A new switched-capacitor multilevel inverter with soft start and quasi resonant charging capabilities

Md N.H. Khan, R. Barzegarkhoo, Y.P. Siwakoti, S.A. Khan, L. Li, Frede Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review

1 Citation (Scopus)

Abstract

Switched-capacitor multilevel inverters (SCMLIs) are gaining widespread attention in recent decades due to their simple design, voltage boosting capability, and inherent capacitor voltage balancing feature. However, the advantages offered by SCMLIs come at the cost of employing a higher number of active and passive components and capacitor voltage balancing issues with an inrush current profile. This paper introduces a novel configuration of SCMLIs with a lower number of power components with inherent voltage boost. The basic 5-level topology consists of a single capacitor, an inductor, a diode, and seven active switching elements. To improve the transient response and the inrush current profile of the converter, a soft start and quasi-resonant charging capability has been explored and implemented. Considering the inherent capacitor voltage balancing of the proposed SCMLI, a new finite control set-model predictive control (FCS-MPC) method with a single objective and a less computational burden is also developed, which contributes to injecting a fully controlled current for the grid-connected applications. The proposed topology is compared with other existing five-level inverter topologies to show its superior capabilities/advantages. And finally, the performance of the proposed topology and its associated FCS-MPC mechanism are validated by the measurement results.

Original languageEnglish
Article number107412
JournalInternational Journal of Electrical Power & Energy Systems
Volume135
Pages (from-to)1-11
Number of pages11
ISSN0142-0615
DOIs
Publication statusPublished - Feb 2022

Keywords

  • Multilevel inverter
  • H-bridge
  • Quasi-resonant circuit
  • Soft charging

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