• Title, Summary, Keyword: Traction power supply system

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A Study of Traction Power System Reliability (철도 급전시스템 신뢰도 평가 연구)

  • Kim Hyungchul;Cha Jun-Min;Kim Jin-O;Han Moonseob
    • Proceedings of the KSR Conference
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    • pp.806-812
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    • 2005
  • This paper proposes a new reliability evaluation for traction power system. The electric railway consists of traction power systems, various vehicles, operating equipment, track, overhead line and electric equipment. It is a fundamental function of traction power systems that supply customers with reasonable price, acceptable reliability and high quality power. In a general way, the power system reliability deals with the ability to satisfy load demands in supply capability or rating of every factor. On the other hand, the reliability of traction power systems has been focused on train time delay caused by power outage. In this paper, we make a selection optimum reliability indices for the reliability evaluation of electric traction power systems. The reliability study not only applies a plan for traction supply system after detecting the vulnerable point of existing traction supply systems but also makes a role in stable operating railway.

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A Study on Power Flow Analysis of DC Traction Power Supply System with PWM Rectifier (PWM 정류기를 적용한 직류급전시스템의 조류계산에 대한 연구)

  • Kim, Joorak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.11
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    • pp.1919-1924
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    • 2016
  • In general, Diode rectifier has been applied to DC traction power supply system. Diode has some characteristics which is voltage drop in inverse proportion of load because of non-controlled switch, and cannot flow a current in reverse bias. So, voltage drop occurs frequently, and regenerated power cannot use in substation. The PWM rectifier is able to control output voltage constantly to reduce voltage drop and to use regeneration power without additional inverter. This paper proposes analysis algorithm for DC traction power supply system with PWM rectifier.

Investigation of Fault Current and Impedance according to Autotransformer Tap Changing (교류급전시스템의 단권변압기 탭변환에 따른 고장전류 및 고장임피던스 검토)

  • Kim, Joo-Rak;Han, Moon-Seob;Chang, Sang-Hoon;Kim, Jung-Hoon
    • Proceedings of the KIEE Conference
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    • pp.1167_1168
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    • 2009
  • This paper presents new configuration of a.c. traction power supply system. The proposed system includes autotransformer with variable tab. The voltage drop in traction power supply system can be reduced due to tap change of autotransformer. In this paper, fault current and Impedance is investigated, when fault occurs in traction power supply system.

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A Phase-shifter for Regulating Circulating Power Flow in a Parallel-feeding AC Traction Power System

  • Choi, Kyu-Hyoung
    • Journal of Electrical Engineering and Technology
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    • v.9 no.4
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    • pp.1137-1144
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    • 2014
  • A parallel-feeding AC traction power system increases the power supply capacity and decreases voltage fluctuations, but the circulating power flow caused by the phase difference between the traction substations prevents the system from being widely used. A circuit analysis shows that the circulating power flow increases almost linearly as the phase difference increases, which adds extra load to the system and results in increased power dissipation and load unbalance. In this paper, we suggest a phase shifter for the parallel-feeding AC traction power system. The phase shifter regulates the phase difference and the circulating power flow by injecting quadrature voltage which can be obtained directly from the Scott-connection transformer in the traction substation. A case study involving the phase shifter applied to the traction power system of a Korean high-speed rail system shows that a three-level phase shifter can prevent circulating power flow while the phase difference between substations increases up to 12 degrees, mitigate the load unbalance, and reduce power dissipation.

Development of Integrated Simulator for AC Traction Power Supply System (윈도우즈 기반의 교류 전기철도 급전시스템 통합 시뮬레이터 개발)

  • Kim, Joo-Rak;Kim, Jung-Hoon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.1
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    • pp.76-81
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    • 2010
  • This paper describes the development of integrated simulator with GUI(Graphic User Interface) for traction power supply system. This simulator consists of a lot of calculation modules such as TPS, train time schedule, line constant, and power supply system analysis. Each module has input and output structure respectively. The algorithms of all modules have confirmed the validity to comparison with field test that is performed on both high speed railway line and conventional line.

Effects of the Common Earth Network on the Traction Return Current in $2{\times}25 kV$ Power Supply System ($2{\times}25 kV$급전 방식에서의 공동 접지망 적용에 따른 귀선 전류의 영향)

  • Kim, Yong-Gyu;Ryu, Chang-Geun
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.9
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    • pp.509-514
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    • 2002
  • The aim of this research is to find out how the common earth network affects the level of the traction return current in the $2{\times}25 kV$ Power Supply System. The traction return current plays a significant role in the operation of the facilities near the rails. It is shown that the common earth network in the $2{\times}25 kV$ power supply system not only minimizes the level of the traction return current, but also increases the safety of the working crew on the railways. In order to determine the relationship between common earth network and the traction return current, we investigated the earth system of the Gyongbu High Speed Line that is constructed following the SNCF regulations. We carried out the field test in the Osong station. The results of the test show that the common earth network minimizes the effect of the traction return current. We also find that the simulated results are very similar to the test results. We concluded that the results of the test can be applied for the rest of the Gyongbu High Speed Line under construction.

Modeling and Simulation Reactive Power Compensator using Multi-port Network Algorithm in Electrified Railway (다단자망 알고리즘을 이용한 급전시스템의 무효전력 보상 모델링 및 시뮬레이션)

  • Kim, Joorak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.5
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    • pp.883-887
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    • 2016
  • The power supply system in Korean electrified railway has adopted AT feeding. If a fault occurs in some substation for any reason, the vicinity substation must feed electric power on the outage substation through catenary. So, the feeding distance grows twice of the normal state at extended feeding condition. If substation's feeding distance is longer than normal condition, the catenary impedance and train to supply electric power from the substation. Therefore, the severe voltage drop can occur and power supply shall be not allowed. This paper presents the model of compensator against voltage drop using multi-port network algorithm. Whole traction power supply system can be analyzed with this model. Computer simulation including this model is performed based on real train schedule and increased schedule in case studies.

Design and Assessment of DC Traction Power Supply System for Light Rail Transit (직류 전기철도 시스템의 변전소 설계 및 평가)

  • Baek, Byung-San;Moon, Jong-Fil;Choi, Joon-Ho;Kim, Jae-Chul
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.4
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    • pp.86-97
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    • 2006
  • For the design of DC traction power supply system at new Light Rail Transit(LRT) construction, it is very important to determine system configuration, location and power capacity of substation. However, a LRT system consists of a number of subsystems such as train movement, power supply and traction drives, which inevitably contains many complexities and diversities. The objective of this paper is to clarify and systematize the design procedure and its assessment for the electrification system of a LRT line. This paper discusses in detail our approach to system design and its assessment. The whole DC-feeding network configuration, characteristics of a train, and design method of substation arrangements is thoroughly investigated for the design. As a result of the investigations, the design procedure is clarified and systematized and a computer program for the design and evaluation of the system is developed using the most suitable iterative method with nodal equation. To verify the proposed design and its assessment procedure, case studies for the DC traction power supply system of a planed Korean LRT line are performed.

The Computer Algorithm for DC Traction Power Supply System Analysis Including Regenerative Braking Vehicles (회생차량을 포함한 급전시스템 해석 알고리즘)

  • 정상기;이승재
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.11
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    • pp.639-646
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    • 2003
  • Nowadays traction motors in the urban rail transit vehicle are controlled by VVVF inverter and have capability of regenerative braking. The algorithms to deal with the regenerating vehicle in simulation for the DC traction power supply is introduced in this paper. Substations have to be separated from the system to represent reverse biased rectifiers in substations. The model of the trains in regenerative braking has to be changed from the ideal current source to the constant voltage source since the train input voltage has to be controlled below the certain train maximum voltage. Some mismatches are unevitable because the constraint of the regenerated power can not be imposed with the constant voltage source. The mismatches represent the unused regenerated power. A computer program is developed to verify the validity of the algorithm. The test run result shows the program behaves as it is expected and proves the algorithm's validity.

The design of the traction power supply for the test line of Light Rail Vehicle (경전철 시험선용 전력공급시스템 설계)

  • 김국진;백병산;전용주;정상기;김남규
    • Proceedings of the KSR Conference
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    • pp.322-328
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    • 2001
  • In the electric railway systems, it is very important that we should design the system configuration, location and power capacity of substation. This paper presents the results of system configuration and system design of the DC traction power supply for the test line of Light Rail Vehicle. The voltage fluctuation of train and the power capacity of substation are calculated by computer simulation using the nodal equation, K.C.L/K.V.L, Ohm's law and superposition theory.

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