Design and Implementation of Asymmetric Cascaded Multilevel Inverter with Optimal Components

• Published in: Electric power components and systems Vol. 49; no. 4-5; pp. 361 - 374
• Main Authors: Chittathuru, Dhanamjayulu, Padmanaban, Sanjeevikumar, Prasad, Ramjee
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis 03.11.2021; Taylor & Francis Ltd
• Subjects: Asymmetry; Configurations; Electric potential; Harmonics; Inverters; multilevel inverter (MLI); pulse width modulation technique; Switches; total harmonic distortion (THD); Voltage
• ISSN: 1532-5008; 1532-5016
• DOI: 10.1080/15325008.2021.1970290

A novel asymmetrical cascaded one-twenty-five level multilevel inverter is proposed with optimal components. The proposed inverter consists of three sub-cells connected asymmetrical configuration to generate a 125-level output voltage. The sub-cell comprises six power switches and two DC sources to produce five output voltage levels with symmetrical configuration. This paper presents the five, twenty-five, one-twenty five-level inverters with optimal components with very lower harmonics. The results of the proposed inverters are experimentally tested with linear and non-linear loads. During dynamic circumstances, the suggested inverters are extremely stable. The proposed inverters will generate a greater voltage level with nominal harmonics as per IEEE standards. A complete comparison is made with previously published similar MLIs with proposed twenty-five MLI. The Proposed MLI has several merits such as cost factor, optimal components, THD, and TSV. The proposed five, twenty-five, and one-twenty-five level inverters are experimentally implemented with the help of the dSPACE RTI1104 controller. The proposed inverters are well suited for grid-connected and renewable applications.