“…Multimodal solutions have been proposed for applications of trams and suburban trains 16 as well as for Main line railway trains. 17,18 In this work, the authors investigate the usage of a multimodal passenger BEMU (Battery Electric Multiple Unit) on existing railway lines in Italy with sections of steep gradients.…”
A full electrification of many local railway lines is often not feasible or sustainable in terms of construction and maintenance costs or alternatively for the presence of additional constraints and limitations deriving from environmental or infrastructural limitations. Battery Operated Powertrains or other kind of hybrid solutions are currently proposed as sustainable alternatives to internal combustion engines for the propulsion of rolling stock on non-electrified lines. In this work, the authors propose the adoption of a partial electrification of lines to assure higher performances and reliability of battery-operated rolling stock designed to be recharged and feed using standard technologies such as pantographs gathering power from suspended catenaries. This innovative solution is designed for a benchmark test vehicle inspired from an existing one and simulated considering some possible scenario of application corresponding to some existing railway lines in Italy.
“…Multimodal solutions have been proposed for applications of trams and suburban trains 16 as well as for Main line railway trains. 17,18 In this work, the authors investigate the usage of a multimodal passenger BEMU (Battery Electric Multiple Unit) on existing railway lines in Italy with sections of steep gradients.…”
A full electrification of many local railway lines is often not feasible or sustainable in terms of construction and maintenance costs or alternatively for the presence of additional constraints and limitations deriving from environmental or infrastructural limitations. Battery Operated Powertrains or other kind of hybrid solutions are currently proposed as sustainable alternatives to internal combustion engines for the propulsion of rolling stock on non-electrified lines. In this work, the authors propose the adoption of a partial electrification of lines to assure higher performances and reliability of battery-operated rolling stock designed to be recharged and feed using standard technologies such as pantographs gathering power from suspended catenaries. This innovative solution is designed for a benchmark test vehicle inspired from an existing one and simulated considering some possible scenario of application corresponding to some existing railway lines in Italy.
“…In the last two-three years, multimodal trains have been proposed for different applications such as tramways, suburban [22] and conventional railways [23,24]; so this topic is still very important for the community of railway researchers.…”
A full electrification of many local railway lines is often not feasible or sustainable in terms of construction and maintenance costs or alternatively for the presence of additional constraints and limitations deriving from environmental or infrastructural limitations. Battery Operated or other kind of hybrid solutions powertrains are currently proposed as sustainable alternatives to Internal combustion engines for the propulsion of rolling stock on not electrified lines. In this work, authors propose the adoption of a partial electrification of lines to assure higher performances and reliability of battery-operated rolling stock designed to be recharged and feed using standard technologies such as pantographs gathering power from suspended catenaries. This innovative solution is designed and sized for a vehicle inspired from an existing one and simulated for two different existing lines, also proposing an optimal distribution of electrified sections dedicated to train recharge. This Case Study is simulated considering some possible applications to some existing railway lines in Italy.
“…Figure 2 shows the schematic structure of the modelled powertrain as well as the power split and power flow directions.Figure 2.Overview of power distribution between components of the FCEMU, including the battery resistance model and characteristic curve-based fuel cell model. Illustration adapted from Schenker et al 18 …”
Section: Introductionmentioning
confidence: 99%
“…Overview of power distribution between components of the FCEMU, including the battery resistance model and characteristic curve-based fuel cell model. Illustration adapted from Schenker et al 18 …”
Section: Introductionmentioning
confidence: 99%
“…Included are a simplified battery resistance model and characteristic curve-based fuel cell model. Illustration adapted from Schenker et al 18 …”
While the electrified rail network can directly utilize renewable energy sources, track electrification is costly and subject to environmental and structural limitations. Therefore, research is currently underway on alternative propulsion systems that enable overhead line-free operation. As a promising solution, the fuel cell electric drive came into focus as an emission-free drive system at the point of use. In order to be able to present a cost-efficient substitution of the propulsion systems in use today, an intensive examination of energy-optimal operating patterns, i.e. minimal fuel consumption, is crucial. This is the basis of this work, as it aims to develop an optimization algorithm that can handle fuel cell hybrid electric powertrains in a flexible and robust manner. The developed algorithm allows simultaneous optimization of the speed trajectory and on-board energy management with the aim of reducing hydrogen consumption. A comparison is made between a rule-based approach and the optimization algorithm. By simultaneously optimizing the trajectory and power distribution, 16% of the hydrogen savings potential can be achieved on a regional route in Germany compared to the rule-based approach. Finally, an in-depth evaluation of the algorithm’s ability to flexibly handle different fuel cell hybrid powertrain topologies is performed. The results show that the optimization algorithm opens up the possibility of evaluating reasonable fuel cell hybrid component sizes while achieving optimal operation. Thus, it can be used in the future to support feasibility analysis for specific use cases.
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