智能变电站网络采样同步新技术

Network sampling synchronization method for smart substation

对智能变电站数字采样技术发展过程中的各种技术路线和方案进行了探讨,阐述了数字采样同步的原理及运用方法,并分析了现有各种网络采样方法存在的问题。提出了基于锁相环原理的采样值到达时刻预测技术,当原有组网采样模式丢失同步时钟后导致采样无法同步时,可以继续保持采样同步;还可以过滤交换机延时出现异常的突变,避免造成闭锁继电保护等不利影响。所提技术提高了网络传输采样值的可靠性,为网络采样在智能变电站推广应用提供了理论依据和解决方案。

The technical routes and methods of digital sampling technology during its development for smart substation are discussed. The principle and application of digital sampling synchronization are described and the problems of existing network sampling methods are analyzed. A technology of sample arrival time prediction based on PLL（Phase Locked Loop） is proposed,which,when the synch clock is lost,can continue the sampling synchronization to avoid the synch failure occurred in normal network sampling methods; and it can also filter the abnormality caused by the switch delay to avoid the unfavourable influences,such as the relay protection blocking. The proposed technology can improve the sample reliability of network transmission and provide the theoretic basis and solution for the popularization and application of network sampling in smart substation.