CN106329517B - Electromagnetic looped network based on longitude and latitude thread path unlinks analysis method automatically - Google Patents
Electromagnetic looped network based on longitude and latitude thread path unlinks analysis method automatically Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
It unlinks automatically analysis method the invention discloses a kind of electromagnetic looped network based on longitude and latitude thread path, including：Step S1, obtains the composition form of electromagnetic looped network, and the composition form is the number of the number and 500kV/220kV electromagnetic looped networks of 500kV substations；Step S2 formulates preliminary partition scheme to obtain electromagnetic looped network to be unlinked according to the composition form of electromagnetic looped network；Step S3 finds the longitude and latitude thread path of electromagnetic looped network to be unlinked；Step S4 finds the broken string set of electromagnetic looped network to be unlinked；Step S5 formulates preliminary uncoupling loop scheme；Step S6 filters out optimal uncoupling loop scheme from the preliminary uncoupling loop scheme.Electromagnetic looped network provided by the invention based on longitude and latitude thread path unlinks analysis method automatically, realizes not only pratical and feasible but also thorough search purpose, avoids artificial a large amount of calculating and analyzes work.
Description
Technical field
The present invention relates to the technical fields of electricity net safety stable analysis and control, and in particular to one kind being based on longitude and latitude thread path
Electromagnetic looped network unlink automatically analysis method.
Background technology
With the operation of the new construction and its mating 220kV line projects of 500kV substations, two or more 500kV
Not only it is connected by 500kV circuits between standing, but also together by 220kV connections, just forms 500kV/220kV electricity in this way
Magnet ring net.Initial stage is formed in electromagnetic looped network, improves the power supply reliability and power supply capacity of 220kV area power grids, while power grid
Short circuit current is less than switch rupturing capacity, plays an important roll to improving power grid power supply capacity.With electromagnetic looped network structural strengthening,
Area power grid power supply capacity and power supply level fast lifting, but grid short circuit levels of current approaches even more than switch blocking simultaneously
Capacity, it has also become an important factor for restricting power network development and threatening electric power netting safe running needs the reduction for formulating reasonable short
Road electric current measure.
The measure for reducing short circuit current has very much, and common measure has broken string road, denominator line, string reactance etc., and application is most general
Time measure be broken string road, that is, realize that electromagnetic looped network unlinks, power system delamination and subarea operation, such grid structure is clear, safety is steady
Qualitative height is the inexorable trend of power network development.Complex area power grid contains multiple stations 500kV and multiple 500kV/220kV electromagnetism
Looped network, feasible electromagnetic looped network uncoupling loop scheme and reduction short circuit current measure have very much, formulate reasonable, economic, feasible unlink
Scheme and measure often spend a large amount of manpower and time, work out measures not only need to consider to reduce short circuit current level effect,
Security analysis, voltage stability and transient stability, artificial calculating analysis is time-consuming and laborious, especially for planning power grid, electricity
It is many to net the uncertain factor built, needs to consider a variety of electric network compositions and uncoupling loop scheme.
Currently, unlinking analysis field in electromagnetic looped network, there is scholar to propose to be based on GN splitting algorithms and corporations' network characteristic shape
At the partition scheme of electromagnetic looped network, can in automatic Network Search electrical link weakness circuit, as the open-circuit line that unlinks,
Belong to a kind of intelligent algorithm, but this method is difficult to realize the search of the whole feasible uncoupling loop scheme of power grid according to network characterization, it can
Can occur omitting situation.
Invention content
To be solved by this invention is that the existing electromagnetic looped network method of unlinking is susceptible to asking for feasible uncoupling loop scheme omission
Topic.
The present invention is achieved through the following technical solutions：
A kind of electromagnetic looped network based on longitude and latitude thread path unlinks analysis method automatically, including：Step S1 obtains electromagnetic looped network
Composition form, the composition form be 500kV substations number and 500kV/220kV electromagnetic looped networks number；Step S2,
Preliminary partition scheme is formulated to obtain electromagnetic looped network to be unlinked according to the composition form of electromagnetic looped network；Step S3 finds and waits solving
The longitude and latitude thread path of the electromagnetic looped network of ring；Step S4 finds the broken string set of electromagnetic looped network to be unlinked；Step S5 is formulated just
Walk uncoupling loop scheme；Step S6 filters out optimal uncoupling loop scheme from the preliminary uncoupling loop scheme.
Electromagnetic looped network provided by the invention based on longitude and latitude thread path unlinks analysis method automatically, and the structure based on power grid is special
Sign forms warp path and weft path, realizes that the search automatic in all directions of feasible measure of unlinking, the scheme of formulation meet reality
Using and conventional thinking of unlinking, function that is not only pratical and feasible but also realizing thorough search.
Optionally, the preliminary partition scheme be breaking part 220kV circuits after realize fragment area of 220kV substations by
The power grid connection type of 500kV substations power supply.
Optionally, for the 500kV substations with two main transformers, the 500kV substations and adjacent 500kV substations
Electromagnetic looped network Electromagnetic coupling；For the 500kV substations with three and three or more main transformers, the 500kV substations and phase
Adjacent 500kV substations electromagnetic looped network solution inscription of loop, or in the case where short circuit current is not exceeded with adjacent 500kV substations electricity
Magnet ring network closed loop is run；The foundation of the 500kV substations maximum quantity of electromagnetic looped network Electromagnetic coupling is that three short circuit current does not surpass
Mark, three 500kV substations if electromagnetic looped network Electromagnetic coupling occur considering denominator operation measures if three short circuit current is exceeded,
Occur reducing electromagnetism ring if three short circuit current is exceeded if four of electromagnetic looped network Electromagnetic coupling and four or more 500kV substations
The 500kV substations quantity of network closed loop operation；For the complicated electromagnetism ring being made of three and three or more 500kV substations
Net, if wherein Liang Zuo 500kV substations keep electromagnetic looped network Electromagnetic coupling, a remaining 500kV substation that should have three
The main transformer of platform and three or more can be connected with other 500kV substations.
Optionally, the longitude and latitude thread path is made of 220kV circuits, two 500kV power transformations for connecting electromagnetic looped network
It stands.
Optionally, the longitude and latitude thread path for finding electromagnetic looped network to be unlinked carries out in the following manner：It finds in electromagnetic looped network
When warp path between Liang Zuo 500kV substations, cannot occur passing through other 500kV substations first twice or more than twice
The connected 220kV substations of grade, and cannot pass through the 500kV substations originated；It is answered for what is be made of three 500kV substations
Miscellaneous electromagnetic looped network, if wherein Liang Zuo 500kV substations electromagnetic looped network Electromagnetic coupling, another 500kV substation it is independent or and its
His 500kV substations cooperation then formulates the longitude and latitude circuit of another 500kV substation and wherein Liang Zuo 500kV substations
Diameter；Find full weft and sub- weft.
Optionally, the broken string set is made of 220kV circuits, for realizing electromagnetic looped network solution inscription of loop.
Optionally, the broken string set for finding electromagnetic looped network to be unlinked carries out in the following manner：Weft path is not turned off, only
Disconnect warp path；Realize that warp path disconnects using minimum broken string quantity；Broken string set cannot be entirely that same seat 500kV becomes
The first order circuit in power station；It is excellent for the series-fed mode warp path being made of two or two or more 500kV substations
First consider the middle line of disconnection statements based on collusion formula structure；When two or more full weft has identical part weft, then solely
It is vertical to consider the full weft of each.
Optionally, the uncoupling loop scheme refers to the scheme that partition running is realized by specific 220kV open-circuit lines.
Optionally, formulating preliminary uncoupling loop scheme includes：Various broken string set situations under each preliminary partition scheme of matching
To obtain the various uncoupling loop schemes under each partition scheme；It is preliminary to obtain to summarize the various uncoupling loop schemes under each partition scheme
Uncoupling loop scheme.
Optionally, filtering out optimal uncoupling loop scheme from the preliminary uncoupling loop scheme includes：Formulate level-one evaluation index and
Two-level appraisement index, the level-one evaluation index are K1=KI×KP, the two-level appraisement index K2=KI×KP×KT, wherein K1
For the level-one evaluation index, K2For the two-level appraisement index, KIIt is abundant for busbar short-circuit electric current minimum in power grid after unlinking
Degree, KPFor the product of the power supply capacity of each section of power grid after unlinking, the power supply capacity of each section of power grid is section after unlinking
The absolute value of the difference of maximum supply load and section reference load is than upper section reference load, KTFor each section of power grid after unlinking
Main transformer carry the product for holding ratio, the main transformer of each section of power grid, which carries, after unlinking holds than being section maximum supply load and section main transformer
The ratio of total capacity；The maximum side of unlinking of level-one evaluation index value is filtered out from the various uncoupling loop schemes under each partition scheme
Case is as optimal uncoupling loop scheme；If the first class index value of two kinds of uncoupling loop schemes is identical under same partition scheme, from same subregion
The maximum uncoupling loop scheme of two-level appraisement index value is filtered out under scheme in two kinds of uncoupling loop schemes as optimal uncoupling loop scheme.
Evaluation index provided by the invention takes into account short circuit current level and power supply capacity nargin, realizes that electromagnetic looped network unlinks
The accurate, comprehensive of scheme, thoroughly evaluating provide advantageous tool and condition for the assessment screening of uncoupling loop scheme.
Compared with prior art, the present invention having the following advantages and advantages：
Electromagnetic looped network provided by the invention based on longitude and latitude thread path unlinks analysis method automatically, is suitable for automatic formulating ground
Various unlink measure and the uncoupling loop schemes of area's power grid 500kV/220kV electromagnetic looped networks realize searching in all directions for feasible measure of unlinking
Rope, the scheme formulated automatically meet practical application and conventional thinking of unlinking, realize not only pratical and feasible but also thorough search purpose, keep away
Artificial a large amount of calculating and analysis work are exempted from.
Description of the drawings
Attached drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 be the embodiment of the present invention the electromagnetic looped network based on longitude and latitude thread path unlink automatically analysis method flow signal
Figure；
Fig. 2 is the structural schematic diagram of the area power grid of the embodiment of the present invention；
Fig. 3 is the simplification figure of the area power grid of the embodiment of the present invention.
Specific implementation mode
First, the explanation of technical terms that the embodiment of the present invention uses is as follows：
Electromagnetic looped network：The circuit of different voltages grade operation, the simultaneously through transport by connection of both ends transformer electromagnetic circuit
Row；Simple electromagnetic looped network：The electromagnetic looped network being made of Liang Zuo 500kV substations；Complicated electromagnetic looped network：By three or three or more
The electromagnetic looped network that 500kV substations are formed between each other；Line route：By some 220kV lines of 500kV/220kV electromagnetic looped networks
Road forms, the Liang Zuo 500kV substations that can be connected to by these circuits in the electromagnetic looped network；Warp path：It is all to be connected to
The 220kV line routes of electromagnetic looped network Zhong Liangzuo 500kV substations；Weft circuit：It can lateral connection difference warp path
220kV circuits；Weft path：It is made of connected weft circuit, including full weft path and sub- weft path；Full weft road
Diameter：The weft circuit formed is connected with all warp paths；Sub- weft path：The weft circuit formed and part via line
Diameter is connected.
Fig. 1 is that the electromagnetic looped network based on longitude and latitude thread path of the present embodiment unlinks the flow diagram of analysis method automatically,
The electromagnetic looped network based on longitude and latitude thread path analysis method of unlinking automatically includes step S1~step S6.
Step S1 obtains the composition form of electromagnetic looped network.For the grid structure of research power grid, simplify grid structure first
Figure, forms the electrical structure diagram of one-line format, then pick out the number of 500kV substations and 500kV/220kV electromagnetic looped networks,
The number of 500kV substations and the number of 500kV/220kV electromagnetic looped networks are the composition form.Actual electric network not only has two
The simple electromagnetic looped network that seat 500kV substations are constituted, it is also possible to which there are the complexity that three or three or more 500kV substations are constituted
Electromagnetic looped network.
Step S2 formulates preliminary partition scheme to obtain electromagnetic looped network to be unlinked according to the composition form of electromagnetic looped network.
The preliminary partition scheme is powered for fragment area of realization 220kV substations after breaking part 220kV circuits by 500kV substations
Power grid connection type.According to features such as the power supply capacity of actual electric network and short circuit current levels, formulate preliminary partition scheme by with
Under type carries out：
For the 500kV substations with two main transformers, which is unable to independent operating, the 500kV substations with it is adjacent
500kV substations electromagnetic looped network Electromagnetic coupling；
For the 500kV substations with three and three or more main transformers, which can be become with independent operating, the 500kV
Power station and adjacent 500kV substations electromagnetic looped network solution inscription of loop, or in the case where short circuit current is not exceeded with adjacent 500kV
Substation's electromagnetic looped network Electromagnetic coupling.
The foundation of the 500kV substations maximum quantity of electromagnetic looped network Electromagnetic coupling is that three short circuit current is not exceeded, if electric
It is exceeded that three short circuit current occur in three 500kV substations of magnet ring network closed loop operation, denominator operation measures is considered, if electromagnetism
It is exceeded that three short circuit current occur in four of looped network Electromagnetic coupling and four or more 500kV substations, reduces electromagnetic looped network cyclization
The 500kV substations quantity of operation；
Above-mentioned three kinds of modes are for the simple electromagnetic looped network being made of Liang Zuo 500kV substations, for by three and three
Or more 500kV substations constitute complicated electromagnetic looped network, not only need to meet above-mentioned three kinds of modes, it is also necessary to：If wherein two
Seat 500kV substations keep electromagnetic looped network Electromagnetic coupling, then a remaining 500kV substation should have three and three or more
Main transformer or can be connected with other 500kV substations, that is, have independent operating or with other substation's electromagnetic looped network cyclizations
The condition of operation.
The formulation of above-mentioned preliminary partition scheme addresses only unlinking and cyclization problem for electromagnetic looped network, however partition scheme
Final purpose is not only to solve short circuit current excessive problem also to take into account power grid power supply capacity.Therefore, electromagnetic looped network unlink with
In cyclization measure, if certain 500kV substations 220kV busbar three short circuit currents are still exceeded, it may be considered that busbar denominator is run
Measure, but do not allow to take breaking part circuit to weaken the reduction short circuit current measure of electromagnetism power grid electrical link；If 500kV
Substation 220kV busbar single-phase short circuit currents are exceeded, need to consider that neutral point of main transformer installs low reactance measure additional, to be reduced
The aggregate measures of electromagnetic looped network short circuit current.
Step S3 finds the longitude and latitude thread path of electromagnetic looped network to be unlinked.For the electromagnetic looped network for needing solution inscription of loop, need
Find the longitude and latitude thread path of electromagnetic looped network between 500kV substations.The longitude and latitude thread path is made of 220kV circuits, for connecting
Meet the Liang Zuo 500kV substations of electromagnetic looped network.The longitude and latitude thread path for finding electromagnetic looped network to be unlinked carries out in the following manner：
When finding the warp path between electromagnetic looped network Zhong Liangzuo 500kV substations, cannot occur twice or more than twice
By the 220kV substations that other 500kV substations first order are connected, and it cannot pass through the 500kV substations originated.Specifically
Ground, for the simple electromagnetic looped network being made of Liang Zuo 500kV substations, from the 220kV busbares of a 500kV substation,
For Automatic-searching to all 220kV line routes of another 500kV substation, these paths are known as warp path.Mark composition
The 220kV circuit directions of search of every warp path, then find in the traversed 220kV circuits of all warp paths that there are two-way
These circuits are denoted as weft circuit by the circuit of the direction of search, by connected weft railway superstructures weft path.If all warps
The substation of certain weft path is all passed through in path, then the weft path is known as full weft path, otherwise referred to as sub- weft path.It can
See, warp path is to be directly connected to the path of Liang Zuo 500kV substations, and weft path is across the path of warp, plays and takes
The connection function of bridge construction beam.
For the complicated electromagnetic looped network being made of three 500kV substations, if wherein Liang Zuo 500kV substations electromagnetic looped network
Electromagnetic coupling, another 500kV substation it is independent or with other 500kV substations cooperations, then formulate another 500kV and become
The longitude and latitude thread path in power station and wherein Liang Zuo 500kV substations.Such as the complicated electromagnetism that tri- 500kV substations of A, B and C are constituted
Looped network, if AB Electromagnetic couplings, C it is independent or with other 500kV substations cooperations, then need the longitude and latitude circuit for formulating C and AB
Diameter forms the longitude and latitude thread path between AB, later from the 220kV busbares of C, by AB with reference first to simple electromagnetic looped network situation
Between all stations in longitude and latitude thread path all as a purpose, search for forward to any of latitude and longitude substation between AB, form warp
Thread path, the formation principle of weft path is the same as simple electromagnetic looped network.For what is be made of four and four or more 500kV substations
Complicated electromagnetic looped network is formulated longitude and latitude thread path and is same as above.
Find full weft and sub- weft.Specifically, it finds belonging to full weft i.e. all traversed weft of whole line routes
Substation；It finds sub- weft i.e. part circuit traversal path and crosses substation belonging to the weft.In this way, completing electromagnetic looped network
All latitude and longitude path finding search works.
Step S4 finds the broken string set of electromagnetic looped network to be unlinked.The broken string set is made of 220kV circuits,
For realizing electromagnetic looped network solution inscription of loop.For the 220kV electrical links for disconnecting in electromagnetic looped network between 500kV substations, should disconnect
All warp paths, the whole circuits disconnected are known as a broken string set.
According to looped network with the presence or absence of full weft path, sub- weft path, it is total to be divided into only full weft, full weft and sub- weft
Have, only sub- weft and without four kinds of situations of weft.If only full weft, path is divided into several sections according to full weft, from every section
The railway superstructures broken string set of the middle whole warps of selection；If full weft and sub- weft are shared, first path is drawn according to full weft
It is divided into several sections, for the railway superstructures broken string set for there is no the section of sub- weft, directly selecting whole warps, for there is sub- weft
Section, segment out incomplete section of layer further according to sub- weft, broken string selected from each subsegment, while being not attached to from sub- weft
Warp path in select broken string, in conjunction with both broken string constitute broken string set；If only sub- weft, separates according to sub- weft
Incomplete section, broken string is selected from each subsegment, while broken string is selected from the disjunct warp path of sub- weft, in conjunction with
Both broken strings constitute broken string set；If without weft path, broken string is selected from each path, is constituted various feasible disconnected
Line set.
After forming longitude and latitude thread path, the broken string set for finding electromagnetic looped network to be unlinked carries out in the following manner：It does not turn off
Weft path only disconnects warp path；The thinking of passage path cluster realizes that warp path disconnects using minimum broken string quantity,
It disconnects weakest link, retain the circuit pack being closely connected；Broken string set cannot be entirely same seat 500kV substations
First order circuit；For the series-fed mode warp path being made of two or two or more 500kV substations, pay the utmost attention to
Disconnect the middle line of statements based on collusion formula structure；When two or more full weft has identical part weft, then independence considers
The full weft of each.
Step S5 formulates preliminary uncoupling loop scheme.The uncoupling loop scheme refers to realizing to divide by specific 220kV open-circuit lines
The scheme of area's operation, formulating preliminary uncoupling loop scheme includes：Various broken string set situations under each preliminary partition scheme of matching with
Obtain the various uncoupling loop schemes under each partition scheme；Summarize the various uncoupling loop schemes under each partition scheme to obtain preliminary solution
Ring scheme.
Step S6 filters out optimal uncoupling loop scheme from the preliminary uncoupling loop scheme.In the present embodiment, from described preliminary
Optimal uncoupling loop scheme is filtered out in uncoupling loop scheme includes：Formulate level-one evaluation index and two-level appraisement index；From each square partition
The maximum uncoupling loop scheme of level-one evaluation index value is filtered out in various uncoupling loop schemes under case as optimal uncoupling loop scheme；If same
The first class index value of two kinds of uncoupling loop schemes is identical under partition scheme, then from being filtered out in two kinds of uncoupling loop schemes under same partition scheme
The maximum uncoupling loop scheme of two-level appraisement index value is as optimal uncoupling loop scheme.
Specifically, short circuit current index definition is busbar short-circuit current margins minimum in power grid after unlinking, i.e.,Wherein, KIFor busbar short-circuit electricity minimum in power grid after unlinking
Flow nargin, INiFor the rupturing capacity of i-th of 500kV substation breakers, IdiFor the short circuit electricity of i-th of 500kV substation bus bar
Stream, M are the quantity of 500kV substations, 1≤i≤M.
The power supply capacity of each section of power grid is defined as the difference of section maximum supply load and section reference load after unlinking
Absolute value than upper section reference load, it is assumed that power grid is divided into three sections after unlinking, and the reference load of power grid is PS, three pieces
The reference load in area is respectively P1N、P2NAnd P3N, three section maximum supply loads are respectively P1、P2And P3, then the whole network
Power supply capacity index isWherein, KPFor the confession of each section of power grid after unlinking
The product of electric energy power.Collect short circuit current index and power supply capacity index, show that the level-one of assessment electromagnetic looped network uncoupling loop scheme is commented
Valence index, is defined as K1=KI×KP。
The main transformer of each section of power grid carries appearance ratio and is defined as section maximum supply load and section main transformer total capacity after unlinking
Ratio, which reflects the utilization rate of main transformer：Value is bigger, then the utilization rate of main transformer is higher.Assuming that power grid is divided into three after unlinking
A section, three section maximum supply loads are respectively P1、P2And P3, the main transformer total capacity of three sections is respectively S1、S2With
And S3, then the product of the main transformer load appearance ratio of each section of power grid is after unlinkingDue to different subregions scheme
Number of partitions it is different, therefore the main transformer of different subregions scheme carries and holds ratio and cannot be compared, under only same partition scheme
Different uncoupling loop schemes can compare the index, thus the two-level appraisement index K of definition assessment electromagnetic looped network uncoupling loop scheme2=KI×
KP×KT。
To make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiment and attached drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment
Fig. 2 is the structural schematic diagram of the area power grid of the embodiment of the present invention, wherein only there are three main transformers in A substations, other
Substation only has two main transformers.For specified research power grid, no matter power grid is by one or multiple electric companies of districts and cities electricity
Net composition, forms the full wired network figure of power grid, i.e., the circuit disconnected by the reasons such as overhaul, trip puts into operation, but and its
The unlink circuit of disconnection of his ground utility grid remains off.For full wired network figure, will be connected by double back or three loop line roads
The two 220kV substations connect are changed to single back line connection, form simplified network shown in Fig. 3.
The simple electromagnetic looped network that Pan Chuliangzuo 500kV substations are constituted first, judges whether three on this basis
The complicated electromagnetic looped network that 500kV substations are constituted between each other, and whether there is four even more power transformations of 500kV substations
It stands the complicated electromagnetic looped network constituted between each other, and records one by one.In conjunction with Fig. 3 it is found that there are a Ge Liangzuo 500kV substations structures
At electromagnetic looped network, Liang Gesanzuo 500kV substations constitute electromagnetic looped network, as shown in Table 1：
Table one
Preliminary partition scheme is formulated according to the composition form of electromagnetic looped network.First, the complicated electromagnetism ring that analysis A-E-D is constituted
Net partitioning scenario.It, can be solely for operation since there are three main transformers at the stations A；And the stations D can stand cooperation with C, therefore the stations D can be with
It stands with AE and solves inscription of loop；Because the stations E only have two main transformers, and it is not connected with other 500kV substations, it is all independently to transport
Row.To sum up, the uncoupling loop scheme of A-E-D complexity electromagnetic looped network has two kinds of an A-ED and AE-D, i.e. the stations A and the stations ED solution inscription of loop, the stations D with
The stations AE solution inscription of loop.Similarly, it is known that the stations B can stand with CD and solve inscription of loop in tri- substation's electromagnetic looped networks of B-C-D, the stations C and the stations D
Cooperation；Or the stations D and the stations BC solve inscription of loop, the stations B and the stations C cooperation.It integrates, preliminary partition scheme such as two institute of table
Show：
Table two
Wherein, " A-BC-DE " indicates that A solely stands operation, B and C, D and E Electromagnetic coupling, and D and C solution inscription of loop, other are similar；
" A-B, BC-D, A-DE " indicate that A and B waits unlinking, and BC and D waits unlinking, and A and DE waits unlinking, other are similar.
According to preliminary feasible uncoupling loop scheme above, electromagnetic looped network to be unlinked is obtained.It not only needs to search for be unlinked
The longitude and latitude thread path of electromagnetic looped network will also search for the longitude and latitude thread path between two cooperation stations in complicated electromagnetic looped network.Needle
To each of research power grid electromagnetic looped network to be unlinked, electromagnetic looped network to be unlinked and complicated electromagnetism ring are searched out in conjunction with Fig. 3
All longitude and latitude thread paths in net between cooperation station, as shown in Table 3：
Table three
Wherein, * indicates electromagnetic looped network to be unlinked.
According to the electromagnetic looped network longitude and latitude thread path situation to be unlinked being derived above, the disconnected of electromagnetic looped network to be unlinked is found
Line set.For example, for only Ge Liangzuo 500kV substations constitute simple electromagnetic looped network A-B, the looped network only there are one
A-B electromagnetic looped networks are divided into two sections by full weft path f-h according to the full weft path, i.e. A-fh and fh-B, then to every section of independence
Consider broken string set.For the complicated electromagnetic looped network that B-C-D is constituted, if B and C cooperations, D and BC solves inscription of loop, then D and BC
Electromagnetic looped network only have three warp paths, without weft path, thus be not required to using weft divide section, broken string set directly from
It is selected in three warp paths, in conjunction with broken string principle 2, D-n-o (BC) merges with D-q-r-n-o (BC) Path Clustering, and broken string is only
Consider no circuits, considers further that the path D-l (BC), just obtain the broken string collection that D-BC unlinks and be combined into no+Dl.Other complicated electromagnetic looped networks
Broken string Resource selection it is similar.Whole broken string set analysis results is as shown in Table 4：
Table four
According to the broken string set situation for the preliminary feasible partition scheme and its electromagnetic looped network to be unlinked being derived above, arrange
Obtain the various broken string collective combinations situations under each partition scheme, i.e., specific uncoupling loop scheme measure.Study the whole of power grid
Uncoupling loop scheme situation is as shown in Table 5, and there are five types of feasible partition schemes altogether, and the uncoupling loop scheme quantity of each partition scheme is different,
Uncoupling loop scheme shares 31 kinds.
Table five
| Partition scheme | Electromagnetic looped network to be unlinked | Uncoupling loop scheme number | |
| Partition scheme 1 | A-BC-DE | A-B, BC-D, A-DE | 4 × 1 × 2=8 |
| Partition scheme 2 | AE-BCD | A-B, AE-D | 4 × 2=8 |
| Partition scheme 3 | AB-CDE | A-DE,B-CD | 2 × 2=4 |
| Partition scheme 4 | AED-BC | A-B, BC-D | 4 × 1=4 |
| Partition scheme 5 | ABC-DE | A-DE, BC-D | 2 × 1=2 |
For the preliminary feasible uncoupling loop scheme being analyzed above, all uncoupling loop schemes are carried out below according to evaluation index
Evaluation and screening.According to the overall target of combination short circuit current and power supply capacity defined above, to more under various partition schemes
Kind uncoupling loop scheme is assessed, and the index of the descending arrangement of index, preceding 10 uncoupling loop schemes is as shown in Table 6：
Table six
As seen from the above table, the overall target of 8 kinds of uncoupling loop schemes of partition scheme 1 is more than 0, shows that meeting short circuit current is less than
The requirement of rupturing capacity is switched, the overall target of other partition schemes is less than 0, illustrates that there are still short circuit current excessive problems.It is right
8 kinds of uncoupling loop schemes of partition scheme 1 are ranked up screening using overall target 1, obtain the finger of uncoupling loop scheme 1 and uncoupling loop scheme 2
Scale value is maximum, and equal；The two uncoupling loop schemes are compared using overall target 2, it is known that the main transformer of uncoupling loop scheme 1 utilizes
Rate higher.Therefore, optimal uncoupling loop scheme is uncoupling loop scheme 1.
It, can be with supplement calculation single-phase short circuit current situation for the uncoupling loop scheme of screening.It is exceeded for single-phase short circuit current
Website, provide 500kV neutral point of main transformer install additional low reactance number and value suggestion.According to evaluation index value, output is optimal
Electromagnetic looped network uncoupling loop scheme.
Above-described specific implementation mode has carried out further the purpose of the present invention, technical solution and advantageous effect
It is described in detail, it should be understood that the foregoing is merely the specific implementation mode of the present invention, is not intended to limit the present invention
Protection domain, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (8)
- The analysis method 1. a kind of electromagnetic looped network based on longitude and latitude thread path unlinks automatically, which is characterized in that including：Step S1, obtains the composition form of electromagnetic looped network, and the composition form is the number and 500kV/ of 500kV substations The number of 220kV electromagnetic looped networks；Step S2 formulates preliminary partition scheme to obtain electromagnetic looped network to be unlinked according to the composition form of electromagnetic looped network；Step S3 finds the longitude and latitude thread path of electromagnetic looped network to be unlinked；Step S4 finds the broken string set of electromagnetic looped network to be unlinked；Step S5 formulates preliminary uncoupling loop scheme；Step S6 filters out optimal uncoupling loop scheme from the preliminary uncoupling loop scheme；The preliminary partition scheme is breaking part The power grid connection type that fragment area of 220kV substations is powered by 500kV substations is realized after 220kV circuits；Formulate preliminary subregion Scheme carries out in the following manner：For the 500kV substations with two main transformers, the 500kV substations and the electromagnetic looped network conjunction of adjacent 500kV substations Inscription of loop；For the 500kV substations with three and three or more main transformers, the 500kV substations and adjacent 500kV substations Electromagnetic looped network solution inscription of loop, or transported with adjacent 500kV substations electromagnetic looped network cyclization in the case where short circuit current is not exceeded Row；The foundation of the 500kV substations maximum quantity of electromagnetic looped network Electromagnetic coupling is that three short circuit current is not exceeded, if electromagnetism ring It is exceeded that three short circuit current occur in three 500kV substations of network closed loop operation, denominator operation measures is considered, if electromagnetic looped network It is exceeded that three short circuit current occur in four of Electromagnetic coupling and four or more 500kV substations, reduces electromagnetic looped network Electromagnetic coupling 500kV substations quantity；For the complicated electromagnetic looped network being made of three and three or more 500kV substations, if wherein Liang Zuo 500kV substations are protected Hold electromagnetic looped network Electromagnetic coupling, then a remaining 500kV substation should have three and three or more main transformer or can be with It is connected with other 500kV substations.
- The analysis method 2. electromagnetic looped network according to claim 1 based on longitude and latitude thread path unlinks automatically, which is characterized in that The longitude and latitude thread path is made of 220kV circuits, the Liang Zuo 500kV substations for connecting electromagnetic looped network.
- The analysis method 3. electromagnetic looped network according to claim 2 based on longitude and latitude thread path unlinks automatically, which is characterized in that The longitude and latitude thread path for finding electromagnetic looped network to be unlinked carries out in the following manner：When finding the warp path between electromagnetic looped network Zhong Liangzuo 500kV substations, cannot occur passing through twice or more than twice The connected 220kV substations of other 500kV substations first order, and cannot pass through the 500kV substations originated；For the complicated electromagnetic looped network being made of three 500kV substations, if wherein Liang Zuo 500kV substations electromagnetic looped network cyclization Operation, another 500kV substation it is independent or with other 500kV substations cooperations, then formulate another 500kV substation With the longitude and latitude thread path of wherein Liang Zuo 500kV substations；Find full weft and sub- weft.
- The analysis method 4. electromagnetic looped network according to claim 1 based on longitude and latitude thread path unlinks automatically, which is characterized in that The broken string set is made of 220kV circuits, for realizing electromagnetic looped network solution inscription of loop.
- The analysis method 5. electromagnetic looped network according to claim 4 based on longitude and latitude thread path unlinks automatically, which is characterized in that The broken string set for finding electromagnetic looped network to be unlinked carries out in the following manner：Weft path is not turned off, warp path is only disconnected；Realize that warp path disconnects using minimum broken string quantity；Broken string set cannot be entirely the first order circuit of same seat 500kV substations；For the series-fed mode warp path being made of two or two or more 500kV substations, pay the utmost attention to disconnect string For the middle line of formula structure；When two or more full weft has identical part weft, then independence considers the full weft of each.
- The analysis method 6. electromagnetic looped network according to claim 1 based on longitude and latitude thread path unlinks automatically, which is characterized in that The uncoupling loop scheme refers to the scheme that partition running is realized by specific 220kV open-circuit lines.
- The analysis method 7. electromagnetic looped network according to claim 6 based on longitude and latitude thread path unlinks automatically, which is characterized in that Formulating preliminary uncoupling loop scheme includes：Various broken string set situations under each preliminary partition scheme of matching are to obtain the various sides of unlinking under each partition scheme Case；Summarize the various uncoupling loop schemes under each partition scheme to obtain preliminary uncoupling loop scheme.
- The analysis method 8. electromagnetic looped network according to claim 7 based on longitude and latitude thread path unlinks automatically, which is characterized in that Filtering out optimal uncoupling loop scheme from the preliminary uncoupling loop scheme includes：Level-one evaluation index and two-level appraisement index are formulated, the level-one evaluation index is K1=KI×KP, the two-level appraisement refers to Mark K2=KI×KP×KT, wherein K1For the level-one evaluation index, K2For the two-level appraisement index, KIFor power grid after unlinking The busbar short-circuit current margins of middle minimum, KPFor the product of the power supply capacity of each section of power grid after unlinking, power grid is each after unlinking The power supply capacity of a section is the absolute value of the difference of section maximum supply load and section reference load than upper section reference load, KTIt carries for the main transformer of each section of power grid after unlinking and holds the product of ratio, the main transformer of each section of power grid, which carries, after unlinking holds than being section The ratio of maximum supply load and section main transformer total capacity；The maximum uncoupling loop scheme of level-one evaluation index value is filtered out from the various uncoupling loop schemes under each partition scheme as most Excellent uncoupling loop scheme；If the level-one evaluation index value of two kinds of uncoupling loop schemes is identical under same partition scheme, from two kinds of solutions under same partition scheme The maximum uncoupling loop scheme of two-level appraisement index value is filtered out in ring scheme as optimal uncoupling loop scheme.
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