Avaliação do comportamento de um sistema de conversão de energia eólica utilizando gerador de indução duplamente excitado durante afundamentos de tensão equilibrados e desequilibrados

• Ano de defesa: 2009
• Autor(a) principal: Victor Flores Mendes
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Engenharia Elétrica; Engenharia elétrica
• Link de acesso: http://hdl.handle.net/1843/BUOS-8CKK4J

With the continuing growth of grid connected wind turbine generationsystems worldwide, including Brazil, standards have been developed considering this generation system more and more as a conventional plant. These standards define, among other requirements, that the wind turbines should remain connected to the grid during voltage sags. Some European standards require that these systems provide reactive power to grid during a voltage dip. Within this context, this thesis intends to study theoretically and experimentally the effect of voltage sags on wind conversion systems which use the doubly-fed induction generator technology (DFIG). The DFIG will be used in this study because it is the most used technology in plants and the fastest growing system worldwide. Furthermore, this is one of the most affected technologies during voltage sags. The effect of the sag on DFIG will be deduced mathematically, validating these results through a test bench that try to reproduce a real system with reduced power. The behavior of many variables will be analyzed with the system working in different conditions when submitted to balanced and unbalanced voltage sags. Based on the results, attempts to find solutions for DFIG supportability will be proposed, that is, attempts to improve the performance of the systemduring a voltage dip will be made.