Multi-modelling for Decarbonisation in Urban Rail Systems

Abstract

This paper demonstrates a methodology for flexible, dynamic systems modelling relevant to urban rail decarbonisation. Decarbonisation of urban rail is a vital component of policy and strategy to minimize anthropogenic emissions. Decarbonisation is a systems problem, however, that needs to reflect the interaction between components and processes. Dynamic computer modelling of systems for decarbonisation involves interfacing multiple models together and running them in parallel in order to observe and predict systems-level effects. This is challenging due to the diverse nature of models, achieving parallel model integration and concerns around intellectual property (IP). One solution is the multi-modelling paradigm, which supports integrated, diverse, secure interfacing of models. This paper demonstrates the application of the multi-modelling approach, using the INTO-CPS tool chain. A multi-model was developed comprising key components required for urban rail decarbonisation problems. This multi-model was tested for power consumption in four different scenarios with an example drawn from the Tyne and Wear Metro in Newcastle-upon-Tyne in the United Kingdom. These scenarios compared combinations of decarbonisation intervention (baseline rolling stock versus lightweight, regenerative braking rolling stock and baseline driving style versus energy-efficient defensive driving style), generating different power consumption profiles for each. As such, this serves as a proof of the application of the multi-modelling approach and demonstrates a number of benefits for flexible and rapid systems modelling. This paper fills a knowledge gap by demonstrating a potentially valuable tool for future systems-level decarbonisation challenges in urban rail.

A feasibility assessment of multi-modelling approaches for rail decarbonisation systems simulation

“…Further details on the models are available in. 67 In order to enable DSE, two versions of the train model were developed; a standard model based on the Metro rolling stock current characteristics, and a power optimised version, which was light-weighted (from 40 metric tonnes to 35 metric tonnes) and with regenerative braking sub-model. The driver model was also developed in two variants -a baseline driver, and a 'defensive' driver -a driver who was slower in applying power and brake, as is typically exhibited in more energy efficient driving.…”

Development and control of a rail vehicle model to reduce energy consumption and carbon dioxide emissions

“…This was developed as a high-fidelity model where each submodel was created independently and can be easily swapped for another of the same type, similar to functional mock-up units (FMUs). [29][30][31] The components are discussed in more detail below. This is based upon the Hitachi AT300 product family (Class 800, 801 and 802, here denoted as 80x) of trains currently being introduced onto the UK rail network.…”

Integrated Approach for the Assessment of Strategies for the Decarbonization of Urban Traffic

“…They showed that in order to achieve 1.5 • C temperature stabilization, direct actions and transformations in technology and human behaviour are essential. Golightly et al [14] developed a multi-modelling approach for urban rail decarbonization but did not include other transport segments. Küng et al [15] analyzed CO 2 reduction potential of different vehicle fleet compositions, considering different CO 2 intensities of the electricity mix.…”