Operational Resilience Assessment: A Frequency-Domain Approach for DC Microgrids
CoRR(2023)
摘要
DC shipboard microgrids (SMGs) are highly dynamic systems susceptible to
failure due to various cyber-physical disturbances, such as extreme weather and
mission operations during wartime. In this paper, the real-time operational
resilience (OR) evaluation of DC SMGs against dynamic disturbances is proposed
using frequency-domain metrics. To this end, first the drawbacks of time-domain
OR evaluation using an energy imbalance index is discussed. As the time-domain
energy imbalance index is shown to be incapable of real-time OR assessment,
particularly in the context of droop-controlled DC SMGs without secondary
voltage restoration control, the $\mathcal{H}_2$ and $\mathcal{H_\infty}$ norms
of candidate transfer functions (TFs) of the system are proposed as measures of
resilience. It is shown that the proposed norms calculated for the bus
impedance TF of the system provides intuitive results in terms of energy
imbalance and can be computed in real time. The case studies conducted for the
study DC SMG under pulsed power load (PPL) disturbances demonstrate the
shortcoming of the time-domain OR evaluation and the capability of the proposed
frequency-domain metrics in intuitive OR evaluation of DC SMGs.
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