Abstract
A problem of peak power in DC-electrified railway systems is mainly caused by train power demand during acceleration. If this power is reduced, substation peak power will be significantly decreased. This paper presents a study on optimal energy saving in DC-electrified railway with on-board energy storage system (OBESS) by using peak demand cutting strategy under different trip time controls. The proposed strategy uses OBESS to store recovered braking energy and find an appropriated time to deliver the stored energy back to the power network in such a way that peak power of every substations is reduced. Bangkok Mass Transit System (BTS)-Silom Line in Thailand is used to test and verify the proposed strategy. The results show that substation peak power is reduced by 63.49% and net energy consumption is reduced by 15.56% using coasting and deceleration trip time control.
Highlights
The demand for public transport has rapidly increased around the world
This paper presents a study on optimal energy saving in DC-electrified railway with on-board energy storage system (OBESS) by using peak demand cutting strategy under different trip time controls
This paper presents a study on optimal energy saving in DCelectrified railway system by using OBESS
Summary
The demand for public transport has rapidly increased around the world. Many countries in Asia such as Thailand, Singapore and India have plans to expand the existing routes in their mass transit systems to cover all urban areas [1]. The purposes of the regenerative braking energy management with OBESS are increasing energy efficiency [7,8,9], reducing peak power of substations [10] and stabilizing network voltage [11, 12]. The research presented in this paper is devoted to reducing substation peak power mainly in DC metro systems. [10], a 25% reduction of the overall railway electricity cost was achieved by reducing substation peak power during train. This paper studies the optimal energy saving in DC metro systems using OBESS with peak demand cutting strategy.
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