A unified approach to reliability assessment of multiphase DC-DC converters in photovoltaic energy conversion systems

Sairaj V. Dhople, Ali Davoudi, Alejandro D. Domínguez-García, Patrick L. Chapman

Research output: Contribution to journalArticle

Abstract

A systematic framework for reliability assessment and fault-tolerant design of multiphase dc-dc converters deployed in photovoltaic applications is presented. System-level steady-state models allow a detailed specification of component failure rates, and in turn establish the effects of ambient conditions and converter design on reliability. Markov reliability models are derived to estimate the mean time to system failure. Case studies applied to two-and three-phase, 250-W converters demonstrate that topological redundancy does not necessarily translate to improved reliability for all choices of switching frequency and capacitance. Capacitor voltage rating is found to be the dominant factor that affects system reliability.

Original languageEnglish (US)
Article number5678654
Pages (from-to)739-751
Number of pages13
JournalIEEE Transactions on Power Electronics
Volume27
Issue number2
DOIs
StatePublished - Jan 16 2012

Keywords

  • Markov reliability modeling
  • maximum power point tracking (MPPT)
  • photovoltaics
  • switch-mode dc-dc converters

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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