is rapid, and power consumption is also rising year by year, and it is negative to meet that power distribution network frequently needs access new load
It is not enough and on the premise of meeting N-1 safety in power distribution network power supply point the need for lotus changes, according to the maximum power supply energy of power distribution network
Power (Total Supply Capability, TSC), it is very important to excavate the power supply potential of power distribution network.
The feeder line that power distribution network is confessed by transformer station is broken generally into some sections, realizes and hands in hand with other feeder lines in feeder terminal
Contact.The power supply potential for excavating power distribution network is exactly to analyze power distribution network transformer station interval, feeder line, feeder line segmentation links most
Big power supply capacity, and then compared with existing payload and obtain can access capacity.So, accessible capacity is to consider equipment volume
In the case of constant volume, the capacity that each feeder line and main transformer can also be accessed when meeting N-1 criterions.Expand work in the industry of actual power distribution network
In work, all new load can be accessed at any time, it is necessary to judge whether with enough residual capacities to support connecing for new load in advance
Enter.But actual conditions be in effective measuring and calculating means not to power distribution network active volumes at different levels at present, planning technology principle only
It is related in the recommendation of distribution transformer attaching maximum size, therefore practice all be to rely on artificial micro-judgment, may leads
Cause the feeder line having access to overload, certain potential safety hazard is caused to operation of power networks；It is very few that some feeder lines then access load, precious
Expensive power network resources are not fully utilized.
TSC is increasingly becoming an important indicator for evaluating power distribution network, and its implication refers to work as all feeder line N-1 schools of power distribution network
Test with transforming plant main transformer N-1 verification be satisfied by when, the power distribution network institute energy band maximum total load., it is necessary to consider master when N-1 is verified
Load between change between feeder line turns communication relationship, the capacity of main transformer and feeder line, the main transformer mistake in band, network between main transformer and feeder line
Carry the actual motion constraint of the power distribution networks such as coefficient.Paper《Power distribution network net capability model based on feeder interconnection relationship》,
Publication source is《Automation of Electric Systems》,2011,35(24):47-52；Main transformer interconnection and feeder line interconnection are taken into full account, is established
Strict calculating TSC linear programming model, and optimal solution can be tried to achieve, also become nowadays real closest to power distribution network
The TSC method for solving of border situation.
In addition to power distribution network totality TSC, TSC models and calculating can also provide each main transformer when reaching TSC, the load point on feeder line
Cloth situation, by further assumed load equalization target function, can also obtain under TSC most power load distributing in a balanced way.
The accessible capacity measurement of science progress power distribution network is industry expansion work in the urgent need to formulating next step power network rule
Draw, electric network reconstruction plan is also first hand valuable data.This practical problem of TSC theoretical researches is applied herein, and is proposed
A kind of new feeder line accessing user's capacity calculation methods.
The content of the invention
The present invention is intended to provide a kind of feeder line accessing user's capacity calculation methods based on TSC, to solve prior art side
In case can only rely on micro-judgment feeder line accessing user's capacity the problem of.
In order to realize the purpose, a kind of feeder line accessing user's capacity calculation methods based on TSC of the present invention, including it is as follows
Step,
Step 1：Obtain the load and secondary side distribution transformer capacity on each feeder line of existing load, primary side of each feeder line
Between conversion factor；
Step 2：Calculated according to TSC models and obtain TSC value；
Step 3：The theoretical load for obtaining each feeder line is calculated according to feeder line model；According to theoretical load and existing carry calculation
Accessible load on each feeder line；
Feeder line model is most as object function as the feeder line number of nonnegative value can access load, with the condition of TSC models
Function combination power distribution network institute on-load is that maximum power supply value is used as conditional function；
Wherein, the accessible load on feeder line is the theoretical load of feeder line and the difference of corresponding existing load；
Step 4：Judge whether the accessible load on each feeder line is non-negative, if it is judged that being yes, then by feeder line
On accessible load be used as correspondence feeder line accessible capacity；
Step 5：According to the accessible capacity and corresponding conversion factor of each feeder line, the access for obtaining distribution feeder is used
Family distribution transformer capacity.
It is preferred that, the TSC models in step 2 are：
TSC is maximum power supply value, FiFor main transformer i institutes on-load,FmFor feeder line m load；trfmnFor feeder line
Turn to bring feeder line n load during m generation N-1 failures；trtijTurn to bring main transformer j load during for main transformer i generation N-1 failures
Amount；Fm∈TiRepresent that feeder line m comes from main transformer i corresponding bus；Fn∈TjRepresent that feeder line n comes from main transformer j corresponding bus；RFnFor
Feeder line n rated capacity；FnFor feeder line n load；RjFor main transformer j rated capacity；LDFor the lower limit of some heavily loaded area's load；Z
For all main transformer set in heavily loaded area.
It is preferred that, when whether the accessible load for judging on each feeder line is non-negative, if it is judged that being no, then adjust
The position of the position of block switch or interconnection switch, adjustment block switch or interconnection switch, according to block switch or interconnection switch
Adjustment update feeder line on accessible load, judge renewal after accessible load whether be non-negative, if it is judged that
It is yes, regard the accessible load after renewal as the accessible capacity for corresponding to feeder line.
It is preferred that, the method for the position of the adjustment block switch or interconnection switch is：In one feeder line section is even, contact is opened
Close or block switch by can access load is that to shift to accessible load be negative feeder line to positive feeder line.
It is preferred that, during the position of adjustment block switch or interconnection switch, meet following condition：
Wherein δ F represent to move the load variations amount in the feeder line section idol caused by the position of block switch or interconnection switch；Represent that feeder line section can access the accessible load that capacity is positive side in even；Represent that the even interior accessible capacity of feeder line section is
The accessible load of negative one side.
It is preferred that, the step of also including Set scale coefficient in step 1, in step 4, judge the accessible load after updating
When whether being non-negative, if it is judged that being no, then coefficient reduces maximum power supply value in proportion, and enters step 3.
It is preferred that, during reduction maximum power supply value, maximum power supply value is reduced to 0.9 times of former maximum power supply value.
It is preferred that, distribution feeder m accessing user's distribution transformer capacity UAC is calculated by equation below：
Wherein η is the conversion factor between load and secondary side distribution transformer capacity on primary side feeder line m；ΔFmFeedback
The difference of the theoretical load of accessible load on line m, i.e. feeder line m and feeder line m existing load.
It is preferred that, conversion factor η is according to the distribution transformer on customer charge type, load type ratio and feeder line m
Total capacity is obtained.
It is preferred that, obtained according to the distribution transformer total capacity on customer charge type, load type ratio and feeder line m
The step of obtaining conversion factor η is as follows：It is appliance load, Commercial Load or industrial load to judge customer charge type；
If appliance load, then：
If commercial load, then：
If commercial load, then：
In above formula, x1、x2And x3Appliance load size, Commercial Load size and the work on sometime section are represented respectively
Industry payload；y1、y2And y3Represent that Domestic distribution transformer total capacity, business distribution transformer total capacity and industry are matched somebody with somebody respectively
Piezoelectric transformer total capacity；β represents distribution transforming Optimal load coefficient.
Following advantageous effects can be obtained by implementing the present invention：Feeder line accessing user can be calculated by this method
Distribution transformer capacity, the feeder line accessing user's distribution transformer capacity calculated according to this method is accessed, and can cause feedback
Line will not will not meet very few and cause power network resources cannot because access overloads and produces potential safety hazard because of access
Make full use of.
Brief description of the drawings
Fig. 1 is flow chart of the invention；
Fig. 2 is the cable Single-ring network figure before interconnection switch change in the specific example of the present invention；
Fig. 3 is the cable Single-ring network figure after interconnection switch change in the specific example of the present invention；
Fig. 4 is the power distribution network schematic diagram in the specific example of the present invention；
Fig. 5 is the physical cabling figure at P in Fig. 4；
Fig. 6 is the distribution line physical cabling figure in the specific example of the present invention；
Fig. 7 for the feeder line section idol F2-F16 in the specific example of the present invention wiring diagram；
Fig. 8 for the feeder line section idol F6-F20 in the specific example of the present invention wiring diagram；
Fig. 9 is the flow chart after present invention improvement.
Embodiment
For the ease of the understanding of those skilled in the art, the present invention is made further with reference to specific embodiment
It is bright：
As shown in figure 1, a kind of feeder line accessing user's capacity calculation methods based on TSC of the present invention, comprise the following steps,
Step 1：Obtain each feeder line existing load, the load on primary side feeder line and secondary side distribution transformer capacity it
Between conversion factor；
Step 2：Calculated according to TSC models and obtain maximum power supply value (i.e. TSC value)；
Step 3：The theoretical load for obtaining each feeder line is calculated according to feeder line model；According to theoretical load and existing carry calculation
Accessible load on each feeder line；
Feeder line model is most as object function as the feeder line number of nonnegative value can access load, with the condition of TSC models
Function combination power distribution network institute on-load is that maximum power supply value is used as conditional function；
Wherein, the accessible load on feeder line is the theoretical load of feeder line and the difference of corresponding existing load；
Step 4：Judge whether the accessible load on each feeder line is non-negative, if it is judged that being yes, then by feeder line
On accessible load be used as correspondence feeder line accessible capacity；
Step 5：According to the accessible capacity and corresponding conversion factor of each feeder line, the access for obtaining distribution feeder is used
Family distribution transformer capacity.
It can be accessed by accessing user's distribution transformer capacity of distribution feeder so that feeder line will not be because of access
Overload and produce potential safety hazard, feeder line will not meet because of access it is very few and so that power network resources are not fully utilized.
In step 1, the conversion factor between load and secondary side distribution transformer capacity on primary side feeder line can be
The conversion factor between load and 0.4kV sides distribution transformer capacity on the feeder line of 10kV sides.
In step 2, TSC models can be using described in background technology《Power distribution network based on feeder interconnection relationship is maximum
Power supply capacity model》In TSC models.
Urban power distribution network line length is often shorter, and voltage drop is smaller, and can further be adjusted by reactive-load compensation equipment,
Therefore voltage constraint can be ignored in TSC models；Meanwhile, the feeder line outlet load in TSC models has contained network loss.It is comprehensive
Above-mentioned analysis, TSC models have done simplified processing to factors such as voltage, reactive powers, and the TSC models after simplifying are as follows.
TSC is maximum power supply value, FiFor main transformer i institutes on-load, FmFor feeder line m load；trfmnOccur N-1 events for feeder line m
Turn to bring feeder line n load during barrier；trtijTurn to bring main transformer j load during for main transformer i generation N-1 failures；Fm∈TiRepresent
Feeder line m comes from main transformer i corresponding bus；Fn∈TjRepresent that feeder line n comes from main transformer j corresponding bus；RFnFor feeder line n specified appearance
Amount；FnFor feeder line n load；RjFor main transformer j rated capacity；LDFor the lower limit of some heavily loaded area's load；Z is that heavily loaded area owns
Main transformer set；Any m, n are represented,Represent any i, j.
In formula (1)：
For object function, the maximum that TSC is all main transformer load sums is represented.
Equality constraint is segmented for feeder load, represents that feeder line m may be divided into multistage, each of which Duan Kezhuan
Different feeder lines are brought, all turns of load sums led out are equal to the load of the feeder line.
Turn band equality constraint for main transformer-feeder load, represent that main transformer i occurs to turn band during N-1 failures
Load to main transformer j is to be turned by the load between the feeder line that is connected with two main transformers with completion.
Constrained for feeder line N-1, represent that feeder line m occurs after N-1 failures, its load passes through feeder line
Contact turns to bring other feeder lines, and load, which turns other feeder lines after band, to be overloaded.
Constrained for main transformer N-1, represent that main transformer j receives after failure main transformer i transfer loads
The load of long-play is no more than its rated capacity；
Constrained for area load, if being meant that, some area load is very big, if any multiple heavily loaded areas, should
Main transformer load sum in region, which is more than, gives fixed load LD, then increases inequality, and in non-heavily loaded area then without inequality constraints, should
Constraint can influence distribution even the TSC size of load during TSC.
The object function of feeder line model is:It can access load most for the feeder line number of nonnegative value
Conditional function combination power distribution network institute's on-load using TSC models of feeder line model is used as condition letter as maximum power supply value
Number, be specially：
In above formula, TSC is the maximum power supply value calculated according to TSC models, if maximum power supply value passes through ratio system
Number reduction, then TSC is the maximum power supply value after reduction.
As shown in figure 9, in step 4, when whether the accessible load for judging on each feeder line is non-negative, if it is judged that
Be it is no, then：The position of block switch or interconnection switch is adjusted, is updated according to the adjustment of block switch or interconnection switch on feeder line
Can access load, (the existing load after the adjustment adjustment of block switch or interconnection switch can be changed, but theoretical load is not sent out
Changing, that is, the variable quantity that accessible load need to only add and subtract correspondingly existing load can be drawn, be those skilled in the art
It should know if the accessible load on feeder line is updated according to the adjustment of block switch or interconnection switch, herein without detailed
Illustrate), judge whether the accessible load after updating is non-negative, if it is judged that being yes, can access after renewal is born
Lotus is as the accessible capacity of feeder line is corresponded to, if it is judged that being no, then coefficient reduces TSC value in proportion, and enters step
3.Here proportionality coefficient can be set in step 1, and proportionality coefficient could be arranged to 0.9, i.e., reduce TSC by coefficient in proportion
After value, TSC value is 0.9 times of former TSC value after reduction；Likewise, proportionality coefficient can be set according to actual conditions.In order to prevent
TSC value is too small, and it is too small to calculate accessing user's distribution transformer capacity, can set TSC lower limits, TSC value is low after reduction
When TSC lower limits, accessing user's distribution transformer capacity is no longer calculated, i.e., is held without rational accessing user's distribution transformer
Amount.
The specific method and feeder line section even (Dual Feeder Sections, DFS) that adjust the position of the switch are solved herein
Release.From a block switch or interconnection switch both sides, in the opposite direction, always may search for remaining block switch,
Interconnection switch or feeder switch, then two feeder lines between the two switches are a feeder line section idol.Using Fig. 2 cables Single-ring network as
Example, interconnection switch is the B in ring main unit 2, and feeder switch is A, C, then two sections of feeder lines BA and BC are that a pair of feeder line sections are even, feeder line
BA sections of load includes F0, F1, F2 in section idol, and BC sections of load includes F3, F4, F5.
Feeder line herein can be switch (block switch or interconnection switch or feeder switch) and adjacent switch (block switch
Or interconnection switch or feeder switch) between feeder line section.
By taking Fig. 2 and Fig. 3 as an example, it is assumed that the accessible capacity of BA feeder lines be just, the accessible capacity of BC feeder lines be negative, by can
Access the computational methods of loadFmExisting load on ' expression feeder line m, Fm TSCFor the theoretical negative on feeder line m
Lotus, illustrates actual load F in BA feeder linesm' be less than TSC when theoretical loadActual load F in BC feeder linesm' be more than TSC when
Theoretical loadIn power distribution network, the actual negative of the feeder line in feeder line section idol can be changed by adjusting interconnection switch
Lotus Fm' distribution, it is clear that if now by BC actual load Fm' transfer part arrives BA, now BC Fm' reduce, BA Fm' increase
Plus, it is possible to BA accessible load had both been made full use of, has also caused BC accessible load to be changed into from negative value on the occasion of so contact
Switch B should be moved to C, operating process comparison diagram 2 and Fig. 3, and now interconnection switch changes to B' by B.Now B'A in feeder line section idol
The load of section includes F0, F1, F2, F3, and B'C sections of load includes F4, F5.The direction of above-mentioned interconnection switch movement and size, are needed
Meet following condition：
1) direction：In a feeder line section is even, interconnection switch or block switch are shifted to by can access capacity for positive feeder line
Can access capacity is negative feeder line；
2) size：After the adjustment of interconnection switch or block switch, caused load variations amount should be met：
Wherein δ F represent to move the load variations amount in the feeder line section idol caused by the position of block switch or interconnection switch；Represent that feeder line section can access the accessible load that capacity is positive side in even；Represent that the even interior accessible capacity of feeder line section is
The accessible load of negative one side.
The even essence of feeder line section is the minimum unit for giving load adjustment, and accessible capacity can directly result in feeder line section
Load adjustment in idol, namely the movement of interconnection switch or block switch position is instructed, its foundation moved is formula (2), so
By the movement of switch, power distribution network is enabled to possess the accessible capacity of maximum, and the accessible capacity of each feeder line is all
Nonnegative value.
It is to be noted that：1) feeder line section where some load is even may more than one, the herein choosing even to feeder line section
It is that feeder line section of the prioritizing selection comprising interconnection switch is even to take method；2) whether some feeder line sections be able to will occasionally be considered with practical operation
The reality of actual power distribution network, the need for Practical Project may not meet the adjustment position of the switch, main cause has：1., lead to
It is discrete to cross block switch or interconnection switch regulation load, and above-mentioned load variations amount inequality may be unsatisfactory for all the time；②、
Distribution network automated degree is not completely covered, and regulation block switch or interconnection switch are wasted time and energy.
In step 5：Distribution feeder m accessing user's distribution transformer capacity UAC is calculated by equation below：
Wherein η is the conversion factor between load and secondary side distribution transformer capacity on primary side feeder line m, such as 10kV
The conversion factor between load and 0.4kV sides distribution transformer capacity on the feeder line of side；ΔFmBorn for can access on feeder line m
The difference of the theoretical load of lotus, i.e. feeder line m and feeder line m existing load.
η can be obtained using known calculation of the prior art.The present invention is a large amount of former from extracting in order to obtain
Beginning data, random time section can be calculated, simple and practical accessing user's capacity calculation methods, this paper presents a kind of new meter
Calculate conversion factor η practical approach.Calculating conversion factor η method is according to load type, load type ratio, Yi Jikui
Distribution transformer total capacity on line is determined.Wherein, load type is broadly divided into appliance load, Commercial Load and industry and born
Lotus, classifying and dividing can be distinguished substantially according to government's land-use style；The ratio of each load type can be according to different government's lands used
The ratio of total load in type is obtained；Distribution transformer total capacity can according to the distribution transformer number of units in known line,
Calculation of capacity is obtained, i.e. total capacity=number of units * capacity.For example, for a circuit, if sometime civilian negative on section
Lotus, Commercial Load and industrial load size are respectively x1MVA, x2MVA, x3MVA, distribution transformer total capacity is respectively y1MVA,
y2MVA, y3MVA, then the conversion factor of different load type can be calculated according to equation below respectively on the circuit：
In above formula,The conversion factor of appliance load is represented,Representing will be civilian negative
The conversion factor that lotus, Commercial Load and industrial load are obtained according to different load proportion weighted；Represent full line load
Accessible size all converts the distribution transformer parameter for appliance load, withImplication is similar；β represents that distribution transforming is most preferably born
Load rate, β is variable known in the art, refers to paper《The energy-conservation of distribution transformer》, source is：East china electric power, 2010,38
(9)：1475-1477.
It can similarly obtain, for Commercial Load conversion factor ηCommerciallyAnd industrial load conversion factor ηIndustryComputational methods
For：
It is described further below by taking specific example as an example：
Have 2 transformer stations in Fig. 4,4 main transformers, 20 feeder line outlets, 22 feeder loads, be expressed as F1~
F22, it may be noted that the load at this refers to the concentrated load on feeder line, and has many loads and switch on actual feeder line, will
The physical cabling figure after feeder line amplification in Fig. 4 in the red frame P of dotted line is shown in Fig. 5.
Accessible load on each feeder line is designated as Δ F respectively1~Δ F22, feeder line is from JKLYJ-185, and capacity is complete
Portion is 11.30MVA.Transforming plant main transformer data are shown in Table 1.
The main transformer data of table 1
Table 2 is an operating point P of example power distribution network, sets forth the current load values of F1~F22, i.e., existing negative
Lotus.
The operating point P of table 2
Operating point P power load distributing is designated as Fm', under current loads level, the total payload of power distribution network is
49.75MVA。
According to TSC models, the TSC value for calculating above-mentioned power network is 114.33MVA.Can access feeder line of the load as nonnegative value
Number is at most as object function (i.e. by the accessible load on feeder lineNonnegative value number is at most used as target letter
Number), it is used as conditional function using the conditional function of TSC models and power distribution network institute on-load as 114.33MVA.Try to achieve the reason of each feeder line
By load, i.e. power load distributing3 the 3rd row are shown in Table,Represent feeder line m theoretical load.
Table 3 TSC, TSCcutLower power load distributing and accessible load
By taking the first row F1 of preceding four row in table 3 as an example, it is by the theoretical load (power load distributing) of TSC model solution feeder lines
F1 TSC=5.83MVA, existing load is F1'=2.04MVA, then F1 accessible Load Calculation Method is Δ F1 TSC=F1 TSC-F1′
=5.83-2.04=3.79MVA.F2-F22 all accessible loads (the 4th row) can similarly be obtained.According to last column (preceding 4
Row) can obtain, the total load value of present operating point is 49.75MVA, can access load total amount theoretical value be equal to 114.33 (TSC values)-
49.75=64.58MVA.
Due in the 4th rowIn the presence of 5 negative values, the position of block switch or interconnection switch is next adjusted by step 4.
It was found that for the actual power distribution network, by adjusting block switch or interconnection switch position, negative connect can not be removed completely
Enter capacity quantity, for example：By taking F22 as an example, feeder line section idol F12-F22 where it, the strokes and dots frame portion in Fig. 4, it is matched somebody with somebody
Power network physical cabling figure is shown in Fig. 6.
As shown in table 3, it is respectively 7.00MVA and -1.36MVA that both F12 and F22, which can access capacity, and one positive one is negative, contact
Switch to F22 sides move when load variations amount δ F should meet 1.36MVA≤δ F≤7.00MVA.By Fig. 6 physical cabling figures
(unit is MVA in figure) understands, when interconnection switch is moved to F22, and load variations amount discrete feeder line section idol F12-F22 is minimum
It is worth for δ F=f3=1.20MVA, less than 1.36MVA, now interconnection switch changes to 1 or 2 by initial position；Sub-minimum is δ F=
F3+f4=7.10MVA, more than 7.00MVA, now interconnection switch changes to 3 or 4 by initial position；δ F can become much larger afterwards,
More than 7.00MVA.Because δ F are unsatisfactory for 1.36MVA≤δ F≤7.00MVA all the time, illustrate no matter which kind of mode to adjust contact according to
Always there is main transformer or feeder line overload in the position of the switch, power distribution network, i.e., now no longer meet the whole network N-1 safety.So, for the reality
Behind border power distribution network, the position even by successive step block switch or interconnection switch, there is also negative accessible load.
Further.TSC is reduced to 0.9 times of initial value, TSC value is updated with this, the TSCcut tables of the TSC value after renewal
Show, i.e. TSCcut=0.9*TSC, calculate TSCcut=102.90MVA.Now, power distribution network is obtained under this power supply capacity
Power load distributing under TSCcutWith accessible capacityIt is shown in Table 3 the 5th row and the 6th row：
As seen from Table 3, adjusted by above-mentioned a small amount of reduction TSC method, point of the accessible load nonnegative value of each feeder line
Cloth be improved significantly,2 negative values are only existed, than reducing 3 negative values before reduction TSC.It is negative for can access at 2
Lotus is negative situation, is further occasionally optimized using feeder line section, that is, adjusts the position of block switch or interconnection switch.
Table 3 TSC, TSCcutLower power load distributing and accessible capacity
F2 and F20 accessible load is negative, and the feeder line section idol F2-F16 and F6-F20 where F2 and F20 is chosen respectively,
Because F2 and F20 accessible load is negative, interconnection switch should be moved to F2 and F20 respectively, and mobile load variations amount should divide
It is not 0.09MVA≤δ F1≤4.67MVA, 0.86MVA≤δ F2≤4.62MVA, feeder line section idol F2-F16's and F6-F20 is detailed
Wiring diagram is shown in Fig. 7 and Fig. 8：
From detailed wiring diagram, for feeder line section idol F2-F16, when interconnection switch is moved to interconnection switch to F2, feedback
Load variations amount minimum value discrete line segment idol F2-F16 be δ F1=f2=0.20MVA, meet 0.09MVA≤δ F1≤
4.67MVA, sub-minimum δ F1=f2+f1=0.32MVA, also meet 0.09MVA≤δ F1≤4.67MVA, it is contemplated that power load distributing
Harmony, δ F1=0.20MVA load variations are now selected as load adjustment amount, so interconnection switch is moved to Fig. 7's
1 or 2 position；For feeder line section idol F6-F20, when interconnection switch is moved to interconnection switch to F20, feeder line section idol F6-F20
Discrete load variations amount minimum value is δ F2=f3=2.00MVA, meets 0.86MVA≤δ F2≤4.62MVA, sub-minimum δ F2
=f3+f4=4.98MVA, is unsatisfactory for 0.86MVA≤δ F2≤4.62MVA, so interconnection switch is moved to the 1 of Fig. 8 or 2 position
Put.Now, the regulation scheme of complete interconnection switch is obtained, 4 are shown in Table.
The TSC of table 4cutLower load adjustment situation and accessible capacity
It can be obtained by above-mentioned analysis process：The net capability of example power distribution network is 114.33MVA, and current total load is big
Small is 49.75MVA, and power distribution network has 64.58MVA accessible total capacity, due to the initial load irrational distribution of power distribution network, is
The net capability of power distribution network is made full use of, and obtains that the accessible appearance of Practical Project (i.e. all nonnegative values) can be instructed
Amount, it is necessary to：
1) TSC is reduced to 0.9 times of initial value, and programming evaluation obtains can access capacity nonnegative value most load point
Cloth；
2) according to the positive and negative distribution that can access capacity, adjustment interconnection switch (being shown in Table 4) is instructed, improves the load point of operating point
Cloth is balanced, each feeder line is can access all nonnegative values of capacity, and final result is shown in Table 5：
The TSC of table 5cutThe accessible capacity of full non-negative down
According to the accessible capacity of each feeder line of table 5, with reference to statutory regulation land-use style in power supply area on each feeder line,
The distribution transforming total capacity of each land used, the total load of each land used, distribution transforming Optimal load coefficient β take 95%, and distribution transforming Optimal load coefficient can join
Examine：The energy-conservation east china electric powers of distribution transformer, 2010,38 (9)：1475-1477, is that can obtain according to formula (4), (5), (6)
Accessing user's capacity of different load type.
By taking Fig. 3 feeder lines F1 as an example, it is 2.67MVA to obtain it to can access capacity according to table 5.Exist by transferring Fig. 3 power networks
PMS2.0 data can be obtained, and its load is divided into appliance load, Commercial Load and industrial load, payload be respectively 0.81MVA,
0.72MVA, 0.51MVA, total load size are 2.04MVA, and the access distribution transforming total capacity of three kinds of load types is respectively
1.10MVA、1.10MVA、1.05MVA.It can be obtained according to formula (4), the coefficient of load of appliance load is on circuit F1：
The coefficient of load that Commercial Load and industrial load are obtained according to formula (5), (6) is respectively ηCommercially=0.65, ηIndustry=
0.46.According to formula (3), accessing user's capacity UAC of appliance load, Commercial Load and industrial load meter on Fig. 3 feeder lines F1
Calculating result is respectively：3.69MVA、4.08MVA、5.77MVA.In the method, the people for obtaining remaining each feeder line can also be calculated
With accessing user's capacity of load, Commercial Load and industrial load.
The specific embodiment of the present invention is the foregoing is only, but the technical characteristic of the present invention is not limited thereto, Ren Heben
The technical staff in field is in the field of the invention, and the change or modification made all are covered among the scope of the claims of the present invention.
Claims (10)
1. a kind of feeder line accessing user's capacity calculation methods based on TSC, it is characterised in that：Comprise the following steps,
Step 1：Obtain between the load and secondary side distribution transformer capacity on each feeder line of existing load, primary side of each feeder line
Conversion factor；
Step 2：Calculated according to TSC models and obtain maximum power supply value；
Step 3：The theoretical load for obtaining each feeder line is calculated according to feeder line model；Respectively presented according to theoretical load and existing carry calculation
Accessible load on line；
Feeder line model is most as object function as the feeder line number of nonnegative value can access load, with the conditional function of TSC models
It is that maximum power supply value is used as conditional function with reference to power distribution network institute on-load；
Wherein, the accessible load on feeder line is the theoretical load of feeder line and the difference of corresponding existing load；
Step 4：Judge whether the accessible load on each feeder line is non-negative, if it is judged that being yes, then by feeder line
Load be can access as the accessible capacity of correspondence feeder line；
Step 5：According to the accessible capacity and corresponding conversion factor of each feeder line, the accessing user for obtaining distribution feeder matches somebody with somebody
Piezoelectric transformer capacity.
2. a kind of feeder line accessing user's capacity calculation methods based on TSC as claimed in claim 1, it is characterised in that：Step 2
In TSC models be：
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TSC is maximum power supply value, FiFor main transformer i institutes on-load, FmFor feeder line m load；trfmnWhen occurring N-1 failures for feeder line m
Turn to bring feeder line n load；trtijTurn to bring main transformer j load during for main transformer i generation N-1 failures；Fm∈TiRepresent feeder line
M comes from main transformer i corresponding bus；Fn∈TjRepresent that feeder line n comes from main transformer j corresponding bus；RFnFor feeder line n rated capacity；Fn
For feeder line n load；RjFor main transformer j rated capacity；LDFor the lower limit of some heavily loaded area's load；Z is all main transformer collection in heavily loaded area
Close.
3. a kind of feeder line accessing user's capacity calculation methods based on TSC as claimed in claim 3, it is characterised in that：Judge
When whether the accessible load on each feeder line is non-negative, if it is judged that being no, then block switch or interconnection switch are adjusted
Position, the position of adjustment block switch or interconnection switch is updated on feeder line according to the adjustment of block switch or interconnection switch
Load is can access, judges whether the accessible load after updating is non-negative, if it is judged that being yes, by connecing after renewal
Enter load as the accessible capacity of correspondence feeder line.
4. a kind of feeder line accessing user's capacity calculation methods based on TSC as claimed in claim 4, it is characterised in that：It is described
The method of position of adjustment block switch or interconnection switch is：In one feeder line section is even, interconnection switch or block switch are by that can connect
It is that to shift to accessible load be negative feeder line to positive feeder line to enter load.
5. a kind of feeder line accessing user's capacity calculation methods based on TSC as claimed in claim 5, it is characterised in that：Adjustment
During the position of block switch or interconnection switch, following condition is met：
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Wherein δ F represent to move the load variations amount in the feeder line section idol caused by the position of block switch or interconnection switch；
Represent that feeder line section can access the accessible load that capacity is positive side in even；Represent that the even interior accessible capacity of feeder line section is negative
The accessible load of side.
6. a kind of feeder line accessing user's capacity calculation methods based on TSC as claimed in claim 5, it is characterised in that：Step 1
In the step of also include Set scale coefficient, in step 4, when whether judge the accessible load after renewal be non-negative, if
Judged result is no, then coefficient reduces maximum power supply value in proportion, and enters step 3.
7. a kind of feeder line accessing user's capacity calculation methods based on TSC as claimed in claim 6, it is characterised in that：Reduction
During maximum power supply value, maximum power supply value is reduced to 0.9 times of former maximum power supply value.
8. a kind of feeder line accessing user's capacity calculation methods based on TSC as claimed in claim 1, it is characterised in that：Distribution
Net feeder line m accessing user's distribution transformer capacity UAC is calculated by equation below：
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</mrow>
Wherein η is the conversion factor between load and secondary side distribution transformer capacity on primary side feeder line m；ΔFmOn feeder line m
Accessible load, i.e. feeder line m theoretical load and feeder line m existing load difference.
9. a kind of feeder line accessing user's capacity calculation methods based on TSC as claimed in claim 8, it is characterised in that：Conversion
Coefficient η is obtained according to the distribution transformer total capacity on customer charge type, load type ratio and feeder line m.
10. a kind of feeder line accessing user's capacity calculation methods based on TSC as claimed in claim 9, it is characterised in that：According to
The step of distribution transformer total capacity on customer charge type, load type ratio and feeder line m obtains conversion factor η is such as
Under：Judge that customer charge type is appliance load, Commercial Load or industrial load, if appliance load, then：
If commercial load, then：
If commercial load, then：
In above formula, x1, x2 and x3 represent that appliance load size, Commercial Load size and industry on sometime section are negative respectively
Lotus size；Y1, y2 and y3 represent that Domestic distribution transformer total capacity, business distribution transformer total capacity and industrial power distribution become respectively
Depressor total capacity；β represents distribution transforming Optimal load coefficient.
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