CN107959284A - A kind of power flow transfer recognizer based on multiple branch circuit excision and away from path - Google Patents

A kind of power flow transfer recognizer based on multiple branch circuit excision and away from path Download PDF

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Publication number
CN107959284A
CN107959284A CN201610894008.6A CN201610894008A CN107959284A CN 107959284 A CN107959284 A CN 107959284A CN 201610894008 A CN201610894008 A CN 201610894008A CN 107959284 A CN107959284 A CN 107959284A
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branch
trend
excision
power flow
flow transfer
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任建文
易琛
何培成
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North China Electric Power University
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North China Electric Power University
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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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/04—Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
    • G06Q10/047—Optimisation of routes or paths, e.g. travelling salesman problem
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply
    • 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
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks

Abstract

The present invention provides a kind of power flow transfer recognizer based on multiple branch circuit excision and away from path, and this method comprises the following steps：I, the trend composition being transferred on non-faulting branch is analyzed, when multiple branch circuit excision occurs, the transfer trend on branch k can regard the superposition that trend on branch k is transferred to after a plurality of branch using equivalent trend as initial trend is individually cut-off as；Deviate from routing algorithm in II, foundation graph search, the preceding K bars shortest path in certain node depth between search excision two end node of branch, determines the larger regional extent of power flow transfer；III, the real-time running state for considering power grid, give the selection principle of transmission cross-section, finally identify that actual trend increases larger branch collection, and can successfully find out the circuit that trend inversely increases.Important improvement is made in terms of the power flow transfer estimation, the selection of K values and section criterion of excision branch in the present invention.

Description

A kind of power flow transfer recognizer based on multiple branch circuit excision and away from path
Technical field
It is a kind of based on branched specifically the present invention relates to grid company protecting electrical power system and security control field Road is cut off and the power flow transfer recognizer away from path.
Background technology
The power flow transfer as caused by being cut off fault branch is that countries in the world occur that transmission line of electricity is chain cuts in recent years in power grid Except the major reason of accident, the safe and stable operation of system is seriously endangered.In this context, grid dispatching center is stringent at present According to《Guiding rules of power system safety and stability》It is required that arrange power system operating mode, strict implement " N-1 " criterion, such as equipment in operation The operation such as maintenance, unit regulation and control, eliminates safe hidden trouble, can so make by single in time when system running state changes Element, which is cut-off, triggers the probability of branch cascading trip less and less；But most domestic power grid is also not reaching to and can resist The intensity of the same a plurality of branch excision catastrophe failure of section, this is primarily due on the one hand verification and calculates complexity, if on the other hand Meet that multiple branch circuit excision safety check need to improve the thermostabilization power limit of circuit.Feelings are cut off to multiple branch circuit since power grid lacks The counter-measure of condition, back-up protection excision circuit of leaving when such failure occurs, considerably increases the chain jump of transmission line of electricity The probability of lock.So the behavioural analysis of the transmission cross-section after being cut off to a plurality of branch, that is, rapidly find out the larger branch of power flow transfer Road simultaneously judges whether trend is out-of-limit thereon, is of great significance to prevention circuit cascading trip.
The content of the invention
The purpose of the present invention is the deficiency for existing method, proposes a kind of tide based on multiple branch circuit excision and away from path Circulation moves recognizer, to be adapted to the identification that power flow transfer in the case of multiple branch circuit is cut off occurs, is reducing analysis calculation amount It effectively prevent transmission cross-section leakage at the same time and select problem.
In order to achieve the above object, the technical solution adopted by the present invention is：
A kind of power flow transfer recognizer based on multiple branch circuit excision and away from path, this method are cut off according to fault branch Power flow transfer feature afterwards, has analysed in depth the trend composition being transferred on non-fault line, secondly in certain node first Preceding K bars shortest path collection in depth between search excision two end node of branch, finally identifies what is had a great influence by power flow transfer Railway superstructures transmission cross-section.The present invention has made important in terms of the power flow transfer estimation, the selection of K values and section criterion of excision branch Improve, to be adapted to the identification that power flow transfer in the case of multiple branch circuit is cut off occurs；The value scheme of K a kind of has been re-established, and Shortest path collection is determined using away from routing algorithm, and transmission cross-section leakage choosing is effectively prevent while reducing and analyzing calculation amount and is asked Topic.The simulating, verifying of the IEEE30 node systems validity of inventive algorithm..
A kind of power flow transfer recognizer based on multiple branch circuit excision and away from path, the described method comprises the following steps：
Step 1：The trend composition being transferred on non-faulting branch is analyzed, when multiple branch circuit excision occurs, on branch k Transfer trend can regard as the folded of trend on branch k is transferred to after a plurality of branch using equivalent trend as initial trend is individually cut-off Add, multiple branch circuit excision is reduced to a plurality of single branch cuts off situation, avoids in direct current method and a large amount of of nodal impedance matrix are repaiied It is positive to calculate, and realize the quick estimation to power flow transfer；
Step 2：According to routing algorithm is deviated from graph search, excision two end node of branch is searched in certain node depth Between preceding K bars shortest path, determine the larger regional extent of power flow transfer.The power flow transfer that multiple branch circuit excision is combined in text is special Sign, re-establishes the value scheme of K a kind of, and takes and corrects the strategies of K values in search, avoid search range setting improper and The problem of branch is selected in leakage；
Step 3：Consider the real-time running state of power grid, give the selection principle of transmission cross-section, finally identify reality Trend increases larger branch collection, and can successfully find out the circuit that trend inversely increases.
As further describing, branch excision occurs in power grid if being mentioned in step 1, branch k is transferred to by excision branch l On tide flow (using initial direction of tide as just) branch breaking distribution factor Ds of the l to k can be passed throughk-lRepresent：
ΔPk=Dk-lPl
Wherein：PlTo cut off the initial effective power flow of branch l；ΔPkFor the trend being transferred on branch k.
From above formula, if the known distribution factor can calculate power flow transfer amount of the excision branch to any branch, and Dk-l It can be calculated by the nodal impedance matrix of system, its calculating formula is as follows：
Wherein：Xk-l、Xl-l、xk、xlIt is only related with the topological parameter of power grid.For a definite network, branch l is to appointing The distribution factor D of meaning branch kk-lDetermine therewith.
As further describing, step 2 is mentioned from circuit fundamental equation：When branch excision occurs, will can cut off Branch is distributed with the trend in the equivalent passive network after additional current sources (with the electric current equivalent before branch excision, reversely) replacement Carry out the power flow transfer of approximate excision branch.If searching for the most short closed path circuit of its preceding K bar to additional supply, these circuits bag Containing the transmission line of electricity that most electric currents in the equivalent network are larger, namely the branch being had a great influence by power flow transfer is contained, The feasibility of K critical path method (CPM)s search transmission cross-section before understanding in theory.
The regularity of distribution and single branch excision situation that trend is shifted when multiple branch circuit is cut off differ greatly, therefore need to set again Count the value scheme of K.
Further, mentioned in step 3 and accumulated the different preceding K shortest path firsts of many features at present, wherein deviating from Routing algorithm determines repairing for K values in its K articles shortest path, with the present invention away from path by ask for K-1 paths Positive process is consistent, and often derivation one need to only perform a Dijstra algorithm away from path, and the time complexity of algorithm is smaller, It is more easy to the requirement of real-time for meeting search.Summary advantage, uses in of the invention and is cut away from routing algorithm to multiple branch circuit occurs Except when influenced serious circuit by power flow transfer and be identified.
Compared with the conventional method, the beneficial effects of the invention are as follows：Route searching is introduced the tide of multiple branch circuit excision by the present invention Circulation is moved in recognizer, is a kind of new trial.Calculated by analyzing in the present invention, obtained while trend estimation formula is obtained Number of path to after being corrected, and then combine route searching and identify that trend increases larger branch with real-time running state.Institute Carrying algorithm has following features：Power flow transfer analysis module employs the thought of the limit, maintains the topological structure of initial network, Avoid modifying to nodal impedance matrix, greatly reduce matrix operation amount, improve efficiency of algorithm；Consider the first of transmission line of electricity Beginning trend, increases larger branch collection, acquired results are more in line with actual electric network operation so as to identify to obtain real-time trend Situation；Using the method for correcting K values in search, avoid the problem that search range sets improper and leaks and select branch；Give anti- The proportionality coefficient of trend stiffness of coupling is reflected, the value by calculating the coefficient can judge the serious journey of multiple branch circuit excision accident roughly Degree.
Brief description of the drawings
Fig. 1 is：The power flow transfer model of the multiple branch circuit excision of one embodiment of the invention.
Fig. 2 is：The power flow transfer analysis process figure of one embodiment of the invention.
Fig. 3 is：The route searching flow chart of one embodiment of the invention.
Fig. 4 is：The power flow transfer identification process figure of one embodiment of the invention.
Fig. 5 is：The IEEE30 node systems of one embodiment of the invention simplify topological diagram.
Embodiment
Technical scheme is described in further detail below by drawings and examples.
A kind of power flow transfer recognizer based on multiple branch circuit excision and away from path of the present invention, including following step Suddenly：
Step 1：The trend composition being transferred on non-faulting branch is analyzed, when multiple branch circuit excision occurs, on branch k Transfer trend can regard as the folded of trend on branch k is transferred to after a plurality of branch using equivalent trend as initial trend is individually cut-off Add, multiple branch circuit excision is reduced to a plurality of single branch cuts off situation, avoids in direct current method and a large amount of of nodal impedance matrix are repaiied It is positive to calculate, and realize the quick estimation to power flow transfer；
Assuming that initial trend difference PaWith PbBranch a, b break down excision, branch k be in network in addition to branch a, b Any one branch.Multiple branch circuit excision power flow transfer can be decomposed into the exhumation process back and forth of countless trends between excision branch. First, the initial trend of branch a, b is respectively according to distribution factor Dk-a、Dk-bIt is transferred on branch k, in addition PaAccording to distribution factor Db-aIt is transferred to branch b, PbAccording to distribution factor Da-bBranch a is transferred to, completes trend exchange process between a branch；Secondly, The trend exchanged between above-mentioned branch instead of the initial trend of excision branch, continue to shift network, and so on, until Trend is transferred completely into network on other branches, as shown in Figure 1, in figure：Represent that branch b n-ths are transferred on branch a Trend；Represent that branch a n-ths are transferred to the trend on branch b.
As shown in Figure 1：PaWithAccording to distribution factor Dk-aShifted to branch k, PbWithAccording to distribution factor Dk-b Shifted to branch k.The component that they are transferred on branch k adds up, you can obtains being transferred to total tide on branch k Flow and be：
It can be analyzed to following two parts：
1)PbWhen=0
There is following relational expression at this time：
It can be derived from by upper two formula：
2)PaWhen=0
There is following relational expression at this time：
Pushed away by upper two formula：
Final two formula derived in two parts superposition can be tried to achieve into trendFor：
It can similarly obtainFor：
Upper two formula, which is substituted into first formula, to be obtained：
ΔPk=Dk-aP′a+Dk-bP′b
Wherein：P′a、P′bThe respectively equivalent trend of branch a, b, its meaning：, can after equivalent trend is substituted initial trend To eliminate the trend coupled relation cut-off between branch, so as to directly carry out power flow transfer to branch k.From above-mentioned derivation, when After broken string branch determines, P 'aWith P 'bIt can be calculated by primary condition.
It can be obtained by last formula：When generation multiple branch circuit is cut off, the transfer trend on branch k can regard a plurality of with equivalent as Trend is transferred to the superposition of trend on branch k after individually being cut-off for the branch of initial trend, multiple branch circuit excision is reduced to a plurality of Single branch cuts off situation, avoids to a large amount of corrected Calculations of nodal impedance matrix in direct current method, and realize to power flow transfer Quick estimation.
Step 2：According to routing algorithm is deviated from graph search, excision two end node of branch is searched in certain node depth Between preceding K bars shortest path, determine the larger regional extent of power flow transfer.The power flow transfer that multiple branch circuit excision is combined in text is special Sign, re-establishes the value scheme of K a kind of, and takes and corrects the strategies of K values in search, avoid search range setting improper and The problem of branch is selected in leakage；
The regularity of distribution and single branch excision situation that trend is shifted when multiple branch circuit is cut off differ greatly, therefore need to set again Count the value scheme of K.The trend for being transferred to branch k is independent two parts：A part is the equivalent trend P ' of branch aaTransfer Component Δ P on to branch kk1；Another part is the equivalent trend P ' of branch bbThe component Δ P being transferred on branch kk2。
ΔPk=Δ Pk1+ΔPk2=Dk-aP′a+Dk-bP′b
The value scheme used herein：First by Δ Pk1Determine the elementary path number K of branch aa, next Δ Pk2As auxiliary Criterion is helped, corrects KaValue, by the K after being correctedaRequired number of path as branch a.Its step is as follows：
Step 1：Determine elementary path number Ka
ΔPk1It is the trend that branch a directly shifts branch k, the transfer trend of single spur track excision occurs with branch a The regularity of distribution is consistent, can be analogous to K value acquiring methods during single spur track excision：
Wherein：β is the threshold value of power flow transfer coefficient, considers the efficiency of algorithm, generally takes 0.3.
At this time, branch a is with equivalent trend P 'aInstead of its initial trend Pa.The trend being then transferred on remaining branch is branch P ' when road a is individually cut-offa/PaTimes, make A=P 'a/Pa, then KaIt should meet：
It can be obtained with reference to upper two formula：
Ka=| [- AK] |
Wherein [] operator representation is no more than the smallest positive integral in bracket.
Step 2：Correct Ka
From shortest path, K before removingaOutside bar shortest path, the K that is transferred between two end nodes of branch aa+ 1 most Trend on short path is the maximum in remaining shortest path.Therefore, only K need to be judgedaAdd and divide in+1 shortest path Measure Δ Pk2Afterwards, shift whether trend is out-of-limit, and makeover process is as described below thereon：
1. search for Ka+ 1 shortest path.
2. find out in the path with preceding KaThe not associated railway superstructures of paths increase sets of lines newly, calculate in newly-increased sets of lines Power flow transfer coefficient delta Ps of any circuit t to branch at/PaIf meeting following formula, K is madea=Ka+1。
Wherein Δ PtFor the tide flow being transferred on branch t, ε is the upper limit coefficient of power flow transfer coefficient.As Δ Pt/PaGreatly When ε, illustrate Δ Pk2Account for Δ PtLarge percentage, if i.e. branch t have bigger probability be included in two end nodes of branch b between it is preceding In dry bar shortest path, in order to avoid repeat search, therefore K is not correcteda.By a large amount of simulating, verifyings, as ε=0.5, Neng Gouyou Effect suppresses KaIncrease and search result include all branches being had a great influence by power flow transfer.
3. repeat 1. 2. until KaThe newly-increased circuit of above formula is not met on+1 shortest path.
The number of path K of branch b can similarly be obtainedbValue.
Summary improvement project：Consider multiple branch circuit excision power flow transfer feature, and the reasonably K when single spur track is cut off It is improved on the basis of value selection principle, it is easy to accomplish；All parameters can be tried to achieve by primary condition, illustrate that this programme can OK；General A values are not too large, meet rapidity requirement.
Step 3：Consider the real-time running state of power grid, give the selection principle of transmission cross-section, finally identify reality Trend increases larger branch collection, and can successfully find out the circuit that trend inversely increases.
Recognizer flow is designed according to following modularizations：
1) power flow transfer analysis module
The function of the module is to provide network topology structure with cutting off the equivalent trend of branch, is provided initially for route searching Data, its flow are as shown in Figure 2.
2) path searcher module
The function of the module is some shortest paths between search excision two end node of branch, to being cut off tide by multiple branch circuit Circulation moves the region having a great influence and is bound.Since the element being had a great influence in power grid by power flow transfer is no more than the whole network 20%, so the whole network analysis need not be carried out, it need to only be scanned in certain node depth T, and then improve algorithm Efficiency, search routine are as shown in Figure 3.
3) power flow transfer identification module
The functions of modules is the real-time running state with reference to power grid, identifies the line that the actual increase of trend is larger in path set Road；The circuit that power flow increment is more than to a certain particular value adds transmission cross-section.
ΔPk.0＞ γ Pi.min
Wherein：ΔPk.0For the power flow increment of branch k；Pi.minFor minimum excision Branch Power Flow；γ is active increase coefficient Threshold value, takes 0.3 herein.
However, there are two kinds of situations for the actual larger transmission line of electricity of increase of trend in power grid：1) shift thereon trend with it is initial Direction of tide is consistent；2) it is opposite with initial direction of tide that trend is shifted thereon.For different situations, the power flow increment on circuit is Different.
For situation 1：Power flow increment on circuit is as transferred to tide flow thereon, i.e. Δ Pk.0=Δ Pk.In substitution Formula can obtain the criterion of transmission cross-section：
ΔPk＞ γ Pi.min
For situation 2：It is transferred to the trend Δ P of circuitk＜ 0, only reacts trend and reduces, in order to react power flow increment, Give in this case trend increased criterion：
|ΔPk|-2Pk＞ 0
Wherein PkFor the initial trend of branch k.
Line Flow incrementss Δ P at this timek.0=| Δ Pk|-2Pk, bringing first formula into can obtain：
|ΔPk|-2Pk＞ γ Pi.min
Therefore, the flow scheme design of the module is as shown in Figure 4.
Simulating, verifying is carried out to IEEE30 node systems, it is impossible to generator and load section with railway superstructures closed circuit Point is rejected from network, and obtained system simplifies topology as shown in Figure 5.It is relatively conservative estimation that K, which is equal to 4, and general the K articles most The power flow transfer coefficient of newly-increased branch in short path does not reach 1/K.Therefore, a reference value K takes 3 knowledges for not interfering with power flow transfer Other result.
Example 1：It is respectively L to cut-off branch a, b18-19With L16-17.It is computed the equivalent trend P ' of rear branch aa=4.59MW, A=1.51, elementary path number Ka=| [- AK] |=5；K can similarly be obtainedb=5.Route searching data are as shown in table 1, table 2.
Elementary path number is 5 in table 1, branch L newly occurs in the 6th paths6-10Power flow transfer coefficient be 0.48, it is full Foot constraint, illustrates L16-17Equivalent power flow transfer to L6-10Component cause its power flow transfer coefficient to exceed threshold value, then to KaInto Row is corrected；The 7th paths are continued search for, but increase branch L in the 7th paths newly4-2With L2-6Power flow transfer coefficient be respectively 0.13 and 0.14, it is unsatisfactory for constraining, it is not necessary to correct Ka.Similarly K in table 2bMakeover process it is similar with table 1, after being finally corrected Ka=6, Kb=5.
Circuit in path set is identified according to section selection principle, the results are shown in Table 3 for it.
Example 2：It is respectively L to cut-off branch a, b28-27With L12-15, it is computed the equivalent trend P ' of rear branch aa= 18.38MW, A=1.10, elementary path number Ka=| [- AK] |=4；K can similarly be obtainedb=4.Route searching result and recognition result As shown in table 4, table 5 and table 6.
From result, 10, the larger circuit of 15 power flow increments are searched in example 1, example 2 respectively, compared to Active incrementss obtained by accurate Load flow calculation, illustrate that the present invention can have the tidal current computing method being transferred on non-faulting branch The active value added of reality of the approximate circuit in effect ground, to determine whether circuit overloads offer in transmission cross-section after branch excision Reference frame.And the branch that trend inversely increases effectively is found out, such as circuit L in table 621-22With L25-27。
Comparative analysis example 1 and example 2：Trend in example 1 is can be seen that from the ratio A of equivalent trend and initial trend Between stiffness of coupling it is even more serious compared to for example 2, cause example 1 be corrected after number of path be more than example 2 numerical value. In extreme circumstances, it is L such as to cut-off circuit15-23With L27-29When, the distribution factor of cut-offfing cut off between circuit is 0, ratio A=1, Then cut-offfing between trend does not have coupled relation, and it is consistent to shift at this time when the distribution of trend in a network is cut off with single spur track.Cause This, coefficient A can reflect the trend stiffness of coupling between the branch and other broken string branches, and can further prejudge this excision thing Therefore the order of severity.A values closer 1, the distribution of trend in a network of cut-offfing for cutting off branch cut off situation closer to single spur track, As A values increase, it cut-offs the distribution of trend and difference during single spur track excision situation is also bigger, and accident is also more serious.
Table 1 is one embodiment of the invention to L18-19Route searching data.
Table 2 is one embodiment of the invention to L16-17Route searching data.
Table 3 is the L of one embodiment of the invention18-19And L16-17The recognition result of excision accident.
Table 4 is one embodiment of the invention to L28-27Route searching data.
Table 5 is one embodiment of the invention to L12-15Route searching data.
Table 6 is the L of one embodiment of the invention28-27And L12-15The recognition result of excision accident.
Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Understand from the above, route searching is introduced into the power flow transfer recognizer of multiple branch circuit excision by the present invention, is A kind of new trial.Calculated in the present invention by analyzing, the number of path after being corrected while trend estimation formula is obtained, And then combine route searching and identify that trend increases larger branch with real-time running state.Carried algorithm has following features： Power flow transfer analysis module employs the thought of the limit, maintains the topological structure of initial network, avoids to nodal impedance matrix Modify, greatly reduce matrix operation amount, improve efficiency of algorithm；The initial trend of transmission line of electricity is considered, so as to know Not obtaining real-time trend increases larger branch collection, and acquired results are more in line with actual electric network operating condition；Using in search The method for correcting K values, avoids the problem that search range sets improper and leaks and select branch；Give the ratio of reflection trend stiffness of coupling Example coefficient, the value by calculating the coefficient can judge the order of severity of multiple branch circuit excision accident roughly.

Claims (3)

  1. A kind of 1. power flow transfer recognizer based on multiple branch circuit excision and away from path, it is characterised in that：The described method includes Following steps：
    I, the trend composition being transferred on non-faulting branch is analyzed, when multiple branch circuit excision occurs, the transfer tide on branch k Stream can regard the superposition that trend on branch k is transferred to after a plurality of branch using equivalent trend as initial trend is individually cut-off as, will be more Branch excision is reduced to a plurality of single branch excision situation, avoids in direct current method to a large amount of corrected Calculations of nodal impedance matrix, And realize the quick estimation to power flow transfer；
    Deviate from routing algorithm in II, foundation graph search, the preceding K in certain node depth between search excision two end node of branch Bar shortest path, determines the larger regional extent of power flow transfer.The power flow transfer feature of multiple branch circuit excision is combined in text, again The value scheme of K a kind of is established, and takes the strategy that K values are corrected in search, avoids search range from setting improper and leak choosing branch The problem of road；
    III, the real-time running state for considering power grid, give the selection principle of transmission cross-section, finally identify that actual trend increases Add larger branch collection, and can successfully find out the circuit that trend inversely increases.
  2. 2. based on a kind of power flow transfer recognizer based on multiple branch circuit excision and away from path described in claim 1, it is special Sign is：Described in step I equivalent trend is substituted into initial trend after, the trend coupled relation cut-off between branch can be eliminated, So as to directly carry out power flow transfer to branch k；When generation multiple branch circuit is cut off, the transfer trend on branch k can regard as it is a plurality of with etc. Effect trend is transferred to the superposition of trend on branch k after individually being cut-off for the branch of initial trend, multiple branch circuit excision is reduced to more The single branch excision situation of bar, avoids to a large amount of corrected Calculations of nodal impedance matrix in direct current method, and realize and trend is turned The quick estimation moved.
  3. 3. based on a kind of power flow transfer recognizer based on multiple branch circuit excision and away from path described in claim 1, it is special Sign is：Multiple branch circuit described in step II shifts the regularity of distribution of trend when cutting off and single branch excision situation differs greatly, Therefore the value scheme of K need to be redesigned；Improvement project considers multiple branch circuit excision power flow transfer feature, and reasonably in single branch It is improved when road is cut off on the basis of K value selection principles, it is easy to accomplish；All parameters can be tried to achieve by primary condition, be said Bright the present invention program is feasible.
CN201610894008.6A 2016-10-14 2016-10-14 A kind of power flow transfer recognizer based on multiple branch circuit excision and away from path Pending CN107959284A (en)

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* Cited by examiner, † Cited by third party
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CN109375050A (en) * 2018-08-22 2019-02-22 山东科技大学 A kind of electric system key sections discrimination method based on primary fault route cut set
CN109638845A (en) * 2018-12-26 2019-04-16 浙江大学 Transmission line of electricity switching assembled scheme method for building up and device
CN109638836A (en) * 2018-12-04 2019-04-16 国网浙江省电力有限公司衢州供电公司 A kind of reversed abnormal automatic fitration method of trend
CN110542791A (en) * 2019-09-06 2019-12-06 福建工程学院 limit power calculation method for initial fault branch during power grid cascading trip
CN114172155A (en) * 2021-12-07 2022-03-11 中国电力科学研究院有限公司 Multi-fault-break load flow calculation method, system, equipment and storage medium

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109375050A (en) * 2018-08-22 2019-02-22 山东科技大学 A kind of electric system key sections discrimination method based on primary fault route cut set
CN109638836A (en) * 2018-12-04 2019-04-16 国网浙江省电力有限公司衢州供电公司 A kind of reversed abnormal automatic fitration method of trend
CN109638845A (en) * 2018-12-26 2019-04-16 浙江大学 Transmission line of electricity switching assembled scheme method for building up and device
CN110542791A (en) * 2019-09-06 2019-12-06 福建工程学院 limit power calculation method for initial fault branch during power grid cascading trip
CN114172155A (en) * 2021-12-07 2022-03-11 中国电力科学研究院有限公司 Multi-fault-break load flow calculation method, system, equipment and storage medium

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