Constant Voltage And Frequency Of Self-Excited Induction Generator Driven By A Variable Speed Wind Turbine

Abstract

An induction generator is a type of electrical generator that is mechanically and electrically similar to an induction motor .Induction generator produce electrical power when their shaft is rotated faster than the synchronous speed of the equivalent induction motor. To excite the generator, by feed reactive power can be supplied from the grid as it used in double feed induction generator or from the external capacitor bank connected on its terminal as it used in squirrel cage (self excited induction generator) . In this thesis, control schemes for the self-excited induction generator are developed using MATLAB/SIMULINK. The mathematical model of IM is developed and capacitor excitation is determined .Two control scheme are applied one for The extracting maximum power from the wind turbine from cutin to rated wind velocity by sensing only dc link power, (boost converter). Second control strategy is developed to regulate voltage and frequency to give constant voltage-constant frequency to an isolated load. The results are obtained and discussed