Modelling of Railway Electrification with DC Traction Energy Recovery

Chong, Jia Jun (2019) Modelling of Railway Electrification with DC Traction Energy Recovery. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

Railway transportation is identified as one of the most environment-friendly transportation. Nowadays, energy efficiency is an important issue in all sectors. The increasing concern with energy efficiency and energy savings has encouraged the use of regenerative braking to replace the typical resistance brakes. There are a lot of methods have been proposed for the reduction on the railway power consumption and provided optimal results on different scenarios. A key output of this project is aim to modelling the regenerative energy where the recovery rate can achieve a standard requirement and improve its efficiency. The current existing operational electrical network of traction power substation is incorporated with a regenerative braking system is studied and evaluated. This project presents a scheme of Simulation Traction Load focus on modelling and analysis of power flow in the inverting DC substation with the regenerative braking system which is used to recover the kinetic energy during barking and hence reduce the train’s energy consumption. The model of the traction power supply system (TPSS) is implemented using software MATLAB and consists of 2 power substations and 3 passenger stations. The TPSS is modelled by using the standards of a Light Rapid Transit (LRT) railway system as a reference. The velocity of the train is used as the input in this modelling. The regenerative energy has been presented with a mathematical model for result analyzation. A modelling of traction substation with and without the DC traction energy recovery will be carried out to analyze the corresponding load flow of the electrical network. The resulting analysis will be discussed the effect of various parameters on the regenerative energy efficiency such as the mass of the train, the maximum speed of the train and deceleration gradient of the train. The parameters such as maximum speed of train and deceleration gradient of the train that have influences on the output of the recuperate energy should be resulting in the increasing of regenerative energy efficiency. However, it is worth to mention that not all energy can be recuperated during practical case and the amount of energy can be injected into third rail is regarding to the tolerance of the traction system.