CN103488892A - Electrical island fast tracking analysis method for serving novel wide-area backup protection - Google Patents
Electrical island fast tracking analysis method for serving novel wide-area backup protection Download PDFInfo
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Abstract
The invention relates to an electrical island fast tracking analysis method for serving novel wide-area backup protection. According to the method, on the basis of utilizing a synchronized phasor measurement unit in a wide-area measurement system to collect displacement information of switches in a power grid in real time, the electrical island fast tracking analysis method based on a tree branch-bus incidence matrix is utilized to achieve analysis of buses in plant stations in a parallel mode, then the electrical island fast tracking analysis method based on a rule matching acceleration algorithm is utilized to achieve analysis of system network topology between the plant stations, and therefore, fast analysis is performed on the whole power grid topological structure. Compared with the traditional method, the electrical island fast tracking analysis method greatly reduces calculation of electrical island fast tracking analysis, can meet requirements for instantaneity and accuracy of network topology analysis of a power system, and creates advantages for the novel wide-area backup protection. Furthermore, the electrical island fast tracking analysis method has the advantages of being clear in thought and simple in principle.
Description
Technical field
The present invention relates to a kind of quick trace analysis method in electric island of serving wide area backup protection, belong to the power transmission and distribution technical field.
Background technology
Electrical network analysis is an important common base module in energy management system (EMS) and distribution management system (DMS), is the physical basis that all kinds of electric system such as state estimation, idle work optimization, short circuit calculation and stability analysis high-level software carries out analytical calculation.The computing velocity of network analysis directly has influence on the response speed of whole advanced applied software system.Network analysis will played the part of more and more important basic role aspect the real-time control that guarantee whole electric system and safe operation fast and accurately.
The power system network structure analysis generally is divided into the plant stand inner structure and analyzes and the quick trace analysis two parts in electric island.Along with protecting electrical power system with control progressively by off-line or local real time implementation to the real time implementation of overall angle and transition and the development of super real time implementation, become as the power network topology express-analysis of obtaining the current network physical topological structure research field that need to again be examined closely.Traditional power network topology analysis is based on RTU(remote terminal control system) the switch remote signalling information that provides, comprise that according to graph theory search procedure and matrix method are in interior connectedness judgement principle, and on the basis in conjunction with the power system component characteristic, by in plant stand between bus analysis and plant stand electric island analyze the topological analysis in two stages, complete initial topology analysis and the switch changed position of electric power networks are followed the tracks of, and analysis result is uploaded to relevant higher management software processing in time.Yet in existing EMS or DMS; it is all to be completed by control center that electric island between the analysis of plant stand inner structure and plant stand is analyzed; development along with intelligent grid; bus analysis in each plant stand that walked abreast; and result is submitted to intelligent grid control center; and then the hierarchical distributed networks topology model construction mode of carrying out Network Topology Analysis between plant stand will be conducive to the power system security supervision and the real-time realized is controlled in protection, can effectively alleviate the load processing intensity of control center simultaneously.Correspondingly; although wide area backup protection has utilized 0.5 second intrinsic on the back-up protection principle design and above time delay, electric power networks topology identification more fast and accurately certainly will be conducive to wide area backup protection and process decision center comprehensively grasping in time current electric network composition.Compared to the 4s Refresh Data cycle once in the EMS/RTU measuring system; synchronous phasor measurement unit in the WAMS/PMU(WAMS) in, the synchrodata uploading rate of per second 100 frames (or 50 frames or 25 frames) is having more advantage aspect the real-time that guarantees Electric network analysis and rapidity, and real-time therefore how to utilize PMU information to promote electric network analysis as new data source becomes one of research required content of paying close attention to of novel back-up protection system based on wide area measurement information.
Summary of the invention
The object of the invention is to the drawback for prior art; a kind of quick trace analysis method in electric island of serving new type of wide-area backup protection is provided; with express-analysis and the switch changed position of realizing topological structure of electric, follow the tracks of, for new type of wide-area backup protection provides data.
Problem of the present invention realizes with following technical proposals:
A kind of quick trace analysis method in electric island of serving new type of wide-area backup protection; in the synchronous phasor measurement unit Real-time Collection electric power networks of described method in utilizing WAMS on the basis of the displacement information of each switch; at first adopt the bus analysis walked abreast in each plant stand based on the tree-quick trace analysis method in electric island of bus incidence matrix; then adopt the quick trace analysis method in electric island of rule match accelerating algorithm to complete Network Topology Analysis between plant stand, thereby realize the express-analysis to whole topological structure of electric.
The above-mentioned quick trace analysis method in electric island of serving new type of wide-area backup protection, the concrete grammar that carries out bus analysis in plant stand is as follows:
A. by " opening ", to " closing ", while making in plant stand to increase a branch road, if under "On" state, newly-increased branch road two ends bus belongs to same electric island to certain switch in plant stand, and newly-increased branch road is chord; Otherwise newly-increased branch road, for tree, goes to step d;
B. when the interior connection bus of plant stand
and bus
branch road
on switch by " closing " to " opening ", make branch road
during disconnection, if branch road
be chord, do not affect the division on electric island, this branch road in the chord set is deleted and gets final product, go to step d;
C. when the interior connection bus of plant stand
and bus
branch road
on switch by " closing " to " opening ", make branch road
during disconnection, if branch road
be tree, electric island separation case is not clear, deletes element in tree Zhi Jihe
after, need to further do following processing:
1. investigate the corresponding tree graph of electrical network, find branch road
two groups of set that after disconnecting, bus is divided into, obtain and bus
bus set by tree Zhi Xianglian
and and bus
bus set by tree Zhi Xianglian
;
If 2. can be in the chord set
in find such chord, the one side bus the set
in, the opposite side bus is in set
in, bus so
with bus
still belong to same electric island, redefine this chord for tree, go to step d;
If 3. in the chord set
in do not have above-mentioned chord, electric island will be separated into two electric islands of son, forward steps d to;
D. according to the increase and decrease of branch road and deciliter situation on electric island, revise electric island, bus numbering and tree Zhi Lianzhi set, complete the quick trace analysis in electric island.
The above-mentioned quick trace analysis method in electric island of serving new type of wide-area backup protection, the concrete grammar that carries out Network Topology Analysis between plant stand is as follows:
A. work as branch road
by " opening ", to " closing ", while making between plant stand to increase a branch road, if under "On" state, newly-increased branch road two ends bus belongs to same electric island, and so electric island number is constant, and new branch road is defined as to chord; If under "On" state, newly-increased branch road two ends bus belongs to two electric islands, and two different electric islands are merged into an electric island;
B. work as connection bus
and bus
branch road
on switch by " closing " to " opening ", make branch road between plant stand
during disconnection, if branch road
be chord, electric island is constant; If
for tree, investigate its respective path set
whether be empty set, if
for empty set, separate on electric island; If
not empty set, will
in corresponding bang path, a contained chord is decided to be new tree and props up;
C. according to the increase and decrease of branch road and deciliter situation on electric island, revise electric island, bus numbering and tree Zhi Lianzhi set:
If 1. a newly-increased branch road, be that empty tree Zhi Jinhang searches for again to all set of paths, give the corresponding set of paths that makes new advances; If newly-increased branch road
tree, except being, empty tree Zhi Jinhang searches for again, also will increase its corresponding set of paths to set of paths
, and revise corresponding tree Zhi Lianzhi set;
If 2. reduce by a branch road:
1), if this branch road is chord, revise the chord set;
2) if this branch road is tree, and cause electric island to separate, respectively the bus in the two ends bus set of this tree is numbered, and again form on this basis tree and chord set;
3) if this branch road is tree, but electric island does not have separation, a chord in the respective path set of this tree is updated to new tree and props up, and the upper corresponding set of paths of coupling.
The above-mentioned quick trace analysis method in electric island of serving new type of wide-area backup protection; determine when tree props up corresponding set of paths; if certain tree corresponding set of paths has many bang paths that this branch road two ends bus is connected; in search procedure; stop subsequent searches after finding article one, make in each set of paths to only have at most a satisfactory bang path.
The above-mentioned quick trace analysis method in electric island of serving new type of wide-area backup protection, while carrying out between plant stand Network Topology Analysis, electric island, bus numbering and tree Zhi Lianzhi set be revised as off-line process, all the other are the on-line analysis process.
The present invention adopts the impact of the quick trace analysis method judgement in the electric island based on prop up-bus incidence matrix of tree branch breaking event, utilizes the search accelerating algorithm of rule-based coupling to realize the quick trace analysis on electric island.By the combination of on-line analysis process and off-line process, guarantee the real-time that topological structure of electric analysis and switch changed position are followed the tracks of.With traditional method, compare, this method greatly reduces the operand of the quick trace analysis in electric island, can meet real-time and accuracy requirement that electric system is analyzed network topology, for new type of wide-area backup protection has been created advantage.In addition, this method also has clear thinking, advantage simple to operate.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is 10 meshed networks;
Fig. 2 is based on the quick trace analysis process flow diagram in electric island of prop up-bus incidence matrix of tree;
Fig. 3 is the quick trace analysis process flow diagram in electric island that adopts the rule match accelerating algorithm;
Fig. 4 is topological Image Tracking Algorithms Performance test network;
Fig. 5 is a certain normal branch road;
Fig. 6 is a certain fault branch.
In literary composition, each symbol is: EMS, energy management system, and DMS, distribution management system, RTU, remote terminal control system, WAMS, WAMS, PMU, synchronous phasor measurement unit,
, connection bus
and bus
branch road,
, the chord set,
,
set of paths.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.Should be emphasized that, following explanation is only exemplary, rather than in order to limit scope of patent protection of the present invention.
The quick trace analysis method in electric island that the present invention proposes, gordian technique is by prop up-bus relation integration of tree, directly judge the separation case on electric island by searching for qualified chord, Fig. 2 is the quick trace analysis process flow diagram in electric island based on prop up-bus incidence matrix of tree.In the search procedure of rule-based coupling, the mode that processed offline combines with on-line analysis can effectively improve the speed of the quick trace analysis in electric island, and Fig. 3 is for adopting the quick trace analysis process flow diagram in electric island of rule match accelerating algorithm.
Fig. 4 is the performance test network of topological track algorithm, in network mark the tree, chord set (wherein, mark
for tree, all the other are chord).Considering that chord cut-offs has no significant effect electric island and bus, and we cut-off situation by selective analysis tree.
Situation 1: tree
cut-off
Suppose circuit between bus 2 and bus 3
disconnect, utilize the tree search procedure to determine the bus set be communicated with bus 2 through other trees
, and the bus set be communicated with bus 3 through other trees
.Further, in the chord set
middle search branch road, require an end bus of such branch road to belong to set
, other end bus belongs to set
once, search out so such branch road illustrate that present tree gets out and have no progeny, still exist other branch roads and can connect two parts subtree, electric island can not separated, otherwise judges that electric island separates.
In this case, corresponding chord set
, as shown in table 1.According to condition, judge chord
meet the requirements, therefore tree
disconnect and do not cause electric island to be separated, simultaneously by chord
be appointed as new tree and prop up, and put into tree Zhi Jihe.
The chord set of table 1. test network
| The chord numbering | First node | End-node |
| 1 | 2 | 6 |
| 2 | 1 | 3 |
| 3 | 4 | 9 |
Situation 2: tree
cut-off
If circuit between bus 3 and 4
disconnect, corresponding bus set
,
, after the set of traversal chord, do not deposit at one end bus and belong to set
, other end bus belongs to set
chord, judge the tree
disconnect, caused electric island to be separated, result is gathered exactly
between median generatrix and bus thereof, branch road forms an electric island, set
between median generatrix and bus thereof, branch road forms another electric island, further revises electric island numbering and bus numbering again.
On the upper once basis that topology completes, by the off-line procedure search, obtained in the Exist Network Structure situation, each tree corresponding set of paths, the formation rule storehouse, as shown in table 2.So, enter the search procedure of rule-based coupling.
Table 2. set of paths element forms
Tree
 |
Set of paths:
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
Situation 1: tree
disconnect
1. on-line analysis: because
not empty, so electric island is constant, and by the chord in set of paths
be defined as new tree and prop up, upload the result that electric island is divided;
2. off-line is followed the tracks of: revise tree Zhi Lianzhi set, and prop up to new tree
mix corresponding set of paths
.
Situation 2: tree
disconnect
1. on-line analysis: because
for empty set, separate on therefore electric island; Travel through other bus by its tree Zhi Zhilu again and obtain the bus set
,
form a new electric island, remaining bus set
form another new electric island;
2. off-line is followed the tracks of: bus and branch road automatic numbering with incremental order to each new electric island, the new bus that finally can obtain two new electric islands is numbered, then revises tree and prop up and the chord set on the basis of new bus numbering.
Situation 3: when the chord set
in any chord disconnect
1. on-line analysis: electric island, bus set are all constant;
2. off-line is followed the tracks of: the chord of disconnection is removed from the chord set, and simultaneously, other tree corresponding set of paths that will contain this chord are upgraded, and are again formed.
Analytical approach in the present invention and the computational complexity of traditional search procedure are more as shown in table 3.For the search accelerator of utilizing rule match, need off-line to build the several set of paths of tree lattice framing, the set of paths number is consistent with a tree scale, for
individual.Online part is mainly coupling and search, and off-line is partly wanted the pathway set, and such combination can guarantee the rapidity of online topological analysis to greatest extent.
Table 3. algorithm computational complexity relatively
| Index | The maximum way of search | The wall scroll branch road is searched for maximum matching section and is counted |
| The inventive method | 1～0.5n+1 | 2*floor(0.5n) |
| The tradition search procedure | n～1.5n | n |
Annotate: n is the interstitial content in network, floor (
) representative to getting, be less than or equal to
maximum integer.
On the basis of the quick trace analysis in above fast and effeciently electric island, in order to ensure the normal operation of new type of wide-area backup protection system, require can to realize localization of fault accurately and reliably.When system is normally moved, according to Circuit theory, node voltage and the branch current at the branch road two ends of each in system strictly meet topological constraints and electric constraint.Fig. 5 is a certain normal branch road, meets following constraint condition,
Wherein,
.
For whole electrical network, supposing has
the bar branch road, so can build system of equations:
And when fault occurs, if trouble spot is apart from node
the number percent of length total track length
, as shown in Figure 6.Have
So according to
(wherein
for leveling off to 0 arithmetic number) judge whether current electrical network branch trouble, then basis have occurred
concrete element corresponding branch road number while forming to come failure judgement to occur in branch road, wherein
form can be expressed as:
The above; be only preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is familiar with those skilled in the art in the technical scope of the present invention's exposure; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.
Claims (5)
1. the quick trace analysis method in electric island of serving new type of wide-area backup protection; it is characterized in that; in the synchronous phasor measurement unit Real-time Collection electric power networks of described method in utilizing WAMS on the basis of the displacement information of each switch; at first adopt the bus analysis walked abreast in each plant stand based on the tree-quick trace analysis method in electric island of bus incidence matrix; then adopt the quick trace analysis method in electric island of rule match accelerating algorithm to complete Network Topology Analysis between plant stand, thereby realize the express-analysis to whole topological structure of electric.
2. a kind of quick trace analysis method in electric island of serving new type of wide-area backup protection according to claim 1, is characterized in that, the concrete grammar that carries out bus analysis in plant stand is as follows:
A. by " opening ", to " closing ", while making in plant stand to increase a branch road, if under "On" state, newly-increased branch road two ends bus belongs to same electric island to certain switch in plant stand, and newly-increased branch road is chord; Otherwise newly-increased branch road, for tree, goes to step d;
B. when the interior connection bus of plant stand
and bus
branch road
on switch by " closing " to " opening ", make branch road
during disconnection, if branch road
be chord, do not affect the division on electric island, this branch road in the chord set is deleted and gets final product, go to step d;
C. when the interior connection bus of plant stand
and bus
branch road
on switch by " closing " to " opening ", make branch road
during disconnection, if branch road
be tree, electric island separation case is not clear, deletes element in tree Zhi Jihe
after, need to further do following processing:
1. investigate the corresponding tree graph of electrical network, find branch road
two groups of set that after disconnecting, bus is divided into, obtain and bus
bus set by tree Zhi Xianglian
and and bus
bus set by tree Zhi Xianglian
;
If 2. can be in the chord set
in find such chord, the one side bus the set
in, the opposite side bus is in set
in, bus so
with bus
still belong to same electric island, redefine this chord for tree, go to step d;
If 3. in the chord set
in do not have above-mentioned chord, electric island will be separated into two electric islands of son, forward steps d to;
D. according to the increase and decrease of branch road and deciliter situation on electric island, revise electric island, bus numbering and tree Zhi Lianzhi set, complete the quick trace analysis in electric island.
3. a kind of quick trace analysis method in electric island of serving new type of wide-area backup protection according to claim 1 and 2, is characterized in that, the concrete grammar that carries out Network Topology Analysis between plant stand is as follows:
A. work as branch road
by " opening ", to " closing ", while making between plant stand to increase a branch road, if under "On" state, newly-increased branch road two ends bus belongs to same electric island, and so electric island number is constant, and new branch road is defined as to chord; If under "On" state, newly-increased branch road two ends bus belongs to two electric islands, and two different electric islands are merged into an electric island;
B. work as connection bus
and bus
branch road
on switch by " closing " to " opening ", make branch road between plant stand
during disconnection, if branch road
be chord, electric island is constant; If
for tree, investigate its respective path set
whether be empty set, if
for empty set, separate on electric island; If
not empty set, will
in corresponding bang path, a contained chord is decided to be new tree and props up;
C. according to the increase and decrease of branch road and deciliter situation on electric island, revise electric island, bus numbering and tree Zhi Lianzhi set:
If 1. a newly-increased branch road, be that empty tree Zhi Jinhang searches for again to all set of paths, give the corresponding set of paths that makes new advances; If newly-increased branch road
tree, except being, empty tree Zhi Jinhang searches for again, also will increase its corresponding set of paths to set of paths
, and revise corresponding tree Zhi Lianzhi set;
If 2. reduce by a branch road:
1), if this branch road is chord, revise the chord set;
2) if this branch road is tree, and cause electric island to separate, respectively the bus in the two ends bus set of this tree is numbered, and again form on this basis tree and chord set;
3) if this branch road is tree, but electric island does not have separation, a chord in the respective path set of this tree is updated to new tree and props up, and the upper corresponding set of paths of coupling.
4. a kind of quick trace analysis method in electric island of serving new type of wide-area backup protection according to claim 3; it is characterized in that; determine when tree props up corresponding set of paths; if certain tree corresponding set of paths has many bang paths that this branch road two ends bus is connected; in search procedure; stop subsequent searches after finding article one, make in each set of paths to only have at most a satisfactory bang path.
5. a kind of quick trace analysis method in electric island of serving new type of wide-area backup protection according to claim 4; it is characterized in that; while carrying out between plant stand Network Topology Analysis; electric island, bus numbering and the off-line process that is revised as of setting the Zhi Lianzhi set, all the other are the on-line analysis process.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107302208A (en) * | 2017-05-16 | 2017-10-27 | 河南理工大学 | A kind of coalmine high-voltage power network quick-break sets verified in parallel method |
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| CN102820707A (en) * | 2012-08-24 | 2012-12-12 | 珠海许继电气有限公司 | Topological automatic identification system for distribution network |
| CN103020726A (en) * | 2012-10-29 | 2013-04-03 | 南方电网科学研究院有限责任公司 | Robust state estimation method for full PMU measurement |
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Cited By (2)
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| CN107302208A (en) * | 2017-05-16 | 2017-10-27 | 河南理工大学 | A kind of coalmine high-voltage power network quick-break sets verified in parallel method |
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