CN206878834U - High-accuracy network time service equipment based on alternating supply voltage phase difference correction - Google Patents
High-accuracy network time service equipment based on alternating supply voltage phase difference correction Download PDFInfo
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- CN206878834U CN206878834U CN201720668243.1U CN201720668243U CN206878834U CN 206878834 U CN206878834 U CN 206878834U CN 201720668243 U CN201720668243 U CN 201720668243U CN 206878834 U CN206878834 U CN 206878834U
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Abstract
High-accuracy network time service equipment based on alternating supply voltage phase difference correction, including time service end equipment and receive two parts of end equipment, wherein, time service end equipment connects time service terminal voltage sensing device (3) by time service server (1) and formed, and receives end equipment and is formed by receiving time service device (4) connection receiving terminal voltage-phase detection means (5)；Time service end equipment passes through communication network (2) connection with end equipment is received.The devices such as antenna need not be installed, without any restrictions, set voltage-phase to detect the uneven change of network transmission, the error of corrective networks time service in time calibration in network.Realize high accuracy, simple time calibration in network service.Time service precision can be stably reached within 1ms, and the place of time service is needed suitable for the installation Alternating Current Power Supply facility such as all factories and miness, enterprise, government bodies, educational institution.
Description
Technical field
Network time synchronization technology is the utility model is related to, is based especially on the high-precision of alternating supply voltage phase difference correction
Spend time calibration in network equipment.
Background technology
Current Pnmary Synchronization Service of Timing, including shortwave time service, long-wave time service, the time service of the GPS/ Big Dippeves, dialing are awarded
When, the mode such as internet time service (NTP) and SDH transmission network time services.Wherein：For Time synchronization technique precision, long-wave time service
1ms is can reach, shortwave time service can reach 1~10ms, be mainly used in military and navigation, still not civilian.It is same in the dialing time
The place that step technology needs to have telephone access can all realize long-range time service.Can extensive use, but precision is not high, and often error reaches
To 100ms, it is impossible to be used in the higher civil area of required precision between industry and military use and time service, such as thing in power system
The 2ms requirements required in part order.Believed using GPS and Big Dipper time service, it is necessary to receive the time service from satellite using satellite antenna
Number, although time service precision is high, many industries for needing time service, such as power plant, government etc., most equipment installations indoors, can not
Antenna is disposed, influences the application of which.
In internet time simultaneous techniques, NTP NTP is typically represented as.This mode is in LAN
It is widely used.But the time service precision of this mode is not high, network delay is larger, the unbalanced feelings of network traffics
Under condition, time service precision was very poor, sometimes even over 1 second.The requirement of most applications can not be met.Required precision is higher between time service
Application in, can not be competent at.
In SDH transmission network time services, this method precision is high, and 100ns time precisions can be achieved.But it can be only applied to specially
With in communication network, or special hardware is needed, above time service mode can not take into account the contradiction of practicality and precision, it is impossible to wide
General popularization.
Commonly using traditional industrial and civilian time service mode mainly includes time calibration in network and the species of GPS/ big-dipper satellites time service two
Type.Time calibration in network is widely used, should be because by network delay and transmitting unbalanced shadow available for almost all of occasion
Ring, time service precision is not high, and often error exceedes 10ms or even hundreds of milliseconds, under worst condition, after some time it is possible to reach more than 1 second.Satellite
Time service precision is very high, but must install reception antenna, in factories and miness and building interior, can not receive satellite-signal, application
Scope is very restricted.
The clock that Chinese patent application 200810044872.2 is disclosed towards synchronous phase measuring in power system synchronously fills
Put, its local clock synchronization module connects composition sync identification network by procotol, and antenna and gps time receiving module connect
The signal of temporal information is received, primary module parses temporal information, and the local real-time clock in primary module is reset：Primary module
The temporal information obtained sends slave module by procotol, and the local real-time clock in slave module is reset, from
And complete the time service of the local clock synchronization module as sync identification network principal and subordinate's module.Improved technology Patents documents are public
Open less.No matter in civilian or industrial use, ac power supply method is all employed, to be lived, produce the energy and power.
The transmission of electricity in current China, distribution network, big area networking is had been realized in, or even the whole nation has all connected into unified network.
In power network, because the needs of generator synchronous operation, the electric voltage frequency and phase of full electric network must be all consistent.Currently, examine
It is very simple to survey voltage-phase, we can obtain alternating voltage from electrical system bus voltage transformer (PT), or directly
Take family, engineering 220/380V voltages in certain phase, as input value, input signal is easily sought very much.Under present case, survey
It is highly developed technology to measure voltage phase angle, has use inside nearly all power equipment.
Improved technology Patents documents disclose less.
Utility model content
The purpose of this utility model is to provide the high-accuracy network time service equipment based on alternating supply voltage phase difference correction,
It can conveniently practice indoors, without installing antenna, improve network time service precision by voltage-phase, the μ of highest 100 can be achieved
Time service precision within s, overcoming legacy network time service, either cost is high or the drawbacks of precision is too low.
The purpose of this utility model will be realized by following technical measures：Including time service end equipment and receive end equipment two
Individual part, wherein, time service end equipment by time service server connection time service terminal voltage sensing device form, receive end equipment by
Receive time service device connection receiving terminal voltage-phase detection means to form；Time service end equipment and receive end equipment and pass through communication network
Connection.
Especially, every group of time service end equipment is at least connected with two groups and receives end equipment.
Especially, communication network using ICP/IP protocol in Ethernet, optical fiber and power carrier mode network type.
Especially, time service end equipment only to receive end equipment send voltage from the negative zero crossing phase angle become a full member be zero when
Between.
Especially, time service server is configured to ntp server.
Especially, time service terminal voltage sensing device is zero-crossing examination device, is connected to 220V/380V or special
Voltage transformer pt on, receive the phase signals in A/B/C three-phase voltages, voltage-phase be 0 degree when send pulse.
The advantages of the utility model and effect：The devices such as antenna need not be installed, without any restrictions, in time calibration in network
Voltage-phase is set to detect the uneven change of network transmission, the error of corrective networks time service.High accuracy is realized, simple network is awarded
When service.Time service precision can be stably reached within 1ms, pacified suitable for all factories and miness, enterprise, government bodies, educational institution etc.
Dress Alternating Current Power Supply facility needs the place of time service.
Brief description of the drawings
Fig. 1 is the mutual relation of electric voltage schematic diagram of any two points in network.
Fig. 2 is the system attachment structure schematic diagram at work of the utility model embodiment 1.
Reference includes：
Time service server 1, communication network 2, time service terminal voltage sensing device 3, receive time service device 4, receiving terminal electricity
Press phase detection device 5.
Embodiment
The utility model principle is voltage phase difference, voltage phase difference be present between any two point in power network
From two aspects：On the one hand, phase difference caused by transmission range, the phase difference are electric energy according to passing through in light velocity transmitting procedure
Caused by transmission range, with 100 kilometers of calculating, voltage phase difference only has 100/300000 second=0.33 millisecond, and at this 2 points
Phase difference is determined by distance, will not be changed.On the other hand, because phase difference caused by the equipment such as transformer, in power system,
Transformer has available for different connection modes, the difference of the mode of connection, it is possible to create fixed voltage phase difference.Such as star triangle wiring side
Formula, it is possible to create 30 degree of phase angle difference.This phase angle difference because the transformer connection mode of process determines, it is determined that after will not change.
As can be seen here, in distribution network, the time difference of wantonly 2 points of voltage arrival same phase is fixed, can simply be examined very much
Measure the time difference.Because ac distribution network is ubiquitous, each family, unit employ 220V/380V Alternating Current Power Supplies system
System.
Accompanying drawing 1 is described in Alternating Current Power Supply distribution system synchronised grids, different location voltage-phase time relationship.Connection
In any two place of power network, time difference when voltage reaches some angle values is fixed.Two sine waves above and below in figure
Picture, correspond to the voltage waveform of two points different in same power network.Assuming that the voltage-phase of different location, is reached any identical
The time that value is is t1 and t2 respectively, then according to the requirement of synchronized, T δ=t1-t2 value is fixed.As shown in Figure 1.
After the voltage phase angle of any one power supply point is measured to, it is same can uniquely to calculate other appointed place voltage-phases
Time difference.
This feature of distribution system is may be conveniently used in time calibration in network system to realize high-precision time service, had
Body method is summarised as：In time service server 1 and receive that voltage-phase detection means is installed respectively on time service device 4, measurement is each
By the voltage phase difference between time service device 4 and time service server 1, receive time service device 4 as initial value deposit；Time service service
Device 1 is using the high-precision time service modes such as the GPS/ Big Dippeves, the time precision of guarantee time service server 1；The timing of time service server 1 is to connecing
Time service broadcast is sent by time service device 4, the broadcast includes following parameter：Precise time corresponding to alternating voltage phase and the phase
Receive after time service device 4 receives the broadcast, to detect time value during corresponding voltage phase, calculate the time difference, realize timing function.
The utility model utilizes the principle that voltage and frequency must be synchronous in supply network, derives any in supply network
Time difference during 2 voltage-phases same values of arrival is fixed conclusion.In specific implementation process, used to reduce exploitation
Difficulty, based on NTP time calibration in network, increase voltage-phase condition on this basis and improve time service precision.Can also
Voluntarily it is related to network interaction, realizes easier time service mode.
The utility model is using ac voltage signal is directly used, and without antenna, securely and reliably, technology is concise, and equipment is easy
Safeguard that costly, application places do not limit application cost, the precision problem that can solve time calibration in network in installation operation.Time service
Precision can reach within 100 μ s, can almost meet all industrial time service requirements.
The utility model is described in further detail with reference to the accompanying drawings and examples.
Embodiment 1：As accompanying drawing 2 describes a kind of time dissemination system structure of the present utility model of simplified operation, including award
When end equipment and receive two parts of end equipment, wherein, time service end equipment connects time service terminal voltage phase by time service server 1 and examined
Survey device 3 to form, receive end equipment and connect receiving terminal voltage-phase detection means 5 by receiving time service device 4 to form；Time service end is set
It is standby and receive end equipment and connected by communication network 2.
In foregoing, every group of time service end equipment is at least connected with two groups and receives end equipment.
In foregoing, communication network 2 is realized using modes such as Ethernet, optical fiber, power carriers, preferential from achievable TCP/
The network type of IP agreement.
In the present embodiment, the time that voltage is zero from the negative zero crossing phase angle become a full member only is sent so that phase acquisition can lead to
Cross very simple system to realize, without processor and A/D chips.
In the present embodiment, to simplify systematic difference, voltage-phase detection, using zero-crossing examination device, recording voltage
At the time of phase angle is 0 degree.Time service precision calculates.The measurement accuracy of voltage-phase at present, highest can reach 0.03 degree, according to
50HZ frequency calculates, and the time can be as accurate as：
The μ s of 0.03/ (360*50) second=1.67*10-6 seconds=1.67.
In general power system device, phase angle measurement precision can reach within 1 degree, corresponding time service precision
For：
The 1/ μ s of (360*50)=55.56.
Because voltage is periodic sinusoidal ripple, identical phase can be repeated per 20ms, for the local network transport in region,
General transmission time can be less than 20ms, and many by the way of NTP time services, precision can reach 1~10ms, and periodic signal is not
Any influence can be produced on the time service method that the utility model uses.But if in Wide Area Network time service, network transmission is back and forth
The time difference is more than 20ms, in fact it could happen that the time service error of 20ms integral multiples.Network transmission imbalance have it is sudden, initial time service when
Wait, can repeatedly carry out time service operation, after time service result is stable time service terminate.It is inclined in clocking error after initial time service terminates
Move within 10ms time intervals, resend time service broadcast, ensure time service precision, be not in error.
In foregoing, time service server 1 is the precision clock source of whole region, receives the precision time service of the GPS/ Big Dippeves, clock
Precision is maintained within μ s levels, and the server is configured to ntp server.Wherein, Network Time Protocol has in RFC 5905 retouches in detail
State, windows servers are default to embed the agreement.
In foregoing, zero-crossing examination device is connected on 220V/380V or special voltage transformer pt, receives A/B/
A phase signals in C three-phase voltages, when voltage-phase is 0 degree, to server or receives time service device and send pulse.
In foregoing, it is to treat time service device to receive time service device 4, after time service, reaches the time precision within Millisecond.Receive
The server of time service device 4 is configured to NTP Client, and Network Time Protocol time service is realized with time service server 1.
In foregoing, communication network 2 runs ICP/IP protocol interface, using Ethernet, optical fiber solutions network consisting.Communication network
Network 2 has diversified forms mode.
In foregoing, time service server 1 is configured to NTP time service servers, if using windows servers, only needs letter
Single configuration, without installing any software.The GP configuring S/ Big Dipper time service devices of time service server 1, keep the essence of itself clock
Exactness.
In when the utility model embodiment works, the time service method course of work includes：
After system is installed and initialized, time service service can be started.During time service, time service services in two kinds of situation：
Initial time service and clock are kept；Wherein, initial time service is the first time time service after system startup or time step-out.
1) in initial time service, after receiving the startup of time service device 4, clock may have very big error with the real time, adopt
Initial time service is realized with the following methods：
A) NTP time service modes, the initial time service to achieve a butt joint by time service device 4 are started.After the completion of this process, because network prolongs
When and transmit unbalanced factor, clocking error may be at 1~10 millisecond or so, and this is the essence that can reach in a local network
Degree, in Wide Area Network time service, error is likely to be breached hundreds of to thousand of milliseconds, it is necessary to NTP is performed a plurality of times, and reduces time error.
B) NTP time services start, and start the monitoring of voltage phase angle zero angle, record each voltage phase angle zero angle started since then
Precise moments.
C) time service server 1 chooses one group of voltage zero angle moment, is sent to client.
D) after the voltage zero angle moment that client receives time service server 1, time service is compensated according to phase angle difference initial value
The time point that server 1 is sent, compared with the voltage over zero locally monitored；Local voltage over zero moment and time service service
The difference at the voltage over zero moment of device 1, as local clock error.
2) kept for the stage in clock, when receiving, the clock of time service device 4 is synchronized, and after keeping certain precision, without again
Secondary startup Network Time Protocol time service, only needs periodically calibration accuracy.It is less than 10ms to receive the cheap value of the clock of time service device 4
Determine the time service cycle.
A) periodicity of time service server 1 broadcasts time service instruction to all time service devices 4 that receive, while starts zero crossing prison
Survey, it is 0 degree of moment to record all voltage-phases started since then.
B) receive after time service device 4 receives the moment, to start zero crossing monitoring, recording voltage phase is 0 degree of moment.
C) time service server 1 receives time service device broadcast 0 degree of moment of one group of voltage phase angle to all.
3) receive after time service device 4 receives the moment group, compared with the voltage phase angle zero degree moment oneself monitored, to entangle
Positive local clock.
Time service precision is brought up to 1 millisecond by the utility model by the use of the voltage phase angle in electric power networks as subsidiary conditions
Within；Voltage to be measured includes fundamental voltage, residual voltage, harmonic voltage in power network, or various Injection Signal voltages, take with
A kind of voltage in upper various voltages takes wherein several voltages, compares this several voltage phase angle relation to improve as reference value
Time service precision；Wherein, voltage can directly be derived from 220/380V Alternating Current Power Supply networks, or be derived from various mesohigh electric power system voltages
The secondary side voltage of transformer, the voltage phase angle being introduced into ac power supply system, as simultaneous events, modifying factor network delay and
Time service error caused by network transmission imbalance.
The utility model respectively time service server 1 and receive 0 degree of test voltage phase angle on time service device 4 it is accurate when
Carve, calculate time difference T δ when each receives 0 degree of phase angle between time service device 4 and time service server 1, be i.e. voltage phase angle is 0
The time difference of degree, as correction value, input receives time service device.
The utility model can be used in large factories and mines enterprises and enterprises and institutions, such as：Power plant, power system, school, IT enterprises
Industry, finance, petrochemical industry, government bodies, national defence, broadcasting and TV, communication, traffic, medical treatment, water conservancy, metallurgy, security protection etc., it can also be used to long distance
From time service.
Claims (5)
1. the high-accuracy network time service equipment based on alternating supply voltage phase difference correction, it is characterised in that set including time service end
It is standby and receive two parts of end equipment, wherein, time service end equipment connects time service terminal voltage sensing by time service server (1) and filled
(3) composition is put, receives end equipment and is formed by receiving time service device (4) connection receiving terminal voltage-phase detection means (5)；Time service end
Equipment passes through communication network (2) connection with end equipment is received.
2. the high-accuracy network time service equipment based on alternating supply voltage phase difference correction as claimed in claim 1, its feature
It is, every group of time service end equipment is at least connected with two groups and receives end equipment.
3. the high-accuracy network time service equipment based on alternating supply voltage phase difference correction as claimed in claim 1, its feature
It is, time service end equipment sends the time that voltage is zero from the negative zero crossing phase angle become a full member to end equipment is received.
4. the high-accuracy network time service equipment based on alternating supply voltage phase difference correction as claimed in claim 1, its feature
It is, time service server (1) is configured to ntp server.
5. the high-accuracy network time service equipment based on alternating supply voltage phase difference correction as claimed in claim 1, its feature
It is, time service terminal voltage sensing device 3 is zero-crossing examination device, is connected to 220V/380V or special voltage is mutual
On sensor PT, receive the phase signals in A/B/C three-phase voltages, pulse is sent when voltage-phase is 0 degree.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109412692A (en) * | 2018-10-30 | 2019-03-01 | 中国科学院国家授时中心 | A kind of distribution type fiber-optic time dissemination system and its sagnac effect compensation method |
| CN112600638A (en) * | 2020-12-15 | 2021-04-02 | 国网北京市电力公司 | Power grid clock synchronization method and device |
-
2017
- 2017-06-09 CN CN201720668243.1U patent/CN206878834U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412692A (en) * | 2018-10-30 | 2019-03-01 | 中国科学院国家授时中心 | A kind of distribution type fiber-optic time dissemination system and its sagnac effect compensation method |
| CN109412692B (en) * | 2018-10-30 | 2021-05-18 | 中国科学院国家授时中心 | Distributed optical fiber time service system and sagnac effect compensation method thereof |
| 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 |
| CN112600638A (en) * | 2020-12-15 | 2021-04-02 | 国网北京市电力公司 | Power grid clock synchronization method and device |
| CN112600638B (en) * | 2020-12-15 | 2023-07-14 | 国网北京市电力公司 | Power grid clock synchronization method and device |
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