This paper introduces a comprehensive set of resilience metrics tailored for DC microgrids, particularly in the context of naval applications. The proposed metrics provide real-time tracking, computational efficiency, and compatibility with various microgrid designs.
The key highlights and insights are:
The paper proposes a voltage resilience index (RV) that quantifies the microgrid's ability to retain memory from past voltage perturbations and learn from them.
A voltage vulnerability index (VVI) is introduced to evaluate the extent of voltage degradation during an event.
A voltage degradation index (VDI) is developed to capture the temporal behavior of the system's voltage performance, providing insights into the onset, duration, and termination of the degradation phase.
A voltage restoration efficiency index (VREI) is formulated to assess the microgrid's capability to rapidly recover its voltage to the desired level after a disturbance.
The proposed metrics are validated through simulation studies involving sudden load changes and generator failures in a 6 kV MVDC shipboard microgrid. The results demonstrate the effectiveness of the metrics in tracking the microgrid's resilience in real-time.
It is shown that the voltage recovery index VREI is closely related to the inertia of the DC microgrid, represented by the equivalent capacitance Ceq, and can accurately capture the microgrid's recovery speed after an event.
The comprehensive set of resilience metrics introduced in this paper provides valuable real-time information to microgrid operators, enabling them to monitor the microgrid's resilience and identify potential deterioration over time. This is a significant advancement in the field of resilience assessment for DC microgrids in naval applications.
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