The global energy transition has recently driven innovation in power electronics and electrification, leading to major technological progress. This thesis focuses on the DC-Link, a critical component present in the electrical powertrain, and aims to build and develop the methods to describe a model capable of capturing its behavior. The proposed study follows the analysis of the DC-Link and its constituent parts, starting from a 3D FEA of the bus bars to characterize their electrical and magnetic properties, and describing the capacitors with a circuit model that was generated from a dedicated algorithm developed to extract the model from the impedance measurements.