Hot-standby communication of VLAN-based smart substation

The real-time performance and security of process-level network communication in smart substation can be improved by the application of VLAN(Virtual Local Area Network) technology. A scheme of dual-switch communication with HSRP (Hot-Standby Router Protocol) is designed for the multi-switch communication to reduce the communication load of central switch and its mesh topology is compared with the star topology of single-switch communication in simulation and experiment, which show that, the central switch load of process-level network in the proposed scheme is obviously reduced and the standby switch can take over the corresponding data communication task when fault occurs in the link, which improves the reliability of smart substation communication network.