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A Novel Fault Location Scheme on Korean Electric Railway System Using the 9-Conductor Representation
Changmu Lee,Hansang Lee,Dong-Hee Yoon,Hanmin Lee,Jiyoung Song,Gilsoo Jang,Byungmoon Han 대한전기학회 2010 Journal of Electrical Engineering & Technology Vol.5 No.2
This paper presents a novel fault location scheme on Korean AC electric railway systems. On AC railway system, because of long distance, 40[㎞] or above, between two railway substations, a fault location technique is very important. Since the fault current flows through the catenary system, it must be modeled exactly to analyze the fault current magnitude and fault location. In this paper, suggesting the novel scheme of fault location, a 9-conductor modeling technique including boost wires and impedance bonds is introduced based on the characteristics of Korean AC electric railway. After obtaining a 9-conductor modeling, the railway system is constructed for computer simulation by using PSCAD/EMTDC. By case studies, we can verify superiority of a new fault location scheme and propose a powerful model for fault analysis on electric railway systems.
Field Tests of DC 1500 V Stationary Energy Storage System
Lee Hanmin,Kim Gildong,Lee Changmu,Joung Euijin 한국철도학회 2012 International Journal of Railway Vol.5 No.3
The ESS(energy storage system, here after) for a DC 1500V was developed in 2009. A ESS was installed on the track of Daejeon HRT in 2010. The advantage of the ESS is that it can save the energy and plus stable the catenary voltage. This paper presents the energy saved by the ESS in Daedong substation. When the ESS is on/off, the field tests are performed.
이장무(Lee Changmu),김주락(Kim Joorak),이한민(Lee Hanmin),오세찬(Oh Sechan),김길동(Kim Gildong) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
In case of accidents at the line of Seoul-Pusan high speed railway, high speed train should be operated with making a detour by using existing Seoul-Pusan railroad. For Dae-jeon~Dae-Gu section which has fragile structures, following points are investigated. In operating existing train, train running time is analyzed by the case of only high speed train being in service and the case of high speed train being in service on condition that existing train is operated. Also the possibility about operation on present train headway and train headway that is applicable to operation and vocational problems would be examined.
이장무(Changmu Lee),이한민(Hanmin Lee),김주락(Jurak Kim),김길동(Gildong Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
The more feeding distance of substation is long and travel vehicle increases in feeding section, power supply reaches the limits. And if it exceeds the limit, it causes a serious trouble for train operation. Therefore, it is designed that the number of train increases constantly until 2030. So consistent power supply according to the increasement of vehicle in power system at present Seoul-Pusan high speed railway, regular operation in case of extended feeding occurring accidents in substation, and the least headway scheduled at relevant section and the effects installing compensation facility in case of impossible extended feeding is examined.
Hansang Lee,Hanmin Lee,Changmu Lee,Gilsoo Jang,Gildong Kim 대한전기학회 2010 Journal of Electrical Engineering & Technology Vol.5 No.2
There is an increasing interest in research to help overcome the energy crisis that has been focused on energy storage applications in various parts of power systems. Energy storage systems are good at enhancing the reliability or improving the efficiency of a power system by creating a time gap between the generation and the consumption of power. As a contribution to the various applications of storage devices, this paper describes a novel algorithm that determines the power and storage capacity of selected energy storage devices in order to improve upon railroad system efficiency. The algorithm is also demonstrated by means of simulation studies for the Korean railroad lines now in service. A part of this novel algorithm includes the DC railroad powerflow algorithm that considers the mobility of railroad vehicles, which is necessary because the electric railroad system has a distinct distribution system where the location and power of vehicles are not fixed values. In order to derive a more accurate powerflow result, this algorithm has been designed to consider the rail voltage as well as the feeder voltage for calculating the vehicle voltage. By applying the resultant control scheme, the charging or discharging within a specific voltage boundary, energy savings and a substation voltage stabilization using storage devices are achieved at the same time.
A Study on Energy Saving Analysis by applying Energy Storage Deveice
이한민(Lee, Hanmin),이장무(Lee, Changmu),김길동(Kim, Gildong),정의진(Joung, Euijin) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
This paper presents field tests about the energy saving rate by appling the energy storage device for urban transit system. The tests are performed to know how much energy are saved, on cases that the energy storage device is on/off.