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Article Published In Vol.2 (Sept-Oct-2014)

Harmonic Reduction in Induction Motor: Multilevel Inverter

Author : D. Suganyadevi, K. Rekha and M. Iswarya

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The cascaded multilevel inverter (CMLI) possesses acquired significantly consideration nowadays due to their positive aspects in substantial voltage as well as excessive power with minimal harmonics purposes. The bad quality of voltage as well as current of a traditional Inverter feasted Induction machine is on account of the availability of harmonics. This is exactly overwhelmed in multilevel inverter with significant measures which may produce premium quality voltage waveforms .The multilevel inverter output possesses diminished harmonics and also greater torque. Moreover it minimizes the heat produced in the stator winding of the induction motor. A regular cascaded multilevel inverter necessitates requires n DC suppliers for 2n+1 range at the output, exactly where n is the quantity of inverter levels. Without having to use Pulse Width Modulation (PWM) strategy, the firing circuit may be executed utilizing PWM strategies tremendously cuts down the Total Harmonic Distortion (THD) and also switching deficits. Multilevel inverter utilizing Selective Harmonic Elimination (SHE) technique can be simulated along with the respective outcomes is obtainable. The FFT spectrum for the outputs is examined to analyze the lowering of harmonics. Multilevel inverter is always to synthesize a close to sinusoidal voltage from a number of stages of dc voltages. Multilevel inverter possesses convenience like minimum amount harmonic distortion. To establish the make and model of a cascaded hybrid multilevel inverter and a demonstration is performed according to MATLAB/SIMULINK software. Their integration tends to make the model as Well as evaluation of a hybrid multilevel inverter.

Keywords: Multilevel inverter, Cascaded inverter, Digital control, Total Harmonic distortion, switching losses.

 

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