CN106526424B - A kind of transmission line one-phase earth fault parameter identification method - Google Patents
A kind of transmission line one-phase earth fault parameter identification method Download PDFInfo
- Publication number
- CN106526424B CN106526424B CN201611040399.1A CN201611040399A CN106526424B CN 106526424 B CN106526424 B CN 106526424B CN 201611040399 A CN201611040399 A CN 201611040399A CN 106526424 B CN106526424 B CN 106526424B
- Authority
- CN
- China
- Prior art keywords
- value
- transmission line
- measuring set
- equal
- phasor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- 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
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The present invention provides a kind of transmission line one-phase earth fault parameter identification methods, in transmission line one-phase earth fault parameter identification method provided by the invention, when singlephase earth fault occurs, the phasor measuring set that mixed power transmission line two sides are arranged in measures track data, least square method is improved by using estimation of uncertainty to obtain new estimation of uncertainty, new estimation of uncertainty can be eliminated to be influenced brought by error in measurement even gross error, and then increases the reliability and accuracy of parameter recognition result.Transmission line one-phase earth fault parameter identification method provided by the invention can accurately position the route to break down, thus have a good application prospect.
Description
Technical field
The present invention relates to fault identification technical field more particularly to a kind of transmission line one-phase earth fault parameter identification sides
Method.
Background technique
With the high speed development in modernization cities and towns, city space growing tension, and for transmission line of electricity, overhead line corridor is not
It only needs to occupy a large amount of space resources, and intersects in length and breadth also unsightly in the air, therefore, most of cities use buried cable generation
It transmits electric power for overhead line.A large amount of layings of cable not only beautify the appearance of the city, Optimizing City layout, and the capacity ratio of cable is aerial
Line is much bigger, it is thus possible to improve power factor, improve route transmission capacity.Due to the higher cost of cabling,
Region far from city generally still uses overhead line, so that transmission line of electricity forms overhead lines combined with cable.
The fault distance-finding method of overhead lines combined with cable is generally travelling wave ranging, failure analysis methods and traveling wave method.
Travelling wave ranging mainly includes velocity of wave normalization method and traveling wave time difference method, wherein velocity of wave normalization method passes through to cable or overhead line
Wave velocity and length carry out reduction, and joint line need to be reduced to uniline in reduction and carry out ranging, and calculate event
Hinder distance, to be reconverted into the length of actual track；But this method needs to convert repeatedly, and row wave speed because line parameter circuit value with
And the environment of surrounding influence and certain fluctuation is presented, therefore calculate error it is larger.Traveling wave time difference method passes through fault traveling wave
The time difference for reaching both ends first determines faulty line section, is accurately positioned according to single-ended or both-end traveling wave method, this method
Opposite velocity of wave normalization method is more accurate, but due in cable traveling wave attenuation ratio it is very fast, joint line both ends wave head is difficult to detect, and mixes
The reason of zygonema road wave process complexity etc. and be difficult to judge wavefront source.Fault analytical method is pushed away by both-end voltage, electric current
Tie point voltage, electric current are calculated, branch where determining fault point according to amplitude com parison, the last relevant parameter according to fault branch changes
In generation, solves position of failure point, and this method is only applicable to only two or three section of the simple joint line of structure, for power cable, frame
The multistage joint line that ceases to be busy is alternately present, fault analytical method criterion is more complex, and error can be with cable, aerial line connection point
Increase and increase, to reduce range accuracy.As cable and overhead line physical structure, in terms of existing for
Difference, traditional travelling wave ranging and failure analysis methods can not be all applicable in completely when being applied to mixed line fault ranging, and
Traveling wave rule is not influenced by transition resistance, fault type, is widely applied in recent years since ranging is simple.
According to the fault distance-finding method of overhead lines combined with cable, it is typically necessary and line fault parameter is known
Not with measurement, so that it is determined that the route of line failure, thus line fault parameter measurement it is accurate whether be directly related to
It breaks down the determination of route.Two sides are installed with the joint line of phasor measuring set, at present line fault parameter
Measurement method is required to artificially carry out the division control of route or additional zero sequence power supply, this not only consumes manpower and material resources but also meeting
Influence the stable operation of power grid.In the identification of route fault parameter, due to most of error in measurement Normal Distribution, make
It is usually used in fault parameter identification to handle the least square method (Least squares, LS) of such measurement, still, when measurement number
When occurring gross error in, actual value is often deviateed based on LS recognition result, so that joint line broke down
Route determines inaccurate.
Summary of the invention
The present invention provides a kind of transmission line one-phase earth fault parameter identification method, to solve to occur in metric data
When gross error, the larger problem of existing fault parameter recognition methods recognition result deviation.
The present invention passes through a kind of transmission line one-phase earth fault parameter identification method, and the recognition methods includes:
Set the initial weight P of each phasor measuring set measurement point in transmission line of electricityi (0)；
The initial value of the phasor measuring set measured value is calculated according to LS
According to the initial valueCalculate the residual error ν of the phasor measuring set measured value(0)；
According to the residual error ν(0)With the weighted value of equal value of phasor measuring set measurement point described in uncertainty calculation
According to the weighted value of equal valueIterate to calculate the new parameter end value of the phasor measuring set measured value
With new residual error ν(k), wherein
JudgementWhether ε, ε=0.01 are less than or equal to；
If describedLess than or equal to ε, then recognition result is exported
If describedGreater than ε, then the weighted value of equal value of the phasor measuring set measurement point is recalculatedUntil describedIt is less than and is equal to ε.
Preferably, the initial weight P for setting each phasor measuring set measurement point in transmission line of electricityi (0)Include: before
The residual voltage and electric current phasor of each phasor measuring set measurement point during acquisition singlephase earth fault；
Phasor β, line parameter circuit value phasor α to be identified and matrix A are formed by the residual voltage and the electric current phasor.
Preferably, the initial weight P for setting each phasor measuring set measurement point in transmission line of electricityi (0)Include:
Obtain the quantity N of the phasor measuring set measurement point；
The initial weight P of each phasor measuring set measurement point is set according to the quantity Ni (0)For 1/N.
Preferably, described according to the residual error ν(0)With the equivalence of phasor measuring set measurement point described in uncertainty calculation
Weighted valueInclude:
According to the residual error ν(0)Uncertain angle value ρ (ν is calculated with control coefrficient ci)；
Judge the uncertain angle value ρ (νi) whether it is greater than 0.5；
If the uncertain angle value ρ (νi) be greater than 0.5, then the phasor measuring set measured value is deleted；
If the uncertain angle value ρ (νi) be less than or equal to 0.5, then retain the phasor measuring set measured value；
Judge the residual error ν(0)The size of absolute value and the control coefrficient c；
If the residual error ν(0)Absolute value is less than or equal to the control coefrficient c, then weighted value of equal value
If the residual error ν(0)Absolute value is greater than the control coefrficient c, then weighted value of equal value
Preferably, the weighted value of equal value for recalculating the phasor measuring set measurement pointInclude:
Judge the residual error ν(k)The size of absolute value and the control coefrficient c；
If the residual error ν(k)Absolute value is less than or equal to the control coefrficient c, then weighted value of equal value
If the residual error ν(k)Absolute value is greater than the control coefrficient c, then weighted value of equal value
Preferably, the value range of the control coefrficient c is 1.0-2.0.
Preferably, the value of the control coefrficient c is 1.7.
The technical solution that the embodiment of the present invention provides can include the following benefits:
The present invention provides a kind of transmission line one-phase earth fault parameter identification method, which includes: that setting is defeated
The initial weight P of each phasor measuring set measurement point in electric linei (0)；The phasor measuring set measured value is calculated according to LS
Initial valueAccording to the initial valueCalculate the residual error ν of the phasor measuring set measured value(0)；According to the residual error ν(0)With
Control coefrficient c calculates the weighted value of equal value of the phasor measuring set measurement pointAccording to the weighted value of equal valueIteration
Calculate the new parameter value of the phasor measuring set measured valueWith new residual error ν(k), whereinJudgementWhether ε, ε=0.01 are less than or equal to；
If describedLess than or equal to ε, then recognition result is exportedIf describedGreater than ε, then count again
Calculate the weighted value of equal value of the phasor measuring set measurement pointUntil describedIt is less than and is equal to ε.In this hair
In the transmission line one-phase earth fault parameter identification method of bright offer, when singlephase earth fault occurs, setting is defeated in mixing
The phasor measuring set of electric line two sides measures track data, is improved by using estimation of uncertainty to LS
To new estimation of uncertainty, new estimation of uncertainty can be eliminated to be influenced brought by error in measurement even gross error,
And then increase the reliability and accuracy of parameter recognition result.Transmission line one-phase earth fault parameter identification provided by the invention
Method can accurately position the route to break down, thus have a good application prospect.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
It can the limitation present invention.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without any creative labor, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the method flow diagram of transmission line one-phase earth fault parameter identification method provided in an embodiment of the present invention；
Fig. 2 is π type equivalent circuit diagram provided in an embodiment of the present invention；
Fig. 3 is the voltage magnitude figure of b, c two-phase in actual measurement online data test provided in an embodiment of the present invention.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistented with the present invention.On the contrary, they be only with it is such as appended
The example of device and method being described in detail in claims, some aspects of the invention are consistent.
Attached drawing 1 is please referred to, attached drawing 1 shows transmission line one-phase earth fault parameter identification provided in an embodiment of the present invention
The method flow diagram of method, the description of following fault parameter recognition methods is based on attached drawing 1.
Transmission line one-phase earth fault parameter identification method provided in an embodiment of the present invention includes:
S01: the initial weight P of each phasor measuring set measurement point in setting transmission line of electricityi (0)；
S02: the initial value of the phasor measuring set measured value is calculated according to LS
S03: according to the initial valueCalculate the residual error ν of the phasor measuring set measured value(0)；
S04: according to the residual error ν(0), phasor measuring set measurement point described in control coefrficient c and uncertainty calculation etc.
Valence weighted value
S05: according to the weighted value of equal valueIterate to calculate the new parameter value of the phasor measuring set measured value
With new residual error ν(k), wherein
S06: judgementWhether ε, ε=0.01 are less than or equal to；
S07: if describedLess than or equal to ε, then recognition result is exported
S08: if describedGreater than ε, then the weight of equal value of the phasor measuring set measurement point is recalculated
ValueStep S04 is repeated, until describedIt is less than and is equal to ε.
Specific method are as follows:
S01: the initial weight P of each phasor measuring set measurement point in setting transmission line of electricityi (0)；
The route that phasor measuring set has been installed for overhead lines combined with cable bilateral, when generation single-phase earthing
When failure, to three-phase voltage, the electric current phasor before reclosing after the record single-phase tripping of breaker of each phasor measuring set, in turn
Corresponding residual voltage, electric current phasor can be obtained by calculating.π type equivalent circuit diagram shown in 2 with reference to the accompanying drawings, can be by zero
Sequence voltage, electric current phasor are classified as the equation of line, the equation of line are as follows:
Wherein,Respectively indicate route m end zero sequence voltage component and zero
Sequence current component；Respectively indicate route n end zero sequence voltage component and zero-sequence current component；Z0=R0+jX0Indicate zero sequence
Impedance, Y0=jB0Indicate zero sequence susceptance over the ground.
It is in turn two real part equations and two imaginary part equations by equation of line abbreviation, by real part equation and imaginary part equation group
At matrix are as follows:
Wherein, Im0R, Im0I, In0R, In0IRepresent m
The real part and imaginary part at end and the end n zero-sequence current phasor；Um0, θm0, Un0, θn0Represent the end m and the end n residual voltage phasor amplitude and
Phase angle；g0、b0Indicate 1/Z0Real and imaginary parts；yC0Indicate Y0/ 2 imaginary part.
The constant term of the zero-sequence current phasor real part and imaginary part composition in matrix is replaced by phasor β, matrix A replaces matrix
Middle route m, the coefficient matrix of the both ends n residual voltage phasor real part and imaginary part composition, α=[g0 b0 yC0]TInstead of line to be identified
Road parameter phasor, and the measurement residuals phasor v formed by phasor measuring set error in measurement is added, form the identification side of parameter
Journey, the parameter identify equation are as follows: β=A α+ν；
Parameter identification objective function can be obtained by LS and parameter identification equation, which identifies objective function are as follows:
Wherein, N is data points, i.e., the phasor measuring set in mixed power transmission line is surveyed
Measure the quantity of point；viFor the residual error phasor of i-th of data point；PiFor the weight of i-th of data point, then target letter is identified with parameter
The corresponding parameter recognition result of number are as follows:Wherein, it is P that P, which is diagonal element,iWeight matrix.
The initial weight P of each phasor measuring set measurement point is set according to data points Ni (0)For 1/N, i.e. i-th of data
The initial weight of point is 1/N.
S02: the initial value of phasor measuring set measured value is calculated according to LSThe initial value
S03: according to initial valueAnd parameter identification equation β=A α+ν calculates the residual error ν of phasor measuring set measured value(0)；
S04: according to residual error ν(0), control coefrficient c and uncertainty calculation phasor measuring set measurement point weighted value of equal value
Parameter is replaced to identify the sum of squares function in objective function using slower function ρ is increased, according to residual error ν(0)And control
Coefficient c processed calculates uncertain angle value ρ (νi), wherein uncertain angle value ρ (νi) calculation formula are as follows:
Wherein, the value range of control coefrficient c is generally 1.0-2.0, at this
It is other accuracy for optimization uncertainty and raising parameter, the value of control coefrficient c is preferably 1.7 in inventive embodiments；
Judge uncertain angle value ρ (ν calculatedi) whether it is greater than 0.5；
If uncertain angle value ρ (νi) be greater than 0.5, then measured value measured by phasor measuring set measurement point is deleted；
If uncertain angle value ρ (νi) be less than or equal to 0.5, then retain measurement measured by phasor measuring set measurement point
Value；
By not knowing angle value ρ (νi) determine that its Modified Equivalent Weight Function isThe Modified Equivalent Weight FunctionCalculation formula are as follows:
Judge residual error ν(0)The size of absolute value and the control coefrficient c；
If residual error ν(0)Absolute value is less than or equal to control coefrficient c, then retains initial weight value, i.e., initial weight value etc.
Valence weighted value is
If residual error ν (0) absolute value is greater than control coefrficient c, then drop power carried out to initial weight value, i.e., initial weight value etc.
Valence weighted value is
S05: according to the weighted value of equal value of initial weight valueIterate to calculate the new parameter knot of phasor measuring set measured value
Fruit valueWith new residual error ν(k), wherein
Increase slower function ρ instead of the sum of squares function in parameter identification objective function, i.e. parameter due to having used
Identification objective function has occurred and that change, then parameter recognition result corresponding with the parameter identification objective function after change are as follows:Residual computations function isParameter recognition result is based on uncertainty
The least-squares iteration function of estimation.
S06: judgementWhether ε, ε=0.01 are less than or equal to；
S07: ifLess than or equal to ε, then recognition result is exported
S08: ifGreater than ε, then repeatedly step S04-S06, untilIt is less than and is equal to ε, thus
Output parameter recognition result
Transmission line one-phase earth fault parameter identification method provided in an embodiment of the present invention passes through to different metric data
Different weights is assigned, and least square (RLS) iteration function based on estimation of uncertainty can be biggish by uncertainty
Numerical value removal, while drop power can also be carried out to bad data, to eliminate the influence of bad data, improve the standard of recognition result
True property and reliability.
To verify transmission line one-phase earth fault parameter identification method identification of defective parameter provided in an embodiment of the present invention
Accuracy and reliability with higher, the embodiment of the present invention is also from BPA (Bonneville Power Administration)
Emulation data test and two aspect of actual measurement online data verify it, the particular content of verifying are as follows:
1, BPA emulates data test
Build a wire length 200km in BPA power system simulation software, it is defeated that voltage class is that single time of 220kV is maked somebody a mere figurehead
Electric line, zero sequence resistance R0=27.8456 Ω, zero-sequence reactance X0=99.8648 Ω, zero sequence susceptance B over the ground0=2.1876 × 10- 4S.Assuming that single-pole reclosing after singlephase earth fault occurs for the route, acquires and complete this time to reclosing after single-phase tripping
The route both ends Phasor Measurements data of 0.5s in section, wherein sampling period 0.01s, while line is carried out with RLS method and LS method
The identification of road parameter, experimental enviroment are that random noise is added, and record the parameter recognition result of bad data.
The test of 1.1 noise resisting abilities
1. being superimposed Gaussian noise in three-phase voltage amplitude is measured and measured with the amplitude of three-phase current simultaneously, noiseless is recorded
With the parameter recognition result of two kinds of algorithms when having noise, which please refers to table 1.
The recognition result of table 1:RLS method and LS method in the case where having noise and noise free conditions
It can be learnt from table 1, when noise is not present in measurement, RLS method is protected all data and is weighed, and it is identical as LS method,
The kernel estimators latter two method eligible results such as RLS method carries out are consistent with design value；There is standard deviation in the measurement is 0.5%
Random noise in the case where, residual error slightly larger data in part are carried out drop power by RLS method, and recognition result obtained is better than LS
Method.
2. three-phase voltage amplitude measure be superimposed with the measurement of the amplitude of three-phase current standard deviation be respectively 0.5%, 1% and
2% random noise, the parameter recognition result of two kinds of algorithms, the recognition result please refer to table 2 when recording different noises.
The recognition result of table 2:RLS method and LS method under different noise conditions
It can be learnt from table 2, there are the data volumes of big residual error to increase with the increase of random noise standard deviation, causes
Increased using the recognition result error that LS method obtains；And RLS method can effectively eliminate the influence of big residual error data, each
Under noise intensity, high-precision recognition result can be obtained.
It can show that by the above results, when the noise in metric data is larger, the recognition result of LS method will deviate from reality
Value, and RLS method still keeps higher accuracy of identification, therefore, transmission line one-phase earth fault ginseng provided in an embodiment of the present invention
Number recognition methods has preferable noise resisting ability.
1.2 anti-rough error aptitude tests
In this trial, three kinds of situations containing bad data are designed, compare RLS method and LS respectively according to three kinds of situations
The anti-rough error ability of method, and recording parameters recognition result, the parameter recognition result please refer to table 3 respectively.Three kinds of situations of design
Being respectively as follows: the side situation 1-, continuously there are 10% deviations for several a phase current magnitude data；The continuous several a phases in the side situation 2-
There are 1 ° of deviations for current phase angle data；There is packet loss in upload procedure in situation 3- data, side continuously several three-phase voltages,
Current data is 0.
The recognition result of the anti-rough error ability of table 3:RLS method and LS method
Can be learnt from table 3, no matter measure in there are the bad data of which kind of situation, RLS method can be eliminated slightly
The influence of difference, obtains accurate recognition result；And LS method is in some cases, the recognition result of each parameter is even tight
Deviate true value again.
The above results show that under three kinds of situations, RLS can provide relatively accurate recognition result, have very strong support
Drive undesirable ability, and LS recognition result obtained has different degrees of deviation with actual value, do not have resist it is undesirable
Ability.Therefore, the influence of various bad datas can be more effectively resisted using the least square method based on estimation of uncertainty,
Engineering application value is higher.
2, actual measurement online data test
In actual measurement online data test, used data are the mono- back transmission line of power grid 220kV, wherein parameter
Off-line measurement value: zero sequence resistance R0=12.56 Ω, zero-sequence reactance X0=27.88 Ω, zero sequence susceptance B over the ground0=7.86544 ×
10-5S.In actual measurement online data test, the phasor before being completed after singlephase earth fault to breaker reclosing occurs for record a phase
Measuring device bilateral phasor measuring set open-phase operation steady state data, and LS method and RLS method progress line parameter circuit value is respectively adopted
Identification, the parameter recognition result are reported in Table 4 below, while the voltage magnitude of b, c two-phase is recorded in attached drawing 3, wherein the sampling period
For 10ms, selected data length is 500ms.
Table 4:RLS method and LS method are to the parameter recognition result for surveying online data
It can be learnt from table 4 and attached drawing 3, relative to LS method, the identification error of RLS method is lower, therefore the present invention is implemented
The transmission line one-phase earth fault parameter identification method that example provides equally has accurate identity to online data, and identifies
Precision is higher.
The recognition result for emulating data test by above-mentioned BPA and surveying online data test shows the embodiment of the present invention
The transmission line one-phase earth fault parameter identification method of offer improves to obtain new by using estimation of uncertainty to LS
Estimation of uncertainty, form the least square method of estimation of uncertainty, the least square method of the estimation of uncertainty can disappear
Except influence brought by error in measurement even gross error, and then increase the reliability and accuracy of parameter recognition result.This hair
The transmission line one-phase earth fault parameter identification method of bright offer can accurately position the route to break down, thus
It has a good application prospect.
Those skilled in the art will readily occur to of the invention its after considering specification and the disclosure invented here of practice
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows general principle of the invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the present invention is not limited to the precise structure already described above and shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (7)
1. a kind of transmission line one-phase earth fault parameter identification method, which is characterized in that the recognition methods includes:
Set the initial weight P of each phasor measuring set measurement point in transmission line of electricityi (0)；
The initial value of the phasor measuring set measured value is calculated according to least square method
According to the initial valueCalculate the residual error ν of the phasor measuring set measured value(0)；
According to the residual error ν(0)With the weighted value of equal value of phasor measuring set measurement point described in uncertainty calculation
According to the weighted value of equal valueIterate to calculate the new parameter end value of the phasor measuring set measured valueWith it is new
Residual error ν(k), wherein
JudgementWhether ε, ε=0.01 are less than or equal to；
If describedLess than or equal to ε, then recognition result is exported
If describedGreater than ε, then the weighted value of equal value of the phasor measuring set measurement point is recalculatedDirectly
To describedIt is less than and is equal to ε.
2. transmission line one-phase earth fault parameter identification method according to claim 1, which is characterized in that the setting
The initial weight P of each phasor measuring set measurement point in transmission line of electricityi (0)Include: before
The residual voltage and electric current phasor of each phasor measuring set measurement point during acquisition singlephase earth fault；
Phasor β, line parameter circuit value phasor α to be identified and matrix A are formed by the residual voltage and the electric current phasor.
3. transmission line one-phase earth fault parameter identification method according to claim 1, which is characterized in that the setting
The initial weight P of each phasor measuring set measurement point in transmission line of electricityi (0)Include:
Obtain the quantity N of the phasor measuring set measurement point；
The initial weight P of each phasor measuring set measurement point is set according to the quantity Ni (0)For 1/N.
4. transmission line one-phase earth fault parameter identification method according to claim 1, which is characterized in that the basis
The residual error ν(0)With the weighted value of equal value of phasor measuring set measurement point described in uncertainty calculationInclude:
According to the residual error ν(0)Uncertain angle value ρ (ν is calculated with control coefrficient ci)；
Judge the uncertain angle value ρ (νi) whether it is greater than 0.5；
If the uncertain angle value ρ (νi) be greater than 0.5, then the phasor measuring set measured value is deleted；
If the uncertain angle value ρ (νi) be less than or equal to 0.5, then retain the phasor measuring set measured value；
Judge the residual error ν(0)The size of absolute value and the control coefrficient c；
If the residual error ν(0)Absolute value is less than or equal to the control coefrficient c, then weighted value of equal value
If the residual error ν(0)Absolute value is greater than the control coefrficient c, then weighted value of equal value
5. transmission line one-phase earth fault parameter identification method according to claim 1, which is characterized in that it is described again
Calculate the weighted value of equal value of the phasor measuring set measurement pointInclude:
Judge the residual error ν(k)The size of absolute value and control coefrficient c；
If the residual error ν(k)Absolute value is less than or equal to the control coefrficient c, then weighted value of equal value
If the residual error ν(k)Absolute value is greater than the control coefrficient c, then weighted value of equal value
6. transmission line one-phase earth fault parameter identification method according to claim 4 or 5, which is characterized in that described
The value range of control coefrficient c is 1.0-2.0.
7. transmission line one-phase earth fault parameter identification method according to claim 6, which is characterized in that the control
The value of coefficient c is 1.7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611040399.1A CN106526424B (en) | 2016-11-21 | 2016-11-21 | A kind of transmission line one-phase earth fault parameter identification method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611040399.1A CN106526424B (en) | 2016-11-21 | 2016-11-21 | A kind of transmission line one-phase earth fault parameter identification method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106526424A CN106526424A (en) | 2017-03-22 |
| CN106526424B true CN106526424B (en) | 2019-02-15 |
Family
ID=58356809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611040399.1A Active CN106526424B (en) | 2016-11-21 | 2016-11-21 | A kind of transmission line one-phase earth fault parameter identification method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106526424B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109254225A (en) * | 2018-08-13 | 2019-01-22 | 中国南方电网有限责任公司超高压输电公司南宁监控中心 | A kind of detection of electric network fault and faulty line recognition methods |
| CN117148044B (en) * | 2023-09-19 | 2024-04-02 | 山东华科信息技术有限公司 | Power distribution network fault positioning method and device based on artificial intelligence |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2532155B2 (en) * | 1990-05-31 | 1996-09-11 | 関西電力株式会社 | Fault location method for n-terminal parallel 2-circuit transmission line |
| CN102175922B (en) * | 2011-01-24 | 2013-04-24 | 重庆大学 | Phasor measurement unit (PMU) measurement data-based power line parameter identification and estimation method |
| CN102163844B (en) * | 2011-03-14 | 2013-05-01 | 国网技术学院 | Method for detecting state of power system based on phasor measurement unit (PMU) |
| CN104297635B (en) * | 2014-10-14 | 2017-10-31 | 河南理工大学 | Distribution network fault line selection method based on atom Its Sparse Decomposition and extreme learning machine |
| CN105588982A (en) * | 2014-10-27 | 2016-05-18 | 国家电网公司 | Measurement and calculation method of harmonic impedance of power system |
-
2016
- 2016-11-21 CN CN201611040399.1A patent/CN106526424B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106526424A (en) | 2017-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Trindade et al. | Fault location in distribution systems based on smart feeder meters | |
| Dāsa | Determining the locations of faults in distribution systems | |
| US8044666B2 (en) | Method for determining location of phase-to earth fault | |
| CN108051700B (en) | The phase component fault distance-finding method of distribution line parameter identification based on μ PMU | |
| US20160116522A1 (en) | Fully adaptive fault location method | |
| US20150073735A1 (en) | Method for adaptive fault location in power system networks | |
| CN103592575A (en) | Self-adaptation weighting data fusion fault distance measurement method based on multi-sensor system | |
| CN106054023B (en) | The method of two sides system impedance is estimated in a kind of transmission line of electricity single end distance measurement | |
| CN111141995B (en) | Line double-end steady-state distance measuring method and system based on amplitude comparison principle | |
| CN110333394B (en) | Low-voltage distribution network line impedance estimation method | |
| CN104820133A (en) | Online measurement method for impedance parameter of three-phase asymmetric power transmission line | |
| CN109523165A (en) | A kind of voltage dip situation estimation method based on limited information | |
| CN103543376A (en) | Radial basis function neutral network method used for fault line selection of small current grounding system | |
| CN106526424B (en) | A kind of transmission line one-phase earth fault parameter identification method | |
| CN111551824A (en) | Phase voltage amplitude and phase angle change rate ground fault phase selection method and device considering three-phase asymmetry | |
| CN106096161B (en) | The emulated computation method of power transmission line power frequency induced voltage and electric current | |
| CN108362978A (en) | A kind of T-type power transmission line fault locating method based on range function phase characteristic | |
| CN105203877B (en) | Single back transmission line Zero sequence parameter discrimination method of error in measurement influence can be eliminated | |
| CN107169881A (en) | Introduce the Measuring Set in Power System State method of estimation of PMU branch current phasors | |
| Mirshekali et al. | An accurate fault location algorithm for smart electrical distribution systems equipped with micro phasor mesaurement units | |
| CN109241626A (en) | A kind of calculation method of power transmission line power frequency order parameter | |
| Li et al. | Augmented state estimation method for fault location based on on-line parameter identification of PMU measurement data | |
| CN110456226A (en) | A kind of fault localization system of transmission line of electricity | |
| CN108089058A (en) | A kind of discrimination method of the positive order parameter of robust distribution network line | |
| CN109470988A (en) | A kind of fault localization system and method suitable for T-type transmission line of electricity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |