Desenvolvimento de modelo computacional de sistemas eólicos utilizando geradores síncronos para estudos de desempenho no contexto da qualidade da energia eletrica

Abstract

The majority of wind energy conversion systems (WECS) currently in operation in the world uses asynchronous generators for the transformation of the energy contained in the wind into electric energy. In Brazil, although small the amount of wind power stations, the existing units are mainly based on synchronous generation principles. This is in accordance with the technology named as German concept. Using this technology, the turbine operates with variable speed since the synchronization of the generation with the main grid is made through static frequency converters. Presently, the schemes using variable speed have not yet been followed by comprehensive computational simulation resources to provide means for assessment procedures and operating studies. This fact guided the subject of this thesis research topic, which directed to the development of a software destined to the modeling and studies of wind parks of variable speed taking into account aspects concerning to power quality. The technique here employed is based upon time domain representation. Therefore, a powerful tool to cope with both transient and steady state conditions is obtained. Within this context, distinct operational and real site situations of the electric utility grid at the point of common coupling are evaluated. The impacts on the power quality indexes emphasize the potentiality of the program as a tool to evaluate the connections of new wind parks to the interconnected power system.