Power system security, reliability, restoration and resiliency

Abstract

Power system security is the ability to maintain the flow of electricity from the generators to the customers, especially under disturbed conditions. Power system reliability, restoration and resilience can all describe the power system's ability to cope with failures, but the connotations and application scenarios of the three are significantly different. Reliability refers to the ability of the power system to meet the power demand of users. Some adequacy indicators (such as expected energy not served, EENS) are usually used to describe the load satisfaction of the system in a long-time range for reliability assessment. Power system restoration refers to the operation or control procedures of restoring the power system from blackout to normal state after outages. Power system resiliency describes the ability to harden the power grid against and quickly recover from high-impact, low-frequency events. It involves the methods and strategies of prevention in advance, response during the event, and recovery after the event.