智能变电站时钟同步系统中的透明时钟原理分析与实验

Analysis and Experiment of Transparent Clock in Time Synchronization System of Smart Substation

高精度的时钟同步对于保证智能变电站继电保护的正常工作具有举足轻重的作用。基于IEEE 1588v2标准的透明时钟的应用可进一步提高智能变电站时钟同步的精度。分析了基于IEEE 1588v2的透明时钟基本原理,从主时钟负载、网络拓扑变化的适应性和同步精度等方面对对等(P2P)透明时钟和端到端(E2E)透明时钟进行了比较和实验研究。结果表明,2种透明时钟均能满足智能变电站1μs的同步精度要求,但P2P透明时钟的整体性能要优于E2E透明时钟,因此建议在智能变电站中采用P2P透明时钟。

Highly accurate time synchronization plays a crucial role to guarantee the normal operation of protective relay in smart substation.The application of transparent clock in IEEE 1588 v2 may further enhance the precision of time synchronization system in smart substation.The basic principle of transparent clock based on IEEE 1588 v2 is analyzed.Peer-to-peer（P2P） transparent clock and end-to-end（E2E） transparent clock are compared and tested in three aspects of master clock load,adaptive response to network topology changing and time synchronization precision.The test result shows that both transparent clocks can meet the precision requirement of time synchronization in smart substation.In conclusion,P2P transparent clock is recommended in smart substation since its overall performance is better than that of E2E transparent clock.