分布式系统内串行通信对时的设计与实现  

Design and Implementation of Serial Communication Synchronization in Distributed System

作　　者：王长清 赵天恩[1] 李彦[1] 江长青 蔡菠 何嵘 WANG Changqing;ZHAO Tian’en;LI Yan;JIANG Changqing;CAI Bo;HE Rong(NR Electric Co. ,Ltd. ,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《自动化仪表》2022年第3期88-91,95,共5页Process Automation Instrumentation

摘　　要：在电力系统领域,获取精确的事件时标以及系统内不同模块间时钟同步,均需要进行精准对时。设计了一种分布式系统内利用串行通信进行对时的架构,包括主控模块、串行通信总线和辅控模块。介绍了在分布式架构下实现对时的方法,主控模块接收外部北斗/GPS等对时源,通过串行通信总线分时复用,下发对时报文给辅控模块。对时报文包含主控模块发送报文起始时刻对应的精确时间戳。辅控模块通过捕获单元确定接收报文起始时刻。结合报文发送传输延时和辅控模块本地晶振偏差,确定辅控与主控模块时钟源的时间差,从而确定辅控模块本地时间,以完成系统内对时。系统使用一条高速串行通信总线,完成报文对时和高速数据通信,减少了布线复杂度和成本,具有较高的实用价值。In the field of power system,accurate time synchronization is required for obtaining accurate event time stamps and time synchronization between different modules in the system.A framework for time synchronization using serial communication in a distributed system is designed,including a main control module,a serial communication bus and an auxiliary control module.The method of realizing time synchronization under a distributed architecture is introduced.The main control module receives external Beidou/GPS time synchronization sources.The serial communication bus is used to achieve the purpose of time division multiplexing,and time synchronization messages is sent to the auxiliary control module.The time synchronization message contains the precise time stamp corresponding to the start time of the message sent by the main control module.The auxiliary control module determines the time of receiving the message through capture unit combined with the transmission delay of the message.The local crystal deviation of the auxiliary control module is used to determine the time difference between the clock source of the auxiliary control and the main control module,so as to determine the precise time of the auxiliary control to complete the time synchronization in the system.A high-speed serial communication bus is used to complete time synchronization and high-speed data communication in the system.The wiring complexity and cost is reduced.The high practical value is evident.

关 键 词：对时 串行通信 分布式系统 主控模块 辅控模块 分时复用 传输延时 晶振偏差 

分 类 号：TH865[机械工程—仪器科学与技术]