Time synchronization method, power grid equipment, network equipment and storage medium

Abstract

The present application relates to a time synchronization method, a power grid device, a network device and a storage medium. An embodiment of the present application includes: obtaining an air interface message from a network device; parsing the air interface message to obtain the network absolute time; and performing local time synchronization according to the network absolute time. According to the scheme provided in the embodiment of the present application, the air interface message of the network device is used to synchronize the time of the power grid device, and the power grid device does not need to synchronize the time through GPS / BDS, thereby overcoming the problem of poor reliability and stability of the GPS / BDS time synchronization signal, and effectively improving the reliability and stability of the time synchronization of the power grid device.

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, a power grid device, a network device, and a storage medium. Background Art

[0002] The modern power grid is a synchronous system, and its dispatching, automatic control, protection, stability control, fault location analysis and other services are inseparable from the time synchronization system.

[0003] In the known power grid time synchronization technology, power grid equipment uses GPS (Global Positioning System) or Beidou Satellite System (BDS) for time synchronization. However, due to the anti-interference technology of the GPS / BDS receiver itself, the geographical environment where it is installed, weather changes, electromagnetic interference, and human operation, the GPS / BDS time synchronization signal has poor reliability and stability. Summary of the invention

[0004] The embodiments of the present application provide a time synchronization method, a power grid device, a network device, and a storage medium, which can effectively improve the reliability and stability of the time synchronization of the power grid device.

[0005] In a first aspect, an embodiment of the present application provides a time synchronization method, which is applied to a power grid device, including:

[0006] Obtain air interface messages from network devices;

[0007] Parsing the air interface message to obtain network absolute time;

[0008] The local time is synchronized according to the network absolute time.

[0009] In a second aspect, an embodiment of the present application provides a time synchronization method, which is applied to a network device, including:

[0010] An air interface message carrying the network absolute time is sent to a power grid device, so that the power grid device executes the time synchronization method as described in the first aspect.

[0011] In a third aspect, an embodiment of the present application provides a power grid device, comprising: a first memory, a first processor, and a computer program stored in the first memory and executable on the first processor, wherein when the first processor executes the program, it implements: the time synchronization method as described in the first aspect.

[0012] In a fourth aspect, an embodiment of the present application provides a network device, comprising: a second memory, a second processor, and a computer program stored in the second memory and executable on the second processor, wherein when the second processor executes the program, it implements: the time synchronization method as described in the second aspect.

[0013] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to:

[0014] Execute the time synchronization method described in the first aspect or the second aspect.

[0015] The embodiment of the present application includes: obtaining an air interface message from a network device; parsing the air interface message to obtain the network absolute time; and performing local time synchronization according to the network absolute time. According to the solution provided by the embodiment of the present application, the air interface message of the network device is used to synchronize the time of the power grid device, and the power grid device does not need to synchronize the time through GPS / BDS, thereby overcoming the problem of poor reliability and stability of GPS / BDS time synchronization signals, and effectively improving the reliability and stability of time synchronization of power grid devices.

[0016] 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

[0017] The accompanying drawings are used to provide further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0018] Figure 1 is a flow chart of a time synchronization method provided by an embodiment of the present application;

[0019] Figure 2 is a flow chart of a time synchronization method provided by another embodiment of the present application;

[0020] Figure 3 is a flow chart of a time synchronization method provided by another embodiment of the present application;

[0021] Figure 4 is a flow chart of a time synchronization method provided by another embodiment of the present application;

[0022] Figure 5 is a flow chart of a time synchronization method provided by another embodiment of the present application;

[0023] Figure 6is a flow chart of a time synchronization method provided by another embodiment of the present application;

[0024] Figure 7 is a flow chart of a time synchronization method provided by another embodiment of the present application;

[0025] Figure 8 is a flow chart of a time synchronization method provided by another embodiment of the present application;

[0026] Fig. 9 is a flow chart of a time synchronization method provided by another embodiment of the present application;

[0027] Fig.10 is a flow chart of a time synchronization method provided by another embodiment of the present application;

[0028] Fig.11 is a flow chart of a time synchronization method provided by another embodiment of the present application;

[0029] Fig.12 is a flow chart of a time synchronization method provided by another embodiment of the present application;

[0030] Fig.13 This is a block diagram of the internal circuit of a power grid device provided by an embodiment of the present application;

[0031] Fig.14 An embodiment of the present application provides a block diagram of the power grid communication system architecture. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] In the known power grid time synchronization technology, power grid equipment uses GPS (Global Positioning System) or Beidou Satellite System (BDS) for time synchronization. However, due to the anti-interference technology of the GPS / BDS receiver itself, the geographical environment where it is installed, weather changes, electromagnetic interference, and human operation, the GPS / BDS time synchronization signal has poor reliability and stability.

[0035] Based on this, the embodiments of the present application provide a time synchronization method, a power grid device, a network device and a storage medium, which can effectively improve the reliability and stability of the time synchronization of the power grid device.

[0036] It should be noted that in the following various embodiments, the power grid equipment is a device that needs time synchronization in the power grid system or a device that needs to provide time synchronization signals to other devices in the power grid system, such as a phase measurement unit (PMU), a measurement and control device, an event sequence recording device, etc. The power grid equipment is provided with a functional module that supports base station air interface timing and data transmission. The following is a detailed description taking the power grid equipment as a phase measurement unit as an example.

[0037] The network device may be a device for communicating with a terminal device (such as a power grid device), and the network device may include a base station, a repeater, or other network-side devices with base station functions. For example, the network device may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, or a base station (NodeB, NB) in a WCDMA system, or an evolved base station (Evolved Node B, eNB or eNodeB) in an LTE system, or a network-side device (such as a gNB base station) in a 5G (5th Generation Wireless Systems, fifth generation mobile communication system) network, or the network device may be a relay station, an access point, a vehicle-mounted device, a wearable device, etc. The following embodiments are only described by taking the network device as a gNB base station (5G base station) as an example.

[0038] In a first aspect, an embodiment of the present application provides a time synchronization method applied to power grid equipment.

[0039] In some embodiments, the power grid equipment is a phase measurement unit, which is provided with a functional module supporting 5G air interface timing and data transmission, and is used to provide clock synchronization function and / or data transmission function for power grid equipment such as power plants / substations.

[0040] Reference Figure 1 In some embodiments, the time synchronization method comprises the steps of:

[0041] S1100, obtaining an air interface message from a network device;

[0042] S1200, parsing the air interface message to obtain the network absolute time;

[0043] S1300: Synchronize the local time according to the network absolute time.

[0044] In some embodiments, in step S1100, the air interface message includes a SIB (System Information Block) broadcast message. After the network device is synchronized with the clock source, it encapsulates the synchronized network absolute time into the SIB broadcast message, and then transmits it to the power grid device through the air interface in a broadcast manner. Among them, the clock source of the network device may include one or more of the following: GPS, BDS, GLONASS (Global Navigation Satellite System), Galileo (Galileo satellite navigation system), IEEE1588 (Precision Clock Synchronization Protocol Standard for Network Measurement and Control Systems), NTP (Network Time Protocol), etc. In some embodiments, since there are multiple clock sources, the network device can select the best source according to the clock quality of different clock sources, so the reliability and stability are higher. In some embodiments, the timing of the power grid device can adopt the SIB broadcast message of the network device, so it does not occupy the air interface resources of the wireless service of the network device.

[0045] In some embodiments, in step S1200, since the SIB broadcast message is used to encapsulate the network absolute time, the accuracy of the network absolute time can reach 10ms. In some improved schemes, it can even reach 10ns, which can effectively meet the clock accuracy requirements of power grid equipment.

[0046] In some embodiments, in step S1300, the local absolute time is calculated based on the network absolute time, and then the local absolute time is converted into IRIG-B (InterRange Instrumentation Group) code or synchronous Ethernet clock for use by substation / power plant relay protection and other equipment.

[0047] In the embodiments of the present application, on the one hand, the network equipment synchronizes the time of the power grid equipment through the SIB broadcast message. The power grid equipment only needs to parse the SIB broadcast message to obtain the absolute network time for time synchronization. There is no need to perform relevant processing algorithms of wireless signals to obtain the synchronization time, which makes the timing of the power grid equipment simple and fast. On the other hand, since the timing of the power grid equipment adopts the SIB broadcast message of the network equipment, it does not occupy the air interface resources of the wireless service of the network equipment.

[0048] Reference Figure 2 In some embodiments, the time synchronization method further comprises the steps of:

[0049] S1400, obtaining an air interface transmission link delay message from a network device;

[0050] Correspondingly, in step S1300, local time synchronization is performed according to the network absolute time, including:

[0051] The local absolute time is obtained according to the network absolute time and the air interface transmission link delay message, and the local time is synchronized according to the local absolute time.

[0052] In some embodiments, in step S1400, the power grid device can obtain the TA (Timing Advance) value of the power grid device and the network device as the air interface transmission link delay message through the uplink PREACH (Physical Random Access Channel) signal. For example, downlink information can be sent to the power grid device through the air interface of the network device, and the power grid device processes the downlink information and sends uplink information to the network device. After the network device receives the information, it compares the downlink information sent and the uplink information received. The difference between the frame time information of the two is the TA value, and the network device then informs the power grid device of the TA value. In some examples, the one-way transmission delay detT = TA / 2.

[0053] In some embodiments, in step S1300, the local absolute time is obtained according to the network absolute time and the air interface transmission link delay message. The local absolute time can be calculated according to the relationship T1=T0+detT=T0+TA / 2; wherein T1 is the local absolute time, T0 is the network absolute time, and detT is the one-way transmission delay. Power grid devices in different geographical locations can obtain the TA value of the power grid device through this method to correct the time synchronization error, thereby improving the accuracy of time synchronization.

[0054] Reference Figure 3 In some embodiments, the time synchronization method further comprises the steps of:

[0055] S1500, obtaining a PSS (Primary Synchronization Signal) signal and an SSS (Secondary Synchronization Signal) signal from a network device;

[0056] S1600, according to the PSS signal and the SSS signal, phase synchronization and frequency synchronization between the power grid device and the network device are realized.

[0057] In some embodiments, steps S1500 and S1600 are generally performed at the initial stage of power-on of the power grid device. The power grid device may generally have frequency and phase errors with the network device when powered on. At this time, the power grid device attempts to detect the PSS signal. According to the detected PSS signal, a rough frequency offset estimation is performed. Then, the power grid device detects the SSS signal. According to the detected SSS signal, the power grid device implements radio frame synchronization. Thus, phase synchronization and frequency synchronization between the power grid device and the network device are achieved.

[0058] Reference Figure 4 In some embodiments, the time synchronization method further comprises the steps of:

[0059] S1700, transmit the uplink data to the network device through the air interface transmission link, so that the network device uploads the uplink data to the power grid server through the communication network.

[0060] S1800, receiving downlink data from a network device through an air interface transmission link, where the downlink data is transmitted from a power grid server to the network device through a communication network.

[0061] Traditional power grid equipment data transmission is based on cables or optical fibers, and the cost of building a station and network and the maintenance cost are very high. With the new requirements for timing and data transmission put forward by services such as new energy grid connection, wide-area measurement, control and protection, the cost, equipment size, engineering installation and operation and maintenance of power grid equipment have brought huge challenges. To this end, the embodiment of the present application implements the power grid equipment data transmission service by designing a power grid equipment with the function of communicating with network equipment.

[0062] In some embodiments, the communication network includes a bearer network, a core network, a public backbone network, a power grid private network, etc.

[0063] Reference Figure 5 In some embodiments, step S1700 includes:

[0064] S1710, the 5G module inside the power grid equipment (such as the PMU device) carries the transmission data in a wireless transmission mode, and transmits the uplink data processed inside the power grid equipment to the network device through the air interface transmission link;

[0065] S1720, after receiving the uplink data from the power grid equipment, the network device transmits the uplink data to the core network server through the backhaul bearer network;

[0066] S1730, the core network server then transmits the data transmitted by the network device to the power grid server through the gateway via the public backbone network / power grid private network, completing the transmission of the uplink data.

[0067] The data flow of the power grid server sending downlink data to the power grid device is the opposite process of S1710-S1730, thereby completing the transmission of the downlink data.

[0068] Reference Figure 6 In some embodiments, step S1800 includes:

[0069] S1810, the power grid server transmits the downlink data to the core network server via the public backbone network / power grid private network;

[0070] S1820, the core network server receives the downlink data and transmits it to the network device through the bearer network;

[0071] S1830, the network device transmits the downlink data to the power grid device (such as the PMU device) through the air interface transmission link, completing the transmission of the downlink data.

[0072] The embodiment of the present application implements the power grid equipment data transmission service by designing power grid equipment with the function of communicating with network equipment. Since wireless communication channels are used for data transmission, the cost of building stations and networks and the maintenance cost of the power grid are effectively reduced.

[0073] In a second aspect, an embodiment of the present application provides a time synchronization method applied to a network device.

[0074] Reference Figure 7 In some embodiments, the time synchronization method includes:

[0075] S2100, sending an air interface message carrying network absolute time to a power grid device, so that the power grid device executes a time synchronization method as described in any implementation of the first aspect.

[0076] In some embodiments, in step S2100, the air interface message includes a SIB (System Information Block) broadcast message. After the network device is synchronized with the clock source, it encapsulates the synchronized network absolute time into the SIB broadcast message, and then transmits it to the power grid device through the air interface in a broadcast manner. Among them, the clock source of the network device may include one or more of the following: GPS, BDS, GLONASS (Global Navigation Satellite System), Galileo (Galileo satellite navigation system), IEEE1588 (Precision Clock Synchronization Protocol Standard for Network Measurement and Control Systems), NTP (Network Time Protocol), etc. In some embodiments, since there are multiple clock sources, the network device can select the best source according to the clock quality of different clock sources, so the reliability and stability are higher. Since the power grid equipment uses the SIB broadcast message of the network device for timing, it does not occupy the air interface resources of the wireless service of the network device.

[0077] In some embodiments, in step S2100, due to the use of SIB broadcast message to encapsulate network absolute time, the accuracy of network absolute time can reach 10ms. In some improved schemes, the timing accuracy can even reach 10ns, which can effectively meet the clock accuracy requirements of power grid equipment.

[0078] In the embodiments of the present application, on the one hand, the network equipment synchronizes the time of the power grid equipment through the SIB broadcast message. The power grid equipment only needs to parse the SIB broadcast message to obtain the absolute network time for time synchronization. There is no need to perform relevant processing algorithms of wireless signals to obtain the synchronization time, which makes the timing of the power grid equipment simple and fast. On the other hand, since the power grid equipment synchronizes the time using the SIB broadcast message of the network equipment, it does not occupy the air interface resources of the wireless service of the network equipment.

[0079] Reference Figure 8 In some embodiments, the time synchronization method further comprises the steps of:

[0080] S2200, sending an air interface transmission link delay message to a power grid device;

[0081] Correspondingly, in step S2100, an air interface message carrying the network absolute time is sent to the power grid device so that the power grid device executes the time synchronization method of any implementation manner of the first aspect, including:

[0082] Send an air interface message with network absolute time to the power grid equipment, so that the power grid equipment can obtain the local absolute time according to the network absolute time and the air interface transmission link delay message.

[0083] In some embodiments, in step S2200, the network device obtains the TA (Timing Advance) value as the air interface transmission link delay message through the uplink PREACH (Physical Random Access Channel) signal, and then informs the power grid device of the TA value. For example, downlink information can be sent to the power grid device through the air interface of the network device, and the power grid device processes the downlink information and sends uplink information to the network device. After the network device receives the information, it compares the downlink information it sends and the uplink information it receives. The difference between the frame time information of the two is the TA value, and the network device then informs the power grid device of the TA value. In some examples, the one-way transmission delay detT = TA / 2.

[0084] In some embodiments, in step S2200, the local absolute time is obtained according to the network absolute time and the air interface transmission link delay message. The local absolute time can be calculated according to the relationship T1=T0+detT=T0+TA / 2; wherein T1 is the local absolute time, T0 is the network absolute time, and detT is the one-way transmission delay. 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.

[0085] Reference Fig. 9 In some embodiments, the time synchronization method further comprises the steps of:

[0086] S2300, send a PSS (Primary Synchronization Signal) signal and an SSS (Secondary Synchronization Signal) signal to the power grid device, so that the power grid device can achieve phase synchronization and frequency synchronization between the power grid device and the network device according to the PSS signal and the SSS signal.

[0087] In some embodiments, step S2300 is generally performed at the initial stage of power-on of the power grid device. The power grid device may usually have frequency and phase errors with the network device when powered on. At this time, the PSS model and SSS signal are sent to the power grid device. The power grid device attempts to detect the PSS signal. Based on the detected PSS signal, a rough frequency offset estimate is performed. Then, the power grid device detects the SSS signal. Based on the detected SSS signal, the power grid device achieves radio frame synchronization. Thereby achieving phase synchronization and frequency synchronization between the power grid device and the network device.

[0088] Reference Fig.10 In some embodiments, the time synchronization method further comprises the steps of:

[0089] S2400, obtains uplink data from the power grid equipment through the air interface transmission link, and uploads the uplink data to the power grid server through the communication network;

[0090] S2500, receiving downlink data from a power grid server through a communication network, and transmitting the downlink data to a power grid device.

[0091] Traditional power grid equipment data transmission is based on cables or optical fibers, and the cost of building a station and network and the maintenance cost are very high. With the new requirements for timing and data transmission put forward by services such as new energy grid connection, wide-area measurement, control and protection, the cost, equipment size, engineering installation and operation and maintenance of power grid equipment have brought huge challenges. To this end, the embodiment of the present application implements the power grid equipment data transmission service through network equipment.

[0092] In some embodiments, the communication network includes a bearer network, a core network, a public backbone network, a power grid private network, etc.

[0093] Reference Fig.11 In some embodiments, step S2400 includes:

[0094] S2410, the network device obtains uplink data from the power grid device through the air interface transmission link;

[0095] S2420, after receiving the uplink data from the power grid equipment, the network device transmits the uplink data to the core network server through the backhaul bearer network;

[0096] S2430, the core network server then transmits the data transmitted by the network device to the power grid server through the gateway via the public backbone network / power grid private network, completing the transmission of the uplink data.

[0097] The data flow of the power grid server sending downlink data to the power grid device is the opposite process of S2510-S2530, thereby completing the transmission of the downlink data.

[0098] Reference Fig.12 In some embodiments, step S2600 includes:

[0099] S2510, the power grid server transmits the downlink data to the core network server via the public backbone network / power grid private network;

[0100] S2520, the core network server receives the downlink data and transmits it to the network device through the bearer network;

[0101] S2530, the network device transmits the downlink data to the power grid device (such as the PMU device) through the air interface transmission link, completing the transmission of the downlink data.

[0102] The embodiment of the present application implements the data transmission service of power grid equipment through network equipment. Since wireless communication channels are used for data transmission, the cost of establishing a station and a network and the maintenance cost of the power grid are effectively reduced.

[0103] In a third aspect, an embodiment of the present application provides a power grid device, comprising: a first memory, a first processor, and a computer program stored in the first memory and executable on the first processor, wherein when the first processor executes the program, it implements: a time synchronization method as in any embodiment of the first aspect.

[0104] Reference Fig.13 In some embodiments, the power grid device is a PMU device. The PMU device includes a microprocessor 104, an AD converter 103, a low-pass filter 102, a voltage / current transformer 101, a frequency tracker 106, a storage unit 105, a 5G air interface timing data transmission module 107, and a synchronization signal generator 108. The output end of the voltage / current transformer 101 is connected to the input end of the low-pass filter 102, the first output end of the low-pass filter 102 is connected to the AD converter 103, the second output end of the low-pass filter 102 is connected to the microprocessor 104 through the frequency tracker 106, the AD converter 103 is connected to the microprocessor 104, the microprocessor 104 is connected to the storage unit 105, the output end of the 5G air interface timing data transmission module 107 is connected to the input end of the synchronization signal generator 108, the output end of the synchronization signal generator 108 is connected to the input end of the AD converter 103, and the 5G air interface timing data transmission module 107 is connected to the microprocessor 104. By setting up a 5G air interface timing data transmission module 107 and a synchronization signal generator 108, the power grid equipment can communicate with the 5G base station through the 5G air interface, realize the synchronous timing of the 5G base station to the PMU equipment and the data transmission function between the 5G base station and the PMU equipment. The functions of other components of the PMU equipment are the same as those of traditional PMU equipment, which will not be repeated here.

[0105] In a fourth aspect, an embodiment of the present application provides a network device, comprising: a second memory, a second processor, and a computer program stored in the second memory and executable on the second processor, wherein when the second processor executes the program, it implements: a time synchronization method as in any embodiment of the second aspect.

[0106] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to:

[0107] The time synchronization method of the first aspect or the second aspect is executed.

[0108] In a sixth aspect, an embodiment of the present application provides a power grid communication system, including a power grid device as in the third aspect and a network device as in the fourth aspect.

[0109] In the embodiments of the present application, on the one hand, the network equipment synchronizes the time of the power grid equipment through the SIB broadcast message. The power grid equipment only needs to parse the SIB broadcast message to obtain the absolute network time for time synchronization. There is no need to perform relevant processing algorithms of wireless signals to obtain the synchronization time, which makes the timing of the power grid equipment simple and fast. On the other hand, since the power grid equipment synchronizes the time using the SIB broadcast message of the network equipment, it does not occupy the air interface resources of the wireless service of the network equipment.

[0110] Reference Fig.14 In some embodiments, the power grid communication system further includes a bearer network 203, a core network server 204, and a power grid server 205. The power grid device 201 is connected to the network device 202 via an air interface transmission link, the network device 202 is connected to the core network server 204 via the bearer network 203, and the core network server 204 is connected to the power grid server 205. The transmission of uplink data in step 1700 of the first aspect or step 2400 of the second aspect may be implemented; the transmission of downlink data in step 1800 of the first aspect or step 2500 of the second aspect may also be implemented.

[0111] The embodiment of the present application implements the data transmission service of power grid equipment through network equipment. Since wireless communication channels are used for data transmission, the cost of establishing a station and a network and the maintenance cost of the power grid are effectively reduced.

[0112] 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.

[0113] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components 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 may be implemented as hardware, or may be 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 a non-transitory medium) and a communication medium (or a 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 technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies 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.

[0114] 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 power grid equipment, comprising: Acquire an air interface message from a network device, wherein the air interface message includes a SIB broadcast message, and the SIB broadcast message encapsulates a network absolute time after the network device is synchronized with a clock source; Parsing the SIB broadcast message to obtain network absolute time; The local time is synchronized according to the network absolute time.

2. The method according to claim 1, characterized in that Also includes: Obtain air interface transmission link delay information from network devices; The performing local time synchronization according to the network absolute time includes: The local absolute time is obtained according to the network absolute time and the air interface transmission link delay message, and the local time synchronization is performed according to the local absolute time.

3. The method according to claim 1, characterized in that Before acquiring the air interface message from the network device, the method further includes: Obtain PSS signals and SSS signals from network devices; Phase synchronization and frequency synchronization between the power grid device and the network device are achieved according to the PSS signal and the SSS signal.

4. The method according to any one of claims 1 to 3, characterized in that: Also includes: The uplink data is transmitted to the network device through the air interface transmission link, so that the network device uploads the uplink data to the power grid server through the communication network.

5. The method according to any one of claims 1 to 3, characterized in that: Also includes: Downlink data from a network device is received via an air interface transmission link, wherein the downlink data is transmitted from a power grid server to the network device via a communication network.

6. The method according to any one of claims 1 to 3, characterized in that: The power grid equipment includes any one of the following: a phase measurement unit, a measurement and control device, and an event sequence recording device.

7. A time synchronization method, applied to a network device, comprising: Send an air interface message with network absolute time to a power grid device so that the power grid device executes the time synchronization method as described in any one of claims 1 to 6, wherein the air interface message includes a SIB broadcast message, and the network absolute time is encapsulated in the SIB broadcast message.

8. A power grid device, comprising: A first memory, a first processor, and a computer program stored in the first memory and executable on the first processor, wherein when the first processor executes the program, the following is achieved: A time synchronization method as claimed in any one of claims 1 to 6.

9. A network device comprising: A second memory, a second processor, and a computer program stored in the second memory and executable on the second processor, wherein when the second processor executes the program, the following is achieved: A time synchronization method as claimed in claim 7.

10. A computer-readable storage medium storing computer-executable instructions for: Execute the time synchronization method described in any one of claims 1 to 6; or, Execute the time synchronization method described in claim 7.

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