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Resilience is emerging as an evolving notion, reflecting a system's abilityto endure and adapt to sudden and catastrophic changes and disruptions. Thispaper spotlights the significance of the quantitative resilience indices ofmedium-voltage DC (MVDC) distribution technology in marine vessels, notablynaval ships. Given the intricate electrical requirements of modern naval ships,the need for a robust power supply underlines the imperative of resilient DCmicrogrids. Addressing this, our study introduces a novel quantitative metricfor operational resilience of DC microgrids based on the measured voltage ofmain DC bus. This metric not only fuses real-time tracking, compatibility, andcomputational efficiency, but also adeptly monitors multiple event phases basedon time-domain analysis of dc bus voltage dynamics. The intricacies of the dcbus voltage, including overshoots and undershoots, are meticulously accountedfor in the algorithm design. With respect to existing research that typicallyfocuses on offline resilience assessments, the proposed index provides valuablereal-time information for microgrid operators and identifies whether microgridresilience is deteriorating over time.

Time-Domain Operational Metrics for Real-time Resilience Assessment in DC Microgrids