Research on Global Deterministic Direct Forwarding and Scheduling of Mixed Flow Based on Time-Sensitive Network in Substation

Abstract

Time-sensitive networks enable the high-quality mixed transmission of various types of business flows. However, the Time-Aware Scheduler mechanism fails to address the issue of interference in data flows with the same priority. This paper conducts an in-depth analysis of the store-and-forward mechanism in switches, combining it with the characteristics of critical GOOSE and SV-type flows in substations. By introducing methods such as setting offsets and allocating redundant time slots to the data flow of the transmitter in the TAS scheduling mechanism, all factors that cause conflicting interference to the data flow transmission in the TSN network are solved, and the uncertain queuing delay is eliminated. The proposed scheduling algorithm, compared to the TAS scheduling algorithm of the FIFO rule, achieves a maximum reduction of 34.35% in the transmission delay of critical business flows, while the jitter is controlled below 10 μs. Compared to the strict priority algorithm, it reduces the transmission delay by 40.26% while maintaining the standard deviation of delay within 1.59%. The maximum transmission delay and the minimum transmission delay of the data flow scheduled in this paper are between the theoretical boundary values without queuing delay, which satisfies the deterministic transmission of critical business flows under high load conditions, and provides support for future substation integrated networking and high load applications.