CN109188210A - A kind of urban electric power cable Two-terminal Fault Location method based on VMD-Hilbert transformation - Google Patents
A kind of urban electric power cable Two-terminal Fault Location method based on VMD-Hilbert transformation Download PDFInfo
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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
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Abstract
The invention discloses a kind of urban electric power cable Two-terminal Fault Location method based on VMD-Hilbert transformation, the fault distance-finding methods are as follows: the synchronous measuring apparatus by the way that cable ends are arranged in detects the initial wave head of failed row swash mould；The time-frequency icon standing wave head arrival time converted using VMD-Hilbert；The wave head through failure point reflection is screened using modulus maximum polarity；Fault point distance is derived by using wave head arrival time and known power cable line length.VMD-Hilbert is converted signal analysis method and both-end TRAVELING WAVE FAULT LOCATION connected applications to power cable line by the present invention.Line mould signal, the fault localization formula used of decaying weaker in measurement communication process is only needed not to be influenced by velocity of wave simultaneously.Range error caused by avoiding because of the uncertain measurement with its zero _exit of velocity of wave in power cable.There is good engineering practice value in power cable line.
Description
Technical field
The present invention relates to the urban electric power cable Two-terminal Fault Location methods at fault traveling wave moment arrival time.
Background technique
In the construction of urban distribution network, power cable replaces overhead line gradually at trend, compared with overhead line, has without ground
Upper space, the advantages such as power supply reliability is high, electric shock possibility is small, particularly suitable for urban electricity supply.Electric power in urban distribution network
There is cable run distance not grow, and the characteristics of more electric power distributions for being used to fix two places.But underground power cable inconvenience is examined
It repairs, once breaking down, needs basis to measure fault distance and remove failure in time, avoid influencing line security stable operation.
Currently, travelling wave ranging on overhead transmission line more application, but in power cable, velocity of wave is difficult to determine, zero mould passes
Broadcast characteristic it is difficult to predict.If be directly used in city cable with the signal analysis method and ranging formula of traditional travelling wave ranging,
Range error is larger.Therefore, research selects the urban electric power of more preferably signal processing method, design unrelated velocity of wave and zero _exit
Cable fault localization method is very necessary.
Summary of the invention
In order to realize the quick and precisely positioning of current urban electric power cable fault, the purpose of the present invention is to propose to one kind to be based on
The urban electric power cable Two-terminal Fault Location method of VMD-Hilbert transformation.
To achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of city cable Two-terminal Fault Location method based on VMD-Hilbert transformation, includes the following steps:
(1) cable head and end measurement point is respectively indicated with head end M point and end N point, F point indicates fault point；Electric power electricity
After cable line failure, head end M point and end N point primary current travelling wave signal are extracted respectively, phase moding then is carried out to it
It changes, obtains original line mould current failure travelling wave signal, be denoted as respectivelyWherein subscript M indicates head end M point, subscript N table
Show that end N point, subscript (1) indicate line mould；
(2) the original line mould current traveling wave signal that head end M point and end N point measure is obtainedUtilize variation mould
It is series of discrete modal components that state, which decomposes (VMD) for signal decomposition,；
(3) Hilbert transformation is carried out to first modal components obtained after the signal decomposition of both ends respectively, is obtained corresponding
T/F relational graph, the time that the high frequency demarcated in time-frequency figure sports the fault initial wave head arrival both ends M, N are denoted as respectively
(4) judged by the polarity examination of each modulus maximum in variation mode decomposition (VMD) afterwards first modal components
The wavefront for reaching the both ends M, N is reflected through fault point, is found out the wave head corresponding high frequency mutation and is occurred the moment and is denoted as respectively
(5) obtained wave head arrival time is substituted into following equation (1), (2)
Wherein, L indicates half wavelength line overall length；
(6) D that will be obtainedMF1、DMF2Substitute into the distance D that following equation (3) calculate accurate fault distance endpoint MMF。
The invention has the advantages that:
VMD-Hilbert is converted signal analysis method and both-end TRAVELING WAVE FAULT LOCATION connected applications to electric power by the present invention
Cable run.Only need the line mould signal for decaying weaker in measurement communication process, fault localization formula used not by velocity of wave shadow simultaneously
It rings.Range error caused by avoiding because of the uncertain measurement with its zero _exit of velocity of wave in power cable.In power cable line
In have good engineering practice value.
Detailed description of the invention
Fig. 1 is that city cable line fault emulates schematic diagram；
Fig. 2 is flow chart of the present invention.
Specific embodiment
The embodiment of the present invention is provided below with reference to attached drawing, and technical solution of the present invention is carried out into one by embodiment
Clear, the complete explanation of step.Obviously, the embodiment is only a part of the embodiments of the present invention, rather than whole implementation
Example.
As shown in Fig. 2, a kind of city cable Two-terminal Fault Location method based on VMD-Hilbert transformation, including it is as follows
Step:
(1) cable head and end measurement point is respectively indicated with head end M point and end N point, F point indicates fault point；Electric power electricity
After cable line failure, head end M point and end N point primary current travelling wave signal are extracted respectively, phase moding then is carried out to it
It changes, obtains original line mould current failure travelling wave signal, be denoted as respectivelyWherein subscript M indicates head end M point, subscript N table
Show that end N point, subscript (1) indicate line mould；
(2) the original line mould current traveling wave signal that head end M point and end N point measure is obtainedUtilize variation mould
It is series of discrete modal components that state, which decomposes (VMD) for signal decomposition,；
(3) Hilbert transformation is carried out to first modal components obtained after the signal decomposition of both ends respectively, is obtained corresponding
T/F relational graph, the time that the high frequency demarcated in time-frequency figure sports the fault initial wave head arrival both ends M, N are denoted as respectively
(4) judged by the polarity examination of each modulus maximum in variation mode decomposition (VMD) afterwards first modal components
The wavefront for reaching the both ends M, N is reflected through fault point, is found out the wave head corresponding high frequency mutation and is occurred the moment and is denoted as respectively
(5) obtained wave head arrival time is substituted into following equation (1), (2)
Wherein, L indicates half wavelength line overall length；
(6) D that will be obtainedMF1、DMF2Substitute into the distance D that following equation (3) calculate accurate fault distance endpoint MMF。
Various methods involved in the present invention are as follows:
1. the initial wave head recognition methods of line fault pressure-wire mould
After power cable line breaks down, the current traveling wave that fault point generates can reach both ends measurement point along route.
Signal decomposition is series of discrete modal components first with variation mode decomposition (VMD) by this method, is obtained to after signal decomposition
To first modal components carry out Hilbert transformation respectively, obtain corresponding T/F relational graph, demarcate in time-frequency figure
First high frequency sport fault initial wave head reach both ends time.
2. the method for line fault point reflection wave head
After being decomposed by VMD, n-th modulus maximum polarity in first modal components for the first time with first mould pole
Big value polarity is identical, then in the transformed time-frequency figure of Hilbert, as fault point is anti-at the time of the mutation of n-th high frequency is corresponding
Ejected wave head arrival time.
Simulating, verifying
In order to verify effectiveness of the invention and reliability, power cable line model is built on PSCAD/EMTDC, such as
Shown in Fig. 1.Using the circuit model for meeting practical line mould frequency dependent character, using three-core cable model, voltage class 6KV.Cause
It is the most common short trouble for single-phase grounding fault, accounts for about the 70% of total failare, so failure of the present invention is set as single
Phase ground short circuit failure.Route head end and end are equipped with current traveling wave measuring device, respectively in different fault distances, failure
Fault simulation emulation is carried out under the influence of resistance, payload size.According to context of methods, relevant parameter is calculated using MATLAB software
And fault distance.Fault localization error e is defined by the formula:
In above formula, XcFor the fault distance being calculated, XrFor physical fault distance, L=10km is total line length.Therefore
It is as shown in table 1 below to hinder location Calculation result.As space is limited, in table 1 fault distance be distance line head end M point distance.Under
In table 1, S is bearing power, and RFL is physical fault distance, RfFor fault resstance.
Fault location calculated result in the case of 1 different faults of table
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of urban electric power cable Two-terminal Fault Location method based on VMD-Hilbert transformation, which is characterized in that the failure
Distance measuring method are as follows: the synchronous measuring apparatus by the way that cable ends are arranged in detects the initial wave head of failed row swash mould；Utilize VMD-
The time-frequency icon standing wave head arrival time that Hilbert is converted；The wave through failure point reflection is screened using modulus maximum polarity
Head；Fault point distance is derived by using wave head arrival time and known power cable line length.
2. a kind of urban electric power cable Two-terminal Fault Location side based on VMD-Hilbert transformation according to claim 1
Method, it is characterised in that: cable head and end measurement point is respectively indicated with head end M point and end N point, F point indicates fault point；Electric power
After cable run breaks down, head end M point and end N point primary current travelling wave signal are extracted respectively, phase mould then is carried out to it
Transformation obtains original line mould current failure travelling wave signal, is denoted as respectivelyWherein subscript M indicates head end M point, subscript N
Indicate that end N point, subscript (1) indicate line mould.
3. a kind of urban electric power cable Two-terminal Fault Location side based on VMD-Hilbert transformation according to claim 2
Method, it is characterised in that:
Obtain the original line mould current traveling wave signal that head end M point and end N point measureIt will using variation mode decomposition
Signal decomposition is series of discrete modal components；
Contain a large amount of high-frequency signals in first modal components, first modal components obtained after the signal decomposition of both ends are distinguished
Hilbert transformation is carried out, corresponding T/F relational graph is obtained, the high frequency demarcated in time-frequency figure sports failure primary wave
The time that head reaches the both ends M, N is denoted as respectively
4. a kind of urban electric power cable Two-terminal Fault Location side based on VMD-Hilbert transformation according to claim 3
Method, it is characterised in that: by after variation mode decomposition in first modal components each modulus maximum polarity examination judge through
Fault point reflection reaches the wavefront at the both ends M, N, finds out the wave head corresponding high frequency mutation and occurs the moment and is denoted as respectively
5. a kind of urban electric power cable Two-terminal Fault Location side based on VMD-Hilbert transformation according to claim 4
Method, it is characterised in that:
Obtained wave head arrival time is substituted into following equation (1), (2)
Wherein, L indicates half wavelength line overall length.
6. a kind of urban electric power cable Two-terminal Fault Location side based on VMD-Hilbert transformation according to claim 5
Method, it is characterised in that:
The D that will be obtainedMF1、DMF2Substitute into the distance D that following equation (3) calculate accurate fault distance endpoint MMF；
7. a kind of urban electric power cable Two-terminal Fault Location side based on VMD-Hilbert transformation according to claim 3
Method, it is characterised in that: cable fault dotted line mould initial wave head arrival time obtains by the following method: to original line mould signal into
After row variation mode decomposition, Hilbert transformation is carried out to first modal components and demarcates first height in obtained time-frequency figure
The frequency mutation moment is initial wave head arrival time.
8. a kind of urban electric power cable Two-terminal Fault Location side based on VMD-Hilbert transformation according to claim 4
Method, it is characterised in that: cable fault dotted line mould reflection wave head arrival time obtains by the following method: in first modal components
In n-th modulus maximum polarity it is identical as first modulus maximum polarity for the first time, then in the transformed time-frequency figure of Hilbert
In, wave head arrival time is reflected in as fault point at the time of the mutation of n-th high frequency is corresponding.
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|---|---|---|---|---|
| CN109901016A (en) * | 2019-03-13 | 2019-06-18 | 清华四川能源互联网研究院 | A kind of both-end distance measuring method eliminating velocity of wave and influencing |
| CN110514967A (en) * | 2019-10-12 | 2019-11-29 | 国网江苏省电力有限公司徐州供电分公司 | A kind of Fault Locating Method based on NARNN model prediction wavefront arrival time |
| CN110542831A (en) * | 2019-08-30 | 2019-12-06 | 国网河南省电力公司电力科学研究院 | Fault traveling wave detection method based on variational modal decomposition and S transformation |
| CN111503527A (en) * | 2020-04-22 | 2020-08-07 | 重庆邮电大学 | Fluid pipeline leakage positioning method based on self-adaptive multivariate variational modal decomposition |
| CN111948493A (en) * | 2020-08-21 | 2020-11-17 | 兰州理工大学 | MMC-HVDC direct current transmission line fault positioning method |
| CN112305378A (en) * | 2020-10-21 | 2021-02-02 | 中国科学院声学研究所南海研究站 | Photoelectric composite submarine cable fault distance measurement system and fault distance measurement method |
| 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 |
| CN113447765A (en) * | 2021-08-13 | 2021-09-28 | 南通通明集团有限公司 | Method for determining fault position of power transmission and distribution cable |
| CN113740660A (en) * | 2021-07-01 | 2021-12-03 | 国网河北省电力有限公司雄安新区供电公司 | Line fault positioning method and device for low-voltage direct-current system at user side |
| CN114019325A (en) * | 2021-11-02 | 2022-02-08 | 国网江苏省电力有限公司常州供电分公司 | Cable double-end positioning method and device |
| CN114779002A (en) * | 2022-03-29 | 2022-07-22 | 南方电网电力科技股份有限公司 | Method, device and equipment for positioning fault point of power transmission line and storage medium |
| CN117310392A (en) * | 2023-11-24 | 2023-12-29 | 科大智能电气技术有限公司 | Double-end traveling wave ranging method and readable medium suitable for power distribution network fault location |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109901016A (en) * | 2019-03-13 | 2019-06-18 | 清华四川能源互联网研究院 | A kind of both-end distance measuring method eliminating velocity of wave and influencing |
| CN109901016B (en) * | 2019-03-13 | 2020-11-20 | 清华四川能源互联网研究院 | Double-end ranging method for eliminating wave velocity influence |
| CN110542831A (en) * | 2019-08-30 | 2019-12-06 | 国网河南省电力公司电力科学研究院 | Fault traveling wave detection method based on variational modal decomposition and S transformation |
| CN110514967A (en) * | 2019-10-12 | 2019-11-29 | 国网江苏省电力有限公司徐州供电分公司 | A kind of Fault Locating Method based on NARNN model prediction wavefront arrival time |
| CN110514967B (en) * | 2019-10-12 | 2021-05-18 | 国网江苏省电力有限公司徐州供电分公司 | Fault positioning method for predicting arrival time of traveling wave head based on NARNN model |
| CN111503527A (en) * | 2020-04-22 | 2020-08-07 | 重庆邮电大学 | Fluid pipeline leakage positioning method based on self-adaptive multivariate variational modal decomposition |
| CN111948493A (en) * | 2020-08-21 | 2020-11-17 | 兰州理工大学 | MMC-HVDC direct current transmission line fault positioning method |
| CN112305378A (en) * | 2020-10-21 | 2021-02-02 | 中国科学院声学研究所南海研究站 | Photoelectric composite submarine cable fault distance measurement system and fault distance measurement method |
| 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 |
| 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 |
| CN113740660A (en) * | 2021-07-01 | 2021-12-03 | 国网河北省电力有限公司雄安新区供电公司 | Line fault positioning method and device for low-voltage direct-current system at user side |
| CN113447765A (en) * | 2021-08-13 | 2021-09-28 | 南通通明集团有限公司 | Method for determining fault position of power transmission and distribution cable |
| CN114019325A (en) * | 2021-11-02 | 2022-02-08 | 国网江苏省电力有限公司常州供电分公司 | Cable double-end positioning method and device |
| CN114019325B (en) * | 2021-11-02 | 2023-11-14 | 国网江苏省电力有限公司常州供电分公司 | Cable double-end positioning method and device |
| CN114779002A (en) * | 2022-03-29 | 2022-07-22 | 南方电网电力科技股份有限公司 | Method, device and equipment for positioning fault point of power transmission line and storage medium |
| CN114779002B (en) * | 2022-03-29 | 2024-04-02 | 南方电网电力科技股份有限公司 | Power transmission line fault point positioning method, device, equipment and storage medium |
| CN117310392A (en) * | 2023-11-24 | 2023-12-29 | 科大智能电气技术有限公司 | Double-end traveling wave ranging method and readable medium suitable for power distribution network fault location |
| CN117310392B (en) * | 2023-11-24 | 2024-03-22 | 科大智能电气技术有限公司 | Double-end traveling wave ranging method and readable medium suitable for power distribution network fault location |
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