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IJSTR >> Volume 6 - Issue 7, July 2017 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Amplitude Modulation Index Based Equation For Predicting Total Harmonics Distortion In Seven Level Cascaded H-Bridge Inverter

[Full Text]



Douglas T. kureve, Nentawe Y. Goshew, Samuel T. Awuhe



Alternate phase opposition disposition, cascaded H-Bridge inverter, multilevel inverter, phase disposition, phase opposition disposition, pulse width modulation, total harmonic distortion.



This research work focuses on developing an amplitude modulation index based equation that can predict the harmonic content in the conventional seven-level cascaded H-bridge multilevel inverter (CHBMLI) at low switching frequency. A logic circuit using phase opposition disposition pulse width modulation (PODPWM) scheme is used for the seven-level CHBMLI. The multilevel inverter (MLI) is simulated for amplitude modulation indices from 0.10 to 0.26.The simulated and calculated results of the harmonic content in the output voltage at amplitude modulation index of 0.20 produce minimum values of 16.61 % and 13.00 % respectively. The harmonic content from the amplitude modulation equation, on average, deviates from the simulated result by 2.74 %. Simulation results are obtained using MATLAB/SIMULINK software.



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