Reliability of DC-link Capacitors in Two-Stage Micro-Inverters Under Different PV Module Sizes

Ariya Sangwongwanich, Yanfeng Shen, Andrii Chub, Elizaveta Liivik, Dmitri Vinnikov, Huai Wang, Frede Blaabjerg

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

3 Citationer (Scopus)
190 Downloads (Pure)

Abstract

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 two stage 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 micro-inverter. Thus, using the 60-cell PV module offers a better tradeoff between the reliability and energy yield of the micro-inverter.
OriginalsprogEngelsk
TitelProceedings of 2019 10th International Conference on Power Electronics and ECCE Asia (ICPE 2019 - ECCE Asia)
Antal sider6
UdgivelsesstedKorea
ForlagIEEE Press
Publikationsdatomaj 2019
Sider1867-1872
Artikelnummer8797298
ISBN (Trykt)978-1-7281-1612-9
ISBN (Elektronisk)978-89-5708-313-0
StatusUdgivet - maj 2019
Begivenhed2019 10th International Conference on Power Electronics and ECCE Asia (ICPE 2019 - ECCE Asia) - Busan, Sydkorea
Varighed: 27 maj 201930 maj 2019

Konference

Konference2019 10th International Conference on Power Electronics and ECCE Asia (ICPE 2019 - ECCE Asia)
Land/OmrådeSydkorea
ByBusan
Periode27/05/201930/05/2019
NavnInternational Conference on Power Electronics
ISSN2150-6078

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