CN107621590A - A kind of fault line selection method for single-phase-to-ground fault based on wavelet energy fuzzy analysis - Google Patents
A kind of fault line selection method for single-phase-to-ground fault based on wavelet energy fuzzy analysis Download PDFInfo
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Abstract
It is this to be based on wavelet energy Fuzzy Analysis Method; utilize the catastrophe characteristicses of zero-sequence current during singlephase earth fault; Multiresolution Decomposition and extraction wavelet energy abrupt information are carried out using wavelet algorithm; Fuzzy processing output is carried out to the small echo low-and high-frequency energy component of each yardstick; again to multiple dimensioned carry out Fuzzy Processing; the output of continuous quantity is ultimately formed, if fuzzy output value is more than some setting value, protection device output fault indication signal and outlet switch action signal.A kind of fault line selection method for single-phase-to-ground fault based on wavelet energy fuzzy analysis of the present invention, many algorithms judge to it also avoid the possibility of algorithm error jointly, can quick and precisely locating bad lines, it not only can greatly improve the automaticity of multi-thread Complicated Distribution Network, and the power off time for making user is greatly shortened, loss, has good social and economic benefit caused by smaller power failure.
Description
Technical field
The present invention relates to a kind of power distribution network earthed system, especially a kind of 10kV power distribution networks compensated distribution network
Fault line selection method for single-phase-to-ground fault.
Background technology
Most of China's power distribution network is using system with non effectively earth ed neutral (isolated neutral or through arc blowout wire at this stage
Circle ground connection), singlephase earth fault accounts for more than the 80% of total breakdown, when one-phase short-circuit current failure occurs, due to the earth
Reactor, therefore short circuit current very little are not directly electrically connected or concatenated between neutral point, and protection device need not be stood
Quarter action tripping operation, so as to improve the reliability of system operation.
But also just because the arc suppression coil of installation makes the short circuit current in single phase grounding very little of the system, faulty line and non-event
Voltage x current amplitude, phase angle on barrier circuit have no too big difference so that the generation position judgment of the failure becomes difficult.But with
Increasing for feeder line, capacitance current increase, long-play is easy for single-phase earthing and becomes multipoint earthing short circuit, and arc grounding is also
The overvoltage of system can be caused, equipment is damaged, the safe operation of system is destroyed, so faulty line and failure must be found in time
Place.Influenceed to improve power supply reliability and reduce the power failure that electric network fault brings, power supply enterprise of various countries is all actively implementing
Distribution runs automatic technology, by monitoring in real time, scents a hidden danger in time, avoids the generation of accident, and realizes failure automatically
The service restoration of positioning, isolation and non-fault line, reduce the fault outage time.Single-line to ground fault as odds most
Big short trouble type, the position of failure generation how is timely and accurately found after singlephase earth fault occurs for power distribution network,
Isolated fault region and the normal power supply for recovering non-faulting region, it is a weight in the research of current power distribution network singlephase earth fault
Want a purpose.
With the reinforcement of distribution network structure, branched line also increases, and specific trouble point is found out with traditional patrolling method
Position is extremely difficult.This not only consumes a large amount of manpower and materials, and extends power off time, influences power supply reliability.Especially
Be it is difficult in weather severe cold winter or sleety weather, road conditions, it is existing look for trouble point method labor intensity it is very big, it is difficult to adapt to
The demand currently produced.
The content of the invention
The invention solves the shortcomings that above-mentioned prior art, there is provided a kind of output is stable, the power distribution network of accuracy of judgement is through disappearing
The selection method of arc coil single-phase grounded malfunction in grounded system.
The present invention solves the technical scheme that its technical problem uses：It is this to be based on wavelet energy Fuzzy Analysis Method, utilize list
The catastrophe characteristicses of zero-sequence current during phase earth fault, Multiresolution Decomposition and extraction wavelet energy mutation are carried out using wavelet algorithm
Information, Fuzzy processing output is carried out to the small echo low-and high-frequency energy component of each yardstick, then fuzzy place is carried out to multiple dimensioned
Reason, ultimately forms the output of continuous quantity, if fuzzy output value is more than some setting value, protection device output indicating fault letter
Number and outlet switch action signal, the criterion specifically setting it is as follows：
(1) small echo high-frequency energy calculation formula meets formula
EHj=| | Dj(k) | |, j=1,2,3,4,5； ⑴
(2) wavelet low frequency energy balane formula meets formula
ELj=| | Aj(k) | |, j=1,2,3,4,5； ⑵
The output quantity F of fuzzy controlleroutMeet formula (3)
Fout>K； ⑶
Formula (1), (2) in,
EHj：The high-frequency energy of small echo after zero-sequence current decomposes；
ELj：The low frequency energy of small echo after zero-sequence current decomposes；
Dj(k)：The high fdrequency component of wavelet coefficient after zero-sequence current decomposes；
Aj(k)：The low frequency component of wavelet coefficient after zero-sequence current decomposes；
Fout：The output continuous quantity of fuzzy controller；
K：Judge set amount；
Output quantity a, b, c, d, e of FUZZY blur units are 0 to 1 continuous quantities；
The output quantity of fuzzy controller is 0 to 1 continuous quantity.
Preferably, 0.4<K<0.6.
Preferably, the input quantity of FUZZY fuzzy control units, if high-frequency energy is more than low frequency energy, output quantity also phase
It should increase, and high-frequency energy differs more multi output amount with low frequency energy closer to 1；If high-frequency energy is less than low frequency energy, output
Amount is also corresponding to be reduced, and high-frequency energy differs more multi output amount with low frequency energy closer to 0.
Preferably, each input quantity of fuzzy controller is exported also closer to 1 closer to 1.
Preferably, described EH1, EH2, EH3, EH4, EH5Db4, db5, db6, db7 is respectively adopted, db8 wavelet decompositions go out
High-frequency energy part, EL1, EL2, EL3, EL4, EL5Db4, db5, db6, db7, the low frequency energy that db8 wavelet decompositions go out is respectively adopted
Measure part.
Preferably, this method uses the structure of following procedure block diagram, including the filtration of the zero sequence of input and three-phase current
Device, the output end of zero sequence pass filter respectively with db4 wavelet analysises unit, db5 wavelet analysises unit, db6 wavelet analysises unit,
Db7 wavelet analysises unit, the connection of db8 wavelet analysises unit, zero-sequence current calculate by each wavelet analysis unit Scale Decomposition
For high-frequency energy EH1, EH2, EH3, EH4, EH5With low frequency energy EL1, EL2, EL3, EL4, EL5Two parts, high-frequency energy and low frequency energy
It is respectively outputted to respective multiplier K1, K2, K3, K4, K5, K6, K7, K8, K9, K10 to be multiplied, output result is to respective
FUZZY blur units 1, FUZZY blur units 2, FUZZY blur units 3, FUZZY blur units 4, FUZZY blur units 5, respectively
The output quantity of FUZZY blur units is 0-1 successive value a, b, c, d, e, and a, b, c, d, e are exported to the input of fuzzy controller
End, the output 0-1 of fuzzy controller successive value, the positive input terminal of the successive value input comparator, setting value K input comparators
Negative input end, the output route selection result and action signal of comparator.
Invention has the advantages that：Wavelet energy fuzzy algorithmic approach can sensitively detect the mutation of outlet zero-sequence current,
By carrying out Wavelet Multi-resolution Transform to transmission line circuit zero-sequence current and extracting low-and high-frequency energy, pass through Fuzzy comparisons low-and high-frequency
Proportion shared by energy, circuit is illustrated when high fdrequency component proportion reaches certain value there occurs failure, while multiple dimensions is small
Wave Decomposition and the possibility that in particular cases algorithm calculating error is avoided by Fuzzy processing.The technology that the present invention refers to can
With fast positioning faulty line, the automaticity of multi-thread Complicated Distribution Network not only can be greatly improved, and user will be made
Power off time greatly shorten, loss caused by smaller power failure compensate for existing for the small current neutral grounding method of operation insufficient, have
Good social and economic benefit.
Brief description of the drawings
Fig. 1 is the circuit block diagram of selection method of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Embodiment：A kind of fault line selection method for single-phase-to-ground fault based on wavelet energy fuzzy analysis, embodiment be,
The output end of zero sequence pass filter is small with db4 wavelet analysises unit, db5 wavelet analysises unit, db6 wavelet analysises unit, db7 respectively
Wave analysis unit, the connection of db8 wavelet analysises unit, zero-sequence current are calculated as high frequency by each wavelet analysis unit Scale Decomposition
ENERGY EH1, EH2, EH3, EH4, EH5With low frequency energy EL1, EL2, EL3, EL4, EL5Two parts, high-frequency energy are distinguished defeated with low frequency energy
Go out to respective multiplier K1=1, K2=1, K3=1, K4=1, K5=1, K6=1, K7=1, K8=1, K9=1, K10=1
It is multiplied, output result to respective FUZZY blur units 1, FUZZY blur units 2, FUZZY blur units 3, FUZZY are fuzzy single
Member 4, FUZZY blur units 5, the output quantity of each FUZZY blur units are 0-1 successive value a, b, c, d, e, and a, b, c, d, e are defeated
Go out to the input of fuzzy controller, the output 0-1 of fuzzy controller successive value, the positive input of the successive value input comparator
End, the negative input end of setting value K=0.5 input comparators, if the output valve of fuzzy controller is more than 0.5, then comparator is just
Route selection result and action signal can be exported.
This method utilizes the Fuzzy comparisons method that wavelet energy low-and high-frequency is decomposed, and seamlessly transits, the wavelet decomposition of multiple dimensions
And avoid in particular cases algorithm by Fuzzy processing and calculate the possibility to malfunction, single-phase earthing event can be accurately judged to
Hinder outlet.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
Into technical scheme, all fall within the protection domains of application claims.
Claims (6)
1. a kind of fault line selection method for single-phase-to-ground fault based on wavelet energy Fuzzy Analysis Method, it is characterized in that：Utilize single-phase earthing
The catastrophe characteristicses of zero-sequence current during failure, Multiresolution Decomposition and extraction wavelet energy abrupt information are carried out using wavelet algorithm,
Carry out Fuzzy processing output to the small echo low-and high-frequency energy component of each yardstick, then to multiple dimensioned carry out Fuzzy Processing, most
End form into continuous quantity output, if fuzzy output value is more than some setting value, protection device export fault indication signal with
And outlet switch action signal, specifically setting is as follows for the criterion：
(1) small echo high-frequency energy calculation formula meets formula
EHj=| | Dj(k) | |, j=1,2,3,4,5； ⑴
(2) wavelet low frequency energy balane formula meets formula
ELj=| | Aj(k) | |, j=1,2,3,4,5； ⑵
The output quantity F of fuzzy controlleroutMeet formula (3)
Fout>K； ⑶
Formula (1), (2) in,
EHj：The high-frequency energy of small echo after zero-sequence current decomposes；
ELj：The low frequency energy of small echo after zero-sequence current decomposes；
Dj(k)：The high fdrequency component of wavelet coefficient after zero-sequence current decomposes；
Aj(k)：The low frequency component of wavelet coefficient after zero-sequence current decomposes；
Fout：The output continuous quantity of fuzzy controller；
K：Judge set amount；
Output quantity a, b, c, d, e of FUZZY blur units are 0 to 1 continuous quantities；
The output quantity of fuzzy controller is 0 to 1 continuous quantity.
2. the fault line selection method for single-phase-to-ground fault according to claim 1 based on wavelet energy Fuzzy Analysis Method, its feature
It is：0.4<K<0.6.
3. the fault line selection method for single-phase-to-ground fault according to claim 1 based on wavelet energy Fuzzy Analysis Method, its feature
It is：The input quantity of FUZZY fuzzy control units, if high-frequency energy is more than low frequency energy, output quantity also accordingly increases, and high-frequency energy
Amount differs more multi output amount with low frequency energy closer to 1；If high-frequency energy is less than low frequency energy, output quantity also accordingly reduces, and
High-frequency energy differs more multi output amount with low frequency energy closer to 0.
4. the fault line selection method for single-phase-to-ground fault according to claim 1 based on wavelet energy Fuzzy Analysis Method, its feature
It is：Each input quantity of fuzzy controller is exported also closer to 1 closer to 1.
5. the fault line selection method for single-phase-to-ground fault according to claim 1 based on wavelet energy Fuzzy Analysis Method, its feature
It is：Described EH1, EH2, EH3, EH4, EH5It is respectively adopted db4, db5, db6, db7, the high-frequency energy part that db8 wavelet decompositions go out,
EL1, EL2, EL3, EL4, EL5Db4, db5, db6, db7, the low frequency energy part that db8 wavelet decompositions go out is respectively adopted.
6. according to the single-phase earth fault line selection side based on wavelet energy Fuzzy Analysis Method described in claim 1,2,3,4 or 5
Method, it is characterized in that：Using the structure of following procedure block diagram, including the zero sequence pass filter of input and three-phase current, zero sequence filtration
The output end of device respectively with db4 wavelet analysises unit, db5 wavelet analysises unit, db6 wavelet analysises unit, db7 wavelet analysis lists
Member, the connection of db8 wavelet analysises unit, zero-sequence current are calculated as high-frequency energy E by each wavelet analysis unit Scale DecompositionH1,
EH2, EH3, EH4, EH5With low frequency energy EL1, EL2, EL3, EL4, EL5Two parts, high-frequency energy are respectively outputted to each with low frequency energy
Multiplier K1, K2, K3, K4, K5, K6, K7, K8, K9, K10 be multiplied, output result to respective FUZZY blur units 1,
FUZZY blur units 2, FUZZY blur units 3, FUZZY blur units 4, FUZZY blur units 5, each FUZZY blur units
Output quantity is 0-1 successive value a, b, c, d, e, and a, b, c, d, e are exported to the input of fuzzy controller, fuzzy controller it is defeated
Go out 0-1 successive value, the positive input terminal of the successive value input comparator, the negative input end of setting value K input comparators, comparator
Output route selection result and action signal.
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Cited By (1)
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| CN109557395A (en) * | 2018-11-29 | 2019-04-02 | 国网上海市电力公司 | A kind of MTDC transmission system fault detection method based on transient high frequency energy |
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Patent Citations (5)
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| US4878142A (en) * | 1987-09-16 | 1989-10-31 | Asea Brown Boveri Ab | High resistance ground fault protection |
| CN103364684A (en) * | 2013-07-12 | 2013-10-23 | 桐乡市供电局 | Fault line selection method based on wavelet analysis |
| CN105610132A (en) * | 2014-11-13 | 2016-05-25 | 郭振威 | Line and bus protection method based on initial fault angle, transition resistance and machine learning |
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