Small-signal Stability Analysis of Offshore DC Microgrids

摘要: DC microgrids are becoming an attractive option for offshore applications owing to their capability to incorporate various distributed energy sources. However, connecting all generating units, storage systems, and loads to DC microgrids via multiple converters can lead to system instability. DC bus voltage may fluctuate based on load changes, converter operating conditions, and controller tuning. Therefore, maintaining voltage stability over a broad limit of operations poses a significant challenge for offshore DC MGs. To address this challenge, this paper presents mathematical models of various DC microgrid components and proposes a suitable controller design to ensure system stability. The designed cascaded controller is demonstrated to successfully control the voltage on the bus while maintaining overall system stability for a small DC microgrid simulated in MATLAB/Simulink. The system's performance has …