CN108802563A - A kind of both-end travelling wave ranging method not depending on clock synchronization - Google Patents
A kind of both-end travelling wave ranging method not depending on clock synchronization Download PDFInfo
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- CN108802563A CN108802563A CN201810319293.8A CN201810319293A CN108802563A CN 108802563 A CN108802563 A CN 108802563A CN 201810319293 A CN201810319293 A CN 201810319293A CN 108802563 A CN108802563 A CN 108802563A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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Abstract
The present invention discloses a kind of both-end travelling wave ranging method not depending on clock synchronization; travelling wave ranging module is integrated in route protection module in route protection and travelling wave ranging integrated apparatus; route protection module calculates communication channel delay and completes both sides absolute clock deviation and calculates in real time; both sides travelling wave ranging module calculates and checks the absolute clock difference that the initial traveling wave of failure reaches both sides, to realize the both-end travelling wave ranging for not depending on clock synchronization.Such method carries out calculating communication channel delay and both sides absolute clock deviation by route protection function, realizes the both-end travelling wave ranging for not depending on clock synchronization, improves the practicability and reliability of both-end travelling wave ranging, and engineering is easily realized.
Description
Technical field
The present invention relates to a kind of both-end travelling wave ranging methods not depending on clock synchronization, belong to Relay Protection Technology in Power System neck
Domain.
Background technology
Currently, travelling wave ranging method is the novel method for carrying out fault localization using current or voltage traveling wave, it can be effective
Overcome the defect of Conventional impedance distance measuring method, having is not influenced by CT saturation, do not influenced by system oscillation, do not grown
Unique advantages such as line distribution capacity influence, are widely used.
Existing, travelling wave ranging method is divided into both-end method and single-ended method, and single-ended method only needs that measurement point is arranged at one end, not by
Communication condition limits, and difficult point is accurately to differentiate the corresponding reflected traveling wave of each traveling wave；Both-end method is generated first using failure
The absolute time difference when wave that begins reaches circuit both ends measurement point carries out fault localization, its advantage is that it is easy to operate, the disadvantage is that needing
The GPS signal will be accurate and stablized.
Chinese Patent Application No. CN201610333220.5, May 19 2016 applying date, publication number
CN105866631A, publication date August in 2016 17 days, a kind of entitled novel double end travelling wave ranging based on fuzzy matching
Method.When singlephase earth fault occurs for alternating current circuit, the invention is according to circuit both sides current traveling wave data, using wavelet transformation
The wave of detection and calibration fault traveling wave obtains wave then difference sequence Δ T to the momentmWith Δ Tn；Secondly, to Δ TmWith Δ TnIt carries out
Normalization, and seek distance between the two；Then, degree of membership is sought, determines most matched a pair of of moment；Finally, according to most
At matched a pair of moment, calculate fault distance and asynchronous time Δ t.The invention mathematical processes are complicated, are not suitable for real
Border engineer application.
Invention content
Purpose：In order to overcome the deficiencies in the prior art, the present invention to provide a kind of both-end traveling wave not depending on clock synchronization
Distance measuring method realizes the travelling wave ranging for not depending on clock synchronization by the both sides Clock Synchronization Technology of route protection function, improves both-end
The reliability of travelling wave ranging, and engineering is easily realized.
Technical solution：In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of both-end travelling wave ranging method not depending on clock synchronization, includes the following steps：
Step 1, travelling wave ranging module is integrated in route protection module in route protection and travelling wave ranging integrated apparatus,
Route protection module and travelling wave ranging module carry out the sampling of power frequency amount and high frequency transient sampling respectively simultaneously, and route protection module is sentenced
It is disconnected whether troubles inside the sample space to occur；
Step 2, route protection module calculates communication channel delay t in real timed, and calculate the deviation delta t of both sides absolute clockc；
Step 3, route protection module judges after troubles inside the sample space occurs that travelling wave ranging module is to the transient state that is sampled before and after failure
Traveling wave obtains modulus maximum by wavelet transformation, and determines that the initial traveling wave of failure reaches this side corresponding absolute clock moment；
Step 4, the absolute clock that travelling wave ranging module in both sides is reached by the initial traveling wave of route protection Channel Exchange failure
Moment, while reading communication channel delay tdWith the deviation delta t of both sides absolute clockc, both sides are reached to obtain the initial traveling wave of failure
Absolute clock difference DELTA t, and check whether absolute clock difference DELTA t can be used；
Step 5, travelling wave ranging module in both sides is carried out according to available absolute clock difference DELTA t using both-end traveling wave algorithm
Travelling wave ranging.
Preferably, circuit protection module and travelling wave ranging module are based on same internal clocking reality in the step 1
Now sample simultaneously.
Preferably, circuit protection module calculates communication channel delay t in real time in the step 2dUsing former based on table tennis
The communication channel delay measuring technique of reason is realized；It is respectively host and slave to set both sides protective device, and host is in tm1Moment to from
Machine sends host current time index and calculates communication channel delay tdOrder；Slave receives the t that is delayed after ordermWhen time is current by slave
Mark and delay time tmIt is passed back to host；Host is t at the time of receiving loopback messager2, calculating communication channel delay is：
Preferably, the deviation delta t of both sides absolute clock is calculated in the step 2cUsing based on data channel
Clock adjusting method is realized；It sets using the absolute clock of host as both sides clock, host is at current this side moment tmjTo include logical
Road delay tdBe sent to slave with the frame information including absolute clock deviation calculation command, slave according to receive the information when
Carve tr3, host delivery time tmjAnd td, calculate host and slave processors absolute clock deviation delta tc：
Δtc=tmj-(tr3-td)。
Preferably, both-end travelling wave ranging module obtains the initial traveling wave of failure and reaches the exhausted of both sides in the step 4
Method to clock difference Δ t is：It is corresponding absolutely to set the initial traveling wave modulus maximum of the counted failure of both sides integrated apparatus
Clock time is respectively tmcAnd tnc, this moment is sent to offside respectively, basis is logical after both sides integrated apparatus receives corresponding frame
Road delay tdWith the deviation delta t of both sides absolute clockcIt return back to and corresponding absolute clock moment tmcnAnd tncm, enable the sides M as master
Machine, the sides N are slave, for the sides M, tmcnIt is the absolute moment t of the sides MmcConvert the absolute time of the sides N, tmcn=tmc-Δtc；tncm
It is the absolute moment t of the sides NncConvert the absolute time t of the sides Mncm=tnc+Δtc, both sides are each by comparing t at this timemcWith tncm
And tncWith tmcnDeviation to get the absolute clock difference DELTA t of both sides is reached to the initial traveling wave of both sides failure, for the failure of the sides M
Absolute clock difference DELTA t, is calculated as Δ tmn=tmc-tncm, for the failure absolute clock difference DELTA t of the sides N, it is calculated as Δ tnm=
tnc-tmcn。
Preferably, the whether available methods of absolute clock difference DELTA t are checked in the step 4 is：Both sides are respectively
The absolute value of absolute clock difference should be not more than line length divided by the value of traveling wave speed, i.e.,Wherein L is that circuit is long
Degree, v is traveling wave speed.
Preferably, travelling wave ranging module is using both-end traveling wave algorithm in the step 5：
Wherein, L is line length, and v is traveling wave speed, for host computer side Δ t=Δs tmn, for from pusher side Δ t=Δs
tnm, DFFor the distance of fault point distance protection installation place.
Advantageous effect：A kind of both-end travelling wave ranging method not depending on clock synchronization provided by the invention, by both-end travelling wave ranging
Function is integrated in route protection function in a device, calculates communication channel delay by means of route protection and both sides absolute clock is inclined
Difference improves the practicability and reliability of both-end travelling wave ranging to realize the both-end travelling wave ranging for not depending on clock synchronization, is suitble to real
Border engineer application.
Description of the drawings
Fig. 1 is the system block diagram for realizing the both-end travelling wave ranging method for not depending on clock synchronization；
Fig. 2 is the flow chart for the both-end travelling wave ranging method for not depending on clock synchronization；
Fig. 3 is that circuit both sides communication channel delay calculates and both sides absolute clock deviation schematic diagram calculation；
Fig. 4 is the schematic diagram calculated the circuit both sides travelling wave ranging failure time difference.
Specific implementation mode
The present invention is further described below in conjunction with the accompanying drawings.
As shown in Figure 1, the both sides circuit AB are route protection and travelling wave ranging integrated apparatus in system, device by CT and
PT accesses analog quantity, and both sides device is connected by optical-fibre channel, exchange protection and travelling wave ranging information.
A kind of both-end travelling wave ranging method not depending on clock synchronization, as shown in Fig. 2, include the following steps,
Step 1, travelling wave ranging module is integrated in route protection module in route protection and travelling wave ranging integrated apparatus,
Route protection module and travelling wave ranging module carry out the sampling of power frequency amount and high frequency transient sampling respectively simultaneously, and route protection module is sentenced
It is disconnected whether troubles inside the sample space to occur.
It realizes while sampling specifically, route protection module and travelling wave ranging module are based on same internal clocking.
Step 2, route protection module calculates communication channel delay t in real timed, and calculate the deviation delta t of both sides absolute clockc.Specifically
, the route protection module calculates communication channel delay t in real timedUsing the communication channel delay measuring technique based on pingpong theory come real
It is existing；As shown in figure 3, setting both sides protective device is respectively host and slave, host is in tm1Moment is current to slave transmission host
Markers and calculating communication channel delay tdOrder；Slave receives the t that is delayed after ordermTime is by slave current time index and delay time tm
It is passed back to host；Host is t at the time of receiving loopback messager2, calculating communication channel delay is：
Specifically, the deviation delta t for calculating both sides absolute clockcUsing the clock adjusting method based on data channel come real
It is existing；As shown in figure 3, setting using the absolute clock of host as both sides clock, host is at current this side moment tmjIt will prolong including channel
When tdIt is sent to slave with the frame information including absolute clock deviation calculation command, at the time of slave is according to the information is received
tr3, host delivery time tmjAnd td, calculate host and slave processors absolute clock deviation delta tc：
Δtc=tmj-(tr3-td)
Step 3, route protection module judges after troubles inside the sample space occurs that travelling wave ranging module is to the transient state that is sampled before and after failure
Traveling wave obtains modulus maximum by wavelet transformation, and determines that the initial traveling wave of failure reaches this side corresponding absolute clock moment.
Step 4, the absolute clock that travelling wave ranging module in both sides is reached by the initial traveling wave of route protection Channel Exchange failure
Moment, while reading communication channel delay tdWith the deviation delta t of both sides absolute clockc, both sides are reached to obtain the initial traveling wave of failure
Absolute clock difference DELTA t, and check whether absolute clock difference DELTA t can be used.
As shown in figure 4, both-end travelling wave ranging module obtains the absolute clock difference DELTA t's of failure initial traveling wave arrival both sides
Method is：It is respectively t to set the initial traveling wave modulus maximum of the counted failure of the both sides integrated apparatus corresponding absolute clock momentmc
And tnc, this moment is sent to offside respectively, both sides integrated apparatus receives after corresponding frame according to communication channel delay tdIt is exhausted with both sides
To the deviation delta t of clockcIt return back to and corresponding absolute clock moment tmcnAnd tncm, enable the sides M as host, the sides N are slave, right
In the sides M, tmcnIt is the absolute moment t of the sides MmcConvert the absolute time of the sides N, tmcn=tmc-Δtc；As shown in Figure 4：tncmIt is the sides N
Absolute moment tncConvert the absolute time t of the sides Mncm=tnc+Δtc, both sides are each by comparing t at this timemcWith tncmAnd tnc
With tmcnDeviation to get reaching the absolute clock difference DELTA t of both sides to the initial traveling wave of both sides failure, it is absolute for the failure of the sides M
Clock difference Δ t, is calculated as Δ tmn=tmc-tncm, for the failure absolute clock difference DELTA t of the sides N, it is calculated as Δ tnm=tnc-
tmcn。
Checking the whether available methods of absolute clock difference DELTA t is：The absolute value of the respective absolute clock difference in both sides should not
More than line length divided by the value of traveling wave speed, i.e.,Wherein L is line length, and v is traveling wave speed.
Step 5, travelling wave ranging module in both sides is carried out according to available absolute clock difference DELTA t using both-end traveling wave algorithm
Travelling wave ranging.
Travelling wave ranging module is using both-end traveling wave algorithm：
Wherein, L is line length, and v is traveling wave speed, for host computer side Δ t=Δs tmn, for from pusher side Δ t=Δs
tnm, DFFor the distance of fault point distance protection installation place.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of both-end travelling wave ranging method not depending on clock synchronization, it is characterised in that：Include the following steps：
Step 1, travelling wave ranging module is integrated in route protection module in route protection and travelling wave ranging integrated apparatus, circuit
Protection module and travelling wave ranging module carry out the sampling of power frequency amount and high frequency transient sampling respectively simultaneously, and the judgement of route protection module is
No generation troubles inside the sample space；
Step 2, route protection module calculates communication channel delay t in real timed, and calculate the deviation delta t of both sides absolute clockc；
Step 3, route protection module judges after troubles inside the sample space occurs that travelling wave ranging module is to the transient state travelling wave that is sampled before and after failure
Modulus maximum is obtained by wavelet transformation, and determines that the initial traveling wave of failure reaches this side corresponding absolute clock moment；
Step 4, the absolute clock moment that travelling wave ranging module in both sides is reached by the initial traveling wave of route protection Channel Exchange failure,
Read communication channel delay t simultaneouslydWith the deviation delta t of both sides absolute clockc, the absolute of both sides is reached to obtain the initial traveling wave of failure
Clock difference Δ t, and check whether absolute clock difference DELTA t can be used；
Step 5, travelling wave ranging module in both sides carries out traveling wave according to available absolute clock difference DELTA t using both-end traveling wave algorithm
Ranging.
2. a kind of both-end travelling wave ranging method not depending on clock synchronization according to claim 1, it is characterised in that：The step
Circuit protection module and travelling wave ranging module are based on the realization of same internal clocking while sampling in 1.
3. a kind of both-end travelling wave ranging method not depending on clock synchronization according to claim 1, it is characterised in that：The step
Circuit protection module calculates communication channel delay t in real time in 2dIt is realized using the communication channel delay measuring technique based on pingpong theory；If
It is respectively host and slave to determine both sides protective device, and host is in tm1Moment sends host current time index and calculate channel to slave to be prolonged
When tdOrder；Slave receives the t that is delayed after ordermTime is by slave current time index and delay time tmIt is passed back to host；Host is received
To at the time of loopback message be tr2, calculating communication channel delay is：
4. a kind of both-end travelling wave ranging method not depending on clock synchronization according to claim 1, it is characterised in that：The step
The deviation delta t of both sides absolute clock is calculated in 2cIt is realized using the clock adjusting method based on data channel；Setting is with host
Absolute clock is both sides clock, and host is at current this side moment tmjTo include communication channel delay tdWith absolute clock deviation calculation command
A frame information inside is sent to slave, and slave is according to t at the time of receiving the informationr3, host delivery time tmjAnd td, calculate
Host and slave processors absolute clock deviation delta tc：
Δtc=tmj-(tr3-td)。
5. a kind of both-end travelling wave ranging method not depending on clock synchronization according to claim 1, it is characterised in that：The step
The method that both-end travelling wave ranging module obtains the absolute clock difference DELTA t that the initial traveling wave of failure reaches both sides in 4 is：Set both sides
The initial traveling wave modulus maximum of the counted failure of the integrated apparatus corresponding absolute clock moment is respectively tmcAnd tnc, respectively by this
Moment is sent to offside, and both sides integrated apparatus receives after corresponding frame according to communication channel delay tdWith the deviation delta of both sides absolute clock
tcIt return back to and corresponding absolute clock moment tmcnAnd tncm, enable the sides M as host, the sides N are slave, for the sides M, tmcnIt is the sides M
Absolute moment tmcConvert the absolute time of the sides N, tmcn=tmc-Δtc；tncmIt is the absolute moment t of the sides NncConvert the sides M
Absolute time tncm=tnc+Δtc, both sides are each by comparing t at this timemcWith tncmAnd tncWith tmcnDeviation to get to both sides therefore
The absolute clock difference DELTA t for hindering initial traveling wave arrival both sides is calculated as Δ t for the failure absolute clock difference DELTA t of the sides Mmn=
tmc-tncm, for the failure absolute clock difference DELTA t of the sides N, it is calculated as Δ tnm=tnc-tmcn。
6. a kind of both-end travelling wave ranging method not depending on clock synchronization according to claim 1, it is characterised in that：The step
The whether available methods of absolute clock difference DELTA t are checked in 4 is：The absolute value of the respective absolute clock difference in both sides should be not more than line
The value of road length divided by traveling wave speed, i.e.,Wherein L is line length, and v is traveling wave speed.
7. a kind of both-end travelling wave ranging method not depending on clock synchronization according to claim 1, it is characterised in that：The step
Travelling wave ranging module is using both-end traveling wave algorithm in 5：
Wherein, L is line length, and v is traveling wave speed, for host computer side, Δ t=Δs tmn, for from pusher side Δ t=Δs tnm, DF
For the distance of fault point distance protection installation place.
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Cited By (6)
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| CN110346690A (en) * | 2019-08-15 | 2019-10-18 | 广东电网有限责任公司 | Sea cable fault localization system and method based on fiber pulse transmission |
| CN110514963A (en) * | 2019-09-05 | 2019-11-29 | 国网内蒙古东部电力有限公司检修分公司 | A kind of improvement both-end Method of Traveling Wave Fault Ranging |
| CN110927514A (en) * | 2019-11-06 | 2020-03-27 | 国网陕西省电力公司 | Traveling wave distance measurement system and method suitable for hybrid power transmission line |
| CN111896838A (en) * | 2020-07-10 | 2020-11-06 | 国网安徽省电力有限公司亳州供电公司 | Double-end traveling wave fault location method based on information characteristic identification |
| CN112763837A (en) * | 2019-11-01 | 2021-05-07 | 国电南瑞科技股份有限公司 | Double-end traveling wave ranging method for clock self-adaptive compensation |
| CN114152837A (en) * | 2020-09-08 | 2022-03-08 | 南京南瑞继保电气有限公司 | Wave head identification method and device under multi-scale wavelet transform |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110346690A (en) * | 2019-08-15 | 2019-10-18 | 广东电网有限责任公司 | Sea cable fault localization system and method based on fiber pulse transmission |
| CN110346690B (en) * | 2019-08-15 | 2021-08-03 | 广东电网有限责任公司 | Submarine cable fault distance measurement system and method based on optical fiber pulse transmission |
| CN110514963A (en) * | 2019-09-05 | 2019-11-29 | 国网内蒙古东部电力有限公司检修分公司 | A kind of improvement both-end Method of Traveling Wave Fault Ranging |
| CN110514963B (en) * | 2019-09-05 | 2021-08-17 | 国网内蒙古东部电力有限公司检修分公司 | Improved double-end traveling wave fault location method |
| CN112763837A (en) * | 2019-11-01 | 2021-05-07 | 国电南瑞科技股份有限公司 | Double-end traveling wave ranging method for clock self-adaptive compensation |
| CN112763837B (en) * | 2019-11-01 | 2023-04-14 | 国电南瑞科技股份有限公司 | Double-end traveling wave distance measurement method for clock self-adaptive compensation |
| CN110927514A (en) * | 2019-11-06 | 2020-03-27 | 国网陕西省电力公司 | Traveling wave distance measurement system and method suitable for hybrid power transmission line |
| CN110927514B (en) * | 2019-11-06 | 2022-01-14 | 国网陕西省电力公司 | Traveling wave distance measurement system and method suitable for hybrid power transmission line |
| CN111896838A (en) * | 2020-07-10 | 2020-11-06 | 国网安徽省电力有限公司亳州供电公司 | Double-end traveling wave fault location method based on information characteristic identification |
| CN114152837A (en) * | 2020-09-08 | 2022-03-08 | 南京南瑞继保电气有限公司 | Wave head identification method and device under multi-scale wavelet transform |
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