CN116471211B - Accurate time setting method for electric power Internet of things - Google Patents
Accurate time setting method for electric power Internet of things Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
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- 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
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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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses an accurate time setting method of an electric power Internet of things, which comprises the following steps of: the master station issues a time setting instruction to a network root node, the network root node forms an accurate time setting message based on the time setting instruction, and issues the accurate time setting message to a network slave node; the network slave node calculates message transmission delay according to the accurate time alignment message; the network slave node updates the node time and the accurate time alignment message based on the accurate time alignment message and the message transmission delay, and sends the updated accurate time alignment message to the next-stage network slave node; repeating the steps until the network time synchronization of all nodes in the network is completed. The technical problems of accurately and rapidly accurately timing the electric power internet of things and avoiding network conflicts are solved.
Description
Technical Field
The invention relates to the technical field of communication of the Internet of things, in particular to a precise time setting method of an electric power Internet of things.
Background
With the continuous promotion of the construction of the electric power internet of things, the operation years of equipment in a platform area are continuously increased, and part of equipment is aged or damaged due to batteries, once a line power failure event occurs, a clock circuit cannot normally operate and calculate the time length under the power supply of the batteries, so that the clock deviation is caused because the terminal equipment after power recovery cannot normally initialize the clock, the equipment program fault can be triggered under serious conditions, various problems such as data freezing, table number acquisition stopping and running are caused, the accumulated electric quantity deviation caused by non-human reasons is formed, service disputes are extremely easy to occur, and the line loss management indexes in the same period of the platform area are negatively influenced.
Aiming at the time setting requirement of the electric power Internet of things, two schemes of whole network broadcasting time setting and point-to-point time setting are generally adopted at present. The whole network broadcasting time setting scheme adopts a network root node to broadcast time setting messages, after receiving the messages, a slave node in the network sets the calendar time of the equipment according to the calendar time carried in the messages, and forwards the unchanged broadcasting of the messages. The point-to-point time setting scheme adopts a root node roll call mode, a time setting channel is built with slave nodes one by one, after the slave nodes in the network receive the message, the calendar time of the equipment is set according to the calendar time in the message, and a confirmation frame is returned to the root node, so that the message is not required to be forwarded. Therefore, it is needed to provide a precise time setting method for the electric power internet of things, which solves the technical problems of accurately and rapidly accurately setting the electric power internet of things and avoiding network conflicts.
Disclosure of Invention
The invention mainly aims to provide a precise time setting method for an electric power Internet of things, which aims to solve the technical problems of accurately and rapidly accurately setting the electric power Internet of things and avoiding network conflicts.
In order to achieve the above object, the present invention provides a precise time synchronization method for an electric power internet of things, wherein the precise time synchronization method for the electric power internet of things comprises the following steps:
s1, a master station issues a time synchronization instruction to a network root node, the network root node forms an accurate time synchronization message based on the time synchronization instruction, and the accurate time synchronization message is issued to a network slave node;
s2, the network slave node calculates message transmission delay according to the accurate time alignment message;
s3, the network slave node updates the node time and the accurate time alignment message based on the accurate time alignment message and the message transmission delay, and sends the updated accurate time alignment message to the next-stage network slave node;
s4, repeating the steps S2-S3 until the network time synchronization of all nodes in the network is completed.
In one preferred scheme, the accurate time alignment message comprises local calendar time, a network clock count value and a finite field identifier.
According to one of the preferred schemes, the network root node adopts a finite field broadcasting mode to periodically send the accurate time alignment message to the network slave node.
According to one of the preferred schemes, the network slave node adopts a finite field broadcasting mode to periodically send the accurate time alignment message to the next-stage network slave node.
In one preferred scheme, the step S2 of calculating the message transmission delay by the network slave node according to the accurate time alignment message specifically includes:
the network receives and analyzes the accurate time alignment message from the node;
judging the sizes of the network levels and the finite field identifiers in the accurate alignment message;
if the network hierarchy of the network slave node is the same as or equal to the finite field identifier in the accurate time alignment message plus 1, the network slave node calculates the message transmission delay and sets the forwarding flag of the message to 1; otherwise, discarding the accurate time alignment message.
One of the preferred schemes, the calculating the message transmission delay specifically includes:
when a network slave node receives a precise time alignment message of a network root node or a previous-level network slave node for the first time, the network slave node executes local clock count following operation according to the precise time alignment message;
when the network slave node does not receive the accurate time alignment message of the network root node or the upper-level network slave node for the first time, the network slave node executes the local clock counting synchronization operation according to the accurate time alignment message and calculates the message transmission delay.
According to one of the preferred schemes, the network slave node executes local clock count following operation according to the accurate time alignment message, specifically:
；
wherein ,the method comprises the steps that (1) a network clock count value carried in an ith accurate time setting message sent by a network root node or a slave node of a previous-level network is +.>Counting an initial value for a network clock of a current network slave node, < >>Every +.>Automatically counting by a timer.
According to one of the preferred schemes, the network slave node executes the local clock counting synchronization operation according to the accurate time alignment message and calculates the message transmission delay, specifically:
calculating the difference value of network clock count values in the accurate time alignment messages sent from the adjacent front and back of the network root node or the upper-level network slave node; calculating the difference value of the local clock count value of the network when the network receives the accurate time alignment message from the front and back of the adjacent nodes;
calculating the frequency deviation of the local clock count value and the network clock count value based on the difference value of the network clock count value and the difference value of the local clock count value;
and calculating the message transmission delay according to the frequency deviation.
In one preferred embodiment, the updating the node time in step S3 specifically includes:
calculating a local calendar time difference value of a slave node of the current network;
；
wherein ,for the local calendar time difference,/>For message transmission delay->A time interval for the timer to count automatically;
calculating and updating the local calendar time in the accurate time alignment message;
；
wherein ,for updated local calendar time, +.>The local calendar time carried in the accurate time alignment message is sent by the network root node or the slave node of the upper-level network.
In one preferred embodiment, the updating of the accurate time alignment message in step S3 specifically includes:
the network slave node respectively replaces the updated local calendar time and network clock count value in the accurate time alignment message, and updates the network hierarchy of the network slave node to the finite field identification in the accurate time alignment message.
In the technical scheme, the accurate time setting method of the electric power internet of things comprises the following steps of: the master station issues a time setting instruction to a network root node, the network root node forms an accurate time setting message based on the time setting instruction, and issues the accurate time setting message to a network slave node; the network slave node calculates message transmission delay according to the accurate time alignment message; the network slave node updates the node time and the accurate time alignment message based on the accurate time alignment message and the message transmission delay, and sends the updated accurate time alignment message to the next-stage network slave node; repeating the steps until the network time synchronization of all nodes in the network is completed. The invention solves the technical problems of accurately and rapidly accurately timing the electric power internet of things and avoiding network conflict.
According to the invention, the precision of the accurate time synchronization of the electric power Internet of things is greatly improved by tracking and synchronizing the network clock count value and compensating the time delay of the accurate time synchronization message in network transmission.
In the invention, the accurate time alignment message is issued to the next-stage network slave node by adopting a finite field broadcasting mode, so that the network load of the accurate time alignment message is effectively reduced, the network storm problem caused by whole network broadcasting under a large-scale network is avoided, and the communication success rate is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings may be obtained from the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a first schematic diagram of a precise time synchronization method of an electric power internet of things according to an embodiment of the invention;
fig. 2 is a second schematic diagram of a precise time synchronization method of an electric power internet of things according to an embodiment of the invention;
FIG. 3 is a flow chart of step S2 according to the embodiment of the present invention;
fig. 4 is a schematic diagram showing comparison of time synchronization success rate between time synchronization by using whole network broadcasting and the time synchronization method according to the embodiment of the present invention.
The achievement of the object, functional features and advantages of the present invention will be further described with reference to the drawings in connection with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as upper and lower … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
Moreover, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the embodiments, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the combination of the technical solutions does not exist, and is not within the scope of protection claimed by the present invention.
Referring to fig. 1-3, according to an aspect of the present invention, the present invention provides an accurate time synchronization method for an electric power internet of things, wherein the accurate time synchronization method for the electric power internet of things includes the following steps:
s1, a master station issues a time synchronization instruction to a network root node, the network root node forms an accurate time synchronization message based on the time synchronization instruction, and the accurate time synchronization message is issued to a network slave node;
s2, the network slave node calculates message transmission delay according to the accurate time alignment message;
s3, the network slave node updates the node time and the accurate time alignment message based on the accurate time alignment message and the message transmission delay, and sends the updated accurate time alignment message to the next-stage network slave node;
s4, repeating the steps S2-S3 until the network time synchronization of all nodes in the network is completed.
Specifically, in this embodiment, the master station issues a timing fingerThe method comprises the steps that when the network root node is reached, after receiving a time setting instruction of a master station, the network root node reads local calendar timeAnd the network clock count value NTB of the network clock counter is used for forming an accurate time alignment message, wherein the accurate time alignment message comprises local calendar time, the network clock count value and a finite field identifier, the network clock count value is automatically counted by a 32-bit timer, and each interval is>1 is automatically added, the invention is not particularly limited, and the invention can be particularly set according to the needs; the network root node periodically transmits the accurate time alignment message to the network slave node in a finite field broadcasting mode, the finite field identifier is 0 for the network root node, and the finite field identifier is the network level of the network slave node.
Specifically, in this embodiment, the step S2 of calculating, by the network slave node, a message transmission delay according to the accurate time alignment message specifically includes:
the network receives and analyzes the accurate time alignment message from the node;
judging the sizes of the network levels and the finite field identifiers in the accurate alignment message;
if the network hierarchy of the network slave node is the same as or equal to the finite field identifier in the accurate time alignment message plus 1, the network slave node calculates the message transmission delay and sets the forwarding flag of the message to 1; otherwise, discarding the accurate time alignment message without any processing; for example, after the network slave node receives the accurate time alignment message, the accurate time alignment message is analyzed to obtain the finite field identifier of the accurate time alignment message as 0, if the network level of the network slave node is 1, the network slave node needs to calculate the transmission delay of the accurate time alignment message, and forwards the message to the next-stage network slave node, and if the network level of the network slave node is 2, the network slave node discards the message and does not perform subsequent processing.
Specifically, in this embodiment, the calculating the packet transmission delay is specifically:
when a network slave node receives a precise time alignment message of a network root node or a previous-level network slave node for the first time, the network slave node executes local clock count following operation according to the precise time alignment message; the method comprises the following steps:
；
wherein ,the method comprises the steps that (1) a network clock count value carried in an ith accurate time setting message sent by a network root node or a slave node of a previous-level network is +.>Counting an initial value for a network clock of a current network slave node, < >>Every +.>Automatically counting by a timer; for example, after the network receives the first accurate time alignment message from the node, the accurate time alignment message is parsed to obtain the network clock count value +.>100, the value is recorded and the own local clock counter is added ∈>Is adjusted to a value of 100;
when a network slave node does not receive the accurate time alignment message of a network root node or a previous-level network slave node for the first time, the network slave node executes local clock counting synchronization operation according to the accurate time alignment message and calculates message transmission delay; the method comprises the following steps:
calculating a difference value of network clock count values in the accurate time alignment messages sent from the adjacent front and back of the network root node or the upper-level network slave node, wherein the difference value is specifically as follows:
；
wherein ,the difference value of the network clock count values in the accurate time alignment messages sent back and forth adjacently to the network root node or the slave node of the upper-level network is +.>The network clock count value carried in the (i+1) th accurate time synchronization message is sent by a network root node or a slave node of the upper-level network;
when the network receives accurate time alignment messages from the front and back of adjacent nodes, the difference value of the local clock count values is calculated, and the method specifically comprises the following steps:
；
wherein ,when the network receives the accurate time alignment messages sent from the nodes, the difference value of the self local clock count value is +.>When the network slave node receives the (i+1) th accurate time alignment message, the network slave node self-local clock count value;
calculating the frequency deviation between the local clock count value and the network clock count value based on the difference between the network clock count value and the local clock count value, specifically:
；
wherein ,is the frequency deviation;
according to the frequency deviation, calculating message transmission delay, specifically:
wherein ,delay for message transmission;
the method comprises the steps of updating the network clock count initial value and the local clock count initial value of the current network slave node, wherein the initial value is specifically as follows:
；
for example, after the network receives the second accurate time alignment message from the node, the accurate time alignment message is parsed to obtain the network clock count value carried in the accurate time alignment message200, at the same time, local clock count value +.>180, recorded according to the above procedure +.> and />Is calculated to obtain:
；
completion of the message transmission delayAfter the calculation of (a), the network slave node counts the network clock count value in the accurate time synchronization message +.>Record and count the local clock count +.>Updated to the network node count valueTo make the next time tick calculation.
Specifically, in this embodiment, the updating the node time in step S3 specifically includes:
calculating a local calendar time difference value of a slave node of the current network;
；
wherein ,for the local calendar time difference,/>For message transmission delay->A time interval for the timer to count automatically;
calculating and updating the local calendar time in the accurate time alignment message;
；
wherein ,for updated local calendar time, +.>The method comprises the steps that local calendar time carried in an accurate time alignment message is sent by a network root node or a slave node of a previous level network;
for example, after the network receives the second and subsequent accurate time alignment messages from the node, the accurate time alignment message is analyzed to obtain that the calendar time carried in the accurate time alignment message is 12 hours, 32 minutes, 23 seconds and 564 milliseconds, and meanwhile, according to the message transmission delay obtained according to the calculation is 16, the clock counter of the network slave node counts the intervalFor 10ms, then the calculation may be:
；
the obtained local calendar time after compensating the communication delay is processedUpdating the writing device.
Specifically, in this embodiment, the updating of the accurate time alignment message in step S3 specifically includes: the network slave node respectively replaces the updated local calendar time and the network clock count value in the accurate time alignment message, and updates the network hierarchy of the network slave node to the finite field identifier in the accurate time alignment message, so that the updated accurate time alignment message is sent to the next network slave node.
Specifically, in this embodiment, in order to embody the practicality and effectiveness of the present invention, two sets of low-voltage power internet of things communication systems are respectively built, each system has 508 slave nodes, the maximum network level is 6, and other system parameter settings are consistent except that the used time setting methods are different; the two sets of low-voltage power internet of things communication systems respectively adopt a whole network broadcasting time setting method and the accurate time setting method to set time for slave nodes in the systems, root nodes of the two sets of systems initiate 3 time setting messages to the slave nodes in the network every hour, and each time is separated by 10 minutes; the master station side respectively calls calendar time of slave nodes in two sets of communication systems every 1 hour, judges whether the difference value between the calendar time of the slave nodes and the calendar time of the root node is within 5 seconds, and counts the success rate of system time synchronization. Referring to fig. 4, the time setting success rate curve counted by the master station can be seen that under the condition that the network scale is up to 508 nodes, the method can still effectively complete the accurate time setting task, the time setting success rate of each round of time setting is more than 99.6%, the time setting success rate of the broadcasting time setting system is obviously lower than that of the method, the fluctuation amplitude is larger, and the time setting success rate can be effectively improved even in the low-voltage power internet of things with larger network scale and higher time setting precision requirement.
The foregoing description of the preferred embodiments of the present invention should not be construed as limiting the scope of the invention, but rather as utilizing equivalent structural changes made in the description of the present invention and the accompanying drawings or directly/indirectly applied to other related technical fields under the inventive concept of the present invention.
Claims (6)
1. The accurate time setting method for the electric power Internet of things is characterized by comprising the following steps of:
s1, a master station issues a time synchronization instruction to a network root node, the network root node forms an accurate time synchronization message based on the time synchronization instruction, and the accurate time synchronization message is issued to a network slave node; the network root node periodically transmits the accurate time alignment message to the network slave node by adopting a finite field broadcasting mode;
s2, the network slave node calculates message transmission delay according to the accurate time alignment message;
the network receives and analyzes the accurate time alignment message from the node;
judging the sizes of the network levels and the finite field identifiers in the accurate alignment message; the method comprises the following steps:
if the network hierarchy of the network slave node is the same as or equal to the finite field identifier in the accurate time alignment message plus 1, the network slave node calculates the message transmission delay and sets the forwarding flag of the message to 1; otherwise, discarding the accurate time alignment message;
when a network slave node receives a precise time alignment message of a network root node or a previous-level network slave node for the first time, the network slave node executes local clock count following operation according to the precise time alignment message;
when a network slave node does not receive the accurate time alignment message of a network root node or a previous-level network slave node for the first time, the network slave node executes local clock counting synchronization operation according to the accurate time alignment message and calculates message transmission delay;
s3, the network slave node updates the node time and the accurate time alignment message based on the accurate time alignment message and the message transmission delay, and sends the updated accurate time alignment message to the next-stage network slave node; the network slave node adopts a finite field broadcasting mode to periodically issue the accurate time alignment message to the next-stage network slave node;
s4, repeating the steps S2-S3 until the network time synchronization of all nodes in the network is completed.
2. The accurate time setting method of the electric power internet of things according to claim 1, wherein the accurate time setting message comprises local calendar time, a network clock count value and a finite field identifier.
3. The method for accurately timing the electric power internet of things according to any one of claims 1-2, wherein the network slave node performs a local clock count following operation according to the accurately timing message, specifically:
；
wherein ,ith precision sent for network root node or upper level network slave nodeNetwork clock count value carried in time-setting message +.>Counting an initial value for a network clock of a current network slave node, < >>Every +.>Automatically counting by a timer, < > the>For the time interval that the timer automatically counts.
4. The accurate time setting method of the electric power internet of things according to claim 3, wherein the network slave node performs a local clock count synchronization operation according to the accurate time setting message, and calculates a message transmission delay, specifically:
calculating the difference value of network clock count values in the accurate time alignment messages sent from the adjacent front and back of the network root node or the upper-level network slave node; calculating the difference value of the local clock count value of the network when the network receives the accurate time alignment message from the front and back of the adjacent nodes;
calculating the frequency deviation of the local clock count value and the network clock count value based on the difference value of the network clock count value and the difference value of the local clock count value;
and calculating the message transmission delay according to the frequency deviation.
5. The accurate time setting method of the electric power internet of things according to any one of claims 1-2, wherein the updating of the node time in the step S3 is specifically:
calculating a local calendar time difference value of a slave node of the current network;
；
wherein ,for the local calendar time difference,/>For message transmission delay->A time interval for the timer to count automatically;
calculating and updating the local calendar time in the accurate time alignment message;
；
wherein ,for updated local calendar time, +.>The local calendar time carried in the accurate time alignment message is sent by the network root node or the slave node of the upper-level network.
6. The method for accurately timing the electric power internet of things according to any one of claims 1-2, wherein the updating of the accurate timing message in step S3 specifically includes:
the network slave node respectively replaces the updated local calendar time and network clock count value in the accurate time alignment message, and updates the network hierarchy of the network slave node to the finite field identification in the accurate time alignment message.
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