CN107390089A - Transient zero-sequence current signal synchronizing method and device are realized in distributed system - Google Patents
Transient zero-sequence current signal synchronizing method and device are realized in distributed system Download PDFInfo
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- CN107390089A CN107390089A CN201710588534.4A CN201710588534A CN107390089A CN 107390089 A CN107390089 A CN 107390089A CN 201710588534 A CN201710588534 A CN 201710588534A CN 107390089 A CN107390089 A CN 107390089A
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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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Abstract
The present invention relates to realize transient zero-sequence current signal synchronizing method and device in a kind of distributed system.Gather the transient zero-sequence current of adjacent feeders terminal feedback；The transient zero-sequence current amplitude of two-way transient zero-sequence current is calculated respectively, finds respective transient zero-sequence current amplitude maximum point；Transient zero-sequence current waveform similarity factor is calculated according to the transient zero-sequence current amplitude maximum point；At the time of correspondence during by similarity factor maximum, at the time of being defined as fault message synchronization.The inventive method solves the delay caused by exchange trouble information each other of adjacent feeders terminal, is laid a good foundation for the positioning of distributed intelligence low current grounding, solves a great problem of puzzlement power department；This method only utilizes transient current signal, applied widely, and method is simple and easily realizes.
Description
Technical field
The present invention relates to the Fault Recorder Information that line feed terminals in distributed intelligence fault location exchange each other, and utilize friendship
The transient zero-sequence current amplitude changed in fault message realizes the synchronous method of data-signal, belongs to electric automatization field, specifically
It is related in a kind of distributed system and realizes transient zero-sequence current signal synchronizing method and device.
Background technology
Conventional electrical distribution net has complicated, loads the characteristics of more dispersed, and the probability that transmission line of electricity breaks down is very high,
The especially singlephase earth fault of small current system.To determine the position of low current grounding, waveform analogue method, ripple can be used
Shape analogue method needs synchronizing information, if fault message is asynchronous, it will causes waveform similarity factor to produce error, causes to position
It is inaccurate.As can be seen here, at the time of determining the fault message synchronization that line feed terminals exchange, to transient zero-sequence current similarity factor
Calculate, ensure that the smooth implementation of distributed intelligence low current grounding positioning all has great importance.
The technical problem to be solved in the present invention is：Transient zero-sequence current signal synchronizing method is realized in distributed system, it is special
It is not the application in distributed intelligence low current grounding localization method.Positioned in distributed intelligence low current grounding
In, adjacent feeders terminal (Federal Terminal Unit, FTU) exchanges the transient zero-sequence current information detected each other,
Certain delay in exchange process be present, cause fault message asynchronous.
The content of the invention
It is an object of the invention to provide realize transient zero-sequence current signal synchronizing method and dress in a kind of distributed system
Put, this method solve the delay caused by exchange trouble information each other of adjacent feeders terminal, be distributed intelligence small current neutral grounding
Fault location is laid a good foundation, and solves a great problem of puzzlement power department.
To achieve the above object, the technical scheme is that：Realize that transient zero-sequence current is believed in a kind of distributed system
Number synchronous method, the transient zero-sequence current of collection adjacent feeders terminal feedback；The transient state of two-way transient zero-sequence current is calculated respectively
Zero-sequence current amplitude, find respective transient zero-sequence current amplitude maximum point；According to the transient zero-sequence current amplitude maximum point
Calculate transient zero-sequence current waveform similarity factor；At the time of correspondence during by similarity factor maximum, it is defined as fault message synchronization
Moment.
In an embodiment of the present invention, the calculating of the transient zero-sequence current amplitude is the feeder line after line failure
When the mutual transient zero-sequence current information of terminal switch.
In an embodiment of the present invention, the calculation formula of the transient zero-sequence current amplitude is as follows：
In formula, T0For the time interval after line failure, i (t) is the instantaneous value of transient zero-sequence current.
In an embodiment of the present invention, the T0Value is 2ms.
In an embodiment of the present invention, it is described that final datum mark detailed process is found with transient zero-sequence current amplitude maximum point
For：First, using transient zero-sequence current amplitude maximum point as initial baseline point, 1/4 frequency cycle is slid back and forth, often slides one
Point, a transient zero-sequence current waveform similarity factor is calculated, find transient zero-sequence current waveform similarity factor maximum absolute value
Position, i.e., as final datum mark.
In an embodiment of the present invention, the frequency cycle is 5ms.
In an embodiment of the present invention, the calculation formula of the transient zero-sequence current waveform similarity factor is as follows：
In formula, ikAnd i (t)k+1(t) it is respectively transient zero-sequence current that adjacent feeders terminal detects；T is sample sequence；
N is total length of data；τ is the points of transient zero-sequence current translation；Because adjacent feeders terminal transmission transient current information needs
It is delayed several milliseconds, therefore typically sets the scope of the τ to take 1~2ms according to precision during live adjacent feeders terminal-pair.
Present invention also offers realizing transient zero-sequence current signal sychronisation in a kind of distributed system, including,
Collecting unit, for gathering the transient zero-sequence current of adjacent feeders terminal feedback；
First computing unit, for calculating the transient zero-sequence current amplitude of two-way transient zero-sequence current respectively, find each
Transient zero-sequence current amplitude maximum point；
Second computing unit, for calculating transient zero-sequence current waveform phase according to the transient zero-sequence current amplitude maximum point
Like coefficient；
Determining unit, at the time of correspondence during for by similarity factor maximum, at the time of being defined as fault message synchronization.
In an embodiment of the present invention, the calculation formula of the transient zero-sequence current amplitude is as follows：
In formula, T0For the time interval after line failure, i (t) is the instantaneous value of transient zero-sequence current；
The calculation formula of the transient zero-sequence current waveform similarity factor is as follows：
In formula, ikAnd i (t)k+1(t) it is respectively transient zero-sequence current that adjacent feeders terminal detects；T is sample sequence；
N is total length of data；τ is the points of transient zero-sequence current translation.
Compared to prior art, the invention has the advantages that：The present invention is using transient zero-sequence current amplitude come real
The synchronization of existing data-signal, the particularly application in distributed intelligence low current grounding localization method；In distributed intelligence
In energy low current grounding positioning, adjacent feeders terminal (Federal Terminal Unit, FTU) is exchanged and detected each other
Transient zero-sequence current information, certain delay in exchange process be present, cause fault message asynchronous；The inventive method is led to
Calculating transient zero-sequence current amplitude is crossed, finds the point of transient zero-sequence current amplitude maximum；The transient zero-sequence current of amplitude maximum point
Similarity factor is also maximum, and initial time differs also just smaller, is now considered as data-signal and has reached synchronization；This method solves
Adjacent feeders terminal is delayed caused by exchange trouble information each other, is established for the positioning of distributed intelligence low current grounding
Basis, solves a great problem of puzzlement power department；This method only utilizes transient current signal, applied widely, method letter
Single and easily realization.
Brief description of the drawings
The distributed intelligence fault location schematic diagram of Fig. 1 present invention.
The transient zero-sequence current distributed wave rule schematic diagram of Fig. 2 present invention.
Fig. 3 the inventive method flow charts.
Embodiment
Below in conjunction with the accompanying drawings, technical scheme is specifically described.
Transient zero-sequence current signal synchronizing method is realized in a kind of distributed system of the present invention, gathers adjacent feeders terminal
The transient zero-sequence current of feedback；The transient zero-sequence current amplitude of two-way transient zero-sequence current is calculated respectively, finds respective transient state
Zero-sequence current amplitude maximum point；The similar system of transient zero-sequence current waveform is calculated according to the transient zero-sequence current amplitude maximum point
Number；At the time of correspondence during by similarity factor maximum, at the time of being defined as fault message synchronization.
The calculating of the transient zero-sequence current amplitude is after line failure, and line feed terminals exchange mutual transient state zero
When sequence current information.The calculation formula of the transient zero-sequence current amplitude is as follows：
In formula, T0For the time interval after line failure, i (t) is the instantaneous value of transient zero-sequence current.The T0
Value is 2ms.
It is described using transient zero-sequence current amplitude maximum point find final datum mark detailed process as：First, with transient zero-sequence
Current amplitude maximum point slides back and forth 1/4 frequency cycle, often slides a point, calculate a transient state zero as initial baseline point
Sequence current waveform similarity factor, the position of transient zero-sequence current waveform similarity factor maximum absolute value is found, i.e., as final base
On schedule.The frequency cycle is 5ms.
The calculation formula of the transient zero-sequence current waveform similarity factor is as follows：
In formula, ikAnd i (t)k+1(t) it is respectively transient zero-sequence current that adjacent feeders terminal detects；T is sample sequence；
N is total length of data；τ is the points of transient zero-sequence current translation；Because adjacent feeders terminal transmission transient current information needs
It is delayed several milliseconds, therefore typically sets τ scope to take 1~2ms according to precision during live adjacent feeders terminal-pair.
Present invention also offers realizing transient zero-sequence current signal sychronisation in a kind of distributed system, including,
Collecting unit, for gathering the transient zero-sequence current of adjacent feeders terminal feedback；
First computing unit, for calculating the transient zero-sequence current amplitude of two-way transient zero-sequence current respectively, find each
Transient zero-sequence current amplitude maximum point；
Second computing unit, for calculating transient zero-sequence current waveform phase according to the transient zero-sequence current amplitude maximum point
Like coefficient；
Determining unit, at the time of correspondence during for by similarity factor maximum, at the time of being defined as fault message synchronization.
It is below the specific implementation process of the present invention.
As shown in Figure 1：
After line failure, the line feed terminals in circuit start and detected each other with adjacent feeders terminal switch former
Hinder information.
As shown in Figure 2：
The situation of change of line failure, trouble point upstream and downstream and regular link transient zero-sequence current amplitude；If feedback
The mutual fault message of exchange of line terminal is, it is necessary at the time of finding data syn-chronization.The transient zero-sequence electricity of two waveforms is calculated first
Amplitude is flowed, finds transient zero-sequence current amplitude maximum point；Transient zero-sequence current waveform similarity factor is calculated again.The point of amplitude maximum
And the point that waveform similarity factor is maximum, now initial error is minimum, is approximately considered data-signal synchronization.
As shown in figure 3, comprise the following steps that:
Step 1, logic flow starts；
Step 2, transient zero-sequence current amplitude is calculated：
After line failure, line feed terminals exchange mutual transient zero-sequence current information, by calculating and comparing feeder line
The transient zero-sequence current amplitude detected of terminal, finds transient zero-sequence current amplitude maximum point.After line failure, necessarily
Time T0Interior transient zero-sequence current amplitude calculation formula is：
In formula：T0Take 2ms；I (t) is the instantaneous value of transient zero-sequence current.
Step 3, the synchronous mark of transient signal is determined
The transient zero-sequence current that collection line feed terminals detect, and calculate transient zero-sequence current amplitude, transient zero-sequence current
The calculation formula (1) of amplitude；Transient zero-sequence current amplitude maximum point is found by the calculating of transient zero-sequence current amplitude, it is determined that temporarily
The synchronous mark of state zero sequence signal, using the transient zero-sequence current amplitude maximum point alignment of two waveforms as datum mark, calculate feedback
The transient zero-sequence current waveform similarity factor that line terminal detects.
Step 4, transient zero-sequence current waveform similarity factor is calculated：
The calculation formula of transient zero-sequence current waveform similarity factor is as follows：
In formula, ikAnd i (t)k+1(t) it is respectively transient zero-sequence current that adjacent feeders terminal detects；T is sample sequence；
N is total length of data；τ is the points of transient zero-sequence current translation；Because adjacent feeders terminal transmission transient current information needs
It is delayed several milliseconds, therefore typically according to precision during live adjacent feeders terminal-pair, the length for setting τ is 1~2ms.
Step 5, using transient zero-sequence current amplitude maximum point as initial baseline point, 1/4 frequency cycle is slid back and forth
(5ms), a point is often slided, calculate a transient zero-sequence current waveform similarity factor, find similarity factor maximum absolute value
Position, as final datum mark.And similarity factor now is recorded as to final similarity factor.By calculating relatively,
Transient zero-sequence current amplitude maximum point transient zero-sequence current waveform similarity factor is also maximum, the initial time difference of two waveforms
With regard to minimum, now it is considered as signal and has reached synchronization.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, the application can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the application can use the computer for wherein including computer usable program code in one or more
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to the flow according to the method for the embodiment of the present application, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
Its
The instruction that he performs on programmable device is provided for realizing in one flow of flow chart or multiple flows and/or side
The step of function of being specified in one square frame of block diagram or multiple square frames.
The above described is only a preferred embodiment of the present invention, being not the limitation for making other forms to the present invention, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment.But it is every without departing from technical solution of the present invention content, the technical spirit according to the present invention is to above example institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection domain of technical solution of the present invention.
Claims (10)
1. transient zero-sequence current signal synchronizing method is realized in a kind of distributed system, it is characterised in that：It is whole to gather adjacent feeders
Hold the transient zero-sequence current of feedback；The transient zero-sequence current amplitude of two-way transient zero-sequence current is calculated respectively, is found respective temporary
State zero-sequence current amplitude maximum point；The similar system of transient zero-sequence current waveform is calculated according to the transient zero-sequence current amplitude maximum point
Number；At the time of correspondence during by similarity factor maximum, at the time of being defined as fault message synchronization.
2. transient zero-sequence current signal synchronizing method is realized in distributed system according to claim 1, it is characterised in that：
The calculating of the transient zero-sequence current amplitude is after line failure, and line feed terminals exchange mutual transient zero-sequence current letter
When breath.
3. realizing transient zero-sequence current signal synchronizing method in distributed system according to claim 1 or 2, its feature exists
In：The calculation formula of the transient zero-sequence current amplitude is as follows：
In formula,For the time interval after line failure,It is the instantaneous value of transient zero-sequence current.
4. transient zero-sequence current signal synchronizing method is realized in distributed system according to claim 3, it is characterised in that：
It is describedValue is 2ms.
5. transient zero-sequence current signal synchronizing method is realized in distributed system according to claim 1, it is characterised in that：
Detailed process when finding similarity factor maximum at the time of correspond to is：Initial baseline is used as using transient zero-sequence current amplitude maximum point
Point, 1/4 frequency cycle is slid back and forth, often slide a point, calculate a transient zero-sequence current waveform similarity factor, find transient state
The position of zero-sequence current waveform similarity factor maximum absolute value, i.e., as final datum mark.
6. transient zero-sequence current signal synchronizing method is realized in distributed system according to claim 5, it is characterised in that：
The frequency cycle is 5ms.
7. realizing transient zero-sequence current signal synchronizing method in distributed system according to claim 1 or 5, its feature exists
In：The calculation formula of the transient zero-sequence current waveform similarity factor is as follows：
In formula,WithThe transient zero-sequence current that respectively adjacent feeders terminal detects；For sample sequence；
For total length of data；It is the points of transient zero-sequence current translation.
8. transient zero-sequence current signal synchronizing method is realized in distributed system according to claim 7, it is characterised in that：
It is describedScope take 1 ~ 2ms.
9. transient zero-sequence current signal sychronisation is realized in a kind of distributed system, it is characterised in that：Including,
Collecting unit, for gathering the transient zero-sequence current of adjacent feeders terminal feedback；
First computing unit, for calculating the transient zero-sequence current amplitude of two-way transient zero-sequence current respectively, find respective temporary
State zero-sequence current amplitude maximum point；
Second computing unit, for calculating the similar system of transient zero-sequence current waveform according to the transient zero-sequence current amplitude maximum point
Number；
Determining unit, at the time of correspondence during for by similarity factor maximum, at the time of being defined as fault message synchronization.
10. realizing transient zero-sequence current signal sychronisation in distributed system according to claim 9, its feature exists
In：The calculation formula of the transient zero-sequence current amplitude is as follows：
In formula,For the time interval after line failure,It is the instantaneous value of transient zero-sequence current；
The calculation formula of the transient zero-sequence current waveform similarity factor is as follows：
In formula,WithThe transient zero-sequence current that respectively adjacent feeders terminal detects；For sample sequence；
For total length of data；It is the points of transient zero-sequence current translation.
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| CN113075500A (en) * | 2021-03-22 | 2021-07-06 | 广西电网有限责任公司河池供电局 | Similarity single-phase earth fault positioning method based on sliding window and application |
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