CN102280875A - Island division of power network - Google Patents
Island division of power network Download PDFInfo
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- CN102280875A CN102280875A CN2010102179840A CN201010217984A CN102280875A CN 102280875 A CN102280875 A CN 102280875A CN 2010102179840 A CN2010102179840 A CN 2010102179840A CN 201010217984 A CN201010217984 A CN 201010217984A CN 102280875 A CN102280875 A CN 102280875A
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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
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/20—Information technology specific aspects, e.g. CAD, simulation, modelling, system security
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Abstract
The invention relates to a system of controlling real time island division of power network. The power network comprises: generator buses, load buses and transmission lines. The system comprise: a control unit, which can identify different kinds of coherent generator buses; a control unit, which is used to subdivide the power network into nonintersecting domains; the control unit, which can divide the nonintersecting domains into a first group and a second group; the control unit, which is used to determine that an initial segmented boundary is formed by a group of split lines; the control unit, which is used to transfer the load buses connected by the split lines successively from one group of the first group and the second group to another group and simultaneously update elements in the two groups and one group of the corresponding split lines till the minimal load in the two updated groups reaches imbalanced power generation; the control unit, which is used to determine that a final segmented boundary is formed by one group of the updated split lines; a segmentation unit, which is used to divide the power network into two islands according to the final segmented boundary.
Description
Technical field
Generally speaking, the present invention relates to the power network field, particularly, the present invention relates to be used to control the method that the isolated island of power network is divided.
Background technology
Generally speaking, planning and running power network make it can bear burst accident, especially when they turn round under the unusual situation near stability limit.Yet the incident that can not expect, weak connection or other fault may cause serious disturbance, and this will cause in the power network loss of same tone between the zones of different or synchronism.If the loss of such synchronism takes place, must may cause the power network loses stability and before causing the interference diffusion of major power outage or catastrophic failure, separate the not zone of the people having the same aspiration and interest any so.
A kind of method of tackling large disturbance is to determine that in the very short time which generator is the people having the same aspiration and interest or synchronous, then, power network is separated into the isolated island controlled, that keep certainly of people having the same aspiration and interest generator.Yet, because the composite type of its sample space expands, for the suitable isolated island of extensive power network search is divided very complicated problems of calculating that the border is.For example, for IEEE 118-bus electric power system, have 2 with 186 branch roads
186≈ 9.8 * 10
55Plant possible isolated island and divide the border result.
The protective device of having developed such as step-out (out-of-step) relay detects the synchronism loss, and power network is divided into controlled different isolated islands protects power network.
The schematically illustrated a kind of example of representing IEEE 118-bus power network 203a of Fig. 1.This power network comprises generator bus, load bus and the transmission line that connects described bus.Each stain is represented a generator bus, and each white point is represented a load bus.Every transmission lines represents that by a directed line segment the effective electrical power of this direction indication of oriented section on transmission line flows.
If for example (promptly at line segment 23-25, tie point 23 and 25 line segment) on break down, the stepout-relay (not shown) of then installing on the transmission line will detect instability, and will make some transmission lines (with dashed lines L10-L100 represents) tripping operation usually, so that this system partitioning is become two isolated islands.Yet, may make transmission line (ten the dotted line L10-L100) tripping operation of excessive number, cause the more important thing is, finally can in each isolated island, produce load-generation imbalance such as the power loss on some load bus of the load bus of representing with white point 33.
Propose several other methods in this area and determined just to suffer the unstable mode of the power network of power disturbance.Prior art document WO 03090328 has provided a kind of example, has wherein described a kind of method that is used for the on-line transient stability analysis, specifically, and a kind of method that is used to distinguish stable and unsettled burst accident.
Some other document has proposed different strategies and has determined the unstable mode of power network and this network is carried out the isolated island division.These known strategies comprise slow people having the same aspiration and interest method, mate in real time based on the real-time monitoring of WAMS (WAMS) and in line computation.
At document Bo Yang, Vijay Vittal, and Gerald T.Heydt, " Slow-coherency-based controlled islanding-A demonstration of the approach on the August 14,2003 blackout Scenario ", IEEE Trans on Power System, vol.21, pp.1840-1846, among the Nov.2006, illustration a kind of example of slow people having the same aspiration and interest method.In the document, the author has proposed a kind of by utilizing the little sub-network of maincenter bus structure to carry out the method that isolated island is divided, and wherein, described maincenter bus is one of bus in the group border.This sub-network is called as interface network.Then, this interface network is carried out the cut set that exhaustive-search determines to form isolated island.For each candidate's isolated island, calculate total load and generating, choose and have the unbalance isolated island of minimum load-generating as optimum cut set.
At document Xiaoming Wang, Vijay Vittal, " System Islanding Using Minimal Cutsets with Minimum Net flow ", Proceedings of the 2004 IEEE PES Power System Conference and Exposition, New York, among the October 2004, illustration another kind of example.In the document, also used the slow people having the same aspiration and interest generator of transferring together to determine, and the minimal cut set technology in the use graph theory is handled the isolated island division of power network.Specifically, problem is converted into the search minimal cut set, so that the isolated island that structure has minimum net flow.
Other strategy uses orderly y-bend decision diagram technology that power network is simplified to a small amount of bus (being less than 30 buses), then, constructs total space search at short notice and seeks suitable partitioning boundary.
Yet said method is very complicated, is difficult in the very short time extensive power network to be carried out isolated island and divides, and usually need carry out system simplification before finding partitioning boundary.
At document Bo Yang, et al, " A novel slow coherency based graph theoretic islanding strategy ", Proceedings of the 2004 IEEE PES General Meeting, Florida, among the June 2007, another kind of isolated island partition strategy has been described.In the document, use slow people having the same aspiration and interest analysis to come effectively to determine slow people having the same aspiration and interest generator group between weak connection in the power network.Use a kind of Graph-theoretical Approach that extensive power network is reduced to littler network, but can not miss optimal solution.Adopting a kind of multilayer recurrence bipartite graph dividing method is the desired sub-network with minimum generating-load imbalance with the network division that reduces.
Yet, divide for the concrete property of considering power network rightly and for the suitable isolated island of power network, as if this multilayer figure dividing method also unsatisfactory.
Summary of the invention
Therefore, the problem that the present invention need solve is to propose a kind of simple, effective and reliable system, is used in real time extensive power network being carried out suitable isolated island and divides.
The system that the real-time isolated island of power network is divided to alleviate the interference effect that described power network may stand by a kind of control limits the present invention, described power network comprises the transmission line of generator bus, load bus and the described bus that interconnects, and described system comprises:
Be used to discern the control unit of different classes of people having the same aspiration and interest generator bus,
Be used for described power network is subdivided into the control unit of disjoint domain, wherein, each territory is made up of a generator bus and one group of corresponding load bus,
Be used for described disjoint domain is divided into the control unit of two different groups, in these two different groups, first group is made up of the territory with people having the same aspiration and interest generator bus, and second group is made up of the territory with all other generator bus,
Be used for determining the control unit of the initial partitioning boundary be made up of a component secant, wherein, a described component secant is corresponding to the transmission line that first group of bus is connected to second group of adjacent bus,
Be used for the load bus that will connect by described cut-off rule and transfer to another group described two groups from a group of described first group and described second group one by one, the each simultaneously element of two groups and component secant of described correspondence of upgrading, upgrade minimum load-generatings in group control unit till unbalance up to reaching two
Be used for determining the control unit of the final partitioning boundary formed by the described component secant after upgrading, and
Be used for described power network being divided into the cutting unit of two isolated islands according to described final partitioning boundary.
This controlled isolated island division system allows to cut apart extensive power network at short notice, and need not to provide any central line intermediate reduction model based on the actual identification to people having the same aspiration and interest generator.Described system makes it possible to carry out automatic isolated island with very high overall calculation speed and divides, thereby the influence that prevents any interference expands in the power network.
Described system comprises the measuring unit of the electrical information of the transmission line carrying that is used to measure described power network, and described control unit uses the described electrical information of measuring to discern different classes of people having the same aspiration and interest generator bus.Can be easily and measure electrical information in the described transmission line (for example, voltage or electric current flow) apace so as to provide to the people having the same aspiration and interest behavior of generator bus directly, indication reliably.
According to an aspect of the present invention, described control unit is configured to, by the distribute power of contributing for the electrical power of each load bus based on each generator bus of representing in the power network described one group of load bus generating bus corresponding with it is associated, forms each territory.Distribute power can easily be set up according to the electrical information in the transmission line, thereby, can be with distribute power with acting on a kind of standard very reliably that power network is modeled as the disjoint domain associating, wherein, the quantity of described disjoint domain equals the quantity of generator bus simply.
Described control unit is configured to, and by the electrical information that measures on described transmission line is used the track algorithm that flows, determines described distribute power.
Advantageously, described control unit is configured to, and each load bus is associated with the generator bus that this load bus therefrom receives most of electrical power of this load bus.This is a kind of simple, quick and reliable standard that load bus is associated with the generator bus in each territory of being used for.
Advantageously, if load bus receives identical electrical power from one group of generator bus that two or more generator bus constitute, then described control unit is configured to, based on another standard that comprises following arbitrary condition described load bus is associated with a generator bus in described one group of generator bus: the generator bus of lowest number, nearest generator bus, prominent generator bus, the generator bus that belongs to the territory that presents maximum generation-load imbalance value, the perhaps generator bus of from described one group of generator bus, selecting at random.These also are the standards very simply and fast that certain loads bus and corresponding generator bus are associated.
Advantageously, described control unit is configured to, and realizes transfer sequence one by one by at first moving the load bus that can full out alleviate described load-generation imbalance.This makes and can determine final partitioning boundary fast with the calculation procedure of minimum number.
Advantageously, before each transferring load bus, described control unit is configured to, and determines described load-generation imbalance by total generated output and the difference between the total load power calculated in each group in described first group and described second group.
According to another aspect of the present invention, described control unit is configured to, comprise the not generator bus of the people having the same aspiration and interest if find described second group, then by be used for that initial power network is carried out isolated island and divide identical step described second group is divided into two further isolated islands.This makes it possible to one by one the power network isolated island is divided into three or more isolated island in simple mode.
The present invention also provide a kind of be used to control the real-time isolated island of power network is divided to alleviate the method for the interference effect that described power network may stand, described power network comprises the transmission line of generator bus, load bus and the described bus that interconnects, and said method comprising the steps of:
Discern different classes of people having the same aspiration and interest generator bus,
Described power network is subdivided into disjoint domain, and wherein, each territory is made up of a generator bus and one group of corresponding load bus,
Described disjoint domain is divided into two different groups, and in these two different groups, first group is made up of the territory with people having the same aspiration and interest generator bus, and second group is made up of the territory with all other generator bus,
Determine the initial partitioning boundary be made up of a component secant, wherein, a described component secant is corresponding to the transmission line that first group of bus is connected to second group of adjacent bus,
The load bus that will be connected by a described cut-off rule group from described first group and described second group is one by one transferred to another group in described two groups, simultaneously, the each element of two groups and component secant of described correspondence of all upgrading, up to reach two upgrade minimum load-generatings in the group unbalance till
Definite final partitioning boundary of forming by the described component secant after upgrading, and
According to described final partitioning boundary described power network is divided into two isolated islands.
The invention still further relates to a kind of computer-aid method that is used for according to the real-time isolated island division of said method control power network, wherein, with the described power network of directed graph model representation according to the mobile of described power network and topological data foundation, in this directed graph model, the summit is corresponding to bus, and camber line is corresponding to transmission line, and each summit all is associated with the weight of the power of the corresponding generator/load bus of a representative.
Description of drawings
Read after the preferred implementation of the present invention that provides with reference to the accompanying drawings, will know other features and advantages of the present invention, in the accompanying drawings:
The schematically illustrated isolated island well known in the prior art of Fig. 1 is divided example;
Fig. 2 is schematically illustrated according to the system that can be used to control the real-time isolated island division of power network of the present invention;
An example of the unstable mode in the schematically illustrated IEEE 118-bus of Fig. 3 power network;
An example of the schematically illustrated 16-bus power network of Fig. 4 A-4E, it is used for example the search plan that optimum isolated island according to the present invention is divided the border is shown; And
The schematically illustrated isolated island according to the 118-bus power network among Fig. 3 of the present invention of Fig. 5 A and 5B is divided.
Embodiment
The present invention shows a kind of real-time isolated island splitting scheme, and this scheme is suitable for controlling the isolated island division of extensive power network.This scheme is based on following three Main Stage: the on-line measurement electrical information; If detect the synchronism loss, then the only isolated island of search is divided the border fast; And divide the border according to the isolated island that searches and cut apart described power network fast.
The schematically illustrated system 201 according to an embodiment of the present invention of Fig. 2, this system 201 can be used to control the real-time isolated island division of power network 203.System 201 comprises isolated island division (ICC) 205 of control centre and stepout-relay 207.
Stepout-relay 207 is protected location (comprise and measuring and cutting unit), and this protected location is configured to measure electrical information (voltage, electric current, impedance etc.) so that detect any synchronism loss, finally carries out out-of-step tripping with protection power network 203.
In case detect the synchronism loss, just the electrical information 218 that stepout-relay 207 is measured sends to ICC (control unit) 205, and ICC 205 is configured to determine the unstable mode of power network 203.Specifically, ICC 205 comprises control and processing unit, and this control and processing unit are used to analyze received electrical information, so that the zones of different of identification synchronous generator bus 209.
And ICC 205 is configured to search for only isolated island based on the unstable mode of determined power network 203 and divides border (with dashed lines 217 expressions).
At last, ICC 205 sends order to the stepout-relay 207 of correspondence, makes to cross over the line tripping operation that determined isolated island is divided border 217, so that power network 203 is separated into the different isolated islands of keeping certainly.
The schematically illustrated power network identical to those shown in Fig. 1 of Fig. 3 illustrates an example of the unstable mode in the IEEE118-bus net with example.
Utilize directed graph model 203a to represent power network, wherein, the sequence number on summit is 1-118, and corresponding to bus, and camber line is corresponding to transmission line.Each summit can also be associated with a weight (not shown), and this weight is represented the electrical power of generator bus or the load bus corresponding with this summit.
Each stain (or black summit) expression one generator bus, and each white point (or white summit) expression load bus.Each transmission lines is by directed line segment (or camber line) expression, and the effective electrical power of the direction indication of this directed line segment on transmission line flows.
If (promptly at line segment 23-25, the camber line that connects summit 23 and 25) breaks down on, the stepout-relay of then installing on the transmission line 207 (referring to Fig. 2) will detect unsteadiness, and ten transmission lines of normally with dashed lines camber line L10-L100 being represented tripping operation, this is with described the same with reference to figure 1.Yet according to the present invention, ICC 205 will prevent the isolated island division that stepout-relay 207 execution are hasty like this, divide but will search for suitable isolated island, to satisfy optimal load-generating balance.
More particularly, electrical information 218 that 205 couples of ICC are measured and sent by stepout-relay 207 with utilizing, that transmitted by transmission line is analyzed, so that identification people having the same aspiration and interest generator bus is different classes of.In fact, in whole power network, the loss of any synchronism all will produce big voltage, electric current or impedance and change, and therefore, what ICC 205 can be according to electrical information 218 quick identification people having the same aspiration and interest generators is different classes of.
According to the example of Fig. 3, ICC 205 is divided into two people having the same aspiration and interest classifications with generator bus.The first kind comprises the generator bus that identifies with the black summit that is numbered 10,12,25,26 and 31, and second class comprises the generator bus that identifies with the black summit that is numbered 46,49,54,59,61,65,66,69,80,87,89,100,103 and 111.Generator in all kinds of is synchronous, is that the generator of the generator of the first kind and second class is asynchronous and cause the reason of unstable mode.
After the unstable mode of having determined power network, ICC works on, and searches for only isolated island and divides the border.
In fact, Fig. 4 A-4E schematically shows the example of 16-bus power network 203b, is used for example the search plan that optimum isolated island is divided the border is shown.Power network 203b comprises that sequence number is four generator bus of 1,8,12 and 16, and sequence number is 12 load bus of 2-7,9-11 and 13-15.In addition, given weight to each the bar bus in these buses.
Use P
iThe weight of representing given bus i, and tabulation demonstrates the weight of all buses in table 1.For example the weight of bus 2 is P
2=-2.0, the negative sign of weight represents that bus 2 is load bus, and it consumes 2.0 active power units of automatic network; The weight of bus 1 is P
1=10.0, expression bus 1 is a generator bus, and it injects 10.0 active power units to network.
The bus weight of table 116-bus power network
Search plan mainly comprises three key steps: the territory of determining generator bus; The search initial partitioning boundary; And construct final partitioning boundary.
At first, utilize WAMS (WAMS) to come flow of power data and the topological data of online collection power network 203b at interval by different time.Then, based on these data, set up the graph model of power network with the same way as shown in the example of Fig. 3.
Then, based on graph model and mobile track algorithm, ICC 205 is subdivided into disjoint domain 231a-231d (referring to the closed outline among Fig. 4 B) with power network 203b, and wherein, each territory is made up of a generator bus and one group of corresponding load bus.
Thereby the quantity of the disjoint domain of power network 203b (or its graph model) equals the quantity of generator bus, and every bus must only belong to a corresponding domain.
More particularly, ICC 205 is configured to, by for the distribute power of the electrical power contribution of each load bus described one group of load bus generating bus corresponding with it being associated, form each territory thus based on representative each generator bus in power network 203b.By being used the track algorithm that flows, the electrical information of measuring 218 (referring to Fig. 2) determines distribute power on transmission line 213.Mobile track algorithm is known technology, it utilizes distribute power that flow of power in the transmission line analyzes generator bus in the whole power network and load bus (for example, referring to document Bialek, " Tracing the flow of electricity ", IEEE Proceedings Generation Transmission Distribution, vol.143, pp.313-320, July 1996).
According to first kind of simple and reliable standard, each bar load bus is associated with the generator bus that this load bus therefrom receives most of power of this load bus.
Yet if given load bus receives identical power from the given one group of generator bus that comprises two or more generator bus, ICC 205 is associated one in this load bus and these generator bus based on other standard.For example, the generator bus that presents maximum generation-load imbalance value in given load bus and the generator bus of lowest number, nearest generator bus, prominent generator bus or the territory can be associated, perhaps final with from this given one group of generator bus at random the generator bus of selection be associated.Advantageously, can be according to being used for realizing that the computer program of method of the present invention determines this selection.
Based on mobile track algorithm in the online application of 16-bus, at each generator bus shown in the table 2 to the contribution of each load bus.
Table 2: distribute power is determined in contribution based on flow of power
For example, load bus 6 is shown is respectively 1,3.67,0.02 and 0.31 from the active power that generator bus 1,8,12 and 16 receives to table 2.Load bus 6 receives its very much not part power (3.67 power unit) from generator bus 8, thereby, settling the standard according to the generator bus territory, bus 6 will be in the 231b of the territory of generator bus 8.The territory 231a-231d of all generator bus shown in the table 3, wherein, with the territory of the given generator bus i of (i) expression.For example, the territory 231b that represents generator bus 8 with (8).
The territory of each generator bus of table 3
In the practice, marked change can not take place in the flow of power data and the topological data of known power network at short notice, then can be by the flow of power data and the topological data of the online collection power network in different time interval.Yet, on each time interval, after collecting new data, upgrade the territory 231a-231d of each generator bus.
In case showing, Fig. 4 C determined different territory 231a-231d, then ICC 205 is separated into two different groups with these disjoint domains, i.e. first group and second group, this first group comprises the territory 231a and the 231b of (synchronously) generator bus (sequence number is 8 and 10) that has the people having the same aspiration and interest, and this second group comprises have all other generator bus territory 231c and the 231d of (sequence number is 12 and 16).
Can notice, when breaking down, only roughly the same readjust the distribution the synchronism loss takes place between the motor bus usually two.In this case, the generator of two different groups is simply corresponding to two kinds of other people having the same aspiration and interest generator bus of recognition category.
Yet if identify two or more people having the same aspiration and interest classifications, first group can be selected as corresponding to the kind in these classifications (for example, other synchronous generator classification of maximum kind), and all other classifications are grouped into second group.Then,, second group further is divided into other group according to identical process, two groups once, in any group, all do not have asynchronous generator till.
Will be not same area 231a-231d grouping be two different groups (231a, 231b) and (231c, 231d) afterwards, ICC 205 determines rough or initial partitioning boundaries (with dashed lines 217a represents in Fig. 4 C), so that the isolation asynchronous generator.
Can notice, after the graph model with power network is subdivided into disjoint domain, can easily carry out the initial partitioning boundary search.Only need to find and inject bus (incident bus) and belong to asynchronous generator two not all transmission lines 213 of same area.
For example, if utilize the generator bus 1 and 8 of the people having the same aspiration and interest on the one hand, utilize the generator bus 12 and 16 of the people having the same aspiration and interest on the other hand, discern unstable mode, then initial partitioning boundary 217a will be selected as, and will comprise that the territory of generator bus 1 and 8 is separated with comprising the territory of generator bus 12 and 16.
According to this initial boundary 217a, power network 203b is divided into two isolated islands: with first isolated island of [1] expression and second isolated island of representing with [2], generator bus 1 and 8 is arranged in first isolated island, and generator bus 12 and 16 is arranged in second isolated island.Thereby the bus in territory (1) and (8) belongs to isolated island [1], and the bus in territory (12) and (16) belongs to isolated island [2].This can represent with split vector U, wherein, and the isolated island under each coordinate representation corresponding bus lines:
U＝[[1][1][1][1][1][1][1][1][1][2][2][2][2][2][2][2]]
The dimension of split vector U is corresponding to the sum of the bus among the power network 203b, and for the given bus of representing with digital i, coordinate U
[i]Represent the isolated island that this bus is affiliated.For example, U
[10]Expressions sequence number in=[2] is that 10 bus belongs to isolated island [2].
When having determined split vector U, consider all camber lines (expression transmission line) of graph model.Thereby if the injection bus of camber line belongs to different isolated islands, then this camber line will be stored among the cut-off rule set Ec.
According to above-mentioned example, utilize following cut-off rule to gather to limit the initial partitioning boundary 217a:E of the asynchronous generator of isolating power network 203b
c={ l
12-7, l
10-9, wherein, l
I-jExpression connects the camber line of summit i and j, perhaps, in other words, represents that it injects the transmission line that bus has sequence number i and j.
Although initial partitioning boundary 217a can isolate asynchronous generator,, each generating-load imbalance of isolating in the group still may make us dissatisfied.
Therefore, ICC 205 is configured to, near the only partitioning boundary of the search initial partitioning boundary 217a that separates asynchronous generator, and this initial partitioning boundary 217a is a reasonable starting point can greatly simplifying calculation procedure.
In fact, ICC 205 is configured to, will be by belonging to cut-off rule set E
cThe load bus that connects of line individually (promptly, one by one) group from first group (231a, 231b) and second group (231c, 231d) transfers to another group in these two groups, simultaneously, upgrade the element of two groups and corresponding cut-off rule set E at every turn
c, up to reach in the group after two renewals (231a, 231b) and (231c, the 231d) minimum load-generating unbalance till.Determine described load-generation imbalance by total generated output and the difference between the total load electrical power calculated in each group in first group and second group.
In order to simplify calculation procedure, the neighborhood N (i) of the given load bus i that introduces the following definitions:
N(i)＝{U
[j]|l
j-i∈E
c，U
[j]≠U
[i]}
The neighborhood N (i) that this means given load bus i is corresponding to one group of isolated island, and in this group of isolated island, at least one other load bus j is adjacent with given load bus i.Tabulation has shown the neighborhood according to each load bus among Fig. 4 C of initial partitioning boundary 217a in table 4.
Table 4: according to the neighborhood N (i) of the i of initial partitioning boundary
The neighborhood that table 4 illustrates load bus 7,9 only and 10 is a nonvoid set.Therefore, can directly these load bus be moved on to the either side of initial partitioning boundary 217a, and can not influence the structure of the graph model of expression power network 203b.For example, can directly load bus 7 be moved on in the isolated island [2].
Therefore, transfer in the isolated island [j] according to the load bus of handling one by one in the isolated island [i] of its neighborhood non-NULL.Realize this transfer sequence one by one by at first moving the load bus that can full out reduce the load-generation imbalance in the isolated island [i].
After having shifted out a load bus, upgrade split vector U, partitioning boundary E
c, and the neighborhood of each load bus.The unbalance degree of isolated island [i] repeats this transfer step, till can not reduce again.
For example, in isolated island [1], equal-4 according to the load of electrical generation of initial partitioning boundary 217a is unbalance, and in isolated island [2], equal 4.Generated output deficiency in the isolated island [1] therefore advantageously shifts out in load bus 7 and 9 from [1].If load bus 7 is moved in the isolated island [2], then generating-the load imbalance in [1] and [2] will be respectively-1 and 1.Yet if load bus 9 is moved in [2], unbalance in [1] and [2] will be respectively 4 and-4.Therefore, at first, load bus 7 should be transferred in the isolated island [2], because, guaranteed better generating-load balance like this than load bus 9 is transferred in the isolated island [2].After moving into load bus 7 in the isolated island [2], following renewal split vector
UPartitioning boundary E with correspondence
c:
U=[[1] [1] [1] [1] [1] [1] [2] [1] [1] [2] [2] [2] [2] [2] [2] [2]], and E
c={ l
3-7, l
10-9.
Therefore, also upgraded the neighborhood of each load bus.Now,, reduced the generating-load imbalance in isolated island [1] (and isolated island [2]), still, still had generation deficiency in [1] by load bus 7 is moved in the isolated island [2], and still superfluous in [2].Therefore, can select the load bus 3 in the isolated island [1] and 9 is moved in the isolated island [2].Yet, will all can not reduce any one unbalance in isolated island [1] and [2] in any one immigration [2] in them, therefore, finish the partitioning boundary search and handle.
Fig. 4 D shows final partitioning boundary (representing with polyline 217), and this final partitioning boundary is corresponding to the cut-off rule set E that upgrades
c={ l
3-7, l
10-9.
In case determined final partitioning boundary 217, then ICC 205 sends order to the relay (cutting unit) 207 of correspondence, according to this final partitioning boundary 217 power network 203b is divided into two isolated island 303a and 303b, shown in Fig. 4 E.
Determining of final partitioning boundary 217 described based on power network 203b isolated island being divided into two isolated islands.In fact, a power network isolated island can be divided into three or more isolated islands.Yet when breaking down, the synchronism loss between the people having the same aspiration and interest generator group usually takes place one by one.Unlikely occur two and become asynchronous situation simultaneously with the cohomology group group.Yet, comprise the not generator bus of the people having the same aspiration and interest if find second group, can one by one determine the partitioning boundary in second group once more.Thereby, can second group be divided into two further isolated islands according to initial power network being carried out the used same steps as of isolated island division.Can repeat this process, in any isolated island, do not have asynchronous generator till.
Should be appreciated that isolated island division control centre (ICC) 205 comprises processing unit (for example, work station or computer), this processing unit can be used to be implemented as the computer program of realizing method of the present invention and designing.Can be according to this computer program of directed graph modelling of expression power network.
On the IEEE 118-bus power network of the unstable mode that stands to describe, tested computer program according to isolated island division methods of the present invention with reference to Fig. 3.
With dashed lines L1-L7 shows the isolated island that obtains according to this program and divides the border in Fig. 5 A, and resulting isolated island has been shown in Fig. 5 B.Utilize this isolated island of minimum generating-load imbalance real-time implementation in each isolated island to divide.In addition, different with isolated island division shown in Figure 1, the quantity minimum of the transmission line L1-L7 of tripping operation (being seven lines rather than ten lines), and, there is not load bus to bear any power loss.
As example, write the computer program that is suitable for IEEE 118-bus power network with C Plus Plus, and on common computer, realized this computer program.Be no more than 0.012 second the final running time of this program, and this clearly illustrates that this isolated island divides control method and can suitably cut apart extensive power network in the very short time.
Claims (13)
1. one kind is used for control the real-time isolated island of power network (203) is divided to alleviate the system of the interference effect that described power network may stand, described power network comprises the transmission line (213) of generator bus (209), load bus (211) and the described bus that interconnects, it is characterized in that described system comprises:
Be used to discern the control unit (205) of different classes of people having the same aspiration and interest generator bus,
Be used for described power network is subdivided into the control unit (205) of disjoint domain (231a-231d), wherein, each territory is made up of a generator bus and one group of corresponding load bus,
Be used for described disjoint domain (231a-231d) is divided into the control unit (205) of two different groups, in these two different groups, first group is made up of the territory with people having the same aspiration and interest generator bus (231a, 231b), and second group (231c, 231d) is made up of the territory with all other generator bus
Be used for determining the control unit (205) of the initial partitioning boundary (217a) be made up of a component secant, wherein, a described component secant is corresponding to the transmission line that first group of bus is connected to second group of adjacent bus,
Be used for the load bus that will connect by described cut-off rule and transfer to another group described two groups from a group of described first group and described second group one by one, the each simultaneously element of two groups and component secant of described correspondence of upgrading, upgrade minimum load-generatings in group control unit (205) till unbalance up to reaching two
Be used for determining the control unit (205) of the final partitioning boundary (217) formed by the described component secant after upgrading, and
Be used for described power network being divided into the cutting unit (207) of two isolated islands (303a, 303b) according to described final partitioning boundary.
2. system according to claim 1, it is characterized in that, this system comprises the measuring unit (207) that is used to measure by the electrical information of the described transmission line carrying of described power network, and described control unit (205) uses the described electrical information of measuring to discern different classes of people having the same aspiration and interest generator bus.
3. method according to claim 1 and 2, it is characterized in that, described control unit (207) is configured to, by the distribute power of contributing for the electrical power of each load bus based on each generator bus of representing in the power network described one group of load bus generating bus corresponding with it is associated, forms each territory.
4. system according to claim 3 is characterized in that, described control unit (205) is configured to, and by the electrical information that measures on described transmission line is used the track algorithm that flows, determines described distribute power.
5. according to claim 3 or 4 described systems, it is characterized in that described control unit (205) is configured to, each load bus is associated with the generator bus that this load bus therefrom receives most of electrical power of this load bus.
6. system according to claim 5, it is characterized in that, if load bus receives identical electrical power from one group of generator bus that two or more generator bus constitute, then described control unit (205) is configured to, based on another standard that comprises following arbitrary condition described load bus is associated with a generator bus in described one group of generator bus: the generator bus of lowest number, nearest generator bus, prominent generator bus, the generator bus that belongs to the territory that shows maximum generation-load imbalance value, the perhaps generator bus of from described one group of generator bus, selecting at random.
7. according to the described system of aforementioned arbitrary claim, it is characterized in that described control unit (205) is configured to, realize transfer sequence one by one by at first moving the load bus that can full out alleviate described load-generation imbalance.
8. according to the described system of aforementioned arbitrary claim, it is characterized in that, before each transferring load bus, described control unit (205) is configured to, and determines described load-generation imbalance by total generated output and the difference between the total load power calculated in each group in described first group and described second group.
9. according to the described system of aforementioned arbitrary claim, it is characterized in that, described control unit (205) is configured to, comprise the not generator bus of the people having the same aspiration and interest if find described second group, then by be used for that initial power network is carried out isolated island and divide identical step described second group is divided into two further isolated islands.
10. distribute power network, the described isolated island of the with good grounds aforementioned arbitrary claim of this distribute power network arrangement is divided system.
11. one kind is used for control the real-time isolated island of power network (203) is divided to alleviate the method for the interference effect that described power network may stand, described power network comprises the transmission line (213) of generator bus (209), load bus (211) and the described bus that interconnects, it is characterized in that, said method comprising the steps of:
Discern different classes of people having the same aspiration and interest generator bus,
Described power network is subdivided into disjoint domain (231a-231d), and wherein, each territory is made up of a generator bus and one group of corresponding load bus,
Described disjoint domain is divided into two different groups, and in these two different groups, first group (231a, 231b) is made up of the territory with people having the same aspiration and interest generator bus, and second group (231c, 231d) is made up of the territory with all other generator bus,
Determine the initial partitioning boundary (217a) be made up of a component secant, wherein, a described component secant is corresponding to the transmission line that first group of bus is connected to second group of adjacent bus,
The load bus that will be connected by a described cut-off rule group from described first group and described second group is one by one transferred to another group in described two groups, simultaneously, the each element of two groups and component secant of described correspondence of all upgrading, up to reach two upgrade minimum load-generatings in the group unbalance till
Definite final partitioning boundary of forming by the described component secant after upgrading (217), and
According to described final partitioning boundary described power network is divided into two isolated islands.
12. be used for the computer-aid method that the real-time isolated island of method control power network according to claim 10 is divided, it is characterized in that, with the described power network of directed graph model representation according to the mobile of described power network and topological data foundation, in this directed graph model, the summit is corresponding to bus, and camber line is corresponding to transmission line, and each summit all is associated with the weight of the electrical power of the corresponding generator/load bus of representative.
13. a computer program, it is designed to realize according to claim 11 or 12 described methods when carrying out on computers.
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