Stability Analysis of Multiple-Source DC Network in Fuel Cell-Powered Electric Aircraft

The fuel cell (FC)-powered electric aircraft (EA) is a promising architecture in the electrification of aviation. FCs, as the primary energy source, supply the thrust power to the dynamic change constant power load (CPL). Energy storage systems (ESSs) maintain the power balance in the system and regulate the dc-link voltage. In this article, the simplified multiple-source dc network is modeled. The equivalent model allows the performance of a nonlinear stability analysis to predict the system’s dynamic characteristics during load perturbations. Furthermore, a stability boundary is derived from the Jacobian matrix and eigenvalues of the system. Sensitivity analysis of key parameters, such as droop settings, dc capacitance, and line inductance is presented based on bifurcation theory. The theoretical analysis is instrumental in the design of a reliable onboard dc network. The key findings are validated by simulations and experimental tests.