• Title/Summary/Keyword: 전기철도 급전시스템

Search Result 86, Processing Time 0.02 seconds

Development of Regenerative Inverter for Electric Railway Using Space Vector PWM (SVPWM을 이용한 전기철도용 회생 인버터 개발)

  • 백병산;정문구;김태완
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.9 no.2
    • /
    • pp.97-104
    • /
    • 2004
  • As a device that returns surplus energy, regenerated from trains to d.c. source, to a.c. system and reuses it, the thyristor Inverter has been widely used. Because the conventional thyristor inverter is a unidirectional phase-controlled device, it Is Impossible to control the power factor of its output. Moreover, harmonics emission is high and it needs to take a additional filter. In this paper, to solve the problems stated above, the inverter, which can control real and reactive power by adopting IGBT modules as switching elements and being controlled by means of space vector PWM, is developed. Considering high economical efficiency and reliability in order to apply to the system for commercial use, the developed inverter is equipped with fully digital control system and low pass filter, and reduces harmonics and has compact size. The detail description about the developed inverter is stated in various respects: design criteria, technical description, power circuits, control techniques, the developed system, test results, etc.

BESS Application to Voltage Compensation of AC Railway System based on 3ϕ/1ϕ BTB Voltage Source Converter (3상/단상 BTB 전압형 컨버터 기반의 전기철도 급전 시스템의 전압제어 향상을 위한 BESS 적용)

  • Yoo, Hyeong-Jun;Shin, Seungkwon;Jung, Hosung;Kim, Hak-Man
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.63 no.11
    • /
    • pp.1588-1593
    • /
    • 2014
  • The scott transformer changes three-phase power to two single-phase power. However, this method causes unbalance and fluctuation of voltage by the change of electric railload. Recently, the AC railway system based on $3{\Phi}/1{\Phi}$ back-to-back (BTB) voltage source converter (VSC) has been proposed to solve these problems. Meanwhile, battery energy storage system (BESS) is used to compensate voltage instantaneously in power system. In this paper, BESS application to the AC railway system based on $3{\Phi}/1{\Phi}$ BTB VSC is suggested to compensate voltage instantaneously. The application effect is shown through simulation using MATLAB/SIMULINK.

The Modeling of Hybrid Railway Vehicle Power System Using Fuel Cell and IPT System (연료전지 및 유도급전 시스템을 이용한 하이브리드 철도차량 시스템 모델링)

  • Han, K.H.;Jang, H.Y.;Kwon, S.Y.;Park, H.J.;Lee, B.Y.;Baek, S.H.
    • Proceedings of the KIEE Conference
    • /
    • 2008.07a
    • /
    • pp.1038-1039
    • /
    • 2008
  • This paper proposes a base models of Hybrid railway vehicle power system. A powered system with fuel cell is regarded as a high current and low voltage source. The design parameters of the system should be chosen by taking into account the characteristics of the fuel cell, so the costs of the power system at given operating conditions can be reduced. Currently, no integrated simulation has been approached to analyze interrelated effects. Therefore, the base models of power conversion system with a PEM fuel cell/IPT system for hybrid powered system that includes the PEM fuel cell stack, DC/DC converter are developed. Concept of bidirectional converter for super capacitor charging system is presented.

  • PDF

Probabilistic Method for The Harmonic Analysis of Railroad Feeding System (철도급전시스템의 고조파 평가를 위한 확률론적 방법)

  • Lee, Seung-Hyuk;Song, Hak-Seon;Lee, Jun-Kyong;Kim, Jin-O
    • The Transactions of the Korean Institute of Electrical Engineers A
    • /
    • v.55 no.9
    • /
    • pp.384-391
    • /
    • 2006
  • The harmonic currents generated along with the operating speed of electrical railroad traction are very difficult to analyze because of its nonlinear characteristics. This paper therefore presents probabilistic approach for the evaluation of harmonic currents about the operating speed of the arbitrary single traction. To use probabilistic method for railroad system, PDF(Probability Density Function) using measuring data based on the realistic h 따 monic currents per operating speed is calculated. Measuring data of harmonic current per operating speed is obtained using the result data of PSCAD/EMTDC dynamic simulation based on an IAT(Intra Airport Transit) in Incheon International Airport. The means(expected values) and variances of harmonic currents of single traction also are obtained by the PDF of the operating traction speed and harmonic currents. The uncertainty of harmonic currents can be calculated through the mean and variance of PDF. The probability of harmonic currents generated with the operating of arbitrary many tractions is calculated by the convolution of functions. The harmonics of different number of tractions are systematically investigated to assess the TDD(Total Demand Distortion) for the railroad system. The calculation of TDD was carried out using Monte-Carlo Simulations(MSCs) and the results of TDD evaluation of the power quality in the IAT power feeding system.

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
    • /
    • v.61 no.12
    • /
    • pp.1964-1969
    • /
    • 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.

Serviceability Assessment of a K-AGT Test Bed Bridge Using FBG Sensors (광섬유 센서를 이용한 경량전철 교량의 사용성 평가)

  • Kang, Dong-Hoon;Chung, Won-Seok;Kim, Hyun-Min;Yeo, In-Ho
    • Journal of the Korean Society for Nondestructive Testing
    • /
    • v.27 no.4
    • /
    • pp.305-312
    • /
    • 2007
  • Among many types of light rail transits (LRT), the rubber-tired automated guide-way transit (AGT) is prevalent in many countries due to its advantages such as good acceleration/deceleration performance, high climb capacity, and reduction of noise and vibration. However, AGT is generally powered by high-voltage electric power feeding system and it may cause electromagnetic interference (EMI) to measurement sensors. The fiber optic sensor system is free from EMI and has been successfully applied in many applications of civil engineering. Especially, fiber Bragg grating (FBG) sensors are the most widely used because of their excellent multiplexing capabilities. This paper investigates a prestressed concrete girder bridge in the Korean AGT test track using FBG based sensors to monitor the dynamic response at various vehicle speeds. The serviceability requirements provided in the specification are also compared against the measured results. The results show that the measured data from FBG based sensors are free from EMI though electric sensors are not, especially in the case of electric strain gauge. It is expected that the FBG sensing system can be effectively applied to the LRT railway bridges that suffered from EMI.