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 journalArticlepeer-review

100 Citations (Scopus)
163 Downloads (Pure)


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
Publication statusPublished - 2014


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


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