Harmonics analysis in impedance Z-source inverter for wind driven self — Excited induction generator applications

The emerging need to utilize non-conventional energy sources like wind, solar, biogas. etc is focused on economic and clean environmental considerations. Wind energy is the most important source of renewable resources. The potential of wind energy is very large. It is non-polluting and safe renewable energy source compared to thermal and nuclear power generation sources. Due to intermittent and stochastic nature of wind energy, these wind energy systems are generally used with some form of energy back up to provide continuous power supply even with fluctuating available wind energy. The reactive power burden requirements of the induction generators are being satisfied by choosing the proper value of the excitation capacitor banks. By controlling the shoot through state duty cycle of impedance source inverter, the variable magnitude and variable frequency voltage of the generator can be controlled. Z-source inverter has found wide spread applications and attracted the researchers in the recent years.