摘要
配电自动化中常用的时钟同步协议如简单网络时间协议等,由于时钟同步命令往返时间的不一致,造成了时钟同步误差较大。利用同一配电线路上同相别的工频电压信号相位相差不大的特点,提出了一种利用工频电压信号的相位作为对时参考量的对时方法。进行对时的配电终端事先约定对时命令发送时对应的工频电压相位。发送端在电压到达约定相位时发送对时命令,接收端收到对时命令后,将前一个电压处于约定相位的时刻标记为参考接收时刻。通过相同约定相位的标记避免了对时命令往返的不一致造成的误差。理论分析和实验验证结果表明,在发送到接收的时延小于20 ms的情况下,利用电压信号参考量的对时方法,时钟误差小于1 ms。
Clock synchronization protocols that are commonly used in distribution automation, such as simple network time protocol, have a large synchronization error due to inconsistent round-trip time of clock synchronization commands. Based on the fact that the phase angle difference of the same phase power frequency voltage signal on the same distribution line is very small, a clock synchronization method using the phase angle of power frequency voltage as the time reference is proposed. The feeder terminal unit for clock synchronization should agree in advance the corresponding power frequency voltage phase when the clock synchronization command is sent. The sender sends the timing command when the voltage reaches the prescribed phase angle. After receiving the timing command, the receiver marks the time when the previous voltage is at the prescribed phase angle as the reference receiving time. The error caused by the inconsistencies of the command round-trip is avoided by marking the same conventional phase. Theoretical analysis and experimental verification shows that the clock error is less than 1 ms when the round-trip delay time is less than 20 ms.
作者
韩国政
李镇宇
董霞
张玮
HAN Guozheng;LI Zhenyu;DONG Xia;ZHANG Wei(School of Electrical Engineering and Automation,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2019年第24期181-186,共6页
Automation of Electric Power Systems
关键词
时钟同步
配电终端
配电自动化
馈线自动化
clock synchronization
feeder terminal unit
distribution automation
feeder automation
