Transient Modeling and Analysis of Short-Circuit Faults in the DC Power System for Hybrid Electric Aircraft

Transient modeling of short-circuit faults in the DC power system of hybrid electric aircraft (HEA) serves as a fundamental basis for effective fault identification, localization, and isolation. Before faults are detected and protective measures are taken, distributed sources and loads maintain their normal control strategies. However, previous studies frequently overlook the impact of these control dynamics on the transient behavior of DC power systems, leading to reduced accuracy in fault transient models. Therefore, this paper proposes a fault transient modeling method for the DC power system of HEA considering the control effects of distributed sources and loads. Firstly, the transient characteristics of all components in the system are analyzed, including generators and fan motors, batteries and DC load, and supercapacitors. Subsequently, a comprehensive fault transient model of the HEA DC power system is established. Finally, the validity of the proposed method is verified through comparison with results from a semi-physical test platform. The results demonstrate that the proposed modeling approach enhances the accuracy of transient analysis for the faulty HEA DC power systems.