Unit commitment with analytical under-frequency load-shedding constraints for island power systems

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

IEEE Access Vol. 12, pp. 72337 - 72344

Summary:

This paper presents a novel corrective frequency-constrained unit commitment (C-FCUC) for island power systems implementing analytical constraints on underfrequency load shedding (UFLS). Since UFLS is inevitable for sufficiently large disturbances, it can be argued that less spinning reserve could be held back since UFLS takes place nonetheless. Congruently, the reserve criterion should consider UFLS likely to occur under disturbances. The C-FCUC can be converted into a preventive frequency-constrained unitcommitment (P-FCUC) or a standard security-constrained unit commitment. Thus, the C-FCUC is a generalization. The proposed formulation is successfully applied to two representative Spanish island power systems of La Palma and La Gomera. Results confirm that the proposed model can reduce generation costs while reducing the expected amount of UFLS.

Spanish layman's summary:

Este artículo presenta un nuevo compromiso de unidad con restricciones de frecuencia correctiva (C-FCUC) para sistemas eléctricos insulares, incorporando restricciones de shedding de carga por subfrecuencia (UFLS). Propone un modelo generalizado y demuestra reducciones de costos en sistemas isleños españoles.

 

English layman's summary:

This paper introduces a novel corrective frequency-constrained unit commitment (C-FCUC) for island power systems, incorporating underfrequency load shedding (UFLS) constraints. It argues for less spinning reserve due to UFLS, proposes a generalized model, and demonstrates cost reductions in Spanish island systems.

Keywords: Island power system, frequency stability, unit commitment, under frequency load shedding

JCR Impact Factor and WoS quartile: 3,900 - Q2 (2022)

DOI reference: https://doi.org/10.1109/ACCESS.2024.3401854

Published on paper: 2024.

Published on-line: May 2024.

Citation:
M. Rajabdorri, A. Rouco, L. Sigrist, E. Lobato, Unit commitment with analytical under-frequency load-shedding constraints for island power systems. IEEE Access. Vol. 12, pp. 72337 - 72344, 2024. [Online: May 2024]