Simulation of large-scale electric-ship DC-grids using the simulation tool VIAvento

Abstract

DC-ship grids are converter-dominated grids where the overall stability very strongly depends on the controls of the involved converters. Due to the non-linear structure of the control algorithms, a realistic stability assessment can only be achieved in time domain. To avoid non-realistic simulation results, a holistic model of the overall system including continuous and discrete elements and their original control algorithms has to be generated. Within this paper, the modelling approach for power-electronic devices including their non-ideal characteristics in time domain in the new simulation tool VIAvento is presented. The non-ideal characteristics are described briefly and the capability of this approach is demonstrated with simulation results of a DC grid with several independent converters in multi-level topology. Additionally, results of a resonant converter for lower power are given.