Development of emergency self-running train for energy utilization in Stationary Energy Storage System

Impact Assessment of Energy Storage Systems Supporting DC Railways on AC Power Grids

“…Through a similar approach used for the DC feeder, the Vsc value is obtained, by discretizing and solving equations (10) and (11), considering given the ISC value. Both wayside and on-board ESSs are connected to the DC feeder system through a DC/DC power converter with a current feedback control loop.…”

“…The pantographoverhead line provides continuous power for LRV operations, whereas wayside and/or on-board ESSs serve as auxiliary power supply [7]- [8]. Even if the energy efficiency increasing itself could be a valid reason to install ESSs along DC railway systems, additional benefits could be provided by these technologies [9]- [11]. Indeed, ESSs can mitigate high voltage drop caused by an increase of the service level (number of rides within a given time period) or by the introduction of new modern and powerful LRVs [5]- [6].…”

“…Indeed, ESSs can mitigate high voltage drop caused by an increase of the service level (number of rides within a given time period) or by the introduction of new modern and powerful LRVs [5]- [6]. Moreover, ESSs reduce power losses along the track as well as the rating of the traction power substation (TPS) rectifier power devices by lowering the LRV peak power absorption [9]- [11]. ESSs also have a significant impact on reliability; indeed, by reducing the overloading of the track power line and substation, they help to slow down the aging effect affecting TPS power components (transformer mainly).…”

“…ESSs also have a significant impact on reliability; indeed, by reducing the overloading of the track power line and substation, they help to slow down the aging effect affecting TPS power components (transformer mainly). Finally, ESSs characterized by large energy reserves can also become an off-grid traction power supply during emergency operating conditions [11].…”

“…The manager of the railway infrastructure could also be interested in installing ESSs because they reduce high electricity bills due to peak power absorptions [27]. Finally, ESSs could become a smart grid asset capable of providing emergency power or demand response services to the local energy distribution company if the TPS is reversible [11], [28].…”