基于链路层交换节点的数字化变电站通信网络构架研究

A study on the communication network structure of digitized substation based on link layer switch node

为了增强数字化变电站报文传输的实时性和可靠性,使数字化变电站通信网络具有更高的强壮性以应对突发流量的冲击,研究了基于交换节点的数字化变电站通信网络构架。针对数字化变电站内传输的大量报文是不经传输层和网络层,直接从应用层映射到链路层进行传输的特点,提出了链路层交换节点的概念,组建了由接入网交换节点和传输网交换节点构成的传输网络,设计了链路层交换节点交换机的转发逻辑和所需维护的MAC地址映射表,并设计了配合链路层交换节点的组成逻辑信道的物理信道的选取原则。结合数字化变电站通信需求和设备分布,给出了基于链路层交换节点的数字化变电站通信整体网络构架方案。通过与传统链路层协议下网络构架的比较,指出了基于链路层交换节点的网络构架的优势。

The communication network structure for digital substation based on switch node is researched, to improve the reliability of real-time message transfer and to strengthen the communication network of digitized substation in case of the impact by sudden data flow. Considering the characteristic that most messages in digitized substations are directly mapped from application layer to link layer without passing through transfer layer and network layer,this paper defines link layer switch node and constructs the communication network which consists of access switch nodes and transfer switch nodes.The transfer logic of the exchanger of link layer switch node and the MAC address mapping table needed to maintain are designed.The selection rules of physical path composing logical signal path to match up link layer switch node are also designed.The whole network structure scheme for digital substation based on link layer switch node is proposed,considering the demands of substation communication and distribution of physical devices.The superiority of network structure based on link layer switch node over that under traditional link layer protocols is shown by comparison.