A Geometric Series Based Nearest Level Modulation Scheme for Multilevel Inverter

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

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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.
TidsskriftProceedings of the Annual Conference of the IEEE Industrial Electronics Society
Sider (fra-til)3138-3142
StatusUdgivet - 2020
BegivenhedIECON 2020 - 46th Annual Conference of the IEEE Industrial Electronics Society - Online
Varighed: 18 okt. 202021 okt. 2020


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