文章摘要
韩国政.利用工频电压信号的配电终端时钟同步方法[J].电力系统自动化. DOI: 10.7500/AEPS20181127005.
Han Guozheng.Clock Synchronization Method of FTU Using Power Frequency Voltage Signal[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20181127005.
利用工频电压信号的配电终端时钟同步方法
Clock Synchronization Method of FTU Using Power Frequency Voltage Signal
DOI:10.7500/AEPS20181127005
关键词: 时钟同步  配电终端  配电自动化  馈线自动化
KeyWords: clock synchronization  feeder terminal unit  distribution automation  feeder automation
上网日期:2019-11-06
基金项目:
作者单位E-mail
韩国政 齐鲁工业大学电气工程与自动化学院 han_guozheng@163.com 
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的同相别的工频电压信号的相位相差不大(小于9°)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(如0°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,在发送到接收的时延小于20ms(1个周波)的情况下,利用电压信号参考量的对时方法,时钟误差小于1ms。
Abstract:
      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 (less than 9°), a clock synchronization method using phase angle of power frequency voltage as reference is proposed. The phase angle (such as 0° phase) for the clock synchronization command sending is specified by the distribution terminals. 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 show that the clock error is less than 1ms when the round-trip delay time is less than 20 ms (1 cycle).
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