Measuring outage resilience in a distribution system with the number of outages in large events

TL;DR

This paper introduces LENORI, a new resilience index based on outage data during large events, providing a practical way to measure and track distribution system resilience.

Contribution

The paper develops LENORI and ALENO metrics, offering a novel, data-driven approach to quantify distribution system resilience during extreme events.

Findings

LENORI effectively measures outage resilience during large events.

The metrics can differentiate resilience levels across different hazards.

Application demonstrates practical utility in assessing power grid strength.

Abstract

We develop LENORI, a Large Event Number of Outages Resilience Index measuring distribution system resilience with the number of forced line outages observed in large extreme events. LENORI is calculated from standard utility outage data. The statistical accuracy of LENORI is ensured by taking the logarithm of the outage data. A related Average Large Event Number of Outages metric ALENO is also developed, and both metrics are applied to a distribution system to quantify the power grid strength relative to the extreme events stressing the grid. The metrics can be used to track resilience and quantify the contributions of various types of hazards to the overall resilience.