一种基于EPON的时钟同步协议在配网多端 差动保护中的研究及应用

配网线路分支线路多、拓扑复杂,将传统差动保护用于配网线路时存在投资成本大、管理复杂的缺点。在基于EPON的配网自动化系统中,如借用EPON通道实现配网线路的多端纵联差动保护,可解决上述问题,但其采样值同步是一个难点。针对EPON通信的固有特点,设计了一种类似于IEEE 1588的时钟同步协议,该协议简化了IEEE 1588主从时钟的交互机制,可使网络内各设备的时钟与主设备同步,精度能满足配网线路多端差动保护的要求。经试验验证,该方法可解决EPON通信条件下的设备时钟同步问题。

Research and application of EPON based clock synchronization protocol in the multi-terminal differential protection of distribution line

The distribution line possesses many branch lines and complex topological structure, so applying the traditional differential protection to distribution line will cause big investment cost and complex management. The distribution automation system based on EPON will overcome these shortcomings by using EPON channel to realize the multi-terminal differential protection, but the sampling value synchronization is a difficult point. Aiming at communication features of EPON, this paper introduces a clock synchronization protocol similar to IEEE 1588. It simplifies the interaction mechanism of IEEE 1588 master-slave clock, and realizes the clock synchronization between the main device and slaves. The accuracy can meet the demand of distribution line multi-terminal differential protection. Tests show the proposed method can solve the problem of clock synchronization under the EPON communication.