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Open AccessArticle

Frequency Regulation of a Hybrid Wind–Hydro Power Plant in an Isolated Power System

Department of Hydraulic, Energy and Environmental Engineering, Universidad Politécnica de Madrid, C/Profesor Aranguren, 28040 Madrid, Spain
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Energies 2018, 11(1), 239; https://doi.org/10.3390/en11010239
Received: 13 December 2017 / Revised: 11 January 2018 / Accepted: 16 January 2018 / Published: 19 January 2018
(This article belongs to the Special Issue Wind Generators Modelling and Control)
Currently, some small islands with high wind potential are trying to reduce the environmental and economic impact of fossil fuels by using renewable resources. Nevertheless, the characteristics of these renewable resources negatively affect the quality of the electrical energy, causing frequency disturbances, especially in isolated systems. In this study, the combined contribution to frequency regulation of variable speed wind turbines (VSWT) and a pump storage hydropower plant (PSHP) is analyzed. Different control strategies, using the kinetic energy stored in the VSWT, are studied: inertial, proportional, and their combination. In general, the gains of the VSWT controller for interconnected systems proposed in the literature are not adequate for isolated systems. Therefore, a methodology to adjust the controllers, based on exhaustive searches, is proposed for each of the control strategies. The control strategies and methodology have been applied to a hybrid wind–hydro power plant on El Hierro Island in the Canary archipelago. At present, in this isolated power system, frequency regulation is only provided by the PSHP and diesel generators. The improvements in the quality of frequency regulation, including the VSWT contribution, have been proven based on simulating different events related to wind speed, or variations in the power demand. View Full-Text
Keywords: wind–hydro systems; variable speed wind turbine; governor tuning; wind turbine frequency regulation; inertia emulation wind–hydro systems; variable speed wind turbine; governor tuning; wind turbine frequency regulation; inertia emulation
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Martínez-Lucas, G.; Sarasúa, J.I.; Sánchez-Fernández, J.Á. Frequency Regulation of a Hybrid Wind–Hydro Power Plant in an Isolated Power System. Energies 2018, 11, 239.

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