Simulation and Test Bench Operation of the Drive Train of a Battery and Fuel Cell Hybrid Rail Vehicle

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The transport sector plays an important role in reducing global greenhouse gas emissions and achieving international climate targets. Electric railways are an energy-efficient means of transport and, with an appropriate electricity mix, cause significantly lower specific CO2 emissions than road and air alternatives. In Germany, about 50 % of the railway network is currently not electrified. These are mainly secondary sections of the regional and local transport network. Diesel-powered trains are used on these sections, a considerable number of which have been in operation for decades and will have to be replaced in the near future. Since an expansion of the overhead line infrastructure on less frequented lines is often not an economical option, but at the same time low-emission drives are required in the tenders for the operation of the lines, alternatives for lower-emission operation must be found. One option to which this work is dedicated is electric propulsion with energy supply from high-performance fuel cells and batteries. Within the framework of a publicly funded project, a test bench with such a novel drive train consisting of fuel cells, batteries and converters is being set up and tested at the CMP (Center for Mobile Propulsion) of RWTH Aachen University. The components involved and the overall structure will be modelled in a real-time-capable manner in order to theoretically test different operating modes and apply them in the real system. For hybrid electric vehicles, the energy management strategy for the power distribution between the fuel cells and batteries plays a central role in minimizing hydrogen consumption. For this purpose, an adaptive rule-based strategy is developed, optimized and compared with the reference strategy. The presented paper gives an insight into the different components and the test bench design. Furthermore, first simulation results are presented. Translated with (free version)

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