CN107907790A - A kind of aerial DC line transient fault recognition methods and system - Google Patents
A kind of aerial DC line transient fault recognition methods and system Download PDFInfo
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- CN107907790A CN107907790A CN201710968810.XA CN201710968810A CN107907790A CN 107907790 A CN107907790 A CN 107907790A CN 201710968810 A CN201710968810 A CN 201710968810A CN 107907790 A CN107907790 A CN 107907790A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
Abstract
The present invention provides a kind of aerial DC line transient fault recognition methods and system, including：When aerial DC line breaks down, AC line voltage is gathered, calculates the voltage spectrum of different pieces of information window；According to the voltage spectrum, it is determined whether be transient fault.Technical solution provided by the invention, transient fault is identified using voltage spectrum transient state component and voltage characteristic, improves soft straight overhead transmission line transient fault identification certainty.
Description
Technical field
The invention belongs to relay protection field, and in particular to a kind of aerial DC line transient fault recognition methods and be
System.
Background technology
When flexible direct current power grid uses overhead transmission line, the probability that transient fault occurs for transmission line of electricity significantly rises,
Failure cause includes lightning stroke, foreign matter, strong wind etc., after failure, by dc circuit breaker isolated fault circuit, for instantaneity event
Barrier by overlapping dc circuit breaker, it is necessary to recover DC line power supply.
The recognition methods of DC line transient fault at present is to be overlapped after being tripped by dc circuit breaker through constant time lag
Dc circuit breaker, if failure vanishes, is judged as transient fault；If failure still suffers from, it is judged as permanent fault, again tripping
Dc circuit breaker.
There are following defect for the recognition methods：
Judge inaccuracy, cause when permanent fault occurs, overlap dc circuit breaker, this will make DC grid and event
Barrier point forms current path, and fault current forms secondary pulse to dc circuit breaker and DC converter, is unfavorable for DC grid
Stable operation.
The content of the invention
Judge DC line transient fault recognition methods to DC grid by overlapping dc circuit breaker for existing
Secondary pulse influences, and the present invention proposes a kind of aerial DC line transient fault recognition methods and system, after a failure directly
Stream breaker is judged before overlapping, and dc circuit breaker is overlapped according to judging result, if failure is transient fault, overlaps direct current
Breaker；If failure is permanent fault, misaligned dc circuit breaker.The present invention can eliminate existing dc circuit breaker and coincide with
Failure secondary pulse caused by straight-flow system, ensures the stable operation of soft lineal system.
The present invention provides a kind of aerial DC line transient fault recognition methods, including：
When aerial DC line breaks down, AC line voltage is gathered, calculates the voltage spectrum of different pieces of information window；
According to the voltage spectrum, it is determined whether be transient fault.
It is described according to the voltage spectrum, it is determined whether be transient fault, including：
When the transient state component amplitude of voltage spectrum is less than default first definite value, voltage magnitude is calculated；
When the voltage magnitude is more than default three definite value, it is determined as transient fault.
It is described according to the voltage spectrum, it is determined whether be transient fault, including：
When the transient state component amplitude of voltage spectrum is more than default first definite value, the voltage spectrum of different pieces of information window is calculated
The degree of correlation；
When the degree of correlation of the voltage spectrum is more than default second definite value, it is determined as transient fault.
The degree of correlation of the voltage spectrum is calculated as follows：
Wherein, ρ is the voltage spectrum degree of correlation, and E (X) and E (Y) are respectively the spectrum energy of different pieces of information window, and X, Y are difference
Data window；
Wherein, x (n), y (n) are respectively the sampled value of different periods voltage spectrum, and N is the sampled point calculated in data window
Number；
The voltage spectrum of different pieces of information window is calculated with the fast algorithm FFT of discrete fourier transform.
Second definite value is 0.5.
First definite value and the 3rd definite value in RTDS real time data displays by establishing flexible direct current circuit model
Post-simulation obtains.
According to the voltage spectrum, it is determined whether before being transient fault, further include：
The voltage spectrum is normalized.
The present invention provides a kind of aerial DC line transient fault identifying system, including：
Computing module, for when aerial DC line breaks down, gathering AC line voltage, calculates different pieces of information window
Voltage spectrum；
Determining module, for according to the voltage spectrum, it is determined whether be transient fault.
The determining module includes：
First calculating sub module, for when the transient state component amplitude of voltage spectrum is less than default first definite value, calculating
Voltage magnitude；
First determination sub-module, for when the voltage magnitude is more than default three definite value, being determined as instantaneity event
Barrier.
The determining module includes：
Second calculating sub module, for when the transient state component amplitude of voltage spectrum is more than default first definite value, calculating
The degree of correlation of the voltage spectrum of different pieces of information window；
Second determination sub-module, for when the degree of correlation of the voltage spectrum is more than default second definite value, being determined as
Transient fault.
The present invention provides a kind of aerial DC line transient fault processing method, including：
When aerial DC line breaks down, AC line voltage is gathered, calculates the voltage spectrum of different pieces of information window；
According to the voltage spectrum, it is determined whether be transient fault；
Dc circuit breaker is overlapped when the definite failure is transient fault, otherwise misaligned dc circuit breaker.
The present invention provides a kind of aerial DC line transient fault processing system, including：
Identification module, for when aerial DC line breaks down, gathering AC line voltage, calculates different pieces of information window
Voltage spectrum；According to the voltage spectrum, it is determined whether be transient fault；
Control module is otherwise misaligned straight for overlapping dc circuit breaker when the definite failure is transient fault
Flow breaker.
Compared with the latest prior art, technical solution provided by the invention has the advantages that：
Technical solution provided by the invention, identifies transient fault using voltage spectrum transient state component and voltage characteristic, carries
High soft straight overhead transmission line transient fault identification certainty, it is ensured that the accuracy of breakdown judge.
Technical solution provided by the invention, by accurately identifying transient fault, eliminates direct current interruption in the prior art
Think highly of the secondary pulse to straight-flow system together in permanent fault.
Brief description of the drawings
Fig. 1 is the flow diagram that a kind of aerial DC line transient fault recognition methods of the present invention is implemented；
Fig. 2 is embodiment transient fault disappearance prior fault voltage traveling wave path figure；
Fig. 3 is the frequency component schematic diagram before embodiment transient fault disappears；
False voltage traveling wave path figure after Fig. 4 disappears for embodiment transient fault；
Fig. 5 is the frequency component schematic diagram after embodiment transient fault disappears.
Embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings：
Embodiment one,
The present invention provides a kind of aerial DC line transient fault recognition methods, and operation principle is as follows：
Dc circuit breaker isolated fault circuit during transient fault, the process after dc circuit breaker disconnects are divided into transient state and steady
State two, wherein transient process are divided into before and after transient fault eliminates, transient fault eliminate prior fault feature with it is permanent
Fault signature is identical, fault signature and significant difference before disappearance after transient fault disappears.
(1) after dc circuit breaker disconnects, transient fault disappearance prior fault voltage traveling wave path is as shown in Fig. 2, on frequency spectrum
A series of frequency components are shown as, as shown in Figure 3.
(2) after dc circuit breaker disconnects, false voltage traveling wave path is as shown in figure 4, spectrum signature after transient fault disappears
As shown in Figure 5.
(3) after dc circuit breaker disconnects, into stable state, since mutual inductance influences, AC line voltage stabilization, should in fixed value
It is related to voltage class and mutual inductance to be worth size.
Fig. 1 is the flow diagram that a kind of aerial DC line transient fault recognition methods of the present invention is implemented, such as Fig. 1 institutes
Show, the present invention provides a kind of aerial DC line transient fault recognition methods, may include steps of：
When aerial DC line breaks down, AC line voltage is gathered, calculates the voltage spectrum of different pieces of information window；
According to the voltage spectrum, it is determined whether be transient fault.
It is described according to the voltage spectrum, it is determined whether be transient fault, can include：
When the transient state component amplitude of voltage spectrum is less than default first definite value, voltage magnitude is calculated；
When the voltage magnitude is more than default three definite value, it is determined as transient fault.
It is described according to the voltage spectrum, it is determined whether be transient fault, can include：
When the transient state component amplitude of voltage spectrum is more than default first definite value, the voltage spectrum of different pieces of information window is calculated
The degree of correlation；
When the degree of correlation of the voltage spectrum is more than default second definite value, it is determined as transient fault.
The degree of correlation of the voltage spectrum may be calculated as：
Wherein, ρ is the voltage spectrum degree of correlation, and E (X) and E (Y) are respectively the spectrum energy of different pieces of information window, and X, Y are difference
Data window；
Wherein, x (n), y (n) are respectively the sampled value of different periods voltage spectrum, and N is the sampled point calculated in data window
Number；
When it is implemented, the fast algorithm FFT of discrete fourier transform can be used to calculate the voltage spectrum of different pieces of information window.
Second definite value can be 0.5.
First definite value and the 3rd definite value can be by establishing flexible direct current circuit in RTDS real time data displays
Model post-simulation obtains.
The method can also include：
The voltage spectrum is normalized before voltage spectrum transient state component amplitude is judged.
The aerial DC line transient fault recognition methods that the embodiment of the present invention is provided, utilizes voltage spectrum transient state point
Amount and voltage characteristic identification transient fault, improve soft straight overhead transmission line transient fault identification certainty, it is ensured that failure is sentenced
Disconnected accuracy.
When it is implemented, when the definite failure is transient fault, the embodiment of the present invention can be overlapped further directly
Breaker is flowed, otherwise misaligned dc circuit breaker.
Embodiment two,
Based on identical design, the present invention provides a kind of aerial DC line transient fault identifying system, can include：
Computing module, for gathering AC line voltage, calculates the voltage spectrum of different pieces of information window；
Judgment module, for according to voltage spectrum, judging whether voltage spectrum transient state component amplitude is less than default first
Definite value, if calculating voltage magnitude less than if, otherwise, calculates the degree of correlation of the voltage spectrum of different pieces of information window；
Determining module, for being determined whether according to the voltage magnitude or the voltage spectrum degree of correlation for instantaneity event
Barrier.
The determining module includes：
First calculating sub module, for when the transient state component amplitude of voltage spectrum is less than default first definite value, calculating
Voltage magnitude；
First determination sub-module, for when the voltage magnitude is more than default three definite value, being determined as instantaneity event
Barrier.
The determining module includes：
Second calculating sub module, for when the transient state component amplitude of voltage spectrum is more than default first definite value, calculating
The degree of correlation of the voltage spectrum of different pieces of information window；
Second determination sub-module, for when the degree of correlation of the voltage spectrum is more than default second definite value, being determined as
Transient fault.
Second calculating sub module, is calculated as follows the voltage spectrum degree of correlation：
Wherein, ρ is the voltage spectrum degree of correlation, and E (X) and E (Y) are respectively the spectrum energy of different pieces of information window, x (n), y (n)
The respectively sampled value of different periods voltage spectrum, N are the sampling number calculated in data window.
The computing module calculates the voltage spectrum of different pieces of information window with fft algorithm.
Second definite value in the determining module is 0.5.
First definite value and the 3rd definite value in RTDS real time data displays by establishing flexible direct current circuit model
Post-simulation obtains, and the input of analogue system is flexible direct current line parameter circuit value, exports as AC line voltage after failure and voltage frequency
Spectrum.
The aerial DC line transient fault identifying system that the embodiment of the present invention is provided, utilizes voltage spectrum transient state point
Amount and voltage characteristic identification transient fault, improve soft straight overhead transmission line transient fault identification certainty, it is ensured that failure is sentenced
Disconnected accuracy.
When it is implemented, when the definite failure is transient fault, the embodiment of the present invention can be controlled further directly
Flow breaker to overlap, otherwise control dc circuit breaker misaligned.
Embodiment three,
, can be with the present invention also provides a kind of aerial DC line transient fault processing method based on same inventive concept
Include the following steps：
When aerial DC line breaks down, AC line voltage is gathered, calculates the voltage spectrum of different pieces of information window；
According to the voltage spectrum, it is determined whether be transient fault；
Dc circuit breaker is overlapped when the definite failure is transient fault, otherwise misaligned dc circuit breaker.
Fault handling method provided by the present invention, is judged before dc circuit breaker coincidence, according to judgement after a failure
As a result dc circuit breaker is overlapped, if failure is transient fault, overlaps dc circuit breaker；If failure is permanent fault, do not weigh
Close dc circuit breaker.The present invention can eliminate existing dc circuit breaker and coincide with failure secondary pulse caused by straight-flow system,
Ensure the stable operation of soft lineal system.
Example IV,
Based on identical design, the present invention provides a kind of aerial DC line transient fault processing system, can include：
Identification module, for when aerial DC line breaks down, gathering AC line voltage, calculates different pieces of information window
Voltage spectrum；According to the voltage spectrum, it is determined whether be transient fault；
Control module is otherwise misaligned straight for overlapping dc circuit breaker when the definite failure is transient fault
Flow breaker.
Fault processing system provided by the present invention, is judged before dc circuit breaker coincidence, according to judgement after a failure
As a result dc circuit breaker is overlapped, if failure is transient fault, control dc circuit breaker overlaps；If failure is permanent event
Barrier, then control dc circuit breaker misaligned.The present invention, which can eliminate existing dc circuit breaker and coincide with failure, makes straight-flow system
Into secondary pulse, ensure the stable operation of soft lineal system.
Embodiment five,
(1) for the soft lineal systems of ± 500kV, AC line trackside voltage transformer is utilized to gather AC line trackside voltage U, profit
Different pieces of information window-voltage frequency spectrum is calculated with FFT, data window length is at 200 points；
(2) normalized is taken to voltage spectrum；
(3) according to the voltage spectrum after normalization, judge whether voltage spectrum transient state component amplitude is less than 1KV, if being less than
Voltage magnitude is then calculated, otherwise, calculates the degree of correlation of the voltage spectrum of different pieces of information window；
(4) determined whether according to the voltage magnitude or the voltage spectrum degree of correlation for transient fault；
(5) when judging result is transient fault, dc circuit breaker is overlapped；When judging result is permanent fault, do not weigh
Close dc circuit breaker.
It is described to determine whether to include for transient fault according to the voltage magnitude：
Judge whether the voltage magnitude is less than 500V, be transient fault otherwise for permanent fault if being less than.
It is described to determine whether to include for transient fault according to the voltage spectrum degree of correlation：
Judge whether the degree of correlation is less than 0.5, be transient fault otherwise for permanent fault if being less than.
The degree of correlation of different pieces of information window DC voltage frequency spectrum is calculated as follows：
Wherein ρ is the frequency spectrum degree of correlation, and E (X) and E (Y) are respectively the spectrum energy x (n) of time windows, and y (n) is respectively
The sampled value of different periods voltage spectrum, N are the sampling number calculated in data window.
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 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 it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or square frame in journey and/or square frame and flowchart and/or the block diagram.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 the instruction performed by computer or the processor of other programmable data processing devices, which produces, to be used in fact
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 also be 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, thus in computer or
The instruction performed on other programmable devices is provided and is used for realization in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a square frame or multiple square frames.
Finally it should be noted that：Above example is merely to illustrate technical scheme rather than to its protection domain
Limitation, although the application is described in detail with reference to above-described embodiment, those of ordinary skill in the art should
Understand：Those skilled in the art read the embodiment of application can be still carried out after the application a variety of changes, modification or
Person's equivalent substitution, but these changes, modification or equivalent substitution, are applying within pending claims.
Claims (13)
- A kind of 1. aerial DC line transient fault recognition methods, it is characterised in that including：When aerial DC line breaks down, AC line voltage is gathered, calculates the voltage spectrum of different pieces of information window；According to the voltage spectrum, it is determined whether be transient fault.
- 2. aerial DC line transient fault recognition methods as claimed in claim 1, it is characterised in that described in the basis Voltage spectrum, it is determined whether it is transient fault, including：When the transient state component amplitude of voltage spectrum is less than default first definite value, voltage magnitude is calculated；When the voltage magnitude is more than default three definite value, it is determined as transient fault.
- 3. aerial DC line transient fault recognition methods as claimed in claim 1 or 2, it is characterised in that the basis The voltage spectrum, it is determined whether it is transient fault, including：When the transient state component amplitude of voltage spectrum is more than default first definite value, the phase of the voltage spectrum of different pieces of information window is calculated Guan Du；When the degree of correlation of the voltage spectrum is more than default second definite value, it is determined as transient fault.
- 4. aerial DC line transient fault recognition methods as claimed in claim 3, it is characterised in that the voltage spectrum The degree of correlation be calculated as follows：<mrow> <mi>&rho;</mi> <mo>=</mo> <mfrac> <mrow> <mi>cov</mi> <mrow> <mo>(</mo> <mi>X</mi> <mo>,</mo> <mi>Y</mi> <mo>)</mo> </mrow> </mrow> <msqrt> <mrow> <mi>E</mi> <mrow> <mo>(</mo> <mi>X</mi> <mo>)</mo> </mrow> <mo>&times;</mo> <mi>E</mi> <mo>(</mo> <mi>Y</mi> <mo>)</mo> </mrow> </msqrt> </mfrac> </mrow>Wherein, ρ is the voltage spectrum degree of correlation, and E (X) and E (Y) are respectively the spectrum energy of different pieces of information window, and X, Y are different numbers According to window；<mrow> <mi>E</mi> <mrow> <mo>(</mo> <mi>X</mi> <mo>)</mo> </mrow> <mo>=</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mrow> <mi>N</mi> </munderover> <msup> <mi>x</mi> <mn>2</mn> </msup> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> </mrow><mrow> <mi>E</mi> <mrow> <mo>(</mo> <mi>Y</mi> <mo>)</mo> </mrow> <mo>=</mo> <munderover> <mo>&Sigma;</mo> <mrow> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mrow> <mi>N</mi> </munderover> <msup> <mi>y</mi> <mn>2</mn> </msup> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> </mrow>Wherein, x (n), y (n) are respectively the sampled value of different periods voltage spectrum, and N is the sampling number calculated in data window；
- 5. aerial DC line transient fault recognition methods as claimed in claim 1, it is characterised in that become with discrete Fourier The fast algorithm FFT changed calculates the voltage spectrum of different pieces of information window.
- 6. aerial DC line transient fault recognition methods as claimed in claim 3, it is characterised in that second definite value For 0.5.
- 7. aerial DC line transient fault recognition methods as claimed in claim 2, it is characterised in that first definite value Obtained with the 3rd definite value by establishing flexible direct current circuit model post-simulation in RTDS real time data displays.
- 8. aerial DC line transient fault recognition methods as claimed in claim 1, it is characterised in that according to the electricity Voltage-frequency is composed, it is determined whether before being transient fault, is further included：The voltage spectrum is normalized.
- A kind of 9. aerial DC line transient fault identifying system, it is characterised in that including：Computing module, for when aerial DC line breaks down, gathering AC line voltage, calculates the electricity of different pieces of information window Voltage-frequency is composed；Determining module, for according to the voltage spectrum, it is determined whether be transient fault.
- 10. aerial DC line transient fault identifying system as claimed in claim 9, it is characterised in that the definite mould Block includes：First calculating sub module, for when the transient state component amplitude of voltage spectrum is less than default first definite value, calculating voltage Amplitude；First determination sub-module, for when the voltage magnitude is more than default three definite value, being determined as transient fault.
- 11. the aerial DC line transient fault identifying system as described in claim 9 or 10, it is characterised in that described true Cover half block includes：Second calculating sub module is different for when the transient state component amplitude of voltage spectrum is more than default first definite value, calculating The degree of correlation of the voltage spectrum of data window；Second determination sub-module, it is instantaneous for when the degree of correlation of the voltage spectrum is more than default second definite value, being determined as Property failure.
- A kind of 12. aerial DC line transient fault processing method, it is characterised in that including：When aerial DC line breaks down, AC line voltage is gathered, calculates the voltage spectrum of different pieces of information window；According to the voltage spectrum, it is determined whether be transient fault；Dc circuit breaker is overlapped when the definite failure is transient fault, otherwise misaligned dc circuit breaker.
- A kind of 13. aerial DC line transient fault processing system, it is characterised in that including：Identification module, for when aerial DC line breaks down, gathering AC line voltage, calculates the electricity of different pieces of information window Voltage-frequency is composed；According to the voltage spectrum, it is determined whether be transient fault；Control module, for overlapping dc circuit breaker when the definite failure is transient fault, otherwise misaligned direct current breaks Road device.
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| CN114295932A (en) * | 2021-11-30 | 2022-04-08 | 国网北京市电力公司 | Fault positioning method and device and electronic equipment |
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| T.Y.WU: "Characterization of gear faults in variable rotating speed using Hilbert-Huang Transform and instantaneous dimensionless frequency normalization", 《MECHANICAL SYSTEMS AND SIGNAL PROCESSING》 * |
| 刘超: "特高压电网自适应重合闸的研究", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
| 宋国兵: "输电线路永久性故障判别方法综述", 《电网技术》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109659910A (en) * | 2018-11-28 | 2019-04-19 | 天津大学 | Flexible direct current electric network fault property identification method based on mixed type dc circuit breaker |
| CN109659910B (en) * | 2018-11-28 | 2019-12-27 | 天津大学 | Flexible direct-current power grid fault property identification method based on hybrid direct-current circuit breaker |
| CN114295932A (en) * | 2021-11-30 | 2022-04-08 | 国网北京市电力公司 | Fault positioning method and device and electronic equipment |
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