CN109061382A - A kind of electrical power distribution network fault location method based on the multiterminal traveling wave time difference - Google Patents
A kind of electrical power distribution network fault location method based on the multiterminal traveling wave time difference Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- 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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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Abstract
The invention particularly discloses a kind of electrical power distribution network fault location methods based on the multiterminal traveling wave time difference.This method comprises: record power distribution network main feeder first and end and branch end initial wavefront arrival time, according to both-end positioning principle, judge that failure occurs in main feeder or branch localized network, branch localized network, then judge the branch localized network for unit traveling wave failure domain or network traveling wave fault domain, network traveling wave fault domain, then construct fault branch searching matrix；According to the variation characteristic of element in the fault branch searching matrix, fault branch is determined；The initial wavefront arrival time for merging the main feeder both ends and fault branch end record, the specific location of fault point on the fault branch is calculated, realizes that distribution network failure point is accurately positioned.Quick, accurate distribution network failure positioning may be implemented in this method, has the characteristics that principle is simple, practical, positioning accuracy is high.
Description
Technical field
The present invention relates to Operation of Electric Systems maintenance technology fields, more particularly to a kind of matching based on the multiterminal traveling wave time difference
Electric network fault localization method.
Background technique
With the continuous development of society, requirement of the power consumer to power quality and power supply reliability is higher and higher.Institute
Have in power outage, the power outage as caused by distribution network failure accounts for 90% or more.Quick, the accurate fault location of power distribution network have
Conducive to the small range isolation of failure and Quick overhaul, have great significance for safe and stable, the efficient operation of power distribution network.
Currently, distribution network failure location algorithm is broadly divided into impedance method, injecting signal and traveling wave method.Impedance method is by failure
Point transition resistance, neutral grounding mode, the influence of distribution capacity are very big, and range accuracy is poor, for matching for multiple-branching construction
There is pseudo-fault point in power grid, impedance method；The energy of injecting signal Injection Signal is limited by voltage transformer, Bu Nengying
For intermittent defect, the degree of automation is lower, and needs to increase signal injection device, and investment is big；Traveling wave method is not by failure mistake
The influence of the factors such as resistance, system oscillation and CT saturation is crossed, is applied successfully in power transmission network fault location.
Currently, having proposed a variety of technical sides for carrying out fault location to transmission line of electricity based on traveling wave method in the art
Case, such as application No. is the Chinese invention patent applications of 201710397833.X, disclose a kind of utilization route both ends electric current row
The fault positioning method for transmission line of wave and voltage traveling wave is distinguished when transmission line of electricity breaks down from route both ends measuring point
Obtain the current traveling wave and voltage traveling wave of route；The current traveling wave that route both ends obtain is passed through with voltage traveling wave respectively continuously small
Wave conversion carries out the identification of back wave wave head, and obtains four groups of fault distance numbers according to initial row wavefront and transmitted wave wave head
According to realizing power transmission line by carrying out comprehensive adjusting to four groups of data using global geometric average advantest method and obtaining fault distance
The fault localization on road.This method has certain accuracy for the fault localization of transmission line of electricity.
However, power distribution network topological structure is complicated, there are a large amount of branches on feeder line, overhead lines combined with cable is very common,
Very big difficulty is brought to fault location, and distribution line length is shorter, so comparing transmission line of electricity to fault location required precision
It is higher, the scheme more in the prior art for the positioning of transmission line malfunction traveling wave, for matching with complex topology structure
Power grid cannot achieve accurate fault location, or even positioning failure.
Summary of the invention
It is existing to solve the object of the present invention is to provide a kind of electrical power distribution network fault location method based on the multiterminal traveling wave time difference
The low technical problem of distribution network failure positioning accuracy in technology.
To achieve the above object, the present invention provides following schemes:
A kind of electrical power distribution network fault location method based on the multiterminal traveling wave time difference, comprising steps of
Step A records power distribution network main feeder first and end and branch end initial wavefront arrival time, according to both-end
Fault traveling wave positioning principle judges that failure occurs in main feeder or branch localized network, and branch localized network then enters step
B；
Step B judges branch localized network for unit traveling wave failure domain or network traveling wave fault domain, network traveling wave fault
Domain then constructs fault branch searching matrix；
Step C determines fault branch according to the variation characteristic of element in fault branch searching matrix；
Step D merges the initial wavefront arrival time at main feeder both ends and fault branch end record, calculates failure
The specific location of branch road fault point.
Preferably, step B comprising steps of
Judging branch localized network has and an only branch, is then to be determined as unit traveling wave failure domain, no, then determines
For network traveling wave fault domain；
Unit traveling wave failure domain then arrives main feeder first and end and the initial wavefront of the end record of a branch
It is matched two-by-two up to the time, calculates separately out corresponding Fisrt fault positional distance, seek the average value of Fisrt fault distance
As preliminary fault location result.
Preferably, fault branch searching matrix is constructed in step B, comprising:
The equivalent main feeder in network traveling wave fault domain is set, by the head end of the equivalent main feeder and end and the net
Each branch end in network traveling wave fault domain is as test point, using the head end of equivalent main feeder and end as reference end,
It is successively matched two-by-two with all test points in network traveling wave fault domain, calculates its respective second fault distance, obtain reference
The line length between each test point respective branches node is held, by the ratio of second fault distance and the line length
As the element in the fault branch searching matrix, matrix is constructed.
Preferably, step C judges fault branch according to the variation characteristic of element in fault branch searching matrix, comprising:
When having the value of a column element to be all larger than 1 in fault branch searching matrix, then it is determined as branch's failure, fault point exists
Branch road where the corresponding branch terminal of the column element；
When the value for having an at least column element in fault branch searching matrix is equal to 1, then it is determined as node failure, fault point
On the branch node that the column element corresponds to branch；
When have in fault branch searching matrix one value of an at least column element be equal to 1, another value be greater than 1, while have to
A few column element and the column element value are on the contrary, be then determined as failure between node, fault point two column elements opposite in value
On route between corresponding branch node.
Preferably, before step A, further include the steps that doing normalized to distribution network line structure, specifically include by
It is according to following formula that cables all in power distribution network are all equivalent at overhead transmission line:
v1、v2Respectively velocity of wave of the traveling wave in overhead line and cable, LcableCharacterize cable length in power distribution network, LeqReflection
Length is LcableThe equivalent length at after overhead transmission line of cable.
It preferably, further include being modified to the element value in fault branch searching matrix before step C after step B
The step of, it specifically includes:
If the element value in searching matrix is β, margin for error is set as μ, when reality calculates fault search matrix, in matrix
The value of each element is corrected by following situations:
As 1- μ≤β≤1+ μ, it is modified to β=1；
As β < 1- μ, it is modified to β < 1；
As β > 1+ μ, it is modified to β > 1.
Preferably, step D includes:
The head end M and end N of the main feeder of power distribution network are matched two-by-two with branch end where the f of fault point respectively
It is right, according to both-end fault traveling wave positioning principle, calculate fault distance lMfAnd lNf, using the mean value of fault distance as preliminary failure
Positioning resultThe positioning result is scaled physical fault distance according to the following formula:
In formula:Indicate physical fault positioning result；l*Length for the practical overhead line for including in the M-f of path.
The specific embodiment provided according to the present invention, the invention discloses following technical effects:
Electrical power distribution network fault location method provided by the invention based on the multiterminal traveling wave time difference passes through traveling wave acquisition device, note
Record power distribution network main feeder both ends and every branch end fault initial traveling wave arrival time；According to arrival time, failure is judged
Whether point is on the branch localized network that the either branch node with main feeder is connected, branch more complicated for topological structure
Localized network then constructs fault branch searching matrix, by the variation characteristic of element in fault branch searching matrix, judges failure
Branch merges the initial wavefront arrival time at main feeder both ends and fault branch end record, calculates accurate failure point
It sets.This method can be suitable for the more complicated power distribution network of network topology structure, and positioning accuracy is relatively high, tests through simulation analysis
Card, absolute positioning error is within 50 meters.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the flow diagram of electrical power distribution network fault location method of the embodiment of the present invention one based on the multiterminal traveling wave time difference；
Fig. 2 is typical distribution net topology topology example figure in the embodiment of the present invention two；
Fig. 3 is to simplify the unit traveling wave failure domain exemplary diagram of going out in typical distribution net topology structure shown in this Fig. 2；
Fig. 4 is certain the simple distribution network exemplary diagram of the embodiment of the present invention two；
Fig. 5 is the exemplary diagram in the network traveling wave fault domain for simplifying in typical distribution net topology structure shown in Fig. 2；
Fig. 6 is the distribution system exemplary diagram built in simulation process based on the structure of typical distribution net topology shown in Fig. 2.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
To keep technical solution of the present invention more obvious and easy to understand, the present invention is made With reference to embodiment further
Detailed description.
Embodiment one
The embodiment of the invention discloses a kind of electrical power distribution network fault location methods based on the multiterminal traveling wave time difference, referring to Fig. 1 institute
Show, the method comprising the steps of:
Step S101 records power distribution network main feeder first and end and branch end initial wavefront arrival time.
Step S102, using power distribution network main feeder first and end initial wavefront arrival time, according to both-end fault traveling wave
Positioning principle judges that failure occurs in main feeder or branch localized network, and branch localized network then enters step S103, no,
Then enter step S104.
When failure occurs on the route on main feeder other than non-branch node, then it is assumed that the failure occurs in main feeder
On, when failure occurs on branch node, then it is assumed that failure occurs on branch localized network.
Step S103 judges branch localized network for unit traveling wave failure domain or network traveling wave fault domain, network traveling wave
Failure domain, network traveling wave fault domain, then enter step S105, no, then enters step S107.
Step S104 calculates the fault distance on main feeder.
According to both-end fault traveling wave positioning principle, the specific location of fault point on main feeder can be directly obtained.
Step S105 constructs fault branch searching matrix using the multiterminal traveling wave time difference.
Step S106 determines fault branch according to the variation characteristic of element in fault branch searching matrix；
Step S107 merges main feeder both ends and fault branch end record according to both-end fault traveling wave positioning principle
Initial wavefront arrival time, calculate accurate position of failure point.
Embodiment two
Second embodiment of the present invention provides a kind of preferred implementations of electrical power distribution network fault location method based on the multiterminal traveling wave time difference
Scheme.
Preferably, the electrical power distribution network fault location method comprising steps of
S201: power distribution network main feeder first, last both ends are installed by master positioning device, all branch end installation auxiliary positioning dresses
It sets, records initial wavefront arrival time；
S202: distribution line structure normalized is carried out to overhead lines combined with cable；
S203: according to both-end fault traveling wave positioning principle, when being reached using the initial wavefront of master positioning device record
Between be accurately positioned failure be main feeder fault the failure on branch localized network still occurs；
S204: according to the network topology structure obtained in advance, determine that the branch localized network of guilty culprit is unit traveling wave
Failure domain or network traveling wave fault domain；
S205: in network traveling wave fault domain, according to the network topology structure and initial traveling wave in the network traveling wave fault domain
Wave head arrival time builds fault branch searching matrix, determines fault branch according to matrix element variation characteristic；
S206: the initial traveling wave arrival time recorded according to master positioning device and fault branch end auxiliary locator,
Realize that distribution network failure point is accurately positioned.
Shown in Figure 2, the embodiment of the present invention two is by taking power distribution network topological structure shown in Fig. 2 as an example, to skill of the invention
Art scheme further illustrates.It should be noted that Fault Locating Method of the invention is applicable to the distribution of various topological structures
Net, is not limited in structure shown in Fig. 2, and the present invention different one illustrates.
As an embodiment, traveling wave acquisition device is installed at main feeder both ends, forms master positioning device；Every 1 branch
Road end distribution transformer installs traveling wave acquisition device, as auxiliary locator.By GPS/ big-dipper satellite time dissemination system into
Row sync identification, when failure occurs, each fault traveling wave acquisition device is by the initial traveling wave arrival time of record and distribution transformer
Number and network topology structure are transferred to traveling wave by Fiber Optical Communication System and position cloud computing platform, and cloud platform is to current number
It is integrated according to resource and processor resource, forms fault branch searching matrix, judge fault section, and then failure is accurately positioned
Point position.
Preferably, in the embodiment of the present invention two, power distribution network is mostly one cable hybrid line of overhead line, wherein M-a and
G-h twolink (thick line) is cable, remaining route is overhead line.Traveling wave speed is significantly different in both structure routes,
Failure initial wavefront arrival time is different, can do normalized to distribution line structure.v1、v2Respectively traveling wave is in frame
Velocity of wave in ceases to be busy and cable, Lcab1eCertain section of cable length in power distribution network is characterized, there are following conversion relations:
LeqReflecting length is LcableThe equivalent length at after overhead transmission line of cable.According to formula (1) by institute in power distribution network
There is cable all equivalent at overhead transmission line, the referred to as normalization of distribution line structure.
The embodiment of the present invention will occur in failure in power distribution network and be divided into two classes, and one type is occurred on main feeder
(non-branch node) is based on both-end positioning principle, the initial traveling wave arrival time recorded using master positioning device (M, N), can be quasi-
Determine that the position of failure point on main feeder, such as the fault point f1 in Fig. 6 occur for position.It is another kind of, be failure occur with point
On Zhi Jiedian connected branch localized network (including the branch node).
Branch localized network includes unit traveling wave failure domain and network traveling wave fault domain.
Wherein, if localization of fault certain branch node on main feeder, there are following two situations:
1) branch node a, b, f, g, i, j in branch node, such as Fig. 2 on main feeder just occur for fault point；Or
Branch node calculates in allowable range of error (100m), can directly calculate position of failure point；
2) failure occurs on the branch road being connected directly with branch node, needs further to define failure domain.
If the branch node has and an only branch (such as Fig. 2 interior joint a, f, j), failure belongs to unit traveling wave fault
The initial traveling wave arrival time of master positioning device (M, N) and auxiliary locator (being located at I point) record are matched in domain, such as Fig. 3
tM、tN、tICorresponding Fisrt fault distance is calculated separately out, the average value of Fisrt fault distance is as positioning result.Fig. 3
In, line length of the branch node i apart from the end main feeder M is 30.69km, and the line length apart from main feeder N-terminal is 3.5km,
Branch's i-I length is 10.7km, according to the failure initial traveling wave arrival time that main feeder terminal M, N and branch end I are recorded,
Position of failure point can be acquired on branch i-I at branch node i6.7km.
If there are a plurality of branch or branch road, there is also multiple branch nodes, such as Tu2Zhong branch to save on the branch node
Point b, g, wherein on the branch b-E of branch node b, and there are two branch node d and e, and on the branch d-B of branch node d
There is branch node c；And there are also branch node h and branch h-G on branch g-H.For the complicated local area network with multiple branches
Network needs to further determine that fault branch.Selection is connected directly apart from the closer master positioning device of branch node with branch node
Localized network, network consisting traveling wave fault domain.Such as shown in Fig. 2, when preliminary judgement failure occurs to be connected in b branch node
Branch localized network when, then selection apart from the closer end M branch node b, the localized network being connected directly with branch node b,
Network consisting traveling wave fault domain (as shown in Figure 5).For network traveling wave fault domain, need to construct fault branch searching matrix.
Construction method are as follows: make the head end of the equivalent main feeder in network traveling wave fault domain and end and each branch end
For test point, setting number, according to both-end positioning principle, calculates ginseng respectively using the both ends of equivalent main feeder as reference end
Second fault distance at end with all test points is examined, respectively by the second fault distance calculated and reference end to test point pair
The ratio between the line length between branch node is answered, as element, fault branch searching matrix is built, according to matrix element and numerical value
Variation characteristic between " 1 " determines fault branch.
For example, being illustrated by taking certain simple distribution network shown in Fig. 4 as an example to how constructing matrix, each line length is
Know, set gradually failure: branch failure (d1Point), node failure (d2Point), failure (d between node3Point), according to both-end traveling wave
Positioning principle, with head end test point M1As reference end, head end M can be calculated1Point and test point N1、N2And M2Fault distance；
Similarly, with end point detection point M2As reference end, M can be calculated2Point and test point M1、N1And N2Fault distance, such as 1 institute of table
Show.
Table 1
Then, respectively by the fault distance calculated and reference end to test point corresponding node TiBetween line length it
Than forming matrix as element, fault branch searching matrix being built, such as formula (3) such as formula (2).
TS[i, j]=lMidNj/lMiTj (2)
In conjunction with the data in table 1 and formula (2), (3), it is known that: different faults point position, the member in fault branch searching matrix
Plain TS[i, j] and " 1 " there are certain changing rules, determine using matrix element variation characteristic fault branch.
Further, shown in Fig. 2 for power distribution network topological structure, Fig. 2 Complicated Distribution Network can be simplified to net shown in fig. 5
Network traveling wave fault domain, wherein in Fig. 5, M-E is equivalent main feeder, and M, B, C, D, E are test point, wherein equivalent main feeder
Head end M and end E is reference end, and the corresponding branch node of B includes d and c, and the corresponding branch node of C includes c and d, and E and D are corresponding
Branch node be e.To the network establishment fault branch searching matrix, using the matrix element variation characteristic to fault branch into
Row determines, makes a concrete analysis of as follows:
1. branch's failure.
As shown in fig. 5, it is assumed that the i.e. fault point f on branch e-D occurs for failure2, equivalent main feeder head end M and end E divide
Not Zuo Wei reference end, successively matched two-by-two with all branch ends, calculate fault distance, and it is last to branch to compare itself and reference end
Hold the ratio of the line length of corresponding branch node, it is worth mentioning at this point that: when there are (such as branch d-B when multiple nodes for branch
It is upper there are two node d and c) to need to increase the column vector that branch end corresponds to different branch nodes, build fault branch search
Matrix such as formula (4).
According to fault search matrix element variation characteristic, can obtain: fault branch, with head end substation M and end substation E
It matches two-by-two, the distance between node where the fault distance calculated is centainly greater than reference point and faulty line, so, branch
Road one-end substation D column, element are all larger than 1；And the element of other column, no more than 1.It can similarly obtain, when failure occurs
On branch dM, cB, cC, eE, available identical fault signature rule.
2. node failure.
Failure occurs in node d, fault branch searching matrix, such as formula (5):
The characteristics of according to fault search matrix, can obtain: branch where malfunctioning node, column element are equal to 1.Failure in Fig. 5
Point f3As node failure.
3. failure between node.
Failure f4The corresponding fault branch searching matrix such as formula between node d and node e (i.e. route d-e) occurs
(6):
It according to fault search matrix element Variation Features, can obtain: the corresponding column element (B of fault point left nodedColumn and Cd
Column), element TS[1, j] it is equal to 1, element TS[2, j] are less than 1；And on the right side of fault point the corresponding column element of node value, just with
It is opposite (D column) that fault point left node corresponds to column element value.
Preferably, in the embodiment of the present invention two, before determining fault type according to above-mentioned decision procedure, also reply event
Barrier branch searching matrix is modified.
When using above-mentioned resolution principle, since various influence factors cause the presence of position error, fault branch searches for square
Each element value in battle array, need to retain certain nargin.Therefore, the fault search matrix of generation need to be modified.
It is assumed that certain element value is β in searching matrix, the margin for error set is μ.When practical calculating fault search matrix, square
The value of each element is corrected by following situations in battle array:
As 1- μ≤β≤1+ μ, it is modified to β=1；
As β < 1- μ, it is modified to β < 1；
As β > 1+ μ, it is modified to β > 1.
Generally, the value of margin for error μ is 0.005.
Above-mentioned steps realize the Primary Location of fault point, the branch or route being able to confirm where fault point.
After determining fault branch according to principles above, the head end substation of the main feeder of power distribution network and end are become respectively
Power station is matched two-by-two with branch end transformer where the f of fault point, calculates fault distance lMfAnd lNf, by the equal of fault distance
Value is used as final positioning resultThe positioning result is the fault distance after distribution line normalization, needs further to be scaled
Physical fault distance:
In formula,Indicate physical fault distance；l*Length for the practical overhead line for including in the M-f of path.
It should be noted that being used as final result using mean failure rate distance, initial traveling wave can be offset to a certain extent
The positive negative error of arrival time, improves the accuracy of positioning.
By verifying, the present invention is proposed method, based on power distribution network topological structure shown in Fig. 2, using PSCAD/EMTDC
Distribution system shown in Fig. 6 is built.Each branch end is all connected to the distribution transformer of Dyn type connection, no-load voltage ratio 10kV/0.4kV.
Traveling wave acquisition device, collection voltages travelling wave signal, sampling are installed at main feeder first, last both ends and each branch route one-end substation
Set of frequency is 1MHz, carries out 5 layers of wavelet package transforms decomposition to original signal, decompose in the 5th layer of extraction [156.25,
171.875] kHz band signal.The wherein corresponding each section of route of digital representation in Fig. 6 near each branch or main feeder line segment
Or the length of branch, unit km, such as e-d line length are 3.5km, C-c line length is 4.0km, other are no longer one by one
Statement.
4 failures: 1) main feeder are respectively set in simulation model, away from substation M 9.3km (f1)；2) branched line e-
D, away from (f at node e 2.5km2)；3) (f at node d3)；4) between node d and node e, away from (f at node d 3km4), send out
Raw singlephase earth fault, transition resistance are set as 200 Ω.
With f2(branched line e-D, away from node e 2.5km), each test point initial row are described in detail for point failure
Wave arrival time, as shown in table 2.
Table 2
According to both-end positioning principle, the end substation M is beginning, is arrived using the initial traveling wave that main feeder substation M and N is recorded
Up to the time, judge whether failure occurs on main feeder:
V is line mould wave velocity in formula.According to calculated result, can obtain: failure occurs in node b, or with the direct phase of node b
On branched line even, network traveling wave fault domain as shown in figure 5, calculate separately the value of each element in fault branch searching matrix,
According to aforementioned matrix modification rule, can obtain formula (9), D column corresponding element is all larger than " 1 " in matrix, so, determine that fault branch is
e-D。
The initial wavefront arrival time for merging master positioning device M, E and auxiliary locator D record, obtain distribution wire
Position of failure point after the normalization of roadAway from substation M 28.624km；Further it is scaled physical fault distanceAre as follows: away from
Substation M 24.418km, such as formula (10).
Final position of failure point is branch e-D, away from node e 2.518km, position error are as follows: 18m.
Those skilled in the art can refer to the simulated example and know that the fault point specific location of other fault types calculated
Journey repeats no more.
The emulation positioning result of each fault type is as shown in table 3.
Table 3
As it can be seen that can accurately, reliably determine fault section using Fault Locating Method provided by the invention and be accurately positioned
Position of failure point, absolute error 40m, the positioning accuracy is higher, realizes the quick positioning to distribution network failure point, positioning accurate
Degree is higher, easy to implement, has certain application prospect.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (7)
1. a kind of electrical power distribution network fault location method based on the multiterminal traveling wave time difference, which is characterized in that comprising steps of
Step A records power distribution network main feeder first and end and branch end initial wavefront arrival time, according to both-end failure
Traveling wave positioning principle judges that failure occurs in main feeder or branch localized network, and branch localized network then enters step B；
Step B judges the branch localized network for unit traveling wave failure domain or network traveling wave fault domain, network traveling wave fault
Domain then constructs fault branch searching matrix；
Step C determines fault branch according to the variation characteristic of element in the fault branch searching matrix；
Step D merges the initial wavefront arrival time at the main feeder both ends and fault branch end record, calculates
The specific location of fault point on the fault branch.
2. the electrical power distribution network fault location method according to claim 1 based on the multiterminal traveling wave time difference, which is characterized in that described
Step B comprising steps of
Judging the branch localized network has and an only branch, is then to be determined as unit traveling wave failure domain, no, then determines
For network traveling wave fault domain；
Unit traveling wave failure domain then arrives the initial wavefront that the end at the main feeder both ends and a branch records
It is matched two-by-two up to the time, calculates separately out corresponding Fisrt fault distance, seek the average value conduct of Fisrt fault distance
Preliminary fault location result.
3. the electrical power distribution network fault location method according to claim 1 based on the multiterminal traveling wave time difference, which is characterized in that described
Fault branch searching matrix is constructed in step B, comprising:
The equivalent main feeder in network traveling wave fault domain is set, by the head end of the equivalent main feeder and end and the net
Each branch end in network traveling wave fault domain is as test point, using the head end of the equivalent main feeder and end as reference
End, successively matches two-by-two with all test points in network traveling wave fault domain, calculates its respective second fault distance, obtain
Take the reference end to the line length between each test point respective branches node, by second fault distance and the route
The ratio of length constructs matrix as the element in the fault branch searching matrix.
4. the electrical power distribution network fault location method according to claim 3 based on the multiterminal traveling wave time difference, which is characterized in that described
Step determines fault branch according to the value of element in the fault branch searching matrix, comprising:
When having the value of a column element to be all larger than 1 in the fault branch searching matrix, then it is determined as branch's failure, fault point exists
Branch road where the corresponding branch end of the column element；
When having the value of an at least column element to be equal to 1 in the fault branch searching matrix, then it is determined as node failure, failure
Point is on the branch node that the column element corresponds to branch；
When have in the fault branch searching matrix one value of an at least column element be equal to 1, another value be greater than 1, while have to
A few column element and the column element value are on the contrary, be then determined as failure between node, fault point two column elements opposite in value
On route between corresponding branch node.
5. the electrical power distribution network fault location method according to claim 1-4 based on the multiterminal traveling wave time difference, feature
It is, before the step A, further includes the steps that doing normalized to distribution network line structure, specifically include:
It is according to the following formula that cables all in power distribution network are all equivalent at overhead transmission line:
v1、v2Respectively velocity of wave of the traveling wave in overhead line and cable, LcableFor cable length in power distribution network, LeqReflect length
For LcableThe equivalent length at after overhead transmission line of cable.
6. the electrical power distribution network fault location method according to claim 4 based on the multiterminal traveling wave time difference, which is characterized in that described
After step B, before step C, further include the steps that being modified the element value in the fault branch searching matrix, specifically
Include:
If element value in searching matrix is β, set margin for error as μ, actually when calculating fault search matrix, each member in matrix
The value of element is corrected by following situations:
As 1- μ≤β≤1+ μ, it is modified to β=1；
As β < 1- μ, it is modified to β < 1；
As β > 1+ μ, it is modified to β > 1.
7. the electrical power distribution network fault location method according to claim 1-4 based on the multiterminal traveling wave time difference, feature
It is, the step D includes:
The head end M of main feeder described in power distribution network and end N is matched, foundation two-by-two with branch end where the f of fault point respectively
Both-end fault traveling wave positioning principle calculates fault distance lMfAnd lNf, using the mean value of fault distance as preliminary fault location resultThe positioning result is scaled physical fault distance according to the following formula:
In formula:Indicate physical fault positioning result；l*Length for the practical overhead line for including in the M-f of path.
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