April 1, 2015 Thesis Open Access

Mequanint Biazen Ayalew

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    "description": "<p>Addis Ababa light railway is one of the newly constructing railway transport system in Ethiopia. Urban rail plays a key role in the sustainable development of metropolitan areas for several reasons such as its high capacity, energy efficiency and lack of local air pollution. Electricity has become the primary source of traction power in modern railways. DC-electrification is often used for urban public transport.<br>\nMost electric trains in DC-electrified railways are presently equipped with regenerative braking system. Regenerative braking is a means to save energy and reduce maintenance costs in railway industry. Ultra-capacitor is a major promising alternative of energy storage technologies in the urban rail system. Compared to other storage technology, the ultra-capacitor has the advantages of rapid charging and discharging frequencies, a long cycle life and high power density, which highly match the characteristics of urban rail transit such as short running time between stations, frequent accelerating and braking and booming power within a short time.</p>", 
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