CN109490706A - A kind of multi branch electric power lines road Fault Locating Method - Google Patents
A kind of multi branch electric power lines road Fault Locating Method Download PDFInfo
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- CN109490706A CN109490706A CN201811344688.XA CN201811344688A CN109490706A CN 109490706 A CN109490706 A CN 109490706A CN 201811344688 A CN201811344688 A CN 201811344688A CN 109490706 A CN109490706 A CN 109490706A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
Abstract
A kind of multi branch electric power lines road Fault Locating Method, the Primary Location of fault point is realized using travelling wave ranging, obtain the fault distance between fault point and traveling wave measuring point, screen grid power transmission route, obtain the place on line that the distance between all and traveling wave measuring point is equal to the fault distance, the practical zero-sequence current value obtained using each terminal measuring device measurement, extrapolate the theoretical residual voltage value of each terminal measuring device corresponding with possible abort situation, calculating and the deviation between the theoretical residual voltage value and practical residual voltage value of the corresponding each terminal measuring device of possible abort situation, it is denoted as residual voltage value deviation, compare all residual voltage value deviations, the corresponding possible abort situation of the smallest residual voltage value deviation is true abort situation.Fault location precision is effectively guaranteed in the present invention, compensates for disadvantage of the travelling wave ranging in multipoint line, realizes quickly succinct fault location.
Description
Technical field
The present invention relates to transmission line fault location technology field more particularly to a kind of multi branch electric power lines road fault location
Method.
Background technique
In the power system, it after short trouble occurs for transmission line of electricity, needs to search fault point by fault location technology,
To be repaired in time to fault point, guarantee the power supply reliability of power grid.Currently, existing fault location technology either hinders
Anti- method or traveling wave method, ranging application range is narrow, is all that fault location is carried out in uniline or simple network,
It is not applied for multipoint line.And now with the interconnection of power grid, multidrop line line structure has become ubiquitous, therefore having must
It to be directed to multipoint line, invents a kind of Fault Locating Method.
In all fault location technology, positioning accuracy is preferably traveling wave location technology.But in traveling wave location technology
In, either single-ended traveling wave method or both-end traveling wave method, if by force in multipoint line, it is necessary in the multiple of power grid
Traveling wave measuring point is all installed in position, and both-end rule must be synchronous traveling wave measuring point, and the measuring point quantity and installation position installed
It can guarantee and the whole network route is detected.In this case, it is possible to according to the individual fault location of each measuring point as a result, synthesis is examined
Consider, determines true abort situation place.But it need to be installed in each multiple positions due to the thinking in order to realize that the time measures
Traveling wave measurement or wave recording device when high-precision real, this invests huge for a large amount of distribution line.In addition, if fault wave
Shape or time indeterminacy, then error still can be larger, will be not achieved between the result of each traveling wave measuring point and work in coordination even
It is contradictory, pinpoint effect is not achieved instead, in addition, the thinking even cannot all accomplish completely in major network transmission line of electricity,
If be generalized in the multipoint line of general aspects, difficulty will be huger.Therefore, it adopts this method to solve more points
Fault-location problem on branch transmission line of electricity not only it is infeasible also It is not necessary to.
In conclusion being directed to multi branch electric power lines road, not yet discovery is able to solve and solves its fault location very well at present
Method.So being badly in need of a kind of method for fast and effeciently realizing multi branch electric power lines road fault location.
Summary of the invention
The present invention provides a kind of multi branch electric power lines road Fault Locating Method, fault location precision is effectively guaranteed, more
Disadvantage of the travelling wave ranging in multipoint line has been mended, has realized quickly succinct fault location.
In order to achieve the above object, the present invention provides a kind of multi branch electric power lines road Fault Locating Method, includes following step
It is rapid:
In grid collapses, the fault data for extracting traveling wave measuring point carries out travelling wave ranging, obtains fault point and traveling wave
Fault distance between measuring point；
According to the fault distance between the fault point being calculated and traveling wave measuring point, grid power transmission route is screened, institute is obtained
There is the distance between traveling wave measuring point to be equal to the place on line of the fault distance, as possible abort situation；
The practical zero-sequence current value obtained using each terminal measuring device measurement, is extrapolated under possible abort situation
Each subtransmission route zero-sequence current value, and then calculate each subtransmission route corresponding residual voltage drop, then
Further extrapolate the theoretical residual voltage value of each terminal measuring device corresponding with possible abort situation；
Calculate the theoretical residual voltage value and practical zero sequence of each terminal measuring device corresponding with possible abort situation
Deviation between voltage value is denoted as residual voltage value deviation；
Compare all residual voltage value deviations, the corresponding possible abort situation of the smallest residual voltage value deviation is
True abort situation.
Traveling wave measuring point is arranged in any one terminal measuring device.
The side of the theoretical residual voltage value of calculating each terminal measuring device corresponding with possible abort situation
Method comprises the steps of:
Assuming that there is n possible abort situation, number consecutively is carried out to it: 1,2 ..., i ..., n；Assuming that there is m terminal
Measuring device carries out number consecutively to it: 1,2 ..., j ..., m；K intermediate node in multi branch electric power lines road is successively compiled
Number M1, M2 ..., Mk；Assume initially that the zero-sequence current initial value on each subtransmission route is 0；
Step 1 is directed to abort situation i that may be present, calculates terminal measuring device j to possible abort situation i institute
The specific path passed through, it is assumed that its path is j-M3-M5-M2-i；
Step 2, the zero-sequence current I that will be measured on terminal measuring device jjIt is sequentially overlaid in step S4.1 and determines
Each subtransmission route in the path got off: j-M3, M3-M5, M5-M2, M2-i；
Step 3 repeats step 1 and step 2, and all 1~m of terminal measuring device are divided to the path of abort situation i
It does not calculate, and obtains final superimposed zero-sequence current value on each subtransmission route；
Step 4, by the zero-sequence current value of each subtransmission route multiplied by the zero sequence impedance of its respective branches transmission line of electricity,
It obtains the residual voltage drop of subtransmission route, and the reversed successively regressive in the path being calculated by step 1, obtains measurement dress
Set the corresponding theoretical residual voltage value of j；The corresponding theoretical residual voltage value of other measuring devices and so on calculating；It finally will be
The theoretical residual voltage value of 1~m of all terminal measuring devices under possible abort situation i saves as one group of data.
The theoretical residual voltage value and reality of the corresponding each terminal measuring device of the possible abort situation of calculating
The method of deviation between residual voltage value comprises the steps of:
Step 1, for numbering the corresponding theoretical residual voltage value in the possible breakdown position for being i, surveyed for a certain terminal
The practical residual voltage for measuring device j, is indicated in the form of rectangular co-ordinate:Its corresponding theoretical residual voltage are as follows:UsingCalculate its difference, in formula,For practical residual voltage phasor；Xr
For the real part of practical residual voltage phasor；XiFor the imaginary part of practical residual voltage phasor；For theoretical residual voltage phasor；Xr' is
The real part of theoretical residual voltage phasor；Xi' is the imaginary part of theoretical residual voltage phasor；
Step 2, the difference for calculating all terminal measuring device: E1, E2 ..., Ej ..., Em；
Step 3, summation Si=E1+E2+ ...+Ej+Em, obtain possible abort situation corresponding each end that number is i
Hold the whole deviation Si of measuring device.
The method that the present invention is combined with travelling wave ranging with the zero sequence current criterion of network terminal measuring device, not only
The high advantage of travelling wave ranging positioning accuracy is utilized, and spurious glitches point is identified by introducing zero-sequence current, voltage
And it excludes that it is defeated that the application range of travelling wave ranging has been extended to multiple-limb to make up disadvantage of the travelling wave ranging in multipoint line
It in line fault positioning, can effectively realize after short trouble occurs for multi branch electric power lines road, accurately identification is out of order
Where position, route generation asymmetry is connect suitable for current complex electric network (not including overhead line-cable mixing situation) structure
It is difficult to confirm the occasion of abort situation after ground short circuit failure.
Detailed description of the invention
Fig. 1 is a kind of flow chart of multi branch electric power lines road Fault Locating Method provided by the invention.
Fig. 2 is the flow chart of travelling wave ranging method.
Fig. 3 is the flow chart of theoretical residual voltage value calculating method.
Fig. 4 is the flow chart of the deviation calculation method between theoretical residual voltage value and practical residual voltage value.
Specific embodiment
Below according to FIG. 1 to FIG. 4, presently preferred embodiments of the present invention is illustrated.
At present in traveling wave method either in the manufacture of high-frequency sampling apparatus, or it is accurate in the wave head recognition methods of traveling wave
Have in property and be obviously improved, to ensure that traveling wave method can obtain higher positioning accuracy.This is traveling wave method in power transmission line
Vast application prospect is provided in terms of the fault location of road.Although application of the travelling wave ranging on multi branch electric power lines road is limited
System, but in the present invention, the measurement of fault distance is realized first with travelling wave ranging, in conjunction with other identifications proposed by the present invention
Method carries out the judgement of spurious glitches point, to not only ensure that the advantage of high fault location precision, in addition, it is also applied model
It encloses and has been extended in the multi branch electric power lines road that it is bad at.And basis of the invention is that a traveling wave measuring point is needed to carry out traveling wave
The zero-sequence current and residual voltage that measurement and the measuring device measurement of the other each terminals of power grid obtain.
As shown in Figure 1, the present invention provides a kind of multi branch electric power lines road Fault Locating Method comprising the steps of:
Step S1, electrical quantity fault data (zero-sequence current data and the zero sequence of each terminal measuring device in power grid are acquired
Voltage data)；
Step S2, a terminal measuring device is arbitrarily selected (only to need to select one traveling wave measuring point is arranged in power grid
Terminal can choose the bus being connected with system as the traveling wave measuring point as measuring point), and in grid collapses,
The fault data for extracting traveling wave measuring point carries out travelling wave ranging, obtains the fault distance between fault point and traveling wave measuring point；
Step S3, according to the fault distance between the fault point being calculated and traveling wave measuring point, grid power transmission route is screened,
The place on line that the distance between all and traveling wave measuring point is equal to the fault distance is obtained, as possible abort situation；
Step S4, it is directed to some possible abort situation, practical zero obtained using each terminal measuring device measurement
Sequence current value, extrapolates the zero-sequence current value of each subtransmission route under the possible abort situation, and then calculates
The corresponding residual voltage drop of each subtransmission route, further extrapolates the theoretical residual voltage of each terminal measuring device
Value；
Step S5, the corresponding each terminal measuring device of some possible abort situation that will be calculated in step 4
Theoretical residual voltage value compared with the obtained practical residual voltage value of measurement, calculate theoretical residual voltage value and practical zero
Deviation between sequence voltage value is denoted as residual voltage value deviation；
Step S6, step S4~S5 is repeated, residual voltage value deviation corresponding to all possible abort situation is obtained,
Compare residual voltage value deviation, the corresponding possible abort situation of the smallest residual voltage value deviation is true fault bit
It sets.
In step S2, the present invention only needs travelling wave ranging to can be realized the calculating of fault distance, without obtain it is specific therefore
Hinder position place.Therefore, it is necessary to select suitable travelling wave ranging method.Currently, although traveling wave inherent frequency method cannot be applied
Multipoint line, but under multipoint line, it can not be interfered by the mixing of multiple traveling waves, judge fault point to traveling wave measuring point
Fault distance, so that multiple possible breakdowns point position present in multipoint line be screened.
As shown in Fig. 2, the travelling wave ranging method comprises the steps of:
Step S2.1, the failure electrical quantity of traveling wave measuring point is extracted；
Step S2.2, the phase sequence for carrying out failure electrical quantity is decomposed, and is converted decomposition using triumphant human relations boolean and is obtained 0, ɑ, β modulus
(0, ɑ, β modulus be that phase-model transformation is carried out to A, B, C three-phase, so that A, B, C three-phase electrical quantity that three-phase line is intercoupled become
It is mutually indepedent between each modulus for the modulus of decoupling, it is similar to positive sequence, negative phase-sequence, zero-sequence component)；
Step S2.3, modulus appropriate is taken, carrying out each frequency component calculating of traveling wave, (method for calculating intrinsic frequency has very
It is more, including back forecast Prony algorithm, Multiple Signal Classification (Multiple Single Classification, MUSIC) algorithm
Variation mode decomposition (VMD) etc., VMD algorithm reliability is higher at present), it is to go that maximum value is corresponding in frequency components
Wave intrinsic frequency principal component, the corresponding ingredient is that fault point is divided to the frequency that the catadioptric wave between traveling wave measuring point is formed
Amount, the corresponding relationship of frequency and fault distance are as follows: lf=(θ1-θf)vk/fk, in formula, lfFor fault distance, θ1、θfIt is respectively female
Line measurement end angle of reflection corresponding with fault point；vkFor intrinsic frequency principal component fkCorresponding velocity of wave；fkFor intrinsic frequency it is main at
Point；
Step S2.4, according to traveling wave inherent frequency principal component and fault distance one-to-one relationship, it is right under principal component to obtain
The fault distance l answeredf。
In the step S3, in conjunction with the specific structure of power grid, according to the fault distance l being calculated in step S2f, will
It is all in grid power transmission route to be equal to fault distance lfPlace on line select, then true abort situation must be included in this
In a little positions, other positions are then the spurious glitches position interfered.Therefore, by subsequent step to spurious glitches position into
Row excludes one by one.
In step S4, it is assumed that have n possible abort situation, carry out number consecutively to it: 1,2 ..., i ..., n；Assuming that
Have m terminal measuring device, number consecutively carried out to it: 1,2 ..., j ..., m；To the intermediate node in multi branch electric power lines road
(assuming that having k node) number consecutively M1, M2 ..., Mk；Assume initially that the zero-sequence current initial value on each subtransmission route
It is the electric current i on 0, such as M1-M2 branchM1-M2=0.
As shown in figure 3, the theoretical zero sequence of calculating each terminal measuring device corresponding with possible abort situation
The method of voltage value comprises the steps of:
Step S4.1, it is directed to abort situation i that may be present, calculates terminal measuring device j to possible abort situation i
The specific path passed through, it is assumed that its path is j-M3-M5-M2-i；
Step S4.2, the zero-sequence current I that will be measured on terminal measuring device jjIt is sequentially overlaid in step S4.1
Each subtransmission route in the path decided: j-M3, M3-M5, M5-M2, M2-i, such as: iJ-M3 (new)=iJ-M3 (old)+
Ij, in formula, iJ-M3 (old)For the zero-sequence current value of the j-M3 before this superposition；IjTo need increased zero sequence electricity when this superposition
Flow valuve, i.e., because terminal j measures zero-sequence current IjIt needs by j-M3 branch, then in iJ-M3 (old)On the basis of be superimposed IjTo j-M3
Branch；iJ-M3 (new)For the newest zero-sequence current value of the j-M3 after this superposition, that is, after the zero sequence current measurement value for considering terminal j
J-M3 branch zero-sequence current value；
Step S4.3, step S4.1 and step S4.2 is repeated, by all 1~m of terminal measuring device to abort situation i's
Path all calculates separately out, and obtains final superimposed zero-sequence current value on each subtransmission route；
Step S4.4, the zero-sequence current value of each subtransmission route is hindered multiplied by the zero sequence of its respective branches transmission line of electricity
Anti-, the reversed successively regressive in the path for obtaining the residual voltage drop of subtransmission route, and being calculated by step S4.1 obtains
The corresponding theoretical residual voltage value of measuring device j；The corresponding theoretical residual voltage value of other measuring devices and so on calculating；Most
The theoretical residual voltage value of 1~m of all terminal measuring devices at possible abort situation i saves as one group of data at last.
In step S5, for numbering the corresponding theoretical residual voltage value in the possible breakdown position for being i, as shown in figure 4, institute
The theoretical residual voltage value and practical residual voltage value for the corresponding each terminal measuring device of the possible abort situation of calculating stated
Between the method for deviation comprise the steps of:
Step S5.1, it for the practical residual voltage of a certain terminal measuring device j, is indicated in the form of rectangular co-ordinate:Its corresponding theoretical residual voltage are as follows:UsingCalculate it
Difference, in formula,For practical residual voltage phasor；XrFor the real part of practical residual voltage phasor；XiFor practical residual voltage phasor
Imaginary part；For theoretical residual voltage phasor；Xr' is the real part of theoretical residual voltage phasor；Xi' is theoretical residual voltage phasor
Imaginary part；
Step S5.2, calculate the difference of all terminal measuring device: E1, E2 ..., Ej ..., Em；
Step S5.3, sum Si=E1+E2+ ...+Ej+Em, and it is corresponding each to obtain the possible abort situation that number is i
The whole deviation Si of terminal measuring device.
In the step S6, step S4~S5 is repeated, obtains the corresponding whole deviation of all 1~n of possible breakdown position:
S1, S2 ..., Si ..., Sn, each whole deviation is compared, the corresponding possible abort situation of deviation minimum value is electricity
True abort situation in net.
The present invention passes through travelling wave ranging method first and determines fault point to the fault distance l between traveling wave measuring pointf, thus
Fault location precision is effectively guaranteed, filters out possible abort situation to be subsequent and lays foundation.For the failure being calculated
Distance lf, fault distance l will be met in power grid firstfPossible breakdown position all find.According to possible abort situation knot
The zero-sequence current for closing terminal measuring device, calculates the corresponding zero-sequence current of each branch, and then find out the corresponding zero sequence of branch
The theoretical value and measured value are compared to obtain the deviation of the two, compare institute by the theoretical residual voltage value of voltage drop and each terminal
The corresponding deviation of some 1~n of possible breakdown position, the corresponding abort situation of deviation minimum value is true abort situation,
Although being related to the calculating of residual voltage, avoid and calculated using complicated short circuit calculation method, but converts and think
Road is replaced using simpler direct method, realizes the quick succinct of algorithm.By above step, the present invention can be with
It is correct to exclude spurious glitches position, true abort situation is screened, the special of positioning accuracy and multiple-limb has been taken into account
Structure has certain practical significance.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (4)
1. a kind of multi branch electric power lines road Fault Locating Method, which is characterized in that comprise the steps of:
In grid collapses, the fault data for extracting traveling wave measuring point carries out travelling wave ranging, obtains fault point and traveling wave measuring point
Between fault distance；
According to the fault distance between the fault point being calculated and traveling wave measuring point, screen grid power transmission route, obtain it is all with
The distance between traveling wave measuring point is equal to the place on line of the fault distance, as possible abort situation；
The practical zero-sequence current value obtained using each terminal measuring device measurement, is extrapolated each under possible abort situation
The zero-sequence current value of a subtransmission route, and then calculate each subtransmission route corresponding residual voltage drop, then into one
Step extrapolates the theoretical residual voltage value of each terminal measuring device corresponding with possible abort situation；
The theoretical residual voltage value of calculating each terminal measuring device corresponding with possible abort situation and practical residual voltage
Deviation between value is denoted as residual voltage value deviation；
Compare all residual voltage value deviations, the corresponding possible abort situation of the smallest residual voltage value deviation is as true
Abort situation.
2. multi branch electric power lines road as described in claim 1 Fault Locating Method, which is characterized in that the setting of traveling wave measuring point is in office
It anticipates in a terminal measuring device.
3. multi branch electric power lines road as described in claim 1 Fault Locating Method, which is characterized in that the calculating and possibility
The method of theoretical residual voltage value of the corresponding each terminal measuring device of abort situation comprise the steps of:
Assuming that there is n possible abort situation, number consecutively is carried out to it: 1,2 ..., i ..., n；Assuming that there is m terminal measurement
Device carries out number consecutively to it: 1,2 ..., j ..., m；To k intermediate node number consecutively in multi branch electric power lines road
M1,M2,…,Mk；Assume initially that the zero-sequence current initial value on each subtransmission route is 0；
Step 1 is directed to abort situation i that may be present, calculates terminal measuring device j and is passed through to possible abort situation i
Specific path, it is assumed that its path be j-M3-M5-M2-i；
Step 2, the zero-sequence current I that will be measured on terminal measuring device jjIt is sequentially overlaid in step S4.1 and decides
Path in each subtransmission route: j-M3, M3-M5, M5-M2, M2-i；
Step 3 repeats step 1 and step 2, and all 1~m of terminal measuring device to the path of abort situation i are counted respectively
It calculates, and obtains final superimposed zero-sequence current value on each subtransmission route；
Step 4, by the zero-sequence current value of each subtransmission route multiplied by the zero sequence impedance of its respective branches transmission line of electricity, obtain
The residual voltage of subtransmission route drops, and the reversed successively regressive in the path being calculated by step 1, obtains measuring device j
Corresponding theory residual voltage value；The corresponding theoretical residual voltage value of other measuring devices and so on calculating；It finally will be can
The theoretical residual voltage value of 1~m of all terminal measuring devices under the abort situation i of energy saves as one group of data.
4. multi branch electric power lines road as claimed in claim 3 Fault Locating Method, which is characterized in that the calculating is possible
The side of deviation between the theoretical residual voltage value and practical residual voltage value of the corresponding each terminal measuring device of abort situation
Method comprises the steps of:
Step 1, for numbering the corresponding theoretical residual voltage value in the possible breakdown position for being i, measure and fill for a certain terminal
The practical residual voltage for setting j, is indicated in the form of rectangular co-ordinate:Its corresponding theoretical residual voltage are as follows:UsingCalculate its difference, in formula,For practical residual voltage phasor；
XrFor the real part of practical residual voltage phasor；XiFor the imaginary part of practical residual voltage phasor；For theoretical residual voltage phasor；Xr'
For the real part of theoretical residual voltage phasor；Xi' is the imaginary part of theoretical residual voltage phasor；
Step 2, the difference for calculating all terminal measuring device: E1, E2 ..., Ej ..., Em；
Step 3, summation Si=E1+E2+ ...+Ej+Em obtain the corresponding each terminal of possible abort situation that number is i and survey
Measure the whole deviation Si of device.
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| CN110703033A (en) * | 2019-09-17 | 2020-01-17 | 国电南瑞科技股份有限公司 | Weak fault traveling wave signal enhancement method |
| CN111474447A (en) * | 2020-04-10 | 2020-07-31 | 三峡大学 | Asymmetric transmission line fault positioning method based on single-ended traveling wave method |
| CN112132052A (en) * | 2020-09-24 | 2020-12-25 | 三峡大学 | Power transmission line short-circuit fault diagnosis method based on first-layer wide convolution kernel depth residual error network |
| CN112305378A (en) * | 2020-10-21 | 2021-02-02 | 中国科学院声学研究所南海研究站 | Photoelectric composite submarine cable fault distance measurement system and fault distance measurement method |
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