Capacitor Lifetime Extension of Interleaved DC–DC Converters for Multistring PV Systems

Abraham Marquez Alcaide, Youngjong Ko, Markus Andresen, Jose I. Leon, Sergio Vazquez, Vito Giuseppe Monopoli, Giampaolo Buticchi, Marco Liserre, Leopoldo G. Franquelo

Research output: Journal PublicationArticlepeer-review

1 Citation (Scopus)


Interleaved dc–dc converters are being vastly applied for a wide range of applications. Inherent power sharing between the power modules and reduction of the output waveforms ripple are the main advantages of these power systems. However, in some cases, such as the multistring photovoltaic converters, each power module manages different power, leading to an unbalanced operation of the interleaved converters. In this case, the harmonic response of the conventional interleaving operation is degraded. This fact affects directly the expected lifetime of the dc-link capacitor of the power converter, which is one critical components of the system. In this article, a variable-angle phase displacement angle is proposed in order to mitigate this problem, achieving an extension of the converter lifetime.

Original languageEnglish
Pages (from-to)4854-4864
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number5
Publication statusPublished - 1 May 2023


  • Harmonic analysis
  • multilevel converters
  • pulsewidth modulation

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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