时钟同步技术及其在变电站中的应用

Time synchronization and its application in substation

时钟同步对于电力系统的故障分析、监视控制及运行管理具有重要意义。为更好地应用时钟同步技术,介绍了世界上现有的时钟同步手段、变电站内常用的对时方案,具体分析了GPS对时方案的误差来源和减小误差的措施,列举了时钟同步技术在变电站内的应用,展望了变电站用时钟同步技术的发展趋势。指出GPS是主要的时钟源,将时间报文和脉冲信号相结合的综合对时方式仍是保证对时精度的有效手段;IEEE1558可能会逐步成为主要的对时手段;北斗星导航系统将可以提供另外一个可靠的时钟源;基于时钟同步技术的新的应用功能,比如同步相量测量必将进一步发展。

Time synchronization is very important for the fault analysis, supervision and control and operation management of electrical power system, To explore further application of time synchronization technology, all the available time synchronization signal sources in the world and practical time synchronization scheme in substations are introduced firstly. Then the error sources of time synchronization are analyzed and corresponding countermeasures are proposed. The application of time synchronization in various areas and its future are pointed out. It is pointed out that GPS remains as the main time resource, time message together with pulse signal is still a good solution to get high accuracy. IEEE 1588 will become the principal way to achieve high accuracy time synchronization in the future; BEIDOU satellite navigation system may provide another reliable time resource; new functions based on time synchronization, such as sync-phasor measurement will be developed furtherly.