Sistema de Geração Eólica Baseado em um Gerador de Indução de Rotor Bobinado com Conversor Série no Lado da Rede Elétrica sem Transformador

Abstract

This work presents the study of a system of wind generation connected to the electrical grid using Doubly Fed Induction Generator (DFIG). The proposed configuration presents the DFIG with the stator windings connected directly to the three-phase grid and connected to a serial converter, the rotor windings are fed by a AC-DC-AC converter. The series inverter is added to this topology in order to ensure a balanced three-phase sine-wave voltage to the generator terminals even if the grid voltage has some voltage sag. It is presented a comparison between the proposed and the conventional topology, which presents the use of transformer. For the development of this work, the model of the system, the model of the wind turbine and the dynamic model of the machine is presented as well. The Power Width Modulation (PWM) and control of the converters strategies are presented. Control of the reactive power, rotor speed, DC bus voltage and circulation current was performed for better system performance. Finally, simulations were performed in a computational environment, through the software PSIM ®.