Vehicular Wiring Harness Modeling for Sub-Transient System Simulations Up to 150 KHz

The availability of accurate electrical simulation models is crucial for the development of modern vehicular power systems. Increasing power demands and strict requirements for a reliable power supply of safety-critical components have reinforced the need for such models. This work aims to derive a mathematical representation of the vehicular low voltage wiring harness for sub-transient simulations up to 150 kHz. The proposed methodology leverages 3D descriptions of the wiring harness and car body to derive impedance parameters using Finite Element Method (FEM) simulations. This approach accounts for the local positioning of conductors, capturing their mutual inductance. Compared to a simpler modeling approach, the proposed method improves precision in highly dynamic scenarios. Simulation results and experimental verification on a test bench demonstrate that neglecting mutual inductances and geometric wire positioning can lead to voltage errors of up to 20%, which are eliminated using the proposed technique. The findings of the present work underscore the significance of the inclusion of mutual inductances in the lumped parameter model of wiring harnesses for sub-transient power system simulations.