A method for global time synchronization of distribution network based on power line fusion communication technology

Abstract

The present invention discloses a method for global time synchronization of a distribution network area based on power line fusion communication technology, which relates to the technical field of distribution network, and includes the following steps: constructing a hierarchical synchronization architecture, dividing the distribution network into a trunk layer and a branch layer, setting a master node and a key node in the trunk layer, and the branch layer contains smaller sub-nodes; adopting a two-way time synchronization correction mechanism, and performing time correction through two-way communication between the master node and the sub-node; adopting a dynamic frequency adjustment algorithm, and automatically adjusting the transmission frequency of the synchronization signal according to the power line load and communication interference. The present invention can respond to the time difference between nodes in real time through the two-way time synchronization correction mechanism to ensure the accuracy of synchronization, and the dynamic frequency adjustment algorithm dynamically adjusts the transmission frequency of the synchronization signal according to the real-time load and interference, and further optimizes the synchronization accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution networks, and in particular to a method for global time synchronization of power distribution network stations based on power line fusion communication technology. Background Art

[0002] With the development of smart grids, the reliability and stability of distribution networks have become key issues. Modern distribution networks require precise time synchronization to ensure the coordinated operation of various devices and systems, optimize power distribution, reduce fault response time, and improve overall efficiency. However, traditional time synchronization methods face many challenges and are difficult to meet the high requirements of modern smart grids.

[0003] Traditional time synchronization methods are prone to signal delays and time errors in long-distance transmission, especially in complex geographical environments; it is difficult to dynamically adjust the transmission frequency of synchronization signals according to real-time conditions, resulting in reduced synchronization accuracy in high-load or high-interference environments. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above-mentioned problems existing in the existing distribution network area global time synchronization method based on power line converged communication technology, the present invention is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A method for global time synchronization of a distribution network area based on power line fusion communication technology, the method comprising the following steps:

[0008] S1: Build a hierarchical synchronization architecture, divide the distribution network into a trunk layer and a branch layer, set up master nodes and key nodes in the trunk layer, and the branch layer contains smaller sub-nodes;

[0009] S2: adopts a two-way time synchronization correction mechanism to perform time correction through two-way communication between the master node and the sub-node;

[0010] S3: Uses a dynamic frequency adjustment algorithm to automatically adjust the transmission frequency of the synchronization signal according to the power line load and communication interference.

[0011] As a preferred solution of the method for global time synchronization of distribution network area based on power line fusion communication technology described in the present invention, wherein: in the S2 process, the implementation steps of using the two-way time synchronization correction mechanism are as follows:

[0012] S21: The master node sends an initial synchronization signal to each sub-node;

[0013] S22: After receiving the synchronization signal, the child node immediately responds and transmits the current time information back to the master node;

[0014] S23: Correction calculation: the master node calculates the delay based on the returned time information, corrects the clock deviation, and sends the corrected time information to the child node again;

[0015] S24: After receiving the corrected time information, the child node provides confirmation feedback again, and the master node makes final adjustments based on the feedback to complete two-way time synchronization.

[0016] As a preferred solution of the method for global time synchronization of distribution network area based on power line fusion communication technology described in the present invention, the correction calculation method is:

[0017] Define a delay correction function ΔT as the time deviation correction value. The value range of ΔT is all real numbers because it represents the correction value of the time deviation, which can be positive or negative. Its expression is:

[0018]

[0019] Among them, T m is the timestamp of the master node, T s T is the time after the child node receives the timestamp from the master node. r The time when the child node returns the timestamp to the master node, T f is the time when the master node receives the timestamp returned by the child node. α is the attenuation factor, which indicates the attenuation degree of the signal in power line transmission. The attenuation factor, n, indicates the attenuation degree of the signal in power line transmission. is the timestamp sent by the master node for the i-th time, The timestamp of the child node returned for the i-th time.

[0020] As a preferred solution of the method for global time synchronization of distribution network area based on power line fusion communication technology described in the present invention, wherein: in the step S3, the dynamic frequency adjustment algorithm is:

[0021] S31: Data collection: real-time collection of data on power line load L(t) and communication interference I(t);

[0022] S32: Data processing: preprocessing the collected data to remove noise and outliers;

[0023] S33: Calculate adjustment coefficient: Calculate the influence coefficient of load and interference on frequency according to the preprocessed data;

[0024] S34: Adjust frequency: dynamically adjust the sending frequency of the synchronization signal according to the calculated influence coefficient.

[0025] As a preferred solution of the method for global time synchronization of distribution network area based on power line fusion communication technology described in the present invention, the calculation adjustment coefficients are respectively: load influence coefficient C L and interference influence coefficient C I , whose expressions are:

[0026]

[0027] C I =e -βI(t) ;

[0028] Among them, γ and β are adjustment factors, which are used to control the impact of load and interference on frequency respectively. is the cumulative value of the load in the time period T; this part represents the adjustment of the power line load on the frequency of the synchronization signal transmission. The higher the load, the smaller the frequency adjustment amplitude; e -βI(t) Indicates the impact of the interference intensity on the frequency at the current moment. The stronger the interference, the smaller the frequency adjustment;

[0029] Combined load influence coefficient C L and interference influence coefficient C I , the transmission frequency of the synchronization signal is defined as f(t), and its calculation formula is:

[0030] f(t)=fo·(1+C L )·C I ;

[0031] Wherein, fo is the sending frequency of the initial synchronization signal.

[0032] The present invention also discloses a distribution network area global time synchronization system, based on the above-mentioned distribution network area global time synchronization method based on power line fusion communication technology, comprising:

[0033] The hierarchical synchronization architecture building module divides the distribution network into a backbone layer and a branch layer, sets up master nodes and key nodes in the backbone layer, and the branch layer contains smaller sub-nodes; the master node is responsible for the time synchronization of the backbone layer, and the sub-nodes are synchronized through the key nodes; the two-way time synchronization correction module performs time correction through two-way communication between the master node and the sub-nodes; the dynamic frequency adjustment module automatically adjusts the sending frequency of the synchronization signal according to the power line load and communication interference; the real-time monitoring module configures monitoring modules at the master node and the key node to monitor the synchronization status and time deviation of each node in real time.

[0034] The present invention also discloses a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the above-mentioned distribution network area global time synchronization method based on power line converged communication technology are implemented.

[0035] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the above-mentioned method for global time synchronization of distribution network stations based on power line converged communication technology.

[0036] Beneficial effects of the present invention:

[0037] 1. The hierarchical synchronization architecture of the present invention allows synchronization nodes to be divided into levels, which reduces the complexity of synchronization signal transmission and improves the stability and reliability of synchronization;

[0038] 2. The present invention can respond to the time difference between nodes in real time through a two-way time synchronization correction mechanism to ensure the accuracy of synchronization. The dynamic frequency adjustment algorithm dynamically adjusts the sending frequency of the synchronization signal according to the real-time load and interference conditions, further optimizing the synchronization accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0040] Figure 1 This is a schematic diagram of the overall method of the distribution network area global time synchronization method based on power line fusion communication technology proposed by the present invention. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0042] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0044] After receiving the signal, it immediately responds and returns the current time information to the master node;

[0045] S23: Correction calculation: the master node calculates the delay based on the returned time information, corrects the clock deviation, and sends the corrected time information to the child node again;

[0046] The correction calculation method is:

[0047] Define a delay correction function ΔT as the time deviation correction value. The value range of ΔT is all real numbers because it represents the correction value of the time deviation, which can be positive or negative. Its expression is:

[0048]

[0049] Among them, T m is the timestamp of the master node, T s T is the time after the child node receives the timestamp from the master node. r The time when the child node returns the timestamp to the master node, T f is the time when the master node receives the timestamp returned by the child node. α is the attenuation factor, which indicates the attenuation degree of the signal in power line transmission. The attenuation factor, n, indicates the attenuation degree of the signal in power line transmission. is the timestamp sent by the master node for the i-th time, The timestamp of the child node returned for the i-th time.

[0050] The first half of the formula requires explanation: To calculate the delay difference of the round trip signal in a single communication process; and the second half: In order to perform exponential decay correction on multiple time synchronization signals, the cumulative effect of the signal during transmission is considered; the physical meaning of this value range is to correct the clock deviation between the master node and the child node, so that the synchronized time is more accurate

[0051] The specific implementation steps are:

[0052] First collect data: collect timestamp T from the master node and child nodes m 、T s 、T r 、T f ; Then calculate the single time delay difference: Then calculate multiple correction averages: Calculate multiple time synchronization signals: Then, the single delay difference and the average value of multiple corrections are combined to obtain the final time deviation correction value. Finally, the correction value ΔT is applied to the clock deviation correction of the child node to complete the time synchronization. Through this simplified formula design and implementation steps, the accuracy and stability of the global time synchronization method of the distribution network station area based on power line converged communication technology can be effectively improved.

[0053] S24: After receiving the corrected time information, the child node provides confirmation feedback again, and the master node makes final adjustments based on the feedback to complete two-way time synchronization.

[0054] S3: Uses a dynamic frequency adjustment algorithm to automatically adjust the transmission frequency of the synchronization signal according to the power line load and communication interference.

[0055] Specifically, the dynamic frequency adjustment algorithm is:

[0056] S31: Data collection: real-time collection of data on power line load L(t) and communication interference I(t);

[0057] S32: Data processing: preprocessing the collected data to remove noise and outliers;

[0058] S33: Calculate adjustment coefficient: Calculate the influence coefficient of load and interference on frequency according to the preprocessed data;

[0059] The calculation adjustment coefficients are: load influence coefficient C L and interference influence coefficient C I , whose expressions are:

[0060]

[0061] C I =e -βI(t) ;

[0062] Among them, γ and β are adjustment factors, which are used to control the impact of load and interference on frequency respectively. is the cumulative value of the load in the time period T; this part represents the adjustment of the power line load on the frequency of the synchronization signal transmission. The higher the load, the smaller the frequency adjustment amplitude; e -βI(t) Indicates the impact of the interference intensity on the frequency at the current moment. The stronger the interference, the smaller the frequency adjustment;

[0063] Combined load influence coefficient C L and interference influence coefficient C I , the transmission frequency of the synchronization signal is defined as f(t), and its calculation formula is:

[0064] f(t)=fo·(1+C L )·C I ;

[0065] Wherein, fo is the sending frequency of the initial synchronization signal.

[0066] The calculated f(t) is applied to the synchronization signal sending module to achieve dynamic frequency adjustment.

[0067] S34: Adjust frequency: dynamically adjust the sending frequency of the synchronization signal according to the calculated influence coefficient.

[0068] The present embodiment also provides a distribution network area global time synchronization system, which is based on the above-mentioned distribution network area global time synchronization method, including: a hierarchical synchronization architecture construction module, which divides the distribution network into a trunk layer and a branch layer, and sets a main node and a key node in the trunk layer, and the branch layer contains smaller sub-nodes; the main node is responsible for the time synchronization of the trunk layer, and the sub-nodes are synchronized through the key nodes; a two-way time synchronization correction module, which performs time correction through two-way communication between the main node and the sub-node; a dynamic frequency adjustment module, which automatically adjusts the sending frequency of the synchronization signal according to the power line load and communication interference; a real-time monitoring module, which configures the monitoring module at the main node and the key node to monitor the synchronization status and time deviation of each node in real time.

[0069] This embodiment also provides a computer device, which is applicable to the case of a distribution network area global time synchronization method based on power line converged communication technology, including: a memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the distribution network area global time synchronization method based on power line converged communication technology as proposed in the above embodiment.

[0070] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0071] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, it implements the method for realizing the global time synchronization of distribution network substations based on power line converged communication technology as proposed in the above embodiment; the storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read Only Memory, referred to as EPROM), programmable read-only memory (Programmable Red-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic storage, flash memory, disk or optical disk.

[0072] In summary, the hierarchical synchronization architecture of the present invention divides the synchronization nodes into levels, reduces the complexity of synchronization signal transmission, and improves the stability and reliability of synchronization; the present invention can respond to the time difference between nodes in real time through a two-way time synchronization correction mechanism to ensure the accuracy of synchronization, and the dynamic frequency adjustment algorithm dynamically adjusts the sending frequency of the synchronization signal according to the real-time load and interference conditions, further optimizing the synchronization accuracy.

[0073] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for global time synchronization of distribution network stations based on power line converged communication technology, characterized in that: The method comprises the following steps: S1: Build a hierarchical synchronization architecture, divide the distribution network into a trunk layer and a branch layer, set up master nodes and key nodes in the trunk layer, and the branch layer contains smaller sub-nodes; S2: adopts a two-way time synchronization correction mechanism to perform time correction through two-way communication between the master node and the sub-node; S3: Uses a dynamic frequency adjustment algorithm to automatically adjust the transmission frequency of the synchronization signal according to the power line load and communication interference; Among them, in the S2 process, the implementation steps of using the two-way time synchronization correction mechanism are: S21: The master node sends an initial synchronization signal to each sub-node; S22: After receiving the synchronization signal, the child node immediately responds and transmits the current time information back to the master node; S23: Correction calculation: the master node calculates the delay based on the returned time information, corrects the clock deviation, and sends the corrected time information to the child node again; S24: After receiving the corrected time information, the subnode sends a confirmation feedback again, and the master node makes a final adjustment based on the feedback to complete the two-way time synchronization; The correction calculation method is: Define a delay correction function As the time deviation correction value, The range of is all real numbers, because it represents the correction value of the time deviation, and its expression is: in, The timestamp of the master node. The time after the child node receives the timestamp from the master node. The time when the child node returns the timestamp to the master node, The time when the master node receives the timestamp returned by the child node. is the attenuation factor, which indicates the attenuation degree of the signal in power line transmission. Indicates the degree of signal attenuation during power line transmission. is the timestamp sent by the master node for the i-th time, The timestamp of the child node returned for the i-th time; In step S3, the dynamic frequency adjustment algorithm is: S31: Data collection: real-time collection of power line loads and communication interference data; S32: Data processing: preprocessing the collected data to remove noise and outliers; S33: Calculate adjustment coefficient: Calculate the influence coefficient of load and interference on frequency according to the preprocessed data; S34: Adjust frequency: dynamically adjust the sending frequency of the synchronization signal according to the calculated influence coefficient; The calculation adjustment coefficients are: load influence coefficient and interference influence coefficient , whose expressions are: in, They are adjustment factors, which are used to control the impact of load and interference on frequency. is the cumulative value of the load in the time period T; this part represents the adjustment of the power line load on the synchronization signal transmission frequency. The higher the load, the smaller the frequency adjustment amplitude; Indicates the impact of the interference intensity at the current moment on the frequency; the stronger the interference, the smaller the frequency adjustment; combined with the load influence coefficient and interference influence coefficient , define the sending frequency of the synchronization signal as , and its calculation formula is: in, The sending frequency of the initial synchronization signal.

2. A distribution network area global time synchronization system, based on the distribution network area global time synchronization method based on power line converged communication technology as claimed in claim 1, characterized in that: include: The hierarchical synchronization architecture building module divides the distribution network into the backbone layer and the branch layer. The main node and key nodes are set in the backbone layer, and the branch layer contains smaller sub-nodes; the master node is responsible for the time synchronization of the backbone layer, and the sub-nodes are synchronized through the key nodes; A two-way time synchronization correction module performs time correction through two-way communication between the master node and the sub-node; Dynamic frequency adjustment module, which automatically adjusts the transmission frequency of synchronization signals according to power line load and communication interference; Real-time monitoring module: A monitoring module is configured on the master node and key nodes to monitor the synchronization status and time deviation of each node in real time.

3. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method for global time synchronization of distribution network areas based on power line converged communication technology described in claim 1 are implemented.

4. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, the steps of the method for global time synchronization of distribution network areas based on power line converged communication technology described in claim 1 are implemented.

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