Investigation of Use-Case-Dependent Modeling Approach for Switched-Mode Power Converters for LVDC Grid Evaluation

Abstract:
In this paper, the methodology for creating models of power electronic converters based on a recently presented simulation approach for LVDC grids is discussed. This analysis-use-case dependent modeling approach defines three complexity levels for the component models to be used for specific evaluation cases. The theoretical basics and conventions for the three modeling levels of switched-mode converters are presented in this paper. The converter components are collated into functionally distinct subsystems to explore the modeling conventions and analytical descriptions. The parameters required to create models of buck, boost and buck-boost converters are derived and explained. Finally the model behavior for the three model levels is briefly studied and discussed. Based on this in-depth description, a detailed investigation of model accuracy and its implications on the results of the grid simulation can be carried out.