CN108365604A - A kind of two benches distribution network failure restoration methods counted and microgrid accesses - Google Patents
A kind of two benches distribution network failure restoration methods counted and microgrid accesses Download PDFInfo
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- CN108365604A CN108365604A CN201810173268.3A CN201810173268A CN108365604A CN 108365604 A CN108365604 A CN 108365604A CN 201810173268 A CN201810173268 A CN 201810173268A CN 108365604 A CN108365604 A CN 108365604A
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of meter and the two benches distribution network failure restoration methods of microgrid access.The present invention devises a kind of two benches fault recovery method including piconet island operation reserve and Distribution Networks Reconfiguration using the microgrid of access power distribution network, obtains more reasonably fault recovery scheme, is implemented as follows：After step (1) failure occurs, dynamic topology scanning is carried out to distribution network, to obtain dead electricity region；Step (2) generates islet operation strategy in dead electricity region, using microgrid；After step (3) islet operation strategy generating, network topology matrix is updated, network reconfiguration is carried out to remaining network dead electricity region；The present invention realize utmostly, most rapidly fault recovery, ensured power supply reliability, improved user satisfaction.
Description
Technical field
The present invention relates to distribution network failure recoveries, belong to intelligent grid, distribution automation field, and in particular to it is a kind of meter and
The two benches distribution network failure restoration methods of microgrid access.
Technical background
The country of support and development with to(for) new energy industry, more and more distributed news are in the form of microgrid
It is linked into medium voltage distribution network.It includes diversified forms distributed energy (wind-force, photovoltaic, cogeneration unit etc.) that microgrid, which is one,
Organic combination realizes effective consumption to clean energy resource by the scheduling and optimization of internal system, while can be with power distribution network
It carries out energetic interaction and realizes economical operation.Although microgrid have many advantages, such as cleaning, it is economical, give power distribution network operation and maintenance
Bring challenge.Traditionally the topological structure of medium voltage distribution network (10Kv-35KV) is radial, direction of tide be it is unidirectional,
Relay protection and the method for operation are relatively simple.However, after microgrid accesses medium voltage distribution network, the direction of tide of power distribution network just becomes
It is two-way, bring difficulty to distribution network operation.Distribution network failure restores to be a project particularly important in distribution network operation, passes
Fault recovery target is exactly after power outage generation, by turning the load in tape jam region to other feeder lines while not on system
The constraints of system is violated, thus the amount of restoring electricity, substantially a network reconfiguration problem as much as possible.Microgrid accesses
Afterwards, energetic interaction can be carried out with power distribution network, from the perspective of fault recovery, its distributed power generation can be utilized to contribute, come
Support fault recovery.Specifically, the present invention using piconet island run the characteristics of, while with traditional network reconstruction method phase
In conjunction with a kind of two stage distribution network failure restoration methods of formation can more restore load, improve power supply reliability.
The method that the present invention designs has highly important theoretical and realistic meaning in practice.
Invention content
The problem to be solved in the present invention is to overcome deficiency in the prior art, provides a kind of two ranks counted and microgrid accesses
Section distribution network failure restoration methods.It includes piconet island operation reserve that the present invention is devised a kind of using the microgrid of access power distribution network
With the two benches fault recovery method of Distribution Networks Reconfiguration, more reasonably fault recovery scheme is obtained.Realize utmostly,
Most rapidly fault recovery, has ensured power supply reliability, improves user satisfaction.
To solve technical problem, solution of the invention is：
After step (1) failure occurs, dynamic topology scanning is carried out to distribution network, to obtain dead electricity region；
Step (2) generates islet operation strategy in dead electricity region, using microgrid；
After step (3) islet operation strategy generating, network topology matrix is updated, net is carried out to remaining network dead electricity region
Network reconstructs；
In the present invention, the step (1) is accomplished in the following manner：
Distribution network topology is considered as a depth map by putting and side is constituted, by net in the way of node depth coding
Network network topology storage is in a matrix of depths.The depth at each node can be obtained by the method for breadth first search
And adjacent node.Detailed process is as follows：
1-1. obtains topology information CIM files from distribution scheduling system, reads busbar, transformer, load in file
The information I of reading is considered as the point in depth map, V={ v is expressed as with the form of set by the information such as node I1,v2,...,vn}；
The information II such as switch, circuit in file are read, the information II of reading is considered as the side in depth map, is E=with set expression
{e1,e2,...,en}。
1-2. utilizes breadth first search, to V={ v1,v2,...,vnAnd E={ e1,e2,...,enScan for, it obtains
To matrix of depthsWherein D indicates that node depth, node 1 indicate that root node, depth are set to 0.vd1
It is expressed as the node corresponding to depth d1.
1-3. obtains faulty line e by depth-first searchfAnd its child node set Vf={ vf1,vf2,...,vfn,
As fault outage region.Wherein vfnFor the load bus number in power supply interrupted district.
In the present invention, the step (2) is accomplished in the following manner：
Include various distributed news, such as wind-force, photovoltaic, cogeneration unit in microgrid.It is general, and there are two types of fortune
Row pattern, is incorporated into the power networks and islet operation.Under islet operation pattern, microgrid is using the generating set of itself to local load
It is powered, even if higher level's distribution network line breaks down, also can guarantee the continued power of user.The specific algorithm that isolated island divides
It is as follows：
2-1. failure judgement power supply interrupted districts Vf={ vf1,vf2,...,vfnIn whether contain microgrid, if entering comprising if
Otherwise islet operation enters step (3), network reconfiguration.
2-2. searches for the microgrid in fault outage region, big according to load using it as the power supply of islet operation point
Small to be incorporated within the scope of islet operation, object function is so that restoring load maximum, while meeting node voltage constraint
It is constrained with Branch Power Flow, mathematical model is：
In formula：cvFor the load important level of node, xvIndicate whether load bus v is selected within the scope of operation isolated island,
N indicates the number of all nodes in fault zone；SiIndicate that i-th of the isolated island set formed in fault zone, G indicate that microgrid connects
Ingress set, Si\(Si∩ G) it indicates to remove the set of microgrid access node in i-th of isolated island；dvIndicate that node v's is active negative
Lotus size；Indicate the network active loss size in i-th of isolated island；VvIndicate the voltage magnitude size of node v,The bound of node voltage amplitude is indicated respectively；Indicate branch avIn the size of current that flows through,Indicate branch
Road avIn the upper limit of size of current that flows through.
Mathematical model described in 2-3. steps 2-2 is a mixed integer optimization, is solved to it using branch and bound method.Make
The optimal solution that can be obtained above-mentioned model is solved with optimization solver CPLEX.
In the present invention, the step (3) is accomplished in the following manner：
After isolated island division being carried out using microgrid, it is understood that there may be the load point of islet operation can not be included in.For these loads
Point considers that the mode of network reconfiguration carries out the recovery of second stage to it, that is, utilizes block switch and interconnection switch in power distribution network
Folding load point is connected to power available point.It is as follows：
3-1. investigates fault outage region Vf={ vf1,vf2,...,vfn, remove those from fault outage region
Node in piconet island range of operation obtains the load bus set for waiting for network reconfiguration
3-2. carries out network reconfiguration mathematical modeling for load bus set to be reconstructed, and object function is the load restored
Amount is maximum, and the constraints of consideration has the radial constraint of trend constraint, topology and the constraint of capacity of trunk restraint joint voltage.Tool
Body is as follows：
In formula：ciIndicate the load important level of node i, PDiIndicate the burden with power size of node i；PijIndicate branch ij
In the active power size that flows through, αijIndicate the folding condition of branch ij, αij=1 indicates to be closed, αij=0 indicates to disconnect；gijTable
Show the conductance size of branch ij, bijIndicate the susceptance size of branch ij, ViIndicate the voltage magnitude of node i；θijIndicate branch ij
Generator rotor angle size；ΩlIndicate all set of fingers in network.
3-3. solves above-mentioned network reconfiguration model using binary particle swarm algorithm, specific as follows：
1. inputting particle cluster algorithm parameter, including population scale N, inertia coeffeicent w etc.；
2. initializing a particle position and speed in population；
3. updating its position and speed to each particle；
4. calculating distribution power flow using forward-backward sweep method, the fitness of each particle is obtained；
5. fitness meets the condition of convergence, stop calculating.
After the present invention is in view of microgrid access, the trend and topology of power distribution network can all generate larger change.Therefore it devises
A kind of two benches fault recovery method, the first stage judge fault zone in microgrid node, make it into island operation state,
It establishes isolated island to divide mathematical model and be translated into a mixed integer programming problem, and is subject to using the method for branch-and-bound
It solves；The method that second stage uses network reconfiguration is powered recovery to remaining load bus to be restored, establishes power distribution network
Mathematical model is reconstructed, is up to object function to restore load, is solved using binary particle swarm algorithm.It finally obtains
Two benches fault recovery improves power supply reliability and user satisfaction as a result, farthest reduce dead electricity load.
Description of the drawings
Fig. 1 is two benches fault recovery flow chart in the present invention.
Specific implementation mode
The principle of the present invention and specific execution method are described below in conjunction with attached drawing.
The two benches distribution network failure restoration methods for providing a meter and microgrid, include the following steps：
(1) after failure occurs, dynamic topology scanning is carried out to distribution network, to obtain dead electricity region；
(2) stage one generates islet operation strategy in dead electricity region using microgrid；
(3) stage two after islet operation strategy generating, update network topology matrix, to remaining network dead electricity region into
Row network reconfiguration；
In the present invention, the step (1) is accomplished in the following manner：
Distribution network topology is considered as a depth map by putting and side is constituted, by net in the way of node depth coding
Network network topology storage is in a matrix of depths.The depth at each node can be obtained by the method for breadth first search
And adjacent node.Specific algorithm flow is as follows：
(a) topology information CIM files are obtained from distribution scheduling system, read busbar, transformer, load section in file
Information, the points being regarded as in depth map such as point are expressed as V={ v with the form of set1,v2,...,vn}；It reads in file and opens
The information such as pass, circuit are regarded as the side in depth map, are E={ e with set expression1,e2,...,en}。
(b) breadth first search is utilized, to V={ v1,v2,...,vnAnd E={ e1,e2,...,enScan for, it obtains
Matrix of depthsWherein D indicates that node depth, node 1 indicate that root node, depth are set to 0.vd1Table
It is shown as the node corresponding to depth d1.
(c) by depth-first search, faulty line e is obtainedfAnd its child node set Vf={ vf1,vf2,...,vfn, i.e.,
For fault outage region.vfnFor the load bus number in power supply interrupted district.
In the present invention, the step (2) is accomplished in the following manner：
Include various distributed news, such as wind-force, photovoltaic, cogeneration unit in microgrid.It is general, and there are two types of fortune
Row pattern, is incorporated into the power networks and islet operation.Under islet operation pattern, microgrid is using the generating set of itself to local load
It is powered, even if higher level's distribution network line breaks down, also can guarantee the continued power of user.The specific algorithm that isolated island divides
It is as follows：
(a) failure judgement region Vf={ vf1,vf2,...,vfnIn whether contain microgrid, if comprising if enter isolated island transport
Otherwise row enters stage two, network reconfiguration.
(b) search for the microgrid in fault zone, using it as the power supply of islet operation point, according to payload by its
It incorporates within the scope of islet operation, mathematical model is：
In formula：cvFor the load important level of node, xvIndicate whether load bus v is selected within the scope of operation isolated island,
N indicates the number of all nodes in fault zone；SiIndicate that i-th of the isolated island set formed in fault zone, G indicate that microgrid connects
Ingress set, Si\(Si∩ G) it indicates to remove the set of microgrid access node in i-th of isolated island；dvIndicate that node v's is active negative
Lotus size；Indicate the network active loss size in i-th of isolated island；VvIndicate the voltage magnitude size of node v,The bound of node voltage amplitude is indicated respectively；Indicate branch avIn the size of current that flows through,Indicate branch
Road avIn the upper limit of size of current that flows through.
(c) above-mentioned mathematical model is a mixed integer optimization, and the present invention solves it using branch and bound method.Using excellent
Change solver CPLEX and solves the optimal solution that can be obtained above-mentioned model.
In the present invention, the step (3) is accomplished in the following manner：
After isolated island division being carried out using microgrid, it is understood that there may be the load point of islet operation can not be included in.For these loads
Point considers that the mode of network reconfiguration carries out the recovery of second stage to it, that is, utilizes block switch and interconnection switch in power distribution network
Folding load point is connected to power available point.Specific steps and algorithm are as follows：
(a) fault zone V is investigatedf={ vf1,vf2,...,vfn, therefrom remove those in piconet island range of operation
Interior node obtains the load bus for waiting for network reconfiguration
(b) network reconfiguration mathematical modeling is carried out for load bus to be reconstructed, it is specific as follows：
In formula：ciIndicate the load important level of node i, PDiIndicate the burden with power size of node i；PijIndicate branch ij
In the active power size that flows through, αijIndicate the folding condition of branch ij, αij=1 indicates to be closed, αij=0 indicates to disconnect；gijTable
Show the conductance size of branch ij, bijIndicate the susceptance size of branch ij, ViIndicate the voltage magnitude of node i；θijIndicate branch ij
Generator rotor angle size；ΩlIndicate all set of fingers in network.
(c) binary particle swarm algorithm is used to solve above-mentioned network reconfiguration model, it is specific as follows：
1. inputting particle cluster algorithm parameter, including population scale N, inertia coeffeicent w etc.；
2. initializing a particle position and speed in population；
3. updating its position and speed to each particle；
4. calculating distribution power flow using forward-backward sweep method, the fitness of each particle is obtained；
5. fitness meets the condition of convergence, stop calculating.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in
Within protection scope of the present invention.
Claims (3)
1. a kind of meter and the two benches distribution network failure restoration methods of microgrid access, it is characterised in that include the following steps：
After step (1) failure occurs, dynamic topology scanning is carried out to distribution network, to obtain dead electricity region；
Step (2) generates islet operation strategy in dead electricity region, using microgrid；
After step (3) islet operation strategy generating, network topology matrix is updated, network weight is carried out to remaining network dead electricity region
Structure；
In the present invention, the step (1) is accomplished in the following manner：
Distribution network topology is considered as one by the depth map put and side is constituted, is opened up network in the way of node depth coding
It flutters and is stored in a matrix of depths；By the method for breadth first search can obtain depth at each node and
Adjacent node, detailed process are as follows：
1-1. obtains topology information CIM files from distribution scheduling system, reads busbar, transformer, load bus in file
Etc. information I, the information I of reading is considered as the point in depth map, V={ v are expressed as with the form of set1, v2..., vn}；It reads
The information II of reading is considered as the side in depth map, is E={ e with set expression by the information such as switch, circuit II in file1,
e2..., en}；
1-2. utilizes breadth first search, to V={ v1, v2..., vnAnd E={ e1, e2..., enScan for, obtain depth
Spend matrixWherein D indicates that node depth, node 1 indicate that root node, depth are set to 0；vd1It indicates
For the node corresponding to depth d1；
1-3. obtains faulty line e by depth-first searchfAnd its child node set Vf={ vf1,vf2,...,vfn, as
Fault outage region；Wherein vfnFor the load bus number in power supply interrupted district.
2. a kind of meter according to claim 1 and the two benches distribution network failure restoration methods of microgrid access, feature exist
It is accomplished in the following manner in step (2)：
Include various distributed news, such as wind-force, photovoltaic, cogeneration unit in microgrid；It is general, and there are two types of run mould
Formula, is incorporated into the power networks and islet operation；Under islet operation pattern, microgrid carries out local load using the generating set of itself
Power supply, even if higher level's distribution network line breaks down, also can guarantee the continued power of user；The specific algorithm that isolated island divides is such as
Under：
2-1. failure judgement power supply interrupted districts Vf={ vf1, vf2..., vfnIn whether contain microgrid, if comprising if enter isolated island transport
Row, otherwise enters step (3), network reconfiguration；
2-2. searches for the microgrid in fault outage region, will according to payload using it as the power supply of islet operation point
It is incorporated within the scope of islet operation, and mathematical model is：
xv=1, v ∈ G
xv={ 0,1 }, v ∈ V G
In formula：cvFor the load important level of node, xvIndicate whether load bus v is selected within the scope of operation isolated island, n tables
Show the number of all nodes in fault zone；SiIndicate that i-th of the isolated island set formed in fault zone, G indicate microgrid access
Node set, Si\(Si∩ G) it indicates to remove the set of microgrid access node in i-th of isolated island；dvIndicate the burden with power of node v
Size；Indicate the network active loss size in i-th of isolated island；VvIndicate the voltage magnitude size of node v,
The bound of node voltage amplitude is indicated respectively；Indicate branch avIn the size of current that flows through,Indicate branch avIn flow through
Size of current the upper limit；
Mathematical model described in 2-3. steps 2-2 is a mixed integer optimization, is solved to it using branch and bound method；Using excellent
Change solver CPLEX and solves the optimal solution that can be obtained above-mentioned model.
3. a kind of meter according to claim 2 and the two benches distribution network failure restoration methods of microgrid access, feature exist
It is accomplished in the following manner in step (3)：
After isolated island division being carried out using microgrid, it is understood that there may be the load point of islet operation can not be included in；For these load points, examine
The mode for considering network reconfiguration carries out it recovery of second stage, that is, utilizes the folding of block switch and interconnection switch in power distribution network
Load point is connected to power available point；It is as follows：
3-1. investigates fault outage region Vf={ vf1,vf2,...,vfn, remove those from fault outage region in microgrid
Node within the scope of islet operation obtains the load bus set for waiting for network reconfiguration
3-2. carries out network reconfiguration mathematical modeling for load bus set to be reconstructed, object function be the load of recovery most
Greatly, the constraints of consideration has the radial constraint of trend constraint, topology and the constraint of capacity of trunk restraint joint voltage, specifically such as
Under：
Qi=∑ αij[-bijVi 2+ViVj(bij cosθij-gij sinθij)]
Si≤Simax
Uimin≤Ui≤Uimax
In formula：ciIndicate the load important level of node i, PDiIndicate the burden with power size of node i；PijIt indicates to flow in branch ij
The active power size crossed, αijIndicate the folding condition of branch ij, αij=1 indicates to be closed, αij=0 indicates to disconnect；gijIndicate branch
The conductance size of road ij, bijIndicate the susceptance size of branch ij, ViIndicate the voltage magnitude of node i；θijIndicate the work(of branch ij
Angle size；ΩlIndicate all set of fingers in network；
3-3. solves above-mentioned network reconfiguration model using binary particle swarm algorithm, specific as follows：
1. inputting particle cluster algorithm parameter, including population scale N, inertia coeffeicent w etc.；
2. initializing a particle position and speed in population；
3. updating its position and speed to each particle；
4. calculating distribution power flow using forward-backward sweep method, the fitness of each particle is obtained；
5. fitness meets the condition of convergence, stop calculating.
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| CN111401660A (en) * | 2020-04-10 | 2020-07-10 | 国网上海市电力公司 | Method for determining radial topology in power distribution system recovery process |
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| CN109861283A (en) * | 2019-02-25 | 2019-06-07 | 南方电网科学研究院有限责任公司 | A kind of urgent isolated island division methods of two stages formula power distribution network |
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| CN110401183A (en) * | 2019-03-12 | 2019-11-01 | 天津大学 | A kind of toughness method for improving based on the reconstruct of distribution system two stages |
| CN109861199A (en) * | 2019-03-20 | 2019-06-07 | 湖南大学 | A kind of fault recovery method in DC distribution net |
| CN111401660A (en) * | 2020-04-10 | 2020-07-10 | 国网上海市电力公司 | Method for determining radial topology in power distribution system recovery process |
| CN111401660B (en) * | 2020-04-10 | 2024-04-26 | 国网上海市电力公司 | Method for determining radial topology in power distribution system recovery process |
| CN112217209A (en) * | 2020-10-22 | 2021-01-12 | 国网天津市电力公司 | Method for checking low-voltage topological structure according to household meter power failure event |
| CN112564097A (en) * | 2020-12-01 | 2021-03-26 | 国网浙江杭州市富阳区供电有限公司 | Method for rapidly recovering load and reducing loss during multi-circuit line fault power failure |
| CN112564097B (en) * | 2020-12-01 | 2022-07-08 | 国网浙江杭州市富阳区供电有限公司 | Method for rapidly recovering load and reducing loss during multi-circuit line fault power failure |
| CN112886573A (en) * | 2021-01-25 | 2021-06-01 | 浙江大学 | Power system recovery method and device considering operation performance |
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