TSN-Based Flow Deterministic Transmission in Smart Substation
The existing hierarchical networking and point-to-point communication architecture of the smart substation present challenges in complex cabling and low operational efficiency.A networking solution called"network convergence"is designed for smart substations based on time-sensitive networking ( TSN) .This solution aims to achieve a unified network for the entire substation, allowing the mixed transmission of various types of smart substation messages within a single network.The smart substation communication network involves various types of traffic, and the mixed transmission of burst event messages and periodic messages with low latency requirements introduces uncertainty.To address this, the time-aware shaper function in IEEE 802.1Qbv is used to schedule all time-sensitive traffic in the network, formulate traffic scheduling constraints, and calculate configuration parameters of network device for traffic transmission.Simulation experiments are designed for two scenarios, where the scheduling parameters are configured in the TSN nodes of the simulation, so that the traffic was transmitted according to the time slot of the solution.Multiple sets of comparative experiments are conducted to examine the interference of Qbv gate-controlled scheduling and background traffic.Multiple groups of comparative experiments are 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.
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