Time synchronization method of time ring structure
The time synchronization method forms a redundant ring loop network using cesium clocks and Beidou satellites to maintain accuracy despite equipment or line failures, addressing the fault tolerance issue in traditional methods.
Patent Information
- Application Number
- CN202411282713.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2024-12-06
AI Technical Summary
Traditional time synchronization methods lack fault tolerance in the face of equipment failures or line damage, leading to potential deviations in time synchronization accuracy, which can impact ultra-high precision equipment.
A time synchronization method combining space-based and ground-based time synchronization, forming a ring loop network with redundancy, using cesium clocks and Beidou satellites, and incorporating optical fiber connections to ensure continuous time synchronization even in the event of power or line failure.
Enhances fault tolerance, maintaining time synchronization accuracy by allowing alternative paths for synchronization through interconnected devices, reducing the impact of device or line failures.
Smart Images
Figure CN119094075A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to time synchronization technology for regions at all levels, and in particular to a time synchronization method for a time ring structure. Background Art
[0002] Time is extremely important for the power grid. Unsafe timing can lead to power accidents at best and power grid paralysis at worst. In order to ensure time safety, the traditional way is to receive both GPS satellite signals and Beidou satellite signals. GPS and Beidou serve as backup for each other, ensuring the time safety of the power grid.
[0003] The traditional method sets up redundancy for single-point failure of optical cables and single-board failure of equipment, but there is no redundancy design for equipment power failure. When the equipment loses power or the ground optical fiber is broken, it may have a serious impact on the time of all subsequent equipment. Therefore, a complete time synchronization method is needed to ensure that the time synchronization accuracy is not affected even if the equipment loses power or the line is damaged, and to increase the time synchronization accuracy of the timing method. Summary of the invention
[0004] The purpose of the present invention is to provide a time synchronization method of a time ring structure, which can be used in the time synchronization of power grid equipment and solve the problem that the time synchronization accuracy is affected by equipment or line damage in traditional time synchronization.
[0005] To achieve the above object, the present invention provides the following technical methods: A time synchronization method of a time ring structure, which forms a network and completes time synchronization by combining space-based time synchronization with ground-based time synchronization, includes the following steps: a. Time synchronization is based on the atomic clock of the National Time Service Center and is synchronized to the cesium clock of the provincial company PRC through space-based Beidou and ground optical fiber; b. Using the cesium clock of the provincial company's control center as the benchmark, connect the cesium clocks of the timing equipment of each city site through ground optical fiber to synchronize the ground-based time; c. In addition to the direct optical fiber connection with the provincial company, the timing equipment between cities is also linked through optical fiber to form a ring loop; d. At the same time, the cesium clock timing equipment of the municipal company is connected to the Beidou satellite through protocol transmission to synchronize the clock, and is constantly compared and synchronized with the clock obtained from the provincial company; e. Using the municipal company's cesium clock as a benchmark, link each county (district) level company in the same way, and network between the county (district) companies to form a ring loop, while connecting to the space-based BeiDou satellite.
[0006] Furthermore, the timing equipment is connected to the National Timing Center via wired connection and to the Beidou satellite via wireless connection.
[0007] Furthermore, the ring loop interconnects the timing devices of the same level to form redundancy in case of power failure. When any of the devices fails, ground-based time synchronization can also be obtained through other linked timing devices.
[0008] Furthermore, terrestrial fiber optic links, where the end-to-end cable route length exceeds 120km, require additional relay stations.
[0009] After adopting the above technical method, the present invention has the following beneficial effects: The fault tolerance of the time synchronization method is increased so that the time synchronization accuracy is not affected even if the device loses power or the line is damaged, and the time synchronization accuracy of the timing method is increased. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a system structure diagram of the time synchronization method of the time ring structure of the present application; DETAILED DESCRIPTION
[0011] In order to more clearly understand the purpose, technical methods and advantages of the present application, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments.
[0012] A time synchronization method of a time ring structure, which forms a network and completes time synchronization by combining space-based time synchronization with ground-based time synchronization, includes the following steps: a. Time synchronization is based on the atomic clock of the National Time Service Center and is synchronized to the cesium clock of the provincial company PRC through space-based Beidou and ground optical fiber; b. Using the cesium clock of the provincial company's control center as the benchmark, connect the cesium clocks of the timing equipment of each city site through ground optical fiber to synchronize the ground-based time; c. In addition to the direct optical fiber connection with the provincial company, the timing equipment between cities is also linked through optical fiber to form a ring loop; d. At the same time, the cesium clock timing equipment of the municipal company is connected to the Beidou satellite through protocol transmission to synchronize the clock, and is constantly compared and synchronized with the clock obtained from the provincial company; e. Using the municipal company's cesium clock as a benchmark, link each county (district) level company in the same way, and network between the county (district) companies to form a ring loop, while connecting to the space-based BeiDou satellite.
[0013] Furthermore, the timing equipment is connected to the National Timing Center via wired connection and to the Beidou satellite via wireless connection.
[0014] Furthermore, the ring loop interconnects the timing devices of the same level to form redundancy in case of power failure. When any of the devices fails, ground-based time synchronization can also be obtained through other linked timing devices.
[0015] Furthermore, terrestrial fiber optic links, where the end-to-end cable route length exceeds 120km, require additional relay stations.
[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical methods in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The embodiments are as follows: Although conventional traditional time synchronization methods have backup lines, they still lack fault tolerance in the face of some natural disasters, equipment failures, line failures, etc., which can easily cause slight deviations in the back-end timing equipment, which has a huge impact on some ultra-high precision equipment.
[0017] By combining the ground-based time synchronization ring loop with the space-based Beidou satellite synchronous measurement, the fault tolerance rate of time synchronization can be greatly increased. Even if one of the communication lines or equipment fails, the ground-based time synchronization can be completed through the paths of other ring loops. Only when multiple different faults occur in the entire ring loop will a time synchronization error be caused.
[0018] As shown in the figure: In the traditional method, if the equipment in County A, which is under the jurisdiction of City D, is damaged, the other equipment in the entire County A will only rely on Beidou satellites for time calibration, and will lose the ground-based timing comparison, which will cause the time deviation to exceed the required requirements.
[0019] If the following ring timing method is used, even if the equipment in County A in City D fails, time synchronization can still be completed through the ground-based optical fiber in County B and County D in the ring loop, so that the high-precision equipment under County A can still compare the time synchronization with the space-based Beidou wireless through the ground-based optical fiber timing.
Claims
1. A time synchronization method for a time ring structure, characterized in that The network is built and time synchronization is completed by combining space-based time synchronization and ground-based time synchronization, including the following steps: a. Time synchronization is based on the atomic clock of the National Time Service Center and is synchronized to the cesium clock of the provincial company PRC through space-based Beidou and ground-based optical fiber; b. Using the cesium clock of the provincial company's control center as the benchmark, connect the cesium clocks of the timing equipment of each city site through ground optical fiber to synchronize the ground-based time; c. In addition to the direct optical fiber connection with the provincial company, the timing equipment between cities is also linked through optical fiber to form a ring loop; d. At the same time, the cesium clock timing equipment of the municipal company is connected to the Beidou satellite through protocol transmission to synchronize the clock, and is constantly compared and synchronized with the clock obtained from the provincial company; e. Using the municipal company's cesium clock as a benchmark, the synchronized time of each county (district) level company is linked in the same way, and a ring loop is formed by networking between the county (district) companies, while connecting to the space-based BeiDou satellite.
2. The time synchronization method of a time ring structure according to claim 1, characterized in that: The timing equipment is connected to the National Timing Center via optical fiber and is wirelessly connected to the Beidou satellite.
3. The time synchronization method of a time ring structure according to claim 1, characterized in that: The ring loop interconnects timing devices of the same level to form redundancy in case of power failure. When any device fails, ground-based time synchronization can be obtained through other linked timing devices.
4. The time synchronization method of a time ring structure according to claim 1, characterized in that: The ground-based optical fiber link, where the end-to-end optical cable route length exceeds 120km, requires additional relay stations.