CN108762048A - A method of realizing distribution terminal clock synchronization using power frequency current signal - Google Patents
A method of realizing distribution terminal clock synchronization using power frequency current signal Download PDFInfo
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- CN108762048A CN108762048A CN201810558117.XA CN201810558117A CN108762048A CN 108762048 A CN108762048 A CN 108762048A CN 201810558117 A CN201810558117 A CN 201810558117A CN 108762048 A CN108762048 A CN 108762048A
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- clock synchronization
- clock
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- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G7/00—Synchronisation
Abstract
The present invention be it is a kind of using power frequency (50Hz) current signal improve distribution line on different distribution terminals between clock synchronization precision method, this method is using the phase of power current as the reference quantity of clock synchronization, it is characterised in that：The phase of the A phase power currents acquired in the same time using all distribution terminals on same distribution line is this identical feature, in A phases power current simultaneously in 0 ° of phase (same phase) at the time of correction time error, realize that clock synchronizes.By means of the invention it is possible to improve the precision of clock synchronization between different distribution terminals on same distribution line.
Description
Technical field
A method of clock is consistent between making distribution terminal using power frequency (50Hz) current signal, belongs to power train
System automatic field.It is synchronized suitable for the retention time between the distribution terminal on same distribution line.
Background technology
Feeder automation is the important component of power distribution automation, utilizes the power distribution automation on distribution line
Terminal (abbreviation distribution terminal), monitors the operation conditions of distribution line, finds line fault in time, is diagnosed to be fault section and incites somebody to action
Fault section is isolated, and the power supply to non-faulting section is restored.Its basic principle is：By the distribution cable of ring network structure open loop operation
Road is divided into multiple power supply sections by block switch, when some section breaks down, in time by block switch tripping, isolation event
Barrier section then restores electricity rapidly the non-faulting section of dead electricity due to line failure, so as to avoid whole circuit
Continuous dead electricity, reduces scope of power outage, shortens power off time, improves power supply reliability.In order to realize feeder automation, need
Distributing Terminal Assembly to be installed on feeder line at block switch, monitors electric current, the voltage condition of feeder line, and realize to block switch
Separating brake combined floodgate remote control.The clock of different distribution terminals is consistent, for the breakdown judge of distribution line, isolation and confession
Electricity restores have important influence.
In order to keep the consistency of the time of distribution terminal on same distribution line, it is common practice to be installed in substation
GPS or big dipper clock provide the time signal of standard, and it is same to be responsible for the time of terminal on distribution line by substation's distribution terminal
Step, is sent to the distribution terminal on feeder line, the distribution terminal on distribution line is according to the standard time pair received by the standard time
The local time is adjusted.When common setting means include the setting means of IEC 60870-5-101/104, simple network
Between 1588 clock synchronization agreement of agreement SNTP, IEEE etc..The clock synchronization order of IEC 60870-5-101/104 is wherein used to carry out distribution
The clock synchronization of terminal, the delay of network are difficult to calculate, and clock synchronization application condition is big, usually in 10ms~50ms.SNTP agreements are using visitor
Family/server working method, server are used as the time reference of system by receiving GPS signal, and client computer passes through regular visit
The Time Service that server provides obtains correct time information, and adjusts the system clock of oneself, reaches network time synchronization
Purpose.In the network environment of feeder automation, the clock synchronization error of SNTP is more than 10ms.The hypothesis pair of 61588 agreements of IEC
When network in transmission path be it is symmetrical, i.e., message by master clock to from time and the message used in clock by from clock to it is main when
Time used in clock is identical, is postponed by continuous corrective network and clock jitter, to realize that clock synchronizes.IEC 61588
The precision of clock synchronization agreement is relatively high, but requires the delay of network also relatively stringenter, the network rings of current feeder automation
Border is difficult to meet the requirement of IEC 61588.
Invention content
Goal of the invention:
The purpose of the present invention is to propose to a kind of method of clock clock synchronization, using the phase information of distribution line phase current as
The reference quantity of distribution terminal time adjustment, improves the precision of distribution terminal clock clock synchronization, realizes clock synchronization error between distribution terminal
Less than 1ms.
The purpose of the present invention can be achieved through the following technical solutions:
A method of realizing distribution terminal clock synchronization using power frequency current signal, which is characterized in that including same distribution
Distribution terminal (FTU) on circuit and communication system, as shown in Figure 1.Distribution terminal carries out information exchange by communication system.
The distribution terminal (FTU) includes the FTU and distribution line at the distribution line gate out switch of substation
FTU at upper block switch.FTU is monitored and the division information of the electric current of acquisition feeder line operation, information of voltage, switch, foundation are adopted
The feeder line information of collection carries out feeder fault judgement.FTU sends or receives clock synchronization information simultaneously, is carried out to the clock of the locals FTU
Adjustment.
Communication of the communication system between each distribution terminal (FTU) provides channel.
FTU0 is distribution terminal at the distribution line gate out switch of substation, the GPS connections of FTU0 and substation,
Standard clock source as other FTU on distribution line.FTU1, FTU2, FTU3 are the distribution at block switch on distribution line
Terminal, FTU1, FTU2, FTU3 need to keep clock consistent with FTU0.
FTU0, FTU1, FTU2, FTU3 etc. select to send clock synchronization at the time of detecting that power frequency current signal phase is 0 °
Command message.
The flow of whole system clock synchronization is as shown in Figure 2：
FTU0 (will engrave as T0) at this time at the time of monitoring that power frequency A phase current signals phase angle is 0 °, match to same
Upper all distribution terminals (FTU1, FTU2, FTU3) in electric line send broadcast message, inform that FTU0 is the mark on this circuit
Quasi- clock source, distribution terminal FTU1, FTU2, FTU3 on circuit carry out time synchronization by standard time clock of FTU0；
FTU1 equipment receives the clock synchronization broadcast of FTU0 at the T1 moment, is ready for clock synchronization；
FTU1 monitors (to be denoted as T2) at the time of A phase alternating current signal phases are 0 °, to FTU0 transmission clock synchronization request lives
It enables；
FTU0 receives the clock synchronization request of FTU1 at the T3 moment, and FTU0 is detected that current signal phase is before the T3 moment
0 ° of nearest moment is denoted as T4；
FTU0 monitors (to be denoted as T5) at the time of A phase alternating current signal phases angle is 0 °, to FTU1 transmission clock synchronization responses
Order；
FTU1 receives the clock synchronization feedback signal of FTU0 at the T6 moment, and FTU1 detects current signal phase before the T6 moment
It is denoted as T7 for 0 ° of nearest moment；
The propagation time between FTU0 to FTU1 is corrected,
If | (T3-T4)-(T6-T7) | < 10ms are not necessarily to correction,
If | (T3-T4)-(T6-T7) | >=10ms, if (T3-T4)>10, T7=T7-20ms
(if T6-T7)>10, T4=T4-20ms
Calculate the time deviation T of FTU1offset
Toffset=[(T7-T5)+(T2-T4)]/2
FTU1 carries out time adjustment
T=T-Toffset
The same FTU1 of clock synchronization process of FTU2, step are identical as (2)~(9).
Description of the drawings
Fig. 1 is the structure chart of feed line automatization system
Fig. 2 is distribution terminal clock synchronization communication process figure
Specific implementation mode
Specific embodiments of the present invention as shown in Fig. 2, but not limited to this example.
FTU0 is the FTU at the feeder line gate out switch of substation, when substation GPS provides standard for FTU0
Clock.Standard time clocks of the FTU0 as FTU1, FTU2 on feeder line etc..FTU1 is the FTU at block switch on feeder line,
FTU1 needs to keep clock consistent with FTU0.
FTU0, FTU1 etc. have the function of electric current on detection feeder line.
FTU0, FTU1 etc. have the function of electric current on detection feeder line.
Claims (3)
1. a kind of method using power frequency current signal secondary distribution terminal clock clock synchronization, which is characterized in that with substation's distribution
The distribution terminal of line outlet switch is examined as standard clock source using different distribution terminal synchronizations on same distribution line
This identical feature with phase (such as A phases) phase of power current measured is detecting that current phase is in predetermined phase (such as
0 °) when into row clock clock synchronization, to improve the precision of clock synchronization.
2. according to claim 1, which is characterized in that standard clock source distribution terminal is detecting that electric current power frequency component is in
When predetermined phase (such as 0 °), clock synchronization order and response clock synchronization order are initiated.
3. according to claim 1, which is characterized in that distribution terminal is detecting electric current work at block switch on distribution line
When frequency signal is in predetermined phase (such as 0 °), time inquiring and response are carried out.
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| CN201810558117.XA CN108762048A (en) | 2018-06-01 | 2018-06-01 | A method of realizing distribution terminal clock synchronization using power frequency current signal |
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| CN201810558117.XA CN108762048A (en) | 2018-06-01 | 2018-06-01 | A method of realizing distribution terminal clock synchronization using power frequency current signal |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109343334A (en) * | 2018-12-11 | 2019-02-15 | 齐鲁工业大学 | A kind of distribution terminal time synchronization method using signal injection method |
| CN109343333A (en) * | 2018-12-11 | 2019-02-15 | 齐鲁工业大学 | A kind of distribution terminal time synchronization method and system using voltage power frequency component |
| CN110209044A (en) * | 2019-07-05 | 2019-09-06 | 齐鲁工业大学 | A kind of distribution terminal time synchronization method compared using power grid power frequency component periodic quantity |
| CN110543093A (en) * | 2019-07-05 | 2019-12-06 | 齐鲁工业大学 | Power distribution terminal time synchronization method using power grid frequency value comparison |
| CN113783650A (en) * | 2021-08-25 | 2021-12-10 | 浙江万胜智能科技股份有限公司 | Method for realizing accurate time synchronization of intelligent electric meter and intelligent terminal based on characteristic current |
| CN113917833A (en) * | 2021-09-18 | 2022-01-11 | 广西电网有限责任公司柳州供电局 | Time synchronization device and time synchronization method |
| CN114337892A (en) * | 2021-12-27 | 2022-04-12 | 重庆玖奇科技有限公司 | Multi-device clock synchronization method based on low-voltage distribution network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109343334A (en) * | 2018-12-11 | 2019-02-15 | 齐鲁工业大学 | A kind of distribution terminal time synchronization method using signal injection method |
| CN109343333A (en) * | 2018-12-11 | 2019-02-15 | 齐鲁工业大学 | A kind of distribution terminal time synchronization method and system using voltage power frequency component |
| CN110209044A (en) * | 2019-07-05 | 2019-09-06 | 齐鲁工业大学 | A kind of distribution terminal time synchronization method compared using power grid power frequency component periodic quantity |
| CN110543093A (en) * | 2019-07-05 | 2019-12-06 | 齐鲁工业大学 | Power distribution terminal time synchronization method using power grid frequency value comparison |
| CN113783650A (en) * | 2021-08-25 | 2021-12-10 | 浙江万胜智能科技股份有限公司 | Method for realizing accurate time synchronization of intelligent electric meter and intelligent terminal based on characteristic current |
| CN113917833A (en) * | 2021-09-18 | 2022-01-11 | 广西电网有限责任公司柳州供电局 | Time synchronization device and time synchronization method |
| CN114337892A (en) * | 2021-12-27 | 2022-04-12 | 重庆玖奇科技有限公司 | Multi-device clock synchronization method based on low-voltage distribution network |
| CN114337892B (en) * | 2021-12-27 | 2023-11-10 | 重庆玖奇科技有限公司 | Multi-equipment clock synchronization method based on low-voltage distribution network |
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Application publication date: 20181106 |