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为满足EPA网络控制系统时间同步的高精度要求,由EPA子网通讯确定性调度机制构建虚拟链路,建立基于时钟精度差的多层次主时钟选择算法。引入IEEE1588时钟变量σPTP,动态调整时钟精度偏差(CPD:Clock Precision Difference)与时间值偏差(TVD:Time Value Difference)为权重的时钟优先级(CP),建立一种二维模糊控制器确定设备时钟性能优劣层次,而系统采用公平竞争的方法从众多现场设备中快速、准确地决策一个时钟性能最好的设备作为EPA系统的最佳主时钟,保证了系统运行的稳定性,降低了本地时钟的波动,使时钟同步精度提高到50微秒。
In order to meet the high precision requirement of time synchronization of EPA network control system, a virtual link is established by the deterministic scheduling mechanism of EPA subnet communication, and a multi-level master clock selection algorithm based on poor clock accuracy is established. The IEEE1588 clock variable σPTP is introduced to dynamically adjust the Clock Precision Difference (CPD) and Time Value Difference (TVD) as the weighted clock priority (CP) to establish a two-dimensional fuzzy controller to determine the device clock Performance level and inferior level, and the system adopts the fair competition method to quickly and accurately decide the best clock quality device from many field devices as the best main clock of the EPA system to ensure the stability of the system operation and reduce the local clock Of the fluctuations, so that the clock synchronization accuracy to 50 microseconds.