Voltage control of PWM-VSI Assisted Standalone Self Excited Induction Generator

摘要

In remote areas, to produce electricity from wind energy Self Excited Induction Generators (SEIG) are extensively used. This paper presents simulation and experimental results of a Stand Alone SEIG and its terminal voltage control. The system consists of a constant voltage controller, Sine Pulse-Width modulated voltage source inverter(PWM-VSI)and a battery for initial excitation. With the help of a closed loop control strategy, dc capacitor voltage is maintained constant inspite of changes in load. Thus Induction Generator can be operated at constant terminal voltage from no-load to full-load. Mathematical modelling of Self Excited Induction Generator feeding a RL load and driven by a wind turbine are developed in MATLAB/Simulink. Aforementioned system has been implemented experimentally using necessary hardware, 3.7 kW induction machine and control strategy has been implemented using TIs F28069M DSP processor. Both simulation and experimental results are discussed for varying load conditions.