Voltage-Sharing Converter to Supply Single-Phase Asymmetrical Four-Level Diode-Clamped Inverter With High Power Factor Loads

Arash A. Boora, Alireza Nami, Firuz Zare, Arindam Ghosh, Frede Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review

108 Citations (Scopus)

Abstract

The output voltage quality of some of the single-phase multilevel inverters can be improved when their dc-link voltages are regulated asymmetrically. Symmetrical and asymmetrical multilevel diode-clamped inverters have the problem of dc-link capacitor voltage balancing, especially when power factor of the load is close to unity. In this paper, a new single-inductor multi-output dc/dc converter is proposed that can control the dc-link voltages of a single-phase diode-clamped inverter asymmetrically to achieve voltage quality enhancement. The circuit of the presented converter is explained and the main equations are developed. A control strategy is proposed and explained in details. To validate the versatility of the proposed combination of the suggested dc–dc converter and the asymmetrical four-level diode-clamped inverter (ADCI), simulations and experiments have been directed. It is concluded that the proposed combination of introduced multioutput dc–dc converter and single-phase ADCI is a good candidate for power conversion in residential photovoltaic (PV) utilization.
Original languageEnglish
JournalI E E E Transactions on Power Electronics
Volume25
Issue number10
Pages (from-to)2507-2520
Number of pages14
ISSN0885-8993
DOIs
Publication statusPublished - Oct 2010

Keywords

  • Disturbance
  • Dynamic behavior
  • Input voltage disturbance
  • Multi-output DC-DC converters

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