智能变电站的时钟同步准确性及稳定性研究

针对智能变电站时钟同步存在的时钟切换、时间跳变、长期稳定性等问题开展了相应的研究工作；设计了GPS源和北斗源的无缝切换策略，提出了守时源时钟参与切换、跟踪卫星时间的逻辑判断的方法，以保证对时系统时间的连续性和稳定性；采用该对时方案，可以优化对时异常故障树和对时异常导致保护误动故障树的结构，降低系统因同步误动的概率，系统的可靠性和精确性提高明显。实际应用结果表明：所设计的方案合理可行，能有效提高同步对时系统的稳定性和可靠性。

Research on Accuracy and Stability of Smart Substation Clock Synchronization

Aiming at the existence of smart substation clock synchronization problem such as clock switching, time jump, long-term stability, these is developed appropriate research work. Design of the GPS and Beidou source switching strategy, it put forward to punctual time clock source switching, tracking satellite logic thoughts, to ensure the continuity and stability of the system time; The scheme was optimized the pair of abnormal fault tree and the pair defect in protection mis-operation fault tree structure, the probability of the whole system for synchronous operation reduces two orders of magnitude, it obviously improve the reliability and accuracy. The results show that the scheme is feasible, and effectively improve the stability and reliability of synchronous clock system.