• Title/Summary/Keyword: DC railway

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Development of a Novel Methodology for DC Railway Power Network Analysis Based on Participation Factor

  • Shin, Byoung-Yoon;Jang, Gilsoo;Shin, Seung-Kwon;Joo, Sung-Kwan;Lee, Hansang
    • Journal of Electrical Engineering and Technology
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    • v.12 no.1
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    • pp.478-485
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    • 2017
  • Urban DC railways have played an important role in urban transportation, and railway operation and energy management have been emphasized to be important to achieve maximum efficiency from existing infrastructure. Fast, accurate DC railway power flow analysis is required to operate a DC railway efficiently, and this paper proposes a novel methodology to analyze the DC railway power network by implementing the participation factor (PF). The PF concept consists of a correlation between the vehicle and the substation, as explained using zones based on the position of the vehicles running on the route. Then, the DC railway powerflow is calculated using the PF concept. Finally, the usability of the proposed method was validated via case studies with actual railway operation data, and we discuss some of the advantages of the suggested methodology.

Development an Structure and Control Algorithm of Propulsion Control for Driving Railway Vehicle in Both AC and DC Power Supply Section (AC 및 DC 전력공급구간 운전을 위한 도시철도용 추진제어시스템의 구조 및 제어 알고리즘 개발)

  • Lee, Chang-Hee;Lee, Ju
    • The Transactions of the Korean Institute of Power Electronics
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    • v.24 no.2
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    • pp.84-91
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    • 2019
  • This study proposes a AC/DC railway vehicle control algorithm that enables simultaneous driving of AC and DC power supply sections. In the Seoul metropolitan region, trolley voltage for railway vehicle is divided into AC and DC power supplies. Therefore, AC/DC railway vehicle algorithm is essential for driving on the outskirts of the region. This study analyzes resonance and beat phenomena for simultaneously running in AC and DC power supply sections, and proposes a control algorithm for railway vehicles with the application of damping and beatless controls based on this analysis. The performance of the proposed algorithm is verified by simulation and analysis of actual driving results.

Development and Performance Test of DC Smart Metering System for the DC Power Measurement of Urban Railway (도시철도 직류 전력량 계측을 위한 직류용 스마트미터링 시스템 개발 및 성능시험)

  • Jung, Hosung;Shin, Seongkuen;Kim, Hyungchul;Park, Jongyoung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.5
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    • pp.713-718
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    • 2014
  • DC urban railway power system consists of DC power network and AC power network. The DC power network supplies electric power to railway vehicles and the AC power network supplies electric power to station electric equipment. Recently, because of power consumption reduction and peak load shaving, intelligent measurement of regenerative energy and renewable energy adapted on DC urban railway is required. For this reason, DC smart metering system for DC power network shall be developed. Therefore, in this paper, DC voltage sensor, current sensor, and DC smart meter were developed and evaluated by performance test. DC voltage sensor was developed for measuring standard voltage range of DC urban railway, and DC current sensor was developed as hall effect split core type in order to install in existing system. DC smart meter possesses function of general intelligent electric power meter, such as measuring electricity and wireless communication etc. And, DC voltage sensor showed average 0.17% of measuring error for 2,000V/50mA, and current sensor showed average 0.21% of measuring error for ${\pm}2,000V/{\pm}4V$ in performance test. Also DC smart meter showed maximum 0.92% of measuring error for output of voltage sensor and current sensor. In similar environment for real DC power network, measuring error rate was under 0.5%. In conclusion, accuracy of DC smart metering system was confirmed by performance test, and more detailed performance will be verified by further real operation DC urban railway line test.

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.

Development of Analysis Model for Metro Railway DC Electric Power System (도시철도 DC 급전시스템 해석 모델 개발)

  • Cha, Jun-Min;Kim, Hyung-Chul
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.1411-1417
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    • 2006
  • The DC electric power system is the most important power source in a metro railway system. As metro railway system is expanded recently, the importance of DC electric power system is emphasized. Furthermore, the study for systemization and standardization of design and operation technique in DC electric power system is undergoing nowadays. For these studies, the development of standard analysis model for metro railway electric power system is required. In this paper, a standard analysis model for metro railway electric power system which is using PSCAD/EMTDC program is developed. The developed model is explained and the validity is shown by using the case studies.

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A DC Electric Railway System for Improving Regenerative Energy Utilization (회생에너지 이용률 향상을 위한 새로운 DC 전기철도 급전시스템)

  • Han, Seong-Geun;Yoo, Hyeong-Jun;Kim, Hak-Man;Park, Jae-Se
    • Proceedings of the KIEE Conference
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    • 2015.07a
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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.

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Development of AC/DC Hybrid Simulation for Operator Training Simulator in Railway System

  • Cho, Yoon-Sung;Lee, Hansang;Jang, Gilsoo
    • Journal of Electrical Engineering and Technology
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    • v.9 no.1
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    • pp.52-59
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    • 2014
  • Operator training simulator, within a training environment designed to understand the principles and behavior of the railway system with respect to operator's entries and predefined scenario, can provide a very strong benefit in facilitating operators' handling undesired operations. This simulator consists of computer system and applications, and the purpose of applications is to generate the power and voltage and analyze the AC substation and DC railway, respectively. This paper describes a novel approach to the new techniques for AC/DC hybrid simulation for the operator training simulator in the railway system. We first propose the structure the database of railway system. Then, topology processing and power flow using a linked-list method based on the proposed database, full or decoupled newton-rapshon methods are presented. Finally, the interface between the analysis for AC substation using a newton-rapshon method and the analysis for DC railway system using a time-interval power flow method is described. We have verified and tested the developed algorithm through the extensive testing for the proposed test system. To demonstrate the validity of the developed algorithm, comparative simulations between the proposed algorithm and PSS/E for the test system were conducted.

Regenerative Inverter System for Railway with DC Line Voltage Simulator (직류가선전압 모의장치를 적용한 지하철용 회생인버터 시스템)

  • Ji, Young-Hyok;Cho, Ki-Hyun;Jang, Su-Jin;Won, Chung-Yuen;Kim, Yong-Ki
    • Proceedings of the KSR Conference
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    • 2007.11a
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    • pp.1515-1521
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    • 2007
  • In this paper, a unified regenerative inverter system for railway with DC line voltage simulator is proposed. In order to determine the operation characteristics of the regenerative inverter, the DC line voltage simulator is proposed. The DC line voltage simulator, which is based on the AC-DC PWM converter, varies the DC voltage according to the fluctuating voltage which is measured in the actual DC line. The suitable operating point of the regenerative inverter can be estimated from the simulation result. The regenerative inverter operates two modes. When the DC line voltage exceed the operating point, already set up, it works as regenerative inverter to return the excessive power of DC line to the grid. When the DC line voltage is under the operating point, it works as active power filter to compensate harmonic currents. In this paper, the control algorithm of the DC line voltage simulator and that of the regenerative inverter is proposed.

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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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Analysis of Utilizing Regenerative Energy in Railway System through a DC Power Supply Simulation (DC 급전시뮬레이션을 통한 도시철도 회생에너지 활용 분석)

  • Shin, Seungkwon;Jung, Hosung;Kim, Hyungchul;Park, Jongyoung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.10
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    • pp.1479-1484
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    • 2014
  • This paper deals with regenerative energy in railway system which one of the largest customer in terms of load capability. Unlike the other loads of power system, loads of railway systems change in time and space. It has a characteristic amount of generating regenerative energy by frequent starting and braking in railway system. Therefore, it is expected higher utilization in railway system than the other systems. The purpose of DC power supply simulation is analyzing backed energy, regenerative energy by each railway vehicle and substation. In this paper, regenerative energy utilization are analyzed using DC power supply simulation and it is performed changing major influence on the design such as the number of installing absorber, internal resistance value, no-load voltage value at substation or operating parameters at regenerative energy utilization. After simulating, results are compared and analyzed.