CN108802563B - Double-end traveling wave distance measurement method independent of time setting - Google Patents
Double-end traveling wave distance measurement method independent of time setting Download PDFInfo
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Abstract
The invention discloses a double-end traveling wave distance measurement method independent of time setting, wherein a traveling wave distance measurement module and a line protection module are integrated in a line protection and traveling wave distance measurement integrated device, the line protection module calculates channel delay in real time and completes calculation of absolute clock deviation on two sides, and the traveling wave distance measurement modules on the two sides calculate and check the absolute clock difference value when fault initial traveling waves reach the two sides, so that double-end traveling wave distance measurement independent of time setting is realized. The method calculates the channel delay and the absolute clock deviation of two sides by means of the line protection function, realizes double-end traveling wave distance measurement independent of time synchronization, improves the practicability and reliability of double-end traveling wave distance measurement, and is easy to realize engineering.
Description
Technical Field
The invention relates to a double-end traveling wave distance measurement method independent of time setting, and belongs to the technical field of relay protection of power systems.
Background
At present, the traveling wave distance measurement method is a novel method for carrying out fault distance measurement by utilizing current or voltage traveling waves, can effectively overcome the defects of the traditional impedance distance measurement method, has the unique advantages of no influence of current transformer saturation, no influence of system oscillation, no influence of long-line distributed capacitance and the like, and is widely applied.
The existing traveling wave distance measurement method is divided into a double-end method and a single-end method, the single-end method only needs to set a measurement point at one end and is not limited by communication conditions, and the difficulty is that the reflected traveling waves corresponding to the traveling waves are accurately distinguished; the double-end method utilizes the absolute time difference when the initial traveling wave generated by the fault reaches the measuring points at the two ends of the line to carry out fault location, and has the advantages of simple operation and the defect of needing accurate and stable GPS signals.
The invention discloses a novel double-end traveling wave distance measurement method based on fuzzy matching, and belongs to the Chinese patent application No. CN201610333220.5, application date 2016, 5 and 19 days, publication No. CN105866631A, and publication date 2016, 8 and 17 days. When the single-phase earth fault occurs in the AC line, the invention adopts wavelet transformation to detect and calibrate the wave arrival time of the fault traveling wave according to the current traveling wave data at two sides of the line, and obtains the wave arrival time difference sequence delta TmAnd Δ Tn(ii) a Secondly, for Δ TmAnd Δ TnNormalizing and solving the distance between the two; then, solving the membership degree and determining a pair of most matched moments; and finally, calculating the fault distance and the asynchronous time delta t according to the most matched pair of moments. The mathematical treatment process of the invention is complex and is not suitable for practical engineering application.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a double-end traveling wave distance measurement method independent of time synchronization, and by means of a two-side clock synchronization technology of a line protection function, the traveling wave distance measurement independent of time synchronization is realized, the reliability of double-end traveling wave distance measurement is improved, and the engineering is easy to realize.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a double-end traveling wave distance measurement method independent of time setting comprises the following steps:
step 1, integrating a traveling wave distance measurement module and a line protection module in a line protection and traveling wave distance measurement integrated device, simultaneously and respectively carrying out power frequency quantity sampling and high-frequency transient sampling on the line protection module and the traveling wave distance measurement module, and judging whether an in-zone fault occurs by the line protection module;
step 2, the line protection module calculates the channel delay t in real timedAnd calculating the deviation delta t of the absolute clocks at both sidesc；
Step 3, after the line protection module judges that the fault occurs in the area, the traveling wave ranging module obtains a modulus maximum value through wavelet transformation on the transient traveling wave sampled before and after the fault, and determines the absolute clock time when the initial fault traveling wave reaches the side;
step 4, the traveling wave ranging modules at two sides exchange the absolute clock time of the arrival of the initial fault traveling wave through the line protection channel, and simultaneously read the channel delay tdDeviation Δ t from both sides absolute clockcObtaining an absolute clock difference value delta t when the initial fault traveling wave reaches two sides, and checking whether the absolute clock difference value delta t is available;
and 5, the traveling wave ranging modules on the two sides use a double-end traveling wave algorithm to perform traveling wave ranging according to the available absolute clock difference value delta t.
As a preferred scheme, in step 1, the line protection module and the traveling wave ranging module implement simultaneous sampling based on the same internal clock.
As a preferred scheme, the line protection module calculates the channel delay t in real time in step 2dThe method is realized by adopting a channel delay measurement technology based on a ping-pong principle; setting the two side protection devices as a host and a slave respectively, wherein the host is at tm1Sending the current time mark of the host and the calculated channel delay t to the slave at any momentdA command of (2); delay t after slave receives commandmTime-to-slave current time scale and delay time tmReturning to the host; the time when the host receives the return information is tr2Calculating the channel delay as follows:
preferably, both sides are calculated in the step 2Deviation of absolute clock Δ tcThe method is realized by adopting a clock adjustment method based on a data channel; setting the absolute clock of the host as the clock of two sides, the host being at the current time tmjWill include the channel delay tdOne frame of information including an absolute clock deviation calculation command is sent to the slave, and the slave receives the information at the time tr3Host sending time tmjAnd tdCalculating the absolute clock deviation delta t of the master and the slavec：
Δtc＝tmj-(tr3-td)。
As a preferred scheme, the method for obtaining the absolute clock difference value Δ t of the fault initial traveling wave arriving at two sides by the double-end traveling wave ranging module in the step 4 is as follows: setting the absolute clock moments corresponding to the maximum values of the wave modes of the initial fault lines calculated by the two integrated devices at two sides as tmcAnd tncRespectively sending the moment to the opposite sides, and delaying t according to the channel after the integrated devices on the two sides receive the corresponding framesdDeviation Δ t from both sides absolute clockcBack to the corresponding absolute clock time tmcnAnd tncmLet M side be the master and N side be the slave, for M side, tmcnIs the absolute time t of the M sidemcConverted to absolute time to N side, tmcn＝tmc-Δtc；tncmIs the absolute time t of the N sidencConverted to absolute time t on the M sidencm＝tnc+ΔtcWhen both sides are compared with each other by comparison tmcAnd tncmAnd tncAnd tmcnThe error of the two-side fault initial traveling wave is obtained, namely the absolute clock difference value delta t of the two-side fault initial traveling wave reaching the two sides is obtained, and the absolute clock difference value delta t of the M-side fault is calculated to be delta tmn＝tmc-tncmFor a fault absolute clock difference Δ t on the N side, it is calculated as Δ tnm＝tnc-tmcn。
Preferably, the method for checking whether the absolute clock difference Δ t is available in step 4 is as follows: the absolute value of the difference between the respective absolute clocks at both sides should not be greater than the line length divided by the speed of the travelling wave, i.e. the absolute value
Wherein L is the line length and v is the traveling wave velocity.
As a preferred scheme, the traveling wave distance measurement module in step 5 uses a double-ended traveling wave algorithm that:
where L is the line length, v is the traveling wave velocity, and Δ t is Δ t for the host sidemnFor the slave side, Δ t is Δ tnm，DFThe distance of the point of failure from the protection installation.
Has the advantages that: the double-end traveling wave distance measurement method independent of time synchronization integrates the double-end traveling wave distance measurement function and the line protection function in one device, calculates the channel delay and the absolute clock deviation at two sides by means of line protection, thereby realizing the double-end traveling wave distance measurement independent of time synchronization, improving the practicability and reliability of the double-end traveling wave distance measurement and being suitable for practical engineering application.
Drawings
FIG. 1 is a system block diagram of a method for implementing double-ended traveling wave ranging that is time-independent;
FIG. 2 is a flow chart of a double-ended traveling wave ranging method independent of time tick;
FIG. 3 is a schematic diagram of the computation of both-side channel delay and both-side absolute clock skew of a line;
fig. 4 is a schematic diagram of the fault time difference calculation of the traveling wave ranging of two sides of the line.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in figure 1, two sides of a line AB in the system are integrated devices of line protection and traveling wave ranging, the devices are connected with analog quantity through CT and PT, and the devices on the two sides are connected through an optical fiber channel to exchange protection and traveling wave ranging information.
A double-end traveling wave ranging method independent of time setting, as shown in fig. 2, comprises the following steps,
step 1, integrating a traveling wave ranging module and a line protection module in a line protection and traveling wave ranging integrated device, simultaneously and respectively carrying out power frequency quantity sampling and high-frequency transient sampling on the line protection module and the traveling wave ranging module, and judging whether an in-area fault occurs by the line protection module.
Specifically, the line protection module and the traveling wave ranging module realize simultaneous sampling based on the same internal clock.
Step 2, the line protection module calculates the channel delay t in real timedAnd calculating the deviation delta t of the absolute clocks at both sidesc. Specifically, the line protection module calculates the channel delay t in real timedThe method is realized by adopting a channel delay measurement technology based on a ping-pong principle; as shown in FIG. 3, the two side protection devices are set as the master and the slave respectively, and the master is at tm1Sending the current time mark of the host and the calculated channel delay t to the slave at any momentdA command of (2); delay t after slave receives commandmTime-to-slave current time scale and delay time tmReturning to the host; the time when the host receives the return information is tr2Calculating the channel delay as follows:
specifically, the calculating of the deviation Δ t of the absolute clocks on both sidescThe method is realized by adopting a clock adjustment method based on a data channel; as shown in FIG. 3, the absolute clock of the host is set as the two-sided clock, and the host is at the current time tmjWill include the channel delay tdOne frame of information including an absolute clock deviation calculation command is sent to the slave, and the slave receives the information at the time tr3Host sending time tmjAnd tdCalculating the absolute clock deviation delta t of the master and the slavec：
Δtc＝tmj-(tr3-td)
And 3, after the line protection module judges that the fault occurs in the area, the traveling wave ranging module obtains a modulus maximum value by performing wavelet transformation on the transient traveling waves sampled before and after the fault, and determines the absolute clock time corresponding to the arrival of the initial fault traveling wave at the side.
Step 4, the traveling wave ranging modules at two sides exchange the absolute clock time of the arrival of the initial fault traveling wave through the line protection channel, and simultaneously read the channel delay tdDeviation Δ t from both sides absolute clockcAnd thus, obtaining the absolute clock difference value delta t of the fault initial traveling wave reaching two sides, and checking whether the absolute clock difference value delta t is available.
As shown in fig. 4, the method for obtaining the absolute clock difference Δ t of the fault initial traveling wave arriving at both sides by the double-end traveling wave ranging module is as follows: setting the absolute clock moments corresponding to the maximum values of the wave modes of the initial fault lines calculated by the two integrated devices at two sides as tmcAnd tncRespectively sending the moment to the opposite sides, and delaying t according to the channel after the integrated devices on the two sides receive the corresponding framesdDeviation Δ t from both sides absolute clockcBack to the corresponding absolute clock time tmcnAnd tncmLet M side be the master and N side be the slave, for M side, tmcnIs the absolute time t of the M sidemcConverted to absolute time to N side, tmcn＝tmc-Δtc(ii) a As shown in fig. 4: t is tncmIs the absolute time t of the N sidencConverted to absolute time t on the M sidencm＝tnc+ΔtcWhen both sides are compared with each other by comparison tmcAnd tncmAnd tncAnd tmcnThe error of the two-side fault initial traveling wave is obtained, namely the absolute clock difference value delta t of the two-side fault initial traveling wave reaching the two sides is obtained, and the absolute clock difference value delta t of the M-side fault is calculated to be delta tmn＝tmc-tncmFor a fault absolute clock difference Δ t on the N side, it is calculated as Δ tnm＝tnc-tmcn。
The method for checking whether the absolute clock difference Δ t is available is as follows: the absolute value of the difference between the respective absolute clocks at both sides should not be greater than the line length divided by the speed of the travelling wave, i.e. the absolute value
Wherein L is the line length and v is the traveling wave velocity.
And 5, the traveling wave ranging modules on the two sides use a double-end traveling wave algorithm to perform traveling wave ranging according to the available absolute clock difference value delta t.
The traveling wave ranging module adopts a double-end traveling wave algorithm that:
where L is the line length, v is the traveling wave velocity, and Δ t is Δ t for the host sidemnFor the slave side, Δ t is Δ tnm，DFThe distance of the point of failure from the protection installation.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (1)
1. A double-end traveling wave distance measurement method independent of time setting is characterized in that: the method comprises the following steps:
step 1, integrating a traveling wave distance measurement module and a line protection module in a line protection and traveling wave distance measurement integrated device, simultaneously and respectively carrying out power frequency quantity sampling and high-frequency transient sampling on the line protection module and the traveling wave distance measurement module, and judging whether an in-zone fault occurs by the line protection module;
step 2, the line protection module calculates the channel delay t in real timedAnd calculating the deviation delta t of the absolute clocks at both sidesc；
Step 3, after the line protection module judges that the fault occurs in the area, the traveling wave ranging module obtains a modulus maximum value through wavelet transformation on the transient traveling wave sampled before and after the fault, and determines the absolute clock time when the initial fault traveling wave reaches the side;
step 4, the traveling wave ranging modules at two sides exchange the absolute clock time of the arrival of the initial fault traveling wave through the line protection channel, and simultaneously read the channel delay tdDeviation Δ t from both sides absolute clockcThereby obtaining the failure initialThe initial traveling wave reaches the absolute clock difference value delta t of the two sides, and whether the absolute clock difference value delta t is available is checked;
step 5, the traveling wave ranging modules on the two sides use a double-end traveling wave algorithm to perform traveling wave ranging according to the available absolute clock difference value delta t;
in the step 1, the line protection module and the traveling wave ranging module realize simultaneous sampling based on the same internal clock;
in the step 2, the line protection module calculates the channel delay t in real timedThe method is realized by adopting a channel delay measurement technology based on a ping-pong principle; setting the two side protection devices as a host and a slave respectively, wherein the host is at tm1Sending the current time mark of the host and the calculated channel delay t to the slave at any momentdA command of (2); delay t after slave receives commandmTime-to-slave current time scale and delay time tmReturning to the host; the time when the host receives the return information is tr2Calculating the channel delay as follows:
calculating the deviation delta t of the absolute clocks at two sides in the step 2cThe method is realized by adopting a clock adjustment method based on a data channel; setting the absolute clock of the host as the clock of two sides, the host being at the current time tmjWill include the channel delay tdOne frame of information including an absolute clock deviation calculation command is sent to the slave, and the slave receives the information at the time tr3Host sending time tmjAnd tdCalculating the absolute clock deviation delta t of the master and the slavec：
Δtc＝tmj-(tr3-td)；
The method for obtaining the absolute clock difference value delta t of the fault initial traveling wave reaching two sides by the double-end traveling wave ranging module in the step 4 is as follows: setting the absolute clock moments corresponding to the maximum values of the wave modes of the initial fault lines calculated by the two integrated devices at two sides as tmcAnd tncRespectively sends the moment to the opposite side, and the two sides are integratedThe device receives the corresponding frame and delays t according to the channeldDeviation Δ t from both sides absolute clockcBack to the corresponding absolute clock time tmcnAnd tncmLet M side be the master and N side be the slave, for M side, tmcnIs the absolute time t of the M sidemcConverted to absolute time to N side, tmcn＝tmc-Δtc；tncmIs the absolute time t of the N sidencConverted to absolute time t on the M sidencm＝tnc+ΔtcWhen both sides are compared with each other by comparison tmcAnd tncmAnd tncAnd tmcnThe error of the two-side fault initial traveling wave is obtained, namely the absolute clock difference value delta t of the two-side fault initial traveling wave reaching the two sides is obtained, and the absolute clock difference value delta t of the M-side fault is calculated to be delta tmn＝tmc-tncmFor a fault absolute clock difference Δ t on the N side, it is calculated as Δ tnm＝tnc-tmcn；
The method for checking whether the absolute clock difference Δ t is available in step 4 is as follows: the absolute value of the difference between the respective absolute clocks at both sides should not be greater than the line length divided by the speed of the travelling wave, i.e. the absolute value
Wherein L is the line length and v is the traveling wave velocity.
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| 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 |
| 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 | An improved double-ended traveling wave fault location method |
| CN112763837B (en) * | 2019-11-01 | 2023-04-14 | 国电南瑞科技股份有限公司 | A dual-terminal traveling wave ranging method with clock adaptive compensation |
| 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 |
| CN111896838B (en) * | 2020-07-10 | 2021-09-07 | 国网安徽省电力有限公司亳州供电公司 | Double-ended traveling wave fault location method based on information feature identification |
| CN114152837B (en) * | 2020-09-08 | 2023-02-10 | 南京南瑞继保电气有限公司 | Wave head identification method and device under multi-scale wavelet transform |
| WO2025097321A1 (en) * | 2023-11-08 | 2025-05-15 | 清华大学 | Satellite-timing-independent double-ended traveling wave fault locating method and apparatus for power transmission line |
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