Design and implementation of a novel nine‐level MT‐MLI with a self‐voltage‐balancing switching technique. Issue 15 (4th November 2019)

• Record Type: Journal Article
• Authors: Naik, Banavath Shiva; Suresh, Yellasiri; Venkataramanaiah, Jammala; Panda, Anup Kumar
• Is Part Of: IET power electronics. Volume 12:Issue 15(2019)
• Page Start: 3953
• Page End: 3963
• Publication Date: 2019-11-04
• Subjects: invertors -- PWM power convertors -- capacitors -- switching convertors -- PWM invertors -- power capacitors; nine‐level MT‐MLI -- self‐voltage‐balancing switching technique -- nine‐level modified T‐type multilevel inverter -- simple capacitor balancing technique -- MT‐MLI circuit -- single DC source -- switching components -- flying capacitor -- DC source voltage -- phase disposition‐sine pulse‐width modulation technique -- DC‐link capacitors -- FC voltage -- external capacitor charging setup; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2018.6119
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : In this study, a novel nine‐level modified T‐type multilevel inverter (MT‐MLI) with a simple capacitor balancing technique is proposed. The proposed MT‐MLI circuit can generate higher levels with a single DC source and the minimum number of switching components. Each phase of the proposed topology contains ten switches and one flying capacitor (FC). The DC source voltage is divided into two parts with the help of capacitors. Phase disposition‐sine pulse‐width modulation technique is employed to regulate the DC‐link capacitors and FC voltages. To reduce the control complexity of FC‐based circuits, quarter‐cycle selector is introduced to control the FC voltage within the given half fundamental cycle using redundant states, so an external capacitor charging setup is not required. Furthermore, to highlight the potential merits of the proposed MT‐MLI, the comparison is made among state‐of‐the‐art MLIs. Simulation verification of the MT‐MLI is done using MATLAB/Simulink, and then hardware verifications are done using the laboratory prototype setup with Opal‐RT controller. Finally, adequate results are presented to validate the proposed MT‐MLI.