• Title/Summary/Keyword: Rail traction system

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Position Control Scheme of Rail Traction System Based on the BLAC Motor With Disturbance Observer (외란 관측기 기반의 BLAC 전동기로 구동하는 레일 트랙션 시스템의 위치 제어)

  • Cho, Kiwan;Lee, Dong-Hee
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.2
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    • pp.127-134
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    • 2021
  • This study presents an overhang-type rail traction system using dual brushless AC (BLAC) motors with hall sensors. For an accurate position and moving length control of the designed rail traction system, instantaneous position controller using speed reference model and modified disturbance observer for BLAC motor with hall sensor are proposed. The presented speed reference model is designed to satisfy the required performance of 200 mm/s with proper acceleration and deceleration slopes to reduce mechanical vibration. Through the instantaneous speed reference model, instantaneous position and speed errors can be compensated together. Furthermore, the modified disturbance observer for BLAC motors with low-resolution hall sensors can improve the torque and speed control performance. The proposed disturbance observer is based on an actual motor speed. However, the feedback speed information of the hall sensor is not enough for use in the low-speed region. The practical adopted disturbance observer uses an activation speed band to the actual torque controller of the designed rail traction system. The proposed position control scheme is verified by the MATLAB-Simulink model and a practical manufactured traction system. In the computer simulation and experiments, the proposed position control scheme shows advanced control performance.

A Simulation Modeling for Rail Potential and Leakage Current Analysis in DC Traction System (직류 전기철도에서의 레일전위 및 누설전류 해석을 위한 시뮬레이션 모델링)

  • Yoon, Yim-Joong;Lee, Jong-Woo
    • Proceedings of the KSR Conference
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    • 2008.11b
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    • pp.196-201
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    • 2008
  • In DC traction systems, a part of feedback current returning through rails becomes leakage current, illumination on a metal laid underground results from the leakage current to ground. To prevent the leakage current on rails, feedback rails almost have insulated with the ground. Insulation between rails and the ground causes that the earth method changes a isolated method in DC traction systems. the rail potential rise results in the isolated method. the rail potential rise causes an electric shock when a person touches the ground and rolling stock. To decrease the rail potential rise and leakage current, there are methods for reducing the feedback resistance and current of rails, increasing the leakage resistance, decreasing the distance between substations. But it are necessary to forecast and analyze the rail potential and amplitude of leakage current. In this paper, we modeled DC traction systems and feedback circuit to simulate the rail potential and amplitude of leakage current using PSCAD/EMTDC that is power analysis program, forecasted the rail potential and amplitude of leakage current about changing various parameters in the electric circuit. By using the simulation model, we easily will forecast the rail potential and amplitude of leakage current in case of a level of basic design and maintenance in electric railway systems, valuably use basic data in case of system selection.

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Voltage rising simulation due to the ground fault in DC traction system (직류 급전시스템에서의 지락고장에 따른 전압상승 시뮬레이션)

  • Jung, Ho-Sung;Han, Moon-Seob;Park, Young;Chung, Sang-Gi;Kwon, Sam-Young
    • Proceedings of the KIEE Conference
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    • 2008.10c
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    • pp.215-217
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    • 2008
  • DC fraction system can damage human and other facilities due to the rising of rail potential. Therefore the earth fault detection relay protects system using rail potential induced in train operation and ground fault. However the conventional protection system cannot operate due to the fault resistance and might operate unwanted voltage rising due to the other substation ground fault. So this paper models DC traction system using PSCAD/EMTDC and simulates the rail potential rising. We can estimate the rail potential rising in DC traction system through the various simulation.

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Relation between Induced Voltage of Rail and Feeding Line of Wireless Power Transfer System for Railway Application (철도용 무선전력전송시스템의 급전선로와 레일유기전압의 관계)

  • Kim, JaeHee;Park, Chan-Bae;Jung, Shin-Myung;Lee, Seung-Hwan;Lee, Byung-Song;Lee, Jun-Ho;Lee, Su-Gil
    • Journal of the Korean Society for Railway
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    • v.17 no.4
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    • pp.228-232
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    • 2014
  • The magnetic field generated by the feeding line of a wireless power transfer system induces voltage on the rail of a railway system. The induced voltage of the rail can have a bad influence on the track circuit and on safety. This paper simulated three feeding lines to study the relation between the feeding lines and the induced voltage of the rail; it also proposed magnetic field distribution of the feeding line to reduce the induced voltage.

Calculation methods for the rail potential rise and the stray current in the ungrounded DC traction system (비접지 급전시스템에서의 레일전위상승과 누설전류 계산)

  • Chung, Sang-Gi;Park, Hyun-Joon;Kwon, Sam-Young;Bai, Chang-Han
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.631-635
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    • 2006
  • DC traction power system is operated ungrounded to minimize the stray current. This causes rail potential increase and makes hazardous condition to the person in touch with running rails. To prevent the hazardous condition, maximum allowable limits on rail potential rise are set by regulations in advanced foreign countries. In this paper, the simplified calculation methods for the rail potential rise and the stray currents are discussed.

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An Evaluation of Selective Grounding Fault Protective Relaying Technique Performance on the Ungrounded DC Traction Power Supply System (도시철도 직류 비접지 급전계통에서의 선택 지락보호시스템의 성능평가)

  • Jung, Hosung;Kim, Joouk;Shin, Seongkuen;Kim, Hyungchul;An, Taepung;Yun, Junseok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.12
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    • pp.1964-1969
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    • 2012
  • This paper presents to verify the selective grounding fault protective relaying technique for the ungrounded DC traction power supply system. This system selectively blocks fault section when grounding fault occurred. In order to perform this verification, field test facilities have been installed on Oesam substation and Worldcup-Stadium substation, and field test process has been suggested. Also, selective grounding fault protective relaying components and rail voltage reduction device have been tested with the various trial examinations. In order to compare and evaluate performance of the selective grounding fault protective relaying function, field test system was modeled and the system fault simulation results were compared and evaluated with the field test result. Performance of selective grounding fault protective relaying function was evaluated with the above-mentioned process, and the fact that the system recognizes fault section irrespective of insulation between rail and ground and fault resistance from grounding fault.

An Algorithm to Analyze Rail Potential Rise in DC Traction Power Supply System (레일전위상승 분석을 위한 컴퓨터 알고리즘)

  • Chung, Sang-Gi;Kim, Hyung-Chul;Jung, Ho-Sung;Kwon, Sam-Young
    • Journal of the Korean Society for Railway
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    • v.12 no.5
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    • pp.687-693
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    • 2009
  • An algorithm and a computer software are developed for the analysis of rail potential rise. The algorithm is intended to be integrated with the traction power system simulation program. In the algorithm, rail potentials are obtained by two step process. First the injection currents to the negative rail are obtained from load-flow study. In the next step, a network consisting of negative rail and the injection currents are constructed. Leakage resistance to ground are added to the network. And the network is analyzed for rail potentials. A software is developed to verify the validity of the algorithm. The result of the software is compared with the Simulink/SymPower circuit analysis result. The differences between the two results are with the acceptable range. The advantage of this algorithm is that it can be integrated with the existing traction power supply simulation program easily, which usually ignores negative rail's leakage resistance.

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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    • 2001.10a
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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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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.