CN110209044A - A kind of distribution terminal time synchronization method compared using power grid power frequency component periodic quantity - Google Patents
A kind of distribution terminal time synchronization method compared using power grid power frequency component periodic quantity Download PDFInfo
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- CN110209044A CN110209044A CN201910603364.1A CN201910603364A CN110209044A CN 110209044 A CN110209044 A CN 110209044A CN 201910603364 A CN201910603364 A CN 201910603364A CN 110209044 A CN110209044 A CN 110209044A
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- 230000006854 communication Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
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- 238000001514 detection method Methods 0.000 description 2
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Classifications
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
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- H02J13/0013—
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- 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
- Y04S10/16—Electric power substations
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- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
A method of it is set time using the power frequency component periodic quantity of network voltage as reference quantity, it can be improved the clock synchronization precision between the different distribution terminals on distribution line, it is characterized by: the power frequency component periodic quantity of power grid is real-time change, it and is all identical in the power frequency component periodic quantity that different place acquisitions calculates, utilize this feature, it is compared by power frequency component periodic quantity, realizes that clock is synchronous, reduce the synchronous error of clock.By means of the invention it is possible to improve the clock synchronization precision on same distribution line between different distribution terminals.
Description
Technical field
It is a kind of to be compared using power grid power frequency component periodic quantity, clock jitter is calculated, realizes clock between distribution terminal
The method being consistent, belongs to power system automatic field.Suitable on same distribution line all distribution terminals or
Keep clock synchronous between the distribution terminal on different distribution lines on same bus.
Background technique
Distribution feeder automation system belongs to a kind of power distribution equipment constructed on the basis of integrated communication network, leads to
It crosses measuring technique, automatic control technology and sensor and reaches the purpose for guaranteeing safe operation of electric network, power distribution network can be promoted conscientiously
Real work efficiency and quality.Highly-safe, stability is strong and energy consumption is the essential characteristic of distribution feeder automation less, so
Say that distribution feeder automation system belongs to the important products of modern advanced.Current generation is with China's level of information technology
Promotion, all kinds of automated information control technologies by actively be applied to distribution feeder automation system among, electric power resource
Utilization rate significantly promoted, and be conducive to the reduction of cost.Distribution feeder automation system in China's is mainly borrowed at this stage
Automatic circuit and the perseveration of segmentation is helped to realize the purpose of identification and detection feeder fault.
Under distribution feeder automation system normal condition, monitor in real time feeder line section switch and interconnection switch state and
Feeder current, voltage condition realize a distant place for line switching or switch closing and switch opening operate on the spot.In failure, failure note is obtained
Record, and energy automatic discrimination and isolation feeder fault section, rapidly restore electricity to non-faulting region.Wherein fault location, isolation
Restore significant to the reliability for improving power supply and the power off time for shortening non-faulting area with automatic, is feed automation
One major function.In order to realize feeder automation, need that distribution terminal is installed at block switch on distribution line (feeder line)
Device (FTU) monitors electric current, the voltage condition of feeder line, and realizes to close a floodgate to the separating brake of block switch and remotely control.Different distribution
The clock of terminal is consistent, and has important influence for the breakdown judge of distribution line, isolation and service restoration.
In order to be consistent distribution terminal clock on same distribution line, it is common practice to install GPS in substation
Or big dipper clock provides the clock signal of standard, the clock for being responsible for terminal on distribution line by substation's distribution terminal is synchronous,
The distribution terminal on feeder line is sent by standard clock signal, the distribution terminal on distribution line is according to the standard time clock pair received
Local clock is adjusted.When common time synchronization method includes the time synchronization method of IEC 60870-5-101/104, simple network
Between 1588 clock synchronization agreement of agreement SNTP, IEEE etc..Distribution is wherein carried out using the clock synchronization order of IEC 60870-5-101/104
The clock synchronization of terminal, the delay of network are difficult to calculate, and clock synchronization application condition is big, usually in second grade.SNTP agreement uses client/service
Device working method, server are mentioned by receiving time reference of the GPS signal as system, client computer by regular visit server
The Time Service of confession obtains correct time information, and adjusts the system clock of oneself, achievees the purpose that network clocking is synchronous.?
In the network environment of feeder automation, SNTP clock synchronization error is more than 10ms.IEC 61588 is cooperated using hardware and software simultaneously,
More accurate Timing Synchronization is obtained, the clock synchronization precision of Microsecond grade may be implemented.But IEC 61588 needs router, interchanger
It supports, is difficult to carry out in the network environment of feeder automation.
Summary of the invention
Goal of the invention is a kind of method for proposing clock synchronization, using power grid power frequency component periodic quantity be change constantly, it is different
This identical feature of power grid power frequency component periodic quantity of place synchronization, using power grid power frequency component periodic quantity as distribution terminal
The reference quantity of clock adjustment realizes that clock synchronization error is less than 1ms between distribution terminal to improve the precision of distribution terminal clock synchronization.
The purpose of the present invention can be achieved through the following technical solutions.
A kind of distribution terminal time synchronization method of the power frequency component periodic quantity as reference quantity of benefit network voltage, realization system
Including the distribution terminal (FTU) and communication system on same distribution line, as shown in Figure 1.Distribution terminal by communication system into
Row information exchange.
The distribution terminal (FTU) includes at block switch on the FTU and distribution line at substation bus bar
FTU.The information of voltage of FTU monitoring substation bus at substation bus bar.FTU monitoring and acquisition distribution wire on distribution line
The division action message of the electric current of road transport row, information of voltage, switch, the line information according to acquisition carry out line fault judgement.
Clock synchronization information is received simultaneously, the clock of the local FTU is adjusted.
Communication of the communication system between each distribution terminal FTU provides channel.
FTU0 is the distribution terminal of monitoring substation busbar voltage, is mounted on substation, the GPS of FTU0 and substation or
Person's dipper system is connected, as standard clock source.FTU11, FTU12, FTU13 are mounted on distribution line 1(feeder line 1) on be segmented and open
Distribution terminal at pass, FTU11, FTU12, FTU13 need to keep clock consistent with FTU0.
All distribution terminals can be acquired with separate voltage power frequency component (by taking AB line voltage as an example).
The timestamp of clock synchronization is formed using 64 without symbol floating number, and integer part is 32, head, and fractional part is rear 32
Position, unit is the second, and the time is relative to zero point on January 1st, 1900.
The process of whole system clock synchronization is as shown in Figure 2: upper all distribution terminal of the FTU0 on same distribution line
(FTU11, FTU12, FTU13) sends broadcast message, informs that FTU0 is the standard clock source of one's respective area, the distribution terminal on route
FTU11, FTU12, FTU13 carry out clock as standard time clock using FTU0 and synchronize.
FTU11 sends clock synchronization request command to FTU0, while FTU11 starts collection voltages (by taking AB line voltage as an example) signal
And power frequency component periodic quantity is calculated, each cycle calculates once, records beginning (the 0 ° of phase) moment of each cycle.
After FTU0 receives clock synchronization request command, starts to acquire voltage (by taking the AB line voltage as an example) signal of power grid and calculate work
Frequency component periodic quantity, each cycle calculate once, and the 1st cycle of record starts T0 and continuous 5 week at the time of (0 ° of phase)
At the beginning of wave.After 5 cycles, stop calculating.
After the completion of the periodic quantity of continuous 5 cycles calculates, FTU0 sends clock synchronization response command, command information packet to FTU11
The initial time of initial time and continuous 5 cycles containing the 1st cycle.
After FTU11 receives the clock synchronization acknowledgement command of FTU0 transmission, dwelling period value is calculated.
FTU11 calculates the cycle value of the cycle of FTU0 acquisition according to the clock synchronization response message received.Using two neighboring
The initial time of cycle calculates periodic quantity t0i, t0i=T0i-T0i-1, i is since 1.
FTU11 calculates periodic quantity t1 according to the initial time of local cyclei, t1i=T1i-T1i-1, i is since 1.
FTU11 is compared since the 1st local periodic quantity with the FTU0 periodic quantity acquired, until to N-5
A periodic quantity, calculates separately:
In above formulat1 (i+k-1) Indicate the periodic quantity of FTU11 record,t0 (i) Indicate the periodic quantity of FTU0 record,kIndicate FTU11 note
The of recordkA periodic quantity,kSince 1.It choosesρValue is minimum correspondingk, at the time of starting corresponding with k-th of cycle of FTU11
T1k-1T0 is identical at the time of return with FTU0, then clock jitter is Toffset= T0- T1k-1。
FTU11 carries out clock correction
T = T+Toffset
The same FTU11 of clock synchronization process of other FTU such as FTU12, step are identical as [0014] ~ [0021].
Detailed description of the invention
Fig. 1 is the structure chart of feed line automatization system；Fig. 2 is distribution terminal clock synchronization communication process figure.
Specific embodiment
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 clock of the FTU0 as FTU11, FTU12 on feeder line etc..FTU11 is on feeder line at block switch
FTU, FTU11 need to keep clock consistent with FTU0.
FTU0, FTU11 etc. have the function of voltage, electric current on detection feeder line.
FTU0, FTU11 etc. are connected by communication network.
Claims (5)
1. a kind of using power grid power frequency component periodic quantity as the distribution terminal time synchronization method of reference quantity, which is characterized in that become
Distribution terminal at the bus of power station utilizes the variation of power grid power frequency component periodic quantity moment and synchronization as standard clock source
This identical feature of power grid power frequency component periodic quantity that different distribution terminals detect, is compared by power frequency component periodic quantity, meter
The time difference between distribution terminal is calculated, is set time, to improve the precision of clock synchronization.
2. according to claim 1, which is characterized in that on the standard clock source distribution terminal and distribution line of substation
The voltage power frequency component that distribution terminal chooses same phase (such as AB line) at block switch carries out the acquisition of power grid power frequency component periodic quantity
And calculating, with grid voltage phase-angle be in 0 ° at the time of for each cycle initial time.
3. according to claim 1, described in 2, which is characterized in that the distribution terminal (from clock) on route sends clock synchronization request life
After order, the power frequency component periodic quantity for starting voltage signal immediately is calculated, and records the initial time of each cycle, calculates its power frequency
Component periodic quantity.
4. according to claim 1, described in 2, which is characterized in that the distribution terminal (master clock) of substation receives clock synchronization request
After order, the power frequency component periodic quantity for starting voltage signal is calculated, and records the initial time of the 1st cycle and 5 continuous
The initial time of cycle, sends clock synchronization response command, and command information includes the initial time of the 1st cycle and 5 continuous
The initial time of cycle.
5. according to claim 1, described in 2,3,4, which is characterized in that master-salve clock is compared by power frequency component periodic quantity, is found out
The cycle corresponding relationship of master-salve clock calculates clock jitter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113341680B (en) * | 2021-06-30 | 2022-05-27 | 广东电网有限责任公司 | Time synchronization method and device for distribution Internet of things end device |
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