A Unified Approach to Reliability Assessment of Multiphase DC-DC Converters in Photovoltaic Energy Conversion Systems

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 cond...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2012-02, Vol.27 (2), p.739-751
Main Authors: Dhople, S. V., Davoudi, A., Domínguez-García, Alejandro D., Chapman, P. L.
Format: Article
Language:English
Subjects:
Analytical models
Applied sciences
Capacitors
Circuit properties
Converters
Direct energy conversion and energy accumulation
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electrical power engineering
Electronic circuits
Electronics
Energy
Exact sciences and technology
Fault tolerance
Integrated circuit reliability
Markov analysis
Markov reliability modeling
Mathematical models
maximum power point tracking (MPPT)
Natural energy
Photoelectric conversion
Photovoltaic cells
Photovoltaic conversion
photovoltaics
Power reliability
Signal convertors
Solar cells. Photoelectrochemical cells
Solar energy
Steady-state
switch-mode dc-dc converters
Switches
Switching
Testing. Reliability. Quality control
Transformers
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Description
Summary: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.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2010.2103329