Enhanced dynamic performance of DC microgrids in more electric aircraft via hybrid energy storage system

The Hybrid Energy Storage System (HESS), typically configured with battery-supercapacitor integration, demonstrates significant potential for mitigating DC bus voltage ripples caused by abrupt load variations. However, in More Electric Aircraft (MEA) applications, conventional Filter Frequency Division (FFD) approaches exhibit fundamental limitations in dynamic response characteristics. This is particularly evident when serving pulsed loads, resulting in undesirable DC bus voltage recovery times. To address this issue, an enhanced second-order FFD architecture is proposed. This architecture is systematically reconstructed through a novel negative impedance compensation technique, specifically designed to account for both power source and HESS impedance characteristics. The proposed methodology fundamentally modifies the output impedance of the DC source-HESS integrated system. This achieves synergistic power stage-control strategy integration, substantially improving DC bus voltage transient recovery performance. Comprehensive simulation studies validate the control scheme in various operational scenarios. Experimental validation on a 10 kW HESS prototype conclusively demonstrates the technical feasibility and performance enhancement of the proposed control.