CN106291261A - The localization method of series-parallel connection one-phase earthing failure in electric distribution network - Google Patents
The localization method of series-parallel connection one-phase earthing failure in electric distribution network Download PDFInfo
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- CN106291261A CN106291261A CN201610946129.0A CN201610946129A CN106291261A CN 106291261 A CN106291261 A CN 106291261A CN 201610946129 A CN201610946129 A CN 201610946129A CN 106291261 A CN106291261 A CN 106291261A
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
- G01R31/088—Aspects of digital computing
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- 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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Abstract
The invention discloses the localization method of series-parallel connection one-phase earthing failure in electric distribution network, comprise the following steps: step one, the three-phase row ripple produced at substation bus bar end fault inspecting；Step 2, the three-phase row ripple obtained is carried out phase-model transformation obtains zero mould and line mode voltage；Step 3, bus end zero mould obtained and line line ripple are carried out wavelet packet band decomposition and the reconstruct of more than Wavelet Denoising Method and two-layer, and using bus end to each line end all as a paths, set up the corresponding relation between modulus time difference and the fault distance on all paths；Step 4, utilize the modulus time difference that obtains and the corresponding relation of fault distance and obtain the distance between trouble point and bus end according to the neutral net on each path；The fault distance that step 5, utilization obtain judges fault section.The present invention is easy to position fast, accurately fault section when Distribution Network Frame ceases to be busy, the detection of cable series-parallel connection line single phase grounding failure.
Description
Technical field
The present invention relates to distribution network failure location technology, the specifically localization method of series-parallel connection one-phase earthing failure in electric distribution network.
Background technology
Singlephase earth fault is a kind of fault that in power distribution network, occurrence probability is the highest, for improving power supply reliability, the 6 of China
～35kV medium voltage distribution network typically uses the small current neutral grounding method of operation, this method of operation include isolated neutral system, in
Property point compensated distribution network and neutral point through high resistant (ratio of Zero sequence synthetic reactance reactance comprehensive with positive sequence be more than or equal to 4)
Earthed system.Owing to power distribution network uses the isolated neutral method of operation, after there is singlephase earth fault, line voltage remains in that
Symmetry, the operation of three phase electric equipment can be continued to run with about 2 hours, in this phase by code regulation by fault without impact, system
Between operator on duty should find earth fault in time and fix a breakdown.
For fast searching earth fault, current people usually use power distribution network row ripple positioning mode to carry out fault point extremely
The distance of bus end.But, power distribution network row ripple positioning mode is not the most applicable on all of circuit, makes somebody a mere figurehead for labyrinth
Line, cable series-parallel connection circuit, its aerial line is different with the row wave parameter of cable, fault traveling wave amplitude attenuation on two kinds of circuits,
Wave velocity variation characteristic and frequency dispersion degree there are differences, and the natural impedance discontinuity point at aerial line, cable conversion adds row ripple
Catadioptric complexity in the line, reflection wave head is difficult to identification, caused by row ripple dispersion phenomenon in series-parallel connection circuit
Wave distortion can produce interference to wave head due in, according to power distribution network row ripple positioning mode locating rack ceases to be busy, cable series-parallel connection line
The singlephase earth fault on road, it may appear that bigger deviation.How locating rack ceases to be busy, the singlephase earth fault of cable series-parallel connection circuit,
This becomes current people's question of common concern, but, the most do not solve the documents and materials of relevant art problem, have no yet and appoint
The report what is relevant.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of series-parallel connection one-phase earthing failure in electric distribution network
Localization method, it is easy to position fast, accurately when Distribution Network Frame ceases to be busy, the detection of cable series-parallel connection line single phase grounding failure
Fault section.
The present invention solves the problems referred to above and is achieved through the following technical solutions: determining of series-parallel connection one-phase earthing failure in electric distribution network
Method for position, comprises the following steps:
Step one, the three-phase row ripple produced at substation bus bar end fault inspecting；
Step 2, the three-phase row ripple obtaining step one carry out phase-model transformation and obtain zero mould and line mode voltage；
Step 3, bus end zero mould obtained in step 2 and line line ripple are carried out the little of more than Wavelet Denoising Method and two-layer
Ripple bag band decomposition and reconstruct, and using bus end to each line end all as a paths, set up the mould on all paths
Corresponding relation between amount time difference and fault distance；
Step 4, utilize modulus time difference that step 3 obtains and the corresponding relation of fault distance and according on each path
Neutral net obtains the distance between trouble point and bus end；
Step 5, the fault distance that obtains in step 4 is utilized to judge fault section.The present invention is to bus end zero mould and line
Line ripple carries out wavelet packet band decomposition and the reconstruct of more than Wavelet Denoising Method and two-layer, can obtain the frequency band letter that frequency dispersion degree is relatively low
Number.The present invention carries out primary wave leader by wavelet transformation to the traveling wave modulus of wavelet package reconstruction and determines, so that it is determined that zero _exit
With the moment that Aerial mode component arrives bus end.
Further, the formula that the three-phase row ripple in described step 2 detected bus end carries out phase-model transformation is as follows:
Wherein, u0It is zero mode voltage, u1For line mode voltage, Ua、UbAnd UcThe three-phase voltage collected for bus end.
Further, the Wavelet Denoising Method in described step 3 uses and becomes threshold values function, and threshold values function is:
In formula,For the wavelet coefficient for reconstruction signal, wj,kFor the jth coefficient of wavelet decomposition kth layer,For the threshold values of wavelet decomposition kth layer,For general threshold values, σ=median (| wj,1|)/
0.6745 is noise criteria variance, and N is that signal is counted.The Wavelet Denoising Method of the present invention uses and becomes threshold values function, has good going
Make an uproar performance.
Further, described step 4 acquisition trouble point is as follows with the formula of the spacing of bus end:
Wherein, v0It is zero mould detection wave velocity, v1Detecting wave velocity for line mould, △ t is modulus time difference, s be trouble point with
Distance between bus end.
Further, described step 5 judging, fault section specifically includes following steps: judge whether two with
The fault distance of the neutral net matching of upper pathway is consistent, if then trouble point is positioned at its common portion, if it is not, the most each path
The fault distance of neutral net is the most different, uses each fault distance divided by corresponding line mould wave velocity, obtains line line ripple mother
Come and go the required time between line end and trouble point, whether there is trouble point echo by checking line line ripple in these moment
Head carrys out the true and false of failure judgement distance, finally determines fault section.
When the present invention applies, neutral net matching traveling wave modulus time difference is utilized to obtain event with the corresponding relation of fault distance
Barrier distance, judges faulty section by verifying whether the fault dotted line mould reflection wave head corresponding to each matching fault distance exists
Section.The present invention obtains more accurately wave head by the method for wavelet package transforms bed-by-bed analysis and demarcates moment and modulus time difference
With the matching of the corresponding relation of fault distance, beneficially neutral net, and row ripple frequency dispersion can be reduced in series-parallel connection circuit to wave head mark
Fixed impact.
In sum, the method have the advantages that (1) present invention is for based on traveling wave modulus speed difference and nerve net
The localization method of the series-parallel connection one-phase earthing failure in electric distribution network of network, principle is simple, the most only needs single-end electrical quantity, it is not necessary to
Time synchronized and extras, and be avoided that when the present invention applies carry out in series-parallel connection circuit complexity modulus wave velocity iteration,
The challenges such as calculating, it is easy to accomplish, it is simple to realize quickly location.
(2) present invention utilizes wavelet transformation to demarcate the wave head due in of zero mode voltage and line mode voltage, can promote this
The degree of accuracy of range finding during bright application.
(3) present invention utilizes wavelet package transforms decompose in the narrow-band of several non-overlapping copies by traveling wave modulus and choose
The suitably low frequency frequency band in the number of plies is reconstructed, and reduces the impact that in series-parallel connection circuit, wave head is demarcated by row ripple frequency dispersion, wave head
It is the most accurate to demarcate, and neutral net fitting effect is more preferable, can promote the present invention and position the degree of accuracy of fault section.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by the embodiment of the present invention, constitutes of the application
Point, it is not intended that the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of one specific embodiment of the present invention；
Fig. 2 is a kind of concrete series-parallel connection wire topologies figure built based on PSCAD/EMTDC；
Fig. 3 is the corresponding relation figure after series-parallel connection circuit ground floor WAVELET PACKET DECOMPOSITION shown in Fig. 2；
Fig. 4 is the corresponding relation figure after series-parallel connection circuit second layer WAVELET PACKET DECOMPOSITION shown in Fig. 2；
Fig. 5 is the corresponding relation figure after series-parallel connection circuit third layer WAVELET PACKET DECOMPOSITION shown in Fig. 2；
Fig. 6 is the corresponding relation figure after series-parallel connection circuit the 4th shown in Fig. 2 layer WAVELET PACKET DECOMPOSITION；
Fig. 7 is first reflection wave head checking situation schematic diagram of matching distance on each path of series-parallel connection circuit shown in Fig. 2.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, to this
Invention is described in further detail, and the exemplary embodiment of the present invention and explanation thereof are only used for explaining the present invention, do not make
For limitation of the invention.
As it is shown in figure 1, the localization method of series-parallel connection one-phase earthing failure in electric distribution network, the following steps including carrying out successively: step
Three-phase row ripple rapid 1, that produce at substation bus bar end fault inspecting；Step 2, to obtain three-phase row ripple carry out phase-model transformation
Obtain zero mould and line mode voltage；Step 3, bus end zero mould obtained and line line ripple are carried out more than Wavelet Denoising Method and two-layer
Wavelet packet band decomposition and reconstruct, and using bus end to each line end all as a paths, set up on all paths
Corresponding relation between modulus time difference and fault distance；The modulus time difference that step 4, utilization obtain is corresponding with fault distance
Relation also obtains the distance between trouble point and bus end according to the neutral net on each path；The fault that step 5, utilization obtain
Range estimation fault section.
In the specific implementation, the formula that the three-phase row ripple detecting bus end carries out phase-model transformation is as follows for the present invention:
Wherein, u0It is zero mode voltage, u1For line mode voltage, Ua、UbAnd UcThe three-phase voltage collected for bus end.
In the specific implementation, Wavelet Denoising Method uses and becomes threshold values function the present invention, and threshold values function is:
In formula,For the wavelet coefficient for reconstruction signal, wj,kFor the jth coefficient of wavelet decomposition kth layer,For the threshold values of wavelet decomposition kth layer,For general threshold values, σ=median (| wj,1|)/
0.6745 is noise criteria variance, and N is that signal is counted.
When the present invention applies, the modulus time difference obtained under the different WAVELET PACKET DECOMPOSITION number of plies of contrast, different wavelet basis and event
The corresponding relation of barrier distance, chooses the optimal corresponding relation of wherein monotonicity and trains the neutral net of every paths (during modulus
Between difference with fault distance respectively as the input of neutral net and output), and with the WAVELET PACKET DECOMPOSITION number of plies of this corresponding relation and
Wavelet basis is as the setting of subsequent treatment fault traveling wave.Utilize the relation of the fault distance on every paths and modulus time difference
(GA is genetic algorithm part, and BP is feedforward neural network, and the effect of GA is not to train GA-BP neutral net corresponding to each path
BP parameter is optimized so that BP matching mean square error is finally reached requirement), by the functional relationship of matching input with output
Avoid calculating wave velocity.
The present invention in the specific implementation, obtains trouble point as follows with the formula of the spacing of bus end:
Wherein, v0It is zero mould detection wave velocity, v1Detecting wave velocity for line mould, △ t is modulus time difference, s be trouble point with
Distance between bus end.
The present invention is after fault occurs, and the fault traveling wave receiving measurement end carries out band decomposition, reconstruct and wavelet transformation
Obtaining modulus time difference, wherein the WAVELET PACKET DECOMPOSITION number of plies, wavelet basis etc. set all consistent with setting during training neutral net.
Present invention determine that fault section specifically includes following steps: judge whether two with the neutral net of upper pathway
The fault distance of matching is consistent, if then trouble point is positioned at its common portion, if it is not, the fault of the neutral net in the most each path away from
From the most different, use each fault distance divided by corresponding line mould wave velocity, obtain line line ripple between bus end and trouble point
Come and go the required time, whether there is trouble point reflection wave head by checking line line ripple in these moment and carry out failure judgement distance
The true and false, finally determine fault section.
Embodiment:
It is illustrated in figure 2 a kind of concrete aerial line, the cable series-parallel connection wire topologies built based on PSCAD/EMTDC,
It is specially 10kV series-parallel connection distribution network line model, and each branch length is as in figure 2 it is shown, arrange trouble point also with 0.1km for interval
Carry out singlephase earth fault emulation experiment, gather fault traveling wave measuring end A and carry out signal denoising and 4 layers of WAVELET PACKET DECOMPOSITION,
Reconstruct zero line ripple on first frequency band of each decomposition layer and line line ripple, the modulus time difference of the different number of plies of contrast and fault away from
From corresponding relation, as shown in Fig. 3～Fig. 6, corresponding relation after third layer WAVELET PACKET DECOMPOSITION is optimal as seen from the figure, then utilizes
The relation of third layer modulus time difference and fault distance trains the neutral net on four paths, and wherein A-B-C-D is path 1,
A-B-C-E is path 2, and A-B-F-G-H-I is path 3, and A-B-F-G-K is path 4.Optional position arranges single-phase connecing on the line
Earth fault point, such as the CE section at range measurement end 16km, carries out at the beginning of three layers of wavelet package transforms reconstruct and demarcate to fault traveling wave
Beginning wave head, inputs the neutral net on four paths by its modulus time difference, the fault distance obtained be respectively 14.532km,
15.786km, 18.409km, 14.015km, corresponding each path-line mould detection wave velocity is respectively v1=26.7083 ×
104km/s、v2=19.6655 × 104km/s, v3=27.9758 × 104km/s and v4=28.4145 × 104km/s, calculates
The checking time instant τ of reflection wave head1=109 μ s, τ2=163 μ s, τ3=131 μ s, τ4=98 μ s, the radius in checking interval is respectively
R1=1.50 μ s, r2=2.03 μ s, r3=1.43 μ s, r4=1.41 μ s.As it is shown in fig. 7, at the checking interval R2 internal memory in path 2
At wavelet conversion coefficient modulus maximum, and there is not trouble point in other paths, therefore there is not trouble point reflection in checking interval
The line mould wave head returned, then may determine that trouble point occurs on path 2, and fault distance is 15.786km.
Above-described detailed description of the invention, has been carried out the purpose of the present invention, technical scheme and beneficial effect further
Describe in detail, be it should be understood that the detailed description of the invention that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, all should comprise
Within protection scope of the present invention.
Claims (5)
1. the localization method of series-parallel connection one-phase earthing failure in electric distribution network, it is characterised in that comprise the following steps:
Step one, the three-phase row ripple produced at substation bus bar end fault inspecting；
Step 2, the three-phase row ripple obtaining step one carry out phase-model transformation and obtain zero mould and line mode voltage；
Step 3, bus end zero mould obtained in step 2 and line line ripple are carried out the wavelet packet of more than Wavelet Denoising Method and two-layer
Band decomposition and reconstruct, and using bus end to each line end all as a paths, when setting up the modulus on all paths
Between differ from fault distance between corresponding relation；
Step 4, utilize modulus time difference that step 3 obtains and the corresponding relation of fault distance and according to the nerve on each path
Distance between Network Capture trouble point and bus end；
Step 5, the fault distance that obtains in step 4 is utilized to judge fault section.
The localization method of series-parallel connection one-phase earthing failure in electric distribution network the most according to claim 1, it is characterised in that described step
The formula that the three-phase row ripple in two detected bus end carries out phase-model transformation is as follows:
Wherein, u0It is zero mode voltage, u1For line mode voltage, Ua、UbAnd UcThe three-phase voltage collected for bus end.
The localization method of series-parallel connection one-phase earthing failure in electric distribution network the most according to claim 1, it is characterised in that described step
Wavelet Denoising Method in three uses and becomes threshold values function, and threshold values function is:
In formula,For the wavelet coefficient for reconstruction signal, wj,kFor the jth coefficient of wavelet decomposition kth layer,For the threshold values of wavelet decomposition kth layer,For general threshold values, σ=median (| wj,1|)/
0.6745 is noise criteria variance, and N is that signal is counted.
The localization method of series-parallel connection one-phase earthing failure in electric distribution network the most according to claim 1, it is characterised in that described step
Four acquisition trouble points are as follows with the formula of the spacing of bus end:
Wherein, v0It is zero mould detection wave velocity, v1Detecting wave velocity for line mould, △ t is modulus time difference, and s is trouble point and bus
Distance between end.
5. according to the localization method of the series-parallel connection one-phase earthing failure in electric distribution network described in any one in Claims 1 to 4, its feature
It is, described step 5 judging, fault section specifically includes following steps: judge whether two with the nerve of upper pathway
The fault distance of network matching is consistent, if then trouble point is positioned at its common portion, if it is not, the event of the neutral net in the most each path
Barrier distance is the most different, uses each fault distance divided by corresponding line mould wave velocity, obtains line line ripple in bus end and trouble point
Between come and go the required time, whether there is trouble point reflection wave head by checking line line ripple in these moment and carry out failure judgement
The true and false of distance, finally determines fault section.
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| CN107219440A (en) * | 2017-04-11 | 2017-09-29 | 中国矿业大学 | The localization method of single-ended radiation type distribution network singlephase earth fault |
| CN107621591A (en) * | 2017-09-22 | 2018-01-23 | 中国矿业大学 | A kind of transmission line of electricity iteration distance-finding method based on zero mould traveling wave speed variation characteristic |
| CN108169626A (en) * | 2018-01-16 | 2018-06-15 | 国网冀北电力有限公司秦皇岛供电公司 | A kind of T-shaped power transmission line fault locating method and system |
| CN108693446A (en) * | 2018-05-25 | 2018-10-23 | 中国矿业大学 | A kind of Fault Locating Method of non-synchronous sampling power grid transient state travelling wave modulus time difference |
| CN108845233A (en) * | 2018-07-06 | 2018-11-20 | 四川大学 | Electric distribution network overhead wire single-phase earthing double-end monitor localization method |
| CN109284830A (en) * | 2018-11-27 | 2019-01-29 | 广东电网有限责任公司 | A kind of combination single-ended traveling wave fault location algorithm |
| CN109901014A (en) * | 2019-03-08 | 2019-06-18 | 西安交通大学 | The voltage waveform acquisition method and its monitoring system of power grid ground fault |
| CN111521909A (en) * | 2020-04-30 | 2020-08-11 | 云南电网有限责任公司红河供电局 | Complex-structure power grid fault single-terminal location method based on line zero-mode wave velocity difference |
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| CN112649756A (en) * | 2020-12-17 | 2021-04-13 | 华电山西能源有限公司新能源分公司 | Method, system, medium and equipment for single-phase earth fault location of collecting wire of wind power plant |
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| CN107219440A (en) * | 2017-04-11 | 2017-09-29 | 中国矿业大学 | The localization method of single-ended radiation type distribution network singlephase earth fault |
| CN107219440B (en) * | 2017-04-11 | 2018-11-27 | 中国矿业大学 | The localization method of single-ended radiation type distribution network singlephase earth fault |
| CN107621591B (en) * | 2017-09-22 | 2019-02-19 | 中国矿业大学 | A kind of transmission line of electricity iteration distance measuring method based on zero mould traveling wave speed variation characteristic |
| CN107621591A (en) * | 2017-09-22 | 2018-01-23 | 中国矿业大学 | A kind of transmission line of electricity iteration distance-finding method based on zero mould traveling wave speed variation characteristic |
| CN108169626A (en) * | 2018-01-16 | 2018-06-15 | 国网冀北电力有限公司秦皇岛供电公司 | A kind of T-shaped power transmission line fault locating method and system |
| CN108169626B (en) * | 2018-01-16 | 2021-05-14 | 国网冀北电力有限公司秦皇岛供电公司 | T-shaped power transmission line fault positioning method and system |
| CN108693446A (en) * | 2018-05-25 | 2018-10-23 | 中国矿业大学 | A kind of Fault Locating Method of non-synchronous sampling power grid transient state travelling wave modulus time difference |
| CN108845233A (en) * | 2018-07-06 | 2018-11-20 | 四川大学 | Electric distribution network overhead wire single-phase earthing double-end monitor localization method |
| CN109284830A (en) * | 2018-11-27 | 2019-01-29 | 广东电网有限责任公司 | A kind of combination single-ended traveling wave fault location algorithm |
| CN109901014A (en) * | 2019-03-08 | 2019-06-18 | 西安交通大学 | The voltage waveform acquisition method and its monitoring system of power grid ground fault |
| CN111537830A (en) * | 2020-03-26 | 2020-08-14 | 南方电网科学研究院有限责任公司 | Power distribution network fault diagnosis method based on cloud edge architecture and wavelet neural network |
| CN111521909A (en) * | 2020-04-30 | 2020-08-11 | 云南电网有限责任公司红河供电局 | Complex-structure power grid fault single-terminal location method based on line zero-mode wave velocity difference |
| CN111521909B (en) * | 2020-04-30 | 2022-07-05 | 云南电网有限责任公司红河供电局 | Complex-structure power grid fault single-terminal location method based on line zero-mode wave velocity difference |
| CN112649756A (en) * | 2020-12-17 | 2021-04-13 | 华电山西能源有限公司新能源分公司 | Method, system, medium and equipment for single-phase earth fault location of collecting wire of wind power plant |
| CN113092946A (en) * | 2021-04-20 | 2021-07-09 | 国网北京市电力公司 | Method and device for positioning ground fault of multi-branch overhead-cable mixed line of power distribution network |
| CN113985194A (en) * | 2021-09-28 | 2022-01-28 | 广西电网有限责任公司电力科学研究院 | Power distribution network fault positioning method based on stack self-encoder |
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