Estudo das características do gerador de indução duplamente alimentado aplicado a aerogeradores

Abstract

The use of renewable energy has been growing exponentially worldwide, mainly due to concern about the environmental cause and the depletion of fossil fuels. Along with the available renewable energy, wind energy appears as a relatively low cost alternative and tends to decrease further in the coming years. This work has the objective of studying a variable speed wind turbine based on the double powered induction generator. A simulation was performed in Matlab/Simulink environment with a wind turbine coupled to a DFIG with variation of the rotor resistances and a laboratory assembly of the system under study was created. The objective of the work is to demonstrate the possibility of the DFIG speed control and consequent search for the maximum power extraction from the wind turbine. The bench-top assembly uses a DC machine to emulate the wind turbine, coupled to the DFIG shaft and a rheostat connected to the generator rotor for varying rotor resistances. The results obtained through the simulation and the experimental bench are presented, being demonstrated that by varying the rotor resistances the generator speed can be varied, consequently changing the extracted power.