A Comparative Study on Frequency-Constrained Unit Commitment Approaches in Island Power Systems

TL;DR

This paper compares various frequency-constrained unit commitment methods in island power systems, highlighting the advantages of a data-driven corrective approach for enhancing frequency stability amid high renewable integration.

Contribution

It introduces two indices for comprehensive comparison of FCUC formulations considering system benefits and computational efficiency in island power systems.

Findings

Data-driven corrective FCUC performs best in simulations.

Frequency stability is critically affected by renewable energy penetration.

Proposed indices enable effective comparison of FCUC methods.

Abstract

The increasing penetration of renewable energy sources reduces rotating inertia and even frequency control capacity, affecting frequency stability. This challenge is significant in \gls{ips} that already suffer from low inertia and frequency control capacity. This paper presents a comparative study on different \gls{fcuc} formulations applied to \gls{ips}. Then, by considering under-frequency load shedding as a significant measure of frequency stability in \gls{ips}, two indices are presented to fully compare the formulations from system benefits and computational burden perspectives. Simulations conducted on a real Spanish island show that the data-driven corrective \gls{fcuc} formulation has the most advantages among other formulations.