Abstract: There are many kinds of traffic in the communication network of smart substations, and there are unexpected event messages with low delay requirements. At present, smart substation adopts hierarchical networking and point-to-point communication mode for data transmission. In order to achieve the deterministic transmission of all messages in the same network, a TSN-based networking scheme for smart substation called " entire substation sharing network " is designed to realize mixed transmission of various types of smart substation messages in the same network. For the periodic and unexpected event-driven traffic in the smart substation, the time-aware shaper function in TSN 802.1Qbv is used to schedule all traffic with time-delay requirements in the network, formulate traffic scheduling constraints, and calculate configuration parameters of network device for traffic transmission. The simulation experiment is designed, and the calculated configuration parameters are configured to the TSN node in the simulation experiment, so that the traffic is transmitted according to the solved time slot. In the simulation experiment, multiple groups of comparative experiments were carried on the presence or absence of Qbv scheduling and interference from background traffic. Experiments show that the Qbv scheduling strategy can ensure the mixed transmission of multiple traffic in smart substation, and the traffic with strict delay requirements can be transmitted in the special time slot. The scheduled traffic is not interfered by the background traffic, achieving low delay and deterministic transmission of messages in the smart substation.

Key words: smart substation, Time Sensitive Networking, 802.1Qbv, flow scheduling