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A Study on Effects of Energy Saving by Applying Energy Storage System  

An, Cheon-Heon (한신공영 SE팀)
Lee, Han-Min (한국철도기술연구원, 차세대전동차연구단)
Kim, Gil-Dong (한국철도기술연구원, 차세대전동차연구단)
Lee, Hi-Sung (서울산업대학교 철도차량시스템공학과)
Publication Information
Journal of the Korean Society for Railway / v.12, no.4, 2009 , pp. 582-589 More about this Journal
Abstract
The energy generated by braking vehicle would simply be converted into waste heat by its braking resistors if no other vehicle is accelerating at exactly the same time. Up to 45% of the tractive power of vehicles capable of returning energy to the power supply can be regenerated during braking and that this energy can be used to feed vehicles which are accelerating at the same time. Such synchronized braking and accelerating can not be coordinated, the ESS(energy storage system, here after) stores the energy generated during braking and discharges it again when a vehicle accelerates. The ESS is able to store and discharge energy extremely quickly, consequently enabling a complete exchange of energy between vehicles, even if they are not braking and accelerating at precisely the same time, as is most frequently the case in everyday service. The energy saving rate is related to the headway. If the headway is long/short, the energy saving goes up/down, When the headway is short, the ESS can not save much regenerative energy. The headway of SeoulMetro line 2 as the worst case is very short in Korea urban transit system. So, the energy saving rate will be very low. If the ESSs are applied to another railway system, we can expect that the effectiveness is better than the results of SeoulMetro line 2. This paper presents effects of energy saving obtained by applying the ESS to SeoulMetro line 2.
Keywords
Energy storage system; Regenerative energy; Energy saving;
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