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Why is it important?
These days, Symmetric multilevel inverters (SMLIs) have become as one of the efficient solutions to improve the output power quality of many renewable-energy based applications. To achieve better output power spectrum in the conventional types of SMLIs, as the number of output voltage levels increases, the number of required power switches and the overall cost will be enhanced. The aim of this study is to present a new cost effective SMLIs configuration, which can generate greater number of output voltage levels with a least of switching devices. The proposed structure contains a novel switched-dc-source (SDCS) sub-module that can produce three positive output voltage levels with a contribution of four equal dc voltage sources, two unidirectional, and one bi-directional power switches. Accordingly, to create a uniform staircase output voltage with multiple levels, the proposed SDCS sub-module is integrated into a new design. Therefore, a new family of reduced switch-count (RSC)-SMLIs is derived, which is capable of generating at least 13- and 15-level output voltages using only ten power switches and nine gate drivers. Furthermore, when employing several of the proposed SDCS sub-modules in series, a new generalized RSC-SMLI topology is obtained.
Perspectives
The proposed structure employs a novel SDCS sub-module that can control the dc-link voltage of four isolated dc voltage sources with three power switches. By a series connection of the proposed SDCSs integrated into a new circuit configuration, a considerable number of output voltage levels with a reduced number of required power switches can be obtained. The overall cost evaluations of the proposed topology have been also conducted in this paper. The power loss analysis was developed which proves that the proposed structure has an acceptable condition in reduction of the maximum number of involved power switches in the load current path as well as conduction losses. Finally, simulation and experimental results were provided in this paper, which verified the overall performance of the proposed RSC-SMLI topology.
Hossein Nasiri Avanaki
Zanjan University
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This page is a summary of: Reduced Switch-Count Structure for Symmetric Multilevel Inverters with a Novel Switched-DC-Source Sub-Module, IET Power Electronics, November 2018, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/iet-pel.2018.5089.
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