CN112763837B - Double-end traveling wave distance measurement method for clock self-adaptive compensation - Google Patents
Double-end traveling wave distance measurement method for clock self-adaptive compensation Download PDFInfo
- Publication number
- CN112763837B CN112763837B CN201911059386.2A CN201911059386A CN112763837B CN 112763837 B CN112763837 B CN 112763837B CN 201911059386 A CN201911059386 A CN 201911059386A CN 112763837 B CN112763837 B CN 112763837B
- Authority
- CN
- China
- Prior art keywords
- time
- integrated device
- traveling wave
- gps
- sampling time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a double-end traveling wave distance measurement method for clock self-adaptive compensation, which is realized by adopting integrated devices, wherein the integrated devices are respectively arranged at two sides of a pilot fiber channel, and the data interacted between the integrated devices at the two sides comprises the following steps: absolute time of an external clock, synchronous state of the external clock, time difference between the absolute time and sampling time, and time difference between arrival time of the initial traveling wave and the sampling time; the method comprises the following steps: calculating the time delay of the longitudinal optical fiber channels of the integrated devices on two sides respectively to complete the synchronization of the differential protection ping-pong time delay of the longitudinal optical fiber channels; when the ping-pong time ticks of the longitudinal optical fiber channel differential protection are in a synchronous state and the external clocks of the integrated devices on the two sides are also in the synchronous state, acquiring the sampling time deviation of the ping-pong time ticks of the integrated devices on the two sides during normal operation; based on the sampling time deviation of ping-pong time synchronization in normal operation, when the external synchronous clock is abnormal, the integrated device automatically compensates the sampling time deviation and calculates the traveling wave double-end ranging.
Description
Technical Field
The invention belongs to the field of relay protection of power systems, and particularly relates to a double-end clock self-adaptive compensation traveling wave distance measurement method of an integrated traveling wave distance measurement device, in particular to a double-end traveling wave distance measurement method of clock self-adaptive compensation.
Background
The accurate distance measurement of the transmission line fault has very important significance for an operation department to quickly find a fault point, shorten the line power failure time and improve the system power supply reliability. Compared with impedance ranging, the traveling wave ranging has the characteristic of being not influenced by factors such as a system operation mode, system oscillation, line distribution capacitance, current transformer saturation, transition resistance and the like. The existing traveling wave distance measurement method mainly comprises a single-end distance measurement method and a double-end distance measurement method. The single-ended traveling wave distance measurement method does not depend on an external clock, and has the defects that dead zones exist in single-ended traveling wave distance measurement, attenuation exists in traveling wave reflection, and single-ended distance measurement cannot be carried out under the conditions of a plurality of line structures and faults, so that the single-ended traveling wave distance measurement precision is poor or the condition of failure possibly exists. The double-end traveling wave distance measurement can calculate the distance from a fault point to two ends of a line only by using the absolute time when the initial traveling wave of current or voltage generated by the line fault reaches the two ends of the line, and the accuracy and the reliability of the double-end traveling wave distance measurement are greatly improved compared with the accuracy and the reliability of the single-end traveling wave distance measurement.
The existing traveling wave distance measuring device is configured according to stations, and data processing between the stations of different manufacturers cannot be compatible, so that the double-end traveling wave distance measuring method cannot be well applied to the traveling wave distance measuring device. The integrated device (hereinafter referred to as integrated device) with the traveling wave ranging function provided by the invention can interact traveling wave data information at two sides by utilizing a pilot optical fiber channel protected by a line, thereby realizing the double-end ranging function.
Because double-end ranging captures the absolute time when the fault traveling wave in the line reaches the two ends of the line, the main factor influencing the double-end ranging function is the accuracy of the clock. Under the condition that any one of the two sides of the protection device is abnormal or lost, the double-end traveling wave distance measurement error is large or even fails, the fault position of the power transmission line cannot be quickly and accurately positioned, and the power supply recovery time is prolonged.
Chinese patent publication No. CN 108562829A discloses a two-side clock synchronization monitoring method for a line protection and two-end traveling wave ranging integrated device, which can realize sampling time synchronization of two-end traveling wave ranging, and monitor deviation of two-side clocks in real time, thereby ensuring consistency of the two-side clocks.
Chinese patent publication No. CN 10969603A discloses a method for real-time monitoring of two-side external clocks in double-end traveling wave ranging, in which a double-end traveling wave ranging function and a line protection function are integrated inside a line protection and traveling wave ranging integrated device, and the line protection function calculates channel delay in real time and completes synchronization of the two-side internal clocks; the double-end traveling wave ranging function shares the internal clock and the channel delay information of the line protection function, realizes the synchronization of the external clocks at two sides of the double-end traveling wave ranging, and improves the reliability of the double-end traveling wave ranging.
The double-end traveling wave distance measurement method used by the existing traveling wave distance measurement device and the integrated device integrating the traveling wave function both depends on the clock precision of the devices at both sides, and the time setting precision and the working state of the device clock directly influence the performance and the precision of double-end distance measurement. The sampling time synchronization of two sides is realized by simply utilizing differential ping-pong time synchronization, the sampling time synchronization of two sides cannot achieve 1 us-level synchronization, the sampling time of two sides has synchronization error and is easily influenced by the difference of devices on two sides and communication messages, so the double-end ranging function cannot be realized by utilizing a synchronous clock with differential protection. In the prior art, under the condition that the synchronous clocks on the two sides are abnormal or lost, the error of the double-end ranging method based on the absolute time on the two sides is large or even fails, and the prior art does not have a corresponding solution.
Disclosure of Invention
The invention aims to provide a double-end traveling wave distance measurement method with clock self-adaptive compensation aiming at the problems in the prior art. The method combines the longitudinal differential protection ping-pong time synchronization principle to automatically compensate the absolute time difference of sampling moments of devices on two sides of a line, and when the synchronous clocks on one side or two sides of the line protection of the integrated traveling wave ranging are abnormal or lost, the double-end traveling wave ranging function can still work correctly without depending on the synchronous clocks on the two sides.
In order to realize the purpose, the invention adopts the technical scheme that:
a double-end traveling wave distance measurement method of clock self-adaptive compensation is realized by adopting an integrated device integrating traveling wave distance measurement functions in a line protection device, the integrated device is respectively arranged at two sides of a pilot optical fiber channel, and data interaction between the integrated devices at the two sides comprises the following steps: absolute time of an external clock, synchronous state of the external clock, time difference between the absolute time and sampling time, and time difference between arrival time of the initial traveling wave and the sampling time; the method comprises the following steps:
calculating the time delay of the longitudinal optical fiber channels of the integrated devices on two sides respectively to complete the synchronization of the differential protection ping-pong time delay of the longitudinal optical fiber channels;
when the ping-pong time ticks of the longitudinal optical fiber channel differential protection are in a synchronous state and the external clocks of the integrated devices on the two sides are also in the synchronous state, acquiring the sampling time error of the ping-pong time ticks of the integrated devices on the two sides during normal operation;
based on the sampling time error of ping-pong time synchronization during normal operation, when the external synchronous clock is abnormal, the integrated device automatically compensates the sampling time error and calculates the traveling wave double-end ranging.
Specifically, the external synchronous clock is in an abnormal state, which means that one or both of the two side integrated devices are lost.
Preferably, the integrated devices on the two sides are divided into a master and a slave, and after the master and the slave respectively calculate the pilot fiber channel delay, the slave adjusts the sampling time until the sampling time is synchronous with the master, so as to complete the sampling time synchronization of the differential protection on the two sides.
Preferably, the master and the slave respectively calculate time differences between respective pulse per second and sampling time, and perform real-time interaction on the time differences, and the master and the slave respectively determine the external clock synchronization states at both sides according to the time differences.
Preferably, after the host and the slave respectively determine the external clock synchronization states of the two sides, when the external clock synchronization states of the integrated devices on the two sides are in a normal synchronization state, the integrated devices on the two sides are calculated and protected at the same longitudinal differential sampling time t Mi ,t Ni The synchronous clock trigger time t of the corresponding integrated board card Mi_pps ,t Ni_pps Wherein M represents the M side of the two sides, N represents the N side of the two sides, and the sampling error delta t of the ping-pong time synchronization of longitudinal differential protection is further calculated MN_sp I.e. Δ t MN_sp ＝t Mi_gps -t Ni_gps ，Δt MN_sp And the sampling error is updated in real time when each sampling interruption occurs when the two side integrated devices are in a synchronous state.
Preferably, if the clocks of the integrated devices on the two sides of the M side and the N side are in a synchronous state, the double-end ranging calculation formula of the integrated devices on the two sides after the line fault is as follows:
in the formula: l is a radical of an alcohol M Distance from fault point to M-side integrated device, L N The distance from the fault point to the N-side integrated device;
L set setting a line length value, and upsilon is a linear mode wave velocity;
t M_gps absolute time, t, at which the initial travelling wave generated for the fault reaches the M-side integrated device N_gps The absolute moment at which the initial traveling wave generated for the fault reaches the N-side integrated device.
Preferably, if the clock of the M-side integrated device is in a synchronous clock state and the clock of the N-side integrated device is in an asynchronous state, the double-end ranging calculation formula of the two-side integrated devices is as follows:
in the formula: t is t M_sp The traveling wave reaches the sampling time corresponding to the M-side integrated device;
Preferably, if the clock of the M-side integrated device is in an asynchronous state and the clock of the N-side integrated device is in a synchronous clock state, the double-end ranging calculation formula of the two-side integrated devices is as follows:
in the formula: t is t M_sp The traveling wave reaches the sampling moment corresponding to the M-side integrated device;
Δt N(gps_sp) and the relative time difference between the traveling wave arrival time and the sampling time when the traveling wave reaches the N-side integrated device.
Preferably, if the clocks of the two integrated devices on the M side and the N side are in an asynchronous state, the two-end ranging calculation formula of the two integrated devices on the two sides is as follows:
compared with the prior art, the invention has the beneficial effects that: the invention integrates the traveling wave ranging function in the line protection device, automatically compensates the absolute time difference of the sampling time of the integrated devices at two sides of the line in real time by combining the external clock synchronization of the traveling wave integrated device and the synchronization method of the pilot differential protection sampling time adjustment, and can still correctly work without depending on the synchronous clocks at two sides when the synchronous clocks at one side or two sides of the line are abnormal or disappear, and the ranging precision is not influenced.
Drawings
FIG. 1 is a schematic flow chart of a double-ended traveling wave ranging method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of calculating a pilot fiber channel delay according to an embodiment of the invention;
FIG. 3 is a state diagram of protection clock and delay timing for both sides according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
If 1, a double-end traveling wave ranging method for clock adaptive compensation comprises the following steps:
step 1: the line protection device integrated with traveling wave ranging is characterized in that the absolute time of external clocks at two sides, the synchronous state of the external clocks, and the time of second pulse (PPS) and sampling time (t _ sp) of GPS clock of the line protection device are added in the interactive data of optical fiber channels at two sides of differential protection of a pilot lineTime difference delta t between arrival time of traveling wave head of traveling wave ranging board card of interval difference traveling wave ranging device and sampling time gps_sp ；
And 2, step: the host and the slave respectively calculate the pilot fiber channel delay Td; as shown in fig. 2, the method for calculating the channel delay by the slave machine includes: (1) The slave sends a message to the master at the time of tn _ s, (2) the master receives the message of the slave at the time of tm _ r, the message is sent to the slave at the time of tm _ s, and the slave receives the message returned by the master at the time of tn _ r. The formula for calculating the channel delay is as follows:
and step 3: the slave computer adjusts the sampling time until the sampling time is synchronous with the master computer;
and the slave calculates sampling time errors at two sides according to the channel delay Td and the sampling time tn of the slave corresponding to the time tm of the master, adjusts the sampling interruption time according to the sampling time errors, and sets the sampling time synchronization state of differential protection at two sides when the sampling time errors of the master and the slave are close to 0.
And 4, step 4: when the external synchronous clock state of the two-side integrated device is normal (GPS _ M =1, GPS _n = 1), and the differential protection sampling time calculated in step 3 is also in a synchronous state (SYN _ DIF _ M =1, SYN _dif _n = 1). Respectively calculating the time difference between the Pulse Per Second (PPS) and the sampling time (t _ sp) of the host and the slave of the integrated device on the two sides, and carrying out real-time interaction on the data by the host and the slave;
and 5: the host machine and the slave machine respectively judge the synchronous clock states of the two sides, and when the synchronous clock states of the integrated devices at the two sides are in a normal synchronous state, the integrated devices at the two sides are calculated and protected at the same longitudinal differential sampling time t Mi_sp ,t Ni_sp The corresponding synchronous clock trigger time t of the integrated board card Mi_pps And t Ni_pps In the case where the external synchronous clocks on both sides are in synchronization t Mi_pps ＝t Ni_pps And calculating to obtain the sampling time error delta t of the longitudinal differential protection at two sides MN_sp I.e. at MN_sp ＝t Mi_pps -t Ni_pps ，Δt MN_sp Sampling time errorThe difference is updated in real time for each sampling interrupt when the two side integrated devices are in a synchronous state.
Step 6: if the clocks of the integrated devices on the M side and the N side are in a synchronous state, the absolute time t of the initial traveling wave generated in the line fault to reach the integrated devices on the M side and the N side respectively is directly utilized M_gps And t N_gps The double-end distance measurement calculation formula of the two-side integrated device is as follows:
and 7: if the M-side integrated device clock is in a synchronous state (GPS _ M = 1) and the N-side integrated device clock is in an asynchronous state (GPS _ N = 0), the time from the initial traveling wave generated by the line fault to the M-side integrated device still uses the absolute time t M_gps . As shown in fig. 3: n-side sampling time t N_sp Corresponding to sampling time t of M side M_sp Precise time t of sampling time on N side N_sp The error delta t of the sampling time when the clock state is synchronized between the sampling time of the M side and the N side MN_sp Obtaining t N_sp ＝t M_sp -Δt MN_sp (ii) a Then according to the time t of the traveling wave reaching the traveling wave board card of the N-side integrated device N_gps Sampling time t with N-side device N_sp Relative time difference Δ t of N(gps_sp) And calculating to obtain the precise time t of the traveling wave time when the traveling wave reaches the N-side device N_gps ＝t M_sp -Δt MN_sp +Δt N(gps_sp) (ii) a The double-end distance measurement calculation formula of the two-side integrated device is as follows:
in the formula: t is t M_sp The traveling wave reaches the sampling time corresponding to the M-side integrated device;
Δt N(gps_sp) and the relative time difference between the traveling wave arrival time and the sampling time when the traveling wave reaches the N-side integrated device.
And step 8: if the M-side integrated device clock is in asynchronous state (GPS _ M)= 0), the N-side integrated device clock is in a synchronous state (GPS _ N = 1), and the time from the initial traveling wave generated by the line fault to the N-side integrated device still uses the absolute time t N_gps . As shown in fig. 3: m-side sampling time t M_sp Corresponding to sampling time t of N side N_sp Precise time t of sampling time on N side N_sp The error delta t of the sampling time of the sampling value of the M side and the sampling time of the N side synchronous clock state can be obtained MN_sp Find t M_sp ＝t N_sp +Δt MN_sp (ii) a Then according to the time t of the traveling wave reaching the traveling wave board card of the M-side integrated device M_gps Sampling time t with M side device M_sp Relative time difference Δ t of M(gps_sp) And calculating to obtain the precise time t of the traveling wave time when the traveling wave reaches the M-side device M_gps ＝t M_sp +Δt MN_sp +Δt M(gps_sp) (ii) a The double-end distance measurement calculation formula of the two-side integrated device is as follows:
in the formula: t is t M_sp The traveling wave reaches the sampling moment corresponding to the M-side integrated device;
Δt N(gps_sp) the relative time difference between the traveling wave arrival time and the sampling time when the traveling wave reaches the N-side integrated device is obtained.
And step 9: if the M-side ic clock is in an asynchronous state (GPS _ M = 0), the N-side ic clock is also in an asynchronous state (GPS _ N = 0). As shown in fig. 3, the traveling wave arrives at the sampling time t of the M-side integrated device M_sp Corresponding to sampling time t of N side N_sp Time t of traveling wave board card of M-side integrated device M_gps Sampling time t with M side device M_sp Relative time difference Δ t of M(gps_sp) ，t M_gps ＝t M_sp +Δt M(gps_sp) (ii) a The sampling time t of the traveling wave reaching the N side integrated device N_sp Corresponding to sampling time t of M side M_sp Time t of N-side integrated device traveling wave board card N_gps Sampling time t with N-side device N_sp Relative time difference Δ t of N(gps_sp) ，t N_gps ＝t N_sp +Δt N(gps_sp) (ii) a The double-end distance measurement calculation formula of the two-side integrated device is as follows:
although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. A double-end traveling wave distance measurement method of clock self-adaptive compensation is characterized in that the method is realized by adopting an integrated device integrating traveling wave distance measurement functions in a line protection device, the integrated device is respectively arranged at two sides of a pilot optical fiber channel, and interactive data between the integrated devices at the two sides comprises the following steps: absolute time of an external clock, synchronous state of the external clock, time difference between the absolute time and sampling time, and time difference between arrival time of the initial traveling wave and the sampling time; the method comprises the following steps:
calculating the time delay of the longitudinal optical fiber channels of the integrated devices on the two sides respectively to complete the ping-pong time synchronization of differential protection of the longitudinal optical fiber channels; the integrated devices on the two sides are divided into a host and a slave, after the host and the slave respectively calculate the delay of the pilot fiber channel, the slave adjusts the sampling time until the sampling time is synchronous with the host, and the synchronization of the sampling time of the differential protection on the two sides is completed; the master machine and the slave machine respectively calculate the time difference between the pulse per second and the sampling time, and carry out real-time interaction on the time difference, and the master machine and the slave machine respectively judge the synchronous states of the external clocks at the two sides according to the time difference;
when the ping-pong time ticks of the longitudinal optical fiber channel differential protection are in a synchronous state and the external clocks of the integrated devices on the two sides are also in the synchronous state, acquiring the sampling time error of the ping-pong time ticks of the integrated devices on the two sides during normal operation; wherein, after the host and the slave respectively judge the synchronous state of the external clocks at two sides, the master and the slave gather at two sidesWhen the external clock synchronization state of the integrated device is in a normal synchronization state, the integrated devices on two sides are calculated and protected at the same longitudinal difference sampling time t Mi ,t Ni The synchronous clock trigger time t of the corresponding integrated board card Mi_pps ,t Ni_pps And calculating to obtain the sampling time error delta t of the ping-pong time setting of the longitudinal differential protection at the two sides MN_sp Error at sampling time Δ t MN_sp Each sampling interruption is updated in real time when the integration devices on the two sides are in a synchronous state;
based on the sampling time error of ping-pong time synchronization in normal operation, when the external synchronous clock is abnormal, the integrated device automatically compensates the sampling time error and calculates the traveling wave double-end ranging;
if the clock of the M-side integrated device is in a synchronous state and the clock of the N-side integrated device is in an asynchronous state, the time from the initial traveling wave generated by the line fault to the M-side integrated device still uses the absolute time t M_gps Then the N side samples the time t N_sp Corresponding to sampling time t of M side M_sp Precise time t of sampling instant on the N side N_sp By the error Δ t between the sampling time of the M side and the sampling time of the N side in the synchronous clock state MN_sp Find t N_sp ＝t M_sp -Δt MN_sp (ii) a Then according to the time t of the traveling wave reaching the traveling wave board card of the N-side integrated device N_gps Sampling time t with N-side device N_sp Relative time difference Δ t of N(gps_sp) And calculating to obtain the precise time t of the traveling wave reaching the N-side device N_gps ＝t M_sp -Δt MN_sp +Δt N(gps_sp) (ii) a The double-end distance measurement calculation formula of the two-side integrated device is as follows:
in the formula:
L M the distance from the fault point to the M-side integrated device;
L N the distance from the fault point to the N-side integrated device;
L set setting a line length;
upsilon is a linear mode wave velocity;
if the clock of the M-side integrated device is in an asynchronous state and the clock of the N-side integrated device is in a synchronous state, the time from the initial travelling wave generated by the line fault to the N-side integrated device still uses the absolute time t N_gps Then the M side sampling time t M_sp Corresponding to sampling time t of N side N_sp Precise time t of sampling time on N side N_sp By the sampling value of M side and the sampling time error delta t of N side synchronous clock state MN_sp Find t M_sp ＝t N_sp +Δt MN_sp (ii) a Then according to the time t of the traveling wave reaching the traveling wave board card of the M-side integrated device M_gps Sampling time t with M side device M_sp Relative time difference Δ t of M(gps_sp) And calculating to obtain the precise time t of the traveling wave reaching the M-side device M_gps ＝t M_sp +Δt MN_sp +Δt M(gps_sp) (ii) a The double-end distance measurement calculation formula of the two-side integrated device is as follows:
in the formula: l is a radical of an alcohol M The distance from the fault point to the M-side integrated device;
L N the distance from the fault point to the N-side integrated device;
L set setting a line length;
upsilon is a linear mode wave velocity;
if the clock of the M-side integrated device is in an asynchronous state and the clock of the N-side integrated device is also in an asynchronous state, the traveling wave reaches the sampling time t of the M-side integrated device M_sp Corresponding to sampling time t of N side N_sp Time t of traveling wave board card of M-side integrated device M_gps Sampling time t of M side device M_sp Relative time difference Δ t of M(gps_sp) ，t M_gps ＝t M_sp +Δt M(gps_sp) (ii) a Traveling wave arriving at N side integrated device, sampling time t N_sp Corresponding to sampling time t of side M M_sp Time t of N-side integrated device traveling wave board card N_gps Sampling with N-side devicesAt time t N_sp Relative time difference Δ t of N(gps_sp) ，t N_gps ＝t N_sp +Δt N(gps_sp) (ii) a The double-end distance measurement calculation formula of the two-side integrated device is as follows:
in the formula: l is a radical of an alcohol M The distance from the fault point to the M-side integrated device;
L N the distance from the fault point to the N-side integrated device;
L set setting a line length value;
upsilon is the linear mode wave velocity.
2. The clock self-adaptive compensation double-end traveling wave ranging method according to claim 1, wherein if the clocks of the integrated devices on the M side and the N side are in a synchronous state, the double-end ranging calculation formula of the integrated devices on the two sides after the line fault is as follows:
in the formula: l is a radical of an alcohol M Distance of fault point to M side integrated device, L N The distance from the point of failure to the N-side integrated device,
L set is a line length setting value, upsilon is a linear mode wave velocity,
t M_gps absolute moment, t, at which the initial travelling wave generated for a fault reaches the M-side integrated device N_gps The absolute moment at which the initial traveling wave generated for the fault reaches the N-side integrated device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911059386.2A CN112763837B (en) | 2019-11-01 | 2019-11-01 | Double-end traveling wave distance measurement method for clock self-adaptive compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911059386.2A CN112763837B (en) | 2019-11-01 | 2019-11-01 | Double-end traveling wave distance measurement method for clock self-adaptive compensation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112763837A CN112763837A (en) | 2021-05-07 |
| CN112763837B true CN112763837B (en) | 2023-04-14 |
Family
ID=75692077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911059386.2A Active CN112763837B (en) | 2019-11-01 | 2019-11-01 | Double-end traveling wave distance measurement method for clock self-adaptive compensation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112763837B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114221732A (en) * | 2021-12-23 | 2022-03-22 | 北京四方继保工程技术有限公司 | High-precision ping-pong synchronization method and system with synchronization quality |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016082458A (en) * | 2014-10-20 | 2016-05-16 | 株式会社明電舎 | Sampling synchronization monitoring device for protective relay system, and sampling synchronization monitoring method |
| CN106199330A (en) * | 2016-06-24 | 2016-12-07 | 国电南瑞南京控制***有限公司 | A kind of marine wind electric field collection line fault alignment system and method |
| CN108535596A (en) * | 2018-04-10 | 2018-09-14 | 南京南瑞继保电气有限公司 | A kind of travelling wave ranging method not depending on clock synchronization |
| CN108562829A (en) * | 2018-03-28 | 2018-09-21 | 南京南瑞继保电气有限公司 | Route protection monitoring method synchronous with the both sides clock of both-end travelling wave ranging integrated apparatus |
| CN108802563A (en) * | 2018-04-10 | 2018-11-13 | 南京南瑞继保电气有限公司 | A kind of both-end travelling wave ranging method not depending on clock synchronization |
| CN109031033A (en) * | 2017-06-09 | 2018-12-18 | 许继集团有限公司 | A kind of fault branch recognition methods and system based on T node current |
| CN109103857A (en) * | 2018-10-16 | 2018-12-28 | 南京南瑞继保电气有限公司 | A kind of route protection indulges connection road synchronous regime monitoring method and device |
| WO2019097311A1 (en) * | 2017-11-17 | 2019-05-23 | Abb Schweiz Ag | Traveling wave based fault location using unsynchronized measurements for transmission lines |
| CN109980611A (en) * | 2018-11-28 | 2019-07-05 | 南京国电南自电网自动化有限公司 | Meet the longitudinal differential protection adaptive synchronicity method and apparatus of IEEE C37.94 standard |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012061978A1 (en) * | 2010-11-09 | 2012-05-18 | Abb Research Ltd. | Synchronization method for current differential protection |
-
2019
- 2019-11-01 CN CN201911059386.2A patent/CN112763837B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016082458A (en) * | 2014-10-20 | 2016-05-16 | 株式会社明電舎 | Sampling synchronization monitoring device for protective relay system, and sampling synchronization monitoring method |
| CN106199330A (en) * | 2016-06-24 | 2016-12-07 | 国电南瑞南京控制***有限公司 | A kind of marine wind electric field collection line fault alignment system and method |
| CN109031033A (en) * | 2017-06-09 | 2018-12-18 | 许继集团有限公司 | A kind of fault branch recognition methods and system based on T node current |
| WO2019097311A1 (en) * | 2017-11-17 | 2019-05-23 | Abb Schweiz Ag | Traveling wave based fault location using unsynchronized measurements for transmission lines |
| CN108562829A (en) * | 2018-03-28 | 2018-09-21 | 南京南瑞继保电气有限公司 | Route protection monitoring method synchronous with the both sides clock of both-end travelling wave ranging integrated apparatus |
| CN108535596A (en) * | 2018-04-10 | 2018-09-14 | 南京南瑞继保电气有限公司 | A kind of travelling wave ranging method not depending on clock synchronization |
| CN108802563A (en) * | 2018-04-10 | 2018-11-13 | 南京南瑞继保电气有限公司 | A kind of both-end travelling wave ranging method not depending on clock synchronization |
| CN109103857A (en) * | 2018-10-16 | 2018-12-28 | 南京南瑞继保电气有限公司 | A kind of route protection indulges connection road synchronous regime monitoring method and device |
| CN109980611A (en) * | 2018-11-28 | 2019-07-05 | 南京国电南自电网自动化有限公司 | Meet the longitudinal differential protection adaptive synchronicity method and apparatus of IEEE C37.94 standard |
Non-Patent Citations (5)
| Title |
|---|
| Real-Time Traveling-Wave-Based Fault Location Using Two-Terminal Unsynchronized Data;F. V. Lopes 等;《IEEE TRANSACTIONS ON POWER DELIVERY》;20150630;第30卷(第3期);第1067-1076页 * |
| Two-terminal AF location scheme for multi-segment combined transmission lines using unsynchronized measurements;Mahdi Ghazizadeh-Ahsaee;《Electrical Power and Energy Systems》;20180711;第101-109页 * |
| 一种基于同步闭环监测的新型变电站自动化设备对时校验方法;习新魁 等;《2017年"电子技术应用"智能电网会议论文集》;20171231;全文 * |
| 不依赖双侧时钟同步的双端行波协同测距;方毅 等;《云南电力技术》;20160630;第44卷(第3期);第33-37页 * |
| 不依赖双侧时钟同步的输电线双端行波测距;张广斌 等;《电工技术学报》;20151031;第30卷(第20期);第199-209页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112763837A (en) | 2021-05-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7602873B2 (en) | Correcting time synchronization inaccuracy caused by asymmetric delay on a communication link | |
| EP2801162B1 (en) | Method and apparatus for communicating time information between time-aware devices | |
| CN103368137B (en) | Multi-terminal self-repairing data synchronization differential protection method based on network self-repairing | |
| CN110492965A (en) | The method and apparatus of serial message clock synchronization in a kind of master-slave system | |
| CN105847050B (en) | A kind of the disconnection fault detection and the synchronous restoration methods of clock of Industrial Ethernet | |
| CN101877676B (en) | Method for judging change of differential protection route according to change of unidirectional transmission delay | |
| CN102449940A (en) | Network synchronization method and apparatus for performing time synchronization between nodes | |
| CN108802563B (en) | Double-end traveling wave distance measurement method independent of time setting | |
| WO2022262019A1 (en) | 5g communication-based alternating current/direct current electric power transmission line traveling wave fault distance-measuring method and system | |
| CN112763837B (en) | Double-end traveling wave distance measurement method for clock self-adaptive compensation | |
| CN108535596A (en) | A kind of travelling wave ranging method not depending on clock synchronization | |
| CN103595588A (en) | Method for accurately measuring asynchronous Ethernet circuit time delay | |
| CN111308275A (en) | Method for improving fault location precision of traveling wave method | |
| CN103399264B (en) | High-tension cable partial discharge monitoring and positioning system | |
| CN111478295B (en) | Data synchronization method and system suitable for wireless line differential protection | |
| CN108666990A (en) | A kind of power grid differential protecting method and system | |
| CN111601189B (en) | Accurate time synchronization method and system applied to cable distance measuring device | |
| CN109696603B (en) | Real-time monitoring method for two-side external clocks of two-end traveling wave ranging | |
| CN112422572A (en) | Man-in-the-middle attack system and method for optical fiber time synchronization system | |
| CN107483291B (en) | Optical fiber longitudinal differential time synchronization method | |
| JPH10142361A (en) | Time synchronization system of transmission network | |
| CN105319958B (en) | A kind of ultra-distance communication cable high-accuracy network time dissemination system and its method | |
| JPH01231618A (en) | Synchronizing of sampling time | |
| CN103078698A (en) | Channel delay compensation method | |
| CN106034003B (en) | Method based on double-fiber transmitting ultraprecise frequency time signal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |