Review of Power System Reliability Indices for Renewable Energy Environments

Evaluation of power system reliability is significant for power system planning and operation, especially for a power system that include many renewable power resources. Appropriate methods to estimate the reliability of generation, transmission or distribution systems can help investigate the performance of smart grid developments. Several international standards such as IEEE 1366 or IEEE 762 have been released to recommend system operators or generator owners to follow the rules. In addition, North American Electric Reliability Corporation (NERC) also defined new reliability indices, such as adequate level of reliability (ALR) metrics and others. These new reliability indices consider power system resilience. This paper will summarize the existing reliability indices for power system operation, and investigate possible resilience indices for considering severity risk. Additionally, this paper provides a future trend for resilience indices.