CN107017635B - A kind of adaptive islanding control method and system - Google Patents
A kind of adaptive islanding control method and system Download PDFInfo
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- CN107017635B CN107017635B CN201710433394.3A CN201710433394A CN107017635B CN 107017635 B CN107017635 B CN 107017635B CN 201710433394 A CN201710433394 A CN 201710433394A CN 107017635 B CN107017635 B CN 107017635B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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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Abstract
The present invention discloses a kind of adaptive islanding control method, and the method includes determining that power grid needs off-the-line when grid collapses, on-line monitoring system unstability；Electromagnetic looped network is determined according to breadth-first search；The off-the-line mode of electromagnetic looped network is determined according to the electromagnetic looped network；Off-the-line is carried out to the off-the-line mode according to preset time and sequence is switched；It takes urgent measure to each isolated island obtained after off-the-line, guarantees isolated island stable operation.The present invention comprehensively considers electromagnetic looped network constraint condition, can not only improve existing adaptive islanding control, moreover it is possible to improve the security and stability of power grid.
Description
Technical field
The present invention relates to technical field of power systems, more particularly to a kind of adaptive islanding control method and system.
Background technique
Power grid needs to take islanding control measure in the case where catastrophe failure structural intergrity occurs and cannot be guaranteed
System crash is avoided, the search of off-the-line section is one of most important research contents of islanding control measure.In conventional power train
It is not allow that there are electromagnetic looped networks under normal circumstances in system, is only to allow electric system electromagnetic looped network in a special case
Operation, such as Electric Power Network Planning period, management system unsound period, power grid transition from the old to the new initial stage, the presence of electromagnetic looped network is to power grid
Operational management make troubles, also bring uncertain factor to the development of power grid.
Currently, existing adaptive islanding control method includes being based on ordered binary decision diagram (ordered binary
Decision diagram, English abbreviation OBDD) three stage methods, the Splitting Control based on the slow people having the same aspiration and interest；Based on orderly
The constraint condition that three stage methods of binary decision diagrams (bdds) OBDD consider has synchronous constraint, power-balance constraint and steady stability about
Beam；And slow coherent constraints, Weak link constraint, power-balance are had about based on the constraint condition that the Splitting Control of the slow people having the same aspiration and interest considers
Beam.It only considered coherent constraints, isolated island power-balance constraint, steady stability about in obvious existing adaptive islanding control method
The constraint conditions such as beam, there is no consideration this constraint conditions of electromagnetic looped network, therefore conventional adaptive islanding control usually assumes that
In power grid and electromagnetic looped network is not present, only the off-the-line on high-grade route, these methods consider the off-the-line strategy of actual electric network
When, it is general only to consider to carry out off-the-line on 500kv route by the node contraction of low-voltage-grade to voltage levels node.But it adopts
With above-mentioned adaptive islanding control method by after voltage levels line disconnection, there is no real off-the-lines into several orphans for power grid
Island, it is excessive to still result in electromagnetic looped network low-voltage-grade Line Flow, failure further expansion.
In view of the above-mentioned problems, how electromagnetic looped network constraint condition is applied to adaptive islanding control method is electric system
Technical field technical problem in the urgent need to address.
Summary of the invention
The object of the present invention is to provide a kind of adaptive islanding control method and system, comprehensively consider electromagnetic looped network constraint item
Part, to improve the security and stability of power grid.
To achieve the above object, the present invention provides a kind of adaptive islanding control method, the method includes following steps
It is rapid:
When grid collapses, on-line monitoring system unstability, determine that power grid needs off-the-line；
Electromagnetic looped network is determined according to breadth-first search；
The off-the-line mode of electromagnetic looped network is determined according to the electromagnetic looped network；
According to switching the preset time and sequentially carrying out off-the-line to the off-the-line mode, multiple isolated islands are obtained；
Each isolated island is handled, guarantees each isolated island stable operation.
Optionally, it is described electromagnetic looped network step is determined according to breadth first algorithm before, further includes:
Three-phase approach based on ordered binary decision diagram OBDD determines each first based on the Splitting Control of the slow people having the same aspiration and interest
Off-the-line mode between node；The first node is 500kV node.
Optionally, described to determine electromagnetic looped network according to breadth-first search, specific steps include:
N first node is obtained, determines n (n-1)/2 first node pair according to the n first nodes；
Using each first node as initial starting point, successively determined and each first segment according to breadth-first search
The connected node of point；
Any first node of choosing determines first node in k k according to the node being connected with each first node
Communication path between two first nodes；Wherein 1≤k≤n (n-1)/2, k round numbers；
Judge that the communication path with the presence or absence of non-shortest path, obtains the first judging result；
When first judging result, which is, is, judge to obtain on the non-shortest path with the presence or absence of second node
Second judging result；The second node is 220kV node；
When first judging result and second judging result are to be, determine that the non-shortest path is electromagnetism
Looped network, and the first node is rejected to k, judge whether the number of remaining first node pair is greater than 0, obtains third judgement knot
Fruit；When first judging result and described at least one result of second judging result are no, the first node pair is rejected
K, judges whether the number of remaining first node pair is greater than 0, obtains third judging result；
When the third judging result, which is, is, first node is chosen again to k；When the third result is no, choosing
Take all electromagnetic looped networks.
Optionally, the off-the-line mode that electromagnetic looped network is determined according to the electromagnetic looped network, specific steps include:
Determine that each second node in each electromagnetic looped network arrives first segment respectively according to node electrical distance formula
Point is to the distance between two first nodes in k；
Each second node is divided between each second node electrical distance most according to the minimum rule of distance
In isolated island where the small first node；
Judge whether each second node on electromagnetic looped network is all divided into same isolated island and obtains the 4th judgement
As a result；
When the 4th judging result be expressed as all be divided into same isolated island, then need by with each second node
Between at the maximum first node of electrical distance transformer disconnect the off-the-line mode as electromagnetic looped network；Sentence when the described 4th
Disconnected result is expressed as all being divided into same isolated island, then will be located at connected two in two different isolated islands described the
The separated off-the-line mode as electromagnetic looped network of two nodes.
Optionally, the node electrical distance formula are as follows:
Zij,equ=Zii+Zjj-2Zij(2)；
Wherein, Zij,eqIndicate the port equivalent impedance between node i, j, ZiiFor the self-impedance of node i, ZjjFor node j's
Self-impedance, ZijMutual impedance between node i, j.
The present invention also provides a kind of adaptive islanding control system, the system comprises:
First determining module, for determining that power grid needs off-the-line when grid collapses, on-line monitoring system unstability；
Second determining module, for determining electromagnetic looped network according to breadth-first search；
Third determining module, for determining the off-the-line mode of electromagnetic looped network according to the electromagnetic looped network；
Off-the-line module, for obtaining multiple according to switching the preset time and sequentially carrying out off-the-line to the off-the-line mode
Isolated island；
Stringent effort take module, for handling each isolated island, guarantee isolated island stable operation.
Optionally, between the first determining module and the second determining module further include:
4th determining module, for the three-phase approach based on ordered binary decision diagram OBDD or based on the off-the-line control of the slow people having the same aspiration and interest
Method processed determines the off-the-line mode between each first node；The first node is 500kV node.
Optionally, second determining module, specifically includes:
First node is to determination unit, for obtaining n first node, according to n first nodes determine n (n-1)/
2 first nodes pair；
Node determination unit is used for using each first node as initial starting point, successively according to breadth-first search
Determine the node being connected with each first node；
Communication path determination unit, for any selection first node to k, according to the section being connected with each first node
Point determines first node to the communication path between two first nodes in k, wherein 1≤k≤n (n-1)/2, k are rounded
Number；
First judging unit, for judging that the communication path with the presence or absence of non-shortest path, obtains the first judging result；
Second judgment unit, for when first judging result, which is, is, judge on the non-shortest path whether
There are second nodes, obtain the second judging result；The second node is 220kV node；
Third judging unit, for determining institute when first judging result and second judging result are to be
Stating non-shortest path is electromagnetic looped network, and rejects the first node to k, judges whether the number of remaining first node pair is greater than
0, obtain third judging result；When first judging result and described at least one result of second judging result are no, pick
Except the first node is to k, judge whether the number of remaining first node pair is greater than 0, obtains third judging result；
Selection unit, for when the third judging result, which is, is, choosing first node again to k；When the third
When being as a result no, all electromagnetic looped networks are chosen.
Optionally, the third determining module, specifically includes:
Euclidean distance between node pair determination unit, for determining each institute in each electromagnetic looped network according to node electrical distance formula
Second node is stated respectively to first node to the distance between two first nodes in k；
Division unit, for according to the minimum rule of distance by each second node be divided into each second node it
Between in isolated island where the smallest first node of electrical distance；
Whether the 4th judging unit, each second node for judging on electromagnetic looped network are all divided into same orphan
In island, the 4th judging result is obtained；
Electromagnetic looped network off-the-line mode determination unit, for being expressed as all being divided into same orphan when the 4th judging result
In island, then need transformer is disconnected as electricity at the maximum first node of electrical distance between each second node
The off-the-line mode of magnet ring net；It is divided into same isolated island when the 4th judging result is expressed as whole, then will be located at two
The separated off-the-line mode as electromagnetic looped network of connected two second node in a difference isolated island.
Optionally, the node electrical distance formula are as follows:
Zij,equ=Zii+Zjj-2Zij(2)；
Wherein, Zij,eqIndicate the port equivalent impedance between node i, j, ZiiFor the self-impedance of node i, ZjjFor node j's
Self-impedance, ZijMutual impedance between node i, j.
The specific embodiment provided according to the present invention, the invention discloses following technical effects: whether first determining whether power grid
Need off-the-line；Then electromagnetic looped network is determined according to breadth first algorithm；The off-the-line of electromagnetic looped network is determined according to the electromagnetic looped network
Mode；Off-the-line is carried out to the off-the-line mode according to preset time and sequence；Finally each isolated island obtained after off-the-line is taken
Stringent effort guarantee isolated island stable operation.The present invention comprehensively considers electromagnetic looped network constraint condition, can not only improve existing adaptive
Answer islanding control, moreover it is possible to improve the security and stability of power grid.
Detailed description of the invention
It in order to illustrate the embodiments of the present invention more clearly or technical approach in the prior art, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is adaptive islanding control of embodiment of the present invention method overview flow chart；
Fig. 2 is three-phase approach solution frame diagram of the embodiment of the present invention based on OBDD；
Fig. 3 is Splitting Control solution frame diagram of the embodiment of the present invention based on the slow people having the same aspiration and interest；
Fig. 4 is adaptive islanding control of embodiment of the present invention method part flow chart；
Fig. 5 port equivalent impedance schematic diagram between two node of the embodiment of the present invention；
Fig. 6 is adaptive islanding control of embodiment of the present invention system construction drawing；
Fig. 7 is 7 node connection figures of the embodiment of the present invention；
Fig. 8 is library of embodiment of the present invention gulf to the specific distance map in the Qujiang River.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, carries out to the technical approach in the embodiment of the present invention clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is multiple other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of adaptive islanding control method and system, comprehensively consider electromagnetic looped network constraint item
Part, to improve the security and stability of power grid.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
The present invention first clearly several explanations of nouns with physical significance, specifically include: off-the-line, electromagnetic looped network, electrically away from
From.
Off-the-line: it is lost when between generator and electric system other parts, between a part of system and system other parts
When desynchronizing and can not restore synchronous, the connection between them is cut off, is divided into mutually indepedent, compartment two-part skill
Art measure, the final important measures to maintain power system stability operation, preventing fault spread from causing serious consequence.
Electromagnetic looped network: electromagnetic looped network is also referred to as high and low electromagnetic circle net, refers to the connection by both ends transformer magnetic loop,
So that the phenomenon that lines in parallel operation of two groups of different voltages grades.The disconnection of electromagnetic looped network mesohigh route leads to turning for trend
It moves, it is likely that the further expansion to cause the accident.
Electrical distance: electrical distance is commonly used to the tightness degree contacted between description node or between node and system,
Its definition mode is very more, can be indicated with the operation relation in equivalent impedance matrix between certain tittle.If between certain nodes
Electrical link is close, and electrical distance is small, then should will be in these node divisions to the same isolated island.
Fig. 1 is adaptive islanding control of embodiment of the present invention method overview flow chart, as shown in Figure 1.The embodiment of the present invention
In order to facilitate discussion, so 500kV node is known as first node, 220kV node is known as second node.
Adaptive islanding control method of the present invention specifically includes the following steps:
Step 100: when grid collapses, on-line monitoring system unstability, determining that power grid needs off-the-line.
Step 200: the three-phase approach based on ordered binary decision diagram OBDD or the Splitting Control based on the slow people having the same aspiration and interest are true
Off-the-line mode between fixed each first node.
Step 300: electromagnetic looped network is determined according to breadth-first search.
Step 400: the off-the-line mode of electromagnetic looped network is determined according to the electromagnetic looped network.
Step 500: the multiple isolated islands of off-the-line acquisition being carried out to the off-the-line mode according to preset time and sequence is switched.
Step 600: each isolated island being handled, guarantees each isolated island stable operation.
It describes in detail below to each step.
Step 200: the three-phase approach based on ordered binary decision diagram OBDD or the Splitting Control based on the slow people having the same aspiration and interest are true
Off-the-line mode between fixed each first node.
Fig. 2 gives the three-phase approach based on OBDD and solves frame diagram, as shown in Figure 2.It is described to be based on orderly binary decision
The three-phase approach of figure OBDD determines the specific steps of the off-the-line mode between each first node are as follows:
1), control centre further analyzes current Failure Model, and online recognition goes out Coherent Generator Group.
2) the off-the-line mode between each first node, is determined.This step is a part of three-phase approach most critical, is used
Be " search+verification " thinking.As can be known from Fig. 2, reasonable off-the-line section in order to obtain, the constraint item that the search phase uses
Part is Coherent Generator Group constraint and isolated island power-balance constraint.Previous constraint condition requires for an asynchronous group of planes to be isolated to different
On isolated island, this is the feasible necessary condition of off-the-line strategy.Power supply and load in the requirement of the latter constraint condition will be substantially
It is equal, to guarantee the power supply of load.After constraint condition is added, off-the-line policy space reduces significantly.Then each is met about
The candidate policy of beam condition carries out steady stability verification, and the solution for obtaining steady operation point is reasonable off-the-line strategy.
Fig. 3 is Splitting Control solution frame diagram of the embodiment of the present invention based on the slow people having the same aspiration and interest, as shown in Figure 3.Based on slow
The islanding control of the people having the same aspiration and interest is based on electric system inearized model.The equations of state for deriving electric system first, obtains shape
State matrix then seeks the characteristic root of state matrix, and then carries out Multiple Time Scales specificity analysis to system；If system is fast
Slow mode line of demarcation is relatively clear, then system is suitble to off-the-line.Then the slow mode group of selecting system carries out system node slow same
Tune divides group.The basic ideas of off-the-line section selection are, will be real in the case where large disturbances, which occur, for electric system leads to system unstability
Border divides group to compare with slow coherence grouping result, can be in the Weak link route between slow homology group if the two is coincide
Locate off-the-line, otherwise will determine off-the-line section according to practical point of public sentiment condition of unit.As it can be seen that the islanding control side based on the slow people having the same aspiration and interest
Method determines that the specific steps of the off-the-line mode between each first node include:
1), do the best system linearization model, carry out signature analysis.
2), selecting system slow mode, the slow coherence grouping of system node.
3) Weak link route between homology group, is identified.
4), after failure, the off-the-line mode between each first node is determined according to specific Failure Model.
Step 300: electromagnetic looped network is determined according to breadth-first search.
Fig. 4 is adaptive islanding control of embodiment of the present invention method part flow chart, as shown in Figure 4.It is described according to range
First search algorithm determines electromagnetic looped network, and specific steps include:
Step 301: obtaining n first node, determine n (n-1)/2 first node pair according to the n first nodes.
Step 302: using each first node as initial starting point, successively being determined and each institute according to breadth-first search
State the connected node of first node.
Step 303: any first node of choosing determines first segment according to the node being connected with each first node to k
Point is to the communication path between two first nodes in k, wherein 1≤k≤n (n-1)/2, k round numbers.
Step 304: judging the communication path with the presence or absence of non-shortest path；If it exists, 305 are thened follow the steps；Otherwise
Execute step 306；
Step 305: judging on the non-shortest path with the presence or absence of second node；If so, the non-shortest path
For electromagnetic looped network, and execute step 306；It is no to then follow the steps 306.
Step 306: rejecting first node to k, judge whether the number of remaining first node pair is greater than 0；If so, executing
Step 303；Otherwise all electromagnetic looped networks are chosen.
Step 400: the off-the-line mode of electromagnetic looped network is determined according to the electromagnetic looped network.
Fig. 5 port equivalent impedance schematic diagram between two node of the embodiment of the present invention, as shown in Figure 5.Between node electrically away from
From definition mode it is very much, electrical distance is defined as the port equivalent impedance Z between two o'clock between node i of the present invention, jij,equ。
In the two-port network of i, j composition, unitary current e is inputtedij, with port voltage U between two o'clockijDivided by electric current eijIt can obtain
To port equivalent impedance Zij,equ, specifically it is detailed in following formula:
Zij,equ=Uij/eij=Uij(1)；
According to principle of stacking, Two-port netwerk equivalent impedance is indicated with node equivalent impedance, and specific node electrical distance is public
Formula are as follows:
Zij,equ=Zii+Zjj-2Zij(2)；
Wherein, Zij,eqIndicate the port equivalent impedance between node i, j, ZiiFor the self-impedance of node i, ZjjFor node j's
Self-impedance, ZijMutual impedance between node i, j.
The off-the-line mode that electromagnetic looped network is determined according to the electromagnetic looped network, specific steps include:
Step 401: determining that each second node in each electromagnetic looped network is distinguished according to node electrical distance formula
To first node to the distance between two first nodes in k.
Step 402: each second node is divided by the electricity between each second node according to the minimum rule of distance
Gas is in the isolated island where the smallest first node.
Step 403: judging whether each second node on electromagnetic looped network is all divided into same isolated island, obtain
4th judging result.
Step 404: when the 4th judging result be expressed as all be divided into same isolated island, then need by with it is each described
Transformer disconnects the off-the-line mode as electromagnetic looped network at the maximum first node of electrical distance between second node；Work as institute
It states the 4th judging result to be expressed as not being divided into same isolated island all, then will be located at connected two in two different isolated islands
The separated off-the-line mode as electromagnetic looped network of a second node.
Step 500: off-the-line being carried out to the off-the-line mode according to preset time and sequence is switched.
Since the different degree of link each in power grid is different, so significance level configuration switch of the present invention according to each link
The time of execution and sequence, therefore the present invention carries out off-the-line to the off-the-line mode according to preset time and sequence is switched.
Step 600: each isolated island being handled, guarantees each isolated island stable operation.
The isolated island obtained after off-the-line is taken and is handled, the processing method specifically includes: cutting machine-cut load, adjustment hair
Electric machine frequency.When power generation is greater than load in isolated island, cut-out generator, when load is greater than power generation, excision
Sub-load.When islanded system frequency is bigger than normal or less than normal, generator frequency is adjusted, maintains isolated island frequency stabilization.
Fig. 6 is adaptive islanding control of embodiment of the present invention system construction drawing, as shown in fig. 6, the system comprises: first
Determining module 1, the 4th determining module 2, the second determining module 3, third determining module 4, off-the-line module 5, stringent effort take mould
Block 6.
First determining module 1, for determining that power grid needs off-the-line when grid collapses, on-line monitoring system unstability.
4th determining module 2, for the three-phase approach based on ordered binary decision diagram OBDD or the off-the-line based on the slow people having the same aspiration and interest
Control method determines the off-the-line mode between each first node；The first node is 500kV node.
Second determining module 3, for determining electromagnetic looped network according to breadth-first search.Second determining module,
Specifically include: first node sentences determination unit, node determination unit, communication path determination unit, the first judging unit, second
Disconnected unit, third judging unit, selection unit.
First node is to determination unit, for obtaining n first node, according to n first nodes determine n (n-1)/
2 first nodes pair.
Node determination unit is used for using each first node as initial starting point, successively according to breadth-first search
Determine the node being connected with each first node.
Communication path determination unit, for any selection first node to k, according to the section being connected with each first node
Point determines first node to the communication path between two first nodes in k, wherein 1≤k≤n (n-1)/2, k are rounded
Number.
First judging unit, for judging that the communication path with the presence or absence of non-shortest path, obtains the first judging result.
Second judgment unit, for when first judging result, which is, is, judge on the non-shortest path whether
There are second nodes, obtain the second judging result；The second node is 220kV node.
Third judging unit, for determining institute when first judging result and second judging result are to be
Stating non-shortest path is electromagnetic looped network, and rejects the first node to k, judges whether the number of remaining first node pair is greater than
0, obtain third judging result；When first judging result and described at least one result of second judging result are no, pick
Except the first node is to k, judge whether the number of remaining first node pair is greater than 0, obtains third judging result.
Selection unit, for when the third judging result, which is, is, choosing first node again to k；When the third
When being as a result no, all electromagnetic looped networks are chosen.
Third determining module 4, for determining the off-the-line mode of electromagnetic looped network according to the electromagnetic looped network.The third determines
Module specifically includes: euclidean distance between node pair determination unit, division unit, the 4th judging unit, electromagnetic looped network off-the-line mode determine single
Member.
Euclidean distance between node pair determination unit, for determining each institute in each electromagnetic looped network according to node electrical distance formula
Second node is stated respectively to first node to the distance between two first nodes in k.
The node electrical distance formula are as follows:
Zij,equ=Zii+Zjj-2Zij(2)；
Wherein, Zij,eqIndicate the port equivalent impedance between node i, j, ZiiFor the self-impedance of node i, ZjjFor node j's
Self-impedance, ZijMutual impedance between node i, j.
Division unit, for according to the minimum rule of distance by each second node be divided into each second node it
Between in isolated island where the smallest first node of electrical distance.
Whether the 4th judging unit, each second node for judging on electromagnetic looped network are all divided into same orphan
In island, the 4th judging result is obtained.
Electromagnetic looped network off-the-line mode determination unit, for being expressed as all being divided into same orphan when the 4th judging result
In island, then need transformer is disconnected as electricity at the maximum first node of electrical distance between each second node
The off-the-line mode of magnet ring net；It is divided into same isolated island when the 4th judging result is expressed as whole, then will be located at two
The separated off-the-line mode as electromagnetic looped network of connected two second node in a difference isolated island.
Off-the-line module 5, for obtaining multiple according to switching the preset time and sequentially carrying out off-the-line to the off-the-line mode
Isolated island.
Stringent effort take module 6, for handling each isolated island, guarantee isolated island stable operation.
Adaptive islanding control method in the present invention can adapt to the variation of system operation mode automatically, either topological
The variation of structure or the change of flow state all have fine adaptability.
Case 1:
Adaptive islanding control gradually obtains off-the-line plan by being continuously added constraint condition in initial decision space
Slightly.The constraint condition of consideration has coherent constraints, isolated island power-balance constraint, steady stability constraint etc., three stages based on OBDD
Method can determine the off-the-line mode between each first node.In practice, disconnection device is generally mounted to high voltage grade to engineering
On route, i.e. first node route, therefore can only determine whether first node route cut-offs based on the three-phase approach of OBDD.If
There are electromagnetic looped networks between first node-second node route, and obtained off-the-line strategy breaks just at electromagnetic looped network first
It opens, it is also necessary to provide the off-the-line mode of corresponding second node route.
Fig. 7 gives the connection figure between 7 nodes, by taking Fig. 7 as an example, the present invention using breadth first search hair search with
The connected node of each first node, it is assumed that V0, V1, V2, V3 are first node, i.e. 500kV node, and V4, V5, V6 are second
Node, i.e. 220kV node, are scanned for using breadth first algorithm, and first search obtains 4 first nodes, and with 4 first segments
Point is start node, i.e., using V0, V1, V2, V3 as start node, traverses connected node.In ergodic process, do not consider further that
The node found.It is described in detail by taking V0 as an example, V0 connected node { V1, V2, V4 } is found in search for the first time；It searches for the second time
Rope finds V2 connected node { V0, V1, V5 }, finds V1 connected node { V0, V2, V3 }, finds V4 connected node { V0, V6 }, removes
The node found is removed, searching for the new node found for the second time has { V3, V5, V6 }；New node is not found in third time search,
So the node being connected with V0 is { V1, V2, V4, V3, V5, V6 }.Node adjacent with V1, V2, V3 respectively, which can similarly be found, is
{V0,V2,V4,V3,V5,V6},{V0,V1,V5,V3,V4,V6},{V1,V0,V2,V4,V5,V6}.Using V0, V2 as first node
It is right, determine that the communication path between first node internal two first nodes V0, V2 there are 3, i.e. V0-V2, V0-V1-V2,
V0-V4-V6-V5-V2, because V0-V4-V6-V5-V2 communication path is not shortest path and there are 3 second nodes,
V0-V4-V6-V5-V2 is electromagnetic looped network.(connect because the communication path between V0-V2 and V0-V1-V2 belongs between first node
It is logical, so the specific off-the-line mode between first node determines the off-the-line side between each first node according to the three-phase approach of OBDD
Formula), it similarly can determine between the internal first node of other first nodes with the presence or absence of electromagnetic looped network.
It is calculated separately between second node V4, V5, V6 and first node V0, V2 using node electrical distance formula (2)
Electrical distance, and by the isolated island where node division to the smaller node of electrical distance, for example, second node V4, V6 and V0 it
Between electrical distance it is smaller, illustrate to contact between second node V4, V6 and V0 more closely, then the two nodes be grouped into V0 institute
In isolated island, the electrical distance between second node V5 and node V2 is smaller, then this node is grouped into where first node V2
In isolated island, therefore specific off-the-line mode as electromagnetic looped network will be disconnected in second node V5 and V6.(such as second node V4, V5,
Electrical distance of the V6 between V0 is smaller, illustrates that second node V4, V5, V6 are contacted between V0 more closely, then by this
Where three nodes are grouped into V0 in isolated island, need to disconnect in the transformer between V2-V5 at this time, such case is in actual electric network
Almost impossible generation, because of the impedance very little of transformer, the electrical link between V2, V5 is very close, and V5, V6 are power line
Road, impedance is generally large, so V5 can belong to V2 under normal circumstances.).
Case 2:
Specific embodiment in the present invention is using Guangdong Power Grid summer big data in 2015 firstly, being calculated using breadth first search
The electromagnetic looped network that method finds Guangdong Power Grid has altogether at 23, and specifically see Table 1 for details.
The electromagnetic looped network of 1 Guangdong Power Grid of table
According to table 1, judge whether the node at 23 needs to disconnect.The present invention between library gulf and the Qujiang River to deposit at wherein one
It is analyzed for electromagnetic looped network.If Jiang Kuwan, the Qujiang River is wanted to be divided on different isolated islands in addition to disconnecting between the two
First node route, it is also necessary to disconnect second node route.Specifically calculate moon gulf, Longshine, Shaoguan A factory respectively with library gulf,
The electrical distance of Qujiang River node, as shown in Figure 8.
Node and both ends first node electrical distance on 2 alternate path of table
By table 2 and Fig. 8 it is found that moon gulf node and library gulf node electrical distance are smaller, contact it is closer, therefore by the moon
Gulf node and library gulf node division are same isolated island；And bright new node, Shaoguan A factory and Qujiang River electrical distance are smaller, connection is more
Closely, therefore by bright new node, Shaoguan A factory and the Qujiang River it is electrically divided into same isolated island；Because moon gulf node, bright new node,
Shaoguan A factory is second node, so it is disconnected to need will be switched off moon gulf-Longshine double loop and moon gulf-Shaoguan A factory double loop
It opens.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For system disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (6)
1. a kind of adaptive islanding control method, which is characterized in that the described method comprises the following steps:
When grid collapses, on-line monitoring system unstability, determine that power grid needs off-the-line；
Electromagnetic looped network is determined according to breadth-first search；
The off-the-line mode of electromagnetic looped network is determined according to the electromagnetic looped network；
According to switching the preset time and sequentially carrying out off-the-line to the off-the-line mode, multiple isolated islands are obtained；
Each isolated island is handled, guarantees each isolated island stable operation；
Described to determine electromagnetic looped network according to breadth-first search, specific steps include:
N first node is obtained, determines n (n-1)/2 first node pair according to the n first nodes；
Using each first node as initial starting point, successively determined and each first node phase according to breadth-first search
Node even；
Any first node of choosing determines first node to two in k k according to the node being connected with each first node
Communication path between the first node；Wherein 1≤k≤n (n-1)/2, k round numbers；
Judge that the communication path with the presence or absence of non-shortest path, obtains the first judging result；
When first judging result, which is, is, judge to obtain second with the presence or absence of second node on the non-shortest path
Judging result；The second node is 220kV node；
When first judging result and second judging result are to be, determine that the non-shortest path is electromagnetism ring
Net, and the first node is rejected to k, judge whether the number of remaining first node pair is greater than 0, obtains third judging result；
When first judging result and described at least one result of second judging result are no, the first node is rejected to k, is sentenced
Whether the number of disconnected residue first node pair is greater than 0, obtains third judging result；
When the third judging result, which is, is, first node is chosen again to k；When the third judging result is no, choosing
Take all electromagnetic looped networks；
The off-the-line mode that electromagnetic looped network is determined according to the electromagnetic looped network, specific steps include:
Determine that each second node in each electromagnetic looped network arrives first node to k respectively according to node electrical distance formula
In the distance between two first nodes；
It is the smallest according to each second node is divided into the electrical distance between each second node apart from minimum rule
In isolated island where the first node；
Judge whether each second node on electromagnetic looped network is all divided into same isolated island, obtains the 4th judgement knot
Fruit；
When the 4th judging result is expressed as all being divided into same isolated island, then needing will be between each second node
Transformer disconnects the off-the-line mode as electromagnetic looped network at the maximum first node of electrical distance；When the 4th judgement knot
Fruit is expressed as not being divided into same isolated island all, then will be located at connected two second section in two different isolated islands
The separated off-the-line mode as electromagnetic looped network of point；
The first node is 500kV node.
2. adaptive islanding control method according to claim 1, which is characterized in that described according to breadth first algorithm
Before determining electromagnetic looped network step, further includes:
Three-phase approach based on ordered binary decision diagram OBDD determines each first node based on the Splitting Control of the slow people having the same aspiration and interest
Between off-the-line mode；The first node is 500kV node.
3. adaptive islanding control method according to claim 1, which is characterized in that the node electrical distance formula
Are as follows:
Zij,equ=Zii+Zjj-2Zij(2)；
Wherein, Zij,equIndicate the port equivalent impedance between node i, j, ZiiFor the self-impedance of node i, ZjjFor hindering certainly for node j
It is anti-, ZijMutual impedance between node i, j.
4. a kind of adaptive islanding control system, which is characterized in that the system comprises:
First determining module, for determining that power grid needs off-the-line when grid collapses, on-line monitoring system unstability；
Second determining module, for determining electromagnetic looped network according to breadth-first search；
Third determining module, for determining the off-the-line mode of electromagnetic looped network according to the electromagnetic looped network；
Off-the-line module, for obtaining multiple isolated islands according to switching the preset time and sequentially carrying out off-the-line to the off-the-line mode；
Stringent effort take module, for handling each isolated island, guarantee isolated island stable operation；
Second determining module, specifically includes:
First node is to determination unit, for obtaining n first node, determines n (n-1)/2 according to the n first nodes
First node pair；
Node determination unit, for successively being determined according to breadth-first search using each first node as initial starting point
The node being connected with each first node；
Communication path determination unit, it is true according to the node being connected with each first node for any selection first node to k
First node is determined to the communication path between two first nodes in k, wherein 1≤k≤n (n-1)/2, k round numbers；
First judging unit, for judging that the communication path with the presence or absence of non-shortest path, obtains the first judging result；
Second judgment unit, for judging to whether there is on the non-shortest path when first judging result, which is, is
Second node obtains the second judging result；The second node is 220kV node；
Third judging unit, for determining described non-when first judging result and second judging result are to be
Shortest path is electromagnetic looped network, and rejects the first node to k, judges whether the number of remaining first node pair is greater than 0, obtains
Obtain third judging result；When first judging result and described at least one result of second judging result are no, institute is rejected
First node is stated to k, judges whether the number of remaining first node pair is greater than 0, obtains third judging result；
Selection unit, for when the third judging result, which is, is, choosing first node again to k；When the third judges
When being as a result no, all electromagnetic looped networks are chosen；
The third determining module, specifically includes:
Euclidean distance between node pair determination unit, for determining each described in each electromagnetic looped network according to node electrical distance formula
Two nodes are respectively to first node to the distance between two first nodes in k；
Division unit, it is electric for each second node to be divided between each second node according to the minimum rule of distance
Gas is in the isolated island where the smallest first node；
Whether the 4th judging unit, each second node for judging on electromagnetic looped network are all divided into same isolated island
It is interior, obtain the 4th judging result；
Electromagnetic looped network off-the-line mode determination unit, for being expressed as all being divided into same isolated island when the 4th judging result
It is interior, then it needs transformer is disconnected as electromagnetism at the maximum first node of electrical distance between each second node
The off-the-line mode of looped network；It is divided into same isolated island when the 4th judging result is expressed as whole, then will be located at two
The separated off-the-line mode as electromagnetic looped network of connected two second node in different isolated islands；
The first node is 500kV node.
5. adaptive islanding control system according to claim 4, which is characterized in that true in the first determining module and second
Between cover half block further include:
4th determining module, for the three-phase approach based on ordered binary decision diagram OBDD or the islanding control side based on the slow people having the same aspiration and interest
Method determines the off-the-line mode between each first node；The first node is 500kV node.
6. adaptive islanding control system according to claim 4, which is characterized in that the node electrical distance formula
Are as follows:
Zij,equ=Zii+Zjj-2Zij(2)；
Wherein, Zij,equIndicate the port equivalent impedance between node i, j, ZiiFor the self-impedance of node i, ZjjFor hindering certainly for node j
It is anti-, ZijMutual impedance between node i, j.
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