CN108169612A - The localization method of overhead line DC transmission system DC short trouble - Google Patents
The localization method of overhead line DC transmission system DC short trouble Download PDFInfo
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- CN108169612A CN108169612A CN201711476863.6A CN201711476863A CN108169612A CN 108169612 A CN108169612 A CN 108169612A CN 201711476863 A CN201711476863 A CN 201711476863A CN 108169612 A CN108169612 A CN 108169612A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 79
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- 230000004807 localization Effects 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 230000008878 coupling Effects 0.000 claims abstract description 19
- 238000010168 coupling process Methods 0.000 claims abstract description 19
- 238000005859 coupling reaction Methods 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 14
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 230000005611 electricity Effects 0.000 claims description 17
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 6
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- 210000001367 artery Anatomy 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 210000003462 vein Anatomy 0.000 claims description 3
- 238000013459 approach Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 230000028527 righting reflex Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
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- 238000010224 classification analysis Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
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- 238000010891 electric arc Methods 0.000 description 1
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The present invention relates to a kind of localization methods of overhead line DC transmission system DC short trouble, belong to technical field of direct current power transmission.In the signal injection DC power transmission line that multiple distributed signal generating means generate；Signal receiving detection device detects reflection wave signal by DC power transmission line；Data processing terminal analyzes the characteristic of the reflection wave signal, judges whether DC power transmission line breaks down according to one group of reflection wave signal, and passes through coupled operational and determine that position occurs for failure.The detection of distributed multiple-pulse source coupling fault and localization method and traditional single sided pulse bounce technique compare fault-free detection and fault location blind area, remained to when clock breaks down effectively and reliably to the HVDC transmission line based on overhead line in all kinds of failures of arbitrary point differentiate.
Description
Technical field
The present invention relates to technical field of direct current power transmission, more particularly to a kind of overhead line DC transmission system DC short trouble
Localization method.
Background technology
With growing and Grid the continuous expansion of electricity needs, long-distance and large-capacity power transmission circuit constantly increases
Add, ac transmission has the shortcomings that apparent in super-pressure long distance power transmission.D.C. high voltage transmission is relative to high-voltage AC transmission
It has a clear superiority, line loss is small, transmission capacity is big, operation stability is high, power regulation is flexible.The country has put into operation at present
High voltage direct current transmission project have：Shanghai Nanhui demonstration project, Nan'ao engineering, Zhoushan engineering and Xiamen engineering etc..These engineerings
All using cable power transmission, but compared with overhead line, cable cost is high, and failure is mostly permanent, not easy to overhaul and maintenance.Institute
HVDC Transmission Technology is expanded to the trend that overhead line transmission of electricity occasion is power grid future development.
DC power transmission line is the channel of DC transmission system power transmission.DC power transmission line distance, across area
Geography, weather environment it is complicated, the probability to break down is big.Since DC power transmission line may browse mountain area, shaft tower span
The arc that hangs down farther out with conducting wire is larger, easily because conductor galloping occurs for wind or position offset is short out so as to cause DC transmission line
Road.For distant-range high voltage direct current circuit, usually using line-to-ground short circuit failure as most commonly seen fault type.Directly
Flow Line shorted to earth failure occur when, if do not taken corresponding measure to eliminate fault current, then trouble point generation electric arc one
As be difficult to self-extinguish, can then cause straight-flow system stoppage in transit serious consequence.Since DC transmission system transimission power is big, line
Road, which is broken down, to cause whole system very big impact.Therefore, to ensure power system security reliability service, it is desirable that necessary
The position that determining fault type as fast as possible and failure occur, quickly to cut off failure.
At present, it after line failure, needs to search abort situation along electrical power line inspector to scene, is then isolated, excludes
Failure.This method that failure is found by artificial line walking, required recovery time is considerably long, and often to wait until to develop into
After serious short trouble, it could find and remove, it is difficult to adapt to the new demand of intelligent grid automatization level；And due to
The quick acting of protective relaying device so that for most of faulty line there is no apparent damage trace, this results in power transmission line
The lookup of road failure becomes extremely difficult.In recent years, the D.C. high voltage transmission of overhead line is quickly grown, the failure kind on overhead line
Class and failure probability are consequently increased, and the inaccuracy of line fault point location will extend maintenance time, so as to extension wire
Power-off time causes serious economic loss.Therefore, failure high pressure occurred in remote DC power transmission line carries out reliable
Quickly positioning is significant to shortening fault correction time, reduction loss of outage, the working strength of mitigation patrol officer, and
And it can preferably ensure the reliability of power grid power supply and the stability of operation of power networks.In addition, by continuous on-line checking simultaneously
It is recorded, moreover it is possible to it is for statistical analysis to the type and position of failure, it determines failure railroad section occurred frequently, is prevented in advance
And processing.
Invention content
The purpose of the present invention is to provide a kind of localization methods of overhead line DC transmission system DC short trouble, solve
The above problem of the existing technology.The present invention is proposed to be examined suitable for overhead line direct current transportation long-distance transmission line failure
The distributed multiple-pulse source coupling fault detection with positioning and the new method of positioning are surveyed, multiple distributed signal generating means are produced
In raw signal injection DC power transmission line, reflection wave signal is detected from DC power transmission line by signal receiving detection device,
Data processing terminal analyzes the feature of the reflection wave signal, judges whether DC power transmission line is sent out according to one group of reflection wave signal
Raw failure, and pass through coupled operational and determine that position occurs for failure.The present invention considers the transmission of electricity of practical remote high voltage direct current overhead line
The characteristics of circuit analyzes the advantage and disadvantage of all kinds of travelling wave ranging methods and used for reference, it is proposed that a kind of based on pulse reflection method
Distributed multiple-pulse source coupling fault localization method.In a kind of original Method of Traveling Wave Fault Ranging applied to AC system
On the basis of, the present invention by distributed thought introduce traveling wave method, by distributed couplings operation improve travelling wave ranging method can
By property and range accuracy, the distribution mode therein for focusing on distributed traveling wave method, coupled operational two sides of algorithm research
Face.
The above-mentioned purpose of the present invention is achieved through the following technical solutions：
The localization method of overhead line DC transmission system DC short trouble, what multiple distributed signal generating means generated
In signal injection DC power transmission line；Signal receiving detection device detects reflection wave signal by DC power transmission line；At data
The characteristic of reflection wave signal described in terminal analysis is managed, judges whether DC power transmission line occurs event according to one group of reflection wave signal
Barrier, and pass through coupled operational and determine that position occurs for failure.Include the following steps：
In the signal injection DC power transmission line that the multiple distributed signal generating means of step (1) generate, the signal hair
Generating apparatus (S1,S2...,SN) the multiple positions of DC power transmission line are distributed in, the distributed signal generating means generates week respectively
Phase is the cyclic pulse signal P, the signal generation apparatus (S of T1,S2...,SN) set of pulses is generated in period of time T
Signal P, tn+ mT moment SNTo DC power transmission line injected pulse Pmn(m, n >=0, n≤N-1, m, n ∈ R), corresponding reflection
Wave is Rmn；
The each signal generation apparatus of step (2) is equipped with a signal receiving detection device to detect reflection wave signal Rmn；
Step (3) data processing terminal analyzes the characteristic of reflection wave signal, to the back wave { R receivedmnCarry out it is unusual
Point identification, determines back wave { RmnReceiving time tmn, judge whether DC power transmission line occurs according to one group of reflection wave signal
Failure, and pass through coupled operational and determine that position occurs for failure.
The coupling fault detection of distributed multiple-pulse source is required with localization method in 3 points of transmission line of electricity and more than different location
Clock is set and waveform acquisition equipment is set at clock, the position in these distributed pulse sources is not limited to circuit first and last
End and midpoint could be provided as any position and once setting failure distribution multiple-pulse coupling fault detection method are certain,
Ranging formula is also certain.
The distributed pulse source collected waveform of subsidiary waveform acquisition equipment be sent in real time data processing terminal first into
Row time normalizing overlap-add procedure finally judges fault type according to data processing terminal and provides abort situation.
The beneficial effects of the present invention are：The coupling fault detection of distributed multiple-pulse source and localization method and the single-ended arteries and veins of tradition
Rush bounce technique compare fault-free detection with fault location blind area, remained to when clock breaks down effectively and reliably to being based on
All kinds of failures of arbitrary point are differentiated in the HVDC transmission line of overhead line.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and forms the part of the application, this hair
Bright illustrative example and its explanation do not constitute improper limitations of the present invention for explaining the present invention.
Fig. 1 is distributed multiple-pulse source coupling fault detection and three pulse source model of localization method；
Fig. 2 is distributed multiple-pulse source coupling fault detection and four pulse source model of localization method；
Fig. 3 is three clock 750km short circuit waveforms；
Fig. 4 is three clock 250km short circuit waveforms；
Fig. 5 is three clock 500km short circuit waveforms；
Fig. 6 is three clock 750km through 100 Ω impedance earth waveforms；
Fig. 7 is three clock 750km through 50 Ω impedance earth waveforms；
Fig. 8 is grounded waveform for three clock 750km through 1000 Ω；
Fig. 9 is grounded waveform for three clock 750km through 500 Ω；
Figure 10 is grounded waveform for three clock 750km through wave impedance；
Figure 11 is three clock 250km through 1000 Ω impedance earth waveforms；
Figure 12 is grounded waveform for three clock 250km through wave impedance；
Figure 13 is three clock 250km through 50 Ω impedance earth waveforms；
Figure 14 is grounded waveform for three clock 500km through 1000 Ω；
Figure 15 is grounded waveform for three clock 500km through wave impedance；
Figure 16 is grounded waveform for three clock 500km through 50 Ω.
Specific embodiment
The detailed content and its specific embodiment further illustrated the present invention below in conjunction with the accompanying drawings.
Referring to shown in Fig. 1 to Figure 16, the localization method of overhead line DC transmission system DC short trouble of the invention is more
In the signal injection DC power transmission line that a distributed signal generating means generates；Signal receiving detection device passes through direct current transportation
Wireline inspection reflection wave signal；Data processing terminal analyzes the characteristic of the reflection wave signal, is sentenced according to one group of reflection wave signal
Whether disconnected DC power transmission line breaks down, and passes through coupled operational and determine that position occurs for failure.It is as follows：
In the signal injection DC power transmission line that the multiple distributed signal generating means of step (1) generate, the signal hair
Generating apparatus (S1,S2...,SN) the multiple positions of DC power transmission line are distributed in, the distributed signal generating means generates week respectively
Phase is the cyclic pulse signal P, the signal generation apparatus (S of T1,S2...,SN) set of pulses is generated in period of time T
Signal P, tn+ mT moment SNTo DC power transmission line injected pulse Pmn(m, n >=0, n≤N-1, m, n ∈ R), corresponding reflection
Wave is Rmn；
The each signal generation apparatus of step (2) is equipped with a signal receiving detection device to detect reflection wave signal Rmn；
Step (3) data processing terminal analyzes the characteristic of reflection wave signal, to the back wave { R receivedmnCarry out it is unusual
Point identification, determines back wave { RmnReceiving time tmn, judge whether DC power transmission line occurs according to one group of reflection wave signal
Failure, and pass through coupled operational and determine that position occurs for failure.
The coupling fault detection of distributed multiple-pulse source is required with localization method in 3 points of transmission line of electricity and more than different location
Clock is set and waveform acquisition equipment is set at clock, the position in these distributed pulse sources is not limited to circuit first and last
End and midpoint could be provided as any position and once setting failure distribution multiple-pulse coupling fault detection method are certain,
Ranging formula is also certain.
The distributed pulse source collected waveform of subsidiary waveform acquisition equipment be sent in real time data processing terminal first into
Row time normalizing overlap-add procedure finally judges fault type according to data processing terminal and provides abort situation.Fig. 1 is
Distributed three clock simulation models, each clock distributing position are circuit first and last end and midpoint.Fig. 2 is distribution like clock
First and last end averaging type structure can be used in simulation model, each clock distributing position.
Embodiment：
The detection of distributed multiple-pulse source coupling fault and the short trouble of localization method are emulated, transmission line of electricity is away from the
Waveform at one pulse, that is, head end clock 750km during generation short trouble is as shown in figure 3, in 0s:0.01s、0.01s:0.02s
And 0.02s:There are an apparent back reflection wave, 0.01s in 0.03s sections:0.02s and 0.02s:It is sent out in 0.03s sections
The time difference for going out pulse and echo approaches, and 0s:The time difference for sending out pulse and echo in 0.01s is then significantly greater than another two
Time difference in time zone.
Fig. 4 be transmission line of electricity away from the first clock, that is, head end clock 250km at generation short trouble when waveform, it is similar
, the first echo is significantly back reflection wave in first three 0.01s section, and 0.02s:0.03s and 0.01s:0.02s areas
In send out pulse and the time difference of echo approaches, and 0s:The time difference maximum for sending out pulse and echo in 0.01s.
When transmission line of electricity goes out short trouble occurs away from the first clock, that is, head end clock 500km, waveform such as Fig. 5 institutes
Show.0s:0.01s and 0.02s:Back reflection wave, 0.01s are collected in 0.03s sections:Voltage is continuously 0 in 0.02s, and
0s:0.01 and 0.02s:The time difference that pulse and echo are sent out in 0.03s sections approaches.In actual motion, ground connection event occurs
Can all there be either large or small impedance during barrier, therefore the emulation for circuit occurring impedance earth failure is essential with studying.Below
To distributed multiple-pulse source coupling fault detection and localization method is utilized remote DC power transmission line to occur impedance earth event
Barrier is emulated.
It is 100 that Fig. 6, Fig. 7, which are respectively transmission line of electricity away from impedance ground occurs at the first clock i.e. head end clock 750km,
Oscillogram when Ω, 50 Ω impedance earth failures.
When transmission line of electricity away from the first clock, that is, head end clock 750km occur impedance ground for 100 Ω, 50 Ω impedances
During earth fault, common ground is in 0s:0.01s、0.01s:0.02s and 0.02s:There is back reflection wave in 0.03s sections,
0.01s:0.02s and 0.02s:The time difference that pulse and echo are sent out in 0.03s sections approaches, and 0s:Sending out in 0.01s
The time difference of pulse and echo is then significantly greater than the time difference in another two time zone.These features and generation at 750km are short
Road failure is similar, and difference is that the smaller reflex amplitude of impedance ground is bigger, and reflex amplitude is maximum when short-circuit.
Transmission line of electricity is 1000 Ω, 500 Ω impedances away from impedance ground occurs at the first clock, that is, head end clock 750km
Earth fault and oscillogram during through 234.5 Ω impedance earth failures are respectively Fig. 8:Figure 10.
Transmission line of electricity is 1000 Ω, 500 Ω impedances away from impedance ground occurs at the first clock, that is, head end clock 750km
The common ground of earth fault waveform is has righting reflex wave, 0.01s in three 0.01s sections:0.02s and 0.02s:
The time difference that pulse and echo are sent out in 0.03s sections approaches, and 0s:The time difference for sending out pulse and echo in 0.01s is most
Greatly.
Similar, transmission line of electricity is 1000 Ω, 50 away from impedance ground occurs at the first clock, that is, head end clock 250km
Its common ground of oscillogram during Ω impedance earth failures is in 0s:0.01s、0.01s:0.02s and 0.02s:In 0.03s sections
There are apparent back wave, 0s:0.01s and 0.01s:The time difference that pulse and echo are sent out in 0.02s sections approaches, and 0.02s:
The time difference for sending out pulse and echo in 0.03s is then significantly greater than the time difference in another two time zone.Difference is ground connection
Resistance is is righting reflex wave in 1000 Ω, tri- sections, and impedance ground is then back reflection wave on the contrary when being 50 Ω, such as
Shown in Figure 11, Figure 12.When impedance ground occurs as the i.e. 234.5 Ω impedance earth failures of wave impedance at 250km, clock sends out arteries and veins
Back wave can not be detected after rushing signal, as shown in figure 13.
Such as Figure 14:Shown in 16, transmission line of electricity is wave away from impedance ground occurs at the first clock, that is, head end clock 500km
The oscillogram rule of impedance earth short circuit occurs with other positions for oscillogram when impedance, 1000 Ω, 50 Ω impedance earth failures
It is similar.Difference is in 0s:0.01s、0.01s:0.02s and 0.02s:The time of pulse and echo is sent out in 0.03s sections
Difference is equal.When impedance ground occurs as the i.e. 234.5 Ω impedance earth failures of wave impedance at 250km, clock sends out pulse signal
After can not detect back wave.
Classification analysis is carried out to more than simulation figure to understand：It is detected and positioning when using distributed multiple-pulse source coupling fault
When method carries out fault detect with ranging to transmission line malfunction, it can be acquired when short circuit and small impedance earth short circuit occur for circuit
To back reflection wave, righting reflex wave, the amplitude of back wave can be collected when open circuit and big impedance earth failure occur for circuit
It is related with fault type and impedance ground, when short circuit occurs for circuit different location, pulse and reflection are sent out in each 0.01s
The wave time difference is different.
Faulty line is cut off after the action of protective relaying device, is detected and positioned using distributed multiple-pulse source coupling fault
During method, open fault occurs for the breaker installation point being considered as in protective relaying device, and former fault point still keeps cause to hinder.This
The distributed multiple-pulse source coupling fault detection that text proposes can monitor the failure of transmission line of electricity on-line with localization method
And offline inspection.
By emulation and above-mentioned analysis, the pass of pulse and reflected impulse is sent out in each time cycle in waveform by comparing
System, distribution multiple-pulse source coupling fault detection proposed in this paper can carry out the different faults of transmission line of electricity with localization method
Effective detection and positioning.
The foregoing is merely the preferred embodiments of the present invention, are not intended to restrict the invention, for the technology of this field
For personnel, the invention may be variously modified and varied.All any modification, equivalent substitution, improvement and etc. made for the present invention,
It should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of localization method of overhead line DC transmission system DC short trouble, it is characterised in that：Multiple distributed signals
In the signal injection DC power transmission line that generating means generates；Signal receiving detection device is detected by DC power transmission line to be reflected
Wave signal；Data processing terminal analyzes the characteristic of the reflection wave signal, judges DC transmission line according to one group of reflection wave signal
Whether road breaks down, and passes through coupled operational and determine that position occurs for failure.
2. the localization method of overhead line DC transmission system DC short trouble according to claim 1, it is characterised in that：
Include the following steps：
In the signal injection DC power transmission line that the multiple distributed signal generating means of step (1) generate, the signal fills
Put (S1,S2...,SN) it is distributed in the multiple positions of DC power transmission line, the distributed signal generating means generates the period and is respectively
The cyclic pulse signal P, the signal generation apparatus (S of T1,S2...,SN) set of pulses signal is generated in period of time T
P, tn+ mT moment SNTo DC power transmission line injected pulse Pmn(m, n >=0, n≤N-1, m, n ∈ R), corresponding back wave is
Rmn；
The each signal generation apparatus of step (2) is equipped with a signal receiving detection device to detect reflection wave signal Rmn；
Step (3) data processing terminal analyzes the characteristic of reflection wave signal, to the back wave { R receivedmnCarry out singular point knowledge
Not, back wave { R is determinedmnReceiving time tmn, judge whether DC power transmission line occurs event according to one group of reflection wave signal
Barrier, and pass through coupled operational and determine that position occurs for failure.
3. the localization method of overhead line DC transmission system DC short trouble according to claim 1 or 2, feature exist
In：The coupling fault detection of distributed multiple-pulse source is with localization method requirement in 3 points of transmission line of electricity and more than different location setting arteries and veins
Rush source and waveform acquisition equipment be set at clock, the position in these distributed pulse sources be not limited to circuit first and last end and in
Point could be provided as any position and once setting failure distribution multiple-pulse coupling fault detection method be certain, and ranging is public
Formula is also certain.
4. the localization method of overhead line DC transmission system DC short trouble according to claim 1 or 2, feature exist
In：The distributed pulse source collected waveform of subsidiary waveform acquisition equipment is sent to data processing terminal and carries out the time first in real time
Normalizing overlap-add procedure finally judges fault type according to data processing terminal and provides abort situation.
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| CN201711476863.6A CN108169612A (en) | 2017-12-29 | 2017-12-29 | The localization method of overhead line DC transmission system DC short trouble |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609206A (en) * | 2019-08-21 | 2019-12-24 | 北京四方继保自动化股份有限公司 | Fault identification method for high-voltage direct-current transmission system |
| CN112557951A (en) * | 2020-12-10 | 2021-03-26 | 中国科学院合肥物质科学研究院 | On-line monitoring device of grounding system |
| CN113671320A (en) * | 2021-09-13 | 2021-11-19 | 重庆华网智能传感器研究院股份有限公司 | Power line fault hidden danger monitoring device and working method thereof |
| CN115856525A (en) * | 2022-11-08 | 2023-03-28 | 武汉朗德电气有限公司 | Cable partial discharge online monitoring method and system |
-
2017
- 2017-12-29 CN CN201711476863.6A patent/CN108169612A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609206A (en) * | 2019-08-21 | 2019-12-24 | 北京四方继保自动化股份有限公司 | Fault identification method for high-voltage direct-current transmission system |
| CN112557951A (en) * | 2020-12-10 | 2021-03-26 | 中国科学院合肥物质科学研究院 | On-line monitoring device of grounding system |
| CN113671320A (en) * | 2021-09-13 | 2021-11-19 | 重庆华网智能传感器研究院股份有限公司 | Power line fault hidden danger monitoring device and working method thereof |
| CN115856525A (en) * | 2022-11-08 | 2023-03-28 | 武汉朗德电气有限公司 | Cable partial discharge online monitoring method and system |
| CN115856525B (en) * | 2022-11-08 | 2024-03-19 | 武汉朗德电气有限公司 | Cable partial discharge on-line monitoring method and system |
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