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Reliability of DC-link Capacitors in Two-Stage Micro-Inverters under different PV Module Sizes
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Type
Proceeding
Author
Ariya Sangwongwanich (Aalborg University) Yanfeng Shen (University of Cambridge) Andrii Chub (TalTech University) Elizaveta Liivik (Aalborg University) Dmitri Vinnikov (TalTech University) Huai Wang (Aalborg University) Frede Blaabjerg (Aalborg University)
Journal
THE KOREAN INSTITUTE OF POWER ELECTRONICS ICPE(ISPE)논문집 ICPE 2019-ECCE Asia SCOPUS
Published
2019.5
Pages
1,867 - 1,872 (6page)

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Reliability of DC-link Capacitors in Two-Stage Micro-Inverters under different PV Module Sizes
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The dc-link capacitor is one of the lifetime-limiting components in the photovoltaic (PV) micro-inverters, whose reliability should be evaluated carefully during the design. In micro-inverters, the PV module size (e.g., number of cells) is the parameter that determines the power rating of the PV module. The PV module size employed in the micro-inverter can vary for different manufacturers, and this variation can strongly affect the thermal stress and reliability of the dc-link capacitor in micro-inverters. To address this issue, an experimental-based reliability assessment is carried out in this paper using a twostage micro-inverter where 60-cell and 72-cell PV modules are considered. Three different daily mission profiles are employed during the experimental test. The thermal stress and reliability of the dc-link capacitor under different operating conditions are evaluated together with the energy yield. The results indicate that employing a 60-cell PV module is more beneficial for the micro-inverter, especially during a clear day, where 19 % more energy can be captured during the entire lifespan of the microinverter. Thus, using the 60-cell PV module offers a better tradeoff between the reliability and energy yield of the micro-inverter.
#Reliability #capacitors #mission profile #microinverters #PV modules

Contents

Abstract
I. INTRODUCTION
II. PHOTOVOLTAIC MICRO-INVERTERS
III. RELIABILITY ASSESSMENT OF DC-LINK CAPACITORS
IV. CASE STUDIES
V. CONCLUSIONS
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