A single-stage three-phase inverter based on cuk converters for PV applications

Ahmed Badawy, Derrick Holliday, Shehab Ahmed, Ahmed Massoud, Barry Williams

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

This paper presents a new three-phase inverter based on the Cuk converter. The main feature of the proposed topology is that the energy storage elements such as inductors and capacitors, can be reduced in order to improve the reliability, reduce the size, and the total cost. The buck-boost inherent characteristic of the Cuk converter, depending on the time-varying duty ratio, provides flexibility for stand-alone and grid connected applications when the required output ac voltage is lower or greater than the dc side voltage. This property is not found in the conventional current source inverter when the dc input current is always greater than the ac output or in the conventional voltage source inverter as the output ac voltage is always lower than the dc input. The proposed system allows much smaller, more reliable non-electrolytic capacitors to be used for energy source filtering. The new three-phase inverter is convenient for PV applications where continuous input currents are required for maximum power point tracking operation. Average large and small signal models are used to study the Cuk converter’s nonlinear operation. The basic structure, control design, and MATLAB/SIMULINK results are presented. Practical results substantiate the design flexibility of the Cuk based topology controlled by a TMSF280335 DSP.
Original languageEnglish
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Early online date21 Mar 2014
DOIs
Publication statusE-pub ahead of print - 21 Mar 2014

Keywords

  • three-phase inverter
  • voltage
  • PV applications

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