Project ElectriFly: Electric Commuter Aircraft with Mid-Flight Recharging Capability

Bachelor Thesis: Design Synthesis Exercise 2023<br/>Group 13: Electric General Aircraft<br/><i>in collaboration with</i><br/>Group 10: Mid-Flight Recharging System<br/><br/>Addressing the pressing need for sustainability amid climate change, the aviation sector is under pressure to mitigate its significant carbon emissions. As aviation accounts...

Cost-effective upgrade of the Dutch traction power network: Moving to Bi-directional and controllable 3 kV DC substations for improved performance

Traction power networks can significantly influence a country's national grid due to their significant power consumption and numerous coupling points. To modernise the ageing Dutch traction power networks and enhance their impact on the utility grid, this study explores practical and cost-effective approaches for upgrading existing 1.5 kV DC...

Increasing the Braking Energy Recuperation in Electric Transportation Grids Without Storage

When the braking energy in electric transportation grids is not met by another vehicle's demand, it is either harvested by storage systems or wasted in braking resistors. This paper looks at three methods for increasing the amount of harvested braking energy without the use of expensive storage systems: decreasing the substation voltage,...

A simple method for sizing and estimating the performance of PV systems in trolleybus grids

Solar PV systems have so far been the source of choice for the sustainable supply of urban electric transport networks—like trams and trolleybus grids. However, no consensus exists yet on the placement or sizing of PV systems at the traction substations, and no method is available for easy estimation of the PV system utilization performance....

A Complete DC Trolleybus Grid Model With Bilateral Connections, Feeder Cables, and Bus Auxiliaries

This paper offers a complete and verified model of DC trolleybus grids and examines the effect of the common modelling assumptions made in literature by using simulations, as well as bus and substation measurements from the grid of Arnhem, the Netherlands. An equivalent model for the overhead line impedance is offered taking into account the...

Energy-efficient train control using nonlinear bounded regenerative braking

Energy-efficient train control (EETC) has been studied a lot over the last decades, because it contributes to cost savings and reduction of CO₂ emissions. The aim of EETC is to minimize total traction energy consumption of a train run given the running time in the timetable. Most research is focused to apply mechanical braking on...

Integration of real-time traffic management and train control for rail networks: Part 2: Extensions towards energy-efficient train operations

We study the integration of real-time traffic management and train control by using mixed-integer nonlinear programming (MINLP) and mixed-integer linear programming (MILP) approaches. In Part 1 of the paper (Luan et al., 2018), three integrated optimization problems, namely the P_NLP problem (NLP: nonlinear programming), the P<sub...

Review of energy-efficient train control and timetabling

The energy consumption of trains is highly efficient due to the low friction between steel wheels and rails, although the efficiency is also influenced largely by the driving strategy applied and the scheduled running times in the timetable. Optimal energy-efficient driving strategies can reduce operating costs significantly and contribute to a...

Effect of regenerative braking on energy-efficient train control

An important topic to reduce the energy consumption in railways is the use of energy-efficient train control (EETC). Modern trains allow regen-erative braking where the released kinetic energy can be reused. This regener-ative braking has an effect on the optimal driving regimes compared to trains which can only use mechanical braking. This...

Regenerative braking in scooters - is it worth it?

This graduation project focused on the scooter. Scooters offer cheap, flexible and reliable transport. However, their emissions are quite high. This leads to the problem description for this project: energy efficiency in current scooters is not as high as it can be. A lot of improvement can be gained in the vehicles efficiency by regenerating...