摘要
为实现时间同步装置高稳定输出,针对多时源选择、守时算法、动态调整这3个关键环节提出了方法及实现步骤。在多时源选择方面,提出基于聚类算法的外部独立时源选择策略,对关联时源的品质输出进行了分析;在守时算法方面,提出了基于余数动态分摊的自适应精确守时算法,并分析了晶振参数对守时精度的影响;在动态调整方面,提出了基于硬件实现的频率与相位实时跟踪方法,当外部时源与本地时源相差较大时,本地时源频率与相位以小步长匀速逼近外部时源,并趋于稳定。试验证实,所提方法在守时精度与相位和频率动态调整方面取得了较好的效果,实现了时间的高稳定性输出。
In order to achieve the high-stability output of time synchronization device,methods and implementation procedures are proposed with regard to multi-time source selection,timekeeping algorithm and dynamic adjustment.With respect to multitime source selection,an external independent time source selection strategy based on the clustering algorithm is proposed.An analysis is made on the output quality of associated time source while for the timekeeping algorithm,the adaptive accurate timekeeping algorithm based on remainder dynamic allocation is proposed.And the influences of crystal oscillator parameters on the timekeeping precision are analyzed.In terms of dynamic adjustment,the frequency and phase real-time tracking method based on hardware implementation is proposed.When obvious differences exist between external and local time sources,the frequency and phase of local time source approach the external time source in small steps at a constant speed and tend to be stable.Tests show that good effects can be obtained using the proposed method in achieving timekeeping precision and dynamic adjustment of phase and frequency of high-stability time output.
出处
《电力系统自动化》
EI
CSCD
北大核心
2017年第12期200-205,共6页
Automation of Electric Power Systems
关键词
多源选择策略
余数动态分摊
自适应精确守时
脉冲稳定输出
相位与频率动态调整
multi-source selection strategy
remainder dynamic allocation
adaptive accurate timekeeping
stable pulse output
dynamic adjustment of phase and frequency
