摘要
通过电力线载波使接入电力系统中的物联网模块实现高精度的时钟同步对电网的稳定运行与维护具有重要意义。而传统的时钟同步方法由于同步精度低,并不适合用于电力线载波下的时钟同步。为了解决该问题,需从硬件和软件两方面着手,硬件上通过使用具有高解析度输出频率的分数型锁相环,实现对物理层时钟的高精度调节。软件上借鉴模糊控制原理,采用基于间隔的时钟同步算法,对每次接收到的时间戳进行收集分析,合理的调整时钟变量,研究分数型锁相环对设备时钟频率的调整规律,计算出最优化的时钟调整参数,实现了STA时钟与CCO时钟的快速同步,保持时钟稳定并将时钟误差控制在±0.8μs以内,显著提升了时钟精度,充分满足了物联网时钟的准确性与稳定性要求,对物联网模块在单频网络中的应用提供了技术支撑。
It is very important for single frequency network to realize high precision clock synchronization in Iot module connected to power system by power line carrier.However,the traditional clock synchronization method is not suitable for clock synchronization under power line carrier because of its low synchronization accuracy.In order to solve this problem,the hardware and software are studied.On the hardware,the high precision clock adjustment of physical layer is realized by using fractional phase-locked loop with high resolution output frequency.Software on the application of fuzzy control theory,the clock synchronization algorithm based on interval,to collect and analyze each receives the timestamp,reasonable adjust clock variables,study score type phase-locked loop to equipment clock frequency adjustment rules,to calculate the optimal clock adjustment parameters,realized the fast STA clock and CCO clock synchronization,keep the clock stable and keep the clock error within ±0.8μs,significantly improve the clock accuracy,the accuracy and stability requirements of the Iot clock are fully met.At the same time,such high-precision synchronous clock provides technical guarantee for the application of Iot module in single-frequency network.
作者
张仕奇
田恒
Zhang Shiqi;Tian Heng(School of Physics and Electronic Information Engineering.Henan Polytechnic University,Jiaozuo 454000,China)
出处
《电子测量技术》
北大核心
2022年第1期49-55,共7页
Electronic Measurement Technology
关键词
时钟同步
中央协调器
锁相环
频率偏移
clock synchronization
central coordinator
phase locked loop
frequency shift
