A Geometric Series Based Nearest Level Modulation Scheme for Multilevel Inverter

A. Rakesh Kumar, Partha Sarathi Subudhi, Mahajan Sagar Bhaskar, Sanjeevikumar Padmanaban

Research output: Contribution to journalConference abstract in journalResearchpeer-review


Multilevel inverters are the best suitable power electronics converters over conventional two/three-level inverters to provide high power quality ac waveforms. However, the quality of the ac power highly depends on the modulation scheme employed by the multilevel inverter. The use of a low-switching frequency modulation scheme is strongly emphasized over a high-switching frequency modulation scheme because of numerous advantages such as lesser power loss, lower switching stress, improved converter efficiency and enhanced converter lifetime. This paper presents a variant of the Nearest Level Modulation scheme, which is based on the geometric nature of variation of MLI switching angles. Hence, the proposed NLM scheme is termed as Geometric-NLM (G-NLM). A seven-level symmetric CCS-MLI topology is taken for the case study, and the proposed modulation scheme is implemented on it. Matlab/Simulink is used to carry out the simulation, and the results are presented. The G-NLM is found to have reduced the voltage THD and improved other MLI parameters compared to the conventional NLM scheme.
Original languageUndefined/Unknown
JournalProceedings of the Annual Conference of the IEEE Industrial Electronics Society
Pages (from-to)3138-3142
Publication statusPublished - 2020
EventIECON 2020 - 46th Annual Conference of the IEEE Industrial Electronics Society - Online
Duration: 18 Oct 202021 Oct 2020


ConferenceIECON 2020 - 46th Annual Conference of the IEEE Industrial Electronics Society
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