CN107959969B - Time synchronization method applied to transient recording type fault indicator - Google Patents

Time synchronization method applied to transient recording type fault indicator Download PDF

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CN107959969B
CN107959969B CN201711311867.9A CN201711311867A CN107959969B CN 107959969 B CN107959969 B CN 107959969B CN 201711311867 A CN201711311867 A CN 201711311867A CN 107959969 B CN107959969 B CN 107959969B
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CN107959969A (en
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张文魁
周任飞
张林桥
张恒舫
刘三丰
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Wuhan Zhongyuan Electronic Information Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
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    • H04W56/001—Synchronization between nodes
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Abstract

The invention discloses a time synchronization method applied to a transient recording type fault indicator.A convergence unit broadcasts a synchronization beacon frame to each phase acquisition unit for synchronization; each phase acquisition unit sends data frames containing synchronous bytes to other phase acquisition units and a convergence unit, and each phase acquisition unit monitors the data frames of other phase acquisition units and beats the synchronous bytes; the two-phase acquisition unit which sends the data frame first synchronizes the local time with the acquisition unit which sends the data frame last according to the relative time drift and the relative initial time offset. And the convergence unit synchronizes the data frames of all phases according to the obtained time deviation. The invention realizes the local synchronization among the acquisition units and the post-synchronization of each phase of data frames in the convergence unit.

Description

Time synchronization method applied to transient recording type fault indicator
Technical Field
The invention belongs to the technical field of power distribution network state monitoring and fault positioning of a power system, and particularly relates to a time synchronization method applied to a transient recording type fault indicator.
Background
In a power distribution network system, the number of line branches is large, the operation condition is complex, when short circuit and ground fault occur, the fault section is difficult to determine, and the maintenance work is difficult, especially in remote areas, the time and labor are wasted when the fault section is searched. With the advance of distribution automation and rural power grid transformation in China, a fault indicator is already put into use in large quantities as one of distribution fault positioning technical means. Because the traditional two-remote fault indicator has low accuracy for judging the single-phase earth fault, the national power grid starts to push a transient recording type fault indicator, and the single-phase earth fault is judged by the zero-sequence transient current characteristic synthesized by three phases, so that the acquisition units installed on a three-phase line are required to maintain high-precision time synchronization, and the national standard specifies: and the error of three-phase time synchronization of each group of acquisition units is not more than 100 mu s.
The acquisition units of the transient recording type fault indicator are installed on an overhead line, the acquisition units installed on a three-phase line A, B, C at the same position form a group, the acquisition units are communicated with the convergence unit to synthesize zero-sequence current, the acquisition units adopt crystal oscillators to maintain local clocks, and due to random offset and drift of the phases of the crystal oscillators, local time of each acquisition unit can deviate. If time correction is not carried out, synchronization between each group of acquisition units is lost, and the synthesized zero-sequence current is inaccurate. Meanwhile, in the economic aspect, the acquisition unit generally adopts a common clock crystal oscillator, the crystal oscillator precision is not high, and here, the crystal oscillator precision is assumed to be 20ppm, and the time synchronization period must be less than 5s to maintain the synchronization error of 100 mus. However, the acquisition unit generally adopts energy acquisition CT and battery power supply, which has a very high requirement on power consumption, and the national standard specifies: "the minimum working current of the collecting unit is not more than 80 muA when the battery is used for supplying power alone. Under the condition that the battery is not replaced, the continuous working time is not less than 8 years, the condition that the flashing alarm is more than 2000 hours is met, and the acquisition unit can not meet the power consumption requirement under the time synchronization period of 5s, so that the time synchronization algorithm of the transient recording type fault indicator not only requires higher synchronization precision, but also requires energy efficiency.
The transient recording type fault indicator consists of a convergence unit and an indication unit, wherein the convergence unit, a collection unit and the collection unit are communicated through wireless signals to form a small wireless sensor network, and the design of a synchronization mechanism of the transient recording type fault indicator needs to follow the characteristics of a wireless sensor network time synchronization mechanism: stability, convergence, energy perception and the like, but because the sensor network has strong application correlation, the existing time synchronization mechanism is not suitable for a fault indicator scene, and the time synchronization mechanism meeting the high synchronization precision and ultra-low power consumption scene of the fault indicator needs to be designed. According to state network statistics, the time synchronization precision in the special detection of the transient recording type fault indicator of each existing manufacturer cannot reach the synchronization error of 100 mu s, so that the accuracy of the synthesized transient zero-sequence current is inevitably influenced, the single-phase earth fault is not accurately judged, and the application effect of the transient recording type fault indicator is influenced. Therefore, research and development of an energy efficient time synchronization mechanism suitable for the transient recording type fault indicator have important practical significance for ensuring accurate judgment and reliable positioning of the transient recording type fault indicator on the single-phase earth fault.
Disclosure of Invention
The present invention is directed to solve the above problems of the prior art, and provides a time synchronization method applied to a transient recording type fault indicator. According to the technical scheme, time scales are carried by data frames to reduce time synchronization energy consumption, synchronization errors are reduced by a clock offset and clock drift estimation compensation method, a convergence unit achieves post-synchronization between acquisition units based on time differences between the received time scales and the time scales transmitted by the acquisition units, the convergence unit adaptively adjusts the transmission period of a time synchronization beacon frame according to the synchronization errors of the acquisition units, and bidirectional message exchange synchronization based on a sender-receiver and unidirectional broadcast synchronization based on a transmitting end are combined, so that the limitation and the defects existing in the existing scheme are overcome, high synchronization precision of time synchronization of a transient recording type fault indicator and efficient utilization of energy are achieved, and the accuracy of synthesized zero-sequence current is guaranteed.
The above object of the present invention is achieved by the following technical solutions:
a time synchronization method applied to a transient recording type fault indicator comprises the following steps:
step one, a convergence unit broadcasts a synchronous beacon frame to an A-phase acquisition unit, a B-phase acquisition unit and a C-phase acquisition unit, and the A-phase acquisition unit, the B-phase acquisition unit and the C-phase acquisition unit synchronize respective local time with the convergence unit after receiving the synchronous beacon frame;
step two, the phase A acquisition unit, the phase B acquisition unit and the phase C acquisition unit periodically acquire phase A line load data and phase B line load data respectivelyLine load data and C-phase line load data are recorded by respectively using local clocks to record A-phase sampling time tAB phase sampling time tBC phase sampling time tCCorrespondingly packaging each same-phase synchronous byte, each phase line load data and each phase sampling time into each phase data frame, wherein each same-phase synchronous byte is positioned at the forefront end of the corresponding phase data frame;
after the A-phase acquisition unit sends the A-phase synchronization byte in the A-phase data frame, a timestamp is marked at the beginning of each byte after the A-phase synchronization byte in the A-phase data frame to form a local time scale of the A-phase acquisition unit
Figure GDA0002432103000000021
i is 0,1, …, n, n is a natural number greater than 1;
the B-phase acquisition unit and the C-phase acquisition unit listen to the A-phase data frame sent by the A-phase acquisition unit, a timestamp is marked at the beginning of each byte after the A-phase synchronization byte in the A-phase data frame, and local time stamps are respectively formed
Figure GDA0002432103000000031
And local time stamp
Figure GDA0002432103000000032
After the B-phase acquisition unit sends the B-phase synchronization byte in the B-phase data frame, a time stamp is marked at the beginning of each byte after the B-phase synchronization byte in the B-phase data frame to form a local time stamp of the B-phase acquisition unit
Figure GDA0002432103000000033
The A-phase acquisition unit and the C-phase acquisition unit listen to the B-phase data frame sent by the B-phase acquisition unit, a timestamp is marked at the beginning of each byte after the B-phase synchronization byte in the B-phase data frame, and local time stamps are respectively formed
Figure GDA0002432103000000034
And
Figure GDA0002432103000000035
after the C-phase acquisition unit sends the C-phase synchronization byte in the C-phase data frame, a timestamp is marked at the beginning of each byte after the C-phase synchronization byte in the C-phase data frame to form a local time scale of the C-phase acquisition unit
Figure GDA0002432103000000036
The phase A acquisition unit and the phase B acquisition unit listen to a phase C data frame sent by the phase C acquisition unit, a time stamp is marked at the beginning of each byte after the same-step byte of the phase C in the phase C data frame, and local time stamps are respectively formed
Figure GDA0002432103000000037
And local time stamp
Figure GDA0002432103000000038
Step three, the following formula is used for solving
Figure GDA0002432103000000039
Figure GDA00024321030000000310
Wherein: q ∈ { A, B };
fitting out by using least square method
Figure GDA00024321030000000311
Relative time drift αqcAnd a relative initial time offset thetaqcQ-phase acquisition unit drifting α according to relative timeqcAnd a relative initial time offset thetaqcBy
Figure GDA00024321030000000312
Adjust its local time.
Step four, the convergence unit monitors the A-phase data frame, the B-phase data frame and the C-phase data frame, and after receiving the synchronous bytes in each phase of data frameStamping a time stamp at the beginning of each byte after the synchronous byte in each phase data frame to respectively obtain
Figure GDA00024321030000000313
Determining △ the time offset between the phase A acquisition units and the phase C acquisition units byACAnd a time offset △ between the B-phase acquisition unit and the C-phase acquisition unitBC：
Figure GDA0002432103000000041
According to the time deviation △AC、△BCAdjusting sampling time t of A-phase and B-phase acquisition unitsA、tBAnd the synchronization of the A-phase data frame, the B-phase data frame and the C-phase data frame in the convergence unit is realized.
Step five, time deviation △ACOr △BCGreater than a threshold value TthAnd then, the convergence unit broadcasts a synchronous beacon frame to the acquisition unit, and the A-phase acquisition unit, the B-phase acquisition unit and the C-phase acquisition unit synchronize respective local time with the convergence unit after receiving the synchronous beacon frame.
Compared with the prior art, the invention has the following beneficial effects:
local synchronization between the acquisition units is realized by utilizing the broadcast characteristics of the acquisition units for actively reporting the data frame entrainment time scale and the wireless signals, the convergence unit realizes post-synchronization between the acquisition units based on the time difference between the receiving time scale and the transmitting time scale of the acquisition units, the convergence unit adaptively adjusts the period of the convergence unit for transmitting the time synchronization frame according to the synchronization error between the acquisition units, the number of synchronous beacon frames can be greatly reduced while the time synchronization precision is ensured, the contradiction between the time synchronization precision and the energy efficiency is solved, the precision of the synthesized zero-sequence current is ensured, and the accuracy of judging the ground fault of the fault indicator is greatly improved.
Drawings
Fig. 1 is a schematic diagram of listening data frames by each phase acquisition unit.
Detailed Description
The technical solution of the present invention is further specifically described below with reference to the accompanying drawings and specific embodiments.
A phase A acquisition unit, a phase B acquisition unit and a phase C acquisition unit are respectively installed on A, B, C three phases of the same place of an overhead line, a convergence unit is installed on a power tower close to the acquisition units, 433MHz or 2.4GHz wireless communication modules are arranged in the convergence unit, the phase A acquisition unit, the phase B acquisition unit and the phase C acquisition unit, and each acquisition unit is communicated with the other two acquisition units and the convergence unit through the wireless communication modules.
When an A-phase acquisition unit, a B-phase acquisition unit and a C-phase acquisition unit are installed on a line to start working, firstly, a convergence unit broadcasts a synchronous Beacon frame (Beacon) to the A-phase acquisition unit, the B-phase acquisition unit and the C-phase acquisition unit, the synchronous Beacon frame comprises a Beacon frame synchronous byte (SYNC), a convergence unit local time scale, a convergence unit ID number and a Beacon frame sequence number (SeqNum), the convergence unit local time scale is the convergence unit local time recorded in an MAC layer after the synchronous byte of the synchronous Beacon frame is sent, the A-phase, B-phase and C-phase acquisition units record respective local time in the MAC layer after receiving the Beacon frame synchronous byte of the synchronous Beacon frame, the local time of each phase acquisition unit is adjusted to be the convergence unit local time scale plus the decoding time and interrupt processing delay which are taken for converting the received radio wave message into bit data, thereby realizing that the local time of the A, B, C phase acquisition units is synchronized with the local time of the convergence unit.
Step two, the phase A acquisition unit, the phase B acquisition unit and the phase C acquisition unit respectively periodically acquire phase A line load data, phase B line load data and phase C line load data, and record phase A sampling time t by using a local clockAB phase sampling time tBC phase sampling time tCEach phase of line load data includes line current, field intensity, and the like, and each synchronization byte, each phase of line load data, and each phase of sampling time are correspondingly packaged into each phase of data frame, and each synchronization byte is located at the forefront end of the corresponding phase of data frame, that is: a phase synchronous byte, A phase line load data and A phase samplingSample time tACorrespondingly encapsulating the data frames into A phase data frames, wherein A phase synchronization bytes are positioned at the forefront end of the A phase data frames; b-phase synchronous byte, B-phase line load data and B-phase sampling time tBCorrespondingly packaging the data frame into a B-phase data frame, wherein the B-phase synchronization byte is positioned at the foremost end of the B-phase data frame; c-phase synchronous byte, C-phase line load data and C-phase sampling time tCCorrespondingly encapsulating into a C-phase data frame, wherein the C-phase synchronization byte is positioned at the forefront end of the C-phase data frame, and respectively sending an A-phase data frame, a B-phase data frame and a C-phase data frame to a convergence unit in an active reporting period, wherein the active reporting period is less than 10min, the active reporting sequence is A-phase, B-phase and C-phase line load data in the embodiment,
after the A-phase acquisition unit sends the A-phase synchronization byte in the A-phase data frame, a timestamp is marked at the beginning of each byte after the A-phase synchronization byte in the A-phase data frame to form a local time scale of the A-phase acquisition unit
Figure GDA0002432103000000051
n is a natural number greater than 1 (it is generally sufficient that n is 7),
the B-phase acquisition unit and the C-phase acquisition unit listen to the A-phase data frame sent by the A-phase acquisition unit, and after the A-phase synchronization byte of the A-phase data frame is received, a timestamp is marked at the beginning of each byte after the A-phase synchronization byte in the A-phase data frame to respectively form local time marks
Figure GDA0002432103000000052
And local time stamp
Figure GDA0002432103000000053
The B-phase acquisition unit sends a B-phase data frame to the convergence unit, wherein the B-phase data frame comprises B-phase synchronization bytes and local time marks
Figure GDA0002432103000000054
Phase B acquisition unit ID, phase B line load data and phase B sampling time tBThe B-phase synchronization byte is positioned at the forefront end of the B-phase data frame, and the B-phase acquisition unit finishes sending the B-phase synchronization word in the B-phase data frameAfter the section, a time stamp is marked at the beginning of each byte after the B same synchronization byte in the B-phase data frame to form a local time stamp of the B-phase acquisition unit
Figure GDA0002432103000000061
The A-phase acquisition unit and the C-phase acquisition unit listen to the B-phase data frame sent by the B-phase acquisition unit, and after the B-phase synchronization byte of the B-phase data frame is received, a timestamp is marked at the beginning of each byte after the B-phase synchronization byte in the B-phase data frame to respectively form local time stamps
Figure GDA0002432103000000062
And
Figure GDA0002432103000000063
the C-phase acquisition unit sends a C-phase data frame to the convergence unit, wherein the C-phase data frame comprises C-phase synchronization bytes,
Figure GDA0002432103000000064
C-phase acquisition unit ID, C-phase line load data and C-phase sampling time tCThe C-phase synchronous byte is positioned at the foremost end of the C-phase data frame, and after the C-phase acquisition unit sends the C-phase synchronous byte in the C-phase data frame, a timestamp is marked at the beginning of each byte after the C-phase synchronous byte in the C-phase data frame to form a local time scale of the C-phase acquisition unit
Figure GDA0002432103000000065
The phase A acquisition unit and the phase B acquisition unit listen to the phase C data frame sent by the phase C acquisition unit, and after the phase C synchronization byte of the phase C data frame is received, a timestamp is marked at the beginning of each byte after the phase C synchronization byte in the phase C data frame to respectively form a local time scale
Figure GDA0002432103000000066
And local time stamp
Figure GDA0002432103000000067
Thus, the A-phase acquisition unit obtains n sets of time scales
Figure GDA0002432103000000068
The B-phase acquisition unit obtains n groups of time marks
Figure GDA0002432103000000069
And step three, maintaining a local clock by each phase of acquisition unit by adopting a crystal oscillator, wherein the frequency change of the crystal oscillator is very small, and the crystal oscillator frequency of the acquisition unit is considered to be kept unchanged in a short period of time. Let us note that the m-phase acquisition unit time is Tm(t), the reference global time is denoted as t, so the following linear clock model can be adopted:
Tm(t) ═ α. t + θ equation (1)
Wherein α is the time drift (frequency difference) of the crystal oscillator in the m-phase acquisition unit, θ is the initial time offset (initial phase difference) of the crystal oscillator in the m-phase acquisition unit, m is equal to { A, B, C },
recording the time of the p-phase acquisition unit as Tp(t), the time synchronization model between the p-phase acquisition unit and the m-phase acquisition unit can be expressed as:
Tp(t)＝αpm·Tm(t)+θpmformula (2)
α thereinpmIs the relative time drift (relative frequency difference) between the crystal oscillator in the p-phase acquisition unit and the crystal oscillator in the m-phase acquisition unitpmIs the relative initial time offset (relative phase difference) between the crystal oscillator in the p-phase acquisition unit and the crystal oscillator in the m-phase acquisition unit, m, p ∈ { A, B, C }, m ≠ p,
in each active reporting period, the m acquisition unit is the last reported data frame, in this embodiment, m is the C phase, and as can be seen from step two, the q-phase acquisition unit can obtain n groups of time scales
Figure GDA0002432103000000071
Figure GDA0002432103000000072
q ∈ { A, B }, i ═ 0,1, …, n, and let
Figure GDA0002432103000000073
Is prepared by reacting with
Figure GDA0002432103000000074
The local time of the q-phase acquisition unit with the same global reference time is calculated by the following formula under the assumption that the propagation delay from the C-phase acquisition unit to the q-phase acquisition unit is equal to the propagation delay from the q-phase acquisition unit to the C-phase acquisition unit
Figure GDA0002432103000000075
Figure GDA0002432103000000076
Thus, n time-tick marks are obtained
Figure GDA0002432103000000077
i is 0,1, …, n, and α can be estimated by using the least square method according to the formula (4)qc、θqc：
Figure GDA0002432103000000078
Figure GDA0002432103000000079
q-phase acquisition unit drifting α according to relative timeqcAnd a relative initial time offset thetaqcBy
Figure GDA00024321030000000710
And the local time of the system is adjusted, so that the system is synchronized with the C-phase acquisition unit, and synchronous sampling of the A, B, C three-phase acquisition unit is ensured.
Suppose that in each active reporting period, the A phase, B phase and C phase acquisition units report each phase data frame in turn,
and step two, the A-phase acquisition unit can obtain n groups of time scales in each load data reporting period of the A-phase acquisition unit, the B-phase acquisition unit and the C-phase acquisition unit
Figure GDA0002432103000000081
i is 0,1, …, n, order
Figure GDA0002432103000000082
Is prepared by reacting with
Figure GDA0002432103000000083
The local time of the phase-A acquisition unit with the same global reference time is calculated by the following formula, assuming that the propagation delay from the phase-C acquisition unit to the phase-A acquisition unit is equal to the propagation delay from the phase-A acquisition unit to the phase-C acquisition unit
Figure GDA0002432103000000084
Figure GDA0002432103000000085
Thus, n time-tick marks are obtained
Figure GDA0002432103000000086
i is 0,1, …, n, and α can be estimated by the least squares method according to equation (8)AC、θAC：
Figure GDA0002432103000000087
Figure GDA0002432103000000088
The phase A acquisition unit drifts α according to relative timeACAnd a relative initial time offset thetaACBy
Figure GDA0002432103000000089
And adjusting the local time of the local time to realize the synchronization with the C-phase acquisition unit.
Step four, a convergence unit (root) listens to the A-phase data frame, the B-phase data frame and the C-phase data frame, after the synchronous bytes of each phase data frame are received, a time stamp is marked at the beginning of each byte after the synchronous bytes in each phase data frame, and the data frame can be obtained
Figure GDA00024321030000000810
i is 0,1, …, n, so that the convergence unit respectively obtains n groups of time scale pairs corresponding to the A-phase, B-phase and C-phase acquisition units
Figure GDA00024321030000000811
Figure GDA00024321030000000812
When i is 0,1, …, n, the time deviation △ between the a-phase and B-phase acquisition units and the C-phase acquisition unit is determined by the following formulaAC、△BC：
Figure GDA0002432103000000091
According to the time deviation △AC、△BCAdjusting sampling time t of A-phase and B-phase acquisition unitsA、tBAnd the synchronization of the A-phase data frame, the B-phase data frame and the C-phase data frame in the convergence unit is realized.
Step five, time deviation △ACOr △BCGreater than a threshold value TthIn time, the convergence unit broadcasts a synchronous beacon frame to the acquisition units, and each phase of acquisition units synchronizes to the convergence unit according to the step one and the threshold value TthThe method is set according to the period of the transient recording type fault indicator acquisition unit actively reporting the load data and the crystal oscillator precision adopted by the acquisition unit, and can be 10ms in order to ensure that the time deviation of the data acquisition among the acquisition units is less than half of the power frequency cycle.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (2)

1. A time synchronization method applied to a transient recording type fault indicator is characterized by comprising the following steps:
step one, a convergence unit broadcasts a synchronous beacon frame to an A-phase acquisition unit, a B-phase acquisition unit and a C-phase acquisition unit, and the A-phase acquisition unit, the B-phase acquisition unit and the C-phase acquisition unit synchronize respective local time with the convergence unit after receiving the synchronous beacon frame;
step two, the phase A acquisition unit, the phase B acquisition unit and the phase C acquisition unit respectively periodically acquire phase A line load data, phase B line load data and phase C line load data, and respectively record phase A sampling time t by utilizing local clocksAB phase sampling time tBC phase sampling time tCCorrespondingly packaging each same-phase synchronous byte, each phase line load data and each phase sampling time into each phase data frame, wherein each same-phase synchronous byte is positioned at the forefront end of the corresponding phase data frame;
after the A-phase acquisition unit sends the A-phase synchronization byte in the A-phase data frame, a timestamp is marked at the beginning of each byte after the A-phase synchronization byte in the A-phase data frame to form a local time scale of the A-phase acquisition unit
Figure FDA0002436002530000011
n is a natural number greater than 1;
the B-phase acquisition unit and the C-phase acquisition unit listen to the A-phase data frame sent by the A-phase acquisition unit, a timestamp is marked at the beginning of each byte after the A-phase synchronization byte in the A-phase data frame, and local time stamps are respectively formed
Figure FDA0002436002530000012
And local time stamp
Figure FDA0002436002530000013
The B-phase acquisition unit finishes sending the B-phase in the B-phase data frameAfter the synchronous byte, a time stamp is marked at the beginning of each byte after the B same synchronous byte in the B-phase data frame to form a local time scale of the B-phase acquisition unit
Figure FDA0002436002530000014
The A-phase acquisition unit and the C-phase acquisition unit listen to the B-phase data frame sent by the B-phase acquisition unit, a timestamp is marked at the beginning of each byte after the B-phase synchronization byte in the B-phase data frame, and local time stamps are respectively formed
Figure FDA0002436002530000015
And
Figure FDA0002436002530000016
after the C-phase acquisition unit sends the C-phase synchronization byte in the C-phase data frame, a timestamp is marked at the beginning of each byte after the C-phase synchronization byte in the C-phase data frame to form a local time scale of the C-phase acquisition unit
Figure FDA0002436002530000017
The phase A acquisition unit and the phase B acquisition unit listen to a phase C data frame sent by the phase C acquisition unit, a time stamp is marked at the beginning of each byte after the same-step byte of the phase C in the phase C data frame, and local time stamps are respectively formed
Figure FDA0002436002530000018
And local time stamp
Figure FDA0002436002530000019
Step three, the following formula is used for solving
Figure FDA0002436002530000021
Figure FDA0002436002530000022
Wherein: q ∈ { A, B };
fitting out by using least square method
Figure FDA0002436002530000023
Relative time drift αqcAnd a relative initial time offset thetaqcQ-phase acquisition unit drifting α according to relative timeqcAnd a relative initial time offset thetaqcBy
Figure FDA0002436002530000024
The local time of the user is adjusted,
further comprising the steps of:
the gathering unit monitors the A-phase data frame, the B-phase data frame and the C-phase data frame, and after receiving the synchronous bytes in each phase of data frame, a time stamp is marked at the beginning of each byte after the synchronous bytes in each phase of data frame to respectively obtain
Figure FDA0002436002530000025
Determining △ the time offset between the phase A acquisition units and the phase C acquisition units byACAnd a time offset △ between the B-phase acquisition unit and the C-phase acquisition unitBC：
Figure FDA0002436002530000026
According to the time deviation △AC、△BCAdjusting sampling time t of A-phase and B-phase acquisition unitsA、tBAnd the synchronization of the A-phase data frame, the B-phase data frame and the C-phase data frame in the convergence unit is realized.
2. The method of claim 1, further comprising the steps of:
when time deviation deltaACOr △BCGreater than a threshold value TthWhen, convergeThe gathering unit broadcasts a synchronous beacon frame to the acquisition units, and the A-phase acquisition unit, the B-phase acquisition unit and the C-phase acquisition unit synchronize respective local time with the gathering unit after receiving the synchronous beacon frame.
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CN108680824A (en) * 2018-05-16 2018-10-19 南方电网科学研究院有限责任公司 Distributed Wave Recording Synchronization Method, Device, Equipment and Medium
CN108983044B (en) * 2018-08-06 2021-02-19 北京恒源利通电力技术有限公司 Overhead line three-phase current synchronous wave recording method based on RF wireless communication
CN109116187B (en) * 2018-08-31 2020-07-03 东方电子股份有限公司 Wave recording synchronization method applied to transient wave recording type fault indicator
CN109298362B (en) * 2018-09-10 2020-10-16 国网江苏省电力有限公司电力科学研究院 Three-phase synchronization precision testing method, device and system for distribution line fault indicator
CN109714123B (en) * 2018-12-06 2020-08-14 国网江苏省电力有限公司无锡供电分公司 Time synchronization method and system of transient wave recording device of distribution network
CN109709422B (en) * 2018-12-27 2021-03-09 中国南方电网有限责任公司 Clock drift elimination method and device
CN111579918B (en) * 2020-04-13 2022-03-04 上海紫通信息科技有限公司 Sampling synchronous correction method for transient recording type fault indicator
CN114594669B (en) * 2020-12-04 2023-07-21 青岛鼎信通讯股份有限公司 Accurate synchronization method for transient wave recording type fault indicator
CN114089044B (en) * 2021-11-22 2023-04-28 广东电网有限责任公司 Line impedance measurement method, computer equipment and storage medium

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103217625A (en) * 2013-03-20 2013-07-24 山东理工大学 Low current earth fault location method based on transient state current waveform comparison
CN104764971A (en) * 2015-03-18 2015-07-08 广东电网有限责任公司电力科学研究院 Power distribution network overhead line single-phase grounding fault recognition positioning method and fault indicator
CN106353640A (en) * 2016-09-05 2017-01-25 国网山东省电力公司青岛供电公司 Fault location method, device and system for distribution lines
CN106501656A (en) * 2016-10-12 2017-03-15 国网上海市电力公司 A kind of on-line acquisition system of distribution line failure waveform
WO2017049224A1 (en) * 2015-09-18 2017-03-23 Schweitzer Engineering Laboratories, Inc. Time-domain line protection of electric power delivery systems
CN106771870A (en) * 2016-12-26 2017-05-31 北京国电通网络技术有限公司 A kind of distribution net work earthing fault localization method and system
CN107329040A (en) * 2017-06-16 2017-11-07 国电南瑞科技股份有限公司 A kind of power distribution automation main station system single-phase earth fault localization method based on transient state recorder data
CN107453405A (en) * 2017-08-14 2017-12-08 光科技股份有限公司 A kind of Fault Locating Method and system based on transient state recording fault detector

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RS63098B1 (en) * 2013-03-29 2022-04-29 Beijing Inhand Networks Technology Co Ltd Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103217625A (en) * 2013-03-20 2013-07-24 山东理工大学 Low current earth fault location method based on transient state current waveform comparison
CN104764971A (en) * 2015-03-18 2015-07-08 广东电网有限责任公司电力科学研究院 Power distribution network overhead line single-phase grounding fault recognition positioning method and fault indicator
WO2017049224A1 (en) * 2015-09-18 2017-03-23 Schweitzer Engineering Laboratories, Inc. Time-domain line protection of electric power delivery systems
CN106353640A (en) * 2016-09-05 2017-01-25 国网山东省电力公司青岛供电公司 Fault location method, device and system for distribution lines
CN106501656A (en) * 2016-10-12 2017-03-15 国网上海市电力公司 A kind of on-line acquisition system of distribution line failure waveform
CN106771870A (en) * 2016-12-26 2017-05-31 北京国电通网络技术有限公司 A kind of distribution net work earthing fault localization method and system
CN107329040A (en) * 2017-06-16 2017-11-07 国电南瑞科技股份有限公司 A kind of power distribution automation main station system single-phase earth fault localization method based on transient state recorder data
CN107453405A (en) * 2017-08-14 2017-12-08 光科技股份有限公司 A kind of Fault Locating Method and system based on transient state recording fault detector

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"一种配电网单相接地故障解决方法";张书翰等;《电力讯息》;20170212;全文 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109828183A (en) * 2018-12-04 2019-05-31 国网江苏省电力有限公司电力科学研究院 Synchronous waveform bearing calibration and its system suitable for transient state recording type fault detector

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