Plant Station Clock Synchronization Without GPS or SDH Changes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wide area system protection apparatuses face challenges in maintaining time synchronization without relying on GPS, as GPS loss disrupts system control, and SDH-based solutions are costly and impractical due to the need for specialized equipment and protocols.
Innovation Solution
A method and device for wide area time synchronization that calculates and adjusts the time phase difference and crystal oscillator frequency deviation between plant stations using data frames transmitted over an SDH 2M channel, allowing for synchronization independent of GPS, without altering the physical framework or channel configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS mode is used for time synchronization, then time synchronization can be achieved, but system control is disrupted when GPS is lost
Solution Approach 1:
The system uses its own data frame transmission and reception capabilities to perform time synchronization, eliminating dependence on external GPS systems. Each plant station sends data frames to others and calculates time phase differences based on transmitted and received timestamps, enabling self-contained synchronization.
Solution Approach 2:
Data frames serve as intermediaries carrying timestamp information between plant stations. These frames transmit sending timestamps and receive timestamps, enabling indirect time measurement without direct GPS dependency.
2Measurement precision
If SDH mode with IEEE-1588 protocol is used for time synchronization, then accurate time synchronization can be achieved, but expensive specialized equipment is required
Solution Approach 1:
The system uses existing, inexpensive data frame transmission infrastructure instead of expensive specialized SDH time synchronization equipment. The data frames already being transmitted for protection purposes are repurposed to carry timing information, eliminating the need for additional costly hardware.
Solution Approach 2:
The data frames serve dual purposes: both protection information transmission and time synchronization carrier. This multi-functionality eliminates the need for separate specialized time synchronization equipment, reducing overall system cost while maintaining precision.
3Reliability
If SDH-based IEEE-1588 system is deployed, then wide area time synchronization can be achieved, but physical framework and channel configuration must be changed
Solution Approach 1:
Existing data frame transmission channels are used for both protection information and time synchronization purposes. This eliminates the need to build separate SDH-based time synchronization channels or modify the physical framework, as the existing communication infrastructure serves multiple functions.
Solution Approach 2:
The time synchronization function is merged with the existing protection information transmission function. By combining these functions into a single data frame transmission system, the patent avoids the need for separate physical frameworks or channel configurations.
Data Source
AI summary
Provided are a synchronization method, a wide area system protection apparatus, a plant station and a computer readable storage medium. The method includes: sending to a second plant station a first data frame that includes a sequence number p and a sending timestamp of the first data frame; receiving a second data frame sent by the second plant station, and recording a receiving timestamp of the second data frame, the second data frame including a sequence number q of the second data frame, a sending timestamp of the second data frame and a receiving timestamp of the first data frame, and the first data frame being adjacent to the second frame on the second plant station; calculating a time phase difference and a crystal oscillator frequency deviation between the first plant station and the second plant station; and adjusting time and a clock frequency of the first plant station.