101 research outputs found
Preliminary analysis for the design of an energy-efficient and environmental sustainable integrated mobility system
No full textUtilization of E-Bus Applied to Urban Lines
No full textElectricity instead of oil for vehicle propulsion will contribute to achieve the European Union targets on CO2 emissions reduction. So, in this paper, the performance of a full electric bus on a fixed route in the city of Milan is analyzed. In particular the study compares the performances of a conventional fuel and an electric bus from the point of view of the energy consumption, charging strategy and avoided harmful emissions. The analysis presented shows that significant benefits can be achieved by employing an electric bus instead of a diesel one, especially in terms of avoided harmful emissions
Public and Micro-Mobility Transportation Modes Comparison
No full textPublic transport and electric vehicles, two-wheeled especially, are expected to constitute a major part of future sustainable transport systems in smart cities. The focus of this paper is to analyze different paradigms of mobility on a fixed route in the center of Milan. The chosen path connects Milan Central station to Milano Bovisa station, a very traffic way. The first part of the paper is based on the analysis of the two most common means of urban transport in Milan: the train and the trolley bus. The comparison is performed in terms of energy consumption, emissions, and costs. In the second part, instead, the focus has been shifted to other means of transport: electric light micro-mobility. Given the increased interest these days in both electric scooters and electric bikes, a preliminary analysis of these two means of transport is carried out. From the results, it is possible to conclude that these types of vehicles represent a sustainable alternative for getting around the city
Protection issues in DC traction system with regenerative braking
No full textThis paper focuses on the issues caused by the regenerative braking on the conventional protection scheme of DC traction systems. The problem is simulated using a subway system based on bilateral power supply mode and its operation under different fault conditions is analyzed. In the work, it is possible to observe that some faults could remain undetected with the conventional overcurrent protection scheme in the presence of trains in regenerative braking
Preliminary analysis for the design of an energy-efficient and environmental sustainable integrated mobility system
No full textThe paper presents a new proposal for the design of a sustainable urban mobility system. Starting from an overview on the worldwide existing solutions and on the future trend, an innovative idea regarding the integration of two urban mobility systems is proposed: a metro transit system in underground and an electric and hybrid vehicles transport system on surface. The integration is aimed at the reduction of energy consumptions and environmental impact and at the optimization of the service thanks to the maximization of the transport bid in time. Moreover the proposed solution guarantees the minimum economic impact as a result of the optimization of the logistic and technological application of the existing electric power plant. The main results about the preliminary energy analysis, that is the basis of the project, are reported
Modeling and Simulation of Railway Network in Compliance with Technical Specifications for Interoperability
No full textThis study aims to the realization of an equivalent model of the electric traction network of Milan, so that the model can be used to evaluate the short circuit currents which can arise in all the traction power substations which supply the entire Ferrovienord railway network. Furthermore, to prove that the operation of the system complies with the Technical Specifications for Interoperability (TSI), the calculation of pantograph voltages in significant points of the network is performed
Solar Powered Micro-grid in Asmara: Model for Sustainable Generation and Distribution
No full textWith the worldwide trend of decarbonization and the increment of the electrification rate, energy production became a primary issue. If from one side developed countries have to face an energetic crisis linked to the leakage of energy sources, other countries have still to face the issue of the access to electricity. In many African Sub-Saharan countries, the access to electricity still represents a critical point to face, in order to develop the region, limiting the life quality development and the Gross Domestic Product (GDP) growth. Thanks to distributed generation, several solutions were implemented for power generation and distribution. The implementation of a micro-grid to electrify the region represents a smart solution due to the simple structure and the modularity, allowing to enlarge it effortless. Moreover, this region benefits of a high solar radiation, making the installation of photovoltaic (PV) panels extremely profitable in terms of energy production. Following these considerations, this work simulates the implementation of a micro-grid, using the software HOMER Pro, largely used for micro-grid simulation, in order to power an electrical system in a Sub-Saharan developing country, Eritrea, where the electrification rate is 76% in the urban areas and 37% in the rural ones. To reach the environmental sustainability target, the micro-grid will be powered by a PV plant, due to the high daily solar radiation of 6 kWh/m2/day, helped by a storage system, in order to realize a 14 MW power plant in 0.28 km2, which is able to overcome the production. In conclusion, this work wants to be the testing ground for future studies of electrification in developing countries, where the integration of micro-grids and renewables can help to solve the issue of access to electricity, always respecting the sustainability trend
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