Circuit Configuration and Modulation of a seven-level Switched-Capacitor Multilevel Inverter

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

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

In this paper, a step-up seven-level inverter supplied by a single DC source suitable for renewable energy application is presented. Forming the desired output is realized by charging capacitors and synthesizing them based on switched-capacitor concept. This structure is praised for the ability of sensor-less voltage balancing of the capacitors, reducing control complexity to produce a bipolar staircase waveform. It also benefits from regenerative performance, avoiding unwanted capacitors overvoltage. Phase Disposition Pulse Width Modulation technique is utilized to control the circuit operation. Furthermore, a comparison with other recent topologies reveals that losses, number of semiconductor devices, and gate driver circuits are reduced. Theoretical analysis is verified through a laboratory prototype implementation. Experimental results under various types of loads approve the performance of the proposed inverter and validity of the design. Finally, maximum experimental efficiency of 94.3% (115 V, 250 W load) was reached.
Original languageEnglish
Number of pages10
JournalIEEE Transactions on Power Electronics
DOIs
Publication statusE-pub ahead of print - 6 Nov 2020
MoE publication typeA1 Journal article-refereed

Keywords

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

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