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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.
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.
A Study for DC 1500V Railroad System Modeling Using EMTDC
이한상(Hansang Lee),이장무(Changmu Lee),이한민(Hanmin Lee),장길수(Gilsoo Jang) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper is about modeling on 1500V DC electric railroad system. Electric railroad systems have peculiar characteristics against other electric system. The characteristics arc that the railroad systems have electric vehicle loads which arc power-varying and location-varying with time. Because of this load characteristic, the electric railroad system modeling which reflects its own characteristics on EMTDC simulation could not be achieved. However, to reflect load characteristic on EMTDC, this paper suggests electric railroad system modeling by using TPS (Train Performance Simulator) that was developed in Korea Railroad Research Institute. A TPS program has various kinds of input data, such as operation condition, vehicle condition, and power system condition. By these data, TPS calculates mechanical power consumption and location, especially it decide electric power consumption on the basis of the fact that consumed electric and mechanical power are equal. Moreover, on this paper, movement of vehicle is reflected on EMTDC simulation as variation of feeder impedance. Also, an electric vehicle load is modeled as time-varying constant power load model.
전기철도 회생에너지 활용 극대화를 위한 에너지 저장장치 최적 동작 전압 결정 알고리즘에 관한 연구
이한상(Hansang Lee),이한민(Hanmin Lee),이장무(Changmu Lee),장길수(Gilsoo Jang),김길동(Gildong Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.4
In this paper, the optimized charging-discharging scheme for energy storage systems (ESSs) on the railway systems are presented to enhance the energy efficiency around the Korean suburban railway systems. To coordinate the control of ESSs, continuous de railway loadflow analysis considering ESSs has been performed with the real railway operation data. First, the total amount of charged energy with the specific charging voltage is calculated. Then the discharging voltages are calculated with the optimization algorithm to discharge all amounts of charged energy. To verify the effects of the boundary variation, case studies for Seoul Metro Line had been performed. Consequently, the energy efficiency is enhanced and the storage capacity is optimized with the operation boundary optimization algorithm.
9도체 전기철도 모델링을 이용한 고장점 표정 방안 연구
이한상(Hansang Lee),이장무(Changmu Lee),이한민(Hanmin Lee),장길수(Gilsoo Jang),창상훈(Sanghoon Chang) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.11
This paper presents a novel fault location scheme on Korean AC electric railway systems. On AC railway system, because there is a long distance, 40 ㎞ or longer, between two railway substations, a fault location technique is very important. Since the fault current flows through the catenary system, the catenary system must be modeled exactly to analyze fault current magnitude and fault location. In this paper, before suggestion for the novel scheme of fault location, a 9-conductor modeling technique that includes 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 suggest a powerful model for fault analysis on electric railway systems.