Accurate Real-Time Simulation of Converters with Frequent Current Commutation Using Sub-Step Events

Executing real-time simulations with a fixed time step presents a challenge for the calculation of discrete switching events in power electronic converters. This problem is particularly evident with DC/DC converters such as the Dual-Active Bridge (DAB) or LLC operating with wide-bandgap devices at high switching frequencies where the simulation time step is in the range of the switching period. Moreover, the currents typically commutate twice in each switching period. In this presentation a "sub-step event" approach is explained that splits the fixed simulation step into intervals delimited by switching events. The events include forced switching and natural current commutation.
Niklaus Felderer’s presentation on the Test, Measurement & Simulation-Day at Bodo’s 2022 WBG Event.
He is Team Leader Applications Engineering at Plexim.