Power Flow Simulation of Flywheel Energy Storage Systems for Tramways   N. Erd, X. Li, A. Binder   2017/04/25

Abstract

Energy storage devices, such as flywheel storages, can be used in railway systems, especially tramways, to save energy from being turned into heat in the braking resistor. This paper provides a quantitative analysis for the possible energy savings by using a flywheel energy storage system
in a tramway. For this purpose a flywheel is modeled considering various internal losses. Based on the defined operating strategy, the power flow of the traction system is analyzed for a given driving cycle. The energy consumption of a tram with a flywheel system is compared to the consumption of a conventional tram without an energy storage device and a tram with a storage device based on supercaps. Finally, the influence of the grid feedin power limit on the energy savings is analyzed.

Authors and affiliations

N. Erd, X. Li, A. Binder
Institute of Electrical Energy Conversion, Graduate School of Excellence Energy Science and Engineering
Technische Universität Darmstadt. Germany

Key word

Flywheel, Energy Storage, Tramway, Train, Energy Savings, Supercap

References

[1] M. Beek and M. Klohr, "RNV und der MITRAC Energy Saver - ein Erfahrungsbericht (RNV and MITRAC Energy-Saver - report of experiences)," ZEVrail, no. 137, pp. 202-209, 2013.
[2] P. Arboleya, P. Bldaguren and U. Armendariz, "Energy is on Board," IEEE Electrification Magazine, pp. 30-41, 2016.
[3] T. Ratniyomachai, S. Hillmansen and P. Tricoli, "Recent developments and applications of energy storage devices in electrified railways," IET Electrical Systems in Transportation, vol. 4, pp. 9-20, 2014.
[4] X. Li, N. Erd und A. Binder, „Evaluation of Flywheel Energy Storage Systems for Residential Photovoltaic
Installations,“ in International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), Capri Island, Italy, 2016.
[5] www.trampicturebook.de, 2016. [Online].
[6] H. Liu, M. Werst, J. J. Hahne and D. Bogard, "Prediction of windage losses of an enclosed high speed composite rotor in low air pressure environments," in Heat Transfer Summer Conf., Las Vegas, USA, 2003.
[7] Maxwell Technologies Inc., „Datasheet K2 Ultracapacitors,“ 2016. [Online].