A new topology was recently developed to drive generators, aiming to avoid power electronic devices directly connected to the grid, and making possible the hybridization of the wind power with other sources. The system is composed by an induction machine with rotor in squirrel cage, and a rotating armature endowed with a three-phase winding that may be fed by a secondary source. The previous purpose was to convert a variable velocity imposed by the wind turbine to the armature in a constant velocity to be developed by the cage rotor, driving a shaft of synchronous generator. This article proposes the use of an induction generator instead of a synchronous one in order to explore the maximum available wind energy (MPPT). The simulation results show that the proposed topology is viable and supports both variations in wind speed and disturbances in power grid.
Abstract. This paper presents a new system for speed control in wind turbines, the "Electromagnetic Frequency Regulator" -(EFR). One of the most used devices in some topologies to perform the speed control are boxes of mechanical gears, plus a short shelf life, often represent sources of noise and defects. The EFR eliminates the use of these gearboxes, representing a technological breakthrough, making use of a machine adapted induction, where the then known stator of the machine becomes mobile, sympathetic to the turbine shaft. The aim of this study is to evaluate through simulations, efficiency in the speed control for wind variations and reference signals. Simulations showed good results, validating the proposed.
Resumo-Um dos dispositivos mais utilizados em algumas topologias de aerogeradores são as caixas de engrenagens mecânicas que, além de uma vida útil curta representam, frequentemente, fontes de ruído e defeitos. Este trabalho apresenta um novo sistema para controle de velocidade em aerogeradores, o Regulador Eletromagnético de Frequência (REF). O REF dispensa caixas de transmissão, representa uma inovação tecnológica, e utiliza, para exercer a regulação de velocidade, uma máquina de indução adaptada, na qual o estator passa a ser girante, solidariamente ao eixo da turbina. A modelagem matemática do REF é apresentada, e, através de resultados de simulação e práticos em diferentes condições de vento, a eficiência do sistema é validada no objetivo de controlar a velocidade do eixo de saída do REF, que movimenta o eixo do gerador, à velocidade síncrona.
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