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Abstract
This article presents a single-phase 17-level hybrid multi-level inverter. The cascaded unit is made up of two five-level inverter configurations: a diode-clamped inverter and an inverter constituted of a main inverting H-bridge leg and level-clamping half-bridge circuit. The asymmetrically cascaded inverters have a separate DC input ratio of 1:3 that affects reduction in the power circuit component count in the single-phase multi-level inverter system. The operational principles, modulation schemes, and switching functions have been analyzed in detail. Fast fourier transform analysis of the output voltage waveform was carried out, and a low total harmonic distortion value of 7.61% was obtained. The validity of the proposed hybrid multi-level inverter is verified through simulation and experimental results.
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Charles Ikechukwu Odeh
Charles Ikechukwu Odeh received his B.Eng., M.Eng., and Ph.D. in electrical engineering from the Department of Electrical Engineering, University of Nigeria, Nsukka, in 2002, 2006, and 2010, respectively. He is a senior lecturer at the Department of Electrical Engineering, University of Nigeria, Nsukka. From January to September 2011, he was an exchange scholar, sponsored by the U.S. Navy, at Tennessee Technological University, Cookeville, TN, USA. Currently, he is an Alexandra Von Humboldt (AvH) fellow at E. ON Energy Research Center, Rheinisch-Westfälische Technische Hochschule, Aachen, Germany. His research interests are power electronics multi-level converter topologies and applications.