Study of Electric Charge Saving Plan Using High-speed Charging Wireless Railway System

Abstract

Many studies have been performed to reduce electric consumption in railway systems. Due to its low conduction loss and high regenerative braking efficiency characteristics, the ESS powered railway system is chosen as a promising candidate for future railway systems. This paper introduces the ESS powered railway system and analyzes current power charge calculation methods that have been set up by KEPCO (Korea Electric Power Corporation). Based on the analysis, this paper proposes two different power charge reduction methods for the railway system. One is to smooth the peaks of traction energy consumption by supplying additional energy to the grid. The other is to save electric charge by reducing electric energy consumed by the railway during the energy peak time, 2 p.m.~5 p.m., which has highest 'Won/kWh' rates. To verify the effectiveness of the proposed method, the power charge of Seoul Metro Line 2 is recalculated using the method.

Reduction of Electricity Prices Using the Train to Grid (T2G) System in Urban Railway

“…The wireless trains are the ones being operated with an ESS like that of an EV. The KRRI is currently undertaking the development of such vehicles [26,27].…”

“…The railroad industry gives an impetus to the development of the electric railroads, transcending the level of the steam and diesel engines, for the efficient use of energy, as transportation means carrying large quantities of logistics and large numbers of passengers [26]. In the railroad industry, the introduction of the large-capacity ESS strives to establish an environment-friendly railroad system designed to enhance the efficiency of the electric power transmission and harmonize with the surrounding environment [27].…”