Dynamics of photovoltaic-generator-interfacing voltage-controlled buck power stage

M. Sitbon, J. Leppäaho, T. Suntio, A. Kuperman

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


This paper investigates the dynamic properties of the photovoltaic-generator-interfacing voltage-controlled buck power stage operating in both the maximum and limited power point tracking modes. The photovoltaic generator (PVG) is known to possess both current- and voltage-source properties with respect to its maximum power point. While voltage-fed operation is conventional, current-fed action is nontrivial and is thoroughly analyzed in this paper. The photovoltaic-generator-interfacing converter is formed by adding a capacitor at conventional voltage-fed converter input terminals, turning it into a current-fed power stage. During the maximum power point tracking phase, converter input voltage is regulated, possessing nontrivial dynamics. The situation is burdened further when output-voltage control should be alternatively realized to limit the voltage of the converter terminating the energy storage element. It is shown that both the photovoltaic generator and the terminating energy storage greatly affect the combined system dynamics. Parallel as well as cascaded control arrangements are proposed to support dual-mode system operation. Extended experimental results are shown to enforce presented theory and reveal nontrivial dynamics-related issues.

Original languageEnglish
Article number6995990
Pages (from-to)633-640
Number of pages8
JournalIEEE Journal of Photovoltaics
Issue number2
StatePublished - 1 Mar 2015
Externally publishedYes


  • Current-fed buck converter
  • dynamics
  • photovoltaic generator (PVG)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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