CN109901015A - Fault line selection method for single-phase-to-ground fault based on Discrete Orthogonal S-transformation and information divergence - Google Patents
Fault line selection method for single-phase-to-ground fault based on Discrete Orthogonal S-transformation and information divergence Download PDFInfo
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Abstract
The invention discloses a kind of fault line selection method for single-phase-to-ground fault based on Discrete Orthogonal S-transformation and information divergence, this method include installing the transient voltage signal of voltage collecting device each feeder line when route is to acquire line fault；Data processing module connects voltage collecting device and the transformation transient voltage signal into zero mode voltage component；Data processing module sends fault initiating signal to host computer, the zero-sequence current acquisition module for being installed on route acquires the zero sequence current signal of each feeder line and sends supreme position machine, for Discrete Orthogonal S-transformation zero sequence current signal to obtain the information divergence of each feeder line, the route with maximum information divergence is singlephase earth fault route.It realizes and solves route selection of the information divergence to distribution circuit single-phase earth fault using the first half-wave zero-sequence current parameter after failure.The present invention has comprehensively considered Discrete Orthogonal S-transformation and has divided ability and information divergence to the separating capacity of signal fine difference to the frequency band of transient signal, improves the reliability of route selection.
Description
Technical field
The invention belongs to electric power network technique fields, especially a kind of to be connect based on Discrete Orthogonal S-transformation and the single-phase of information divergence
Earth fault selection method.
Background technique
In China 6-66kV mesolow distribution, most of methods of operation using isolated neutral or resonance grounding,
It is referred to as small current neutral grounding system.In distribution network failure, the occurrence probability highest of singlephase earth fault, account for sum 80% with
On.Failure phase-to-ground voltage is zero after single phase metal ground connection occurs for distribution network systems, and non-faulting phase voltage rises to line voltage, three
Phases line voltage is still symmetrical, does not influence load power supply, and related regulation allows system to operate with failure 2h, therefore, it is necessary to as early as possible really
The route of failure generation is determined to exclude in time.
The selection method of early stage be by detecting failure after, method that manually outlet is successively operated a switch one by one determining therefore
Hinder route, it is laborious and bothersome, it not can guarantee the reliability and safety of power grid power supply.Existing selection method is mostly by respectively going out
The difference variation characteristic such as the frequency of line current and direction realizes route selection, commonly includes: according to the method for fault current route selection
Zero-sequence current relative phase method, colony amplitude comparison phase comparing method, harmonic component method, remnant current increment method and negative-sequence current route selection method.Although
Various line selection algorithms have certain route selection accuracy rate, but all inevitably there is operating dead zones.Thus single route selection
Method is not able to satisfy the requirement of distribution single-phase fault route selection increasingly.And more criterion route selections of a variety of line selection algorithms are merged, each algorithm
It can be complementary to one another, overcome respective operating dead zone, there is more efficient more accurate route selection accuracy.
Disclosed above- mentioned information are used only for enhancing the understanding to background of the present invention in the background section, it is thus possible to
Information comprising not constituting the prior art known to a person of ordinary skill in the art in home.
Summary of the invention
Aiming at the problems existing in the prior art, the present invention, which passes through, acquires the temporary of each feeder line when singlephase earth fault occurs
State zero-sequence current simultaneously carries out the information that each feeder line is solved after Discrete Orthogonal S-transformation to the waveform of zero-sequence current first half-wave after a failure
Divergence, the criterion according to the size of information divergence as failure line selection are suitable for distribution line and benefit when singlephase earth fault occur
With zero-sequence current and its characteristic parameter route selection.
The purpose of the present invention is being achieved by the following technical programs, one kind is dissipated based on Discrete Orthogonal S-transformation and information
The fault line selection method for single-phase-to-ground fault of degree the following steps are included:
In first step, the transient voltage letter of installation voltage collecting device each feeder line when route is to acquire line fault
Number；
In second step, data processing module connects voltage collecting device and the transformation transient voltage signal into zero mould electricity
Press component；
In third step, data processing module sends fault initiating signal to host computer, is installed on the zero-sequence current of route
Acquisition module acquires the zero sequence current signal of each feeder line and sends supreme position machine, and Discrete Orthogonal S-transformation zero sequence current signal is to obtain
To the information divergence of each feeder line, the route with maximum information divergence is singlephase earth fault route.
In the method, voltage acquisition module acquires transient voltage signal ua, ub and uc of n route, and by transient state
Voltage signal is sent into data processing module, and data processing module is based on triumphant human relations Bell phase-model transformation and obtains zero mode voltage component.
In the method, in second step, data processing module is via following formula transformation transient voltage signal at zero mould electricity
Component is pressed,
Wherein,
u0--- the zero _exit of voltage；
u1--- 1 mold component of voltage；
u2--- 2 mold components of voltage；
ua--- A phase voltage；
ub--- B phase voltage；
uc--- C phase voltage.
In the method, in third step, compares the modulus value of zero mode voltage component and the virtual value of phase voltage, be based on down
Formula judges whether to meet fault initiating condition, u0> 0.15um, in formula: u0--- the zero _exit of voltage；um--- phase voltage
Virtual value, if meeting fault initiating condition, data processing module sends fault initiating signal to host computer；Otherwise, terminate stream
Journey.
In the method, in third step, zero-sequence current acquisition module receives fault initiating instruction, each feeder line installation
First half-wave zero sequence current signal after failure is simultaneously sent to host computer by zero sequence CT acquisition zero sequence current signal.
In the method, in third step, host computer by following formula to zero sequence current signal Discrete Orthogonal S-transformation,
In formula:
N --- total line number；
i1、i2、in--- the 1st, 2, the zero-sequence current of n articles of route；
S1、S2、Sn--- the 1st, 2, the discrete value after the zero-sequence current Discrete Orthogonal S-transformation of n articles of route；
N --- positive integer；
K --- k 0,1,2 ... N-1；
T --- the frequency of acquisition signal；
τ --- time interval；
The centre frequency of υ --- frequency band.
In the method, in third step, it is discrete after each feeder line zero sequence current signal via following formula obtain information dissipate
KL is spent,
In formula:
Hi--- the total energy value on i-th line road under the frequency band of selection；
Si--- the discrete value after the zero-sequence current S-transformation on i-th line road；
KLi--- information divergence of the i-th line road with respect to All other routes；
KLij--- information divergence of the i-th line road with respect to j-th strip route；
The frequency band of λ --- selection.
In the method, in third step, the feeder line D in n route with maximum information divergence is selected by following formula,
KLD=max { KL1, KL2... KLn, in formula:
D --- the route with maximum information divergence；
KL1、KL2, KLn --- the 1st, 2, n articles of route with respect to All other routes information divergence.
In the method, in third step, whether the information divergence of the feeder line D selected by following formula judgement is much larger than it
The respective value of his route,
KLD> > KLi(i=1,2 ... n and i ≠ D), in formula:
KLD、KLi--- D, i articles of routes complete failure choosing if meeting criterion with respect to the information divergence of All other routes
Line, D route are the route that singlephase earth fault occurs, and issue pre-alert notification staff immediately and check failure in time；Otherwise,
" suspected malfunctions " notice is issued, first step is then return to.
In the method, the voltage acquisition module includes n voltage collecting device, and voltage collecting device includes three-phase
Ceramic condenser divider, the ceramic condenser divider includes the sampling capacitance that is connected between overhead line and ground and partial pressure electricity
Hold, the zero-sequence current module includes n zero sequence CT, and wherein n is total line number.
Beneficial effects of the present invention
The invention comprehensively utilizes zero mode voltage of route and zero-sequence current parameters, are obtained by the phase-model transformation of transient voltage
Criterion is provided for fault initiating to zero mode voltage, information needed divergence parameter is acquired by the transformation to zero-sequence current and completes choosing
Line reduces a possibility that judging by accident as far as possible.Discrete Orthogonal S-transformation constructs a sequence in different time points to each frequency band
It is multiplied after Discrete Orthogonal base with sampled signal, obtains the time-frequency matrix divided based on frequency band, and demonstrate the S-transformation of some function
It can be obtained by its wavelet transformation by phasing, the ability that there is S-transformation preferable time frequency resolution and time-frequency to position,
It can be good at the local feature for reflecting non-stationary signal, be very suitable for carrying out the zero sequence current signal occurred in transient fault
Feature extraction and local specificity analysis, information divergence is otherwise known as Kullback-Leibler divergence (KL divergence), for measuring
The asymmetry parameter of difference between two probability distribution.The subtle difference between two signals can be amplified by information divergence
Different, the algorithm synthesis that the present invention uses considers Discrete Orthogonal S-transformation and divides ability and information divergence to the frequency band of transient signal
Parameter improves the reliability of route selection to the separating capacity of signal fine difference
The above description is only an overview of the technical scheme of the present invention, in order to make technological means of the invention clearer
Understand, reach the degree that those skilled in the art can be implemented in accordance with the contents of the specification, and in order to allow the present invention
Above and other objects, features and advantages can be more clearly understood, illustrated below with a specific embodiment of the invention
Explanation.
Detailed description of the invention
By reading the detailed description in hereafter preferred embodiment, various other advantages and benefits of the present invention
It will become apparent to those of ordinary skill in the art.Figure of description only for the purpose of illustrating preferred embodiments,
And it is not to be construed as limiting the invention.It should be evident that drawings discussed below is only some embodiments of the present invention,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.And throughout the drawings, identical component is presented with like reference characters.
In the accompanying drawings:
Fig. 1 is single-phase earth fault line selection system structure diagram of the invention；
Fig. 2 is single-phase earth fault line selection flow diagram of the invention.
Below in conjunction with drawings and examples, the present invention will be further explained.
Specific embodiment
The specific embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although being shown in attached drawing of the invention
Specific embodiment, it being understood, however, that may be realized in various forms the present invention without that should be limited by embodiments set forth here
System.It is to be able to thoroughly understand the present invention on the contrary, providing these embodiments, and can be complete by the scope of the present invention
Be communicated to those skilled in the art.
It should be noted that having used some vocabulary in the specification and claims to censure specific components.Ability
Field technique personnel it would be appreciated that, technical staff may call the same component with different nouns.This specification and right
It is required that not in such a way that the difference of noun is as component is distinguished, but with the difference of component functionally as differentiation
Criterion."comprising" or " comprising " as mentioned throughout the specification and claims are an open language, therefore should be solved
It is interpreted into " including but not limited to ".Specification subsequent descriptions are to implement better embodiment of the invention, so the description be with
For the purpose of the rule of specification, the range that is not intended to limit the invention.Protection scope of the present invention is when the appended right of view
It is required that subject to institute's defender.
In order to facilitate understanding of embodiments of the present invention, further by taking specific embodiment as an example below in conjunction with attached drawing to be solved
Explanation is released, and each attached drawing does not constitute the restriction to the embodiment of the present invention.
A kind of fault line selection method for single-phase-to-ground fault method based on Discrete Orthogonal S-transformation and information divergence includes following step
It is rapid:
In first step S1, the transient voltage letter of installation voltage collecting device each feeder line when route is to acquire line fault
Number；
In second step S2, data processing module connects voltage collecting device and the transformation transient voltage signal into zero mould
Component of voltage；
In third step S3, data processing module sends fault initiating signal to host computer, is installed on the zero sequence electricity of route
Stream acquisition module acquire the zero sequence current signal of each feeder line and send supreme position machine, Discrete Orthogonal S-transformation zero sequence current signal with
The information divergence of each feeder line is obtained, the route with maximum information divergence is singlephase earth fault route.
The Discrete Orthogonal S-transformation is extracted to noise not for converting to the transient zero-sequence current of faulty line
Sensitive characteristic quantity, is able to reflect out the local characteristics of zero-sequence current.The information divergence method is for measuring each feeder line event
First half-wave transient zero-sequence current and calculates each feeder line transient zero-sequence current signal in the difference of waveform by way of summation after barrier
Relative to the information divergence of other feeder line transient zero-sequence current signals, the size according to each feeder line information divergence selects fault wire
Road.
In one embodiment of the method, voltage acquisition module acquires the transient voltage signal u of n routea、ub
And uc, and transient voltage signal is sent into data processing module, data processing module is based on triumphant human relations Bell phase-model transformation and obtains zero
Mode voltage component.
In one embodiment of the method, in second step S2, data processing module converts transient state via following formula
Voltage signal at zero mode voltage component,
Wherein,
u0--- the zero _exit of voltage；
u1--- 1 mold component of voltage；
u2--- 2 mold components of voltage；
ua--- A phase voltage；
ub--- B phase voltage；
uc--- C phase voltage.
In one embodiment of the method, in third step S3, compare the modulus value and mutually electricity of zero mode voltage component
The virtual value of pressure judges whether to meet fault initiating condition, u based on following formula0> 0.15um, in formula: u0--- zero mould of voltage point
Amount；um--- the virtual value of phase voltage, if meeting fault initiating condition, it is supreme that data processing module sends fault initiating signal
Position machine；Otherwise, terminate process.
In one embodiment of the method, in third step S3, zero-sequence current acquisition module receives fault initiating
First half-wave zero sequence current signal after failure is simultaneously sent to by instruction, the zero sequence CT acquisition zero sequence current signal of each feeder line installation
Position machine.
In one embodiment of the method, in third step S3, host computer is by following formula to zero sequence current signal
Discrete Orthogonal S-transformation,
In formula:
N --- total line number；
i1、i2、in--- the 1st, 2, the zero-sequence current of n articles of route；
S1、S2、Sn--- the 1st, 2, the discrete value after the zero-sequence current Discrete Orthogonal S-transformation of n articles of route；
N --- positive integer；
K --- k 0,1,2 ... N-1；
T --- the frequency of acquisition signal；
τ --- time interval；
The centre frequency of υ --- frequency band.
In one embodiment of the method, in third step S3, it is discrete after each feeder line zero sequence current signal warp
Information divergence KL is obtained by following formula,
In formula:
Hi--- the total energy value on i-th line road under the frequency band of selection；
Si--- the discrete value after the zero-sequence current S-transformation on i-th line road；
KLi--- information divergence of the i-th line road with respect to All other routes；
KLij--- information divergence of the i-th line road with respect to j-th strip route；
The frequency band of λ --- selection.
In one embodiment of the method, in third step S3, being selected by following formula has maximum in n route
The feeder line D of information divergence,
KLD=max { KL1, KL2... KLn, in formula:
D --- the route with maximum information divergence；
KL1、KL2, KLn --- the 1st, 2, n articles of route with respect to All other routes information divergence.
In one embodiment of the method, in third step S3, pass through the information for the feeder line D that following formula judgement is selected
Whether divergence is much larger than the respective value of All other routes,
KLD> > KLi(i=1,2 ... n and i ≠ D), in formula:
KLD、KLi--- D, i articles of routes complete failure choosing if meeting criterion with respect to the information divergence of All other routes
Line, D route are the route that singlephase earth fault occurs, and issue pre-alert notification staff immediately and check failure in time；Otherwise,
" suspected malfunctions " notice is issued, first step is then return to.
In one embodiment of the method, the voltage acquisition module includes n voltage collecting device, and voltage is adopted
Acquisition means include the ceramic condenser divider of three-phase, and the ceramic condenser divider includes being connected to adopting between overhead line and ground
Sample capacitor and derided capacitors, the zero-sequence current module include n zero sequence CT, and wherein n is total line number.
It is single-phase earth fault line selection system structure of the invention referring to Fig. 1 and Fig. 2 for a further understanding of the present invention
Block diagram and flow diagram.Specific steps are as follows:
Voltage acquisition module acquires the transient voltage signal u of n routea、ubAnd uc, voltage signal is sent into data processing
Module.
Data processing module obtains zero mode voltage using triumphant human relations Bell phase-model transformation, and specific transform method is as shown in Equation 1:
In formula:
u0--- 0 mold component of voltage；
u1--- 1 mold component of voltage；
u2--- 2 mold components of voltage；
ua--- A phase voltage；
ub--- B phase voltage；
uc--- C phase voltage.
The modulus value of zero mode voltage is compared with the virtual value of phase voltage, judges whether to meet fault initiating condition, sentence
Disconnected foundation is such as formula 2:
u0> 0.15umFormula 2
In formula:
u0--- 0 mold component of voltage；
um--- the virtual value of phase voltage.
If meeting criterion, data processing module sends enabling signal to host computer；Otherwise, terminate process.
Zero-sequence current module receives enabled instruction, and the zero sequence CT of each feeder line installation acquires zero-sequence current, and will be after failure
First half-wave zero sequence current signal is uploaded to host computer, waits to be processed.
Upper computer module carries out Discrete Orthogonal S-transformation to zero sequence current signal, such as formula 3:
In formula:
N --- total line number；
i1、i2、in--- the 1st, 2, the zero-sequence current of n articles of route；
S1、S2、Sn--- the 1st, 2, the discrete value after the zero-sequence current Discrete Orthogonal S-transformation of n articles of route；
N --- positive integer；
K --- k 0,1,2 ... N-1；
T --- the frequency of acquisition signal；
τ --- time interval；
The centre frequency of υ --- frequency band.
After Discrete Orthogonal S-transformation, information divergence KL is sought to each feeder line zero sequence current signal after discrete, such as formula 4:
It enables
In formula:
Hi--- the total energy value on i-th line road under the frequency band of selection；
Si--- the discrete value after the zero-sequence current S-transformation on i-th line road；
KLi--- information divergence of the i-th line road with respect to All other routes；
KLij--- information divergence of the i-th line road with respect to j-th strip route；
The frequency band of λ --- selection.
Host computer selects the feeder line D in n route with maximum information divergence, choosing method such as formula 5:
KLD=max { KL1, KL2... KLnFormula 5
In formula:
D --- the route with maximum information divergence；
KL1、KL2, KLn --- the 1st, 2, n articles of route with respect to All other routes information divergence.
Judge whether the information divergence of the feeder line D selected is far longer than the respective value of All other routes, criterion such as formula 6:
KLD> > KLi(i=1,2 ... n and i ≠ D) formula 6
In formula:
KLD、KLi--- information divergence of D, i articles of routes with respect to All other routes.
If meeting criterion, failure line selection is completed, D route is the route that singlephase earth fault occurs, and is issued immediately pre-
Police notifies staff to check failure in time；Otherwise, " suspected malfunctions " notice is issued, the first step is then return to.
In one embodiment, a kind of fault line selection method for single-phase-to-ground fault based on Discrete Orthogonal S-transformation and information divergence
In, the transient voltage signal of each feeder line, data processing module when using the voltage collecting device acquisition failure installed on the line
Transient voltage signal is converted to obtain zero mode voltage component, as the criterion for judging whether to meet fault initiating condition, at data
It manages module and uploads enabling signal to host computer, the zero-sequence current acquisition module on route acquires the zero sequence current signal of each feeder line simultaneously
It is uploaded to host computer, Discrete Orthogonal S-transformation is carried out to zero-sequence current and then solves the information divergence of each feeder line, selecting has most
The route of big information divergence is as singlephase earth fault route.
In one embodiment, the voltage collecting device can be made of n ceramic condenser divider of total line number, be used
In the acquisition of gathering line road transient voltage signal.Ceramic condenser divider is electric by the sampling being connected between overhead transmission line and ground
Hold and constituted with derided capacitors, the input terminal of sampling capacitance is connected electrically on overhead transmission line, the output end and partial pressure electricity of sampling capacitance
Hold input terminal electrical connection, the output end ground connection of derided capacitors.
In one embodiment, the zero-sequence current acquisition module can be made of n three-phase CT zero-sequence current acquisition device,
For acquiring the transient zero-sequence current of n route three-phase.Polar end, the non-polar end of three CT secondary circuits on every route
It is separately connected, is then connected then at load, collected zero-sequence current is the summation of three-phase zero-sequence current.
The transient zero-sequence current of each feeder line when by acquisition singlephase earth fault occurs for the present invention simultaneously exists to zero-sequence current
The information divergence for solving each feeder line after failure after the waveform progress Discrete Orthogonal S-transformation of first half-wave, according to the size of information divergence
Criterion as failure line selection.
In one embodiment, the voltage acquisition module is made of n voltage collecting device, and wherein n is total line
Number, for acquiring transient voltage when each feeder fault.
In one embodiment, the zero-sequence current module is made of n zero sequence CT, and wherein n is total line number, is used
Transient zero-sequence current when acquiring each feeder fault.
In one embodiment, the data processing module collects transient voltage signal and to transient voltage
It carries out phase-model transformation and obtains zero mode voltage, compare zero mode voltage and phase voltage virtual value judges whether to issue enabling signal.
In one embodiment, the host computer carries out Discrete Orthogonal S to signal after receiving the zero-sequence current of each feeder line
Then transformation calculates the information divergence of each feeder line, complete route selection as faulty line according to the route with maximum information divergence
And issue early warning.
In one embodiment, the voltage collecting device described in is made of the ceramic condenser divider of three-phase, every group of pottery
Porcelain capacitive divider contains the sampling capacitance and derided capacitors being connected between overhead line and ground, and ceramic condenser divider can pacify
The support in interior insulator, with conventional insulators and insulating effect are set, while the transient voltage letter for acquiring each feeder line
Number.
In one embodiment, the fault line selection method for single-phase-to-ground fault includes that will be acquired by triumphant human relations Bell transformation
The transient voltage of n route seek zero _exit and obtain zero mode voltage.It is three that triumphant human relations Bell transformation, which can decouple three-phase system,
The autonomous system of a no coupled relation is obtained phase-model transformation using failure boundary condition when singlephase earth fault occurs for system
0 mould, 1 mould and 2 mold components arrived constitute compound die component network, can accurately analyze the transient voltage information of failure, transformation side
Method such as following formula:
xm=S-1X, in formula: x --- phase vector；
xm--- mould vector；
S-1--- the inverse matrix of phase-model transformation.
The transform method of zero mode voltage such as following formula:
In:
u0--- 0 mold component of voltage；
u1--- 1 mold component of voltage；
u2--- 2 mold components of voltage；
ua--- A phase voltage；
ub--- B phase voltage；
uc--- C phase voltage.
It is not zero in view of zero mode voltage of distribution line that imbalance existing for three-phase system when working normally will lead to
The modulus value of zero mode voltage is compared, judgement is by phenomenon after phase-model transformation acquires zero mode voltage with the virtual value of phase voltage
It is no to meet fault initiating condition, judgment basis such as following formula:
u0> 0.15um, in formula:
u0--- 0 mold component of voltage；
um--- the virtual value of phase voltage.
After judgement meets entry condition, the event of each feeder line is collected and recorded by zero sequence CT described in claims 2
First half-wave zero sequence current signal after barrier.
The frequency content of transient zero-sequence current can change with the variation of fault initial angle.When ground fault occurs
When phase voltage crosses peak value, the energy of zero-sequence current is concentrated mainly on high band；When ground fault generation is attached in phase voltage zero crossing
When close, zero-sequence current main energetic concentrates on low-frequency band.Zero sequence current signal is carried out after the value range of selection frequency band discrete
Zero sequence current signal is resolved into the signal of different frequency bands according to frequency band values by orthogonal S-transformation, obtains corresponding to each feeder line transient state zero
The multiple time-frequency matrix of sequence electric current.Pass through the available amplitude of analysis, the relationship of time and frequency three to multiple time-frequency matrix, tool
Body transform method such as following formula:
In formula:
N --- total line number；
i1、i2、in--- the 1st, 2, the zero-sequence current of n articles of route；
S1、S2、Sn--- the 1st, 2, the discrete value after the zero-sequence current Discrete Orthogonal S-transformation of n articles of route；
N --- positive integer；
K --- k 0,1,2 ... N-1；
T --- the frequency of acquisition signal；
τ --- time interval；
The centre frequency of υ --- frequency band.
Information divergence is also known as KL divergence, measures the difference degree between two probability distribution.The transient state zero of non-fault line
Sequence electric current is mainly formed by the capacitive earth current of route, so the transient zero-sequence current waveform difference between different non-fault lines
It is different little；And therefore transient zero-sequence current is by the folded of non-fault line direct-to-ground capacitance discharge current and arc suppression coil compensation electric current
Add, therefore the transient zero-sequence current different wave shape of faulty line and non-fault line is larger.In order to amplify the difference of small waveform,
Information divergence is sought to each feeder line zero sequence current signal after discrete, formula sees below formula:
It enables
In formula:
Hi--- the total energy value on i-th line road under the frequency band of selection；
Si--- the discrete value after the zero-sequence current S-transformation on i-th line road；
KLi--- information divergence of the i-th line road with respect to All other routes；
KLI, j--- information divergence of the i-th line road with respect to j-th strip route；
The frequency band of λ --- selection.
After the information divergence for solving n route, the route D with maximum information divergence is selected as suspected malfunctions line
Road, such as following formula:
KLD=max { KL1, KL2... KLn,
In formula:
D --- the route with maximum information divergence；
KL1、KL2、KLn--- the 1st, 2, n articles of route with respect to All other routes information divergence.
For exclude error, judge the information divergence of the suspected malfunctions route whether be much larger than other each routes information dissipate
Degree, completes failure line selection if meeting criterion, issues pre-alert notification staff immediately and checks failure in time.Criterion sees below formula:
KLD> > KLi(i=1,2 ... n and i ≠ D), in: KLD、KLi--- information divergence of D, i articles of routes with respect to All other routes.
Although embodiment of the present invention is described in conjunction with attached drawing above, the invention is not limited to above-mentioned
Specific embodiments and applications field, above-mentioned specific embodiment are only schematical, directiveness, rather than restricted
's.Those skilled in the art are under the enlightenment of this specification and in the range for not departing from the claims in the present invention and being protected
In the case where, a variety of forms can also be made, these belong to the column of protection of the invention.
Claims (10)
1. a kind of fault line selection method for single-phase-to-ground fault based on Discrete Orthogonal S-transformation and information divergence, the method includes following
Step:
In first step (S1), the transient voltage letter of installation voltage collecting device each feeder line when route is to acquire line fault
Number；
In second step (S2), data processing module connects voltage collecting device and the transformation transient voltage signal into zero mould electricity
Press component；
In third step (S3), data processing module sends fault initiating signal to host computer, is installed on the zero-sequence current of route
Acquisition module acquires the zero sequence current signal of each feeder line and sends supreme position machine, and Discrete Orthogonal S-transformation zero sequence current signal is to obtain
To the information divergence of each feeder line, the route with maximum information divergence is singlephase earth fault route.
2. voltage acquisition module acquires the transient state of n route the method according to claim 1, wherein preferred
Voltage signal ua、ubAnd uc, and transient voltage signal is sent into data processing module, data processing module is based on triumphant human relations Bell phase
Modular transformation obtains zero mode voltage component.
3. according to the method described in claim 2, wherein, in second step (S2), data processing module converts temporary via following formula
State voltage signal at zero mode voltage component,
Wherein,
u0--- the zero _exit of voltage；
u1--- 1 mold component of voltage；
u2--- 2 mold components of voltage；
ua--- A phase voltage；
ub--- B phase voltage；
uc--- C phase voltage.
4. the method according to claim 1, wherein comparing the mould of zero mode voltage component in third step (S3)
The virtual value of value and phase voltage, judges whether to meet fault initiating condition, u based on following formula0> 0.15um, in formula: u0 --- voltage
Zero _exit；The virtual value of um --- phase voltage, if meeting fault initiating condition, data processing module sends fault initiating
Signal is to host computer；Otherwise, terminate process.
5. the method according to claim 1, wherein zero-sequence current acquisition module receives in third step (S3)
Fault initiating instruction, the zero sequence CT acquisition zero sequence current signal of each feeder line installation and by the first half-wave zero sequence current signal after failure
It is sent to host computer.
6. the method according to claim 1, wherein host computer is by following formula to zero sequence in third step (S3)
Current signal Discrete Orthogonal S-transformation,
In formula:
N --- total line number；
i1、i2、in--- the 1st, 2, the zero-sequence current of n articles of route；
S1、S2、Sn--- the 1st, 2, the discrete value after the zero-sequence current Discrete Orthogonal S-transformation of n articles of route；
N --- positive integer；
K --- k 0,1,2 ... N-1；
T --- the frequency of acquisition signal；
τ --- time interval；
The centre frequency of υ --- frequency band.
7. according to the method described in claim 6, it is characterized in that, in third step (S3), it is discrete after each feeder line zero sequence electricity
It flows signal and obtains information divergence KL via following formula,
In formula:
The total energy value on i-th line road under the frequency band of Hi --- selection；
Discrete value after the zero-sequence current S-transformation on Si --- i-th line road；
KLi --- information divergence of the i-th line road with respect to All other routes；
KLij --- information divergence of the i-th line road with respect to j-th strip route；
The frequency band of λ --- selection.
8. the method according to the description of claim 7 is characterized in that being selected in n route in third step (S3) by following formula
Feeder line D with maximum information divergence,
KLD=max { KL1, KL2... KLn, in formula:
D --- the route with maximum information divergence；
KL1, KL2, KLn --- the 1st, 2, n articles of route with respect to All other routes information divergence.
9. the method according to the description of claim 7 is characterized in that judging the feedback selected by following formula in third step (S3)
Whether the information divergence of line D is much larger than the respective value of All other routes,
KLD> > KLi(i=1,2 ... n and i ≠ D), in formula:
KLD, KLi --- D, i articles of routes complete failure line selection, D if meeting criterion with respect to the information divergence of All other routes
Route is the route that singlephase earth fault occurs, and issues pre-alert notification staff immediately and checks failure in time；Otherwise, it issues
" suspected malfunctions " notice, is then return to first step.
10. the method according to claim 1, wherein the voltage acquisition module includes n voltage acquisition dress
Set, voltage collecting device includes the ceramic condenser divider of three-phase, the ceramic condenser divider include be connected to overhead line and
Sampling capacitance and derided capacitors between ground, the zero-sequence current module include n zero sequence CT, and wherein n is total line number.
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