Measuring outage resilience in a distribution system with the number of outages in large events
This provides a practical tool for utilities to track and improve grid resilience against hazards, though it is incremental as it builds on existing outage data methods.
The authors tackled the problem of measuring power grid resilience to extreme events by developing LENORI, an index based on forced line outages, which quantifies distribution system strength with statistical accuracy ensured by logarithmic transformation.
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.