Capacity Design And Evaluation Of Energy Feedback System In Dc Rail Transit System

In the wake of massive 21^st Century technological advancements and developments allied with a massive increase in global population density,several problematic issues have arisen.One of such issues is the negative burden our environment has had to bear due to some of these breakthroughs in human advancements,developments in science and technology.Therefore,in a bid to save our planet's natural resources and counteract certain phenomena such as unused energy emissions and global warming,techniques for saving energy and improving environmental characteristics are of utmost importance to scholars and researchers.For a vastly populated country like the People's Republic of China this environmental challenges are mainly posed in the area of public urban transportation.There's a need for more environmental-friendly forms of transportation and the urban rail transit networks are the most vital in this regard.Ease of public transportation while promoting energy conversion and reducing emission to foster green transit systems is a focus of the Governmental transportation authorities.These factors are why urban rail systems are an adequate solution to reduce traffic congestion and reduce air pollution in urban areas.The urban railway is a kind of transportation which is expected to reach the 6000km total mileage of urban rail transit operation in 2021.The urban railway is clean,fast and safe and does not occupy urban land area.Based on a soon-to-be implemented urban rail line of a major south-western Chinese metropolitan city,this paper analyzes energy feedback system installed on the line with emphasis on energy feedback utilization capacity.But being guided by an understanding that any worthwhile engineering development must strive to achieve operational as well as practical cost efficiency,this work employs in its analysis a comparative study of the capacity as well as cost of installation of the Energy Feedback system.The urban rail capacity design of inverter feedback device is calculated according to the energy use of indicators and determining the working current conditions of each device.The capacity of inverter feedback device is designed and evaluated and then simulation is carried out in the DCTPS platform and applied to the research application case study to verify the feasibility of the design.The energy saving and feedback analysis are carried out firstly based solely on the Energy Feedback Device?EFD?and later on consideration of the whole energy saved in the entire line system is done and comparatively analyzed.The guiding indexes used in this paper include;traction energy,feedback energy,price analysis,duty cycle and ratio,reverse power and actual saved energy.