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


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. This 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
Pages (from-to)3068-3076
Number of pages9
JournalIEEE Transactions on Power Electronics
Issue number6
Early online date18 Jun 2014
Publication statusPublished - Jun 2015

Bibliographical note

© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.


  • DC–DC power conversion
  • maximum power point tracking
  • phase shift
  • photovoltaic power system
  • voltage control


Dive into the research topics of 'Three-port DC-DC converter for stand-alone photovoltaic systems'. Together they form a unique fingerprint.

Cite this