Three-port DC-DC converter for stand-alone photovoltaic systems

Yihua Hu, Weidong Xiao, Wenping Cao, Bing Ji, D. John Morrow

Research output: Contribution to journalArticle

81 Citations (Scopus)
162 Downloads (Pure)

Abstract

System efficiency and cost effectiveness are of critical importance for photovoltaic (PV) systems. This paper addresses the two issues by developing a novel three-port DC-DC converter for stand-alone PV systems, based on an improved Flyback-Forward topology. It provides a compact single-unit solution with a combined feature of optimized maximum power point tracking (MPPT), high step-up ratio, galvanic isolation and multiple operating modes for domestic and aerospace applications. A theoretical analysis is conducted to analyze the operating modes followed by simulation and experimental work. The paper is focused on a comprehensive modulation strategy utilizing both PWM and phase-shifted control that satisfies the requirement of PV power systems to achieve MPPT and output voltage regulation. A 250 W converter was designed and prototyped to provide experimental verification in term of system integration and high conversion efficiency.
Original languageEnglish
Number of pages10
JournalIEEE Transactions on Power Electronics
DOIs
Publication statusPublished - 2014

Keywords

  • dc-dc power conversion
  • maximum power point tracking
  • phase shift
  • photovoltaic power system
  • voltage control

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