Voltage Build-Up Behavior of Self-Excited Induction Generator Under Different Loading Conditions

This paper studies the behavior of voltage building in the self-excited induction generator (SEIG) under different loading conditions: No-load, R-Ioad, and RL-Ioad. The induction generator is operated at a constant speed that does not exceed 5 percent of the synchronous speed to achieve the working state of the generator. The value of the excitation capacitance required for the SEIG was calculated to give a suitable saturation level to assure self-excitation and to avoid heavy saturation levels. Using MATLAB / SIMULINK software the methodology of this work was adopted on 15 kW, 400V, 50Hz, 1460rpm, three-phase induction machine. The simulation results show that the generated voltage is increased with an increase in R-Ioad with a decrease in stator current, whereas decrease voltage and there is no frequency effect in the case of RL-Ioad. The results provided a good illustration about SEIG working under different loading conditions.