CN107017635A - 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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- CN107017635A CN107017635A CN201710433394.3A CN201710433394A CN107017635A CN 107017635 A CN107017635 A CN 107017635A CN 201710433394 A CN201710433394 A CN 201710433394A CN 107017635 A CN107017635 A CN 107017635A
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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
Abstract
The present invention discloses a kind of adaptive islanding control method, and methods described is included when grid collapses, on-line monitoring system unstability, determines that power network 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；Off-the-line is carried out to the off-the-line mode according to default time and order is switched；Each isolated island obtained after off-the-line is taken urgent measure, it is ensured that isolated island stable operation.The present invention considers electromagnetic looped network constraints, can not only improve existing adaptive islanding control, moreover it is possible to improve the security and stability of power network.
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 technology
Catastrophe failure is occurring for power network, it is necessary to take islanding control measure in the case that structural intergrity 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 generally not allow the presence of electromagnetic looped network in system, is only to allow power system electromagnetic looped network in a special case
Operation, such as Electric Power Network Planning period, management system unsound period, power network transition from the old to the new initial stage, the presence of electromagnetic looped network is to power network
Operational management make troubles, the also development to power network brings uncertain factor.
At present, 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 constraints that binary decision diagrams (bdds) OBDD three stage methods consider has synchronous constraint, power-balance constraint and steady stability about
Beam；And the constraints that the Splitting Control based on the slow people having the same aspiration and interest considers has slow coherent constraints, Weak link constraint, power-balance about
Beam.Coherent constraints, isolated island power-balance constraint, steady stability are only considered in obvious existing adaptive islanding control method about
The constraintss such as beam, this constraints of electromagnetic looped network is not considered, therefore conventional adaptive islanding control is usually assumed that
In power network and in the absence of electromagnetic looped network, the only off-the-line on high-grade circuit, 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 circuits by the node contraction of low-voltage-grade to voltage levels node.But adopt
With above-mentioned adaptive islanding control method by after voltage levels line disconnection, power network does not have real off-the-line into several orphans
Island, still results in that electromagnetic looped network low-voltage-grade Line Flow is excessive, and failure further expands.
In view of the above-mentioned problems, it is power system how electromagnetic looped network constraints to be applied into adaptive islanding control method
Technical field technical problem in the urgent need to address.
The content of the invention
It is an object of the invention to provide a kind of adaptive islanding control method and system, electromagnetic looped network constraint bar is considered
Part, to improve the security and stability of power network.
To achieve the above object, the invention provides a kind of adaptive islanding control method, methods described includes following step
Suddenly：
When grid collapses, on-line monitoring system unstability, determine that power network 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 default time and off-the-line sequentially being carried out to the off-the-line mode, multiple isolated islands are obtained；
Each isolated island is handled, it is ensured that each isolated island stable operation.
Optionally, it is described electromagnetic looped network step is determined according to breadth first algorithm before, in addition to：
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 determine each first
Off-the-line mode between node；The first node is 500kV nodes.
Optionally, described to determine electromagnetic looped network according to breadth-first search, specific steps include：
N first node is obtained, n (n-1)/2 first node pair is determined according to the n first nodes；
Using each first node as initial starting point, determined successively according to breadth-first search and each first segment
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 whether there is non-shortest path, obtain the first judged result；
When first judged result when being, to judge to whether there is Section Point on the non-shortest path, obtain
Second judged result；The Section Point is 220kV nodes；
When first judged result and second judged result are to be, it is electromagnetism to determine the non-shortest path
Looped network, and the first node is rejected to k, judge whether the number of remaining first node pair is more than 0, obtain the 3rd and judge knot
Really；When first judged result and described at least one result of second judged result are no, the first node pair is rejected
K, judges whether the number of remaining first node pair is more than 0, obtains the 3rd judged result；
When the 3rd judged result for when being, selection first node is to k again；When the 3rd 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 Section Point in each electromagnetic looped network arrives first segment respectively according to node electrical distance formula
Point is to the distance between two described first nodes in k；
Each Section Point is divided between each Section Point most by electrical distance according to the minimum rule of distance
In isolated island where the small first node；
Judge whether each described Section Point on electromagnetic looped network is all divided into same isolated island and obtain the 4th judgement
As a result；
When the 4th judged result be expressed as all be divided into same isolated island, then need by with each Section Point
Between at the maximum first node of electrical distance transformer disconnect 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 by 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 is：
Zij,equ=Zii+Zjj-2Zij(2)；
Wherein, Zij,eqRepresent the port equivalent impedance between node i, j, ZiiFor the self-impedance of node i, ZjjFor node j's
Self-impedance, ZijFor the mutual impedance between node i, j.
The present invention also provides a kind of adaptive islanding control system, and the system includes：
First determining module, for when grid collapses, on-line monitoring system unstability, determining that power network needs off-the-line；
Second determining module, for determining electromagnetic looped network according to breadth-first search；
3rd determining module, the off-the-line mode for determining electromagnetic looped network according to the electromagnetic looped network；
Off-the-line module, for according to switching the default time and off-the-line sequentially being carried out to the off-the-line mode, obtaining multiple
Isolated island；
Stringent effort take module, for handling each isolated island, it is ensured that isolated island stable operation.
Optionally, also include between the first determining module and the second determining module：
4th determining module, for the three-phase approach based on ordered binary decision diagram OBDD or the off-the-line control based on 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 nodes.
Optionally, second determining module, is specifically included：
First node is to determining unit, for obtaining n first node, according to n first nodes determine n (n-1)/
2 first nodes pair；
Node determining unit, for using each first node as initial starting point, according to breadth-first search successively
It is determined that the node being connected with each first node；
Communication path determining 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 whether there is non-shortest path, obtains the first judged result；
Second judging unit, during for being when first judged result, judge on the non-shortest path whether
There is Section Point, obtain the second judged result；The Section Point is 220kV nodes；
3rd judging unit, for when first judged result and second judged result are to be, determining institute
Non- shortest path is stated for electromagnetic looped network, and rejects the first node to k, judges whether the number of remaining first node pair is more than
0, obtain the 3rd judged result；When first judged result and described at least one result of second judged result are no, pick
Except the first node is to k, judges whether the number of remaining first node pair is more than 0, obtain the 3rd judged result；
Unit being chosen, during for being when the 3rd judged result, first node is chosen again to k；When the described 3rd
When being as a result no, all electromagnetic looped networks are chosen.
Optionally, the 3rd determining module, is specifically included：
Euclidean distance between node pair determining unit, for determining each institute in each electromagnetic looped network according to node electrical distance formula
Section Point is stated respectively to first node to the distance between two described first nodes in k；
Division unit, for according to the minimum rule of distance by each Section Point be divided into each Section Point it
Between in isolated island where the minimum first node of electrical distance；
Whether the 4th judging unit, each described Section Point for judging on electromagnetic looped network is all divided into same orphan
In island, the 4th judged result is obtained；
Electromagnetic looped network off-the-line mode determining unit, for being expressed as all being divided into same orphan when the 4th judged result
In island, then need to regard transformer disconnection at the maximum first node of electrical distance between each Section Point as electricity
The off-the-line mode of magnet ring net；When the 4th judged result is expressed as not being divided into same isolated island all, then it will be located at two
The separated off-the-line mode as electromagnetic looped network of connected two Section Point in individual different isolated islands.
Optionally, the node electrical distance formula is：
Zij,equ=Zii+Zjj-2Zij(2)；
Wherein, Zij,eqRepresent the port equivalent impedance between node i, j, ZiiFor the self-impedance of node i, ZjjFor node j's
Self-impedance, ZijFor the mutual impedance between node i, j.
The specific embodiment provided according to the present invention, the invention discloses following technique effect：Whether first determine whether power network
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 default time and order；Finally each isolated island obtained after off-the-line is taken
Stringent effort, it is ensured that isolated island stable operation.The present invention considers electromagnetic looped network constraints, can not only improve existing adaptive
Answer islanding control, moreover it is possible to improve the security and stability of power network.
Brief description of the drawings
In order to illustrate the embodiments of the present invention more clearly or technical approach of the prior art, below will be to institute in embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is adaptive islanding control method overview flow chart of the embodiment of the present invention；
Fig. 2 is that three-phase approach of the embodiment of the present invention based on OBDD solves frame diagram；
Fig. 3 is that Splitting Control of the embodiment of the present invention based on the slow people having the same aspiration and interest solves frame diagram；
Fig. 4 is the local flow chart of adaptive islanding control of embodiment of the present invention method；
Fig. 5 is port equivalent impedance schematic diagram between the node of the embodiment of the present invention two；
Fig. 6 is adaptive islanding control system construction drawing of the embodiment of the present invention；
Fig. 7 is 7 node connection figures of the embodiment of the present invention；
Fig. 8 is storehouse of embodiment of the present invention gulf to the specific distance map in the Qujiang River.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical approach in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is multiple other
Embodiment, belongs to the scope of protection of the invention.
It is an object of the invention to provide a kind of adaptive islanding control method and system, electromagnetic looped network constraint bar is considered
Part, to improve the security and stability of power network.
In order to facilitate the understanding of the purposes, features and advantages of the present invention, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is further detailed explanation.
First clearly several explanations of nouns with physical significance of the invention, are specifically included：Off-the-line, electromagnetic looped network, electrically away from
From.
Off-the-line：Lost when between generator and power system other parts, between a part for system and system other parts
When desynchronizing and can not recover synchronous, the contact between them is cut off, is divided into separate, compartment two-part skill
Art measure, it is final to be run for maintenance power system stability, prevent fault spread from causing the important measures of serious consequence.
Electromagnetic looped network：Electromagnetic looped network is also referred to as high and low electromagnetic circle net, refers to the connection by two ends transformer magnetic loop,
So that the phenomenon of the lines in parallel operation of two groups of different voltage class.The disconnection of electromagnetic looped network mesohigh circuit causes turning for trend
Move, it is likely that the further expansion caused 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 represented with the operation relation between certain tittle in equivalent impedance matrix.If between some nodes
Electrical link is close, and electrical distance is small, then should be by these node divisions to same isolated island.
Fig. 1 is adaptive islanding control method overview flow chart of the embodiment of the present invention, as shown in Figure 1.The embodiment of the present invention
Discuss for convenience, so 500kV nodes are referred to as into first node, 220kV nodes are referred to as Section Point.
Adaptive islanding control method of the present invention specifically includes following steps：
Step 100：When grid collapses, on-line monitoring system unstability, determine that power network needs off-the-line.
Step 200：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：Multiple isolated islands are obtained according to switching the default time and off-the-line sequentially being carried out to the off-the-line mode.
Step 600：Each isolated island is handled, it is ensured that each isolated island stable operation.
Each step is described in detail below.
Step 200：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
Figure OBDD three-phase approach determines concretely comprising the following steps for the off-the-line mode between each first node：
1), control centre is further analyzed 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 for three-phase approach most critical, and it is used
Be " search+verification " thinking.As can be known from Fig. 2, in order to obtain rational off-the-line section, the constraint bar that the search phase uses
Part is that Coherent Generator Group is constrained and isolated island power-balance constraint.An asynchronous group of planes is isolated to different by previous constraints requirement
On isolated island, this is the feasible necessary condition of off-the-line strategy.Supply of electric power in latter constraints requirement will be substantially with load
It is equal, to ensure the power supply of load.Add after constraints, off-the-line policy space is reduced significantly.Then to each satisfaction about
The candidate policy of beam condition carries out steady stability verification, and the solution for obtaining steady operation point is rational off-the-line strategy.
Fig. 3 is that Splitting Control of the embodiment of the present invention based on the slow people having the same aspiration and interest solves frame diagram, as shown in Figure 3.Based on slow
The islanding control of the people having the same aspiration and interest is based on power system inearized model.The equations of state of power system is derived first, obtains shape
State matrix, then asks for the characteristic root of state matrix, and then carry out Multiple Time Scales specificity analysis to system；If system is fast
Slow mode line of demarcation is more clear, then system is adapted to off-the-line.Then the slow mode group of selecting system, is carried out slow same to system node
Adjust a point group.The basic ideas of off-the-line section selection are, in the case where power system generation large disturbances cause system unstability, by fact
Border point group is contrasted with slow coherence grouping result, if both identical, Weak link circuit that can be between slow homology group
Locate off-the-line, otherwise off-the-line section will be determined according to actual point of public sentiment condition of unit.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 circuit between identification homology group.
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 the local flow chart of adaptive islanding control of embodiment of the present invention method, as shown in Figure 4.It is described according to range
First search algorithm determines electromagnetic looped network, and specific steps include：
Step 301：N first node is obtained, n (n-1)/2 first node pair is determined according to the n first nodes.
Step 302：Using each first node as initial starting point, determined successively according to breadth-first search and each institute
State the connected node of first node.
Step 303：Any first node of choosing determines first segment to k according to the node being connected with each first node
Point is to the communication path between two first nodes in k, wherein 1≤k≤n (n-1)/2, k round numbers.
Step 304：Judge that the communication path whether there is non-shortest path；If in the presence of execution step 305；Otherwise
Perform step 306；
Step 305：Judge to whether there is Section Point on the non-shortest path；If so, the then non-shortest path
For electromagnetic looped network, and perform step 306；Otherwise step 306 is performed.
Step 306：First node is rejected to k, judges whether the number of remaining first node pair is more than 0；If so, then performing
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 is port equivalent impedance schematic diagram between the node of the embodiment of the present invention two, as shown in Figure 5.Between node electrically away from
From definition mode it is a lot, electrical distance is defined as the port equivalent impedance Z between 2 points between node i of the present invention, jij,equ。
In the two-port network that i, j are constituted, unitary current e is inputtedij, with port voltage U between 2 pointsijDivided by electric current eijIt can just obtain
To port equivalent impedance Zij,equ, specifically refer to below equation：
Zij,equ=Uij/eij=Uij(1)；
According to principle of stacking, Two-port netwerk equivalent impedance is represented with node equivalent impedance, and specific node electrical distance is public
Formula is：
Zij,equ=Zii+Zjj-2Zij(2)；
Wherein, Zij,eqRepresent the port equivalent impedance between node i, j, ZiiFor the self-impedance of node i, ZjjFor node j's
Self-impedance, ZijFor the mutual 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：Each Section Point difference in each electromagnetic looped network is determined according to node electrical distance formula
To first node to the distance between two described first nodes in k.
Step 402：Each Section Point is divided between each Section Point according to the minimum rule of distance electric
In isolated island where the minimum first node of gas distance.
Step 403：Judge whether each described Section Point on electromagnetic looped network is all divided into same isolated island, obtain
4th judged result.
Step 404：When the 4th judged 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 Section Point；Work as institute
State the 4th judged result to be expressed as not being divided into same isolated island all, then by connected two in two different isolated islands
The separated off-the-line mode as electromagnetic looped network of the individual Section Point.
Step 500：Off-the-line is carried out to the off-the-line mode according to default time and order is switched.
Because the importance of each link in power network is different, so significance level configuration switch of the present invention according to each link
The time of execution and order, therefore the present invention carries out off-the-line according to default time and order is switched to the off-the-line mode.
Step 600：Each isolated island is handled, it is ensured that each isolated island stable operation.
The isolated island obtained after off-the-line is taken and handled, the processing method is specifically included：Cut machine-cut load, adjustment hair
Electric machine frequency.When being more than load when being generated electricity in isolated island, cut-out generator, when load, which is more than, to generate electricity, excision
Sub-load.When islanded system frequency is bigger than normal or less than normal, generator frequency is adjusted, isolated island frequency stabilization is maintained.
Fig. 6 is adaptive islanding control system construction drawing of the embodiment of the present invention, as shown in fig. 6, the system includes：First
Determining module 1, the 4th determining module 2, the second determining module 3, the 3rd determining module 4, off-the-line module 5, stringent effort take mould
Block 6.
First determining module 1, for when grid collapses, on-line monitoring system unstability, determining that power network needs off-the-line.
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 nodes.
Second determining module 3, for determining electromagnetic looped network according to breadth-first search.Second determining module,
Specifically include：First node is sentenced to determining unit, node determining unit, communication path determining unit, the first judging unit, second
Disconnected unit, the 3rd judging unit, selection unit.
First node is to determining unit, for obtaining n first node, according to n first nodes determine n (n-1)/
2 first nodes pair.
Node determining unit, for using each first node as initial starting point, according to breadth-first search successively
It is determined that the node being connected with each first node.
Communication path determining 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 whether there is non-shortest path, obtains the first judged result.
Second judging unit, during for being when first judged result, judge on the non-shortest path whether
There is Section Point, obtain the second judged result；The Section Point is 220kV nodes.
3rd judging unit, for when first judged result and second judged result are to be, determining institute
Non- shortest path is stated for electromagnetic looped network, and rejects the first node to k, judges whether the number of remaining first node pair is more than
0, obtain the 3rd judged result；When first judged result and described at least one result of second judged result are no, pick
Except the first node is to k, judges whether the number of remaining first node pair is more than 0, obtain the 3rd judged result.
Unit being chosen, during for being when the 3rd judged result, first node is chosen again to k；When the described 3rd
When being as a result no, all electromagnetic looped networks are chosen.
3rd determining module 4, the off-the-line mode for determining electromagnetic looped network according to the electromagnetic looped network.Described 3rd determines
Module, is specifically included：Euclidean distance between node pair determining unit, division unit, the 4th judging unit, electromagnetic looped network off-the-line mode determine list
Member.
Euclidean distance between node pair determining unit, for determining each institute in each electromagnetic looped network according to node electrical distance formula
Section Point is stated respectively to first node to the distance between two described first nodes in k.
The node electrical distance formula is：
Zij,equ=Zii+Zjj-2Zij(2)；
Wherein, Zij,eqRepresent the port equivalent impedance between node i, j, ZiiFor the self-impedance of node i, ZjjFor node j's
Self-impedance, ZijFor the mutual impedance between node i, j.
Division unit, for according to the minimum rule of distance by each Section Point be divided into each Section Point it
Between in isolated island where the minimum first node of electrical distance.
Whether the 4th judging unit, each described Section Point for judging on electromagnetic looped network is all divided into same orphan
In island, the 4th judged result is obtained.
Electromagnetic looped network off-the-line mode determining unit, for being expressed as all being divided into same orphan when the 4th judged result
In island, then need to regard transformer disconnection at the maximum first node of electrical distance between each Section Point as electricity
The off-the-line mode of magnet ring net；When the 4th judged result is expressed as not being divided into same isolated island all, then it will be located at two
The separated off-the-line mode as electromagnetic looped network of connected two Section Point in individual different isolated islands.
Off-the-line module 5, for according to switching the default time and off-the-line sequentially being carried out to the off-the-line mode, obtaining multiple
Isolated island.
Stringent effort take module 6, for handling each isolated island, it is ensured that isolated island stable operation.
Adaptive islanding control method in the present invention is capable of the change of the adaptive system method of operation automatically, either topological
The change of structure or the change of flow state all have fine adaptability.
Case 1：
Adaptive islanding control obtains off-the-line plan by being continuously added constraints in initial decision space, progressively
Slightly.The constraints of consideration has coherent constraints, isolated island power-balance constraint, steady stability constraint etc., three stages based on OBDD
Method can determine that the off-the-line mode between each first node.In practice, disconnection device is generally mounted to high voltage grade to engineering
On circuit, i.e. first node circuit, therefore the three-phase approach based on OBDD can only determine whether first node circuit cut-offs.If
There is electromagnetic looped network between first node-Section Point circuit, and obtained off-the-line strategy just breaks at electromagnetic looped network first
Open, in addition it is also necessary to provide the off-the-line mode of corresponding Section Point circuit.
Fig. 7 gives the connection figure between 7 nodes, by taking Fig. 7 as an example, the present invention using BFS hair search with
The connected node of each first node, it is assumed that V0, V1, V2, V3 are first node, i.e. 500kV nodes, and V4, V5, V6 are second
Node, i.e. 220kV nodes, 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, travels through 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 nodes { V1, V2, V4 } are found in search for the first time；Search for the second time
Rope, finds V2 connected nodes { V0, V1, V5 }, finds V1 connected nodes { V0, V2, V3 }, finds V4 connected nodes { V0, V6 }, removes
The node found is removed, the new node found is searched for for the second time to be had { 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 the communication path between first node internal two first nodes V0, V2 have 3, i.e. V0-V2, V0-V1-V2,
V0-V4-V6-V5-V2, because V0-V4-V6-V5-V2 communication paths are not shortest path and there are 3 Section Points,
V0-V4-V6-V5-V2 is electromagnetic looped network.(because the communication path between V0-V2 and V0-V1-V2 connects between belonging to 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 OBDD three-phase approach
Formula), it similarly can determine that and whether there is electromagnetic looped network between the internal first node of other first nodes.
Calculated respectively between Section Point 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, such as Section Point V4, V6 and V0 it
Between electrical distance it is smaller, illustrate to contact more close between Section Point V4, V6 and V0, then the two nodes be grouped into V0 institutes
In isolated island, the electrical distance between Section Point 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 Section Point V5 and V6.(such as Section Point V4, V5,
Electrical distances of the V6 between V0 is smaller, illustrates that Section Point V4, V5, V6 contact more close between V0, then by this
Where three nodes are grouped into V0 in isolated island, now need to disconnect in the transformer between V2-V5, such case is in actual electric network
Hardly possible to occur, because the impedance very little of transformer, the electrical link between V2, V5 is very close, V5, V6 are power line
Road, impedance is generally large, so V5 can generally belong to V2.).
Case 2：
Specific embodiment in the present invention first, is calculated using Guangdong Power Grid summer big data in 2015 using BFS
The electromagnetic looped network that method finds Guangdong Power Grid is had altogether at 23, and it specifically refers to table 1.
The electromagnetic looped network of the Guangdong Power Grid of table 1
According to table 1, judge whether the node at 23 needs disconnection.The present invention is to be to be deposited between storehouse gulf and the Qujiang River at wherein one
Analyzed exemplified by electromagnetic looped network.If wanting Jiang Kuwan, the Qujiang River to be divided on different isolated islands except disconnecting between the two
First node circuit, in addition it is also necessary to disconnect Section Point circuit.It is specific calculate moon gulf, Longshine, Shaoguan A factories respectively with storehouse gulf,
The electrical distance of Qujiang River node, as shown in Figure 8.
Node and two ends first node electrical distance on the alternate path of table 2
From table 2 and Fig. 8, moon gulf node and storehouse gulf node electrical distance are smaller, contact closer, therefore by the moon
Gulf node is same isolated island with storehouse gulf node division；And bright new node, Shaoguan A factories and Qujiang River electrical distance are smaller, contact is more
Closely, therefore by bright new node, Shaoguan A factories and the Qujiang River it is electrically divided into same isolated island；Because moon gulf node, bright new node,
Shaoguan A factories are Section Point, so needing to will be switched off moon gulf-Longshine double loop and moon gulf-Shaoguan A factories double loop is disconnected
Open.
The embodiment of each in this specification is described by the way of progressive, and what each embodiment was stressed is and other
Between the difference of embodiment, each embodiment identical similar portion mutually referring to.For system disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
Specific case used herein is set forth to the principle and embodiment of the present invention, and above example is said
The bright method and its core concept for being only intended to help to understand the present invention；Simultaneously for those of ordinary skill in the art, foundation
The thought of the present invention, will change in specific embodiments and applications.In summary, this specification content is not
It is interpreted as limitation of the present invention.
Claims (10)
1. a kind of adaptive islanding control method, it is characterised in that the described method comprises the following steps：
When grid collapses, on-line monitoring system unstability, determine that power network 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 default time and off-the-line sequentially being carried out to the off-the-line mode, multiple isolated islands are obtained；
Each isolated island is handled, it is ensured that each isolated island stable operation.
2. adaptive islanding control method according to claim 1, it is characterised in that described according to breadth first algorithm
Determine before electromagnetic looped network step, in addition to：
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 determine each first node
Between off-the-line mode；The first node is 500kV nodes.
3. adaptive islanding control method according to claim 2, it is characterised in that described to be calculated according to BFS
Method determines electromagnetic looped network, and specific steps include：
N first node is obtained, n (n-1)/2 first node pair is determined according to the n first nodes；
Using each first node as initial starting point, determined successively according to breadth-first search and each first node phase
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 whether there is non-shortest path, obtain the first judged result；
When first judged result when being, to judge to whether there is Section Point on the non-shortest path, second is obtained
Judged result；The Section Point is 220kV nodes；
When first judged result and second judged result are to be, it is electromagnetism ring to determine the non-shortest path
Net, and the first node is rejected to k, judge whether the number of remaining first node pair is more than 0, obtain the 3rd judged result；
When first judged result and described at least one result of second judged result are no, the first node is rejected to k, is sentenced
Whether the number of disconnected residue first node pair is more than 0, obtains the 3rd judged result；
When the 3rd judged result for when being, selection first node is to k again；When the 3rd result is no, institute is chosen
Some electromagnetic looped networks.
4. adaptive islanding control method according to claim 3, it is characterised in that described true according to the electromagnetic looped network
Determine the off-the-line mode of electromagnetic looped network, specific steps include：
Determine that each Section Point in each electromagnetic looped network arrives first node to k respectively according to node electrical distance formula
In the distance between two first nodes；
Each Section Point is divided into by the electrical distance minimum between each Section Point according to the minimum rule of distance
In isolated island where the first node；
Judge whether each described Section Point on electromagnetic looped network is all divided into same isolated island, obtain the 4th and judge knot
Really；
When the 4th judged result is expressed as all being divided into same isolated island, then need between each Section Point
Transformer disconnects the off-the-line mode as electromagnetic looped network at the maximum first node of electrical distance；When the described 4th judgement knot
Fruit is expressed as not being divided into same isolated island all, then by connected two second section in two different isolated islands
The separated off-the-line mode as electromagnetic looped network of point.
5. adaptive islanding control method according to claim 4, it is characterised in that the node electrical distance formula
For：
Zij,equ=Zii+Zjj-2Zij(2)；
Wherein, Zij,eqRepresent the port equivalent impedance between node i, j, ZiiFor the self-impedance of node i, ZjjFor hindering certainly for node j
It is anti-, ZijFor the mutual impedance between node i, j.
6. a kind of adaptive islanding control system, it is characterised in that the system includes：
First determining module, for when grid collapses, on-line monitoring system unstability, determining that power network needs off-the-line；
Second determining module, for determining electromagnetic looped network according to breadth-first search；
3rd determining module, the off-the-line mode for determining electromagnetic looped network according to the electromagnetic looped network；
Off-the-line module, for according to switching the default time and off-the-line sequentially being carried out to the off-the-line mode, obtaining multiple isolated islands；
Stringent effort take module, for handling each isolated island, it is ensured that isolated island stable operation.
7. adaptive islanding control system according to claim 6, it is characterised in that true in the first determining module and second
Also include between cover half block：
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 nodes.
8. adaptive islanding control system according to claim 7, it is characterised in that second determining module, specifically
Including：
First node is to determining unit, for obtaining n first node, and n (n-1)/2 is determined according to the n first nodes
First node pair；
Node determining unit, for using each first node as initial starting point, being determined successively according to breadth-first search
The node being connected with each first node；
Communication path determining 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 whether there is non-shortest path, obtains the first judged result；
Second judging unit, during for being when first judged result, judges to whether there is on the non-shortest path
Section Point, obtains the second judged result；The Section Point is 220kV nodes；
3rd judging unit, for when first judged result and second judged result are to be, determining described non-
Shortest path is electromagnetic looped network, and rejects the first node to k, judges whether the number of remaining first node pair is more than 0, obtains
Obtain the 3rd judged result；When first judged result and described at least one result of second judged result are no, institute is rejected
First node is stated to k, judges whether the number of remaining first node pair is more than 0, obtains the 3rd judged result；
Unit being chosen, during for being when the 3rd judged result, first node is chosen again to k；When the 3rd result
For it is no when, choose all electromagnetic looped networks.
9. adaptive islanding control system according to claim 8, it is characterised in that the 3rd determining module, specifically
Including：
Euclidean distance between node pair determining 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 described first nodes in k；
Division unit, it is electric for each Section Point to be divided between each Section Point according to the minimum rule of distance
In isolated island where the minimum first node of gas distance；
Whether the 4th judging unit, each described Section Point for judging on electromagnetic looped network is all divided into same isolated island
It is interior, obtain the 4th judged result；
Electromagnetic looped network off-the-line mode determining unit, for being expressed as all being divided into same isolated island when the 4th judged result
It is interior, then need to regard transformer disconnection at the maximum first node of electrical distance between each Section Point as electromagnetism
The off-the-line mode of looped network；When the 4th judged result is expressed as not being divided into same isolated island all, then it will be located at two
The separated off-the-line mode as electromagnetic looped network of connected two Section Point in different isolated islands.
10. adaptive islanding control system according to claim 9, it is characterised in that the node electrical distance formula
For：
Zij,equ=Zii+Zjj-2Zij(2)；
Wherein, Zij,eqRepresent the port equivalent impedance between node i, j, ZiiFor the self-impedance of node i, ZjjFor hindering certainly for node j
It is anti-, ZijFor the mutual impedance between node i, j.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508315A (en) * | 2017-08-24 | 2017-12-22 | 南京南瑞继保电气有限公司 | The power distribution network isolated island division methods of meter and the equivalent electrical distance in power supply group inside and outside |
| CN107947172A (en) * | 2017-12-18 | 2018-04-20 | 山东大学 | A kind of electric system inertia levels appraisal procedure based on Wide-area Measurement Information |
| CN111371125A (en) * | 2020-01-17 | 2020-07-03 | 武汉大学 | Splitting and grouping optimization method for improving system coherence under condition of considering fan access |
| CN112398135A (en) * | 2020-11-30 | 2021-02-23 | 国网冀北电力有限公司电力科学研究院 | Control method and device of multi-port power electronic transformer of anti-electromagnetic looped network |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106803679A (en) * | 2015-11-26 | 2017-06-06 | 国网智能电网研究院 | A kind of flexible ring net controller and control method for electromagnetic looped network solution inscription of loop |
-
2017
- 2017-06-09 CN CN201710433394.3A patent/CN107017635B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106803679A (en) * | 2015-11-26 | 2017-06-06 | 国网智能电网研究院 | A kind of flexible ring net controller and control method for electromagnetic looped network solution inscription of loop |
Non-Patent Citations (2)
| Title |
|---|
| 刘源祺: ""基于广域测量信息的电力系统解列研究"", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
| 沈沉等: ""电力系统主动解列控制方法的研究"", 《中国电机工程学报》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508315A (en) * | 2017-08-24 | 2017-12-22 | 南京南瑞继保电气有限公司 | The power distribution network isolated island division methods of meter and the equivalent electrical distance in power supply group inside and outside |
| CN107508315B (en) * | 2017-08-24 | 2019-09-27 | 南京工程学院 | The power distribution network isolated island division methods of meter and the equivalent electrical distance in power supply group inside and outside |
| CN107947172A (en) * | 2017-12-18 | 2018-04-20 | 山东大学 | A kind of electric system inertia levels appraisal procedure based on Wide-area Measurement Information |
| CN107947172B (en) * | 2017-12-18 | 2023-11-21 | 山东大学 | Power system inertia level assessment method based on wide area information |
| CN111371125A (en) * | 2020-01-17 | 2020-07-03 | 武汉大学 | Splitting and grouping optimization method for improving system coherence under condition of considering fan access |
| CN112398135A (en) * | 2020-11-30 | 2021-02-23 | 国网冀北电力有限公司电力科学研究院 | Control method and device of multi-port power electronic transformer of anti-electromagnetic looped network |
| CN112398135B (en) * | 2020-11-30 | 2023-12-05 | 国网冀北电力有限公司电力科学研究院 | Control method and device for multi-port power electronic transformer of anti-electromagnetic ring network |
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Effective date of registration: 20230922 Address after: 510000 No. 75, Meihua Road, Yuexiu District, Guangzhou City, Guangdong Province (office building only) Patentee after: ELECTRICAL POWER DISPATCHING & CONTROL CENTER OF GUANGDONG POWER GRID Co.,Ltd. Address before: No.75, Meihua Road, Yuexiu District, Guangzhou, Guangdong 510000 Patentee before: ELECTRICAL POWER DISPATCHING & CONTROL CENTER OF GUANGDONG POWER GRID Co.,Ltd. Patentee before: TSINGHUA University |