• Title/Summary/Keyword: DC electric traction substation

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Direction for Development of Energy Regeneration Device for DC Electric Railway System (DC전철구간의 에너지회생장치 개발 방향)

  • Kim, Yong-Ki;Bae, Chang-Han;Han, Moon-Seob;Yang, Young-Chul;Jang, Su-Jin
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.804-808
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    • 2007
  • when electric traction system used DC 1500V runs on decline of rail road track and slows down, Dc voltage goes beyond regular voltage. In this case extra power is forcibly wasted by resister because rectifier of substation and electric train including power converter and so on are out of order. This paper described a DC electric railway system, which can generate the excessive DC power form DC bus line to AC source in substation for traction system. The proposed regeneration inverter system for DC traction can be used as both an inverter and an active power filter(APF). As a regeneration inverter mode, it can recycle regenerative energy caused by decelerating tractions and as an active power filter mode, it can compensate for harmonic distortion produced by the rectifier substation. In addition, electric traction system products harmonic current and voltage distortion and reactive power because power converter is used so regeneration inverter normally runs such as active power filter(APF) for improving power quality. From the viewpoint of both power capacity and switching losses, the system is designed on the basis of three phase PWM inverters and composed of parallel inverters, output transformers, and an LCL filter.

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Development of Regeneration Invertor System for DC Electric Railway System (DC전철구간의 회생인버터시스템 개발)

  • Kim, Yong-Ki;Kim, Ju-Rak;Han, Moon-Seob;Kim, Jun-Gu;Yang, Young-Chul
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.505-511
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    • 2008
  • when electric traction system used DC 1500V runs on decline of rail road track and slows down, dc voltage goes beyond regular voltage. In this case extra power is forcibly wasted by resister because rectifier of substation and electric train including power converter and so on are out of order. This paper described a DC electric railway system, which can generate the excessive DC power form DC bus line to AC source in substation for traction system. The purpose of this study was the development of the regenerative inverter system which suppress extra DC-line voltage and regenerate the energy instead of using a resister. That is Developed regenerative inverter system returns the regenerative energy from the DC line voltage to the utility. In addition, the inverter can be compensate the harmonics caused by the power conversion devices used in the DC traction system.

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Modelling Voltage Variation at DC Railway Traction Substation using Recursive Least Square Estimation (순환최소자승법을 이용한 직류도시철도 변전소의 가선전압변동 모델링)

  • Bae, Chang-Han
    • The Transactions of the Korean Institute of Power Electronics
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    • v.20 no.6
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    • pp.534-539
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    • 2015
  • The DC overhead line voltage of an electric railway substation swings depending on the accelerating and regenerative-braking energy of trains, and it deteriorates the energy quality of the electric facility in the DC railway substation and restricts the powering and braking performance of subway trains. Recently, an energy storage system or a regenerative inverter has been introduced into railway traction substations to diminish both the variance of the overhead line voltage and the peak power consumption. In this study, the variance of the overhead line voltage in a DC railway substation is modelled by RC parallel circuits in each feeder, and the RC parameters are estimated using the recursive least mean square (RLMS) scheme. The forgetting factor values for the RLMS are selected using simulated annealing optimization, and the modelling scheme of the overhead line voltage variation is evaluated through raw data measured in a downtown railway substation.

Simulation study of a regenerative inverter for absorption of regenerative energy in a DC traction substation (도시철도직류변전소의 회생전력 흡수를 위한 회생인버터 시뮬레이션)

  • Bae C. H.;Han M. S.;Kim Y. G.;Kwon S. Y.;Park H. J.
    • Proceedings of the KSR Conference
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    • 2005.11a
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    • pp.705-711
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    • 2005
  • In DC traction substation with 12-pulse diode rectifiers, the DC line voltage tends to rise above noload voltage because it can't absorb the regenerative power caused by electric brakes of train. To solve this problem, an IGBT regenerative inverter should be installed and recycles the surplus regenerative power by delivering it. to the supply grid. In this paper, the DC traction substation equipped with a IGBT regenerative inverter is studied using computer simulation. Matlab/simulink is used to simulate the operation of regenerative inverter which injects the regenerative power into the supply grid and stabilizes the DC line voltage. It is confirmed that the high quality regenerative power is delivered to the supply grid thorough computer simulation.

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Simulation study of a grid-connected inverter for absorption of regenerative energy in a DC traction substation (도시철도 직류변전소의 회생전력흡수를 위한 계통연계형 인버터 시뮬레이션)

  • Bae, C.H.;Han, M.S.;Jung, H.S.;Kim, Y.K.;Park, H.J.
    • Proceedings of the KIEE Conference
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    • 2005.10c
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    • pp.279-281
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    • 2005
  • In DC traction substation with 12-pulse diode rectifiers, the DC line voltage tends to rise above noload voltage because it can't absorb the regenerative power caused by electric brakes of train. To solve this problem, an IGBT regenerative inverter should be installed and thus recycles the surplus regenerative power by delivering it to the supply grid. In this paper, the DC traction substation equipped with a IGBT regenerative inverter is studied using computer simulation. Matlab/simulink is used to simulate the operation of regenerative inverter which injects the regenerative power into the supply grid and stabilizes the DC line voltage. It is confirmed that the high quality regenerative power is delivered to the supply grid thorough computer simulation.

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RC Circuit Parameter Estimation for DC Electric Traction Substation Using Linear Artificial Neural Network Scheme (선형인공신경망을 이용한 직류 전철변전소의 RC 회로정수 추정)

  • Bae, Chang Han;Kim, Young Guk;Park, Chan Kyoung;Kim, Yong Ki;Han, Moon Seob
    • Journal of the Korean Society for Railway
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    • v.19 no.3
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    • pp.314-323
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    • 2016
  • Overhead line voltage of DC railway traction substations has rising or falling characteristics depending on the acceleration and regenerative braking of the subway train loads. The suppression of this irregular fluctuation of the line voltage gives rise to improved energy efficiency of both the railway substation and the trains. This paper presents parameter estimation schemes using the RC circuit model for an overhead line voltage at a 1500V DC electric railway traction substation. A linear artificial neural network with a back-propagation learning algorithm was trained using the measurement data for an overhead line voltage and four feeder currents. The least square estimation method was configured to implement batch processing of these measurement data. These estimation results have been presented and performance analysis has been achieved through raw data simulation.

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.

A study on energy regeneration of power supply for DC electric traction system (직류전철용 전력공급 장치의 에너지희생에 관한 연구)

  • Bang Hyo-Jin;Jang Su-jin;Song Sang-Hun;Won Chung-Yuen;Kim Yong-Ki;Ahn yu-Bok
    • Proceedings of the KIPE Conference
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    • 2004.07a
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    • pp.439-442
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    • 2004
  • This paper described a dc power system, which can generate the excessive do power form do bus line to ac source in substation for traction system. The proposed regeneration inverter system for dc traction can be used as both an inverter and an active power filter(APF). As a regeneration inverter mode, it can recycle regenerative energy caused by decelerating tractions and as an active power filter mode, it can compensate for harmonic distortion produced by the rectifier substation.

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Improving the capability of energy regeneration inverter for dc electric traction system (직류전철용 에너지 회생장치 성능개선)

  • Bang, Hyo-Jin;Kim, Yong-Ki;Jang, Su-Jin;Song, Sang-Hun;Ahn, Kyu-Bok;Won, Chung-Yuen
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2004.05a
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    • pp.104-109
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    • 2004
  • Recently, when electric traction system used DC 1500[Vdc] runs on decline of rail road track and slows down, dc voltage goes beyond regular voltage. In this case extra power is forcibly wasted by resister because rectifier of substation and electric train including power converter and so on are out of order. Therefore this paper proposes that the extra power is regenerated through regeneration inverter to AC utility in result this system obstruct to go beyond regular voltage and improve the efficiency. In addition, electric traction system products harmonic current and voltage distortion and reactive power because power converter is used so regeneration inverter normally runs such as active power filter(APF) for improving power quality.

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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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