Plug-N-Play Voltage Control for DC Microgrids Feeding Constant Power Loads in More Electric Aircraft

Aviation electrification has accelerated the adoption of onboard DC microgrids (DCMGs) in more electric aircraft (MEA). The dynamic integration and disconnection of renewable energy sources (RESs) are crucial for resource optimization and environmental adaptation but can induce voltage instability. This paper proposes a plug-n-play (PnP) voltage control strategy for MEAs operating under constant power loads (CPLs), ensuring voltage stability while enabling seamless RES connection and disconnection. A unified onboard DCMG model is formulated, capturing both the nonlinear behavior of CPLs and the interconnection couplings among RESs. Leveraging a structured storage function technique, sufficient conditions are derived to guarantee dissipative voltage stability at local and global levels. The proposed fully decentralized control scheme operates independently of both the number of RESs and their interconnection topology, thereby significantly enhancing the scalability for smooth plug-in/-out operations. Extensive simulations conducted across various scenarios convincingly validate the effectiveness of the proposed control strategy.