Design of Field Oriented Controller to Improve Dynamic Characteristics of Three Phase Self Excited Induction Generator

This paper presents the dynamic characteristics of the stand alone three phase-self excited induction generator (SEIG) includes loading effects on operating frequency and voltage for various transient conditions. Further to improve the dynamic characteristics of the system a field oriented controller has been proposed. Prime mover speed of the SEIG has been taken as variable speed dc motor which represent wind speed. The self excitation is mainly depending upon load speed and excitation capacitance. An inverter is connected to the stator terminals of the SEIG which manipulates the necessary excitation currents. Flux estimator estimates the rotor flux and a simple PI controller is used to estimate reference currents which further decide the switching signals in current controller for inverter. The effects of non linear magnetizing inductance have also been taken as constraint. The currents and voltage output responses of the system with and without controller has been compared, conclusions have been documented. The whole proposed system has been developed and designed using MATLAB/SIMULINK