CN110456227A - A kind of Single Terminal Traveling Wave Fault Location method of distribution line - Google Patents
A kind of Single Terminal Traveling Wave Fault Location method of distribution line Download PDFInfo
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- CN110456227A CN110456227A CN201910780450.XA CN201910780450A CN110456227A CN 110456227 A CN110456227 A CN 110456227A CN 201910780450 A CN201910780450 A CN 201910780450A CN 110456227 A CN110456227 A CN 110456227A
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
- G01R31/088—Aspects of digital computing
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Abstract
The present invention provides a kind of Single Terminal Traveling Wave Fault Location methods of distribution line, are used for distribution circuit single-phase earth fault, comprising: obtain the breaker three_phase reclosing moment, acquire the reclosing three-phase traveling wave of measurement point after breaker three_phase reclosing；Fault Phase Selection is carried out to the reclosing three-phase traveling wave of measurement point, determines failure phase traveling wave and non-faulting phase traveling wave；Phase-model transformation processing, the line line wave that the line line wave of construction phase containing failure is mutually constituted with non-faulting are carried out to failure phase traveling wave and non-faulting phase traveling wave；According to the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting, determines and be overlapped brake cable line wave in the superposition component of fault point；According to superposition component and breaker three_phase reclosing moment of the brake cable line wave in fault point is overlapped, the distance between fault point and measurement point of distribution line are determined；Fault distance-finding method provided by the invention, it is applied widely, it is small to power grid impact without acquiring the single-phase coincidence recorder data of regular link, there is good practical performance and economic performance.
Description
Technical field
The present invention relates to technical field of power systems, in particular to a kind of Single Terminal Traveling Wave Fault Location side of distribution line
Method.
Background technique
Distribution line is directly connected with power consumer as power grid end, is the bridge between power grid and user, carries
The vital task that electric energy safe is reliably distributed to user terminal, according to the statistics of national grid, China's generated energy 85% with
On be all that user is conveyed to by power distribution network.Power distribution network is also the district occurred frequently of electric power system fault simultaneously, is shown according to investigation,
The power failure of 90% or more electric system is all due to caused by distribution line failure, and wherein the line is busy that road is total for single-phase grounding fault
85% or more of failure, while most singlephase earth faults are not metallic earthings, transition resistance can be single-ended to tradition
Power frequency distance measuring method produces bigger effect.
The development of China's power distribution network increasingly accelerates in recent years, and the scale of power distribution network also constantly expands, number of branches increase,
Line length increases, and power load sharply increases, so that power distribution network becomes to become increasingly complex.Compared with transmission line of electricity, distribution wire
Road has the characteristics that itself is exclusive, and the distribution line in China generally uses neutral non-effective grounding mode, i.e. neutral point does not connect
Ground or neutral point are through arc suppression coil or big resistance eutral grounding.Closed loop configuration open loop operation mode is used in structure, route operates normally
Shi Duowei radial structure, line length is short, and line sectionalizing is more, the presence of branch's load and cable, overhead line mixed connection route
A large amount of wave impedance discontinuity point can be generated.It is influenced by factors such as technology, cost, enforcement difficulties, distribution line is not adopted generally
It being replaced with space, this will lead to line parameter circuit value asymmetrical three-phase, meanwhile, the access of out-of-balance load and each phase institute on-load are not
Balance, this will lead to load asymmetrical three-phase again, so, distribution line is it is difficult to ensure that symmetry system having symmetry is run.Therefore, when failure is sent out
When raw, fast and accurately fault point, can not only eliminate failure in time and shorten power off time, and can save manpower object
Power suffers from highly important realistic meaning to safe and stable, the economical operation of distribution system.
In existing fault localization side, single-ended traveling wave method, which implements, to be relatively easy to, but the core of single-ended method needs to identify event
Hinder point reflection wave, and in distribution line, the presence of a large amount of wave impedance discontinuity poinies generates very big interference to Single Terminal Traveling Wave Fault Location,
Algorithm is caused to fail, distance measurement result error.Therefore, after individual event ground fault occurs for power distribution circuit, such as why not being obstructed to resist does not connect
The problem of continuous point, transition resistance, system operation mode and load variations influence, are current urgent need to resolve.
Summary of the invention
The present invention is directed at least solve one of the technical problems existing in the prior art.
Of the invention provides a kind of Single Terminal Traveling Wave Fault Location method of distribution line.
In view of above-mentioned, a kind of Single Terminal Traveling Wave Fault Location method of distribution line is provided according to the present invention, is used for distribution line
Singlephase earth fault, comprising: obtain the breaker three_phase reclosing moment, acquire the coincidence of measurement point after breaker three_phase reclosing
Lock three-phase traveling wave；Fault Phase Selection is carried out to the reclosing three-phase traveling wave of measurement point, determines failure phase traveling wave and non-faulting phase traveling wave；
Revised Karenbauer (card human relations Bauer) matrix is obtained, by revised Karenbauer (card human relations Bauer) matrix to event
Hinder phase traveling wave and non-faulting phase traveling wave carries out phase-model transformation processing, is mutually constituted with obtaining the line line wave of the phase containing failure with non-faulting
Line line wave；According to the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting, determines and be overlapped brake cable line wave
Superposition component in fault point；According to superposition component and breaker three_phase reclosing moment, determine between fault point and measurement point
Distance；Wherein, reclosing three-phase traveling wave includes three-phase voltage traveling wave or three-phase current traveling wave, can be pacified according to live mutual inductor
Fill situation and requirement of engineering unrestricted choice.
In the technical scheme, a kind of Single Terminal Traveling Wave Fault Location method for distribution circuit single-phase earth fault is provided,
When distribution line occur singlephase earth fault when, breaker can automatic three_phase reclosing, distribution line reclosing three-phase voltage or
Current traveling wave is coupled, three-phase line is mutual in communication process by being overlapped equivalent source generation on the line since route exists
Mutually influence.Therefore it needs first to carry out Fault Phase Selection to reclosing three-phase traveling wave, determines be out of order phase and non-faulting phase, then by repairing
Three-phase decoupling is realized in Karenbauer (card human relations Bauer) transformation after just, to obtain the line line wave and non-faulting of the phase containing failure
The line line wave mutually constituted, it is last that fault point is determined with the line line wave that non-faulting is mutually constituted according to the line line wave of the phase containing failure
It is superimposed component, is calculated between fault point and measurement point according to obtained superposition component and collected three_phase reclosing moment
Accurate distance.Distance measurement result is not remembered the shadow of load variations by wave impedance discontinuity point, transition resistance, system operation mode
It rings, can accurately and effectively determine position of failure point, voltage traveling wave and current traveling wave are applicable in, it is applied widely, it does not need
Other situation reclosing recorder datas, it is small to power grid impact, there is good practical performance and economic performance.
In the above-mentioned technical solutions, it is preferable that phase-model transformation processing tool is carried out to failure phase traveling wave and non-faulting phase traveling wave
Body includes: to obtain revised Karenbauer matrix；By revised Karenbauer matrix to failure phase traveling wave and non-
Failure phase traveling wave carries out the phase mould conversion of non-symmetrical line, the line mutually constituted with the line line wave of the determining phase containing failure with non-faulting
Line wave.
In the technical scheme, it in power distribution network, is influenced by factors such as cost, investment and difficulty of construction, distribution line
It does not generally take three-phase to replace, therefore line parameter circuit value asymmetrical three-phase, phase is carried out to reclosing three-phase traveling wave using phase-model transformation
When mould change process, need to be modified Karenbauer (card human relations Bauer) matrix, to realize non-symmetrical line three-phase solution
Coupling.
In the above-mentioned technical solutions, it is preferable that obtain revised Karenbauer matrix, specifically include: obtaining wave resistance
Anti- matrix；Correction matrix is obtained, and Karenbauer (card human relations Bauer) matrix is modified to be repaired by correction matrix
Karenbauer (card human relations Bauer) matrix after just；It is obtained by the following formula revised Karenbauer matrix:
S'ZS'-1=HSZS-1H-1=Zλ
Wherein, a, b, c are route three-phase, and Z is surge impedance of a line matrix, and H is correction matrix, and S' is revised
Karenbauer (card human relations Bauer) matrix, ZλFor revised surge impedance of a line matrix, ZλFor diagonal matrix, λαλβλ0Respectively α β
0 mould wave impedance.
In the technical scheme, if when route three-phase symmetrical, generally directly using Karenbauer (card human relations Bauer) change
Swap-in row phase-model transformation realizes and decouples to the three-phase of wave impedance matrix, but in line parameter circuit value asymmetrical three-phase, needs pair
Karenbauer (card human relations Bauer) matrix is modified.
In the above-mentioned technical solutions, it is preferable that the step of obtaining wave impedance matrix, comprising: be obtained by the following formula line
Road wave impedance matrix:
Wherein, Z is surge impedance of a line matrix element, and L is line inductance parameter, and C is line capacitance parameter.
In the technical scheme, it can be calculated by above-mentioned formula using the inductance parameters of route and the capacitance parameter of route
Obtain each element in surge impedance of a line matrix.
In the above-mentioned technical solutions, it is preferable that determine the line line that the line line wave of the phase containing failure is mutually constituted with non-faulting
Wave specifically includes: reclosing three-phase traveling wave is three-phase voltage traveling wave, and failure phase traveling wave is mutually gone with non-faulting by following formula
Wave carries out the phase-model transformation processing of non-symmetrical line, by taking a phase ground fault as an example:
Wherein, a phase is failure phase, YαIndicate the line line wave of the phase containing failure, YγIndicate the line line that non-faulting is mutually constituted
Wave, UaIndicate a phase voltage traveling wave, that is, faulted phase voltage traveling wave, Ub、UcRespectively indicate b, c phase voltage traveling wave i.e. non-faulting phase voltage
Traveling wave, zabIndicate the mutual wave impedance of ab, zacIndicate the mutual wave impedance of ac, zbcIndicate the mutual wave impedance of bc.
In the above-mentioned technical solutions, it is preferable that determine the line that the line line wave of the phase containing failure is mutually constituted with the non-faulting
Line wave specifically includes: reclosing three-phase traveling wave is three-phase current traveling wave, by following formula by failure phase traveling wave and non-faulting
Phase traveling wave carries out the phase-model transformation processing of non-symmetrical line, by taking a phase ground fault as an example:
Wherein, a phase is failure phase, YαIndicate the line line wave of the phase containing failure, YγIndicate the line line that non-faulting is mutually constituted
Wave, IaIndicate a phase current traveling wave, that is, faulted phase current traveling wave, Ib、IcRespectively indicate b, c phase current traveling wave i.e. non-faulting phase current
Traveling wave, ZaIndicate a phase from wave impedance, ZbIndicate b phase from wave impedance, ZcIndicate c phase from wave impedance, zabIndicate the mutual wave impedance of ab,
zacIndicate the mutual wave impedance of ac, zbcIndicate the mutual wave impedance of bc.
In the technical scheme, reclosing three-phase traveling wave can use three-phase voltage traveling wave or three-phase current traveling wave, lead to
It crosses the line line wave that different formula mutually constitutes the line line wave and non-faulting of the phase containing failure to calculate, electric system three
Mutually difference a phase, b phase, c phase, by taking a phase is grounded as an example, i.e., a phase is failure phase, and b, c phase are non-faulting phase, i.e. a phase voltage traveling wave is
Faulted phase voltage traveling wave, b, c phase voltage traveling wave be non-faulting phase voltage traveling wave, a phase current traveling wave be faulted phase current traveling wave, b,
C phase current traveling wave determines the line mould of failure phase by three-phase voltage traveling wave or three-phase current traveling wave for non-faulting phase current traveling wave
The line line wave that traveling wave is mutually constituted with non-faulting realizes and is converted according to different formulas to the unified of different type traveling wave, makes event
Barrier point distance measuring method applicability is stronger.
In the above-mentioned technical solutions, it is preferable that the line line mutually constituted according to the line line wave of the phase containing failure with non-faulting
Wave determines and is overlapped brake cable line wave the superposition component of fault point the step of, specifically includes: respectively to the line line of the phase containing failure
Wave is normalized with the line line wave that non-faulting is mutually constituted；By following formula to the line of the phase containing failure after normalization
Line wave is calculated with the line line wave that non-faulting is mutually constituted, and is overlapped brake cable line wave in the superposition point of fault point to determine
Amount:
Wherein,Indicate it is described coincidence brake cable line wave fault point superposition component,After indicating the normalization
The line line wave of the phase containing failure,The line line wave that non-faulting after indicating the normalization is mutually constituted.
In the technical scheme, according to the non-faulting phase structure after the line line wave of the phase containing failure after normalization and normalization
At line line wave can construct and be overlapped brake cable line wave only in the superposition component of fault point, therefore and according to principle of stacking
When carrying out fault point ranging, without acquiring the single-phase coincidence recorder data of regular link, it is not required to data storage, alignment of data, is subtracted
The small combined floodgate to power grid impacts.
In the above-mentioned technical solutions, it is preferable that the line mould that the line line wave of the phase containing failure is mutually constituted with non-faulting respectively
Traveling wave is normalized, comprising: the line mould being mutually made up of line line wave of the following formula to the phase containing failure with non-faulting
Traveling wave is normalized:
Wherein,The line line wave of the phase containing failure after indicating normalization,Non-faulting after indicating normalization is mutually constituted
Line line wave, YαIndicate the line line wave of the phase containing failure, MαIndicate the first modulus maximum of the line line wave of the phase containing failure, Yγ
Indicate the line line wave that non-faulting is mutually constituted, MγIndicate the first modulus maximum for the line line wave that non-faulting is mutually constituted.
In the technical scheme, using wavelet transformation modulus maximum, first modulus maximum and its out current moment are determined, then
It is normalized according to line line wave of the first modulus maximum to the phase containing failure with non-faulting phase line line wave, according to returning
The line line wave that the one line line wave for changing treated the phase containing failure is mutually constituted with non-faulting obtains only faults point information
It is superimposed component.
In the above-mentioned technical solutions, it is preferable that be calculated by the following formula Wavelet Component:
Wherein, f (n) indicates the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting,Indicate jth
The approximation component of scale,Indicate the Wavelet Component of jth scale, h (k), g (k) respectively indicate corresponding filter ginseng
Number, ηjIndicate the construction coefficient of j scale；It is calculated by the following formula modulus maximum:
Wherein,Indicate the modulus maximum of the wavelet transformation of jth scale,Indicate the kth in current layer
The Wavelet Component of the jth scale of point data.
In the technical scheme, it is converted by adjusting filter parameter and multi-level Wavelet Transform, can reduce distribution line list
The error of travelling wave ranging is held, guarantees the accuracy of fault point ranging.
In the above-mentioned technical solutions, it is preferable that calculated according to superposition component with Reclosing Instant, to obtain fault point
The distance between measurement point, specifically includes: the distance between fault point and measurement point are determined by following formula:
Wherein, x indicates the distance between fault point and measurement point, t1Indicate Reclosing Instant, t2It indicates to be overlapped brake cable line
The arrival time of wave i.e. first fault point back wave at the time of first modulus maximum of the superposition component of fault point corresponds to, v
Indicate the line mould wave velocity of reclosing traveling wave.
In the technical scheme, the first of component is superimposed fault point according to Reclosing Instant, coincidence brake cable line wave
At the time of modulus maximum corresponds to and the line mould wave velocity of three-phase voltage traveling wave or three-phase current traveling wave, pass through formula calculate determine therefore
The distance between barrier point and measurement point, to be quickly and accurately positioned fault point, mitigate line walking burden, are conducive to acceleration disturbance inspection
It repairs and restores electricity, reduce the loss of power failure bring, fault localization does not need additionally to install injection device additional, and hardware investment is few, right
Voltage traveling wave and current traveling wave are applicable in, applied widely, and without acquiring the single-phase coincidence recorder data of regular link, to electricity
Net impact is small, has good practical performance and economic performance.
Additional aspect and advantage of the invention will become obviously in following description section, or practice through the invention
Recognize.
Detailed description of the invention
Fig. 1 shows the schematic flow diagram of Single Terminal Traveling Wave Fault Location method according to an embodiment of the invention；
Fig. 2 shows the schematic flow diagrams of Single Terminal Traveling Wave Fault Location method according to another embodiment of the invention；
Fig. 3 shows the schematic flow diagram of the Single Terminal Traveling Wave Fault Location method of still another embodiment in accordance with the present invention；
Fig. 4 shows distribution network schematic diagram according to an embodiment of the invention；
Fig. 5 shows the line mould network diagram of the phase according to an embodiment of the invention containing failure；
Fig. 6 shows the line mould network diagram that non-faulting according to an embodiment of the invention is mutually constituted；
Fig. 7 shows superposition component network schematic diagram in fault point according to an embodiment of the invention.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
Implement in a manner of using other than the one described here, therefore, protection scope of the present invention is not by following public tool
The limitation of body embodiment.
Referring to Fig. 1, one embodiment of the present of invention, proposes a kind of Single Terminal Traveling Wave Fault Location method of distribution line, fit
For distribution circuit single-phase earth fault, wherein this method comprises:
S102 obtains the breaker three_phase reclosing moment, acquires the reclosing three of measurement point after breaker three_phase reclosing
Phase traveling wave；
S104 carries out Fault Phase Selection to the reclosing three-phase traveling wave of measurement point, determines that failure phase traveling wave is mutually gone with non-faulting
Wave；
S106 carries out phase-model transformation processing to failure phase traveling wave and non-faulting phase traveling wave, constructs the line line of the phase containing failure
The line line wave that wave is mutually constituted with non-faulting；
S108 is determined according to the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting and is overlapped brake cable line
Superposition component of the wave in fault point；
S110 is determined according to superposition component and breaker three_phase reclosing moment of the brake cable line wave in fault point is overlapped
The distance between fault point and measurement point.
In this embodiment, distribution line network as shown in Figure 4 is typical distribution line, distribution line and power transmission line
Road is compared, and there are following characteristics for distribution wire: there are a large amount of wave impedance discontinuity poinies for distribution line, in traveling wave detection process, meeting
The catadioptric generation of traveling wave is interfered, and distribution line parameter unbalance, the general non complete symmetry of institute's on-load, n in Fig. 41、
n2、n3、n4Represent each branched line in distribution line, L1、L2、L3、L4、LnRepresent distribution line institute on-load.
A kind of Single Terminal Traveling Wave Fault Location method for distribution circuit single-phase earth fault is present embodiments provided, distribution wire is worked as
When singlephase earth fault occurs for road, breaker can automatic three_phase reclosing, distribution line reclosing three-phase voltage or current traveling wave
By being overlapped equivalent source generation on the line, coupled since route exists, three-phase line interacts in communication process.Cause
This needs first to carry out Fault Phase Selection to reclosing three-phase traveling wave, determines be out of order phase and non-faulting phase, then by revised
Three-phase decoupling is realized in Karenbauer (card human relations Bauer) transformation, so that the line line wave for obtaining the phase containing failure is mutually constituted with non-faulting
Line line wave, the last line line wave according to the phase containing failure determines fault point superposition point with the line line wave that non-faulting is mutually constituted
Amount, it is accurate between fault point and measurement point to be calculated according to obtained superposition component and collected three_phase reclosing moment
Distance.Distance measurement result is not influenced by wave impedance discontinuity point, transition resistance, system operation mode memory load variations, can be with
It accurately and effectively determines position of failure point, voltage traveling wave and current traveling wave is applicable in, it is applied widely, do not need other situations
Reclosing recorder data, it is small to power grid impact, there is good practical performance and economic performance.
Referring to Fig. 2, another embodiment of the invention, proposes a kind of Single Terminal Traveling Wave Fault Location method of distribution line,
Suitable for distribution circuit single-phase earth fault, wherein this method comprises:
S202 obtains the breaker three_phase reclosing moment, acquires the reclosing three of measurement point after breaker three_phase reclosing
Phase traveling wave；
S204 carries out Fault Phase Selection to the reclosing three-phase traveling wave of measurement point, determines that failure phase traveling wave is mutually gone with non-faulting
Wave；
S206 is modified Karenbauer matrix using surge impedance of a line matrix；
S208 is turned by the phase mould that revised Karenbauer matrix carries out non-symmetrical line to reclosing three-phase traveling wave
It changes, determines the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting；
S210 determines the superposition of fault point according to the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting
Component；
S212 determines the distance between fault point and measurement point according to superposition component and breaker three_phase reclosing moment.
Further, it is obtained by the following formula revised Karenbauer matrix:
S'ZS'-1=HSZS-1H-1=Zλ
Wherein, a, b, c are route three-phase, and Z is surge impedance of a line matrix, and H is correction matrix, and S' is revised
Karenbauer matrix, ZλFor revised surge impedance of a line matrix, ZλFor diagonal matrix, λαλβλ0Respectively 0 mould wave impedance of α β.
Further, it is obtained by the following formula the surge impedance of a line matrix:
Wherein, Z is surge impedance of a line matrix element, and L is line inductance parameter, and C is line capacitance parameter.
Specifically include further, it is determined that being overlapped brake cable line wave: reclosing three-phase traveling wave is three-phase voltage traveling wave, is passed through
Following formula handles the phase-model transformation that failure phase traveling wave and non-faulting phase traveling wave carry out non-symmetrical line, with a phase ground fault
For:
Wherein, a phase is failure phase, YαIndicate the line line wave of the phase containing failure, YγIndicate the line line that non-faulting is mutually constituted
Wave, UaIndicate a phase voltage traveling wave, that is, faulted phase voltage traveling wave, Ub、UcRespectively indicate b, c phase voltage traveling wave i.e. non-faulting phase voltage
Traveling wave, zabIndicate the mutual wave impedance of ab, zacIndicate the mutual wave impedance of ac, zbcIndicate the mutual wave impedance of bc.
Specifically include further, it is determined that being overlapped brake cable line wave: reclosing three-phase traveling wave is three-phase current traveling wave, is passed through
Following formula handles the phase-model transformation that failure phase traveling wave and non-faulting phase traveling wave carry out non-symmetrical line, with a phase ground fault
For:
Wherein, a phase is failure phase, YαIndicate the line line wave of the phase containing failure, YγIndicate the line line that non-faulting is mutually constituted
Wave, IaIndicate a phase current traveling wave, that is, faulted phase current traveling wave, Ib、IcRespectively indicate b, c phase current traveling wave i.e. non-faulting phase current
Traveling wave, ZaIndicate a phase from wave impedance, ZbIndicate b phase from wave impedance, ZcIndicate c phase from wave impedance, zabIndicate the mutual wave impedance of ab,
zacIndicate the mutual wave impedance of ac, zbcIndicate the mutual wave impedance of bc.
In this embodiment, it in power distribution network, is influenced by factors such as cost, investment and difficulty of construction, distribution line one
As do not take three-phase to replace, line parameter circuit value asymmetrical three-phase, therefore when route asymmetrical three-phase is needed to Karenbauer
(card human relations Bauer) matrix is modified.
Specifically, each factor in wave impedance matrix is calculated first with the inductance parameters of route and capacitance parameter, obtained
To wave impedance matrix.Then, Karenbauer (card human relations Bauer) matrix is modified.Reclosing three-phase in the technical solution
Traveling wave not only can use three-phase voltage traveling wave but also can use three-phase current traveling wave, by different formula to the line of the phase containing failure
The line line wave that line wave and non-faulting are mutually constituted is calculated, and Three-phase Power Systems distinguish a phase, b phase, c phase, is connected with a
For ground, i.e., a phase is failure phase, and b, c phase are non-faulting phase, i.e., a phase voltage traveling wave is faulted phase voltage traveling wave, b, c phase voltage
Traveling wave is non-faulting phase voltage traveling wave, and a phase current traveling wave is faulted phase current traveling wave, and b, c phase current traveling wave are non-faulting mutually electricity
Popular wave determines the line that the line line wave of failure phase is mutually constituted with non-faulting by three-phase voltage traveling wave or three-phase current traveling wave
Line wave realizes and is converted according to different formulas to the unified of different type traveling wave, keeps fault point distance measuring method applicability stronger.
Wherein as shown in Figure 5 and Figure 6, due to including fault point in the line lay wire network of the phase containing failure to ground leg, so its
The propagation of line line wave is influenced by fault point, and without fault point to ground leg in the line lay wire network that non-faulting is mutually constituted, so
The propagation of its line line wave is not influenced by fault point.
Referring to Fig. 3, yet another embodiment of the present invention, proposes a kind of Single Terminal Traveling Wave Fault Location method of distribution line,
Suitable for distribution circuit single-phase earth fault, wherein this method comprises:
S302 obtains the breaker three_phase reclosing moment, acquires the reclosing three of measurement point after breaker three_phase reclosing
Phase traveling wave；
S304 carries out Fault Phase Selection to the reclosing three-phase traveling wave of measurement point, determines that failure phase traveling wave is mutually gone with non-faulting
Wave；
S306 carries out phase-model transformation processing to failure phase traveling wave and non-faulting phase traveling wave, constructs the line line of the phase containing failure
The line line wave that wave is mutually constituted with non-faulting；
S308 is very big to the line line wave and the line line wave progress wavelet transformation modulus that non-faulting is mutually constituted of the phase containing failure
Value；
The line line wave of the phase containing failure is normalized with the line line wave that non-faulting is mutually constituted, obtains by S310
The line line wave that the line line wave of the phase containing failure after normalization is mutually constituted with non-faulting；
S312 obtains weight according to the line line wave that the line line wave of the phase containing failure after normalization is mutually constituted with non-faulting
Superposition component of the closing line line wave in fault point；
S314 is determined according to superposition component and breaker three_phase reclosing moment of the brake cable line wave in fault point is overlapped
The distance between fault point and measurement point.
Further, it is calculated by the following formula modulus maximum:
Wherein,Indicate the modulus maximum of the wavelet transformation of jth scale,Indicate the kth in current layer
The Wavelet Component of the jth scale of point data；Wavelet Component is calculated by the following formula,
Wherein, f (n) indicates the line line wave that the line line wave of the phase containing failure is mutually constituted with non-faulting,Indicate jth
The approximation component of scale,Indicate the Wavelet Component of jth scale, h (k), g (k) respectively indicate corresponding filter ginseng
Number, ηjIndicate the construction coefficient of j scale.
Further, place is normalized with the line line wave that non-faulting is mutually constituted to the line line wave of the phase containing failure respectively
Reason, comprising: normalizing is carried out with the line line wave that non-faulting is mutually constituted by line line wave of the following formula to the phase containing failure
Change processing:
Wherein,The line line wave of the phase containing failure after indicating the normalization,Non- event after indicating the normalization
Hinder the line line wave mutually constituted, YαIndicate the line line wave of the phase containing failure, MαIndicate the line line wave of the phase containing failure
First modulus maximum, YγIndicate the line line wave that the non-faulting is mutually constituted, MγIndicate the line line that the non-faulting is mutually constituted
The first modulus maximum of wave.
Further, it according to the coincidence brake cable line wave after normalization, determines and is overlapped brake cable line wave in the folded of fault point
It the step of bonus point amount, specifically includes: line line wave and non-faulting phase structure by following formula to the phase containing failure after normalization
At line line wave calculated, with determination it is described be overlapped brake cable line wave fault point superposition component:
Wherein,Indicate it is described coincidence brake cable line wave fault point superposition component,After indicating the normalization
The line line wave of the phase containing failure,The line line wave that non-faulting after indicating the normalization is mutually constituted.
Further, it is calculated according to superposition component with the Reclosing Instant, to obtain the fault point and measurement
The distance between point, specifically includes: determining the distance between the fault point and the measurement point by following formula:
Wherein, x indicates the distance between the fault point and the measurement point, t1Indicate the Reclosing Instant, t2It indicates
I.e. first fault point is anti-at the time of first modulus maximum of superposition component of the coincidence brake cable line wave in fault point corresponds to
The arrival time of ejected wave, v indicate the line mould wave velocity of reclosing traveling wave.
In the implementation, according to Reclosing Instant, brake cable line wave is overlapped in the first mould pole of the superposition component of fault point
At the time of big value is corresponding and the line mould wave velocity of three-phase voltage traveling wave or three-phase current traveling wave, passes through formula and calculate and determine fault point
The distance between measurement point mitigates line walking burden to be quickly and accurately positioned fault point, be conducive to acceleration disturbance maintenance with
It restores electricity, reduces the loss of power failure bring, fault localization does not need additionally to install injection device additional, and hardware investment is few, to voltage
Traveling wave and current traveling wave are applicable in, applied widely, and without acquiring the single-phase coincidence recorder data of regular link, are rushed to power grid
Hit it is small, have good practical performance and economic performance, wherein fault point be superimposed component network it is as shown in Figure 7.
Specifically, de-noising is carried out by adjusting the relevant parameter of filter, determines first modulus maximum, respectively further according to this
The line line wave of the phase containing failure is normalized with non-therefore line line wave for the first modulus maximum occurred, according to normalization
The line line wave that the line line wave of the phase containing failure afterwards is mutually constituted with non-faulting, the fault point for obtaining only faults point information are folded
Bonus point amount.This technical solution is overlapped recorder data when carrying out fault point ranging, without acquiring regular link, is not required to data and deposits
Storage, alignment of data reduce and impact to the combined floodgate of power grid, can be quickly and accurately positioned fault point, mitigate line walking burden, be conducive to
Acceleration disturbance overhauls and restores electricity, and reduces the loss of power failure bring, and fault localization does not need additionally to install injection device, hardware additional
Small investment is applicable in voltage traveling wave and current traveling wave, applied widely, has good practical performance and economic performance.
In the description of this specification, term " first ", " second " are only used for the purpose of description, and should not be understood as indicating
Or imply relative importance, unless otherwise clearly defined and limited；Term " connection ", " installation ", " fixation " etc. should all be done extensively
Reason and good sense solution, for example, " connection " may be fixed connection or may be dismantle connection, or integral connection；It can be direct phase
It even, can also be indirectly connected through an intermediary.For the ordinary skill in the art, it can manage as the case may be
Solve the concrete meaning of above-mentioned term in the present invention.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or reality
Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more of the embodiments or examples with
Suitable mode combines.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of Single Terminal Traveling Wave Fault Location method of distribution line is used for distribution circuit single-phase earth fault, which is characterized in that packet
It includes:
At the time of obtaining breaker three_phase reclosing, the reclosing of the measurement point after acquiring the breaker three_phase reclosing moment
Three-phase traveling wave；
Fault Phase Selection is carried out to the reclosing three-phase traveling wave, determines failure phase traveling wave and non-faulting phase traveling wave；
Phase-model transformation processing is carried out to the failure phase traveling wave and non-faulting phase traveling wave, with obtain the phase containing failure line line wave and
The line line wave that non-faulting is mutually constituted；
According to the line line wave that the line line wave of the phase containing failure is mutually constituted with the non-faulting, determines and be overlapped brake cable line wave
Superposition component in fault point；
Superposition component and the breaker three_phase reclosing moment according to the coincidence brake cable line wave in fault point, determine institute
State the fault point and the distance between the measurement point of distribution line；
Wherein, the reclosing three-phase traveling wave includes three-phase voltage traveling wave or three-phase current traveling wave.
2. the Single Terminal Traveling Wave Fault Location method of distribution line according to claim 1, which is characterized in that mutually go to the failure
Wave and non-faulting phase traveling wave carry out phase-model transformation processing and specifically include:
Obtain revised Karenbauer matrix；
It is not right to be carried out by the revised Karenbauer matrix to the failure phase traveling wave and the non-faulting phase traveling wave
Claim the phase mould conversion of route, the line line wave mutually constituted with the line line wave of the determining phase containing failure with the non-faulting.
3. the Single Terminal Traveling Wave Fault Location method of distribution line according to claim 2, which is characterized in that after the acquisition amendment
Karenbauer matrix the step of, specifically include:
Obtain wave impedance matrix；
Correction matrix is obtained, and by the correction matrix Karenbauer matrix is modified revised to obtain
Karenbauer matrix；
It is obtained by the following formula revised Karenbauer matrix:
S'ZS'-1=HSZS-1H-1=Zλ
Wherein, a, b, c are route three-phase, and Z is surge impedance of a line matrix, and H is correction matrix, and S' is revised Karenbauer
Matrix, ZλFor revised surge impedance of a line matrix, ZλFor diagonal matrix, λαλβλ0Respectively 0 mould wave impedance of α β.
4. the Single Terminal Traveling Wave Fault Location method of distribution line according to claim 3, which is characterized in that obtain wave impedance matrix
The step of, comprising:
It is obtained by the following formula the surge impedance of a line matrix:
Wherein, Z is surge impedance of a line matrix element, and L is line inductance parameter, and C is line capacitance parameter.
5. the Single Terminal Traveling Wave Fault Location method of distribution line according to any one of claim 1 to 4, which is characterized in that really
The line line wave of the fixed phase containing failure is specifically included with the line line wave that the non-faulting is mutually constituted:
The reclosing three-phase traveling wave is three-phase voltage traveling wave, by following formula by the failure phase traveling wave and the non-faulting
Phase traveling wave carries out the phase-model transformation processing of non-symmetrical line, by taking a phase ground fault as an example:
Wherein, a phase is failure phase, YαIndicate the line line wave of the phase containing failure, YγIndicate the line line that non-faulting is mutually constituted
Wave, UaIndicate a phase voltage traveling wave, that is, faulted phase voltage traveling wave, Ub、UcRespectively indicate the i.e. described non-event of b, c phase voltage traveling wave
Hinder phase voltage traveling wave, zabIndicate the mutual wave impedance of ab, zacIndicate the mutual wave impedance of ac, zbcIndicate the mutual wave impedance of bc.
6. the Single Terminal Traveling Wave Fault Location method of distribution line according to any one of claim 1 to 4, which is characterized in that really
The line line wave of the fixed phase containing failure is specifically included with the line line wave that the non-faulting is mutually constituted:
The reclosing three-phase traveling wave is three-phase current traveling wave, by following formula by the failure phase traveling wave and the non-faulting
Phase traveling wave carries out the phase-model transformation processing of non-symmetrical line, by taking a phase ground fault as an example:
Wherein, a phase is failure phase, YαIndicate the line line wave of the phase containing failure, YγIndicate the line line that non-faulting is mutually constituted
Wave, IaIndicate a phase current traveling wave, that is, faulted phase current traveling wave, Ib、IcRespectively indicate the i.e. described non-event of b, c phase current traveling wave
Hinder phase current traveling wave, ZaIndicate a phase from wave impedance, ZbIndicate b phase from wave impedance, ZcIndicate c phase from wave impedance, zabIndicate ab phase
Mutual wave impedance, zacIndicate the mutual wave impedance of ac, zbcIndicate the mutual wave impedance of bc.
7. the Single Terminal Traveling Wave Fault Location method of distribution line according to claim 1, which is characterized in that contain failure according to described
The line line wave that the line line wave of phase is mutually constituted with the non-faulting determines and is overlapped brake cable line wave in the superposition component of fault point
The step of, it specifically includes:
The line line wave of the phase containing failure is normalized with the line line wave that the non-faulting is mutually constituted respectively；
It is counted by line line wave of the following formula to the phase containing failure after normalization with the line line wave that non-faulting is mutually constituted
It calculates, with the determination brake cable line wave that is overlapped in the superposition component of fault point:
Wherein,Indicate it is described coincidence brake cable line wave fault point superposition component,Contain event after indicating the normalization
Hinder the line line wave of phase,The line line wave that non-faulting after indicating the normalization is mutually constituted.
8. the Single Terminal Traveling Wave Fault Location method of distribution line according to claim 7, which is characterized in that respectively to described containing event
The line line wave of barrier phase is normalized with the line line wave that non-faulting is mutually constituted, comprising:
Place is normalized with the line line wave that non-faulting is mutually constituted by line line wave of the following formula to the phase containing failure
Reason:
Wherein,The line line wave of the phase containing failure after indicating the normalization,Non-faulting phase after indicating the normalization
The line line wave of composition, YαIndicate the line line wave of the phase containing failure, MαIndicate the first of the line line wave of the phase containing failure
Modulus maximum, YγIndicate the line line wave that the non-faulting is mutually constituted, MγIndicate the line line wave that the non-faulting is mutually constituted
First modulus maximum.
9. the Single Terminal Traveling Wave Fault Location method of distribution line according to claim 8, which is characterized in that further include:
It is calculated by the following formula the modulus maximum:
Wherein,Indicate the modulus maximum of the wavelet transformation of jth scale,Indicate the kth point data in current layer
Jth scale Wavelet Component；
It is calculated by the following formula the Wavelet Component:
Wherein, f (n) indicates the line line wave that the line line wave of the phase containing failure is mutually constituted with the non-faulting,Table
Show the approximation component of jth scale,Indicate the Wavelet Component of jth scale, h (k), g (k) respectively indicate corresponding filter
Parameter, ηjIndicate the construction coefficient of j scale.
10. the Single Terminal Traveling Wave Fault Location method of distribution line according to any one of claims 7 to 9, which is characterized in that root
It is calculated according to the superposition component with the Reclosing Instant, to obtain the distance between the fault point and measurement point, tool
Body includes:
The distance between the fault point and the measurement point are determined by following formula:
Wherein, x indicates the distance between the fault point and the measurement point, t1Indicate the Reclosing Instant, t2Described in expression
It is overlapped brake cable line wave i.e. first fault point back wave at the time of first modulus maximum of the superposition component of fault point corresponds to
Arrival time, v indicate reclosing traveling wave line mould wave velocity.
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