Time synchronization method, device, differential protection device, terminal and storage medium

Abstract

The present application relates to a time synchronization method, device, differential protection device, terminal and storage medium. The embodiment of the present application includes: obtaining an air interface signal sent by a 5G base station; parsing the air interface signal to obtain a first time information; and calculating the second time information based on the first time information to complete time synchronization. According to the scheme provided in the embodiment of the present application, the air interface signal of the 5G base station equipment is used to synchronize the time of the differential protection device, effectively improving the reliability and stability of the time synchronization of the differential protection device, and further ensuring the safe operation of the power system.

Description

Technical Field

[0001] The embodiments of the present application relate to but are not limited to the field of communication technology, and in particular to a time synchronization method, device, data transmission system and differential protection device. Background Art

[0002] With the development of social economy, the power system is becoming more and more intelligent. The differential protection device in the power system determines whether relay protection is needed for the fault area based on the comparison of the electrical quantities at both ends of the transmission line at the same time, that is, the electrical quantities on the local side and the opposite side. The operation of the power system changes rapidly, so in order to ensure its safe, stable and reliable operation, the differential protection device needs to have a unified time reference, that is, strict time synchronization.

[0003] At present, the time synchronization of the power system is based on the satellite timing technology of the US GPS (Global Positioning System) or the Chinese BDS (BeiDou Navigation Satellite System) satellite timing technology, but there are the following problems: the time synchronization signal obtained based on GPS or BDS is likely to be degraded, which may be caused by factors such as the anti-interference technology of the GPS or BDS signal receiver, the geographical location of the receiver, weather conditions, electromagnetic interference and even human operation. Abnormal time synchronization will bring huge hidden dangers to the operation of the power system. Summary of the invention

[0004] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0005] The embodiments of the present application provide a time synchronization method, device, power transmission system, differential protection device and storage medium, which can obtain time information through a 5G base station, realize time synchronization of the differential protection device, and thus improve the safety, reliability and stability of the power system.

[0006] On the first aspect, an embodiment of the present application provides a time synchronization method, which is applied to a differential protection device. The method receives an air interface signal sent by a 5G base station, parses and obtains first time information, and calculates second time information based on the first time information, thereby achieving time synchronization with the base station.

[0007] On the second aspect, an embodiment of the present application provides a time synchronization device, which is applied to a differential protection device, including a 5G communication module for receiving an air interface signal sent by a 5G base station and converting the air interface signal into a time synchronization signal, and a time synchronization module for calculating the second time information based on the first time information in the time synchronization signal and completing the time synchronization.

[0008] In a third aspect, an embodiment of the present application provides a differential protection device, including a differential protection module for providing relay protection for a power system and an interface module for performing internal data transmission.

[0009] In a fourth aspect, an embodiment of the present application further provides a terminal, comprising at least: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method of the first aspect when executing the computer program.

[0010] In a fifth aspect, an embodiment of the present application further provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the method of the first aspect as described above.

[0011] The embodiment of the present application obtains time information through a 5G base station and uses the time information as the synchronization time information of the differential protection device, thereby realizing the time synchronization of the differential protection device, avoiding the risk of signal degradation caused by direct timing of GPS or BDS, and improving the safety, reliability and stability of the power system.

[0012] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of a power system architecture based on a 5G communication system provided in an embodiment of the present application;

[0014] Figure 2 A schematic diagram of a time synchronization method according to an embodiment of the present invention;

[0015] Figure 3 A schematic diagram of a time synchronization method according to another embodiment of the present invention;

[0016] Figure 4 A schematic diagram of a module of a time synchronization device provided by another embodiment of the present application;

[0017] Figure 5 A module schematic diagram of a differential protection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0020] In the description of the embodiments of the present application, unless otherwise clearly defined, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the embodiments of the present application in combination with the specific content of the technical solution. It can be known by those skilled in the art that the description of this embodiment is not only applicable to the power system, but can also be applied to all systems that require high-precision time synchronization. The power system is only a preferred application scenario of this embodiment.

[0021] 5G base stations have multiple clock sources that can coexist at the same time. The existing clock source types can be divided into satellite timing systems and wired timing systems. Satellite timing systems include, for example, the United States' GPS (Global Positioning System), China's BDS (BeiDou Navigation Satellite System), Russia's GLONASS, and Europe's Galileo. Wired timing systems include, for example, NTP (Network Time Protocol), SNTP (Simple Network Time Protocol), PTP--Precision Time Protocol, high-precision synchronization protocol and IEEE1588 (Institute of Electrical and Electronics Engineers 1588). Therefore, 5G base stations can select the clock source with the best signal quality based on the time synchronization signal quality of different clock sources to provide time information for other devices in the 5G communication system.

[0022] Based on this, the embodiments of the present application provide a time synchronization method and device, a data transmission method and system, a terminal, a storage medium and a differential protection device applied to a differential protection device, so that the differential protection device can obtain time information through a 5G base station, thereby realizing time synchronization of the differential protection device, thereby improving the safety, reliability and stability of the power system.

[0023] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0024] Figure 1 A schematic diagram of a power system architecture based on a 5G communication system provided in an embodiment of the present application. Figure 1 The power system architecture shown includes at least:

[0025] 5G base station, the first differential protection device, i.e. the differential protection device on this side, and the second differential protection device, i.e. the differential protection device on the opposite side. The differential protection devices on this side and the opposite side can communicate with the 5G base station through the 5G network.

[0026] The specific communication process is that the 5G communication module inside the differential protection device on this side transmits the data to the 5G base station through the air interface. After receiving the data from the differential protection device on this side, the 5G base station uploads it to the base station core network server through the backhaul bearer network. The base station core network server then transmits the data of the differential protection device through the gateway, from the public backbone network / grid private network to the power grid server, thus completing the uplink data transmission. During the downlink data transmission process, the power grid server transmits the data to the base station core network server through the gateway via the public backbone network / grid private network, then to the 5G base station, and finally to the differential protection device on the opposite side, thus completing the downlink data transmission.

[0027] Based on this, the differential protection device on this side and the differential protection device on the opposite side realize mutual data transmission through the 5G network.

[0028] The embodiment of the present application realizes its data transmission service by designing a differential protection device with the function of communicating with the base station equipment. Since the 5G wireless communication channel is used for data transmission, the cost of building stations and networks and the maintenance cost of the power grid are effectively reduced.

[0029] In a first aspect, an embodiment of the present application provides a time synchronization method applied to a differential protection device.

[0030] Figure 2 A schematic diagram of a time synchronization method flow chart provided in an embodiment of the present application at least includes:

[0031] Step S100: Receive the air interface signal sent by the 5G base station.

[0032] Before the above step S100, the 5G base station selects the time information of the clock source with the best signal quality from multiple clock sources to perform time synchronization for the entire network, or performs time synchronization for the entire network in a preset clock source selection order. This time information is the first time information T1.

[0033] Furthermore, the 5G base station encapsulates the first time information T1 in the system information block (SIB) of the air interface frame as an air interface signal and broadcasts it.

[0034] Step S200: parse the air interface signal to obtain first time information.

[0035] After receiving the broadcast message from the 5G base station, the first time information T1 sent by the 5G base station is parsed from the system information block SIB.

[0036] Step S300: Calculate the second time information according to the first time information to complete time synchronization.

[0037] Specifically, the air interface transmission link delay of the 5G base station, that is, the air interface delay ΔT, is obtained, and then the second time information T2 is obtained, and the second time information T2 = T1 + ΔT.

[0038] Specifically, the 5G base station eNB air interface sends downlink information to the user equipment UE in the 5G communication system. In this embodiment, the user equipment can be a differential protection device. After receiving the above downlink information, the user equipment UE will send uplink information to the 5G base station. After receiving the above uplink information, the 5G base station compares the information sent and the information received. The time information difference between the two is the timing advance TA. The timing advance TA includes the round-trip air interface delay, so the air interface delay ΔT = TA / 2. After obtaining the second time information T2, the time synchronization is completed. Power grid equipment in different geographical locations can obtain the corresponding TA value through this method to correct the time synchronization error, thereby improving the accuracy of time synchronization.

[0039] Figure 3 The following is a flow chart of the time synchronization method provided in the embodiment of the present application. Figure 3 The time synchronization method shown at least includes:

[0040] S400: The uplink data of the differential protection device on this side is transmitted to the 5G base station via the air interface.

[0041] The power-related data generated inside the differential protection device on this side will be uploaded to the 5G base station via the air interface.

[0042] S500: After receiving the uplink data from the differential protection device on this side, the 5G base station transmits the uplink data to the core network server through the backhaul bearer network.

[0043] Based on the 5G network architecture, the 5G base station will upload the received data to the core network server through the bearer network.

[0044] S600: The core network server then uploads the data transmitted by the 5G base station to the power grid server through the public backbone network / power grid private network.

[0045] S700: The power grid server transmits downlink data to the core network server through the public backbone network / power grid private network.

[0046] S800: After receiving the downlink data, the core network server transmits it to the 5G base station through the bearer network.

[0047] S900: The base station device transmits the downlink data to the differential protection device at the opposite side through the air interface, thereby completing the transmission of the downlink data.

[0048] Specifically, the differential protection device includes a differential protection device on this side and a differential protection device on the opposite side, and this side and the opposite side are relative to the two ends of the transmission line. In this embodiment, taking uplink data transmission as an example, the differential protection device on this side sends the power data of the differential protection device on this side to the 5G base station. After receiving the data, the 5G base station sends it to the base station core network server through the backhaul bearer network. The base station core network server then transmits the data transmitted by the base station through the gateway, and uploads it to the power grid server from the public backbone network / power grid private network to complete the transmission of uplink data. The downlink data transmission process is opposite to the uplink, and will not be repeated here. The process of transmitting data from the differential protection device on the opposite side to the differential protection device on this side is the same as the above-mentioned data transmission process, and will not be repeated here. Through the data transmission method in this embodiment, the data interaction between the differential protection device on this side and the differential protection device on the opposite side can be realized through the 5G network. Using 5G network instead of existing wired cables and optical fibers for data transmission between differential protection devices can effectively reduce the cost of wired networking in the power system.

[0049] In a second aspect, an embodiment of the present application provides a data transmission system, including a differential protection device on this side and a differential protection device on the opposite side; the differential protection device on this side includes: a first memory, a first processor, and a computer program stored on the first memory and executable on the first processor, and the first processor implements the time synchronization method of any embodiment of the first aspect when executing the program. Correspondingly, the differential protection device on the opposite side includes: a second memory, a second processor, and a computer program stored on the second memory and executable on the second processor, and the second processor implements the time synchronization method of any embodiment of the first aspect when executing the program.

[0050] In a third aspect, an embodiment of the present application provides a time synchronization device, which is applied to a differential protection device.

[0051] Figure 4A module schematic diagram of a time synchronization device provided for another embodiment of the present application. In this embodiment, the time synchronization device is applied to a differential protection device, and the above-mentioned time synchronization device includes at least a 5G communication module, and the 5G communication module is used to receive and send air interface signals sent by a 5G base station; a time synchronization module, and the time synchronization module is used to calculate the second time information according to the first time information in the air interface signal and complete the time synchronization; and a data processing module, and the data processing module is used for processing and transmitting baseband digital signals.

[0052] Furthermore, the 5G communication module includes an antenna module and a radio frequency module.

[0053] In one embodiment, the antenna module includes an antenna, and the antenna can be a variety of antennas adapted to 5G communication. From the perspective of the direction of the antenna, the antenna can include an omnidirectional antenna and a directional antenna; from the perspective of the frequency band of 5G communication, the antenna can include a matrix antenna, a lens antenna, a waveguide slot antenna, and an array patch.

[0054] During the transmission process, the data processing module processes the power data of the differential protection device into a data packet that complies with the 5G communication protocol and transmits it through the RF module and antenna module; during the receiving process, the antenna module receives the air interface signal sent by the 5G base station and transmits it to the RF module, which converts the air interface signal into a time synchronization signal and a baseband digital signal. The time synchronization signal is transmitted to the time synchronization module for time synchronization to obtain time information, and the baseband digital signal is transmitted to the data processing module for processing to obtain data information of the power system.

[0055] Specifically, the time synchronization module parses the time synchronization signal to obtain the first time information T1, which is the absolute time directly obtained by the 5G base station from one or more of the multiple clock sources, and the first time T1 is encapsulated in the system information block SIB of the air interface signal. Further, the time synchronization module obtains the air interface transmission link delay of the 5G base station, that is, the air interface delay ΔT, and then obtains the second time information T2, and the second time information T2 = T1 + ΔT.

[0056] Specifically, the 5G base station eNB air interface sends downlink information to the user equipment UE in the 5G communication system. In this embodiment, the user equipment can be a differential protection device. After receiving the above downlink information, the user equipment UE will send uplink information to the 5G base station. After receiving the above uplink information, the 5G base station compares the information sent and the information received. The time information difference between the two is the timing advance TA. The timing advance TA includes the round-trip air interface delay, so the air interface delay ΔT = TA / 2, then the second time information T2 = T1 + TA / 2 = T1 + ΔT. After obtaining the second time information T2, time synchronization is completed. Power grid equipment in different geographical locations can obtain the corresponding TA value through this method to correct the time synchronization error, thereby improving the accuracy of time synchronization.

[0057] In a fourth aspect, an embodiment of the present application provides a differential protection device.

[0058] Figure 5 A module schematic diagram of a differential protection device provided in an embodiment of the present application.

[0059] In one embodiment, the differential protection device includes a 5G communication module, a time synchronization module, a data processing module, an interface module and a differential protection module; the 5G communication module includes an antenna module and a radio frequency module.

[0060] Specifically, the 5G communication module is used to receive and send air interface signals sent by the 5G base station; the time synchronization module is used to calculate the second time information based on the first time information in the air interface signal and complete time synchronization; the data processing module is used for processing and transmission of baseband digital signals; the interface module is used for data transmission between the time synchronization module and the differential protection module, and / or for data transmission between the data processing module and the differential protection module; the differential protection module is used to provide relay protection for the power system.

[0061] In one embodiment, taking the differential protection device on this side as an example, the antenna module transmits the air interface signal sent by the received 5G base station to the radio frequency module, and the radio frequency module converts the air interface signal into a time synchronization signal and a baseband digital signal. The time synchronization signal is transmitted to the time synchronization module, and the time synchronization module parses the first time information from the time synchronization signal. Based on the obtained air interface delay, the time synchronization module calculates and obtains the second time information, that is, the time information required for the operation of the differential protection device, and completes the time synchronization. The baseband digital signal is transmitted to the data processing module for processing, that is, the data processing module parses the baseband digital signal to obtain power system related data, and the above power system related data is the data of the differential protection device on the opposite side. The second time information obtained by the time synchronization module and the power system related data obtained by the data processing module are transmitted to the differential protection module via the interface module.

[0062] Correspondingly, the power data generated by the differential protection module on this side is also transmitted to the data processing module via the interface module, and sent to the 5G base station via the RF module and the antenna module.

[0063] Specifically, the interface module includes internal interfaces PCIE / USB / IRIG-B.

[0064] The differential protection module provides relay protection for the power system based on the second time information and power system related data. This embodiment obtains time information through a 5G base station and uses the time information as the synchronization time information of the differential protection device, thereby realizing the time synchronization of the differential protection device, avoiding the risk of signal degradation caused by direct timing of GPS or BDS, and improving the safety, reliability and stability of the power system.

[0065] In another embodiment, still taking the differential protection device on this side as an example, the differential protection module transmits the power system related data to the data processing module via the interface module. The data processing module processes the data to form a baseband digital signal, and transmits it to the radio frequency module for processing to form a radio frequency signal that can be transmitted by the antenna module. The antenna module sends the radio frequency signal containing the data of the differential protection device on this side to the 5G base station. After the 5G base station receives the radio frequency signal sent by the differential protection device on this side, it sends it to the core network server via the backhaul bearer network. The core network server then passes the data sent by the 5G base station through the gateway, and uploads it to the power grid server from the public backbone network / power grid dedicated network. The power grid server then sends the data of the differential protection device on this side to the differential protection device on the opposite side through the above reverse process. As a result, the differential protection device on this side and the differential protection device on the opposite side realize communication based on the 5G network. Using 5G network instead of existing wired cables and optical fibers for data transmission between differential protection devices can effectively reduce the cost of wired networking in the power system.

[0066] In a fifth aspect, an embodiment of the present application further provides a terminal, comprising at least: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method of the first aspect when executing the computer program.

[0067] In a sixth aspect, an embodiment of the present application further provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the method of the first aspect as described above.

[0068] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0069] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0070] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present application. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A time synchronization method, applied to a differential protection device, comprising: Obtain the air interface signal sent by the 5G base station; Parsing the air interface signal to obtain first time information T1 and power system related information; Calculate an air interface delay ΔT of an air interface transmission link, where the air interface delay is obtained according to a timing advance TA sent by the 5G base station; Add the air interface delay ΔT to the first time information T1 to calculate the second time information T2; Time synchronization with the base station is achieved according to the second time information T2 and the power system related information.

2. The method according to claim 1, characterized in that The first time information is encapsulated in a system information block.

3. A time synchronization device, applied to a differential protection device, comprising: A 5G communication module, wherein the 5G communication module is used to receive an air interface signal sent by a 5G base station and convert the air interface signal into a time synchronization signal and a baseband digital signal; A data processing module, the data processing module is used to analyze the baseband digital signal to obtain power system related information; A time synchronization module, wherein the time synchronization module is used to parse the time synchronization signal to obtain the first time information T1, calculate the air interface delay ΔT of the air interface transmission link, add the air interface delay ΔT to the first time information T1, calculate the second time information T2, and use the second time information T2 and the power system related information to complete time synchronization; wherein the air interface delay is obtained according to the timing advance TA sent by the 5G base station.

4. The time synchronization device according to claim 3, characterized in that: The 5G communication module also includes: An antenna module, the antenna module is used for receiving the air interface signal; A radio frequency module, wherein the radio frequency module is used for conversion between the air interface signal and the time synchronization signal, wherein the time synchronization signal includes the first time information.

5. A differential protection device, comprising the time synchronization device according to any one of claims 3 to 4, further comprising: A differential protection module, wherein the differential protection module is used to provide relay protection for the power system; An interface module, wherein the interface module realizes time synchronization between the time synchronization module and the differential protection module through information transmission between the time synchronization module and the differential protection module.

6. The differential protection device according to claim 5, characterized in that: The interface module also realizes the transmission of power data between the differential protection module and the data processing module through information transmission between the data processing module and the differential protection module.

7. A terminal, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 2 when executing the computer program.

8. A computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the method according to any one of claims 1 to 2.

Images