This paper discusses methods for quantifying the performance of microgrids during island operation. Such methods are essential for comparing different designs and different control algorithms. Performance indicators and objectives are proposed for voltage-quality variations, for individual dips and interruptions, and for the reliability during island operation. Part of this work was done within the EU-DEEP project, funded by the European Commission, Svenska Kraftnät and the Swedish Energy Administration. M.H.J. Bollen is with STRI AB, 771 80 Ludvika, Sweden and with Luleå
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