CN105391055B - A kind of overload size collection of N 1 based on security domain determines method - Google Patents
A kind of overload size collection of N 1 based on security domain determines method Download PDFInfo
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- CN105391055B CN105391055B CN201510789053.0A CN201510789053A CN105391055B CN 105391055 B CN105391055 B CN 105391055B CN 201510789053 A CN201510789053 A CN 201510789053A CN 105391055 B CN105391055 B CN 105391055B
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Classifications
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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
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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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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- 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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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
- H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
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Abstract
Method is determined the invention discloses a kind of overload size collection of N 1 based on security domain, including：Any secure border is divided into feeder fault type boundaries and main transformer fault type border, output fault feeder or failure main transformer, fault type is indicated, primary fault collection is formed；The fault feeder that primary fault is concentrated directly is exported, and is used as the element in final fault set；Judged with reference to the failure main transformer, the standby main transformer of failure main transformer that primary fault is concentrated by safe distance, acquisition can not turn on-load, turn on-load with stopping, and acquisition of summing turns with the minimum load value of rear main transformer；If load value is more than the standby main transformer capacity of failure main transformer, the standby main transformer of failure main transformer and failure main transformer is added to final fault set；The overload size in the case of N 1 is obtained by final fault set, safe distance.Find that this method has very big lifting than the simulation methods of N 1 in calculating speed, with accuracy and rapidity advantage according to the inspection of actual electric network.
Description
Technical field
The present invention relates to power distribution network security domain field, more particularly to one kind is with power distribution network security domain screening main transformer or feeder line
After element N-1 failures, the method for determining element overload size.With it, the N-1 of any given power distribution network can be determined
The overload size of remaining element after failure.
Background technology
In power distribution network, the problem of safe and highly efficient operation is always noticeable[1].Traditional power distribution network safety evaluation side
Method is mainly N-1 simulation methods[2-4], and be also most widely used power distribution network safe evaluation method all the time.Distribution system
N-1 verification mainly include two kinds of scenes of main transformer N-1 failures and feeder line N-1 failures.
Wherein, when feeder line N-1 verifications are examination wall scroll feeder line outlet failures, feeder line or feeder line section load can be turned to take to
The feeder line of other contacts；When main transformer N-1 verifications are examination main transformer failures, can main transformer institute on-load be got in touch with by the way that in station or station is outer
Main transformer carry out turning band, if there is feeder line or main transformer element has exceeded its corresponding capacity-constrained after turning band, obtain corresponding
The overload size of element.
Therefore the above method is whether the load that current power distribution network is verified with failure one by one (case) meets safe operation
Whether safely condition, finally give power distribution network, determine fault set, overload element and overload size.But this method is often needed
Calculating time that will be longer, it is difficult to accomplish online direction distribution network operation.
The content of the invention
Method is determined the invention provides a kind of N-1 overload size collection based on security domain, can be obtained by the present invention
Obstructed out-of-date, the overload size of remaining main transformer or feed element is verified to any given power distribution network main transformer and feed element N-1,
The calculating time is improved, it is described below：
A kind of N-1 overload size collection based on security domain determines method, and the determination method comprises the following steps：
According to the feature of power load distributing in secure border expression formula, any secure border is divided into feeder fault type boundaries
With main transformer fault type border, output fault feeder or failure main transformer indicate fault type, form primary fault collection；
The fault feeder that primary fault is concentrated directly is exported, and is used as the element in final fault set；
Judged with reference to the failure main transformer, the standby main transformer of failure main transformer that primary fault is concentrated by safe distance, obtained
On-load can not be turned, turn on-load with stopping by taking, and acquisition of summing turns with the minimum load value of rear main transformer；
If load value is more than the capacity of the standby main transformer of failure main transformer, by failure main transformer and the standby main transformer of failure main transformer
It is added to final fault set；
The overload size in the case of N-1 is obtained by final fault set, safe distance.
Wherein, the secure border includes：Feeder line capacity-constrained secure border and main transformer capacity constraint secure border,
The feeder line capacity-constrained secure border, main transformer capacity constraint secure border are obtained by power distribution network security domain
Take.
Wherein, in the expression formula according to secure border power load distributing feature, any secure border is divided into feeder line therefore
Barrier type boundaries and the step of main transformer fault type border it is specially：
It is negative secure border formation contact unit load collection to safe distance；Judge contact unit load collection whether have and
Only one of which load is with remaining load not in same main transformer；
If it is, main transformer where output feeder fault type, fault feeder, fault feeder is to primary fault collection；
If not, output main transformer fault type, failure main transformer to primary fault collection.
Wherein, the on-load that can not turn is specially：
On the standby main transformer of failure main transformer and failure main transformer, safe distance occur the feeder line of negative value or feeder line section load and
Turn the feeder line of band or the summation of feeder line section load to standby main transformer.
Wherein, the stopping turns on-load and is specially：
On the standby main transformer of failure main transformer and failure main transformer, turn band and arrive at a station the feeder line or feeder line section load of outer same main transformer
Smaller value summation.
Wherein, if the load value is more than the standby main transformer capacity of failure main transformer, by the standby of failure main transformer and failure main transformer
The step of being added to final fault set with main transformer be specially：
The standby main transformer of failure main transformer and failure main transformer is added to final fault set, and failure master is exceeded according to load value
The size of the standby main transformer capacity become determines to turn band scheme；
If the element testing that primary fault is concentrated is finished, final fault set is exported.
Wherein, it is described by final fault set, safe distance obtain N-1 in the case of overload size the step of it is specific
For：
To the element in final fault set, the safe distance of its corresponding secure border is obtained, by the size of safe distance
It is used as overload size.
The beneficial effect for the technical scheme that the present invention is provided is：The present invention proposes a kind of safe domain method of application and obtains distribution
Net the computational methods of the element overload size after N-1 failures.This method passes through primary fault collection and the realization pair of final fault set
Main transformer or feed element N-1 verifications.Because this method and N-1 simulation methods have identical security constraint, therefore knot can be ensured
The accuracy of fruit；This method calculates N-1 secure borders previously according to network structure and parameter, it is not necessary to emulates, therefore can protect
Demonstrate,prove the rapidity of calculating process.Found according to the inspection of actual electric network, this method is obtained than N-1 simulation method in calculating speed
Very big lifting, shows that this method has the advantages that accuracy and rapidity.
Brief description of the drawings
Fig. 1 is the flow chart for determining primary fault collection (OS) algorithm；
Fig. 2 is the flow chart that primary fault collection OS is handled to the main transformer element of final fault set (FS)；
Fig. 3 is the flow chart that a kind of N-1 overload size collection based on security domain determines method；
Fig. 4 is the schematic diagram of example.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, further is made to embodiment of the present invention below
It is described in detail on ground.
With the progressively popularization of intelligent power grid technology, more and more important, the N-1 failures quickly become in line computation guidance tool
Element overload degree afterwards is as an important information, it is necessary to find the N-1 that new efficient method provides power distribution network in real time
Element overload size after failure.In recent years, safe domain method[5]Progressively promoted in power distribution network, this method is previously according to network knot
Structure and parameter calculate N-1 secure borders, it is not necessary to emulate, and can calculate electricity by judging that operating point is quick inside and outside secure border
Whether net is safe[6], then safe or dangerous degree is weighed to the distance of secure border according to operating point, with obtaining in real time
The ability of remaining element overload size after N-1 failures.Because the premise of safe domain method works, and it need not be emulated, because
The calculating speed of this safe domain method is greatly speeded up, and this method is further studied so that safe domain method can provide N-1 failures in real time
Overload size afterwards, with very strong superiority.
This method has obtained the big subtotal of element overload after power distribution network main transformer and feeder line N-1 failures according to safe domain method
Calculation method, this method meets accuracy and rapidity simultaneously.
Embodiment 1
A kind of N-1 overload size collection based on security domain determines method, referring to Fig. 1, Fig. 2 and Fig. 3, this method include with
Lower step：
101：By power distribution network security domain, the feeder line capacity-constrained secure border and main transformer capacity of each load are obtained
Constrain secure border；
102：According to the feature of power load distributing in secure border expression formula, any secure border is divided into feeder fault type
Border and main transformer fault type border, output fault feeder or failure main transformer, indicate fault type, form primary fault collection；
103：The fault feeder that primary fault is concentrated directly is exported, and is used as the element in final fault set；
104：Sentenced with reference to the failure main transformer, the standby main transformer of failure main transformer that primary fault is concentrated by safe distance
Disconnected, acquisition can not turn on-load, turn on-load with stopping, and acquisition of summing turns with the minimum load value of rear main transformer；
105：If load value is more than the standby main transformer capacity of failure main transformer, by the standby master of failure main transformer and failure main transformer
Change is added to final fault set；
106：The overload size in the case of N-1 is obtained by final fault set, safe distance.
In summary, the embodiment of the present invention can obtain any given distribution host by above-mentioned steps 101- steps 106
Become and feed element N-1 verifies obstructed out-of-date, the overload size of remaining main transformer or feed element, improve the calculating time, it is full
The need in foot practical application.
Embodiment 2
The scheme in embodiment 1 is described in detail with reference to specific computing formula, example, it is as detailed below：
201：By power distribution network security domain, the feeder line capacity-constrained secure border and main transformer capacity of each load are obtained
Constrain secure border；
Wherein, power distribution network security domain can be write as below formula：
In formula (1), DSSR is security domain；F1、F2……FnRepresent feeder line or feeder line section load (that is, in simply connected network situation
Under, FnRepresent the simply connected network feeder load；In the case of many contacts, FnExpression can turn to bring the feeder line or feeder line of outer circuit of standing
Section load)；FmRepresent and FnThere are the feeder line or feeder line section load of communication relationship；FjRepresent and FmIt is connected on other feedbacks of same main transformer
Line or feeder line section load；FkWith F after expression failurenIt is connected on other loads of same main transformer；RFmRepresent that feeder line m maximum transmitted is held
Amount；TiRepresent FnThe main transformer at place；TjRepresent FnTurn the offside main transformer taken to, R after failureiRepresent main transformer TiRated capacity.By
Above-mentioned n groups security constraint inequality formation security domain DSSR.
Both include feeder line capacity-constrained in each group of inequality, also including a main transformer capacity constraint, when two about
When the equal sign of beam is set up respectively, two secure borders are formed, are respectively：
I:RFm-Fm-Fn=0
II:
The embodiment of the present invention represents the feeder line capacity-constrained secure border of each load with I, and each load is represented with II
Main transformer capacity constrains secure border, and each secure border is the hyperplane in n dimension theorem in Euclid space.
In security domain, the Calculation of Safety Distance method of power distribution network given point to above-mentioned 2 secure borders is respectively：
dn=RFm-Fm-Fn
Wherein, dnFor the safe distance of operating point to feeder line capacity-constrained secure border；DnFor operating point to main transformer capacity about
The safe distance of beam secure border.
202：Determine primary fault collection；
Fig. 1 illustrates the method for obtaining fault type and fault element (feeder line or main transformer) by any secure border, and
According to accordingly obtaining primary fault collection (OS).In Fig. 1, contact unit load collection Φ refers to the institute included in secure border expression formula
There is the set of feeder line or feeder line section load.
1) any secure border h is selectedi, as secure border hiBelong to the secure border of feeder line capacity-constrained, then use formula
(3) first formula in calculates safe distance；As secure border hiBelong to the secure border of main transformer capacity constraint, then use formula
(3) second formula in calculates safe distance；
2) judge whether safe distance is less than 0；If not, re-executing step 1)；If it is, performing step 3)；
3) it is negative secure border h to above-mentioned safe distanceiForm contact unit load collection Φ；Judge contact unit load
Whether collection Φ has and only one of which load and remaining load be not in same main transformer；If it is, performing step 4)；If not, performing
Step 5)；
4) for secure border hi, output safety border numbering, feeder fault type, fault feeder, fault feeder place
Main transformer (regarding as failure main transformer) arrive primary fault collection OS, perform step 6)；
5) for secure border hi, output safety border numbering, main transformer fault type, failure main transformer to primary fault collection
OS, performs step 6)；
6) judge whether to have calculated all secure borders, if it is, output primary fault collection OS, flow terminates；If not,
Perform step 1).
203：It is determined that final fault set.
Wherein, the fault feeder among primary fault collection OS is directly exported, and is used as final fault set (FS) element.Initial event
Failure main transformer among barrier collection OS is output to final fault set FS after being handled according to Fig. 2 flow chart.
1) a failure main transformer T in selection primary fault collection OS；
2) whether failure judgement main transformer T standby main transformer is in primary fault collection OS, if it is, performing step 3)；If
It is no, re-execute step 1)；
3) by failure main transformer T and failure main transformer T standby main transformer, there is the feeder line of negative value in safe distance or feeder line section is negative
The summation of lotus and the feeder line from band to standby main transformer or feeder line section load that turn is defined as that on-load can not be turned, and can not turn on-load note
For ∑ F'；
That is, the feeder line or feeder line section load that can not turn band are summed, this sub-load does not turn band, including safe distance
There is the feeder line or feeder line section load and the feeder line from band to the standby main transformer of failure main transformer or feeder line section load that turn of negative value.
4) band on failure main transformer T and failure main transformer T standby main transformer, will be turned to arrive at a station the feeder line or feeder line of outer same main transformer
The summation of the smaller value of section load is defined as stopping and turns on-load, and stopping turns on-load and is designated as ∑ F ".
That is, by turn take to the feeder line of main transformer or feeder line section load outside the same station smaller value add and, so that larger
Feeder line or feeder line section load preferentially turn lead out, leave less feeder line or feeder line section load do not turn band.
5) turn on-load ∑ F " summations to on-load ∑ F' and stopping can not be turned, be designated as ∑ F；
By above twice plus and, can obtain turning with rear main transformer minimum a feeder line or feeder line section load summation ∑ F, if
The value is less than the standby main transformer capacity of failure main transformer, then illustrates failure main transformer N-1 safety, otherwise illustrate dangerous.
6) judge whether ∑ F is more than the standby main transformer capacity of failure main transformer, if it is, performing step 7)；If not, performing
Step 1)；
7) failure main transformer T and failure main transformer standby main transformer are added to final fault set, and failure master is exceeded according to ∑ F
The size of the standby main transformer capacity become determines to turn band scheme；
Wherein, follow-up turn band scheme is known to those skilled in the art, and the embodiment of the present invention is not repeated this.
8) whether the failure main transformer in primary fault collection OS is verified, if it is, exporting final fault set FS, flow knot
Beam；If not, performing step 1).
That is, the N-1 based on security domain can be obtained according to above-mentioned steps to verify not by fault set.
204：Determine overload size.
That is, a final fault set element is selected, final fault set is looked into and obtains corresponding secure border, calculate safety
Distance, regard the size of safe distance as the overload size in the case of element N-1.
For example, determining corresponding secure border according to final fault set element, the safe distance of the secure border is Cm-
Fi-…-Fj=dn(or Dn) (dnOr Dn<0), in formula, CmRepresent element m capacity, Fi..., FjRepresent the feedback in contact unit
Line or feeder line section load.The overload size for showing element m is | dn| or | Dn|。
That is, the secure border that its corresponding safe distance is negative value is searched according to final fault set element, if the safe edge
The confinement element on boundary is feeder line, then calculates safe distance with first formula in formula (3)；If the confinement element of the secure border
For main transformer, then safe distance is calculated with second formula in formula (3).
In summary, the embodiment of the present invention can obtain any given distribution host by above-mentioned steps 201- steps 204
Become and feed element N-1 verifies obstructed out-of-date, the overload size of remaining main transformer or feed element, improve the calculating time, it is full
The need in foot practical application.
Embodiment 3
Feasibility checking is carried out to the scheme in Examples 1 and 2 with reference to specific experiment, formula, it is as detailed below to retouch
State：
The grid structure of example power network is as shown in figure 4, have 2 transformer stations, 4 main transformers, 20 feeder line outlets, 22 feedbacks
Line or feeder line section load, numbering 1~22 represent F respectively1~F22, feeder line is from JKLYJ-185, and its permission capacity is
11.30MVA.Transforming plant main transformer data are shown in Table 1；The load level data of current distribution are shown in Table 2.
The main transformer essential information of table 1
The load level of table 2
1) secure border and safe distance of power distribution network are calculated, the security domain of current power distribution network is：
F1≤min(RF11-F11,R3-F11-F12-F13-F14-F15-F21)
F2≤min(RF16-F16,R4-F16-F17-F18-F19-F20)
F3≤min(RF10-F10,R2-F6-F7-F8-F9-F10-F4-F5)
F4≤min(RF9-F9,R2-F6-F7-F8-F9-F10-F4-F5)
F5≤min(RF8-F8,R2-F6-F7-F8-F9-F10-F3-F4)
F6≤min(RF20-F20,R4-F16-F17-F18-F19-F20-F7)
F7≤min(RF17-F17,R4-F16-F17-F18-F19-F20-F6)
F8≤min(RF5-F5,R1-F1-F2-F3-F4-F5-F9-F10)
F9≤min(RF4-F4,R1-F1-F2-F3-F4-F5-F8-F10)
F10≤min(RF3-F3,R1-F1-F2-F3-F4-F5-F8-F9)
F11≤min(RF1-F1,R1-F1-F2-F3-F4-F5-F13-F21) (4)
F12≤min(RF6-F6-F22,R2-F6-F7-F8-F9-F10-F22)
F13≤min(RF2-F2-F21,R1-F1-F2-F3-F4-F5-F11-F21)
F14≤min(RF18-F18,R4-F16-F17-F18-F19-F20-F15)
F15≤min(RF19-F19,R4-F16-F17-F18-F19-F20-F14)
F16≤min(RF2-F2-F21,R1-F1-F2-F3-F4-F5-F21)
F17≤min(RF7-F7,R2-F6-F7-F8-F9-F10-F22-F20)
F18≤min(RF14-F14,R3-F11-F12-F13-F14-F15-F19)
F19≤min(RF15-F15,R3-F11-F12-F13-F14-F15-F18)
F20≤min(RF6-F6-F22,R2-F6-F7-F8-F9-F10-F22-F17)
F21≤min(RF13-F13,R3-F11-F12-F13-F14-F15-F1)
F22≤min(RF12-F12,R3-F11-F12-F13-F14-F15)
Obtaining secure border according to security domain is：
RF11-F11-F1=0, R3-F11-F12-F13-F14-F15-F21-F1=0
RF16-F16-F2=0, R4-F16-F17-F18-F19-F20-F2=0
RF10-F10-F3=0, R2-F6-F7-F8-F9-F10-F4-F5-F3=0
RF9-F9-F4=0, R2-F6-F7-F8-F9-F10-F4-F5-F4=0
RF8-F8-F5=0, R2-F6-F7-F8-F9-F10-F3-F4-F5=0
RF20-F20-F6=0, R3-F16-F17-F18-F19-F20-F7-F6=0
RF17-F17-F7=0, R4-F16-F17-F18-F19-F20-F6-F7=0
RF5-F5-F8=0, R1-F1-F2-F3-F4-F5-F9-F10-F8=0
RF4-F4-F9=0, R1-F1-F2-F3-F4-F5-F8-F10-F9=0
RF3-F3-F10=0, R1-F1-F2-F3-F4-F5-F8-F9-F10=0
RF1-F1-F11=0, R1-F1-F2-F3-F4-F5-F13-F21-F11=0 (5)
RF6-F6-F22-F12=0, R2-F6-F7-F8-F9-F10-F22-F12=0
RF2-F2-F21-F13=0, R1-F1-F2-F3-F4-F5-F11-F21-F13=0
RF18-F18-F14=0, R4-F16-F17-F18-F19-F20-F15-F14=0
RF19-F19-F15=0, R4-F16-F17-F18-F19-F20-F14-F15=0
RF2-F2-F21-F16=0, R1-F1-F2-F3-F4-F5-F21-F16=0
RF7-F7-F17=0, R2-F6-F7-F8-F9-F10-F22-F20-F17=0
RF14-F14-F18=0, R3-F11-F12-F13-F14-F15-F19-F18=0
RF15-F15-F19=0, R3-F11-F12-F13-F14-F15-F18-F19=0
RF6-F6-F22-F20=0, R2-F6-F7-F8-F9-F10-F22-F17-F20=0
RF13-F13-F21=0, R3-F11-F12-F13-F14-F15-F1-F21=0
RF12-F12-F22=0, R3-F11-F12-F13-F14-F15-F22=0
Operating point is respectively to the safe distance of above-mentioned secure border：
The safe distance of table 3
Note：H1I represents secure border h1 feeder line capacity-constrained, and h1II represents secure border h1 main transformer capacity constraint.
2) primary fault collection is calculated
Primary fault collection element is screened for negative numerical value according to the safe distance of table 3, as a result for：
The primary fault collection of table 4
3) final fault set is calculated
The feed element of table 4 is directly output to final fault set.
Main transformer element R1, R2 standby main transformer each other, main transformer element R3, R4 standby main transformer each other, all should according to Fig. 2 flow
Figure is analyzed：
R1, R2's can not turn on-load for F1, F3, F4, F5, F8, F9, F10, and summation amounts to 37.64MVA；R3, R4 do not have
On-load can not be turned, summation is calculated as 0MVA.
R1, R2 stopping turn on-load for F21, F6, F7, and summation amounts to 12.22MVA；R3, R4 stopping turn on-load
For F12, F20, summation amounts to 5.54MVA.
By R1, R2 can not turn on-load and stopping turn on-load add and, amount to 49.86MVA, that is, turn with rear main transformer most
Small load value is more than main transformer capacity 40MVA, so main transformer R1, R2 are simultaneously final fault set element；By can not turning for R3, R4
On-load and stopping turn on-load add and, amount to 5.54MVA, that is, turn with the minimum load value of rear main transformer less than main transformer capacity
40MVA, so main transformer R3, R4 are not final fault set elements.
Obtained final fault set is：
The final fault set of table 5
4) overload size is calculated
The element in final fault set, the safe distance of the corresponding secure border of computing element are obtained, and then obtains element
Overload size：
The overload size collection of table 6
5) correctness and rapidity checking
Correctness：
Above-described embodiment is verified with N-1 simulation methods, N-1 simulation results are：
The overload size collection of the N-1 of table 7 emulation
Table 7 is contrasted with table 6, it is found that this method calculates the result of overload size collection and N-1 simulation methods calculate overload
The result of size collection is identical.
Rapidity：
For this method programming realization and verify, the processor used is the@of Intel (R) Core (TM) i5 CPU M 430
2.27GHz, inside saves as 4GB, and system is the Ultimates of Microsoft Windows 7, programming language C++.For above-described embodiment,
The time that computing element overload size integrates is 2ms.The calculating time of N-1 simulation method computing element overload size collection is
56ms.Illustrate that this method has the advantages that rapidity.
Bibliography：
[1] Xiao Jun, He Qibo, Soviet Union's step intelligent distribution network safe and highly efficient operation pattern [J] the electric power of rue based on security domain
System automation, 2014,38 (19)：52-60
[2] Liu Lifeng, Li Zhimai, Guo Xiao brightness power distribution network N-1 algorithm researches apply [J] Shaanxi Powers, 2010,38 (2)：
46-49
[3] Hayashi Y, Matsuki J.Loss minimum configuration of distribution
system considering N-1 security of dispersed generators[J].IEEE Trans on
Power System, 2004,19 (1)：636-642
[4] Shu Hongchun, Zhang Jingfang, Complicated Distribution Network reliability interval analysis [J] electricity of Liu ancestor soldier based on Feeder partitioning
Network technology, 2008,32 (19)：37-41
[5] Xiao Jun, Gu Wenzhuo, security domain models [J] the Automation of Electric Systems of king into mountain towards intelligent distribution system,
2013,37 (8)：14-19
[6] patent：Xiao Jun, Wang Chengshan, Yu Yixin, a kind of evaluation method based on distribution system security region of paddy text Zhuo are
Granted patent, CN201110283824.0
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Sequence number is for illustration only, and the quality of embodiment is not represented.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modifications, equivalent substitutions and improvements made etc. should be included within the scope of the present invention.
Claims (3)
1. a kind of N-1 overload size collection based on security domain determines method, it is characterised in that the determination method includes following
Step：
According to the feature of power load distributing in secure border expression formula, any secure border is divided into feeder fault type boundaries and master
Become failure type boundaries, output fault feeder or failure main transformer, indicate fault type, form primary fault collection；
The fault feeder that primary fault is concentrated directly is exported, and is used as the element in final fault set；
Judged with reference to the failure main transformer, the standby main transformer of failure main transformer that primary fault is concentrated by safe distance, obtained not
On-load can be turned, turn on-load with stopping, and acquisition of summing turns with the minimum load value of rear main transformer；
If load value is more than the capacity of the standby main transformer of failure main transformer, the standby main transformer of failure main transformer and failure main transformer is added to
Final fault set；
The overload size in the case of N-1 is obtained by final fault set, safe distance；
Wherein, in the expression formula according to secure border power load distributing feature, any secure border is divided into feeder fault class
The step of type border and main transformer fault type border is specially：
It is negative secure border formation contact unit load collection to safe distance；Judge whether contact unit load collection has and only have
One load is with remaining load not in same main transformer；
If it is, main transformer where output feeder fault type, fault feeder, fault feeder is to primary fault collection；
If not, output main transformer fault type, failure main transformer to primary fault collection；
The on-load that can not turn is specially：
On the standby main transformer of failure main transformer and failure main transformer, there is the feeder line of negative value or feeder line section load and to standby in safe distance
Turn the feeder line of band or the summation of feeder line section load with main transformer；
The stopping turns on-load and is specially：
On the standby main transformer of failure main transformer and failure main transformer, turn band arrive at a station outer same main transformer feeder line or feeder line section load compared with
The summation of small value；
It is described by final fault set, safe distance obtain N-1 in the case of overload size the step of be specially：
To the element in final fault set, obtain the safe distance of its corresponding secure border, using the size of safe distance as
Overload size.
2. a kind of N-1 overload size collection based on security domain according to claim 1 determines method, it is characterised in that
The secure border includes：Feeder line capacity-constrained secure border and main transformer capacity constraint secure border,
The feeder line capacity-constrained secure border, main transformer capacity constraint secure border are obtained by power distribution network security domain.
3. a kind of N-1 overload size collection based on security domain according to claim 1 determines method, it is characterised in that
If the load value is more than the standby main transformer capacity of failure main transformer, the standby main transformer of failure main transformer and failure main transformer is added to most
The step of whole fault set is specially：
The standby main transformer of failure main transformer and failure main transformer is added to final fault set, and according to load value beyond failure main transformer
The size of standby main transformer capacity determines to turn band scheme；
If the element testing that primary fault is concentrated is finished, final fault set is exported.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368610A (en) * | 2011-09-22 | 2012-03-07 | 天津大学 | Evaluation method based on distribution system security region |
| CN103400202A (en) * | 2013-07-17 | 2013-11-20 | 天津大学 | Distribution system security region boundary calculation method based on feeder interconnection relationship |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368610A (en) * | 2011-09-22 | 2012-03-07 | 天津大学 | Evaluation method based on distribution system security region |
| WO2013040948A1 (en) * | 2011-09-22 | 2013-03-28 | 天津大学 | Domain-based safety evaluation method for power distribution system |
| CN103400202A (en) * | 2013-07-17 | 2013-11-20 | 天津大学 | Distribution system security region boundary calculation method based on feeder interconnection relationship |
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| Title |
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| 基于馈线互联关系的配电网安全域模型;肖峻等;《电力系统保护与控制》;20151016;第43卷(第20期);全文 * |
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