CN104459458B - A kind of circuit of specific short window integrated value of utilization orientation traveling wave, which closes a floodgate, arrives fault recognition method - Google Patents
A kind of circuit of specific short window integrated value of utilization orientation traveling wave, which closes a floodgate, arrives fault recognition method Download PDFInfo
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- CN104459458B CN104459458B CN201410467991.4A CN201410467991A CN104459458B CN 104459458 B CN104459458 B CN 104459458B CN 201410467991 A CN201410467991 A CN 201410467991A CN 104459458 B CN104459458 B CN 104459458B
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Abstract
Closed a floodgate the present invention relates to a kind of circuit of the specific short window integrated value of utilization orientation traveling wave and arrive fault recognition method, belong to Relay Protection Technology in Power System field.When singlephase earth fault occurs for transmission line of electricity, using single-pole reclosing, closing line mould current traveling wave and closing line mode voltage traveling wave the construction forward current traveling wave and reverse current traveling wave obtained using measuring end, asks for the absolute value of direct wave and backward-travelling wave, and calculate 2 τ after combined floodgate respectivelymin~4 τminWhen window in the ratio between the integrated value of forward and reverse traveling wave absolute value arrive Fault Identification criterion to build to close a floodgate.If the ratio between integrated value is less than the threshold value k of setting, it is judged to close a floodgate and arrives fault-free circuit；It is opposite to be judged to close a floodgate to failure if the ratio between integrated value is more than k.Simulating, verifying shows that this method is not influenceed by abort situation, transition resistance, the initial phase angle of failure, and energy reliable recognition is closed a floodgate to the situation of faulty line, it is to avoid circuit is by secondary pulse.
Description
Technical field
Closed a floodgate the present invention relates to a kind of circuit of the specific short window integrated value of utilization orientation traveling wave and arrive fault recognition method, belonged to
Relay Protection Technology in Power System field.
Background technology
Travelling waves analysis is the basis of travelling wave ranging and traveling-wave protection, is had to the travelling wave ranging for proposing new with guard method
Important directive function.Domestic well-known scholar is studied the characteristic of traveling wave, and proposes new row on this basis
Ripple ranging and protection philosophy.But these traveling wave specificity analysises and protection philosophy in normal working line mainly for breaking down
Situation, when carrying out closing operation, the situation for being unable to correct operation will occurs in these protections, therefore also needs to further research
Close a floodgate to the recognition methods of failure.Early stage carries out the identification of He Zhong Library circuit using polarity of traveling wave comparison expression direction protection,
Method is similar to a kind of simple travelling wave ranging, occur in that line end near fault is difficult to, forward and reverse traveling wave is non-
The polarity same problem that occurs in the case of symmetric fault and the problems such as do not account for breaker breakers asynchronous closing.
The content of the invention
The technical problem to be solved in the present invention is that the circuit for proposing a kind of short window integrated value of utilization orientation traveling wave closes a floodgate to event
Hinder recognition component method of discrimination, to improve the power supply reliability of single-pole reclosing circuit and the stability of system paired running.
The technical scheme is that：A kind of circuit of specific short window integrated value of utilization orientation traveling wave, which closes a floodgate, arrives Fault Identification
Method, when singlephase earth fault occurs for transmission line of electricity, using single-pole reclosing, the closing line mould electric current obtained using measuring end
Traveling wave and closing line mode voltage traveling wave construction forward current traveling wave and reverse current traveling wave, ask for direct wave and reverse row respectively
The absolute value of ripple, and calculate 2 τ after combined floodgatemin~4 τminWhen window in the ratio between the integrated value of forward and reverse traveling wave absolute value build conjunction
Lock is to Fault Identification criterion；If the ratio between integrated value is less than the threshold value k of setting, it is judged to close a floodgate and arrives fault-free circuit；If integration
The ratio between value is then judged to close a floodgate more than k arrives failure.
Concretely comprise the following steps：
(1) protected circuit occurs after singlephase earth fault, failure phase is disconnected, now by protected circuit measuring end M ends
The breaker of failure phase performs closing operation, and protected circuit other end N-terminal breaker is off, obtained by measuring end M
Three-phase current traveling wave and voltage traveling wave are obtained, three-phase voltage and three-phase current traveling wave are utilized respectively into formula (1), (2) carries out phase moding
Change, extract three line mode voltage component Δ uα、ΔuβWith Δ uγWith current component Δ iα、ΔiβWith Δ iγ：
In formula (1), Δ uA、ΔuBWith Δ uCΔ i in respectively three-phase voltage, formula (2)A、ΔiBWith Δ iCRespectively three-phase
Electric current；
(2) from Δ uα、Δuβ、ΔuγWith Δ iα、Δiβ、ΔiγThe middle line mode voltage Δ u for choosing the phase containing failuremWith line mould electricity
Flow Δ im, utilize (3), (4) formula construction forward current traveling waveWith reverse current traveling wave
In formula (3) and formula (4), n represents sampled point, subscript m=α or β or γ, represents the modulus chosen；
(3) characteristic quantity is extracted：Forward current traveling wave absolute value and reverse current traveling wave absolute value after closing a floodgate are calculated respectively, are obtained
ArriveWith
(4) 2 τ after closing a floodgate are calculated respectively using formula (5), (6)min~4 τmin(τminPerfect total track length most short for traveling wave
The time used is propagated once, herein τmin=lmin/ v) when window in forward current traveling wave absolute value and reverse current traveling wave it is absolute
The integrated value S of value+And S-：
T in formula (5) and (6)0=2 τmin；
(5) the ratio λ that forward and reverse current traveling wave absolute value is integrated is asked for according to formula (7)∑：
λ∑=S+/S- (7)
According to integration ratio λ∑Size carry out close a floodgate to failure differentiation：
If λ∑Less than the threshold value k of setting, then it is judged to close a floodgate and arrives fault-free circuit；
If λ∑More than or equal to k, then it is judged to close a floodgate and arrives failure.
Using PSCAD electromagnetic transient simulation softwares, a trouble point is set to carry out completely every Nkm along protected circuit MN
Traversal, the integration ratio λ obtained according to calculating∑The regularity of distribution, carries out adjusting value to threshold value k along the line.
The beneficial effects of the invention are as follows：This method uses the combined floodgate that direction traveling wave integrated value compares to Fault Identification element energy
Reliable recognition is closed a floodgate to the situation of faulty line, it is to avoid circuit improves the reliability of element identification, quick-action by secondary pulse
Property.This method is not influenceed by abort situation, transition resistance, the initial phase angle of failure.
Brief description of the drawings
Fig. 1 is the transmission line of electricity analogue system figure in embodiment 1,2,3；
Fig. 2 is completely emulation traversal gained λ∑Rule figure along the line；
Fig. 3 is the line mode voltage Δ u of the phase containing failure in embodiment 1mCurve；
Fig. 4 is the line mould electric current Δ i of the phase containing failure in embodiment 1mCurve；
Fig. 5 is forward current traveling wave and reverse current traveling wave curve in embodiment 1；
Fig. 6 is forward current traveling wave absolute value and reverse current traveling wave absolute value curve in embodiment 1；
Fig. 7 is the line mode voltage Δ u of the phase containing failure in embodiment 2mCurve；
Fig. 8 is the line mould electric current Δ i of the phase containing failure in embodiment 2mCurve；
Fig. 9 is forward current traveling wave and reverse current traveling wave curve in embodiment 2；
Figure 10 is forward current traveling wave absolute value and reverse current traveling wave absolute value curve in embodiment 2；
Figure 11 is the line mode voltage Δ u of the phase containing failure in embodiment 3mCurve；
Figure 12 is the line mould electric current Δ i of the phase containing failure in embodiment 3mCurve；
Figure 13 is forward current traveling wave and reverse current traveling wave curve in embodiment 3；
Figure 14 is forward current traveling wave absolute value and reverse current traveling wave absolute value curve in embodiment 3.
Embodiment
With reference to the accompanying drawings and detailed description, the invention will be further described.
Embodiment 1：500kV transmission line of electricity Simulation Models as shown in Figure 1, protected circuit is MN, line length
LPM=150km, LMN=150km, LNQ=220km, sample rate is 1MHz.If the A phases breaker of protected circuit N-terminal is in disconnected
Open state, performs closing operation, it is assumed that circuit MN fault-frees and away from M by the A phases breaker at protected circuit measuring end M ends
149km is held to occur AG metallic earthing failures, transition resistance is 0 Ω, initial 90 ° of phase angle.
Protected circuit occurs after singlephase earth fault, failure phase is disconnected, now by protected circuit measuring end M ends failure
The breaker of phase performs closing operation, and protected circuit other end N-terminal breaker is off.Circuit carrying capacity at closing is gathered to survey
Three-phase current traveling wave produced by holding M and three-phase voltage traveling wave.Three-phase voltage and three-phase current traveling wave are utilized respectively formula (1), (2)
Phase-model transformation is carried out, three line mode voltage component Δ u are extractedα、ΔuβWith Δ uγWith current component Δ iα、ΔiβWith Δ iγ：
In formula (1), Δ uA、ΔuBWith Δ uCΔ i in respectively three-phase voltage, formula (2)A、ΔiBWith Δ iCRespectively three-phase
Electric current；
From Δ uα、Δuβ、ΔuγWith Δ iα、Δiβ、ΔiγThe middle line mode voltage Δ u for choosing the phase containing failuremWith line mould electric current
Δim, failure is mutually A phases in this example, therefore m=ɑ, line mode voltage Δ uɑ、ΔiɑWaveform is as shown in Figure 3,4.By line mode voltage Δ
uɑ、ΔiɑSubstitute into (3), (4) formula construction forward current traveling waveWith reverse current traveling waveIts waveform is as shown in Figure 5.
Extract characteristic quantity：Forward current traveling wave absolute value and reverse current traveling wave absolute value after closing a floodgate are calculated, is obtained
WithAs shown in Figure 6.
Calculate 2 τ after combined floodgate respectively according to formula (5), (6)min~4 τminWhen window (1ms) interior forward current traveling wave absolute value and
The integrated value of reverse current traveling wave absolute value is S+=1634.9, S-=1364.
Using PSCAD electromagnetic transient simulation softwares, a trouble point is set to carry out completely every 1km along protected circuit MN
Traversal, the integration ratio λ obtained according to calculating∑The regularity of distribution, threshold value k is adjusted as 0.5 along the line.
By S+、S-Value substitute into formula (7) λ∑=S+/S-, calculate the ratio for obtaining forward and reverse current traveling wave absolute value integration
λ∑=S+/S-=1.20, due to λ∑More than threshold value 0.5, therefore it is judged as closing a floodgate to failure.
Embodiment 2：500kV transmission line of electricity Simulation Models as shown in Figure 1, protected circuit is MN, line length
LPM=150km, LMN=150km, LNQ=220km, sample rate is 1MHz.If the A phase breakers of N-terminal are off, by M
The A phases breaker at end performs closing operation, it is assumed that circuit MN fault-frees and occur BG metallic earthings away from M ends 60km therefore
Barrier, transition resistance is 10 Ω, initial 90 ° of phase angle.Gather circuit carrying capacity at closing and survey three-phase current traveling wave and three-phase voltage produced by the M of end
Traveling wave.Three-phase voltage and three-phase current traveling wave are subjected to phase-model transformation using formula (1), (2), three line mode voltage component Δs are extracted
uα、ΔuβWith Δ uγWith current component Δ iα、ΔiβWith Δ iγ, and choose the line mode voltage Δ u of the phase containing failuremWith line mould electric current Δ
imAs shown in Figure 7,8.Utilize (3), (4) formula construction forward current traveling waveWith reverse current traveling waveAs shown in Figure 9.Meter
Forward current traveling wave absolute value and reverse current traveling wave absolute value after closing a floodgate are calculated, is obtainedWithAs shown in Figure 10.According to
Formula (5), (6) calculate respectively close a floodgate after 1ms when window in forward current traveling wave absolute value and reverse current traveling wave absolute value integration
It is worth for S+=1241.1, S-=1286.7, then the ratio λ that forward and reverse current traveling wave absolute value is integrated∑=S+/S-=0.96, by
In λ∑More than 0.5, therefore it is judged as closing a floodgate to failure.
Embodiment 3：500kV transmission line of electricity Simulation Models as shown in Figure 1, protected circuit is MN, line length
LPM=150km, LMN=150km, LNQ=220km, sample rate is 1MHz.If the A phase breakers of N-terminal are off, by M
The A phases breaker at end performs closing operation, it is assumed that circuit MN fault-frees and occur CG metallic earthings away from M ends 90km therefore
Barrier, transition resistance is 10 Ω, initial 90 ° of phase angle.Gather circuit carrying capacity at closing and survey three-phase current traveling wave and three-phase voltage produced by the M of end
Traveling wave.Three-phase voltage and three-phase current traveling wave are subjected to phase-model transformation using formula (1), (2), three line mode voltage component Δs are extracted
uα、ΔuβWith Δ uγWith current component Δ iα、ΔiβWith Δ iγ, and choose the line mode voltage Δ u of the phase containing failuremWith line mould electric current Δ
imAs shown in Figure 11,12.Utilize (3), (4) formula construction forward current traveling waveWith reverse current traveling waveSuch as Figure 13 institutes
Show.Forward current traveling wave absolute value and reverse current traveling wave absolute value after closing a floodgate are calculated, is obtainedWithSuch as Figure 14 institutes
Show.According to formula (5), (6) respectively calculate combined floodgate after 1ms when window in forward current traveling wave absolute value and reverse current traveling wave absolute value
Integrated value be S+=181.0, S-=1083.4, then the ratio λ that forward and reverse current traveling wave absolute value is integrated∑=S+/S-=
0.1671, due to λ∑Less than 0.5, therefore it is judged as closing a floodgate to fault-free circuit.
The embodiment to the present invention is explained in detail above, but the present invention is not limited to above-mentioned embodiment party
Formula, in the knowledge that those of ordinary skill in the art possess, can also make on the premise of present inventive concept is not departed from
Go out various change.
Claims (1)
1. a kind of circuit of specific short window integrated value of utilization orientation traveling wave, which closes a floodgate, arrives fault recognition method, it is characterised in that：When defeated
When singlephase earth fault occurs for electric line, using single-pole reclosing, the closing line mould current traveling wave obtained using measuring end and conjunction
Brake cable mode voltage traveling wave constructs forward current traveling wave and reverse current traveling wave, and the absolute of direct wave and backward-travelling wave is asked for respectively
Value, and calculate 2 τ after combined floodgatemin~4 τmin, τminPropagated once time used in the most short total track length that perfects for traveling wave, when window
The ratio between integrated value of interior forward and reverse traveling wave absolute value arrives Fault Identification criterion to build to close a floodgate；If the ratio between integrated value is less than setting
Threshold value k, then be judged to close a floodgate arrive fault-free circuit；It is judged to close a floodgate if the ratio between integrated value is more than k and arrives failure；
Concretely comprise the following steps：
(1) protected circuit occurs after singlephase earth fault, failure phase is disconnected, now by protected circuit measuring end M ends failure
The breaker of phase performs closing operation, and protected circuit other end N-terminal breaker is off, and three are obtained by measuring end M
Phase current traveling wave and voltage traveling wave, are utilized respectively formula (1), (2) by three-phase voltage and three-phase current traveling wave and carry out phase-model transformation, carry
Take three line mode voltage component Δ uα、ΔuβWith Δ uγWith current component Δ iα、ΔiβWith Δ iγ：
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(2) from Δ uα、Δuβ、ΔuγWith Δ iα、Δiβ、ΔiγThe middle line mode voltage Δ u for choosing the phase containing failuremWith line mould electric current Δ
im, utilize (3), (4) formula construction forward current traveling waveWith reverse current traveling wave
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(4) 2 τ after closing a floodgate are calculated respectively using formula (5), (6)min~4 τminWhen window in forward current traveling wave absolute value and reversely electricity
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T in formula (5) and (6)0=2 τmin；
(5) the ratio λ that forward and reverse current traveling wave absolute value is integrated is asked for according to formula (7)∑：
λ∑=S+/S- (7)
According to integration ratio λ∑Size carry out close a floodgate to failure differentiation：
If λ∑Less than the threshold value k of setting, then it is judged to close a floodgate and arrives fault-free circuit；
If λ∑More than or equal to k, then it is judged to close a floodgate and arrives failure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410467991.4A CN104459458B (en) | 2015-01-09 | 2015-01-09 | A kind of circuit of specific short window integrated value of utilization orientation traveling wave, which closes a floodgate, arrives fault recognition method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410467991.4A CN104459458B (en) | 2015-01-09 | 2015-01-09 | A kind of circuit of specific short window integrated value of utilization orientation traveling wave, which closes a floodgate, arrives fault recognition method |
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| Publication Number | Publication Date |
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| CN104459458A CN104459458A (en) | 2015-03-25 |
| CN104459458B true CN104459458B (en) | 2017-09-12 |
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| CN105098740B (en) * | 2015-09-15 | 2017-12-22 | 昆明理工大学 | A kind of combined floodgate based on forward current traveling wave classified analysis on major constituents is to fault recognition method |
| CN105116295B (en) * | 2015-09-22 | 2018-05-25 | 昆明理工大学 | It is a kind of that overhead line fault distance-finding method is directly matched somebody with somebody based on the calibration of traveling wave mutation distance |
| CN105182186B (en) * | 2015-09-29 | 2019-01-04 | 昆明理工大学 | A kind of radiation network Fault branch identification method based on voltage's distribiuting along the line and traveling wave information all standing |
| CN105259473B (en) * | 2015-10-23 | 2018-05-11 | 清华大学 | The determination methods and judgment means of transmission line fault direction |
| CN109739215B (en) * | 2019-01-21 | 2021-05-04 | 济南大学 | Method for realizing fault initial angle control and automatic traversal in PSCAD |
| CN110133433B (en) * | 2019-03-27 | 2021-07-06 | 国网浙江省电力有限公司电力科学研究院 | Direct-current power distribution network fault disturbance identification method based on mutation integral product |
| CN110161375B (en) * | 2019-06-21 | 2021-07-09 | 国网山东省电力公司电力科学研究院 | High-voltage direct-current transmission line calculation model based on distributed resistance parameters |
| CN110221177B (en) * | 2019-06-28 | 2021-04-06 | 国网四川省电力公司电力科学研究院 | Method for identifying internal and external faults of inversion station area of high-voltage direct-current transmission system |
| CN113109668B (en) * | 2021-04-12 | 2022-12-20 | 国网陕西省电力公司西安供电公司 | Power distribution network asymmetric fault positioning method based on reclosing zero-mode traveling wave mutation |
| CN114113995B (en) * | 2021-10-29 | 2024-04-05 | 河南平高电气股份有限公司 | Method and system for detecting mechanical faults of isolating switch for GIS |
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| DE3812432A1 (en) * | 1988-04-14 | 1989-10-26 | Siemens Ag | Method and device for determining the fault location on an electrical line |
| CN101877479A (en) * | 2009-12-10 | 2010-11-03 | 贵州电力试验研究院 | Method for comparing and judging phase of single-pole adaptive reclosure of electric transmission line |
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