卫星时钟与网络时钟互备的广域时间同步方法

摘要

In order to meet the demand of wide area time synchronization for the rapid development of smart grid,a new wide-area time synchronization method is proposed,in which satellite clock and network clock are mutually spare.Based on an analysis of the error characteristics of satellite clock,crystal clock and network clock,the high precision synchronous clock timing method combined with satellite clock and crystal clock is studied,and a message path delay improvement algorithm featuring IEEE 1588 protocol network dock is proposed.On this basis,a distributed autonomous wide-area time synchronization scheme focused on high-precision synchronous clock and network clock is put forward.The simulation results show that the wide-area time synchronization scheme can realize accurate and reliable time synchronization of the time nodes in the wide area network while meeting the time synchronization requirement of the smart grid.%为满足智能电网快速发展对广域时间同步的需求,提出了一种卫星时钟与网络时钟互为备用的新型广域时间同步方法.该方法基于对卫星时钟、晶振时钟和网络时钟误差特性的分析,研究了卫星时钟与晶振时钟相结合的高精度同步时钟授时方法,提出了基于IEEE 1588协议网络时钟的报文路径时延改进算法;并在此基础上提出了一种基于高精度同步时钟与网络时钟的分布自治式广域时间同步方案.仿真结果表明,该广域时间同步方案可实现广域网内各时间节点的精确、可靠时间同步,能较好地满足智能电网的时间同步需求.