Capacitor Lifetime Extension of Interleaved dc-dc Converters for Multi-String PV Systems

Abraham M. Alcaide, Youngjong Ko, Markus Andresen, Jose I. Leon, S. Vazquez, Vito G. Monopoli, G. 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 multi-string 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 component of the system. In this paper, 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)1-11
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Publication statusAccepted/In press - 2022


  • Capacitors
  • DC-DC power converters
  • Harmonic analysis
  • Harmonic analysis
  • Inverters
  • Multichip modules
  • Multilevel converters
  • Power harmonic filters
  • Pulse width modulation
  • Stress

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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