Análise e comparação entre diferentes métodos de controle e topologias de conversores para o aprimoramento da qualidade de energia de sistemas eólicos na configuração DFIG

Abstract

Among all the wind systems topologies, the DFIG is the one with the largest market share, in the wind industry, due to its technical advantages such as the low cost and efficiency. However, this topology presents a serious drawback when it comes to power quality, since its stator is directly connected to the grid. Depending on the grid voltage profile, some different power quality issues might appear. In this work, different control methods and converter topologies are presented and analyzed. These methods and topologies aim at overcoming the power quality issues that appear when the generator’s terminal voltage is distorted and unbalanced. Linear mathematical models are presented, for each analyzed topology, in order to make possible the controllers’ design. One of the proposed topologies presents the potential of overcoming the others, making possible to obtain a higher enhancement of the DFIG power quality. An experimental test bench was built and experimental results were presented, in order to validate the mentioned topology.