摘要
IEEE 1588协议实现在配电网中网络测量和控制系统的时钟同步,并在基于分组的网络同步机制中起了重要作用。然而,传统的IEEE 1588同步算法的性能由于非对称链路和随机延迟问题的影响,达不到期望的精度。提出了基于IEEE 1588的时钟同步改进方案涉及到两种不同的随机延迟模型,分别服从高斯延迟模型和指数延迟模型。并分别推导出该方案中两种时间延迟模型的时钟偏移的最大似然估计值。分析结果表明,时钟偏移估计的性能依赖于随机延迟的模型和所发送的数据包大小的比率。仿真结果表明,该方案解决了非对称链路和随机延迟的问题,与传统的IEEE 1588时钟同步方法以及突发脉冲传输方案相比具有更好的性能。
IEEE 1588 is used for clock synchronization in a networked measurement and control system of the distribution grid. It plays an important role in the packet-based network synchronization mechanism. However, the performance of the conventional IEEE 1588 synchronization algorithm is affected by the asymmetric link and random delay problems. This paper proposes an improved IEEE 1588 based synchronization scheme involves two different random delay models： the Gaussian random delay model and the exponential random delay model. And the time offset and the maximum likelihood estimators of the two random delay models are derived. The results show that the clock offset estimation performance depends on the ratio of the random delay of the model and the size of the data packet transmitted. As is shown in the simulation results, the solution to the asymmetric links and random delay issue compared with the traditional IEEE 1588 clock synchronization method and burst transmission scheme obtains better performance.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2016年第9期83-89,共7页
Power System Protection and Control
基金
江苏省电力公司2015年第一批非物资(科学研究)项目(ZBXM-FW201502004)
