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Voltage control and stabilization of distributed and centralized DC micro grids

 
: Wunder, B.; Ott, L.; Han, Y.; Kaiser, J.; März, M.

MESAGO PCIM GmbH, Stuttgart:
PCIM Europe 2015. CD-ROM : International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, Nuremberg, 19 – 21 May 2015; Proceedings
Berlin: VDE Verlag, 2015
ISBN: 978-3-8007-3924-0
8 pp.
International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management <2015, Nuremberg>
English
Conference Paper
Fraunhofer IISB ()

Abstract
This paper describes a distributed DC micro grid voltage control strategy. Starting point is the small-signal modelling of DC/DC converters interfacing sources and loads to a DC supply bus. Based on this model, a stability analysis of the micro grid can be conducted. Voltage control is realized with a droop control technique. This proposed method is optimized for a DC micro grid with several distributed sources. It is shown, that different droop characteristic curves can influence the grid behavior of the source converters to realize a safe and reliable energy management of distributed resources and a stable operation of the grid. Finally, a proof of concept is being done with a case study on a small experimental grid with two distributed source converters and two loads. The measurement results and the performance of this method are presented.

: http://publica.fraunhofer.de/documents/N-379763.html