• Journal of Power Electronics
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• 제19권5호
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• pp.1315-1325
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• 2019

Aiming at the negative sequence and harmonic problems in the operation of railway static power conditioners, an optimization compensation strategy for negative sequence and harmonics is studied in this paper. First, the hybrid RPC topology and compensation principle are analyzed to obtain different compensation zone states and current capacities. Second, in order to optimize the RPC capacity configuration, the minimum RPC compensation capacity is calculated according to constraint conditions, and the optimal compensation coefficient and compensation angle are obtained. In addition, the voltage unbalance ${\varepsilon}_U$ and power factor requirements are satisfied. A PSO (Particle Swarm Optimization) algorithm is used to calculate the three indexes for minimum compensating energy. The proposed method can precisely calculate the optimal compensation capacity in real time. Finally, MATLAB simulations and an experimental platform verify the effectiveness and economics of the proposed algorithm.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전력기술부문
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• pp.411-413
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• 2006

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 km 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.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.875-880
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• 2007

Due to increasing demands for environment-friendly railway system, bronze wires with cadmium, which is a potential environmental hazard, have been no longer permitted as messenger wire for electric railway system. One of materials being considered as the replacements is copper-clad steel conductor(CCSC), which is currently used as contact wire for high speed operation in the Japanese shinkansen. However, there have been few studies for the application as messenger wire by the CCSC. This study deals with requirements and performances of the messenger wire stranded by the CCSC, especially for high speed electric railway. And the tentative evaluation items and methods to be specified as the Korean railway standard(KRS) are proposed.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1999년도 추계학술대회 논문집
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• pp.352-359
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• 1999

Polymer stem insulator for an electric railway has been developed in 1995 in Korea. Owing to its excellent electrical and physical characteristics, KT mark was awarded for the developed polymer stem insulator. After new specification of KNR(Korea National Railway) was established, tile evaluation of long-term reliability combined with the improvement of manufacturing process was carried out. In 1998, this polymer stem insulator was installed in commercial electrical railway line. This paper presents the long-term reliability properties of the installed polymer stem insulator compared with conventional insulator. The location of tile installed polymer stem insulator in KNR is also introduced.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 춘계학술대회 논문집
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• pp.47.2-60
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• 2002

전기철도(Electric Railway) 실용화 - 1879년 베를린(Berlin) 산업박람회에서 시멘스 할스케 (Siemens Halske) 회사가 소형 전기기관차로 객차 3량을 속도 12[Km/h]로 견인 운전 전기철도(Electric Railway) 상업운전 - 시멘스 할스케 회사가 1881년에 베를린시 부근의 리히테르펠데(Lichterfelde)에 전기철도를 건설하여 전기차에 의한 일반여객 수송(중략)

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.1613-1614
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• 2015

In this paper, we proposed a DC electric railway system that composed of a 3-phase voltage source converter (VSC) and a bidirectional DC-DC converter. The proposed electric railway system is modeled and simulated to show the feasibility in MATLAB/Simulink.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.682-687
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• 2005

High quality power supplying of power distribution system in electric railway system is the important function. Power feeding system is complicated witch is compose with distribution line, circuit break, protection facilities and so on. Among this components, role of substation is most important for elevation of reliability in electric power system. Therefore, the enhanced reliability considering the preventive inspection, repair work, replacement is necessary. In this study, a proposed the enhanced reliability method through a calculation of fault probability in power feeding system.

• Journal of Electrical Engineering and Technology
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• 제13권3호
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• pp.1398-1406
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• 2018

Owing to the consistent increase in accurate analysis issue for energy consumption of the AC electric railway systems, there is controversy about the adequacy of the present watt-hour metering configuration. Due to the unusual load characteristics and facilities, the discussions have not been active. Therefore, in order to achieve more accurate watt-hour metering for AC electric railway system, this paper proposes numerical formulas for watt-hour metering that reflects the highly-varying characteristics of the railway load and the structural characteristics of the Scott transformer. The proposed formulas have been verified by comparison with site-measured data, and a more suitable metering configuration for AC railway system has been proposed.

• 한국산학기술학회논문지
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• 제14권10호
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• pp.5148-5155
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• 2013

전기철도와 인접하여 병행 설치되어 있는 전기통신선에는 전자유도현상에 의한 유도전압이 발생하여 통신장애 및 안전사고가 발생할 수 있다. 이와 같은 유도장해를 경감시키고 통신신뢰성을 확보하기 위하여, 차폐케이블의 적용과 함께 최근 추진되고 있는 복선전철화에 따른 영향을 검토할 필요가 있다. 본 논문에서는 AT급전방식 전기철도에서 인근 통신선에 유기되는 유도전압에 영향을 미치는 각종 인수 및 산출식을 검토하고, 유도전압 발생 예측치를 시뮬레이션을 통하여 정량적으로 분석하였다. 시뮬레이션 결과, 복선철도에서는 단선철도에 비해 통신선 유도잡음 전압이 18[%] 정도 감소하여 타궤조 효과가 영향을 미치는 것으로 나타났다. 또한, 복선철도를 기준으로, 50% 차폐 통신케이블에서는 유도잡음전압이 1/8로 감소하였으며, 15% 차폐통신케이블에서는 1/15로 감소함에 따라 차폐효과가 크고 유도잡음전압 영향을 최소화할 수 있는 것으로 나타났다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.1384-1389
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• 2004

The primary objective of this paper is to examine the capacity of electrical transmission in electric railway feeding system. Although supply capacity of railway substation are sufficient and there is no accident, due to the electrical transmission limit of feeding line the voltage breakdown may occur when large capacity of electric load at feeding line exist. So, using multi-port analysis model, we draw P-V curve due to the length of feeding line, load, location and power factor of electric locomotive. And through case study, compare measurement result and simulation result