A Photovoltaic-based Improved Excitation Control Strategy of Three-phase Self-excited Induction Generator Suitable for Wind Power Generation

Abstract—Self-excited induction generators are extensively used for wind power generation in remote and grid-isolated areas. It is challenging to maintain constant voltage and frequency under variable loads and variable wind speed conditions for such kinds of generators. This article proposes a hybrid reactive power control technique for induction generators through a fixed capacitor bank connected at the stator terminals and a strategically switched inverter source. The inverter's DC bus is connected to a photovoltaic panel and a storage battery. This scheme provides stable voltage output with changing loads and widely varying wind speeds. The capacitor provides the bulk excitation current for the induction generator, while the inverter provides the additional reactive current desired to regulate the generator output voltage under variable wind speeds and variable loads. Suitable simulations and experiments validate the proposed concept.