Frequency stability assessment of deloaded wind turbines in Spanish island power systems

D. Fuente Pascual, M. Rajabdorri, E. Lobato, L. Sigrist

4th International Conference on Smart Grid and Renewable Energy - SGRE 2024, Dawhah (Qatar). 08-10 enero 2024

Summary:

This paper investigates under what circumstances the provision of frequency regulation by renewable energy sources can provide technical and economic benefits to real island power systems. In order to do so, the unit commitment problem is simulated, and the frequency stability is analyzed in terms of frequency deviations and the amount of shed load when the wind turbine generator operates at a fixed and variable deloading percentage under normal conditions. The assessment is carried out for La Palma (small size) and Tenerife (medium size) island power systems by considering different wind source availability scenarios for sample weeks of different seasons in current and future years. Results show that in high wind penetration scenarios, considering a fixed deloading ratio to provide both inertia and reserve, improves the total system operating costs and the overall frequency response quality which translates into a lower under-frequency load shedding cost. A variable deloading factor, although leading to lower system operational costs, falls short of ensuring a reliable frequency response in certain scenarios after outages.

Spanish layman's summary:

Este estudio explora el impacto de los aerogeneradores en los sistemas de energía de islas. Al simular La Palma y Tenerife, compara la descarga fija y variable. El viento fuerte con descarga fija reduce costos y mejora la respuesta. La descarga variable, aunque rentable, podría comprometer la confiabilidad en cortes de energía.

English layman's summary:

This study explores wind turbines' impact on island power systems. Simulating La Palma and Tenerife, it compares fixed and variable deloading. High wind with fixed deloading cuts costs and boosts response. However, variable deloading, while cost-effective, may compromise reliability in outages.

Keywords: Deloading of renewable generation, frequency dynamics, unit commitment, system frequency response model.

Publication date: January 2024.

Citation:
Fuente Pascual, D., Rajabdorri, M., Lobato, E., Sigrist, L., Frequency stability assessment of deloaded wind turbines in Spanish island power systems, 4th International Conference on Smart Grid and Renewable Energy - SGRE 2024, Dawhah (Qatar). 08-10 January 2024.

IIT-24-005C