CN112272360A - Current differential protection data synchronization method and system based on 5G network time synchronization - Google Patents
Current differential protection data synchronization method and system based on 5G network time synchronization Download PDFInfo
- Publication number
- CN112272360A CN112272360A CN202011115299.7A CN202011115299A CN112272360A CN 112272360 A CN112272360 A CN 112272360A CN 202011115299 A CN202011115299 A CN 202011115299A CN 112272360 A CN112272360 A CN 112272360A
- Authority
- CN
- China
- Prior art keywords
- module
- time
- broadcast message
- differential protection
- current differential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
Abstract
The invention discloses a current differential protection data synchronization method and a system based on 5G network time synchronization, wherein the method comprises the following steps: a 5G module of the current differential protection device receives a broadcast message SIB9 of a 5G base station and a timing advance; calculating the propagation delay tau of the broadcast message according to the state of the broadcast message and the timing advance; modifying the local clock of the current differential protection device based on the broadcast message SIB9 and the propagation delay tau; and taking the corrected local clock as a reference, and providing time information and an absolute time tag required by synchronous sampling of current differential protection data for the current differential protection device by the 5G module. The invention designs a technical scheme for realizing time synchronization by utilizing a 5G module to receive time correlation quantity from a base station, and the scheme realizes the time service function of the base station to the 5G module by compensating propagation delay; and on the basis, a synchronous sampling time tick signal is provided for the current differential protection device, so that the synchronization of sampling data is realized.
Description
Technical Field
The invention relates to a current differential protection data synchronization method and system based on 5G network time synchronization, and belongs to the technical field of relay protection of power systems.
Background
The emergence and rapid development of the 5G communication technology provide an economic and reliable communication means for the power grid. Meanwhile, the 5G network communication process contains time information, and 300ns time synchronization error can be realized between 5G base stations at present. The method can be used as a value-added service to provide time service function for other industries.
The synchronous sampling of the current differential protection data means that two sides of a line are guaranteed to be sampled at the same time. At present, there are two main types of current differential protection data synchronization methods, one is a ping-pong synchronization method based on a data channel, and the other is a synchronization method based on satellite time service. The former is based on the consistent time delay of the channel back and forth path, calculates the path transmission time delay and the clock deviation of two sides, and adjusts the sampling data of two sides or the clocks of two sides to complete the data synchronization process. The method has strict requirements on channel delay jitter, data interaction is generally carried out by adopting optical fibers, and data synchronization cannot be realized through the method due to inconsistent round-trip routing delay in 5G communication. The synchronization method based on satellite time service depends on GPS/Beidou time service signals, and the current values on two sides are synchronously sampled by using pulse per second (1PPS) signals and serial port time information output by a satellite receiving module. This method requires each differential protection device to be equipped with a satellite receiving module, which greatly increases the economic cost; on the other hand, satellite signals are susceptible to interference, affecting the reliability of synchronization.
Therefore, the conventional data synchronization method cannot be completely adapted to 5G communication current differential protection.
Disclosure of Invention
Aiming at the defects of the method, the invention provides a current differential protection data synchronization method and system based on 5G network time synchronization, which can provide high-precision time information for a differential protection device and reasonably utilize the high-precision time information to realize synchronous sampling of protection devices on two sides of a line.
The technical scheme adopted for solving the technical problems is as follows:
on one hand, the current differential protection data synchronization method based on 5G network time synchronization provided by the embodiment of the present invention includes the following steps:
a 5G module of the current differential protection device receives a broadcast message SIB9 of a 5G base station and a timing advance;
calculating the propagation delay tau of the broadcast message according to the state of the broadcast message and the timing advance;
modifying the local clock of the current differential protection device based on the broadcast message SIB9 and the propagation delay tau;
and taking the corrected local clock as a reference, and providing time information and an absolute time tag required by synchronous sampling of current differential protection data for the current differential protection device by the 5G module.
The SIB is a 5G NR system information block through which the 5G module can acquire basic information on the base station side, for example, the SIB9 contains information related to GPS time and coordinated universal time. The system message block can be acquired at the 5G module through periodic broadcast or user side request. The TA value is a propagation delay estimation performed by the 5G communication to ensure that signals located in the same subframe but in different frequency domain resources can reach the base station at the same time, and is a necessary condition for ensuring that the 5G communication itself does not generate interference. The base station determines the distance between the uplink signal and the position of the base station through detection, acquires a TA value, and feeds the TA value back to the 5G module through downlink information. The invention designs the time service mode from the base station to the 5G module by utilizing the two time correlation quantities.
As a possible implementation manner of this embodiment, calculating the propagation delay τ of the broadcast message according to the state of the broadcast message and the timing advance includes:
judging the state of the module, and when the 5G module is initialized, the calculation formula of the propagation delay is as follows:
τ1＝(TA×Tμ)/2
when the 5G module is in a connection state, the propagation delay calculation formula is as follows:
τ2＝[NTA,old+(TA-31)×Tμ]/2
in the formula, TA is timing advance, and when the 5G module is in an initialized state, the TA index value is 0-3846; in the 5G module connection state, the TA index value is 0-63. T isμGranularity of timing advance TA, Tμ＝16*64*TC/2μ，TCIs the minimum time unit of 5G NR,. mu.0, 1,2 …, NTA,oldAnd the actual adjustment value of the timing advance TA of the 5G module in the previous time.
As a possible implementation manner of this embodiment, modifying the local clock of the current differential protection device based on the broadcast message SIB9 and the propagation delay τ includes:
the 5G module parses the time information t in the broadcast message SIB91And marks the time t of the reception of the broadcast message SIB92Wherein, t1Base station side time t when the base station side sends the broadcast message SIB92The time of the 5G module side when the 5G module side receives the broadcast message SIB 9;
calculating the clock deviation between the base station side and the local clock;
and correcting the local clock according to the deviation between the base station side and the local clock.
The GPS time and the coordinated universal time in the broadcast message SIB9 record the time information t of the base station sending SIB9 broadcast message1The clock on the base station side is used as the standard.
As a possible implementation manner of this embodiment, a calculation formula of the clock deviation Δ t between the base station side and the local clock is as follows:
Δt＝t1-t2-τ
wherein, tau is the propagation delay of the broadcast message, including the propagation delay tau1Or propagation delay tau2。
On the other hand, the current differential protection data synchronization system based on 5G network time synchronization provided by the embodiment of the invention comprises a 5G module, a clock module, a synchronous sampling control module, a data acquisition module and a CPU processor;
the 5G module acquires and decodes a broadcast message SIB9 and a timing advance TA from a 5G base station and marks a time stamp t on the receiving time of the broadcast message SIB92；
The 5G module simultaneously performs data interaction with the opposite end of the line;
the clock module is used for correcting the local clock based on the time correlation quantity analyzed by the 5G module and outputting a time tick signal;
the synchronous sampling control module is used for receiving the high-precision time information of the clock module and outputting sampling pulses meeting requirements;
the data acquisition module is used for converting the acquired current differential protection data analog quantity into a corresponding digital quantity;
and the CPU processor sets absolute time labels for the data packets, analyzes and processes the local data and the end data, and performs relay protection measurement, logic and control.
As a possible implementation manner of this embodiment, the clock module includes a local clock, a data storage unit, a time synchronization unit, and an output unit; the data storage unit stores the time correlation quantity analyzed by the 5G module; the time synchronization unit calculates the propagation delay tau of the broadcast message according to the time advance TA and calculates the clock difference between the base station side and the 5G module, the clock module corrects the local clock according to the clock difference, and the output unit outputs the time setting signal.
As a possible implementation manner of this embodiment, the calculation formula of the time deviation Δ t is:
Δt＝t1-t2-τ
in the formula, t1Base station side time t when the base station side sends the broadcast message SIB92τ is the propagation delay of the broadcast message, which is the 5G module side time when the 5G module side receives the broadcast message SIB 9.
As a possible implementation manner of this embodiment, the propagation delay of the broadcast message includes:
when the 5G module is initialized, the propagation delay is:
τ1＝(TA×Tμ)/2
when the 5G module is in the connected state, the propagation delay is:
τ2＝[NTA,old+(TA-31)×Tμ]/2
in the formula, TA is timing advance, and when the 5G module is in an initialized state, the TA index value is 0-3846; in the 5G module connection state, the TA index value is 0-63. T isμGranularity of timing advance TA, Tμ＝16*64*TC/2μ，TCIs the minimum time unit of 5G NR,. mu.0, 1,2 …, NTA,oldAnd the actual adjustment value of the timing advance TA of the 5G module in the previous time.
As a possible implementation manner of this embodiment, the clock module supports an external input time synchronization manner.
The technical scheme of the embodiment of the invention has the following beneficial effects:
the invention utilizes the 5G module to receive the time correlation quantity from the base station; designing a technical scheme for realizing time synchronization by using time correlation quantity, wherein the scheme realizes the time service function of the base station to the 5G module by compensating propagation delay; and on the basis, a synchronous sampling time tick signal is provided for the current differential protection device, so that the synchronization of sampling data is realized.
The 5G network is used as a current differential protection data interaction channel, and meanwhile, high-precision time information contained in the 5G network provides a time reference for synchronization of differential protection data. Compared with the traditional ping-pong algorithm and the satellite time service method, the method does not need to lay an optical fiber line or install a satellite receiving module, is convenient to use and has lower cost.
The invention utilizes the time signal of 5G network communication: a specific 5G wireless time service mode is designed by a system message block SIB9 and a time advance TA, and the method does not need extra signaling overhead at a base station side and is simple to implement.
Description of the drawings:
FIG. 1 is a flow diagram illustrating a method for current differential protection data synchronization over 5G network pairs in accordance with an exemplary embodiment;
FIG. 2 is a schematic diagram illustrating a 5G network time flow according to an example embodiment;
FIG. 3 is a schematic diagram illustrating a 5G module acquiring time signals in accordance with an exemplary embodiment;
FIG. 4 is a flow chart illustrating a 5G module pairing procedure in accordance with an exemplary embodiment;
FIG. 5 is a logical block diagram illustrating a 5G module time pairing in accordance with an exemplary embodiment;
FIG. 6 is a schematic diagram illustrating a 5G module providing time information to a protection device in accordance with an exemplary embodiment;
FIG. 7 is a schematic diagram illustrating an internal structure of a current differential protection data synchronization system based on 5G network time service according to an exemplary embodiment;
fig. 8 is an overall schematic diagram of a 5G network time service current differential protection data synchronization system according to an exemplary embodiment.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
in order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
The current differential protection in the power grid has extremely high requirements on time synchronization, and when the 5G network realizes data interaction on two sides of a line, the time service function of the 5G network can also provide an optional idea for solving the data synchronization problem of the scene, so that the problem can be perfectly solved by the high-precision time information of the 5G network.
The synchronization is realized by two steps: (1) high-precision time synchronization is realized among the 5G base stations; (2) and the equipment on the two sides of the line is independently timed by the base stations in the coverage areas of the equipment. Through the two steps, the equipment on two sides of the line can obtain high-precision time synchronization. To meet the requirements of the communication service itself, step (1) has been implemented. The invention provides a specific implementation method for the time service function of a base station to terminal equipment, which fully utilizes the existing time related information in a 5G network to compensate transmission time delay, provides high-precision time information for a differential protection device on the basis of the transmission time delay, and reasonably utilizes the high-precision time information to realize synchronous sampling of protection devices at two sides of a line.
Fig. 1 is a flow chart illustrating a method for current differential protection data synchronization based on 5G network time-pairing according to an exemplary embodiment. As shown in fig. 1, a method for synchronizing current differential protection data based on a 5G network time synchronization provided in an embodiment of the present invention is provided, where the 5G network implements base station synchronization through high-precision time synchronization networking. The flow of time information is shown in fig. 2, the invention provides a specific implementation method for the time service function of a base station to a terminal device, and the synchronous sampling of the protection devices on two sides of a line is implemented by using the high-precision time information, which comprises the following steps:
in step S1, the 5G module of the current differential protection device receives the broadcast message SIB9 of the 5G base station and the timing advance.
Process for acquiring base station side time signal (system message block SIB9 and timing advance TA) as shown in fig. 3, the 5G module receives system message block SIB9 containing information related to GPS time and coordinated universal time by periodic broadcast. The base station determines the distance between the uplink signal and the position of the base station through power detection, obtains a TA value, and feeds the TA value back to the 5G module through downlink information.
Step S2, calculating the propagation delay tau of the broadcast message according to the state of the broadcast message and the timing advance;
step S3, correcting the local clock of the current differential protection device based on the broadcast message SIB9 and the propagation delay tau;
and step S4, taking the corrected local clock as a reference, and providing time information and an absolute time tag required by synchronous sampling of current differential protection data for the current differential protection device by the 5G module.
The corrected local clock is used as a reference, the 5G module outputs IBIG-B code and other time-setting signals to provide time information required by synchronous sampling for the protection device; and the data packet is tagged with an absolute time tag. The specific procedure of step S4 is shown in fig. 6.
As a possible implementation manner of this embodiment, calculating the propagation delay τ of the broadcast message according to the state of the broadcast message and the timing advance includes:
firstly, detecting the 5G signal intensity, and judging whether the time service requirement is met;
and judging the state of the base station, when the 5G module is initialized, determining a TA value by measuring the received Preamble by the base station, and sending the 5G module through a TA Command field (total 12 bits, and the corresponding TA index value is 0-3846). When the subcarrier spacing is 2μTime at 15KHz (μ ═ 0,1,2 …)TA granularity of Tμ＝16*64*TC/2μ，TCThe minimum time unit of 5G NR is 0.5086ns, TA x T for random accessμIs the actual adjustment value. As can be seen from the definition of TA, the TA is substantially twice the propagation delay, so the equation for calculating the propagation delay from the base station to the 5G module is:
τ1＝(TA×Tμ)/2
when the 5G module is in a connection state, considering factors such as mobility and crystal oscillator offset of the 5G module, the TA still needs to be updated, the base station determines the offset of the TA at the moment by measuring the uplink transmission signal, the offset TA is sent to the 5G module through a TA Command field (total 6 bits, corresponding TA index value is 0-63), and the 5G module stores the actual adjustment value N of the TA of the previous timeTA,oldAfter receiving the new offset TA value, a new actual adjustment value is calculated: n is a radical ofTA,new＝NTA,old+(TA-31)*Tμ. From this, the propagation delay calculation formula in this case is:
τ2＝[NTA,old+(TA-31)×Tμ]/2
wherein TA is the timing advance Tμ＝16*64*TC/2μ，TCIs the minimum time unit of 5G NR,. mu.0, 1,2 …, NTA,oldAnd the actual adjustment value of the timing advance TA of the 5G module in the previous time.
As a possible implementation manner of this embodiment, modifying the local clock of the current differential protection device based on the broadcast message SIB9 and the propagation delay τ includes:
the 5G module parses the time information t in the broadcast message SIB91The time t of receiving the broadcast message SIB9 is marked based on the base station side clock2Wherein, t1Base station side time t when the base station side sends the broadcast message SIB92The time of the 5G module side when the 5G module side receives the broadcast message SIB 9;
calculating the clock deviation between the base station side and the local clock; 5G Module according to t1、t2Calculating clock deviation with propagation delay tau, and correcting local clock at intervalsThe inter-deviation Δ t is calculated as:
Δt＝t1-t2-τ
wherein, tau is the propagation delay of the broadcast message, including the propagation delay tau1Or propagation delay tau2。
And correcting the local clock according to the deviation between the base station side and the local clock. The implementation of the correction of the local clock is shown in fig. 4.
And the 5G module calculates the time deviation according to the analyzed time correlation quantity and corrects the local clock. This step can be implemented by setting a threshold value T for the clock skew0Comparing the clock offset with T0Fig. 5 shows a logic flow chart of the time service function of the base station to the terminal device.
As shown in fig. 7, the current differential protection data synchronization system based on 5G network time synchronization according to the embodiment of the present invention includes a 5G module, a clock module, a synchronous sampling control module, a data acquisition module, and a CPU processor;
the 5G module acquires and decodes a broadcast message SIB9 and a timing advance TA from a 5G base station and marks a time stamp t on the receiving time of the broadcast message SIB92(ii) a Wherein, the GPS time and the coordinated universal time in the SIB9 record the time t when the base station transmits SIB9 broadcast message1The clock on the base station side is used as the standard.
The 5G module simultaneously performs data interaction with the opposite end of the line;
the clock module is used for correcting the local clock based on the time correlation quantity analyzed by the 5G module and outputting a time tick signal;
the synchronous sampling control module is used for receiving the high-precision time information of the clock module and outputting sampling pulses meeting requirements;
the data acquisition module is used for converting the acquired current differential protection data analog quantity into a corresponding digital quantity;
and the CPU processor sets absolute time labels for the data packets, analyzes and processes the local data and the end data, and performs relay protection measurement, logic and control.
As a possible implementation manner of this embodiment, the clock module includes a local clock, a data storage unit, a time synchronization unit, and an output unit; the data storage unit stores the time correlation quantity analyzed by the 5G module; the time synchronization unit calculates the propagation delay tau of the broadcast message according to the time advance TA and calculates the clock difference between the base station side and the 5G module, the clock module corrects the local clock according to the clock difference, and the output unit outputs a time setting signal: IRIG-B code, timing pulse, serial port time information and the like.
In this embodiment, the clock module outputs a B-code time tick signal, and after decoding, the clock module provides a pulse per second (1PPS) for the synchronous sampling control module, and the synchronous sampling control module outputs a synchronous sampling pulse.
As a possible implementation manner of this embodiment, the calculation formula of the time deviation Δ t is:
Δt＝t1-t2-τ
in the formula, t1Base station side time t when the base station side sends the broadcast message SIB92τ is the propagation delay of the broadcast message, which is the 5G module side time when the 5G module side receives the broadcast message SIB 9.
As a possible implementation manner of this embodiment, the propagation delay of the broadcast message includes:
when the 5G module is initialized, the propagation delay is:
τ1＝(TA×Tμ)/2
when the 5G module is in the connected state, the propagation delay is:
τ2＝[NTA,old+(TA-31)×Tμ]/2
in the formula, TA is timing advance, and when the 5G module is in an initialized state, the TA index value is 0-3846; in the 5G module connection state, the TA index value is 0-63. T isμGranularity of timing advance TA, Tμ＝16*64*TC/2μ，TCIs the minimum time unit of 5G NR,. mu.0, 1,2 …, NTA,oldAnd the actual adjustment value of the timing advance TA of the 5G module in the previous time.
As a possible implementation manner of this embodiment, the clock module supports an external input time synchronization manner. The clock module can be used for accurately keeping time for a long time by depending on a local atomic clock, can still output high-precision time under the condition of 5G communication alarm, and supports an external input time setting mode for increasing redundant configuration.
Fig. 7 is a schematic diagram of the entire current differential protection data synchronization system based on 5G network timing in this embodiment.
The technical scheme provided by the invention can solve the problem that the existing data synchronization mode cannot adapt to 5G current differential protection, and has the characteristics of high precision, low cost and flexible deployment.
The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements are also considered to be within the scope of the present invention.
Claims (9)
1. A current differential protection data synchronization method based on 5G network time synchronization is characterized by comprising the following steps:
a 5G module of the current differential protection device receives a broadcast message SIB9 of a 5G base station and a timing advance;
calculating the propagation delay tau of the broadcast message according to the state of the broadcast message and the timing advance;
modifying the local clock of the current differential protection device based on the broadcast message SIB9 and the propagation delay tau;
and taking the corrected local clock as a reference, and providing time information and an absolute time tag required by synchronous sampling of current differential protection data for the current differential protection device by the 5G module.
2. The method for current differential protection data synchronization based on 5G network time pairing as claimed in claim 1, wherein the step of calculating the propagation delay τ of the broadcast message according to the state of the broadcast message and the timing advance comprises:
judging the state of the module, and when the 5G module is initialized, the calculation formula of the propagation delay is as follows:
τ1＝(TA×Tμ)/2
when the 5G module is in a connection state, the propagation delay calculation formula is as follows:
τ2＝[NTA,old+(TA-31)×Tμ]/2
in the formula, TA is timing advance, and when the 5G module is in an initialized state, the TA index value is 0-3846; when the 5G module is in a connection state, the TA index value is 0-63; t isμGranularity of timing advance TA, Tμ＝16*64*TC/2μ，TCIs the minimum time unit of 5G NR,. mu.0, 1,2 …, NTA,oldAnd the actual adjustment value of the timing advance TA of the 5G module in the previous time.
3. The method for synchronizing data of current differential protection based on 5G network pair according to claim 2, wherein the step of modifying the local clock of the current differential protection device based on the broadcast message SIB9 and the propagation delay τ comprises:
the 5G module parses the time information t in the broadcast message SIB91And marks the time t of the reception of the broadcast message SIB92Wherein, t1Base station side time t when the base station side sends the broadcast message SIB92The time of the 5G module side when the 5G module side receives the broadcast message SIB 9;
calculating the clock deviation between the base station side and the local clock;
and correcting the local clock according to the deviation between the base station side and the local clock.
4. The method for current differential protection data synchronization when based on a 5G network pair as claimed in claim 3, wherein the calculation formula of the clock deviation Δ t between the base station side and the local clock is:
Δt＝t1-t2-τ
wherein, tau is the propagation delay of the broadcast message, including the propagation delay tau1Or propagation delay tau2。
5. A current differential protection data synchronization system based on 5G network time synchronization is characterized by comprising a 5G module, a clock module, a synchronous sampling control module, a data acquisition module and a CPU (central processing unit) processor;
the 5G module acquires and decodes a broadcast message SIB9 and a timing advance TA from a 5G base station and marks a time stamp t on the receiving time of the broadcast message SIB92；
The 5G module simultaneously performs data interaction with the opposite end of the line;
the clock module is used for correcting the local clock based on the time correlation quantity analyzed by the 5G module and outputting a time tick signal;
the synchronous sampling control module is used for receiving the high-precision time information of the clock module and outputting sampling pulses meeting requirements;
the data acquisition module is used for converting the acquired current differential protection data analog quantity into a corresponding digital quantity;
and the CPU processor sets absolute time labels for the data packets, analyzes and processes the local data and the end data, and performs relay protection measurement, logic and control.
6. The current differential protection data synchronization system based on 5G network time pairing as claimed in claim 5, wherein the clock module comprises a local clock, a data storage unit, a time synchronization unit and an output unit; the data storage unit stores the time correlation quantity analyzed by the 5G module; the time synchronization unit calculates the propagation delay tau of the broadcast message according to the time advance TA and calculates the clock difference between the base station side and the 5G module, the clock module corrects the local clock according to the clock difference, and the output unit outputs the time setting signal.
7. The system according to claim 6, wherein the time deviation Δ t is calculated by the following formula:
Δt＝t1-t2-τ
in the formula，t1Base station side time t when the base station side sends the broadcast message SIB92τ is the propagation delay of the broadcast message, which is the 5G module side time when the 5G module side receives the broadcast message SIB 9.
8. The system according to claim 7, wherein the propagation delay of the broadcast message comprises:
when the 5G module is initialized, the propagation delay is:
τ1＝(TA×Tμ)/2
when the 5G module is in the connected state, the propagation delay is:
τ2＝[NTA,old+(TA-31)×Tμ]/2
wherein TA is the timing advance, TμIs the granularity of the timing advance TA, NTA,oldAnd the actual adjustment value of the timing advance TA of the 5G module in the previous time.
9. The system according to any of claims 5 to 8, wherein the clock module supports an external input time synchronization mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011115299.7A CN112272360B (en) | 2020-10-16 | 2020-10-16 | Current differential protection data synchronization method and system based on 5G network time synchronization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011115299.7A CN112272360B (en) | 2020-10-16 | 2020-10-16 | Current differential protection data synchronization method and system based on 5G network time synchronization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112272360A true CN112272360A (en) | 2021-01-26 |
| CN112272360B CN112272360B (en) | 2021-11-02 |
Family
ID=74338282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011115299.7A Active CN112272360B (en) | 2020-10-16 | 2020-10-16 | Current differential protection data synchronization method and system based on 5G network time synchronization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112272360B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406436A (en) * | 2021-06-17 | 2021-09-17 | 山东大学 | Traveling wave fault location method and system for alternating-current and direct-current transmission line based on 5G communication |
| CN115347964A (en) * | 2022-05-23 | 2022-11-15 | 苏州市福川科技有限公司 | Broadcasting station clock management system and method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105188128A (en) * | 2015-08-21 | 2015-12-23 | 北京北方烽火科技有限公司 | Wireless time service and air interface synchronization method, base station, communication device and system |
| CN105228240A (en) * | 2015-10-15 | 2016-01-06 | 北京北方烽火科技有限公司 | A kind of time synchronization method, equipment and base station |
| CN106488550A (en) * | 2016-12-20 | 2017-03-08 | 华为技术有限公司 | Determine the method and apparatus of terminal and base station clock time deviation |
| CN110838713A (en) * | 2019-11-26 | 2020-02-25 | 山东大学 | 5G network-based distributed differential protection method and system for power distribution network |
| CN111030066A (en) * | 2019-12-18 | 2020-04-17 | 南京国电南自电网自动化有限公司 | Line differential protection method based on switching of optical fiber channel and wireless channel |
| CN111478295A (en) * | 2020-04-01 | 2020-07-31 | 南京国电南自电网自动化有限公司 | Data synchronization method and system suitable for wireless line differential protection |
| CN111509679A (en) * | 2020-04-09 | 2020-08-07 | 陕西省地方电力(集团)有限公司延安供电分公司 | Cloud computing distribution network level difference protection system and method based on 5G |
-
2020
- 2020-10-16 CN CN202011115299.7A patent/CN112272360B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105188128A (en) * | 2015-08-21 | 2015-12-23 | 北京北方烽火科技有限公司 | Wireless time service and air interface synchronization method, base station, communication device and system |
| CN105228240A (en) * | 2015-10-15 | 2016-01-06 | 北京北方烽火科技有限公司 | A kind of time synchronization method, equipment and base station |
| CN106488550A (en) * | 2016-12-20 | 2017-03-08 | 华为技术有限公司 | Determine the method and apparatus of terminal and base station clock time deviation |
| CN110838713A (en) * | 2019-11-26 | 2020-02-25 | 山东大学 | 5G network-based distributed differential protection method and system for power distribution network |
| CN111030066A (en) * | 2019-12-18 | 2020-04-17 | 南京国电南自电网自动化有限公司 | Line differential protection method based on switching of optical fiber channel and wireless channel |
| CN111478295A (en) * | 2020-04-01 | 2020-07-31 | 南京国电南自电网自动化有限公司 | Data synchronization method and system suitable for wireless line differential protection |
| CN111509679A (en) * | 2020-04-09 | 2020-08-07 | 陕西省地方电力(集团)有限公司延安供电分公司 | Cloud computing distribution network level difference protection system and method based on 5G |
Non-Patent Citations (3)
| Title |
|---|
| JIAKAI HUANG，HOULEI GAO，LE ZHAO, AND YUYAO FENG: "Instantaneous Active Power Integral Differential Protection for Hybrid AC/DC Transmission Systems Based on Fault Variation Component", 《IEEE TRANSACTIONS ON POWER DELIVERY》 * |
| 吕玉祥杨阳董亚文汪玉成: "5G技术在配电网电流差动保护业务中的应用", 《电信科学》 * |
| 袁通，高厚磊，徐彬，李欣: "5G高精度时间同步及在电网中的应用模式研究", 《电力信息与通信技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406436A (en) * | 2021-06-17 | 2021-09-17 | 山东大学 | Traveling wave fault location method and system for alternating-current and direct-current transmission line based on 5G communication |
| CN115347964A (en) * | 2022-05-23 | 2022-11-15 | 苏州市福川科技有限公司 | Broadcasting station clock management system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112272360B (en) | 2021-11-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10813070B2 (en) | Method and apparatus for determining clock time deviation between terminal and base station | |
| US11115941B2 (en) | Wireless communication system, wireless terminal, and time synchronization method | |
| US6483856B1 (en) | GPS synchronized data communications link | |
| US8400965B2 (en) | Radio base station apparatus and synchronization method thereof | |
| KR960012481B1 (en) | Simulcast synchronization and equalization system and method thereof | |
| CN112272360B (en) | Current differential protection data synchronization method and system based on 5G network time synchronization | |
| CN113273261A (en) | Timing advance determination in wireless networks | |
| CN106656386A (en) | Local clock adjusting method, timing method and timing device | |
| CN110401504B (en) | Satellite communication system time synchronization method based on TDMA | |
| CN112616181B (en) | Current differential protection data synchronization method and system adaptive to 5G communication | |
| CN111711948B (en) | Method and system for acquiring high-precision time from 5G base station through air interface | |
| CN112532309B (en) | Physical layer transmission method and device suitable for simple satellite internet of things terminal | |
| US20080279173A1 (en) | Method to Synchronize Receiver's Clock to Transmitter's Clock at Sub-100Nsec | |
| WO2017071276A1 (en) | Relay systems air interface time synchronization method and device | |
| EP3010168B1 (en) | Frequency calibration method | |
| CN110149141A (en) | Signal transmission timing method based on UTC | |
| EP2312775A1 (en) | Physical time-stamping | |
| CN110518934B (en) | Synchronization method of optical transport network | |
| CN114258041A (en) | Clock source monitoring method and device and computer readable storage medium | |
| CN114979316B (en) | Ammeter time synchronization system and method based on power line carrier communication | |
| CN105281882A (en) | Method and device for realizing time synchronization | |
| KR100817015B1 (en) | Method and apparatus for tracking clock frequency in mb-ofdm system | |
| KR100901752B1 (en) | Synchronizing method in a radio access station and in a remote unit, radio access station, and remote unit for supporting the same | |
| CN102821457A (en) | Clock synchronizing method based on software defined radio and software defined radio system | |
| CN219780402U (en) | Ad hoc network system based on satellite time service |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |