THD Minimization in Cascaded H-Bridge Inverter using Optimal Selective Harmonic Elimination
K. Venkateswararao1, G. Joga Rao2

1Mr. K Venkateswara Rao*, Pursuing MTech, Department of Power Electronics, Raghu Institute of Technology, Visakhapatnam (Andhra Pradesh), India.
2Dr. G Joga Rao, Associate Professor, Department of EEE, Raghu Institute of Technology, Visakhapatnam (Andhra Pradesh), India.

Manuscript received on May 23, 2021. | Revised Manuscript received on July 26, 2021. | Manuscript published on July 30, 2021. | PP: 170-174 | Volume-10 Issue-2, July 2021. | Retrieval Number: 100.1/ijrte.B59840710221| DOI: 10.35940/ijrte.B5984.0710221
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Abstract: Cascaded structured multilevel inverters are gaining lot of importance due to their simple structure and easiness in implementation. In this paper, the optimum selective harmonic elimination method is employed for a nine level inverter to suppress the selected lower order harmonic, which reduces the total harmonic distortion of the inverter considerably. The Newton rapson algorithm is employed in finding the switching angles that minimizes certain lower order harmonics. The order of the harmonics that are eliminated are third, fifth, and seventh harmonics. All the simulation results included for a nine level inverter using SIMULINK. Index Terms: Nine level MLI, Control of inverter, Modular Inverter. 
Keywords: THD, Optimum angles, Iterative methods.