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Micro-grid autonomous operation during and subsequent to islanding process

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3 Author(s)
Katiraei, F. ; Dept. of Electr. & Comput. Eng., Univ. of Toronto, Ont., Canada ; Iravani, M.R. ; Lehn, P.W.

This paper investigates (i) preplanned switching events and (ii) fault events that lead to islanding of a distribution subsystem and formation of a micro-grid. The micro-grid includes two distributed generation (DG) units. One unit is a conventional rotating synchronous machine and the other is interfaced through a power electronic converter. The interface converter of the latter unit is equipped with independent real and reactive power control to minimize islanding transients and maintain both angle stability and voltage quality within the micro-grid. The studies are performed based on a digital computer simulation approach using the PSCAD/EMTDC software package. The studies show that an appropriate control strategy for the power electronically interfaced DG unit can ensure stability of the micro-grid and maintain voltage quality at designated buses, even during islanding transients. This paper concludes that presence of an electronically-interfaced DG unit makes the concept of micro-grid a technically viable option for further investigations.

Published in:

Power Delivery, IEEE Transactions on  (Volume:20 ,  Issue: 1 )

Date of Publication:

Jan. 2005

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