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전기철도시스템에 에너지저장시스템 적용 해석에 관한 연구
이한민(Hanmin Lee),김길동(Gildong Kim),안천헌(Cheonheon An),장길수(Gilsoo Jang),권세혁(Saehyuk Kwon) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
The energy storage system(ESS) is needed to be developed to use regeneration energy when the vehicle is braking. 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 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. This paper presents effects of energy saving obtained by applying the ESS to Seoul Metro.
이한민(Hanmin Lee),김길동(Gildong Kim),안천헌(Cheonheon An),김영규(Younggyu Kim),김태석(Taeseok Kim) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
The electric railway is a clean and energy saving system, because it requires relatively less energy than automobiles by transporting the same passengers or goods. Six thousands of vehicles are operated on Korean urban transit system. This system is 95% of regeneration system. Especially, the VVVF-Inverter vehicle has a merit of the highest regeneration rate. Energy consumption is 90% for traction and 10% for auxiliary supply. Braking energy is about 40% of energy consumption. Up to 40% 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. 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. Such synchronized braking and accelerating can not be coordinated, the ESS(energy storage system) stores the energy generated during braking and discharges it again when a vehicle accelerates. This paper presents field tests about the energy saving rate of the developed ESS. when the ESS is on/off, energy saving rate of the ESS is tested. The verification test in the field focused on energy saving.