Abstract
Massive integration of renewable energy sources in electrical power systems of remote islands is a subject of current interest. The increasing cost of fossil fuels, transport costs to isolated sites and environmental concerns constitute a serious drawback to the use of conventional fossil fuel plants. In a weak electrical grid, as it is typical on an island, if a large amount of conventional generation is substituted by renewable energy sources, power system safety and stability can be compromised, in the case of large grid disturbances. In this work, a model for transient stability analysis of an isolated electrical grid exclusively fed from a combination of renewable energy sources has been studied. This new generation model will be installed in El Hierro Island, in Spain. Additionally, an operation strategy to coordinate the generation units (wind, hydro) is also established. Attention is given to the assessment of inertial energy and reactive current to guarantee power system stability against large disturbances. The effectiveness of the proposed strategy is shown by means of simulation results.
Highlights
Increasing concern about environmental problems and the shortage and rising costs of fossil fuels have promoted a growing interest in massive integration of renewable energy sources in power systems
This is the case of the new electrical generation system structure that will be installed on El Hierro, in the Canary Islands, Spain
A new model for transient stability analysis has been developed for a small size isolated electrical grid supplied mainly by renewable energy sources
Summary
Increasing concern about environmental problems and the shortage and rising costs of fossil fuels have promoted a growing interest in massive integration of renewable energy sources in power systems. Important variations in frequency and voltage levels, which can affect the electric power system stability, can appear These problems are serious in small size isolated grids, and a continuous control on the instantaneous power supplied by the renewable energy sources is required [1]. This is the case of the new electrical generation system structure that will be installed on El Hierro, in the Canary Islands, Spain. The short-term goal is that this weak grid will be completely supplied by renewable energy, where a wind farm will act as the main electrical power source.
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