Dual Frequency Regulation in Pumping Mode in a Wind–Hydro Isolated System

José Ignacio Sarasúa, Guillermo Martínez-Lucas, Carlos A. Platero and José Ángel Sánchez-Fernández
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José Ignacio Sarasúa: Department of Hydraulic, Energy and Environmental Engineering, Universidad Politécnica de Madrid, C/Profesor Aranguren 3, 28040 Madrid, Spain
Guillermo Martínez-Lucas: Department of Hydraulic, Energy and Environmental Engineering, Universidad Politécnica de Madrid, C/Profesor Aranguren 3, 28040 Madrid, Spain
Carlos A. Platero: Department of Electrical Engineering, E.T.S.I. Industriales, Universidad Politécnica de Madrid, C/José Gutierrez Abascal 2, 28006 Madrid, Spain
José Ángel Sánchez-Fernández: Department of Hydraulic, Energy and Environmental Engineering, Universidad Politécnica de Madrid, C/Profesor Aranguren 3, 28040 Madrid, Spain

Energies, 2018, vol. 11, issue 11, 1-17

Abstract: Frequency control is one of the most critical tasks in isolated power systems, especially in high renewable penetration scenarios. This paper presents a new hydropower pumped-storage dual control strategy that combines variable-speed-driven pumps and fixed-speed-driven pumps. A possible case for implementation of such a control scheme is described based on El Hierro Island’s power system. This isolated power system consists of a hybrid wind pumped-storage hydropower plant and diesel generators. The pumped-storage power plant is divided into a hydropower plant equipped with four Pelton turbines and a pump station equipped with both fixed- and variable-speed pumps. According to the proposed control scheme, frequency regulation will be provided by a dual controller: a continuous controller for the variable-speed pumps and a discrete controller for the fixed-speed pumps. The Pelton units, which operate as synchronous condensers, also supply the power system inertia. Therefore, diesel units may be disconnected, decreasing generation costs and greenhouse gas emissions. Owing to the combination of both controllers and the inertia of the Pelton units, an acceptable frequency regulation can be achieved. This technique has been validated through computer simulations.

Keywords: frequency regulation; isolated system; variable-speed pump; wind penetration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (10)

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Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:11:y:2018:i:11:p:2865-:d:177603

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