智能变电站过程层网络风暴的分析与处理

Analysis and Treatment of Process-Level Network Storm in Smart Substation

智能变电站过程层网络的正常运行是变电站正常运行的必要保障,网络风暴会对站内网络信息传输及相关设备造成影响,进而对变电站正常运行造成危害。根据SV报文和GOOSE报文的结构,计算其在交换机中的传输速率,对网络风暴的形成机理进行了分析,并评估了SV报文网络风暴和GOOSE报文网络风暴对站内各装置造成的影响。以某变电站中发生的一次网络风暴为例,根据网络分析仪记录的全站报文以及交换机连接关系发现网络风暴,采用断开冗余链接或故障设备的处理方法,并提出了通过报文校验、虚拟局域网技术和生成树协议避免发生网络风暴的建议。

A healthy process-level network is a necessary precondition to ensure the normal operation and function of a smart substation. Network storm has negative impacts on the information transmission and equipment in the station, consequently harming the normal operation of substation. In this paper, the transmission speeds of GOOSE packets and SV packets in smart substation network are calculated based on their different structures. The mechanism of the network storm is analyzed and the corresponding impact is also estimated. By taking a network storm in a real substation for case study, the network storm was detected by analyzing the packets in the network recorder and checking connections between switches.The solution to network storm is to disconnect the redundant connections and the failed devices. Finally, it is proposed that packages check, VLAN technology and STP protocol are measures against network storm.