This paper presents the simulation and harmonic analysis of impedance source inverter and multi level inverter for variable speed wind driven renewable energy conversion system. The output voltage of wind driven self – excited induction generator (SEIG) is depending on the wind velocity fluctuations, self excitation capacitance value and load variations. The minimum and maximum values of the excitation capacitor banks to satisfies the reactive power burden requirements. The improved power electronic converters like impedance source inverter and multi level inverter are interface with the wind driven self – excited induction generator (SEIG). By controlling the shoot through state or boost factor of impedance source inverter (ZSI), the variable magnitude, variable frequency voltage of the induction generator can be controlled. The comparative analysis of this two inverters are discussed.

Keywords: Self – Excited Induction Generator (SEIG), Wind Turbine, Impedance Source Inverter (ZSI), Multi Level Inverter (MLI).