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Stability evaluation of a DC micro-grid and future interconnection to an AC system

Sanchez, Santiago; Molinas, Marta; Degano, Marco; Zanchetta, Pericle

Authors

Santiago Sanchez

Marta Molinas

Marco Degano

Pericle Zanchetta



Abstract

This paper presents the stability analysis of a DC micro-grid fed by renewable sources and the future interconnection with an AC micro-grid. This interconnection is realized through a voltage source converter, and the operation of the micro-grid is in island mode. The stability is analyzed by the Nyquist criteria with the impedance relation method. The frequency response of the models was obtained by the injection of a perturbation current at the operation point. Where this perturbation was at the input of the converter used to export power from the DC grid. Other perturbation was applied at the node of the micro-grid to evaluate its impedance. Finally the simulations show the impedance representation of the systems, and the stability for the interconnection of them. The experimental verification shows the impedance of the converter with the same tendency as the representation obtained by the analytical and simulation.

Journal Article Type Article
Publication Date Feb 1, 2014
Journal Renewable Energy
Print ISSN 0960-1481
Electronic ISSN 1879-0682
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 62
APA6 Citation Sanchez, S., Molinas, M., Degano, M., & Zanchetta, P. (2014). Stability evaluation of a DC micro-grid and future interconnection to an AC system. Renewable Energy, 62, doi:10.1016/j.renene.2013.08.026
DOI https://doi.org/10.1016/j.renene.2013.08.026
Keywords Microgrids; Renewable energy; Stability; Droop control; Smart grids
Publisher URL http://www.sciencedirect.com/science/article/pii/S096014811300428X
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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