A New Modular Multilevel Inverter Based on Step-Up Switched-Capacitor Modules

Aryorad Khodaparast, Erfan Azimi, Ali Azimi, M. Ebrahim Adabi, Jafar Adabi, Edris Pouresmaeil

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
91 Downloads (Pure)

Abstract

A new structure of switched capacitor multilevel inverter (SCMLI) capable of voltage boosting and with self-balancing ability is introduced in this article. This advantage is the result of a step by step rise of capacitor voltages in each module, supplied by just one DC voltage source. The proposed topology generates a sinusoidal output waveform with a magnitude several times greater than the input one. Higher output staircase AC voltage is obtained by applying a nearest level control (NLC) modulation technique. The most significant features of this configuration can be mentioned as: fewer semiconductor devices, remarkably low total harmonic distortion (THD), desirable operating under high/low frequency, high efficiency, inherent bipolar voltage production, easy circuit expansion, ease of control and size reduction of the circuit thanks to utilizing neither bulky transformer nor inductor. Moreover, the proposed SCMLI is comprehensively surveyed through theoretical investigation and a comparison of its effectiveness to recent topologies. Eventually, the operating principle of a 25-level prototype of the suggested SCMLI is validated by simulation in the MATLAB SIMULINK environment and experimental results.
Original languageEnglish
Article number524
Number of pages16
JournalEnergies
Volume12
Issue number3
DOIs
Publication statusPublished - 1 Feb 2019
MoE publication typeA1 Journal article-refereed

Keywords

  • Multilevel inverter
  • Self-balancing
  • Single-source converter
  • Step-up converter
  • Switched-capacitor

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