CN108197822A - A kind of distribution network fault line selection adaptability teaching decision-making technique - Google Patents
A kind of distribution network fault line selection adaptability teaching decision-making technique Download PDFInfo
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Abstract
The invention discloses a kind of distribution network fault line selection adaptability teaching decision-making techniques, it establishes the various impact factors for distribution network fault line selection mode including step 1；Impact factor under different dimensions is gone dimension to handle by step 2, for different line selection modes, forms unified forward directionization evaluation index；The evaluation index of each line selection mode is made normalized by step 3, and index maximum value forms ideal sample, and index minimum value forms negative ideal sample；Step 4 makes evaluation decision according to the sequence of route selection index；When solving for distribution network fault line selection, the factors such as distribution net work structure, outlet type, load condition will generate different selection methods different degrees of influence；Due to lacking the research to the overall merit of selection method at present, the concrete structure that can not be directed to power distribution network select optimal line selection mode, can not ensure accurately to select faulty line so that the safe and reliable operation of power distribution network such as is on the hazard at the technical problems.
Description
Technical field
The invention belongs to Power System Analysis technical fields more particularly to a kind of distribution network fault line selection adaptability teaching to determine
Plan method.
Background technology
With the further development of domestic distribution system, distribution network structure is increasingly sophisticated, which is characterized in that power distribution network
10kV busbar outlets gradually increase, and the distribution of failure zero-sequence current is increasingly sophisticated, and failure mode is various.When breaking down can it is quick,
The selection method for accurately selecting faulty line is the important leverage of power distribution network safe and reliable operation.
At present, the common selection method of power distribution network includes：Zero-sequence current amplitude com parison method, zero-sequence current active component method,
Signal injection method, wavelet analysis method, first half-wave method etc..Theoretically, each selection method can accurately select faulty line more than,
But in actual operation, the effect of each selection method receives the influence of different factors.Based on fault-signal steady-state component
Selection method, such as zero-sequence current than width method, zero sequence power method, zero-sequence current active component method selection method by line length,
The factors such as out-of-balance current, the inductive current for flowing through ground connection arc suppression coil are affected；Based on fault component one of transient characteristic quantity into
The method of row route selection, such as first half-wave method, wavelet analysis method, are occurred moment, transition resistance, power electronic equipment etc. by failure
Factor is affected；The failure line selection based on information fusion technology based on neural network, fuzzy theory and rough set theory etc..Side
Method is complicated, realizes that difficulty is big, how actual effect, which waits, is verified.Clearly for practical small current neutral grounding system, power distribution network
The factors such as structure, outlet type, load condition will generate different selection methods different degrees of influence.Due to lacking at present
Research to the overall merit of selection method, the concrete structure that can not be directed to power distribution network are selected optimal line selection mode, can not be ensured
Accurately select faulty line so that the safe and reliable operation of power distribution network is on the hazard.
Invention content：
The technical problem to be solved in the present invention：A kind of distribution network fault line selection adaptability teaching decision-making technique is provided, with solution
When certainly the prior art is directed to distribution network fault line selection, for practical small current neutral grounding system, distribution net work structure, outlet class
The factors such as type, load condition will generate different selection methods different degrees of influence；Due to lacking at present to selection method
Overall merit research, can not be directed to power distribution network concrete structure select optimal line selection mode, can not ensure accurately to select therefore
Hinder circuit so that the safe and reliable operation of power distribution network such as is on the hazard at the technical problems.
Technical solution of the present invention：
A kind of distribution network fault line selection adaptability teaching decision-making technique, it includes：
Step 1 establishes the various impact factors for distribution network fault line selection mode；
Impact factor under different dimensions is gone dimension to handle by step 2, for different line selection modes, forms unification
Forward directionization evaluation index；
Step 3：The evaluation index of each line selection mode is made into normalized, index maximum value forms ideal sample, refers to
It marks minimum value and forms negative ideal sample；
Step 4 makes evaluation decision according to the sequence of route selection index.
Impact factor described in step 1 includes：Zero-sequence current is than the impact factor of width method, zero-sequence current active component method
The impact factor of impact factor, the impact factor of signal injection method and wavelet analysis method；
Zero-sequence current includes than the impact factor of width method：
a11=σ2, in formula：a11It is zero-sequence current than first impact factor of width method, σ2Go out the variance of line length for feeder line；
a12=ε, in formula：a12Be zero-sequence current than second impact factor of width method, ε is outlet cable rate；
a13=Rg, in formula：a13It is zero-sequence current than width method third impact factor, RgTo be grounded transition resistance during failure；
In formula：a14It is zero-sequence current than the 4th impact factor of width method, IdcFor current transformer direct current point
Amount, S are current transformer capacity；
The impact factor of zero-sequence current active component method includes：
In formula：a21For first impact factor of zero-sequence current active component method, r0For feeder line unit length zero sequence
Resistance, x0For feeder line unit length zero-sequence reactance；
In formula：a22For second impact factor of zero-sequence current active component method, RLFor in ground connection arc suppression coil
Resistance content, ω are power frequency angular velocity of rotation, and L is ground connection arc suppression coil inductance；
The impact factor of signal injection method includes：
a31=f, in formula：a31For first impact factor of signal injection method, f is Injection Signal frequency；
a32=S, in formula：a32For second impact factor of signal injection method, S is current transformer capacity；
a33=Rg, in formula：a33Signal injection method third impact factor, RgTo be grounded transition resistance during failure；
The impact factor of wavelet analysis method includes：
a41=Kφ, in formula：a41For first impact factor of wavelet analysis method, KφFor voltage higher harmonic content.
Dimension is gone to handle the impact factor under different dimensions, for different line selection modes, form unified forward directionization
The method of evaluation index includes：
Step 2.1, calculating zero-sequence current include than the method for width method evaluation index：
Dimension is gone to obtain impact factor：
Impact factor forward direction is obtained：
Then zero-sequence current is expressed as than the evaluation index of width method：
μ1=a "11a″12a″13a″14；
Step 2.2 calculates zero-sequence current active component method evaluation index method including dimension being gone to obtain impact factor：
Impact factor forward direction：
a″21=a '21
a″22=a '22
Then the evaluation index of zero-sequence current active component method is expressed as：
μ2=a "21a″22；
Step 2.3, calculating signal injection method evaluation index method include：
Dimension is gone to obtain impact factor：
Impact factor forward direction：
a″31=a '31
a″32=a '32
Then the evaluation index of zero-sequence current active component method is expressed as：
μ3=a "31a″32a″33；
Step 2.4, calculating wavelet analysis method evaluation index method include：
Wavelet analysis method impact factor only has one kind, and negatively correlated with route selection accuracy, then directly will be after its forward directionization
Wavelet analysis method evaluation index is expressed as, then the evaluation index of wavelet analysis method is expressed as：
In formula：a11It is zero-sequence current than first impact factor of width method；a12For zero-sequence current than width method second influence because
Son；a13It is zero-sequence current than width method third impact factor, a14It is zero-sequence current than the 4th impact factor of width method；a1'1To go
Zero-sequence current is than first impact factor of width method after dimension；a1'2It is that zero-sequence current influences for second than width method after going dimension
The factor；a1'3It is zero-sequence current after going dimension than width method third impact factor；a1'4Compare width for zero-sequence current after going dimension
The 4th impact factor of method；a″11It is zero-sequence current after forward directionization than first impact factor of width method；a″12For zero sequence after forward directionization
Electric current is than second impact factor of width method；a″13It is zero-sequence current after forward directionization than width method third impact factor；a″14For forward direction
Zero-sequence current is than the 4th impact factor of width method after change；a21For first impact factor of zero-sequence current active component method；a22It is zero
Second impact factor of sequence active component of current method；a'21For go after dimension zero-sequence current active component method first influence because
Son；a'22To remove second impact factor of zero-sequence current active component method after dimension；a″21It is active for zero-sequence current after forward directionization
First impact factor of component method；a″22For second impact factor of zero-sequence current active component method after forward directionization；a31For signal
First impact factor of injection method；a32For second impact factor of signal injection method；a33For signal injection method third influence because
Son；a'31To remove first impact factor of signal injection method after dimension；a'32To remove second shadow of signal injection method after dimension
Ring the factor；a'33To remove signal injection method third impact factor after dimension；a″31For signal injection method after forward directionization first
Impact factor；a″32For second impact factor of signal injection method after forward directionization；a″33For signal injection method third after forward directionization
Impact factor；a41For first impact factor of wavelet analysis method；μ1It is zero-sequence current than width method route selection evaluation index；μ2For zero sequence
Active component of current method route selection evaluation index；μ3For signal injection method route selection evaluation index；μ4Refer to for wavelet analysis method route selection evaluation
Mark；μmaxRepresent μ1,μ2,μ3,μ4In maximum value；μminRepresent μ1,μ2,μ3,μ4In minimum value.
The evaluation index of each line selection mode is made into normalized described in step 3, index maximum value forms ideal sample,
The method that index minimum value forms negative ideal sample includes：
Route selection evaluation index is normalized according to following formula for step 3.1
Step 3.2, index maximum value form ideal sample
Index minimum value forms negative ideal sample
In formula：It is zero-sequence current after normalization than width method route selection evaluation index；It is active for zero-sequence current after normalization
Component method route selection evaluation index；For signal injection method route selection evaluation index after normalization；For wavelet analysis method after normalization
Route selection evaluation index.
Beneficial effects of the present invention：
The present invention is for four kinds of common selection methods, including zero-sequence current than width method, zero-sequence current active component method, signal
Injection method, wavelet analysis method carry out quantitative analysis for its respective influence factor respectively, give the influence of line selection mode because
Son by going dimension, forward directionization processing, forms the evaluation index of each line selection mode.By normalized, will evaluate
Index is ranked up by order of magnitude, and sequence evaluation is made to the quality of selection method, is obtained under this evaluation decision method
Optimal line selection mode.
The present invention carries out quantitative analysis according to different line selection modes to the adaptability of power distribution network, has obtained each route selection side
The impact factor of formula obtains the evaluation index of different line selection modes by normalizing the means such as forward directionization, to the excellent of selection method
Bad to make sequence evaluation, the decision for line selection mode in specific power distribution network provides scheme.
The present invention compensates for the shortcoming of current power distribution network route selection Adaptability Analysis and decision-making technique；The present invention considers zero sequence
Electric current than width method, zero-sequence current active component method, signal injection method, wavelet analysis method specific influence factor, with reference to power distribution network
Structural parameters give and can evaluate evaluation index of each selection method to rack adaptability, and index is passed through into normalizing
The processing means such as change, forward directionization are made the quality of selection method sequence evaluation, are obtained under this evaluation decision method most preferably
Line mode can be the decision of line selection mode to be selected to make reference in power distribution network；The prior art is solved for distribution network failure
It, will be to difference for factors such as practical small current neutral grounding system, distribution net work structure, outlet type, load conditions during route selection
Selection method generate different degrees of influence；Due to lacking the research to the overall merit of selection method at present, can not be directed to
The concrete structure of power distribution network selects optimal line selection mode, can not ensure accurately to select faulty line so that the safety of power distribution network can
It the technical problems such as is on the hazard by operation.
Specific embodiment：
A kind of distribution network fault line selection adaptability teaching decision-making technique first according to the influence factor of line selection mode, is formed
Line selection mode impact factor, the positive negative correlation of the analyzing influence factor and route selection accuracy.By the impact factor under different dimensions
Element goes dimension to handle, for different line selection modes, including zero-sequence current than width method, zero-sequence current active component method, small wavelength-division
Analysis method and injecting signal form unified forward directionization evaluation index.The evaluation index of each line selection mode is normalized again
Processing, index maximum value form ideal sample, and index minimum value forms negative ideal sample, made and commented according to the sequence of route selection index
Estimate decision.Wherein line selection mode impact factor and evaluation index is obtained by following method：
(1) zero-sequence current is than width method impact factor：
When feed line length gap is larger, if compared with there is certain to be mutually grounded on short-term road, the zero-sequence current and non-faulting of the circuit
The zero-sequence current gap of long transmission line is little, and route selection success rate is relatively low, therefore using the variance of each feed line length as zero-sequence current ratio
One of impact factor of width method, is expressed as：
a11=σ2 (1)
The impact factor and route selection accuracy are negatively correlated；
When outlet cable rate is higher, capacitance current effect is more apparent during failure, and faulty line zero-sequence current is compared non-
Faulty line becomes apparent from, and route selection accuracy rate is higher.Therefore using the cable rate of feeder line as zero-sequence current than width method influence because
One of son is expressed as：
a12=ε (2)
The impact factor is proportionate with route selection accuracy；
When trouble point is through high resistance ground, neutral point voltage offset very little, zero-sequence current is smaller, and route selection success rate is relatively low.
Therefore it is expressed as using transition resistance during failure as zero-sequence current than one of impact factor of width method：
a13=Rg (3)
The impact factor and route selection accuracy are negatively correlated.
CT saturation causes out-of-balance current, it will changes each circuit zero sequence current measurement value, route selection is caused to miss
Sentence.Therefore it is expressed as using CT saturation degree as zero-sequence current than one of impact factor of width method：
The impact factor and route selection accuracy are negatively correlated.
(2) zero-sequence current active component method
Since line-to-ground is there are conductance, while arc suppression coil is there is also certain resistance, therefore using zero-sequence current
Active component carries out route selection.
Using the ratio between feeder line unit length zero sequence resistance and zero-sequence reactance as one of impact factor of zero sequence active component method,
It is expressed as：
Its value is bigger to represent that zero-sequence current active component content is bigger.The impact factor is proportionate with route selection accuracy.
Using the resistive component in arc suppression coil as one of impact factor of zero sequence active component method, it is expressed as：
Its value is bigger to represent that arc suppression coil is bigger to the effect for increasing zero-sequence current active component.The impact factor and route selection
Accuracy is proportionate.
(3) signal injection method
System occur earth fault after, can in systems property point inject a specific frequency signal.The signal will be through connecing
System neutral is flowed back in place along faulty line, whether contains spy's frequency signal in the electric current by detecting each circuit, you can
Select faulty line.
Injection Signal frequency is higher, and arc suppression coil is bigger to the impedance of high-frequency signal, it will be able to eliminate arc suppression coil compensation
Influence to failure line selection, therefore using Injection Signal frequency as one of impact factor of the selection method, be expressed as：
a31=f (7)
The impact factor is proportionate with route selection accuracy.
When current transformer capacity is bigger, the signal strength that can be injected is stronger, therefore the capacity of current transformer is made
One of impact factor for the selection method, is expressed as：
a32=S (8)
The impact factor is proportionate with route selection accuracy.
When trouble point is through high resistance ground, the zero sequence impedance increase of faulty line, Injection Signal may be sewed to non-faulting
Route selection is caused to fail in circuit.Therefore it using transition resistance as one of impact factor of the selection method, is expressed as：
a33=Rg (9)
The impact factor and route selection accuracy are negatively correlated.
(4) wavelet analysis method
Fault-signal in this method elder generation acquisition system, then further according to Theory of Singularity Detection Based on Wavelet Transformation to collecting
Signal carries out wavelet transformation, acquires modulus maximum point, in the hope of the size of each circuit zero sequence current-mode maximum be with direction
Criterion determines faulty line.
When the higher harmonic content in power distribution network is higher, the accuracy of wavelet transformation is influenced bigger.Therefore contained with harmonic wave
One of impact factor as the selection method is measured, is expressed as：
a41=Kφ (10)
The impact factor and route selection accuracy are negatively correlated.
Each parameter is meant that in above-mentioned formula：
σ2：Feeder line goes out the variance of line length；
ε：Outlet cable rate；
Rg：Transition resistance is grounded during failure；
Idc：Current transformer DC component；
S：Current transformer capacity；
r0：Feeder line unit length zero sequence resistance；
x0：Feeder line unit length zero-sequence reactance；
RL：It is grounded resistance content in arc suppression coil；
ω：Power frequency angular velocity of rotation；
L：It is grounded arc suppression coil inductance；
f：Injection Signal frequency；
Kφ：Voltage higher harmonic content；
aij：Route selection impact factor；
1st, the specific structure of input power distribution network and operating parameter
The operating parameter of power distribution network includes：Each feed line length, outlet cable rate, current transformer DC component, electric current
Mutual inductor capacity, Injection Signal frequency, feeder line unit length zero sequence resistance, feeder line unit length zero-sequence reactance, ground connection arc blowout wire
Resistance content, power frequency angular velocity of rotation, ground connection arc suppression coil inductance, Injection Signal frequency in circle.
2nd, distribution system abort situation is inputted：Abort situation can be network any position
3rd, distribution system fault parameter is inputted：Voltage higher harmonic content during including fault ground transition resistance, failure.
4th, according to the operating parameter of system and fault signature obtain zero-sequence current than width method, zero-sequence current active component method,
Each impact factor of injecting signal, wavelet analysis method.
5th, the impact factor of each line selection mode is gone into dimension, forward directionization processing, makees product and obtain each line selection mode evaluation
Index.
(1) zero-sequence current is calculated than width method evaluation index：
Go dimensionization that can obtain impact factor：
Impact factor forward directionization can obtain：
a″12=a '12 (16)
Then zero-sequence current than the evaluation index of width method be represented by for：
μ1=a "11a″12a″13a″14 (19)
(2) zero-sequence current active component method evaluation index calculates：
Go dimensionization that can obtain impact factor：
Impact factor forward directionization can obtain：
a″21=a '21 (22)
a″22=a '22 (23)
Then the evaluation index of zero-sequence current active component method be represented by for：
μ2=a "21a″22 (24)
(3) signal injection method evaluation index calculates：
Go dimensionization that can obtain impact factor：
Impact factor forward directionization can obtain：
a″31=a '31 (28)
a″32=a '32 (29)
Then the evaluation index of zero-sequence current active component method is represented by：
μ3=a "31a″32a″33 (31)
(4) wavelet analysis method evaluation index calculates：
It, then can be directly by it just since wavelet analysis method impact factor only has one kind, and negatively correlated with route selection accuracy
Wavelet analysis method evaluation index is expressed as after change.Then the evaluation index of wavelet analysis method is represented by：
6th, each selection method evaluation index is normalized, and is ranked up by its order of magnitude, index is most
Big value forms ideal sample, and index minimum value forms negative ideal sample, obtains to power distribution network line selection mode evaluation decision.
Route selection evaluation index has been normalized first：
Then the optimal selection method under this evaluation decision method isCorresponding route selection side
Formula, most bad line selection mode areCorresponding line selection mode.
Each parameter is meant that in above-mentioned formula：
σ2：Feeder line goes out the variance of line length；
ε：Outlet cable rate；
Rg：Transition resistance is grounded during failure；
Idc：Current transformer DC component；
S：Current transformer capacity；
r0：Feeder line unit length zero sequence resistance；
x0：Feeder line unit length zero-sequence reactance；
RL：It is grounded resistance content in arc suppression coil；
ω：Power frequency angular velocity of rotation；
L：It is grounded arc suppression coil inductance；
f：Injection Signal frequency；
Kφ：Voltage higher harmonic content；
a11：Zero-sequence current is than first impact factor of width method；
a12：Zero-sequence current is than second impact factor of width method；
a13：Zero-sequence current is than width method third impact factor；
a14：Zero-sequence current is than the 4th impact factor of width method；
a′11：Zero-sequence current is than first impact factor of width method after going dimension；
a′12：Zero-sequence current is than second impact factor of width method after going dimension；
a′13：Zero-sequence current is than width method third impact factor after going dimension；
a′14：Zero-sequence current is than the 4th impact factor of width method after going dimension；
a″11：Zero-sequence current is than first impact factor of width method after forward directionization；
a″12：Zero-sequence current is than second impact factor of width method after forward directionization；
a″13：Zero-sequence current is than width method third impact factor after forward directionization；
a″14：Zero-sequence current is than the 4th impact factor of width method after forward directionization；
a21：First impact factor of zero-sequence current active component method；
a22：Second impact factor of zero-sequence current active component method；
a'21：Remove first impact factor of zero-sequence current active component method after dimension；
a'22：Remove second impact factor of zero-sequence current active component method after dimension；
a″21：First impact factor of zero-sequence current active component method after forward directionization；
a″22：Second impact factor of zero-sequence current active component method after forward directionization；
a31：First impact factor of signal injection method；
a32：Second impact factor of signal injection method；
a33：Signal injection method third impact factor；
a'31：Remove first impact factor of signal injection method after dimension；
a'32：Remove second impact factor of signal injection method after dimension；
a'33：Remove signal injection method third impact factor after dimension；
a”31：First impact factor of signal injection method after forward directionization；
a″32：Second impact factor of signal injection method after forward directionization；
a″33：Signal injection method third impact factor after forward directionization；
a41：First impact factor of wavelet analysis method；
μ1：Zero-sequence current is than width method route selection evaluation index；
μ2：Zero-sequence current active component method route selection evaluation index；
μ3：Signal injection method route selection evaluation index；
μ4：Wavelet analysis method route selection evaluation index；
μmax：μ1,μ2,μ3,μ4In maximum value；
μmin：μ1,μ2,μ3,μ4In minimum value；
Zero-sequence current is than width method route selection evaluation index after normalization；
Zero-sequence current active component method route selection evaluation index after normalization；
Signal injection method route selection evaluation index after normalization；
Wavelet analysis method route selection evaluation index after normalization.
Claims (4)
1. a kind of distribution network fault line selection adaptability teaching decision-making technique, it includes：
Step 1 establishes the various impact factors for distribution network fault line selection mode；
Impact factor under different dimensions is gone dimension to handle by step 2, for different line selection modes, forms unified forward direction
Change evaluation index；
Step 3：The evaluation index of each line selection mode is made into normalized, index maximum value forms ideal sample, and index is most
Small value forms negative ideal sample；
Step 4 makes evaluation decision according to the sequence of route selection index.
2. a kind of distribution network fault line selection adaptability teaching decision-making technique according to claim 1, it is characterised in that：Step
Impact factor described in 1 includes：Zero-sequence current is than the impact factor of width method, the impact factor of zero-sequence current active component method, letter
Number impact factor of injection method and the impact factor of wavelet analysis method；
Zero-sequence current includes than the impact factor of width method：
a11=σ2, in formula：a11It is zero-sequence current than first impact factor of width method, σ2Go out the variance of line length for feeder line；
a12=ε, in formula：a12Be zero-sequence current than second impact factor of width method, ε is outlet cable rate；
a13=Rg, in formula：a13It is zero-sequence current than width method third impact factor, RgTo be grounded transition resistance during failure；
In formula：a14It is zero-sequence current than the 4th impact factor of width method, IdcFor current transformer DC component, S is
Current transformer capacity；
The impact factor of zero-sequence current active component method includes：
In formula：a21For first impact factor of zero-sequence current active component method, r0For feeder line unit length zero sequence electricity
Resistance, x0For feeder line unit length zero-sequence reactance；
In formula：a22For second impact factor of zero-sequence current active component method, RLFor resistance in ground connection arc suppression coil
Content, ω are power frequency angular velocity of rotation, and L is ground connection arc suppression coil inductance；
The impact factor of signal injection method includes：
a31=f, in formula：a31For first impact factor of signal injection method, f is Injection Signal frequency；
a32=S, in formula：a32For second impact factor of signal injection method, S is current transformer capacity；
a33=Rg, in formula：a33Signal injection method third impact factor, RgTo be grounded transition resistance during failure；
The impact factor of wavelet analysis method includes：
a41=Kφ, in formula：a41For first impact factor of wavelet analysis method, KφFor voltage higher harmonic content.
3. a kind of distribution network fault line selection adaptability teaching decision-making technique according to claim 1, it is characterised in that：It will not
Dimension is gone to handle with the impact factor under dimension, for different line selection modes, form the side of unified forward directionization evaluation index
Method includes：
Step 2.1, calculating zero-sequence current include than the method for width method evaluation index：
Dimension is gone to obtain impact factor：
Impact factor forward direction is obtained：
a″12=a '12
Then zero-sequence current is expressed as than the evaluation index of width method：
μ1=a "11a″12a″13a″14；
Step 2.2 calculates zero-sequence current active component method evaluation index method including dimension being gone to obtain impact factor：
Impact factor forward direction：
a″21=a '21
a″22=a '22
Then the evaluation index of zero-sequence current active component method is expressed as：
μ2=a "21a″22；
Step 2.3, calculating signal injection method evaluation index method include：Dimension is gone to obtain impact factor：
Impact factor forward direction：
a″31=a '31
a″32=a '32
Then the evaluation index of zero-sequence current active component method is expressed as：
μ3=a "31a″32a″33；
Step 2.4, calculating wavelet analysis method evaluation index method include：
Wavelet analysis method impact factor only has one kind, and negatively correlated with route selection accuracy, then will directly be represented after its forward directionization
For wavelet analysis method evaluation index, then the evaluation index of wavelet analysis method is expressed as：
In formula：a11It is zero-sequence current than first impact factor of width method；a12It is zero-sequence current than second impact factor of width method；
a13It is zero-sequence current than width method third impact factor, a14It is zero-sequence current than the 4th impact factor of width method；a′11For the amount of going
Zero-sequence current is than first impact factor of width method after guiding principle；a′12For go after dimension zero-sequence current than width method second influence because
Son；a′13It is zero-sequence current after going dimension than width method third impact factor；a′14It is zero-sequence current after going dimension than width method
4th impact factor；a″11It is zero-sequence current after forward directionization than first impact factor of width method；a″12For zero sequence electricity after forward directionization
Stream is than second impact factor of width method；a″13It is zero-sequence current after forward directionization than width method third impact factor；a″14For forward directionization
Zero-sequence current is than the 4th impact factor of width method afterwards；a21For first impact factor of zero-sequence current active component method；a22For zero sequence
Second impact factor of active component of current method；a'21To remove first impact factor of zero-sequence current active component method after dimension；
a'22To remove second impact factor of zero-sequence current active component method after dimension；a″21For active point of zero-sequence current after forward directionization
First impact factor of amount method；a″22For second impact factor of zero-sequence current active component method after forward directionization；a31It is noted for signal
Enter first impact factor of method；a32For second impact factor of signal injection method；a33For signal injection method third influence because
Son；a'31To remove first impact factor of signal injection method after dimension；a'32To remove second shadow of signal injection method after dimension
Ring the factor；a'33To remove signal injection method third impact factor after dimension；a″31For signal injection method after forward directionization first
Impact factor；a″32For second impact factor of signal injection method after forward directionization；a″33For signal injection method third after forward directionization
Impact factor；a41For first impact factor of wavelet analysis method；μ1It is zero-sequence current than width method route selection evaluation index；μ2For zero sequence
Active component of current method route selection evaluation index；μ3For signal injection method route selection evaluation index；μ4Refer to for wavelet analysis method route selection evaluation
Mark；μmaxRepresent μ1,μ2,μ3,μ4In maximum value；μminRepresent μ1,μ2,μ3,μ4In minimum value.
4. a kind of distribution network fault line selection adaptability teaching decision-making technique according to claim 1, it is characterised in that：Step
3 it is described the evaluation index of each line selection mode is made into normalized, index maximum value forms ideal sample, index minimum value structure
Method into negative ideal sample includes：
Route selection evaluation index is normalized according to following formula for step 3.1
Step 3.2, index maximum value form ideal sampleIndex minimum value forms negative preferable sample
This
In formula：It is zero-sequence current after normalization than width method route selection evaluation index；For zero-sequence current active component after normalization
Method route selection evaluation index；For signal injection method route selection evaluation index after normalization；For wavelet analysis method route selection after normalization
Evaluation index.
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