Abstract
This paper presents an analysis on using an on-board energy storage device (ESD) for enhancing braking energy re-use in electrified railway transportation. A simulation model was developed in the programming language C++ to help with the sizing of the ESD. The simulation model based on the mathematical description has been proposed for a train equipped with on-board ESD for analysis of effectiveness of its application. A case study was carried out for a metro line taking into consideration train characteristics, track alignment, line velocity limits and a running time table. This case study was used to assess the energy savings and perform a cost-benefit analysis for different sizes of the on-board ESD by applying the proposed approach. It was shown that when additional environmental benefits (reduction of CO2 emissions) are considered, this may significantly improve effectiveness of the investments due to CO2 European Emission allowances.
Highlights
Railway transportation generates 3.6% of the total CO2 emissions from the transport sector and constitutes 2.1% of the total transport energy consumption [1]
The scope of this paper is to present a simulation tool that incorporates all the requirements to design a functional train model, with an on-board energy storage devices (ESD), that can be implemented in a programming language like C++ for its application in a physical rail transport system
The train output data: speed, distance, power, energy, energy lost on braking rheostats as a function of time (1 s); The ESD output data: state of charge (SOC), energy; The average values for a train running between two stations: average speed, distance, travel time, energy lost on braking rheostats and total energy saved by the on-board ESD
Summary
Railway transportation generates 3.6% of the total CO2 emissions from the transport sector and constitutes 2.1% of the total transport energy consumption [1]. The authors in [18] propose a Matlab/Simulink model for a metro-train simulator with an on-board ESD to reduce the network power demand and save energy. The main contributions of this paper are: the proposal of a mathematical model and its application for analysis of an electrified urban railway system with on-board ESD; presentation of the simulation tool with its application for finding optimized solution for an on-board ESD that focuses on: reducing the cost, saving energy and improving ESD application effectiveness, considers the benefits due to CO2 emission reduction. Presentation and discussions of conclusions from a case study—application of the developed tool to analyse the effectiveness of installing an ESD on-board trains in a real metro system This includes a presentation of influence of energy cost—with stabile or a sudden increase in energy prices and current costs of the European Emission allowances considered.
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