CN108362974A - The fault distance-finding method and device of power distribution network - Google Patents
The fault distance-finding method and device of power distribution network Download PDFInfo
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- CN108362974A CN108362974A CN201810106633.9A CN201810106633A CN108362974A CN 108362974 A CN108362974 A CN 108362974A CN 201810106633 A CN201810106633 A CN 201810106633A CN 108362974 A CN108362974 A CN 108362974A
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- fault
- power distribution
- signal
- singular point
- distribution network
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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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- 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 invention discloses a kind of fault distance-finding method of power distribution network and devices, wherein method includes：Detect fault-signal；Fault-signal is decomposed and is reconstructed, to obtain the natural mode of vibration IMF components after reconstructing；IMF components are decomposed, to extract the singular point of modulus maximum under the conditions of different faults；And the fault time of singular point is obtained according to the singular point of modulus maximum, and fault point distance is obtained according to fault time.This method rapidly and accurately can carry out fault localization to power distribution network, improve the accuracy and practicability of ranging, and simple easily realization.
Description
Technical field
The present invention relates to power transmission technology field, more particularly to the fault distance-finding method and device of a kind of power distribution network.
Background technology
In the related technology, mainly there are signal injection method and impedance method for the method for Fault Location for Distribution Network, wherein signal
Injection method be circuit input terminal inject a signal, with observe circuit have no signal output come decision circuitry it is whether normal,
And impedance method according to transmission line malfunction when the voltage, the Current calculation that measure be out of order impedance loop, realize fault localization.
However, the relevant technologies are not high to fault localization precision, the required precision of power distribution network is cannot be satisfied, and in power distribution network
When breaking down, it is difficult to rapidly and accurately measure fault point distance, power distribution network can not be effectively ensured and run with security and stability, it would be highly desirable to
It solves.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, an object of the present invention is to provide a kind of fault distance-finding method of power distribution network, there is process simply may be used
It leans on, operation is succinctly efficient, the high advantage of practicability.
It is another object of the present invention to propose a kind of fault location device of power distribution network.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes a kind of fault distance-finding method of power distribution network, including：
Detect fault-signal；The fault-signal is decomposed and reconstructed, to obtain IMF (the Intrinsic Mode after reconstructing
Function, natural mode of vibration) component；The IMF components are decomposed, to extract the strange of modulus maximum under the conditions of different faults
Dissimilarity；And the fault time of the singular point is obtained according to the singular point of the modulus maximum, and according to the fault time
Obtain fault point distance.
The fault distance-finding method of the power distribution network of the embodiment of the present invention can obtain different according to the IMF components of fault-signal
The singular point of modulus maximum under fault condition, to obtain fault point distance, improves the accuracy of ranging to obtain fault time
And practicability, and simple easily realization, it is not only more safe and reliable, and meet the requirement of economy and high efficiency, it is promoted and is used
Family usage experience.
Further, in an embodiment of the invention, the detection fault-signal, further comprises：Acquire failure record
The line signal of wave device record；The fault-signal is obtained according to the line signal of the record.
Further, in an embodiment of the invention, described that the IMF components are decomposed, further comprise：It is logical
Wavelet transformation is crossed to decompose the IMF components.
Further, in an embodiment of the invention, described described strange according to the acquisition of the singular point of the modulus maximum
The fault time of dissimilarity, further comprise：Obtain the first derivative of the singular point of the modulus maximum；According to the singular point
First derivative obtains the fault time.
Further, in an embodiment of the invention, described that fault point distance is obtained according to the fault time, into one
Step includes：The fault point distance is obtained by using both-end traveling wave method.
In order to achieve the above objectives, another aspect of the present invention embodiment proposes a kind of fault location device of power distribution network.
The fault localization system of the power distribution network of the embodiment of the present invention can obtain different according to the IMF components of fault-signal
The singular point of modulus maximum under fault condition, to obtain fault point distance, improves the accuracy of ranging to obtain fault time
And practicability, and simple easily realization, it is not only more safe and reliable, and meet the requirement of economy and high efficiency, it is promoted and is used
Family usage experience.
Further, in an embodiment of the invention, the detection module includes：Collecting unit, for acquiring failure
The line signal of oscillograph record；First acquisition unit, for obtaining the fault-signal according to the line signal of the record.
Further, in an embodiment of the invention, the extraction module is further used for through wavelet transformation to institute
IMF components are stated to be decomposed.
Further, in an embodiment of the invention, the range finder module includes：Second acquisition unit, for obtaining
The first derivative of the singular point of the modulus maximum；Third acquiring unit, for being obtained according to the first derivative of the singular point
The fault time.
Further, in an embodiment of the invention, the range finder module is further used for by using both-end traveling wave
Method obtains the fault point distance.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, wherein：
Fig. 1 is the flow chart according to the fault distance-finding method of the power distribution network of the embodiment of the present invention；With
Fig. 2 is the structural schematic diagram according to the fault location device of the power distribution network of the embodiment of the present invention.
Specific implementation mode
The embodiment of the present invention is described below in detail, the example of embodiment is shown in the accompanying drawings, wherein identical from beginning to end
Or similar label indicates same or similar element or element with the same or similar functions.It is retouched below with reference to attached drawing
The embodiment stated is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
The fault distance-finding method and device of the power distribution network proposed according to embodiments of the present invention are described with reference to the accompanying drawings, first
The fault distance-finding method of the power distribution network proposed according to embodiments of the present invention is described with reference to the accompanying drawings.
Fig. 1 is the flow chart of the fault distance-finding method of the power distribution network of one embodiment of the invention.
As shown in Figure 1, the fault distance-finding method of the power distribution network includes the following steps：
In step S101, fault-signal is detected.
In one embodiment of the invention, fault-signal is detected, is further comprised：Acquire the circuit letter after failure occurs
Number；Fault-signal is obtained according to the line signal of acquisition.For example, obtaining failure letter by extracting temporal signatures and frequency domain character
Number, to improve the accuracy and real-time of detection, effectively promote working efficiency.
Optionally, in one embodiment of the invention, the embodiment of the present invention can use fault oscillograph record circuit
Signal.Specifically, fault oscillograph can be arranged in detection platform, thus automatically and accurately record circuit signal.For example, when height
Voltage circuit is deep in the mountains failure, and traditional artificial detection method has its limitation, and the embodiment of the present invention utilizes failure
Wave recording device extracts fault-signal, need to only can be realized in monitoring platform, reduces contact of the personnel to high voltage, not only more
Securely and reliably, and the applicability of detection is effectively improved.
In step s 102, fault-signal is decomposed and is reconstructed, to obtain the natural mode of vibration IMF components after reconstructing.
Specifically, it detects to obtain the natural mode of vibration and other features of fault-signal by step S101, and uses FIMD
(Fast Intrinsic Mode Decomposition, quick natural mode of vibration decompose) is decomposed and is reconstructed to fault-signal.
It should be noted that in an embodiment of the present invention, can effectively inhibit fault-signal modal overlap phenomenon using FIMD, quickly
Fault-signal is decomposed into a series of IMF components, so that quickly fault-signal is decomposed and be reconstructed, effectively shortens ranging
Time greatly reduces electric system power off time, ensures the reliability of power system power supply.
In step s 103, IMF components are decomposed, to extract the singular point of modulus maximum under the conditions of different faults.
Specifically, above-mentioned IMF components are the IMF components that fault-signal is decomposed and reconstructed, and modulus maxima
Value singular point is the time point that signal itself or its derivative at a time mutate, that is to say, that modulus maximum is unusual
Point is the point to break down in fault-signal.
Further, in one embodiment of the invention, IMF components are decomposed by wavelet transformation.It can manage
Solution, wavelet transformation is the local transformation to IMF components, thus information can be effectively extracted from signal, obtains one party
The prominent features of region feature are suitble to decompose IMF components, to obtain the singular point of modulus maximum under the conditions of different faults.
The specific aim for fault localization is improved, to improve range accuracy and efficiency.
Further, in one embodiment of the invention, extract different faults under the conditions of modulus maximum singular point,
In, different faults may include transient fault, permanent fault, insulation breakdown etc., thus can be accurate according to the type of failure
The singular point of different modulus maximums is obtained, the precision and efficiency of ranging are improved.
In addition, in an embodiment of the present invention, the embodiment of the present invention decomposes fault-signal and reconstructed using FIMD,
Using small echo to convert IMF components can be established with obtaining the means such as modulus maximum singular point in Fundamentals of Computer Technology
On, it is convenient that it is programmed, it is calculated by computer program, high efficient and reliable, and practicability is high.
In step S104, the fault time of singular point is obtained according to the singular point of modulus maximum, and according to fault time
Obtain fault point distance.
Specifically, in one embodiment of the invention, the embodiment of the present invention can be to the singular point of modulus maximum component
First derivative is sought, to obtain fault time according to the first derivative of singular point.
Further, in one embodiment of the invention, both-end traveling wave method may be used according to fault time and obtains event
Barrier point distance.Specifically, the principle that both-end traveling wave method utilizes is：The initial row wave generated using line-internal failure is rushed to
Absolute time when up to circuit both ends measurement point calculates fault point the distance between to both ends measurement point.In the embodiment of the present invention
In, calculated data obtain fault time, and obtain fault point between the measurement point of both ends by fault time
Distance determines specific abort situation.
Therefore, the embodiment of the present invention has algorithm relatively with single-ended traveling wave method and other fault positioning method for transmission line
Simply, high reliability.
The fault distance-finding method of the power distribution network of the embodiment of the present invention can obtain different according to the IMF components of fault-signal
The singular point of modulus maximum under fault condition, to obtain fault point distance, improves the accuracy of ranging to obtain fault time
And practicability, and simple easily realization, it is not only more safe and reliable, and meet the requirement of economy and high efficiency, it is promoted and is used
Family usage experience.
Referring next to the fault location device for the power distribution network that attached drawing description proposes according to embodiments of the present invention.
Fig. 2 is the fault location device of the power distribution network of one embodiment of the invention.
As shown in Fig. 2, the fault location device 10 of the power distribution network includes：Detection module 101, reconstructed module 102, extraction mould
Block 103 and range finder module 104.
Specifically, detection module 101 is for detecting fault-signal.Reconstructed module 102 is for decomposing fault-signal
And reconstruct, to obtain the natural mode of vibration IMF components after reconstructing.Extraction module 103 is for decomposing IMF components, with extraction
The singular point of modulus maximum under the conditions of different faults.Range finder module 104 is used to obtain singular point according to the singular point of modulus maximum
Fault time, and fault point distance is obtained according to fault time.The device 10 of the embodiment of the present invention can be according to fault-signal
IMF components obtain different faults under the conditions of modulus maximum singular point, to obtain fault time, with obtain fault point away from
From, improve the accuracy and practicability of ranging, and it is simple easily realize, it is not only more safe and reliable, and meet economy and
The requirement of high efficiency promotes user experience.
Further, in an embodiment of the invention, detection module 101 includes：Collecting unit and first acquisition unit.
Wherein, collecting unit is used to acquire the line signal of fault oscillograph record.First acquisition unit is used for the circuit according to record
Signal acquisition fault-signal.
Further, in an embodiment of the invention, extraction module 103 is further used for through wavelet transformation to IMF
Component is decomposed.
Further, in an embodiment of the invention, range finder module 104 includes：Second acquisition unit, for obtaining mould
The first derivative of the singular point of maximum；Third acquiring unit, for obtaining fault time according to the first derivative of singular point.
Further, in an embodiment of the invention, range finder module 104 is further used for obtaining using both-end traveling wave method
Fault point distance.
It should be noted that the explanation of the aforementioned fault distance-finding method embodiment to power distribution network is also applied for the implementation
The fault location device of the power distribution network of example, details are not described herein again.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on ... shown in the drawings or
Position relationship is merely for convenience of description of the present invention and simplification of the description, and does not indicate or imply the indicated device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of fault distance-finding method of power distribution network, which is characterized in that include the following steps：
Detect fault-signal；
The fault-signal is decomposed and reconstructed, to obtain the natural mode of vibration IMF components after reconstructing；
The IMF components are decomposed, to extract the singular point of modulus maximum under the conditions of different faults；And
The fault time of the singular point is obtained according to the singular point of the modulus maximum, and event is obtained according to the fault time
Barrier point distance.
2. the fault distance-finding method of power distribution network according to claim 1, which is characterized in that the detection fault-signal, into
One step includes：
Acquire the line signal of fault oscillograph record；
The fault-signal is obtained according to the line signal of the record.
3. the fault distance-finding method of power distribution network according to claim 1 or 2, which is characterized in that described to the IMF components
It is decomposed, is further comprised：
The IMF components are decomposed by wavelet transformation.
4. the fault distance-finding method of power distribution network according to claim 1, which is characterized in that described according to the modulus maximum
Singular point obtain fault time of the singular point, further comprise：
Obtain the first derivative of the singular point of the modulus maximum；
The fault time is obtained according to the first derivative of the singular point.
5. according to the fault distance-finding method of claim 1-4 any one of them power distribution networks, which is characterized in that described in the basis
Fault time obtains fault point distance, further comprises：
The fault point distance is obtained by using both-end traveling wave method.
6. a kind of fault location device of power distribution network, which is characterized in that including：
Detection module, for detecting fault-signal；
Reconstructed module, for the fault-signal to be decomposed and reconstructed, to obtain the natural mode of vibration IMF components after reconstructing；
Extraction module, for being decomposed to the IMF components, to extract the singular point of modulus maximum under the conditions of different faults；
Range finder module, the fault time for obtaining the singular point according to the singular point of the modulus maximum, and according to described
Fault time obtains fault point distance.
7. the fault location device of power distribution network according to claim 6, which is characterized in that the detection module includes：
Collecting unit, the line signal for acquiring fault oscillograph record；
First acquisition unit, for obtaining the fault-signal according to the line signal of the record.
8. the fault location device of the power distribution network described according to claim 6 or 7, which is characterized in that the extraction module is into one
Step is for decomposing the IMF components by wavelet transformation.
9. the fault location device of power distribution network according to claim 6, which is characterized in that the range finder module includes：
Second acquisition unit, the first derivative of the singular point for obtaining the modulus maximum；
Third acquiring unit, for obtaining the fault time according to the first derivative of the singular point.
10. according to the fault distance-finding method of claim 6-9 any one of them power distribution networks, which is characterized in that the ranging mould
Block is further used for obtaining the fault point distance by using both-end traveling wave method.
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| CN201810106633.9A CN108362974A (en) | 2018-02-02 | 2018-02-02 | The fault distance-finding method and device of power distribution network |
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| CN201810106633.9A CN108362974A (en) | 2018-02-02 | 2018-02-02 | The fault distance-finding method and device of power distribution network |
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