CN103954884A - Distribution network fault line selection method based on extensional fusion of pattern spectrum analysis and morphological peak and valley detection - Google Patents
Distribution network fault line selection method based on extensional fusion of pattern spectrum analysis and morphological peak and valley detection Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 13
- 230000000877 morphologic effect Effects 0.000 title abstract description 5
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Abstract
The invention relates to a distribution network fault line selection method based on extensional fusion of pattern spectrum analysis and morphological peak and valley detection, and belongs to the technical field of electrical power system relay protection. When a single-phase ground fault happens to a resonant grounded power distribution network, the fault line selection method with the pattern spectrum analysis has the good line selection effect on a fault with a small initial phase angel, and the fault line selection method with peak and valley detection of each feeder zero-sequence current in the feature frequency band has the good line selection effect on a fault with a large initial phase angel. The initial phase angles are calculated, the extension theory is combined, extensional fusion is carried out on the two line selection methods with the fault initial phase angles as weight distribution factors, and symbols relevant to confidence coefficients are used as criterions to achieve fault line selection. Specific examples and a large number of simulation experiments show that the method has applicability and reliability on different fault lines, fault distances, transitional resistances and fault initial phase angles.
Description
Technical field
The present invention relates to a kind of Distribution Network Failure selection method that can open up fusion that detects based on morphology spectrum analysis and morphology peak valley.Belong to Relay Protection Technology in Power System field.
Background technology
Resonant earthed system singlephase earth fault boundary condition is complicated, and the fault signature showing shows larger otherness with the variation of the factors such as initial phase angle, fault distance, transition resistance and load.All there is the risk of erroneous judgement in a certain component in therefore simple operational failure characteristic quantity, when fault signature is not obvious, erroneous judgement risk is higher as the characteristic quantity of failure line selection criterion.When resonant earthed system generation singlephase earth fault and fault occur in voltage and cross near peak value (the initial phase angle of major break down), the principal ingredient of transient zero-sequence current is the capacitive component of high frequency, and transient state feature is now obvious; If when singlephase earth fault occurs near voltage over zero (the initial phase angle of glitch), the principal ingredient of transient zero-sequence current is perceptual weight, transient state feature is now not obvious.Failure line selection for the initial phase angle of major break down is significant with the tool of traveling wave method, and the method is mainly to utilize the size of wavelet modulus maxima and polarity to carry out route selection, claims again wavelet method.The difficult point of wavelet method route selection technology is the selection of wavelet basis function and wavelet decomposition yardstick, in addition when stake resistance is excessive, the high fdrequency component of transient current is less, easily falsely drop, and random noise also can affect to the accuracy of the method, for a kind of distribution network fault line selection method that utilizes form peak valley to detect of the initial phase angle of major break down, have and realize preferably effect.Failure line selection problem for the initial phase angle of glitch is the difficult point of Distribution Network Failure route selection always, utilize the resonance grounding net fault-line selecting method route selection effect of morphology spectrum more obvious, but every kind of selection method all exists certain scope of application.
The comprehensive utilization that information fusion technology is multiple selection method provides theory and technology guarantee.Information fusion is to process for particular system a kind of method that comes from multiple sensors information, be called again Multi-sensor Fusion (MSF), its basic ideas are the information resources that make full use of multisensor, according to certain criterion can redundancy multisensor on time or space or complementary information combine the consistance that obtains detected object and describes or explanation.From layer of structure, divide, information fusion can be divided into data Layer fusion, characteristic layer merges and the fusion of decision-making level.Theory and the method for information fusion are more, common are and can open up theory, D-S evidence theory, fuzzy theory, synergetics, artificial neural network etc.
Summary of the invention
The object of the invention is utilization can open up the theoretical selection method that is applicable to the morphology spectrum analysis of the initial phase angle of glitch is merged with the selection method that is applicable to the morphology peak valley detection of the initial phase angle of major break down and form a kind of new intelligent route selection method, the risk of the erroneous judgement existing to reduce above-mentioned certain selection method of simple use.
Technical scheme of the present invention is: a kind of Distribution Network Failure selection method that can open up fusion that detects based on morphology spectrum analysis and morphology peak valley, after resonant earthed system generation singlephase earth fault, first determine the matter-element three elements of singlephase earth fault, next is to determine by the route selection criterion of the selection method of the selection method of morphology spectrum analysis and the detection of morphology peak valley the characteristic quantity territory that morphology spectrum and peak valley detect, and then on the basis of singlephase earth fault matter-element model, determines respectively the joint territory in morphology spectrum and peak valley detected characteristics amount territory.Based on information such as characteristic quantity territory, fault matter-element model, joint territory and present situation matter-element models, set up correlation function, calculate the initial phase angle of fault and according to the size of the phase angle coefficient that assigns weight.The product of correlation function and weight coefficient is considered as to associated confidence, the numerical symbol of associated confidence is realized to failure line selection as criterion.
Concrete steps are as follows:
A: after the power distribution network generation singlephase earth fault of resonance grounding, utilize morphology spectrum value sum and the ratio thereof of each feeder line zero-sequence current of morphology spectrum analytical technology solving system under positive and negative scale
, select three maximum
value is made as successively
,
,
;
B: utilize peak valley detection technique to solve the peak valley overall characteristic of each feeder line zero-sequence current of system in feature band and the amplitude of first peak valley
, select three absolute value maximums
value is made as successively
,
,
;
C: determine the matter-element three elements of singlephase earth fault, set up the present situation matter-element model of singlephase earth fault matter-element model and faulty line undetermined, set up correlation function;
D: calculate the initial phase angle of fault, determine weight coefficient, calculate the associated confidence of feeder line;
E: the circuit breaking down according to the symbol decision of associated confidence;
F: the matter-element three elements of singlephase earth fault are defined as
,
with
, by things title
be defined as the feeder line set that may break down,
with things
characteristic of correspondence
be defined as
, feature wherein
for morphology spectrum value under the positive and negative scale of each feeder line zero-sequence current and ratio
, feature
for each feeder line zero-sequence current Mintrop wave head peak valley amplitude under feature band
;
G: after fault line selection device starts, intercepting starts front 2 cycles and starts the residual voltage of rear 3 cycle buses.From device Startup time, along time shaft, chase after forward the first day of the lunar month, on the residual voltage of bus, find first amplitude to be less than 0.01
sampled point,
for the rated voltage of bus, the moment occurring the moment of its correspondence as fault
.With
for starting point, choose the sampled point in bus residual voltage one-period, utilize it to calculate phase angle
.
Principle of the present invention is:
1. the selection method basic process based on zero-sequence current morphology spectrum: gather each feeder fault zero-sequence current, after intercepting fault, the zero-sequence current waveform of a timing window carries out multi-scale morphological operations, then its differentiate is obtained the morphology spectrum of each feeder line zero-sequence current, what characterize due to the positive calibration data of morphology spectrum is that echo signal and structural element carry out long-pending variation after opening operation, and therefore just scale is being the presentation of crest; The negative calibration data of contrary morphology spectrum characterizes is that echo signal and structural element carry out long-pending variation after closed operation, and therefore bearing scale is the presentation of trough.So spectrum value on the positive and negative scale of each feeder line zero-sequence current morphology spectrum is sued for peace respectively, then ask its ratio λ, select three maximum λ values and be made as successively
,
,
if meet
>
+
, can judge
bar feeder line breaks down, otherwise judges bus-bar fault.
2. the malfunction route selection method for resonant grounded system basic process detecting based on zero-sequence current morphology peak valley under feature band: after intercepting fault, in a timing window, each feeder line zero-sequence current data utilize small echo to decompose, calculate each feeder line under each frequency band energy and, reject after the frequency band of power frequency place, according to energy and maximum principle, choose the second largest frequency band of energy as feature band.Under feature band, each feeder line zero-sequence current is carried out to wavelet coefficient reconstruct.Wavelet reconstruction coefficient under feature band is carried out to peak valley detection, solve peak valley overall characteristic and calculate each feeder line zero-sequence current Mintrop wave head peak valley amplitude
.Build failure line selection criterion, do to give a definition:
（1）
In formula,
the sudden change direction that represents all feeder line zero-sequence current Mintrop wave head integral body;
represent the
the polarity of bar feeder line zero-sequence current Mintrop wave head, when testing result is crest
, when testing result is trough
.
When
time, judge the
feeder line is fault feeder; When
time, judge the
bar feeder line is for perfecting feeder line; When all
time, judge bus-bar fault.During simple use morphology peak valley detection method, this criterion is comparatively directly perceived.But in order to meet the conditional request that can open up fusion, must build new criterion mode.
From calculating each feeder line zero-sequence current Mintrop wave head peak valley amplitude of trying to achieve
in, select three absolute value maximums
value is made as successively
,
,
, when
time, judge the
bar feeder line breaks down, otherwise judges bus-bar fault.
3. based on morphology spectrum analysis and morphology peak valley, detect the ultimate principle of the Distribution Network Failure selection method that can open up fusion: the matter-element three elements of determining singlephase earth fault
,
with
.By things title
be defined as the feeder line set that may break down,
, in formula
represent respectively feeder line
break down.With things
characteristic of correspondence
be defined as
, feature wherein
for morphology spectrum value under the positive and negative scale of each feeder line zero-sequence current and ratio
, feature
for each feeder line zero-sequence current Mintrop wave head peak valley amplitude under feature band
.
First, from the aforementioned selection method based on zero-sequence current morphology spectrum, when the initial phase angle of fault hour, the amount territory of this feature of morphology spectrum is two parts.
(1) if
be false, bus-bar fault, the amount territory of this feature of morphology spectrum
for
（2）
(2) if
set up, feeder line
fault, another amount territory of morphology spectrum feature
for
（3）
From the aforementioned selection method detecting based on zero-sequence current peak valley, when the initial phase angle of fault is larger, the amount territory that peak valley detects this feature is also two parts.
(1) if
be false, bus-bar fault, detects the amount territory of this feature about peak valley
for
（4）
(2) if
set up, feeder line
fault, about another amount territory of peak valley detected characteristics
for
（5）
Above-mentioned in various
,
,
,
with
,
,
,
the coefficient opened up in the amount of being respectively territory, for specific resonant earthed system, determines by a large amount of historical datas or emulation experiment data.
Secondly, set up singlephase earth fault matter-element model.Feeder line
the matter-element model that singlephase earth fault occurs is,
（6）
In formula,
for
feeder fault is about feature
the amount territory of allowing.Hence one can see that, and the amount territory value of each feature can be divided into two parts,
amount territory be taken as
with
,
amount territory be taken as
with
.Determine on this basis the joint territory of characteristic quantity
for,
（7）
（8）
（9）
（10）
Above-mentioned in various
,
,
,
with
,
,
,
be respectively the coefficient opened up in joint territory, for specific resonant earthed system, by a large amount of historical datas or emulation experiment data, determine.
Then, set up faulty line undetermined
present situation matter-element model.
（11）
In formula,
during for system generation singlephase earth fault, feeder line
the actual condition value of each feature.
Set up following correlation function,
（12）
In formula,
, (13)
（14）
for point
with region
distance,
for point
with joint territory
distance.
for
about interval
,
correlation function.When
time, represent
belong to
; When
time, represent
do not belong to
; When
time, be called and can open up territory, represent
have an opportunity to belong to
and numerical value is larger, be transformed into
in chance just larger.
Below, calculate the initial phase angle of fault.When bus residual voltage instantaneous value
be greater than
time, failure line selection road device will start, and device is write down the residual voltage that starts front 2 cycles and start rear 3 cycle buses.Here
generally be taken as 0.15,
rated voltage for bus.From device Startup time, along time shaft, chase after forward the first day of the lunar month, on the residual voltage of bus, find first amplitude to be less than 0.01
sampled point, the moment occurring the moment of its correspondence as fault
.With
for starting point, choose the sampled point in bus residual voltage one-period, utilize it to calculate phase angle
, suppose here residual voltage be sine function and
.Because
larger, the initial phase angle of fault is less, now feature
shared weight is larger, feature
shared weight is less.Otherwise,
less, the initial phase angle of fault is larger, now feature
shared weight is larger, feature
shared weight is less.Therefore can be respectively according to the size of the initial phase angle of the fault coefficient that assigns weight,
（15）
（16）
Therefore, associated confidence is,
(17）
If resonant earthed system feeder line generation singlephase earth fault, works as feeder line
's
in interval
when interior,
, namely
, feeder line is described
in feature
under condition, in associated confidence, judge feeder line
for fault feeder; Otherwise judgement feeder line
for perfecting feeder line.If system busbar breaks down, each feeder line
not in interval
in,
,
, the feature of all feeder lines exists
under condition all not in associated confidence.Therefore can build route selection criterion as follows,
(1) if there is one
make
,
, judgement
break down;
(2) if all
make
all be false,
, judge that bus breaks down.
The present invention compared with prior art tool has the following advantages:
1, the selection method based on zero-sequence current morphology spectrum utilizes multi-scale morphology operations to extract fault zero-sequence current waveform character, there is stronger antijamming capability, and be not subject to the impact of transition resistance size, the method is carried out feature identification mainly for the time domain waveform of zero-sequence current, requiring of signal sampling frequency is low, therefore has feature with low cost.
2, the selection method detecting based on zero-sequence current morphology peak valley under feature band, also be to carry out feature identification for the time domain waveform of zero-sequence current, therefore also possess sample frequency and require feature low and with low cost, the method adopts, under feature band, zero-sequence current is carried out to the detection of morphology peak valley in addition, has further increased robustness and the antijamming capability of the method.
3, the present invention theoretical analyze under selection method and feature band zero-sequence current morphology peak valley by morphology spectrum and detects selection method and merge by opening up, therefore the method not only possesses the advantage of above-mentioned two kinds of selection methods simultaneously, but also has overcome a kind of selection method of simple use and the not high shortcoming of route selection reliability that exists; The method also possesses the remarkable advantage that the initial phase angle size of the fault of not being subject to affects.
Accompanying drawing explanation
Fig. 1 is the power distribution network resonant earthed system realistic model of the embodiment of the present invention 1 and 2;
Fig. 2 is the route selection process flow diagram of the embodiment of the present invention 1 and 2;
Fig. 3 is feeder line after the embodiment of the present invention 1 fault occurs
zero-sequence current oscillogram;
Fig. 4 is feeder line after the embodiment of the present invention 1 fault occurs
zero-sequence current oscillogram;
Fig. 5 is the embodiment of the present invention 1 feeder line
the morphology spectrum of zero-sequence current;
Fig. 6 is the embodiment of the present invention 1 feeder line
the morphology spectrum of zero-sequence current;
Fig. 7 is feeder line under the embodiment of the present invention 1 feature band
the wavelet reconstruction coefficient of zero-sequence current;
Fig. 8 is feeder line under the embodiment of the present invention 1 feature band
the wavelet reconstruction coefficient of zero-sequence current;
Fig. 9 is feeder line under the embodiment of the present invention 1 feature band
the peak valley overall characteristic of zero-sequence current wavelet reconstruction coefficient;
Figure 10 is feeder line under the embodiment of the present invention 1 feature band
the peak valley overall characteristic of zero-sequence current wavelet reconstruction coefficient.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Embodiment 1: set up power distribution network resonant earthed system as shown in Figure 1.System contains 6 feeder lines, the neutral point of zigzag transformer is by arc suppression coil resistance in series ground connection, power supply is that G(is infinitely great), main-transformer is that T, connection type are that YN and d11, no-load voltage ratio are 110 kV/35 kV, TZ is zigzag transformer, arc suppression coil inductance value is L, and the damping resistance of arc suppression coil is R.System feeder line is comprised of overhead transmission line, overhead lines combined with cable and 3 kinds of circuits of cable line.Load is firm power load.The parameter of each feeder line is respectively:
km is pole line;
km is cable feeder line;
km is pole line;
km, is cable mixing feeder line, pole line 12km wherein, cable 5km;
km is pole line;
km is cable feeder line.Wherein, all overhead feeders are JS1 bar type and LGJ-70 type wire, and span is
m, all cable feeder lines are YJV
type cable.For this system based on morphology spectrum analysis and morphology peak valley detect can open up fusion Distribution Network Failure selection method process flow diagram as shown in Figure 2.
Now suppose the feeder line apart from 5km place, top
there is singlephase earth fault, fault moment
ms, the initial phase angle of fault is 15 ° (glitch initial angle), and fault resistance is 20 Ω, and window length is chosen 5ms, and sample frequency is 10kHz.The waveform that obtains each feeder line zero-sequence current by emulation is as shown in Figure 3-4 (with feeder line
with
oscillogram be representative).Waveform after using flat-structure element to each feeder line zero-sequence current fault in first 1/4 cycle carries out morphological operations and asks morphology spectrum under its positive and negative five scales, after normalized, the morphology spectrum that obtains each feeder line zero-sequence current as shown in Fig. 5-6 (with feeder line
with
morphology spectrum be representative).Morphology spectrum value under the positive and negative scale of each feeder line zero-sequence current is sued for peace respectively, then ask its ratio
, result is as shown in table 1
Table 1 feeder line
spectrum value during fault under the positive and negative scale of each feeder line and and spectrum value ratio
Choose three maximum
value, is made as successively
,
,
,
=
=2.1612,
=
=0.6086,
=
=0.5900.
While extracting after fault 5ms, in window, each feeder line zero-sequence current data utilize db4 small echo to carry out 6 layers of decomposition, utilize wavelet coefficient calculate each feeder line under each frequency band energy and, as shown in table 2, the energy that frequency band 0Hz ~ 78.125Hz is corresponding and maximum, energy corresponding to frequency band 312.5 ~ 625 Hz and taking second place.
Table 2 feeder line
each frequency band energy during fault
Reject after power frequency place frequency band (being energy and maximum frequency band 0Hz ~ 78.125Hz), according to energy and maximum principle, choose the second largest frequency band of energy as feature band, i.e. 312.5 ~ 625 Hz.Under feature band, the wavelet reconstruction coefficient of each feeder line zero-sequence current is as Figure 7-8 (with feeder line
with
oscillogram be representative).
The wavelet reconstruction coefficient of zero-sequence current under feature band of take carries out peak valley detection as research object, adopts flat-structure element that length is 3 can obtain the peak valley overall characteristic of the wavelet reconstruction coefficient of zero-sequence current under feature band, result as shown in Fig. 9-10 (with feeder line
with
peak valley overall characteristic be representative).
By zero-sequence current peak valley overall characteristic under feature band, solve the amplitude of the first peak valley of each feeder line
, result is as shown in table 3.
Table 3 feeder line
during fault, peak valley detects the amplitude of the first peak valley of zero-sequence current under rear each feeder line feature band
Choose three absolute value maximums
value, is made as successively
,
,
,
=
=1.872,
=
=-0.467,
=
=-0.433.
Determine the matter-element three elements of singlephase earth fault
,
with
.By things title
be defined as the feeder line set that may break down,
, in formula
represent respectively feeder line
break down.With things
characteristic of correspondence
be defined as
, feature wherein
for the general value of form under the positive and negative scale of each feeder line zero-sequence current and ratio
, feature
for each feeder line zero-sequence current Mintrop wave head peak valley amplitude under feature band
.
From the aforementioned selection method based on zero-sequence current morphology spectrum, its territory of the amount of this feature of morphology spectrum is two parts.
(1) if
be false, bus-bar fault.After the coefficient opened up for this system by the definite amount of a large amount of emulation experiments territory, obtain the amount territory of this feature of morphology spectrum
for
(2) if
set up, feeder line
fault.After the coefficient opened up for this system by the definite amount of a large amount of emulation experiments territory, obtain another amount territory of morphology spectrum feature
for
From the aforementioned selection method detecting based on zero-sequence current peak valley, the amount territory that peak valley detects this feature is also two parts.
(1) if
be false, bus-bar fault.After the coefficient opened up for this system by the definite amount of a large amount of emulation experiments territory, obtain detecting about peak valley the amount territory of this feature
for
(2) if
set up, feeder line
fault.Determine the coefficient opened up of measuring territory by a large amount of emulation experiments for this system after, obtain another amount territory about peak valley detected characteristics
for
Set up singlephase earth fault matter-element model.Feeder line
the matter-element model that singlephase earth fault occurs is,
In formula,
for
feeder fault is about feature
the amount territory of allowing.Hence one can see that, and the amount territory value of each feature can be divided into two parts,
amount territory be taken as
with
,
amount territory be taken as
with
.On this basis, for this system, by a large amount of emulation experiments, determine after coefficient can be opened up in joint territory and obtain saving territory
for,
Set up faulty line undetermined
present situation matter-element model,
In formula,
during for system generation singlephase earth fault, feeder line
the actual condition value of each feature.
Set up following correlation function,
In formula,
,
for point
with region
distance,
for point
with joint territory
distance.
for
about interval
,
correlation function.
According to the size of the initial phase angle of the fault coefficient that assigns weight, be respectively,
，
。
Here
=15 °.Defining associated confidence is,
So for this system, associated confidence computing formula is,
Putting property of association degree result of calculation and the route selection result of each feeder line are as shown in table 4.
Table 4 feeder line
putting property of association degree result of calculation and the route selection result of each feeder line during fault
Route selection result is consistent with the fault feeder of hypothesis, and route selection is correct.
Embodiment 2: for power distribution network resonant earthed system as shown in Figure 1, existing hypothesis is apart from 10km place, top feeder line
there is singlephase earth fault, fault moment
ms, the initial phase angle of fault is 75 ° (major break down initial angle), and fault resistance is 30 Ω, and window length is chosen 5ms, and sample frequency is 10kHz.Failure line selection flow process as shown in Figure 2.
By emulation, obtain each feeder line zero-sequence current waveform, waveform after using flat-structure element to each feeder line zero-sequence current fault in first 1/4 cycle carries out morphological operations and asks morphology spectrum under its positive and negative five scales, after normalized, obtain the morphology spectrum of each feeder line zero-sequence current.Morphology spectrum value under the positive and negative scale of each feeder line zero-sequence current is sued for peace respectively, then ask its ratio
, result is as shown in table 5.
Table 5 feeder line
spectrum value during fault under the positive and negative scale of each feeder line and and spectrum value ratio
Choose three maximum
value, is made as successively
,
,
,
=
=3.1324,
=
=0.6894,
=
=0.5845.
While extracting after fault 5ms, in window, each feeder line zero-sequence current data utilize db4 small echo to carry out 6 layers of decomposition, utilize wavelet coefficient calculate each feeder line under each frequency band energy and.Reject after power frequency place frequency band (being energy and maximum frequency band 0Hz ~ 78.125Hz), according to energy and maximum principle, choose the second largest frequency band of energy as feature band, i.e. 312.5 ~ 625 Hz.Under feature band, the wavelet coefficient of each feeder line zero-sequence current is reconstructed.The wavelet reconstruction coefficient of zero-sequence current under feature band of take carries out peak valley detection as research object, the flat-structure element that employing length is 3 can be obtained the peak valley overall characteristic of the wavelet reconstruction coefficient of zero-sequence current under feature band, and peak valley overall characteristic solves the amplitude of the first peak valley of each feeder line
, result is as shown in table 6
Table 6 feeder line
during fault, peak valley detects the amplitude of the first peak valley of zero-sequence current under rear each feeder line feature band
Choose three absolute value maximums
value, is made as successively
,
,
,
=
=2.3874,
=
=-0.567,
=
=-0.473.
Determine the matter-element three elements of singlephase earth fault
,
with
.By things title
be defined as the feeder line set that may break down,
, in formula
represent respectively feeder line
break down.With things
characteristic of correspondence
be defined as
, feature wherein
for the general value of form under the positive and negative scale of each feeder line zero-sequence current and ratio
, feature
for each feeder line zero-sequence current Mintrop wave head peak valley amplitude under feature band
.
From embodiment 1, the amount territory of the morphology spectrum feature of this system
with
for
The amount territory of peak valley detected characteristics
with
for
Set up singlephase earth fault matter-element model.Feeder line
the matter-element model that singlephase earth fault occurs is,
In formula,
for
feeder fault is about feature
the amount territory of allowing.Hence one can see that, and the amount territory value of each feature can be divided into two parts,
amount territory be taken as
with
,
amount territory be taken as
with
.Joint territory by the characteristic quantity of embodiment 1 known this system
for,
Set up faulty line undetermined
present situation matter-element model,
In formula,
during for system generation singlephase earth fault, feeder line
the actual condition value of each feature.
Associated putting property degree result and the route selection result of according to correlation function formula, weight coefficient, distributing formula to try to achieve each feeder line with associated confidence formula are as shown in table 7.The initial phase angle here
=75 °.
Table 7 feeder line
putting property of association degree result of calculation and the route selection result of each feeder line during fault
Route selection result is consistent with the fault feeder of hypothesis, and route selection is correct.
Claims (3)
1. one kind is detected based on morphology spectrum analysis and morphology peak valley the Distribution Network Failure selection method that can open up fusion, it is characterized in that: after resonant earthed system generation singlephase earth fault, first determine the matter-element three elements of singlephase earth fault, next is to determine by the route selection criterion of the selection method of the selection method of morphology spectrum analysis and the detection of morphology peak valley the characteristic quantity territory that morphology spectrum and peak valley detect, and then on the basis of singlephase earth fault matter-element model, determines respectively the joint territory in morphology spectrum and peak valley detected characteristics amount territory; Based on information such as characteristic quantity territory, fault matter-element model, joint territory and present situation matter-element models, set up correlation function, calculate the initial phase angle of fault and according to the size of the phase angle coefficient that assigns weight; The product of correlation function and weight coefficient is considered as to associated confidence, the numerical symbol of associated confidence is realized to failure line selection as criterion.
2. the Distribution Network Failure selection method that can open up fusion that detects based on morphology spectrum analysis and morphology peak valley according to claim 1, is characterized in that concrete steps are as follows:
A: after the power distribution network generation singlephase earth fault of resonance grounding, utilize morphology spectrum value sum and the ratio thereof of each feeder line zero-sequence current of morphology spectrum analytical technology solving system under positive and negative scale
, select three maximum
value is made as successively
,
,
;
B: utilize peak valley detection technique to solve the peak valley overall characteristic of each feeder line zero-sequence current of system in feature band and the amplitude of first peak valley
, select three absolute value maximums
value is made as successively
,
,
;
C: determine the matter-element three elements of singlephase earth fault, set up the present situation matter-element model of singlephase earth fault matter-element model and faulty line undetermined, set up correlation function;
D: calculate the initial phase angle of fault, determine weight coefficient, calculate the associated confidence of feeder line;
E: the circuit breaking down according to the symbol decision of associated confidence.
3. the Distribution Network Failure selection method that can open up fusion that detects based on morphology spectrum analysis and morphology peak valley according to claim 1, is characterized in that:
F: the matter-element three elements of singlephase earth fault are defined as
,
with
, by things title
be defined as the feeder line set that may break down,
with things
characteristic of correspondence
be defined as
, feature wherein
for morphology spectrum value under the positive and negative scale of each feeder line zero-sequence current and ratio
, feature
for each feeder line zero-sequence current Mintrop wave head peak valley amplitude under feature band
;
G: after fault line selection device starts, intercepting starts front 2 cycles and starts the residual voltage of rear 3 cycle buses;
From device Startup time, along time shaft, chase after forward the first day of the lunar month, on the residual voltage of bus, find first amplitude to be less than 0.01
sampled point,
for the rated voltage of bus, the moment occurring the moment of its correspondence as fault
; With
for starting point, choose the sampled point in bus residual voltage one-period, utilize it to calculate phase angle
.
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