数字化保护装置时钟同步的实现  

Time synchronzing implementation for digital protection devices

作　　者：李志坚[1] 姜利华[1] 陈丽红[1] 李蔚[1] 嵇翔[1] 

机构地区：[1]国网电力科学研究院/南京南瑞集团公司,江苏南京210003

出　　处：《电力系统保护与控制》2011年第7期105-109,共5页Power System Protection and Control

摘　　要：系统地分析了IEC61850数字化变电站对时系统结构的主要特点和时钟误差的主要来源,提出了一种通用的时钟同步软件设计方案。该方案采用一元二次回归方程和捕捉时钟差值回填晶振计数的方法,修正外部时钟源和保护装置晶振造成的时钟误差。基于上述软件设计方案,提出了一种通用的硬件设计,能够满足各种对时网络的需求。通过工程应用例子和各种对时方式的误差测试结果,证明了本软硬件对时方案适用于数字化保护装置和其他需要高精度时钟同步的应用场合。The main feature of time synchronizing in the IEC61850 digital substation is analysed systematically, the error of clock source proved to be produced from crystal oscillator. Based on the analysis conclusion, a general software scheme of time synchronizing is presented to correct the error caused by external time source and protection device crystal oscillator using the methods of backfill crystal oscillator time＇s counter by capturing the two different trigger edge＇s time and using one-place quadratic equation of regression. Based on the mentional software scheme, a general hardware design is proposed to meet the demands of each time synchronizing nets. Engineering application and test results for various time-synchronizing error proved the mentional hardware and software are valid to the time synchronizing of digital protection devices in IEC 61850 communication and other applications of high precision time synchronizing.

关 键 词：数字化保护装置 时钟同步 IEEE 1588 IEC 61850 站控层 间隔层 过程层 

分 类 号：TM73[电气工程—电力系统及自动化] TM761