智能变电站过程层网络报文传输时间计算及抖动抑制方法

过程层网络是智能变电站的重要组成部分,其实时性对智能变电站的安全可靠运行具有重要意义,而报文传输时间是实时性的主要指标。在介绍过程层网络结构及通信业务的基础上,提出了一种报文传输时间计算方法,分析了报文长度、数据率等因素对过程层网络中报文传输时间的影响并进行了仿真验证。针对因竞争而造成的采样值(SV)报文传输时间抖动问题,提出了一种通过控制报文发送时序与转发条件来抑制SV报文传输时间抖动的方法,给出了该方法的实现思路,仿真表明该方法可以在确保报文实时性的同时,有效地抑制SV报文传输时间的抖动。

Calculation and jitter suppression of process level network message transmission time for smart substation

The process level network is a key part of smart substation, its real-time performance is important for the safe and reliable operation of smart substation and the message transmission time is the major index of the real-time performance. Based on the introduction of structure and communication service of process level network, a calculation method of message transmission time is proposed. The influences of packet length, data rate and other factors on the message transmission time in process level network are analyzed and verified by simulation. Aiming at the jitter of SV(Sampling Value) message transmission time caused by competition, it is proposed to suppress the jitter of SV message transmission time by controlling sending timing and forward condition of message, and the corresponding implementation method is given. The simulation shows that the proposed jitter suppression method can ensure real-time performance of message and effectively suppress the jitter of SV message transmission time.