CN106841913A - Distribution line failure distance-finding method - Google Patents

Distribution line failure distance-finding method Download PDF

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Publication number
CN106841913A
CN106841913A CN201710025385.0A CN201710025385A CN106841913A CN 106841913 A CN106841913 A CN 106841913A CN 201710025385 A CN201710025385 A CN 201710025385A CN 106841913 A CN106841913 A CN 106841913A
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traveling wave
reclosing
combined floodgate
distribution line
wave
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CN106841913B (en
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施慎行
雷傲宇
董新洲
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Tsinghua University
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Tsinghua University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Locating Faults (AREA)

Abstract

The present invention proposes a kind of fault distance-finding method of distribution line, wherein, the fault distance-finding method of the distribution line includes：Step 102, if distribution line is normal, in breaker closing, gathers and records the combined floodgate traveling wave of breaker generation from closing moment；Step 104, if the distribution line occurs permanent fault, in reclosing again after the circuit breaker trip, gathers and records the reclosing traveling wave of breaker generation from Reclosing Instant；Step 106, according to the combined floodgate traveling wave and the reclosing traveling wave, it is determined that coinciding with failure superposition traveling wave；Step 108, according to the trouble point back wave and the Reclosing Instant coincided with failure superposition traveling wave, calculates the trouble point distance of the distribution line.By technical scheme, failure can be quickly and accurately positioned when distribution network line occurs permanent fault, realize single-ended accurate fault location.

Description

Distribution line failure distance-finding method
Technical field
The present invention relates to technical field of power systems, in particular to a kind of fault distance-finding method of power circuit.
Background technology
At present, because distribution net work structure is complicated, branch is numerous, there is cable-transmission line in some areas, and Distribution automation covering level is limited, and most area still only has the single-ended measuring condition of transformer station or electric substation, therefore accurate It is determined that position failure is always a great problem in power distribution network.
In existing Fault Location for Distribution Network method, main faulty steady-state quantity method, fault transient amount method, injection method.Therefore Barrier steady-state quantity method is exactly mainly impedance method, and the voltage x current measured during using failure tries to achieve the impedance of fault loop, it is adaptable to point Branch less, the feeder line of simple structure, but be not suitable for multiple-limb or cable-aerial line mixing feeder line.Fault transient amount method is main It is exactly traveling wave method, the transient state travelling wave produced using failure carries out fault localization, can be divided into single-ended method and both-end method.Single-ended method faces Subject matter be that transient state travelling wave frequently can occur catadioptric, it is necessary to screen this one by one in branch node and joint line node The back wave of a little nodes, identification trouble point back wave will be extremely difficult；Both-end method needs all only with initial transient traveling wave Branches end installs equipment, cannot accomplish in practice；Additionally, also have using initial line mould ripple traveling wave and initial zero line ripple time The method that difference is found range, but zero line ripple communication process dispersion is serious, how to demarcate due in and determines zero line ripple ripple Speed will be main bugbear.Injection method is to inject distinctive signal come the method found range to system after the system failure, mainly has S to inject Method, port-fault diagnosis, plus letter transfer function method and single-ended injection traveling wave method, the subject matter of injection method is to need to install additional specially With signal source and auxiliary detection device, but cost of investment is high.
Therefore, how when distribution network line occurs permanent fault, failure is quickly and accurately positioned, and avoid detection The cost of investment of failure is too high as problem demanding prompt solution.
The content of the invention
The present invention is based on above mentioned problem, it is proposed that a kind of new single end distance measurement technical scheme, in distribution line During generation permanent fault, failure is quickly and accurately positioned.
In view of this, the present invention proposes a kind of single-ended traveling wave fault location method of distribution line, including：Step 102, If distribution line is normal, in breaker closing, the combined floodgate row of breaker generation from closing moment is gathered and recorded Ripple；Step 104, if the distribution line occurs permanent fault, in reclosing again after the circuit breaker trip, collection is simultaneously Record the reclosing traveling wave of breaker generation from Reclosing Instant；Step 106, according to the combined floodgate traveling wave and described heavy Combined floodgate traveling wave, it is determined that coinciding with failure superposition traveling wave；Step 108, according to the trouble point coincided with failure superposition traveling wave Back wave and the Reclosing Instant, calculate the trouble point distance of the distribution line.
In the technical scheme, when breaker carries out reclosing in normal combined floodgate and when there is permanent fault, Suo Youkui The structure and load of line and its branch are constant, the influence that failure superposition traveling wave only reacts fault branch are coincided with, from transient state travelling wave Angle, then be only reaction fault branch node to the catadioptric of ripple, the influence of other branches or joint line node is not reacted, Therefore, according to coincide with failure superposition traveling wave can recognize trouble point back wave, in conjunction with the combined floodgate row since closing moment Ripple can accurately determine trouble point distance.In addition, carrying out trouble point range finding by coinciding with failure superposition traveling wave, can eliminate The interference that branch node and joint line node are caused in feeder line, so that accurately and rapidly localization of faults distance.In addition, this Ranging scheme need not install injection device additional, be adapted to the distribution system of single-ended measuring condition, not by the shadow of neutral ground form Ring, can also especially be found range when feeder line has multipoint line or joint line situation, be widely used, and detection event The cost of investment of barrier is than relatively low.
In the above-mentioned technical solutions, it is preferable that step 106 is specifically included：Respectively to the combined floodgate traveling wave and the coincidence Lock traveling wave is normalized；The reclosing traveling wave after the combined floodgate traveling wave after normalization and normalization is entered by below equation Row is calculated, to determine that the failure that coincides with is superimposed traveling wave,
Wherein,Failure superposition traveling wave is coincided with described in representing,The reclosing traveling wave after the normalization is represented, Represent the combined floodgate traveling wave after the normalization.
In the technical scheme, by being normalized to combined floodgate traveling wave and reclosing traveling wave respectively, recycling is returned Reclosing traveling wave and combined floodgate traveling wave after one change treatment are calculated and coincide with failure superposition traveling wave, and this coincides with failure superposition traveling wave can To eliminate interference of the joint line node to transient state travelling wave, so as to realize the accurate measurement to trouble point distance.
In any of the above-described technical scheme, it is preferable that described the combined floodgate traveling wave and the reclosing traveling wave are entered respectively Row normalized, specifically includes：Wavelet transformation is carried out to the combined floodgate traveling wave and the reclosing traveling wave respectively, to determine State the first modulus maximum of combined floodgate traveling wave and the first modulus maximum of the reclosing traveling wave；According to below equation, respectively to institute State combined floodgate traveling wave and the reclosing traveling wave be normalized,
Wherein, YnRepresent the combined floodgate traveling wave, MnRepresent the first modulus maximum of the combined floodgate traveling wave, YfRepresent described heavy Combined floodgate traveling wave, MfRepresent the first modulus maximum of the reclosing traveling wave.
In the technical scheme, because combined floodgate traveling wave reclosing angle corresponding with failure amount is different, different amplitudes are produced Reclosing ripple, therefore, carry out wavelet transformation to combined floodgate traveling wave and reclosing traveling wave respectively, obtain the modulus maxima after wavelet transformation Value, after de-noising, it is determined that the first modulus maximum of combined floodgate traveling wave and reclosing traveling wave, goes further according to the first modulus maximum to closing a floodgate Ripple and reclosing traveling wave are normalized, and the failure that coincides with that faults branch road is capable of to calculate is superimposed traveling wave.
In any of the above-described technical scheme, it is preferable that by below equation to the combined floodgate traveling wave and the reclosing row Ripple carries out wavelet transformation：
Wherein, f (n) represents the combined floodgate traveling wave or the reclosing traveling wave,Represent approaching for jth yardstick Component,It is the Wavelet Component of jth yardstick, ((k2 represents filter parameter to h for k1 and g；And by below equation Calculate modulus maximum：
Wherein,The modulus maximum of the wavelet transformation of jth yardstick is represented,Represent the in current layer The Wavelet Component of the jth yardstick of k point datas.
In the technical scheme, wavelet transformation is carried out by above formula, can reduced to the trouble point in distribution line Positioning error so that ensure trouble point range finding accuracy.
In any of the above-described technical scheme, it is preferable that step 108 is specifically included：The distribution is calculated according to below equation The trouble point distance of circuit,
Wherein, X represents the trouble point distance of the distribution line, and t3 represents the moment of the trouble point back wave, t2 tables Show the Reclosing Instant, V represents traveling wave speed.
By technical scheme, the distance of generation permanent fault in distribution line is calculated, with further true Determine the position of trouble point, can thus be quickly and accurately positioned failure, accelerate troubleshooting and service restoration speed, reduce and have a power failure The loss for bringing, and can avoid detecting that the cost of investment of failure is too high.
Brief description of the drawings
Fig. 1 shows the schematic flow sheet of the fault distance-finding method of distribution line according to an embodiment of the invention；
Fig. 2 shows the schematic diagram of distribution line model according to an embodiment of the invention；
Fig. 3 shows the structural representation of the feeder line of distribution line model according to an embodiment of the invention；
Fig. 4 shows the tower structure schematic diagram of distribution line model according to an embodiment of the invention；
Fig. 5 shows the traveling wave of the reclosing of the emulation range finding of distribution line model according to an embodiment of the invention The schematic diagram of waveform；
Fig. 6 shows the row after the normalization of the emulation range finding of distribution line model according to an embodiment of the invention The schematic diagram of waveform；
Fig. 7 shows the weight during emulation range finding load variations of distribution line model according to an embodiment of the invention The schematic diagram of traveling-wave waveform is superimposed together in permanent fault.
Specific embodiment
It is below in conjunction with the accompanying drawings and specific real in order to the above objects, features and advantages of the present invention can be more clearly understood that Mode is applied to be further described in detail the present invention.It should be noted that in the case where not conflicting, the implementation of the application Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description in order to fully understand the present invention, but, the present invention may be used also Implemented with being different from other modes described here using other, therefore, protection scope of the present invention is not by described below Specific embodiment limitation.
Fig. 1 shows the schematic flow sheet of the fault distance-finding method of distribution line according to an embodiment of the invention.
As shown in figure 1, the fault distance-finding method of distribution line according to an embodiment of the invention, including：
Step 102, if distribution line is normal, in breaker closing, gather and record the breaker from close a floodgate when The combined floodgate traveling wave for producing is carved.
Step 104, if there is permanent fault in the distribution line, in reclosing again after the circuit breaker trip, Gather and record the reclosing traveling wave of breaker generation from Reclosing Instant.
Wherein, combined floodgate traveling wave and reclosing traveling wave can be current traveling wave, or voltage traveling wave.Closing moment can be with T1 is designated as, Reclosing Instant can be designated as t2.
Step 106, according to the combined floodgate traveling wave and the reclosing traveling wave, it is determined that coinciding with failure superposition traveling wave.
Step 108, according to the trouble point back wave and the Reclosing Instant coincided with failure superposition traveling wave, meter Calculate the trouble point distance of the distribution line.
In the technical scheme, when breaker carries out reclosing in normal combined floodgate and when there is permanent fault, Suo Youkui The structure and load of line and its branch are constant, the influence that failure superposition traveling wave only reacts fault branch are coincided with, from transient state travelling wave Angle, then be only reaction fault branch node to the catadioptric of ripple, the influence of other branches or joint line node is not reacted, Therefore, according to coincide with failure superposition traveling wave can recognize trouble point back wave, in conjunction with the combined floodgate row since closing moment Ripple can accurately determine trouble point distance.In addition, carrying out trouble point range finding by coinciding with failure superposition traveling wave, can eliminate The interference that branch node and joint line node are caused in feeder line, so that accurately and rapidly localization of faults distance.In addition, this Ranging scheme need not install injection device additional, be adapted to the distribution system of single-ended measuring condition, not by the shadow of neutral ground form Ring, can also especially be found range when feeder line has multipoint line or joint line situation, be widely used, and detection event The cost of investment of barrier is than relatively low.
In the above-mentioned technical solutions, it is preferable that step 106 is specifically included：Respectively to the combined floodgate traveling wave and the coincidence Lock traveling wave is normalized；The reclosing traveling wave after the combined floodgate traveling wave after normalization and normalization is entered by below equation Row is calculated, to determine that the failure that coincides with is superimposed traveling wave,
Wherein,Failure superposition traveling wave is coincided with described in representing,The reclosing traveling wave after the normalization is represented, Represent the combined floodgate traveling wave after the normalization.
In the technical scheme, by being normalized to combined floodgate traveling wave and reclosing traveling wave respectively, recycling is returned Reclosing traveling wave and combined floodgate traveling wave after one change treatment are calculated and coincide with failure superposition traveling wave, and this coincides with failure superposition traveling wave can To eliminate interference of the joint line node to transient state travelling wave, so as to realize the accurate measurement to trouble point distance.
In any of the above-described technical scheme, it is preferable that described the combined floodgate traveling wave and the reclosing traveling wave are entered respectively Row normalized, specifically includes：Wavelet transformation is carried out to the combined floodgate traveling wave and the reclosing traveling wave respectively, to determine State the first modulus maximum of combined floodgate traveling wave and the first modulus maximum of the reclosing traveling wave；According to below equation, respectively to institute State combined floodgate traveling wave and the reclosing traveling wave be normalized,
Wherein, YnRepresent the combined floodgate traveling wave, MnRepresent the first modulus maximum of the combined floodgate traveling wave, YfRepresent described heavy Combined floodgate traveling wave, MfRepresent the first modulus maximum of the reclosing traveling wave.
In the technical scheme, because combined floodgate traveling wave reclosing angle corresponding with failure amount is different, different amplitudes are produced Reclosing ripple, therefore, carry out wavelet transformation to combined floodgate traveling wave and reclosing traveling wave respectively, obtain the modulus maxima after wavelet transformation Value, after de-noising, it is determined that the first modulus maximum of combined floodgate traveling wave and reclosing traveling wave, goes further according to the first modulus maximum to closing a floodgate Ripple and reclosing traveling wave are normalized, and the failure that coincides with that faults branch road is capable of to calculate is superimposed traveling wave.
In addition, combined floodgate traveling wave when to normal operation is normalized with reclosing traveling wave when there is permanent fault After treatment, will according to the Mintrop wave head momentWithAlignment, the selection of time window size travels to fault wire with traveling wave from bus The time that road end most long returns again to determines, so as to avoid the interference of subsequently unrelated wave head, time window size is determined according to the following formula：
Wherein lmaxIt is the maximum length of faulty line, v is traveling wave speed.
In any of the above-described technical scheme, it is preferable that by below equation to the combined floodgate traveling wave and the reclosing row Ripple carries out wavelet transformation：
Wherein, f (n) represents the combined floodgate traveling wave or the reclosing traveling wave,Represent approaching for jth yardstick Component,It is the Wavelet Component of jth yardstick, ((k2 represents filter parameter to h for k1 and g；And by below equation Calculate modulus maximum：
Wherein,The modulus maximum of the wavelet transformation of jth yardstick is represented,Represent the in current layer The Wavelet Component of the jth yardstick of k point datas.
In the technical scheme, wavelet transformation is carried out by above formula, can reduced to the trouble point in distribution line Positioning error so that ensure trouble point range finding accuracy.
This programme chooses the derived function of the three subcenter B-spline functions commonly used in transient fault travelling wave analysis as small echo letter Number, the Mallat algorithms of corresponding wavelet transformation are realized by above formula.
Because the Wavelet Modulus Maxima of low yardstick is vulnerable to high frequency noise effect, and the Wavelet Modulus Maxima of high yardstick is corresponding Frequency band is relatively low, it is impossible to embody the high-frequency characteristic of transient state travelling wave, therefore this programme selecting scale j=2 treatment.Certainly, we Case can also select other yardsticks (for example, j=1,3,4) to be processed.
In any of the above-described technical scheme, it is preferable that step 108 is specifically included：The distribution is calculated according to below equation The trouble point distance of circuit,
Wherein, X represents the trouble point distance of the distribution line, and t3 represents the moment of the trouble point back wave, t2 tables Show the Reclosing Instant, V represents traveling wave speed.
Also can be with decoupling balanced circuit during analysis of high frequency transient signal although distribution line not coordinated transposition Matrix is decoupled, such as triumphant human relations Bel phase-model transformation matrix, and traditional modulus concept can continue on for analyzing transient state travelling wave.
In order to verify the correctness of technical solution of the present invention, while assessing range accuracy, carried out greatly using ATP-EMTP The simulation study of amount.Emulation to this programme below is described in detail.
Analogue system totally 8 returns back out line, circuit model using the 10kV typical case's radial distribution networks models shown in Fig. 2, bus It is as shown in table 1 with length.
Table 1
Circuit label Circuit model Line length (km)
L1 LGJ-120/20 21.16
L2 LGJ-120/20 26.37
L3 LGJ-95/15 2.44
L4 LGJ-95/15 17.95
L5 LGJ-70/10 5.43
L6 LGJ-70/10 7.95
L7 LGJ-120/20 8.80
L8 LGJ-120/20 14.06
It is emulation range finding circuit with feeder line L1, has 3 branches on circuit, the same backbone of branch's line style, branch location is such as Shown in Fig. 3.
Circuit is maximum using can accurately portray the Jmarti models of frequency dependent character, tower structure as shown in figure 4, wherein Sag is 2 meters, and ground resistivity is 100 Ω/km, in tower structure the phase line of B, C two of three-phase circuit apart from 9 meters of ground, At a distance of 2.9 meters between the phase line of B, C two, A phase lines are leaned on apart from 11.5 meters of bottom surface positioned at 1.1 meters apart from B, C two-phase central lines of track Nearly C phase lines side.
Using isolated neutral mode, record reclosing normal amount of first being closed a floodgate before circuit occurs permanent fault, so Consider B, C two-phase line short on backbone L1 at 8km afterwards, combined floodgate angle ensures that B phase amplitudes are larger, and time window is according to master Main line L1 maximum lengths are calculated as 0.189ms.Combined floodgate traveling wave and generation permanent fault when getting the normal operation of B phase voltages When the alignment of reclosing traveling wave after waveform and the waveform after Wavelet Modulus Maxima and normalization as shown in figure 5, wherein dotted line What is irised out is traveling wave Mintrop wave head, in the figure of original waveform, traveling wave of being closed a floodgate when top curve is for normal operation, and lower curve is hair Reclosing traveling wave during raw permanent fault.Combined floodgate traveling wave, generation are permanent during the normal operation being illustrated in figure 6 after normalization Reclosing traveling wave and the waveform for coinciding with failure superposition traveling wave during failure, wherein, top curve is folded to coincide with failure in figure Plus the waveform of traveling wave, intermediate curve is the waveform of reclosing traveling wave when there is permanent fault, and lower curve is normal operation When combined floodgate traveling wave waveform.By Fig. 7 it can be seen that before failure superposition traveling wave trouble point back wave Mintrop wave head is coincided with, normally transporting During row all there are other wave heads in combined floodgate traveling wave and reclosing traveling wave when there is permanent fault, this other point exactly before trouble point What Zhi Jiedian or other shorter feeder terminal nodes were caused.
It is calculated using wavelet modulus maxima and coincides with the trouble point back wave due in that failure is superimposed traveling wave, With reference to Reclosing Instant, fault distance can be calculated for 8.223km.
The emulation of diverse location different faults type is carried out to the 10kV typical case's radial distribution networks models shown in Fig. 2, is imitated True result is as shown in table 2.
Table 2
Simulation result in table 2 indicates the validity of the distance-finding method of this programme proposition, the range error of simulation process No more than 1km.
Interference of the joint line node to transient state travelling wave can be eliminated using failure superposition traveling wave is coincided with, for blend The inconsistent problem of velocity of wave in road, can use the normalized thought of velocity of wave, and it is trolley line that cable is converted according to velocity of wave.Assuming that Traveling wave speed is v in trolley line, and traveling wave speed is u in cable, is the cable of L for length, according to velocity of wave conversion to trolley line On length be Lv/u, so as to joint line is equivalent into homogeneous circuit, joint line is converted back after range finding again.
Assuming that two sections of 4.12km of trunk are the underground single-core cable in urban district in feeder line L1, cable center line mould traveling wave speed is 122.17m/us, trolley line center line mould traveling wave speed is 299.02m/us, so cable can convert making somebody a mere figurehead for 10.08km Line.If there is B, C two-phase line short permanent fault on feeder line backbone L1 at three sections of 3km of trunk, range measurement is 18.84km, converts back the range measurement of joint line for 12.88km, and error is 0.28km, therefore can efficiently locate failure Position.
Technical scheme is described in detail above in association with accompanying drawing, by technical scheme proposed by the present invention, proposes Using failure superposition traveling wave is coincided with come fault inspecting back wave, to calculate trouble point distance, and then to permanent fault point position Put and positioned, it is not necessary to install injection device additional, do not influenceed by neutral ground form, be adapted to the distribution of single-ended measuring condition System, especially can also be found range when feeder line has multipoint line or joint line situation, be widely used, but also can be with Avoid detecting that the cost of investment of failure is too high.
In the present invention, term " first ", " second " are only used for the purpose for describing, and it is not intended that indicating or implying phase To importance；Term " multiple " represents two or more.For the ordinary skill in the art, can be according to tool Body situation understands above-mentioned term concrete meaning in the present invention.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair Change, equivalent, improvement etc., should be included within the scope of the present invention.

Claims (5)

1. a kind of fault distance-finding method of distribution line, it is characterised in that including：
Step 102, if distribution line is normal, in breaker closing, gathers and records the breaker from closing moment The combined floodgate traveling wave of generation；
Step 104, if there is permanent fault in the distribution line, in reclosing again after the circuit breaker trip, collection And record the reclosing traveling wave of breaker generation from Reclosing Instant；
Step 106, according to the combined floodgate traveling wave and the reclosing traveling wave, it is determined that coinciding with failure superposition traveling wave；
Step 108, according to the trouble point back wave and the Reclosing Instant coincided with failure superposition traveling wave, calculates The trouble point distance of the distribution line.
2. the fault distance-finding method of distribution line according to claim 1, it is characterised in that step 106 is specifically included：
The combined floodgate traveling wave and the reclosing traveling wave are normalized respectively；
The reclosing traveling wave after the combined floodgate traveling wave after normalization and normalization is calculated by below equation, it is described to determine Failure superposition traveling wave is coincided with,
Y s ‾ = Y f ‾ - Y n ‾ ,
Wherein,Failure superposition traveling wave is coincided with described in representing,The reclosing traveling wave after the normalization is represented,Represent Combined floodgate traveling wave after the normalization.
3. the fault distance-finding method of distribution line according to claim 2, it is characterised in that described respectively to the combined floodgate Traveling wave and the reclosing traveling wave are normalized, and specifically include：
Wavelet transformation is carried out to the combined floodgate traveling wave and the reclosing traveling wave respectively, to determine the first mould of the combined floodgate traveling wave The first modulus maximum of maximum and the reclosing traveling wave；
According to below equation, the combined floodgate traveling wave and the reclosing traveling wave are normalized respectively,
Y n ‾ = Y n M n , Y f ‾ = Y f M f ,
Wherein, YnRepresent the combined floodgate traveling wave, MnRepresent the first modulus maximum of the combined floodgate traveling wave, YfRepresent the reclosing Traveling wave, MfRepresent the first modulus maximum of the reclosing traveling wave.
4. the fault distance-finding method of distribution line according to claim 3, it is characterised in that by below equation to described Combined floodgate traveling wave and the reclosing traveling wave carry out wavelet transformation：
V 2 j f ( n ) = Σ k 1 h ( k 1 ) × V 2 j - 1 f ( n - 2 j - 1 × k 1 ) W 2 j f ( n ) = 1 η j × Σ k 2 g ( k 2 ) × V 2 j - 1 f ( n - 2 j - 1 × k 2 ) ,
Wherein, f (n) represents the combined floodgate traveling wave or the reclosing traveling wave,The approximation component of jth yardstick is represented,It is the Wavelet Component of jth yardstick, h (k1) and g (k2) represent filter parameter；And
Modulus maximum is calculated by below equation：
Wherein,The modulus maximum of the wavelet transformation of jth yardstick is represented,Represent the kth points in current layer According to jth yardstick Wavelet Component.
5. the fault distance-finding method of distribution line according to any one of claim 1 to 4, it is characterised in that step 108 Specifically include：
The trouble point distance of the distribution line is calculated according to below equation,
X = ( t 3 - t 2 ) × V 2 ,
Wherein, X represents the trouble point distance of the distribution line, and t3 represents the moment of the trouble point back wave, and t2 represents institute Reclosing Instant is stated, V represents traveling wave speed.
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CN110456227A (en) * 2019-08-22 2019-11-15 清华大学 A kind of Single Terminal Traveling Wave Fault Location method of distribution line
CN110456228A (en) * 2019-08-22 2019-11-15 清华大学 A kind of fault distance-finding method of transmission line of electricity
CN110456229A (en) * 2019-08-22 2019-11-15 清华大学 A kind of Single Terminal Traveling Wave Fault Location device of distribution line
CN110456226A (en) * 2019-08-22 2019-11-15 清华大学 A kind of fault localization system of transmission line of electricity
CN112782532A (en) * 2020-10-19 2021-05-11 国网辽宁省电力有限公司 Power distribution network fault location method based on traveling wave signal generated by circuit breaker closing
JP2021081400A (en) * 2019-11-23 2021-05-27 清華大学Ｔｓｉｎｇｈｕａ Ｕｎｉｖｅｒｓｉｔｙ Line selection method of one-phase ground fault of distribution line and storage medium capable of performing computer-reading
CN113109668A (en) * 2021-04-12 2021-07-13 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
CN113447756A (en) * 2021-05-24 2021-09-28 南方电网科学研究院有限责任公司 Fault positioning method, device, equipment and medium for power distribution network line
CN113866553A (en) * 2021-08-24 2021-12-31 武汉华瑞伏安电力科技有限公司 Distributed fault double-end traveling wave positioning method independent of synchronous clock
CN114285009A (en) * 2021-12-14 2022-04-05 国网江苏省电力有限公司常州供电分公司 Active voltage arc extinction method based on neutral point injection current
CN114371332A (en) * 2022-03-22 2022-04-19 智联新能电力科技有限公司 Space magnetic field sensor and 10kV distribution line traveling wave positioning device and method

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