Voltage Control and Stabilization of Distributed and Centralized DC Micro Grids
Conference: PCIM Europe 2015 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/19/2015 - 05/20/2015 at Nürnberg, Deutschland
Proceedings: PCIM Europe 2015
Pages: 8Language: englishTyp: PDF
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Authors:
Wunder, Bernd; Ott, Leopold; Han, Yunchao; Kaiser, Julian; Maerz, Martin (Fraunhofer IISB, Erlangen, Germany)
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.