Improved reliability of single-phase PV inverters by limiting the maximum feed-in power

Yongheng Yang, Huai Wang, Frede Blaabjerg

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    20 Scopus citations

    Abstract

    Grid operation experiences have revealed the necessity to limit the maximum feed-in power from PV inverter systems under a high penetration scenario in order to avoid voltage and frequency instability issues. A Constant Power Generation (CPG) control method has been proposed at the inverter level. The CPG control strategy is activated only when the DC input power from PV panels exceeds a specific power limit. It enables to limit the maximum feed-in power to the electric grids and also to improve the utilization of PV inverters. As a further study, this paper investigates the reliability performance of the power devices (e.g. IGBTs) used in PV inverters with the CPG control under different feed-in power limits. A long-term mission profile (i.e. solar irradiance and ambient temperature) based stress analysis approach is extended and applied to obtain the yearly electrical and thermal stresses of the power devices, allowing a quantitative prediction of the power device lifetime. A study case on a 3 kW single-phase PV inverter has demonstrated the advantages of the CPG control in terms of improved reliability.

    Original languageBritish English
    Title of host publication2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages128-135
    Number of pages8
    ISBN (Electronic)9781479956982
    DOIs
    StatePublished - 11 Nov 2014

    Publication series

    Name2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014

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