Single-Stage Three-Phase Differential-Mode Buck-Boost Inverters with Continuous Input Current for PV Applications

Ahmed Darwish, Ahmed M. Massoud, Derrick Holliday, Shehab Ahmed, B. W. Williams

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Differential-mode buck-boost inverters have merits such as reduced switch number, ability to provide voltages higher or lower than the input voltage magnitude, improved efficiency, reduced cost and size, and increased power density, especially in low-power applications. There are five buck-boost inverters that can provide flexible output voltage without the need of a large electrolytic input side capacitor, which degrades the reliability of inverters. The continuous input current of these inverters is appropriate for maximum power point tracking operation in photovoltaic and fuel cells applications. Three of the five inverters can be isolated with high-frequency-link transformers where the common-mode leakage current can be mitigated. However, the performance and control of such converters have not been discussed in detail. In this paper, the five possible single-stage three-phase differential-mode buck-boost inverters with continuous input current are investigated and compared in terms of total losses, maximum ripple current, total harmonic distortion, and device and passive element ratings. In addition, the possible methods are presented for eliminating the input third-order harmonic current, resulting from the stored energy in the passive elements, as well as the output second-order harmonic currents. The ability for isolating the input and output sides of the inverters with a small-high frequency transformers is discussed. A changeable-terminal 2.5-kW bidirectional inverter is used to validate the design flexibility of the inverter topologies, when digital signal processor-controlled.

Original languageEnglish
Article number7377101
Pages (from-to)8218-8236
Number of pages19
JournalIEEE Transactions on Power Electronics
Volume31
Issue number12
DOIs
Publication statusPublished - 1 Dec 2016

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Keywords

  • Buck-boost inverter
  • Cuk converter
  • DC-DC converters
  • high-frequency transformers
  • SEPIC converter
  • sliding mode control
  • state-space averaging
  • switched mode power supply

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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