Journal Title : International Journal of Modern Trends in Engineering and Science


Author’s Name : M Jaspin Selvi  unnamed

Volume 03 Issue 10 2016

ISSN no:  2348-3121

Page no: 24-28

Abstract – It becomes complex to connect the power semiconductor switches directly to medium and high level voltages. Hence to overcome complexities multilevel inverters came into picture and it has gained more attention in market for various applications like renewable energy systems, industrial motor drives, and etc.Multilevel Inverters produce output voltages with good quality and contains less harmonic distortion. In this paper, the single phase seven  level cascaded H-bridge inverter is modelled in MATLAB/SIMULINK. Here, alternative phase opposition disposition techniques are used to trigger the switching device used in CHMLI. The Total Harmonic Distortion (THD) is observed and reduced by varying the modulation index and frequency modulation of SPWM. The result is compared with existing harmonic cancellation method. The validity of proposed method and achievement of desired compensation are confirmed by the results of simulation in MATLAB/simulink.  

Keywords— Multilevel Inverter, Harmonic Injection, Topology, Modulation


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