Challenge A: A more and more energy efficient railway Substation ...

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Challenge A: A more and more energy efficient railway The simulation results show the interest of a combination of storage systems with batteries and ultra capacitors. In fact, the battery will provide or store the power fluctuations in order to obtain the output of the power converter P charge of 7Kw. Profiles of real power from renewable generators are very volatile. The battery will undergo very large changes in its terminals. Yet, it is not expected to produce as many rounds in such a short time. We must, therefore, put in place in the supervision of the filtering equation powers to smooth these variations in order not to reduce the lifetime of this storage system. Figure 5 : Model concept of MATLAB / SIMULINK system The figure here below shows the management of the slow component from the battery and the management of the fast component by ultra capacitors. Curve of power sent to the battery Curve of power sent to the ultra capacitor Figure 6 : Monitoring and filtering of all battery ultra capacitors
Challenge A: A more and more energy efficient railway The many experiments conducted have proved the optimal design of a final source of combined photovoltaic and wind. The power of the annual consumption of 62.1MWh/year of auxiliary services of the electric traction substation needs to be implemented: • A solar power 23KW ( area 116sq.m. according to the technologies) • Wind power of 25kW at a high level of 20meters In spite of first design approach and validation of laboratory tests, many questions still remain about the implementation of energy storage devices. In fact, defining the time of the unavailability of energy production facility and the weather very random does not ensure the objective full autonomy of the installation by design optimized storage devices. But laboratory tests have provided certainly on the choice of the association of battery components and ultra capacitors but eh distribution of absorbed power between the two storage components to be installed is not validated. These questions and uncertainties pushed to think of applications and of a more interesting management from a technical and economic point of view. Economic balance The cost of energy expended by SNCF company linked to the consumption of auxiliary services of a traction substation is estimated at 3000€ in 2010. The trend of changes in the cost of energy following the introduction of the NOME expected to increase 35% in 2020. The estimated cost for the installation of energy production previously dimensioned: • For the photovoltaic about 850€/sq.m installed on the ground (converters included , all fees included in the design of the installation commissioning and on-site staff training) about 98k€. • For a three-bladed wind about 100k€ for 20kw power (price including wind turbine tower control wiring and engineering costs of installation and commissioning). Even if the interest environment is established under the CAN substation is clearly not very profitable in a purely economical aspect. Prototype The different approaches discussed above lead to a reflection judicious use of a process of energy control. Why the company SNCF will try a system based on renewable energy line item in the draft line electrification 2x25kV Bourges – Saincaize. Integrated monitoring software will benefit from a return to experience and validate the optimal approach to adopt. These first results will validate the methodologies and resultants presented above. The entire equipment of the facility is sized to allow a constant supply of daily 5kWh. Storage devices with batteries are designed to ensure the system power for three days.
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Challenge A: A more and more energy efficient railway Substation ...

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