The objective of this project is to build a power system training Digital Twin that could be used to train future operators. This training Digital Twin will be partly developed by the European project TWINEU (Pilot 8, covered by Task 5.5 - A power system training simulator for complex and critical situations) and be enhanced by this side project called TRAISIM. TRAISIM focuses on the acceleration of the real-time simulator embedded in the training simulator, where the simulation must operate at least as fast as the actual physical processes it replicates.