Stuart Hillmansen
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View article: Local and global sensitivity analysis for railway upgrading between hydrogen fuel cell and electrification
Local and global sensitivity analysis for railway upgrading between hydrogen fuel cell and electrification Open
In the field of rail transit, the UK Department of Transport stated that it will realize a comprehensive transformation of UK railways by 2050, abandoning traditional diesel trains and upgrading them to new environmentally friendly trains.…
View article: Prediction of the optimal hybrid train trajectory by using artificial neural network models
Prediction of the optimal hybrid train trajectory by using artificial neural network models Open
This paper presents the development and validation of two artificial neural networks (ANN) models, utilising time and power‐based architectures, to accurately predict key parameters of a hydrogen hybrid train profile and its optimal trajec…
View article: Hybrid railway vehicle trajectory optimisation using a non‐convex function and evolutionary hybrid forecast algorithm
Hybrid railway vehicle trajectory optimisation using a non‐convex function and evolutionary hybrid forecast algorithm Open
This paper introduces a novel optimisation algorithm for hybrid railway vehicles, combining a non‐linear programming solver with the highly efficient “Mayfly Algorithm” to address a non‐convex optimisation problem. The primary objective is…
View article: A techno-economic analysis of ammonia-fuelled powertrain systems for rail freight
A techno-economic analysis of ammonia-fuelled powertrain systems for rail freight Open
All diesel-only trains in the UK will be removed from services by 2040. High volumetric density, rapid refuelling ability, and sophisticated experience in infrastructure and logistics make ammonia a perfect hydrogen carrying fuel for rail …
View article: Development of a smart hybrid drive system with advanced logistics for railway applications
Development of a smart hybrid drive system with advanced logistics for railway applications Open
Fuel Hydrogen cells become nowadays a major candidate to replace the diesel in powering the traction locomotives since they offer low emission of pollutant gases, high efficiency, and flexible modular structure without the need for install…
View article: Techno-Economic Analysis of Hydrogen Storage Technologies for Railway Engineering: A Review
Techno-Economic Analysis of Hydrogen Storage Technologies for Railway Engineering: A Review Open
According to the specific requirements of railway engineering, a techno-economic comparison for onboard hydrogen storage technologies is conducted to discuss their feasibility and potentials for hydrogen-powered hybrid trains. Physical sto…
View article: Comparison of renewable integration schemes for AC railway power supply system
Comparison of renewable integration schemes for AC railway power supply system Open
To achieve the UK net‐zero emissions target by 2050, transformations to decarbonise the energy system will be essential. A transition from generating electricity by burning fossil fuel to renewable energy sources (RESs) is one of the most …
View article: Timetable Optimization and Trial Test for Regenerative Braking Energy Utilization in Rapid Transit Systems
Timetable Optimization and Trial Test for Regenerative Braking Energy Utilization in Rapid Transit Systems Open
Rapid transit systems play a significant role in supporting rapid social and economic development in large cities all over the world. However, the systems consume a large amount of energy, which brings increasing environmental concerns. A …
View article: Cost optimization of multi-mode train conversion for discontinuously electrified routes
Cost optimization of multi-mode train conversion for discontinuously electrified routes Open
Rail decarbonization is a popular topic in the transportation industry. The transition from diesel-fed trains on unelectrified routes to hybrid trains or infrastructure electrification has been widely studied. However, previous studies rar…
View article: Convex Optimization for Fuel Cell Hybrid Trains: Speed, Energy\n Management System, and Battery Thermals
Convex Optimization for Fuel Cell Hybrid Trains: Speed, Energy\n Management System, and Battery Thermals Open
We optimize the operation of a fuel cell hybrid train using convex\noptimization. The main objective is to minimize hydrogen fuel consumption for a\ntarget journey time while considering battery thermal constraints. The state\ntrajectories…
View article: Convex Optimization for Fuel Cell Hybrid Trains: Speed, Energy Management System, and Battery Thermals
Convex Optimization for Fuel Cell Hybrid Trains: Speed, Energy Management System, and Battery Thermals Open
We optimize the operation of a fuel cell hybrid train using convex optimization. The main objective is to minimize hydrogen fuel consumption for a target journey time while considering battery thermal constraints. The state trajectories: t…
View article: Mathematical Modeling for Holistic Convex Optimization of Hybrid Trains
Mathematical Modeling for Holistic Convex Optimization of Hybrid Trains Open
We look into modeling fuel cell hybrid trains for the purpose of optimizing their operation using convex optimization. Models and constraints necessary to form a physically feasible yet convex problem are reviewed. This effort is described…
View article: Convex Optimization of Speed and Energy Management System for Fuel Cell Hybrid Trains
Convex Optimization of Speed and Energy Management System for Fuel Cell Hybrid Trains Open
We look into minimizing the hydrogen fuel consumption of hydrogen hybrid trains by optimizing their operation. The powertrain considered is a fuel cell charge-sustaining hybrid. Convex optimization is utilized to compute optimal speed and …
View article: Addressing the climate challenge
Addressing the climate challenge Open
No abstract available.
View article: Traction Power Substation Load Analysis with Various Train Operating Styles and Substation Fault Modes
Traction Power Substation Load Analysis with Various Train Operating Styles and Substation Fault Modes Open
The simulation of railway systems plays a key role in designing the traction power supply network, managing the train operation, and making changes to timetables. Various simulation technologies have been developed to study the railway tra…
View article: Coordinated Scheduling Strategy for Distributed Generation Considering Uncertainties in Smart Grids
Coordinated Scheduling Strategy for Distributed Generation Considering Uncertainties in Smart Grids Open
Smart grid with great flexibility requirements will not accommodate high proportion of distributed generation with uncertainty in the future. Hence, it becomes indispensable to research scheduling strategy of distributed generation, aiming…
View article: Inverter Operating Characteristics Optimization for DC Traction Power Supply Systems
Inverter Operating Characteristics Optimization for DC Traction Power Supply Systems Open
Compared with energy storage equipment based on supercapacitors, flywheels, or lithium batteries, inverters have obvious advantages in installation space, cost, reliability, and service lifetime. For this reason, regenerative inverters are…
View article: Current closed‐loop control and field orientation analysis of an induction motor in six‐step operation for railway applications
Current closed‐loop control and field orientation analysis of an induction motor in six‐step operation for railway applications Open
In railway traction drive systems, six‐step operation is widely used for motors in a flux‐weakening region. Traditional vector control algorithms in six‐step operation cannot work effectively due to the limitation of a single degree of fre…
View article: Energy consumption and carbon dioxide emissions analysis for a concept design of a hydrogen hybrid railway vehicle
Energy consumption and carbon dioxide emissions analysis for a concept design of a hydrogen hybrid railway vehicle Open
Diesel is the most common energy source used by many railway vehicles globally but it also has an impact on the environment due to carbon emissions from the diesel engine. Railway electrification is an effective way to reduce emissions but…
View article: Optimal Dynamic Analysis of Electrical/Electronic Components in Wind Turbines
Optimal Dynamic Analysis of Electrical/Electronic Components in Wind Turbines Open
Electrical and electronic components are very important subcomponents in modern industrial wind turbines. Complex multimegawatt wind turbines are continuously being installed both onshore and offshore, continuously increasing the demand fo…
View article: Conceptual propulsion system design for a hydrogen‐powered regional train
Conceptual propulsion system design for a hydrogen‐powered regional train Open
Many railway vehicles use diesel as their energy source but exhaust emissions and concerns about economical fuel supply demand alternatives. Railway electrification is not cost effective for some routes, particularly low‐traffic density re…