Stability of DC micro-grid for urban railway systems

Author(s): Sarah Nasra,b, Marc Petita, Marius Iordacheb, Olivier Langloisb
aGeePs | Group of electrical engineering – Paris UMR CNRS 8507, CentraleSupélec, Univ Paris-Sud, Sorbonne Universités, UPMC Univ Paris 06, 3-11 rue Joliot-Curie, Plateau de Moulon F-91192 Gif-sur-Yvette CEDEX
bAlstom Transport SA, 48 rue Albert Dhalenne, Saint-Ouen 93400, France
International Journal of Smart Grid and Clean Energy, vol. 4, no. 3, July 2015: pp. 261-268
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.4.3.261-268

Abstract: This paper studies the stability of a DC Micro-grid integrated in urban railway systems in order to recover trains braking energy. It is a green solution based on storing the excess of braking energy in a hybrid storage system and re-using it in non-railway applications such as auxiliary loads in a station or electric vehicles in proximity, which will increase the global energy efficiency. The risk of instability caused by constant power loads is detailed and solved using backstepping approach. It is shown that this problem can be solved by controlling the energy storage system.

Keywords: DC Micro-grid, stability, backstepping, railway, hybrid storage system

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