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Reliability consideration of low-power-grid-tied inverter for photovoltaic application

: Liu, J.; Henze, N.

Fulltext urn:nbn:de:0011-n-1290228 (357 KByte PDF)
MD5 Fingerprint: fc13e86d36c6e7aa03d52a9f5720933c
Created on: 24.4.2010

Sinke, W. ; WIP - Renewable Energies, München; European Commission; UNESCO; World Council for Renewable Energy; International Photovoltaic Equipment Association:
24th European Photovoltaic Solar Energy Conference 2009. CD-ROM : The compiled State-of-the-Art of PV Solar Technology and Deployment. Proceedings of the International Conference held in Hamburg, 21-25 September 2009
München, 2009
ISBN: 3-936338-25-6
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <24, 2009, Hamburg>
Conference Paper, Electronic Publication
Fraunhofer IWES ()
reliability; AC-module; inverter; modelling; module integration

In recent years PV modules have been improved evidently. An excellent reliability has been validated corresponding to Mean Time between Failure (MTBF) between 500 and 6000 years respectively in commercial utility power systems. Manufactures can provide performance guarantees for PV modules at least for 20 years. If an average inverter lifetime of 5 years is assumed, it is evident that the overall reliability of PV systems [PVSs] with integrated inverter is determined chiefly by the inverter itself. It must be considered that the module integration of the inverter results in harsh environment especially like high temperature stress. This paper presents a single stage integrated inverter applied in low power situation, analyzes the failure rate, contrasts three different approaches of reliability prediction for electronic equipment and simulates the thermal behavior of the integration PVSs. As a result, a high reliability PV inverter has been achieved successfully by employing film capacitors and semiconductor power modules instead of conventional electrolytic capacitor and discrete power switches. Moreover, an optimum housing design in terms of thermal management improves the inverter reliability.