Abstract
Abstract: This paper describes the simulation andharmonics analysis of cascaded five-level H-bridge invertersfed induction motor load drive for islanding mode applications.The self – excited induction generator (SEIG) fed H-bridgeMulti-Level Inverter (MLI) for wind energy conversionsystems is chosen for several islanding mode applications. Inthis paper, the SEIG (for standalone systems) fed cascaded fivelevel inverter for induction motor load applications are clearlyexplained with the help of MATLAB / SIMULINK models. Thegenerated voltage of the wind driven SEIG is mainly dependingon the wind velocity fluctuations and appropriate loadconditions. The five level cascaded inverters have interfacewith the wind driven SEIG. By choosing appropriate value ofModulation Index (MI), the variable voltage and variablefrequency of the generator can be finely controlled. Thesimulation and harmonic analysis of the proposed inverter willbe discussed, and the total harmonic distortion of statorcurrent for different modulation index at different switchingfrequencies are evaluated and the speed and torque ofinduction motor for different load torques are plotted.Index Terms: Self – Excited Induction Generator (SEIG),Variable speed Wind Turbine, Multi Level Inverter (MLI),Induction Motor (IM), Modulation Index (MI).
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