A simple model based control of self excited induction generators over a wide speed range∗

Self excited induction generators (SEIG) are widely used to harness energy from wind power. However, maintaining constant voltage output from SEIG with varying loads and wind speeds is still a major challenge. This paper proposes a control scheme which provides stable voltage output with changing loads and widely varying wind speeds. A capacitor is employed to provide the bulk excitation for the induction generator. An inverter with a photovoltaic (PV) module supplies the variable reactive current needed to regulate the generator output voltage under variable wind speeds and variable loads. Appropriate simulations and experiments with a laboratory prototype validate the proposed model.