实时修正对时服务器秒脉冲的硬件实现方法  

Hardware Implementation Method for Amending PPS of Time Synch Server in Real Time

作　　者：郑拓夫[1] 杨超[1] 闫志辉[1] 

机构地区：[1]许继集团有限公司电气技术中心,河南许昌461000

出　　处：《自动化仪表》2017年第2期89-92,共4页Process Automation Instrumentation

摘　　要：为满足新一代智能变电站技术规范的要求,使变电站安全稳定运行,并为时间同步装置提供稳定可靠的秒脉冲,提出了一种完全通过硬件实现的秒脉冲修正方法。该方法基于数字锁相环技术,对现有对时服务器的秒脉冲修正技术进行了优化。在FPGA内部以恒温晶振为激励,通过修正策略实时修正晶振分频秒脉冲的相位,使其与基准信号之间的相位差趋于零,且将每次修正的步长增量控制在纳秒级别。该方法在时间同步装置中得以应用,不但简化了现有修正方法的逻辑电路,而且提高了输出信号的精度和稳定度,可保证整个变电站系统的安全稳定运行。In order to meet the requirements of the technical specifications for new generation of smart substations, make the substations run more safe and stable,and to provide stable and reliable second pulse for time synchronization device,a hardware implementation method for amending pulse per second （ PPS ） is proposed. The method is based on digital phase locked loop technology,and optimizes the existing amending technologies for time sync server. Inside FPGA, with the thermostatic crystal oscillator as excitation,through the amending strategy,the phase of the crystal frequency division second pulse is corrected in real time,thus the phase difference from the reference signal tends to zero,and the step size of increment for each amendment is in nanosecond level. The method is applied in time synch device,it simplifies the logical circuit of existing method,and improves the accuracy and stability of output signal;this ensures safe and stable operation of the whole substation.

关 键 词：智能变电站 GPS FPGA 数字锁相环技术 秒脉冲 实时修正 恒温晶振 

分 类 号：TH86[机械工程—仪器科学与技术] TP29[机械工程—精密仪器及机械]