IED Time Synchronization Error Estimation
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Solution Overview
Problem
In electric power delivery systems, existing clock synchronization methods introduce errors due to unaccounted delays between time sources and Intelligent Electronic Devices (IEDs), which can lead to imprecision in clock synchronization, especially when relying on a single primary time source.
Innovation Solution
An Intelligent Electronic Device (IED) is designed with multiple time source ports, including a primary and a backup time source, where an error estimating module approximates errors in the secondary time signal, allowing seamless switching and statistical analysis of synchronization quality, thereby enhancing clock accuracy and system reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single primary time source is used for clock synchronization, then the system structure is simple, but the reliability and accuracy of time synchronization deteriorate due to single-point failures and unaccounted delays
Solution Approach 1:
The time source system is segmented into multiple independent time sources (primary and backup) instead of relying on a single time source. Each time source can be independently evaluated for accuracy, and the system can switch between them based on performance metrics, thereby improving reliability without creating a fully coupled complex system.
Solution Approach 2:
The system performs preliminary accuracy estimation and comparison of multiple time sources before actual time synchronization operations. By pre-evaluating the accuracy of backup time sources and monitoring their performance, the system can proactively switch to alternative sources before failures occur, preventing synchronization issues rather than reacting to them.
2Measurement precision
If multiple time sources are integrated with error estimation, then the clock synchronization accuracy improves, but the device complexity increases due to additional modules and processing
Solution Approach 1:
The system implements feedback mechanisms by continuously monitoring the accuracy of time sources and using this information to adjust time synchronization operations. The accuracy estimation module provides feedback about time source performance, enabling dynamic switching and compensation strategies that improve synchronization accuracy while managing complexity through intelligent control rather than brute-force redundancy.
Solution Approach 2:
The patent replaces complex mechanical or hardware-based error compensation mechanisms with software-based error estimation and calculation algorithms. By using computational methods to estimate and compensate for delays and inaccuracies, the system achieves high synchronization accuracy without requiring complex physical infrastructure or additional hardware components.
Data Source
AI summary
An intelligent electronic device incorporates a first port that accepts a time signal from a time server over a network and a second port for receiving a second time signal over a separate network. The intelligent electronic device approximates the amount of error in the second time signal based on calculations of the error in the first time signal.