Uma contribuição à modelagem de complexos eólicos contendo geradores especiais para atenuação das componentes harmônicas

Abstract

Most of the wind energy conversion systems (WECS) currently in operation in the world use asynchronous generators in the transformation of wind energy into electricity energy. In Brazil, although it is recognized that the parcel of wind farms is still very reduced, it is evidenced that the principle of the employed generation is mainly synchronous. Within this principle, the turbine operates with variable speed and the synchronization of the generation with the network connection is made through static frequency converters. In this particular case it is noted that the currently available resources of simulation that uses the highlighted technology here, are still scarce. Notably, the question aggravates when considering that the used generating machines do not consist in conventional synchronous units, the wind technology prioritizes the employment of special six-phase synchronous generators. This fact guided the subject of research of this dissertation, which presents a proposal for the mathematical modeling of special six-phase synchronous generators in the time domain, and aims at their application in the conversional systems of variable wind speed. Having completed their representations and their computational implementation, there follows a set of studies of the operational performance of these special machines inserted into a wind complex. Objectifying the establishment of comparisons between these generators and conventional three-phase generators, aspects such as wave forms, improvement of the harmonic distortions, better performance of the damper windings, among others, are focused and then the advantageous properties associated with the employment of these special machine are highlighted throughout this dissertation.