Abstract
Self-excited induction generators (SEIG) have an inherent tendency to lose voltage at high load levels. In this paper, the magnetic characteristics and rotor impedance of the induction generator (IG) are studied to provide stable voltage regulation, without the need for external control. The magnetization characteristic is studied for a typical induction motor that is normally used as a generator. A new extrapolated magnetizing characteristic is then proposed, in which the generated voltage provides a high degree of voltage stability without changing the excitation capacitor or exceeding the generator rating. The influence of the rotor impedance and resistance values on the generator output is also studied. The generator must be operated in the saturation zone for good voltage regulation, with minimum rotor resistance of the windings. The generator variables under steady-state conditions are solved using the programming blocks of MathCAD software, thus avoiding algebraic manipulation of nth order polynomial equations required to predict the characteristics.
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