基于物理层时间捕获的GIS局部放电无线监测系统时间同步方案研究  

Research on the Time Synchronization Method of GIS Partial Discharge Wireless Monitoring System Based on Physical Layer Time Capturing

作　　者：吴夕楠 陈洪涛 李立学[1] 郑益慧[1] 赵建明 王昕[1] WU Xinan;CHEN Hongtao;LI Lixue;ZHENG Yihui;ZHAO Jianming;WANG Xin(Center of Electrical ＆ Electronic Technology, Shanghai Jiao Tong University, Shanghai 200240, China;Songyuan Power Supply Company, Jilin Electric Power Co., Ltd., Jilin Songyuan 138000, China)

机构地区：[1]上海交通大学电工与电子技术中心,上海200240 [2]国网吉林省电力有限公司松原供电公司,吉林松原138000

出　　处：《高压电器》2018年第4期54-59,65,共7页High Voltage Apparatus

基　　金：国家自然科学基金重点项目(61533012);上海市自然科学基金(14ZR1421800);流程工业综合自动化国家重点实验室开放课题基金~~

摘　　要：在GIS局部放电无线监测系统中,时间同步是一个重要环节,而目前的无线时间同步方法在开销、能耗和精度等方面不能满足无线监测系统的要求。文中首先分析了影响无线网络时间同步精度的各项不确定性延迟,为此,引入了物理层时间捕获技术,在此基础上提出了一种新的时间同步方案。然后,基于CC2530芯片和TCXO温补晶振搭建了硬件实验平台,并对其进行了电磁抗干扰分析。最后,通过实验确定了时间捕获的响应延迟为4μs,据此对同步进行修正后,得到了文中方案单次同步带来的误差为亚纳秒级,同步精度随时间的漂移约为1×10^(-6)。通过理论分析和实验验证,该方案完全满足无线监测系统的时间精度要求,可以灵活应用于无线监测系统。In GIS partial discharge wireless monitoring system, time synchronization is an important segment. How- ever, current synchronization methods cannot satisfy the requirement of wireless system in several ways. In this arti- cle, the uncertain delays in wireless system are eliminated and a new synchronization method is proposed based on physical layer time capturing. Then an experiment platform is built based on CC2530 and TCXO and electromagnetic interference is analyzed. Finally, capturing delay is confirmed to 4 microseconds. After the synchronization is cor- rected, the result is obtained： the single-synchronization error is sub-nanosecond and the accumulated drift in path with time is about 1×10^-6. With theoretical analysis and experiment, the method in this article satisfies the time accu- racy requirement and can be applied in wireless monitoring system flexibly.

关 键 词：GIS局部放电 无线监测 时间同步 物理层时间捕获 CC2530 TCXO 

分 类 号：TM855[电气工程—高电压与绝缘技术]