A corrective frequency-constrained unit commitment with data-driven estimation of optimal UFLS in island power systems

M. Sarvarizadeh, L. Sigrist, A. Rouco, M. Rajabdorri, E. Lobato

International Journal of Electrical Power & Energy Systems Vol. 181, pp. 112154

Resumen:

This paper presents a novel corrective frequency constrained unit commitment (FCUC) formulation for island power systems by implementing data-driven constraint learning to estimate the optimal under-frequency load shedding (UFLS). The Tobit model is presented to estimate the optimal amount of UFLS using the initial rate of change of frequency. The proposed formulation enables co-optimizing operation costs and UFLS. The aim is to account for optimal UFLS occurrences during operation planning, without increasing them. This would potentially reduce system operation costs by relaxing the reserve requirement constraint. The performance of the proposed formulation has been analyzed for a Spanish island power system through various simulations. Different daily demand profiles are analyzed to demonstrate the effectiveness of the proposed formulation. Additionally, a sensitivity analysis is conducted to demonstrate the effects of changing the cost associated with UFLS. The corrective FCUC is shown to be capable of reducing system operation costs without jeopardizing the quality of the frequency response in terms of UFLS occurrence.

Resumen divulgativo:

Este artículo propone un FCUC correctivo para sistemas insulares mediante un modelo Tobit que estima el deslastre óptimo de carga por baja frecuencia (UFLS). El modelo cooptimiza los costes de operación y el UFLS, manteniendo la calidad de la respuesta de frecuencia, y se valida en un sistema insular español.

Palabras Clave: Frequency-constrained unit commitment; Data-driven; Tobit model; Frequency stability; Machine learning; Corrective

Índice de impacto JCR-JIF y cuartil WoS: 5,300 - Q1 (2025)

Referencia DOI: https://doi.org/10.1016/j.ijepes.2026.112154

Publicado en papel: Agosto 2026.

Publicado on-line: Septiembre 2026.

Cita:
M. Sarvarizadeh, L. Sigrist, A. Rouco, M. Rajabdorri, E. Lobato, "A corrective frequency-constrained unit commitment with data-driven estimation of optimal UFLS in island power systems", International Journal of Electrical Power & Energy Systems, Vol. 181, pp. 112154, Agosto 2026. [Online: Septiembre 2026] doi: 10.1016/j.ijepes.2026.112154