Use-Case-Dependent Modeling Approach for Analysis of Distributed DC Grids

Abstract

This paper investigates a generalized modeling approach for DC grid components by applying it to the simulation and analysis of a comprehensive DC grid system. The approach has been introduced in previous works, which discussed the overall objectives, scope of application and the modeling methodology for switched-mode power converters. However, a systematic validation of the system model's behavior remains outstanding. The research presented in this work addresses this gap by detailing and applying the methodology and comparing simulation results with measurements from a DC system. The findings reveal that the grid models adequately represent the system's actual behavior and render the simulation results useful for simulation-based system analysis. Discrepancies arise from an insufficient modeling of the system's damping elements. These differences however fall within acceptable error margins, especially in the context of system stability analysis. Despite the need for further verification, this paper demonstrates the approach's potential and facilitating the development of versatile component libraries and hence design tools for DC systems.

Keywords

• DC grid simulation and design
• distributed DC grids
• impedance based analysis
• power converter modeling
• short circuit analysis