CN105071362B - A kind of distributed feeder automation new protective method applied to FTU - Google Patents
A kind of distributed feeder automation new protective method applied to FTU Download PDFInfo
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Abstract
The invention discloses a kind of distributed feeder automation new protective method applied to FTU, pass through the zero-sequence current of the feeder line accurate failure judgement moment；Ask for phase current and zero-sequence current transients fault compoment；Four layers of wavelet decomposition are carried out to phase current transients fault compoment and obtain failure phase；Four layers of wavelet decomposition are carried out to zero-sequence current transients fault compoment, whether ground protection is entered by the ratio in judgement of the energy of the free oscillation component of zero-sequence current transients fault compoment；Determine whether the ratio in judgement of failure phase transient state capacity current gross energy and non-faulting phase average transient state capacity current gross energy enters ground protection；Judge whether to enter failure phase ground protection by the cross-correlation coefficient of failure phase and the autocorrelation estimation sequence of other two non-faulting phases.Present invention introduces morphocline technology to zero-sequence current carry out processing extract current break information accurately catch failure occur the moment, based on FTU gather three-phase current information directly accurately identify feeder line whether failure.
Description
Technical field
The present invention relates to field of relay protection in power, and in particular to a kind of distributed feeder line applied to FTU is automatic
Change new protective method.Suitable for system with non effectively earth ed neutral one-phase ground protection.
Background technology
China 66kV and the power distribution network of following voltage class mostly use neutral non-effective grounding mode, often by this germline
It is referred to as small current neutral grounding system.When singlephase earth fault occurs for power network under which, fault current is small (particularly through arc blowout wire
Enclose earthed system), although code allows to continue to run with 1~2 hour, the voltage of ungrounded phase becomes line voltage after failure,
Hidden danger is brought to system insulation and is threatened, it is necessary to faulty line be cut off as early as possible, to avoid generation two points ground fault from turn resulting in short circuit
Accident, it is also possible to which producing ferro-resonance over-voltage causes voltage transformer burnout failure and voltage transformer circuit fuse frequent
Fusing, the security reliability of serious threat power distribution network.Therefore it is correct when singlephase earth fault occurs for small current neutral grounding system and
Faulty line is detected in time, and directly cuts off faulty line automatically or event is released by artificial treatment by signaling
Barrier, to enhancing power supply reliability, realizes that power distribution automation, raising power supply quality and operation level have important practical significance.
The problem of for single-phase earthing of small current earthing system detection difficult, a large amount of colleges and universities both at home and abroad and Utilities Electric Co.'s research and development
Personnel's input research, it is front and rear to propose a variety of protection schemes：Zero-sequence current overcurrent protection, insertion electric-resistivity method, reactive power direction
Protection, harmonic current protection, first half-wave principle, zero sequence admittance ground protection etc., also proposed believed based on wavelet transformation etc. recently
The transient zero-sequence current protection of number processing method.Company have developed the route selection dress based on various protection schemes both at home and abroad simultaneously
Put, be all based on concentrating the fault message (zero-sequence current size and Orientation, reactive power direction etc.) of more each bar outlet, becoming
Concentrated in power station using line selection apparatus and judge or add in main station system to concentrate route selection module.
Existing small current system one-phase ground protection device is still based on the line selection apparatus of stable state power frequency component, according to power
Prestige department statistics result, in actual motion line selection apparatus totality route selection accuracy rate less than 70%, falsely drop, the probability of selective reject very
Greatly, the route selection of stable state power frequency component is influenceed by following several respects：(1) influence of the compensation electric current of arc suppression coil；(2) transition resistance
Influence；(3) influence of current transformer out-of-balance current；(4) influence of earth fault position.
Because several to more than ten times bigger than steady-state component of transients fault compoment can be produced during single-phase earthing, transient state is based on
The small current grounding protection method of signal has good Fault Identification ability, but transient signal time of occurrence is of short duration, decay is fast,
And with High-frequency Interference, relative difficulty is detected, need to be analyzed and processed using suitable modern signal processing method.Now
Processing to fault transient signals typically uses wavelet analysis method, is easily influenceed by impulsive noise.Based on the small of transient signal
Current earthing protection is also in experiment and promotes the stage.
The detection to Feeder typically uses concentration line selection mode, it is necessary to pass through more each bar of concentration at present
The fault message of outlet carrys out failure judgement circuit, in addition it is also necessary to further carry out fault location, Fault Isolation.With distribution automation
Development, the processing of the feeder line Intelligent terminal data such as FTU and storage capacity be very powerful, can meet the requirement of intelligent algorithm；
Some on-load switches and block switch have changed breaker into now simultaneously, with the ability for cut-offfing short circuit current flow, realize small electricity
The distributed ground protection of stream earthed system can once complete route selection, positioning, isolation, realize the distribution of feed line automatization system
Intelligent control, realizes the safety for quickly isolating, ensureing power distribution network and user power utilization safety of failure, more preferably realizes that distribution is automatic
Change.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, there is provided only need feeder line three-phase current information
, the single-phase ground protection method distributed on the spot that FTU can be installed on.
The object of the invention is realized by following technical proposals：
A kind of distributed feeder automation new protective method applied to FTU, comprises the following steps：
Step 1: when the zero-sequence current I0 of feeder line is more than setting current Iset, record current time is fault moment, note
Record the phase current and zero-sequence current of four cycles after the first two cycle of fault moment and fault moment on feeder line；
Step 2: choosing each half period before and after fault moment, a cycle zero sequence current signal is terraced by grayscale morphologic altogether
Filter filtering processing is spent, the zero-sequence current after filtering process occurs when being that accurate failure occurs at the time of first pulse
Carve；
Step 3: on the basis of the moment occurs for the accurate failure obtained by step 2, occurring by asking for failure after the moment
Faulted phase current subtract failure and occur the load phase current before the moment and obtain phase current fault component Δ ip；By asking for failure
Occur the failure zero-sequence current after the moment and subtract the uneven zero-sequence current acquisition zero-sequence current failure point before the failure generation moment
Measure Δ i0；Then the steady-state component in the fault component of phase current and zero-sequence current is filtered out using bandstop filter, mutually electricity is obtained
Flow transients fault compoment Δ ip.trWith zero-sequence current transients fault compoment Δ i0.tr；
Step 4: choosing phase current transients fault compoment Δ ip.trWith zero-sequence current transients fault compoment Δ i0.trMiddle failure
Occur 2 cycle data after the moment, noise suppression preprocessing is filtered using self-adaptive harmonics detection device；
Step 5: using cubic spline wavelet phase current transients fault compoment Δ i pretreated to filtering and noise reductionp.trEnter
Four layers of wavelet decomposition of row, respectively obtain energy of A, B, C three-phase current transients fault compoment on 16 sub-bandsAskWithSelection
WithMiddle maximum is corresponding to be used as failure phase；
Step 6: using cubic spline wavelet zero-sequence current transients fault compoment Δ i pretreated to filtering and noise reduction0.tr
Four layers of wavelet decomposition are carried out, the energy on 16 sub-bands is sought, wherein the energy on (4,0) frequency band is the event of zero-sequence current transient state
Hinder component Δ i0.trDecaying DC component ENERGY El.d, the energy sum on remaining each frequency band be zero-sequence current transient state therefore
Hinder component Δ i0.trFree oscillation component ENERGY Ec.os；
Seek El.dAnd Ec.osRatioDuring η ＞ 1, judge that singlephase earth fault occurs for feeder line, failure is mutually grounded
Protection act；The situation of η≤1 enters back into step 7 and does further differentiation；
Step 7: each 16 frequency band energies for A, B, C the three-phase current transients fault compoment tried to achieve according to step 5AskCorresponding A, B, C phase transient state capacity current gross energy when i takes A, B, CIt is E that failure phase transient state capacity current gross energy is mutually determined according to failurefWith non-faulting phase average transient state
Capacity current gross energy Work as ηp＞ KeWhen, judge that singlephase earth fault, failure phase ground protection occur for feeder line
Action；Work as ηp≤KeWhen, enter back into step 8 and determine whether, KeFor safety coefficient；
Step 8: on except its outer sub-bands of (4,0) frequency band, to feeder line three-phase current transients fault compoment Δ ip.tr's
Waveform-wavelet coefficient carries out correlation analysis, first obtains autocorrelation estimation as autocorrelation analysis to each phase current transients fault compoment
Sequence, then seeks the mutual of failure phase and the autocorrelation estimation sequence of other two non-faulting phase current transients fault compoments respectively
Relation number, asks for the cross correlation of failure phase and the autocorrelation estimation sequence of other two non-faulting phase current transients fault compoments
Several average value, whenWhen judge that singlephase earth fault occurs for feeder line, failure is mutually grounded protection act；WhenWhen judge feeder line do not occur singlephase earth fault.
Self-adaptive harmonics detection device is in step 4 as described above：
Y (x)=α1(x)Oc(f(x))+α2(x)Co(f(x))
α in formula1(x), α2(x) it is weight coefficient, f (x) is pending primary signal, and the structural element used is incremental structure
Element：G=[0.050.10.6], Oc (f (x)) represent to be f (x) form opening and closing operation, Co (f (x) tables using structural element g
Show and form make and break computing is done to f (x) using structural element g.
Grayscale morphologic gradient filter is as described above：
Wherein, g (x) is structural element, and f (x) is pending primary signal,Represent to utilize structural element g
(x) opening operation is done to f (x), (f Θ g) (x) represents to do closed operation to f (x) using structural element g (x).Using incremental structural elements
Element：G=[0.050.10.6].
K as described aboveeTake 1~2；KMTake 0.5-1.
The advantage of the invention is that：
In existing non-effectively earthed system single phase earthing protection scheme, all using concentration line selection apparatus, it is necessary to institute
There is the fault message of outlet, do not meet the requirement of feeder automation.Fault transient when by analyzing single-phase earthing occurs for the present invention
The feature of electric current, introduces morphocline technology and accurately catches failure to zero-sequence current progress processing extraction current break information
At the moment, introduce self-adaptive harmonics detection technology and effectively eliminate white noise and impulsive noise, the three-phase current letter gathered based on FTU
Breath directly accurately identify feeder line whether failure, it is not necessary to other feeder fault information, be truly realized can apply to FTU divide
Cloth one-phase ground protection technology, significantly there is provided feeder automation level.
Brief description of the drawings
Using accompanying drawing, the invention will be further described, but the embodiment in accompanying drawing does not constitute any limit to the present invention
System.
The equivalent wiring diagram of power network is compensated during Fig. 1 singlephase earth faults；
Fig. 2 implementing procedure figures；
Using morphocline MMG identification failures occurs for Fig. 3 the moment；Dotted line is zero-sequence current waveform in figure, and point solid line is shape
Waveform after state gradient filtering.
Waveform and original waveform after Fig. 4 self-adaptive harmonics detections；(a) feeder line to be polluted by white noise and impulsive noise
Zero-sequence current waveform, (b) is to utilize the waveform after self-adaptive harmonics detection.
The fault transient state current (feeder line 1A phases earth fault) of Fig. 5 feeder lines 1 and 2；(a) it is the ABC phase transient currents of feeder line 1
Waveform, (b) is the ABC phase transient current waveforms of feeder line 2.
The autocorrelator trace of the transient state capacity current of the three-phase of Fig. 6 feeder lines 1；Feeder line 1A phase earth faults, (a) is the A of feeder line 1
The autocorrelator trace of phase transient state capacity current, (b) is the autocorrelator trace of the B phase transient state capacity currents of feeder line 1, and (c) is feeder line 1
C phase transient state capacity currents autocorrelator trace.
The autocorrelator trace of the transient state capacity current of the three-phase of Fig. 7 feeder lines 2.(a) it is the A phase transient state capacity currents of feeder line 1
Autocorrelator trace, (b) is the autocorrelator trace of the B phase transient state capacity currents of feeder line 1, and (c) is electric for the C phase transient state capacitive of feeder line 1
The autocorrelator trace of stream.
Embodiment
The present invention is described in detail by way of examples below in conjunction with the accompanying drawings.
Technical scheme, introduces morphological filter, system conditions pre-identification, based on feeder line faults itself
The Fault Locating Method of information, so as to solve the limitation and shortcoming of existing scheme presence, realization may be directly applied to FTU intelligence
The distributed feeder line one-phase ground protection of energy terminal.
This method is the distributed feeder line one-phase ground protection of realization, it is necessary to using following handling process：
Step 1: using zero-sequence current as starting element, when the zero-sequence current I0 of feeder line is more than setting current Iset,
Record current time is fault moment, and starting protection algorithm simultaneously records the first two cycle of fault moment and fault moment on feeder line
The phase current (including A, B, C three-phase) and zero-sequence current of four cycles afterwards.
Step 2: choosing each half period before and after fault moment, a cycle zero sequence current signal is terraced by grayscale morphologic altogether
Filter filtering processing is spent, the zero-sequence current after filtering process occurs when being that accurate failure occurs at the time of first pulse
Carve.The grayscale morphologic gradient filter G usedgrad(f) it is：
G (x) is structural element in above formula, and f (x) is pending primary signal,Expression utilizes structural element
G (x) does opening operation to f (x), and (f Θ g) (x) represents to do closed operation to f (x) using structural element g (x).Using incremental structural elements
Element：G=[0.05 0.1 0.6].
Step 3: on the basis of the moment occurs for the accurate failure obtained by step 2, phase current event is asked for according to lower formula
Hinder component Δ ipWith zero-sequence current fault component Δ i0；The faulted phase current occurred by asking for failure after the moment subtracts failure
Occur the load phase current before the moment and obtain phase current fault component Δ ip；Occurs the failure zero sequence after the moment by asking for failure
Electric current subtracts failure and occurs the uneven zero-sequence current acquisition zero-sequence current fault component Δ i before the moment0；
Δ i=iAfterwards-iBefore
I in formulaAfterwardsFor the fault current after failure, iBeforeFor the load current before failure.Then filtered out using bandstop filter
Steady-state component in the fault component of phase current and zero-sequence current, obtains phase current transients fault compoment Δ ip.trAnd zero-sequence current
Transients fault compoment Δ i0.tr。
Step 4: choosing phase current transients fault compoment Δ ip.trWith zero-sequence current transients fault compoment Δ i0.trMiddle failure
Occur 2 cycle data after the moment, noise suppression preprocessing is filtered using self-adaptive harmonics detection device.The adaptive shape used
State wave filter y (x) is：
Y (x)=α1(x)Oc(f(x))+α2(x)Co(f(x))
α in formula1(x), α2(x) it is weight coefficient, weight coefficient is tried to achieve using RLS (least square method) adaptive iteration, f (x) is
Pending primary signal, the structural element used is incremental structural element：G=[0.05 0.1 0.6], Oc (f (x)) represent profit
Form opening and closing operation is made to f (x) of structural element g, (f (x) represents to be f (x) form make and break computing using structural element g Co.
Step 5: using cubic spline wavelet phase current transients fault compoment Δ i pretreated to filtering and noise reductionp.trEnter
Four layers of wavelet decomposition of row, respectively obtain energy of A, B, C three-phase current transients fault compoment on 16 sub-bandsAskWithSelection
WithMiddle maximum is corresponding to be used as failure phase.
Step 6: using cubic spline wavelet zero-sequence current transients fault compoment Δ i pretreated to filtering and noise reduction0.tr
Four layers of wavelet decomposition are carried out, constantly will letter its essence is the conjugate quadrature mirror wave filter group for letting the signal go through one group high low pass combination
Number it is divided into different frequency ranges.Following formula is recycled to seek zero-sequence current transients fault compoment Δ i respectively0.trIn four layers of wavelet decomposition
The obtained energy on 16 sub-bands.(4,0) energy on frequency band is Δ i0.trDecaying DC component energy
(El.d), the energy sum on remaining each frequency band is Δ i0.trFree oscillation component energy (Ec.os)
In formulaFor wavelet decomposition (4, the k) coefficient under sub-band, k=0,1 ..., 15.
N is (4, wavelet coefficient sequence sequence number k) obtained under sub-band.
Seek El.dAnd Ec.osRatioWhen singlephase earth fault occurs for feeder line, the zero-sequence current transient state of generation
Fault component Δ i0.trInclude transient inductance electric current (i.e. decaying DC component El.d) and (the i.e. free damping point of transient state capacitance current
Measure Ec.os), and fault angle is when being 0 degree neighbouring, El.d>Ec.os, therefore when can obtain criterion η ＞ 1, judge that single-phase earthing event occurs for feeder line
Barrier, failure is mutually grounded protection act.The situation of η≤1 enters back into step 7 and does further differentiation.
Step 7: each 16 frequency band energies for A, B, C the three-phase current transients fault compoment tried to achieve according to step 5AskCorresponding A, B, C phase transient state capacity current gross energy when i takes A, B, CHere it is mutually A phases that failure, which might as well be assumed, then failure phase transient state capacity current gross energy isNon-faulting phase average transient state capacity current gross energyAsk failure phase and non-faulting phase energy
Amount compares ηp
Work as ηp＞ KeWhen, judge that singlephase earth fault occurs for feeder line, failure is mutually grounded protection act；Work as ηp≤KeWhen, then enter
Enter step 8 to determine whether.KeFor safety coefficient, 1.5 are taken here.
Step 8: on except its outer sub-bands of (4,0) frequency band, to feeder line three-phase current transients fault compoment Δ ip.tr's
Waveform --- wavelet coefficient carries out correlation analysis, first obtains autocorrelation estimation as autocorrelation analysis to each phase current transients fault compoment
Sequence, then seeks the cross-correlation coefficient of failure phase and the autocorrelation estimation sequence of non-faulting phase current transients fault compoment, together respectively
Step 7 might as well assume that failure is mutually A phases, then can obtain the cross-correlation coefficient on 15 sub-bandsJ=1,
... 15, seek the average of cross-correlation coefficientWithAverage again
WhenWhen judge that singlephase earth fault occurs for feeder line, failure is mutually grounded protection act；WhenWhen judge feeder line do not have
There is generation singlephase earth fault.Verify and analyze by a large amount of emulation experiments, KMRecommendation takes 0.7.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than the present invention is protected
The limitation of scope, although being explained in detail with reference to preferred embodiment to the present invention, one of ordinary skill in the art should manage
Solution, technical scheme can be modified or equivalent substitution, without departing from technical solution of the present invention essence and
Scope.
Claims (4)
1. a kind of distributed feeder automation new protective method applied to FTU, it is characterised in that comprise the following steps：
Step 1: when the zero-sequence current I0 of feeder line is more than setting current Iset, record current time is fault moment, record feedback
On line after the first two cycle of fault moment and fault moment four cycles phase current and zero-sequence current；
Step 2: choosing each half period before and after fault moment, a cycle zero sequence current signal is filtered by grayscale morphologic gradient altogether
Zero-sequence current after ripple device filtering process, filtering process occurs being that the moment occurs for accurate failure at the time of first pulse；
Step 3: on the basis of the moment occurs for the accurate failure obtained by step 2, occurring the event after the moment by asking for failure
Barrier phase current subtracts failure and occurs the load phase current acquisition phase current fault component △ i before the momentp；By asking for failure
Failure zero-sequence current after moment subtracts failure and occurs the uneven zero-sequence current acquisition zero-sequence current fault component △ before the moment
i0；Then the steady-state component in the fault component of the steady-state component and zero-sequence current in phase current is filtered out using bandstop filter,
Obtain phase current transients fault compoment △ ip.trWith zero-sequence current transients fault compoment △ i0.tr；
Step 4: choosing phase current transients fault compoment △ ip.trWith zero-sequence current transients fault compoment △ i0.trMiddle failure occurs
2 cycle data after moment, noise suppression preprocessing is filtered using self-adaptive harmonics detection device；
Step 5: using cubic spline wavelet phase current transients fault compoment △ i pretreated to filtering and noise reductionp.trCarry out four
Layer wavelet decomposition, respectively obtains energy of A, B, C three-phase current transients fault compoment on 16 sub-bandsAskWithSelection
WithMiddle maximum is corresponding to be used as failure phase；
Step 6: using cubic spline wavelet zero-sequence current transients fault compoment △ i pretreated to filtering and noise reduction0.trCarry out
Four layers of wavelet decomposition, seek the energy on 16 sub-bands, wherein the energy on (4,0) frequency band is zero-sequence current transient fault point
Measure △ i0.trDecaying DC component ENERGY El.d, the energy sum on remaining each frequency band is zero-sequence current transient fault point
Measure △ i0.trFree oscillation component ENERGY Ec.os；
Seek El.dAnd Ec.osRatioη>When 1, judge that singlephase earth fault occurs for feeder line, failure phase ground protection is moved
Make；The situation of η≤1 enters back into step 7 and does further differentiation；
Step 7: the energy on each 16 sub-bands for A, B, C the three-phase current transients fault compoment tried to achieve according to step 5AskCorresponding A, B, C phase transient state capacity current gross energy when i takes A, B, CIt is E that failure phase transient state capacity current gross energy is mutually determined according to failurefWith non-faulting phase average transient state
Capacity current gross energy Work as ηp>KeWhen, judge that singlephase earth fault occurs for feeder line, failure phase ground protection is moved
Make；Work as ηp≤KeWhen, enter back into step 8 and determine whether, KeFor safety coefficient；
Step 8: on except its outer sub-bands of (4,0) frequency band, to feeder line three-phase current transients fault compoment △ ip.trWaveform-
Wavelet coefficient carries out correlation analysis, first obtains autocorrelation estimation sequence as autocorrelation analysis to each phase current transients fault compoment,
Then the cross correlation of failure phase and the autocorrelation estimation sequence of other two non-faulting phase current transients fault compoments is sought respectively
Number, asks for failure phase and the cross-correlation coefficient of the autocorrelation estimation sequence of other two non-faulting phase current transients fault compoments
Average valueWhenWhen judge that singlephase earth fault occurs for feeder line, failure is mutually grounded protection act；WhenWhen sentence
Determine feeder line and do not occur singlephase earth fault.
2. a kind of distributed feeder automation new protective method applied to FTU according to claim 1, its feature exists
In self-adaptive harmonics detection device is in described step four：
Y (x)=α1(x)Oc(f(x))+α2(x)Co(f(x))
α in formula1(x), α2(x) it is weight coefficient, f (x) is pending primary signal, and the structural element used is incremental structural element：
G=[0.05 0.1 0.6], Oc (f (x)) represent to be f (x) form opening and closing operation, Co (f (x)) expressions using structural element g
Form make and break computing is done to f (x) using structural element g.
3. a kind of distributed feeder automation new protective method applied to FTU according to claim 1, its feature exists
In described grayscale morphologic gradient filter is：
Ggrad(f)=(f ⊕ g) (x)-(f Θ g) (x)
Wherein, g (x) is structural element, and f (x) is pending primary signal, and (f ⊕ g) (x) is represented using structural element g (x) to f
(x) opening operation is done, (f Θ g) (x) represents to do closed operation to f (x) using structural element g (x), using incremental structural element：G=
[0.05 0.1 0.6]。
4. a kind of distributed feeder automation new protective method applied to FTU according to claim 1, its feature exists
In described KeTake 1~2；KMTake 0.5-1.
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| CN110380378A (en) * | 2019-06-12 | 2019-10-25 | 积成电子股份有限公司 | Distributed 10KV power distribution network monitoring and protection system and guard method |
| CN110380378B (en) * | 2019-06-12 | 2022-03-08 | 积成电子股份有限公司 | Measurement and control protection method for distributed 10KV power distribution network |
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