• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.16 no.3
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• pp.29-36
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• 2002

Recently, power quality problems in AC high-Speed Railway system have been raised, because heavy train and its higher speed are required in addition to new control system by using the Electronic devices. The installation/operation of the Series Capacitor(SC) has been only a device far voltage drop in power system up to now. However, the sufficient effectiveness of compensating In voltage drop has not been proved yet because of technical limitationf SC, and harmonic resonance is attracting a attention as one of new issues. Several problems are expected such as vocational problems of a traction substation, and overloading caused by a new construction of electric railway and the in transport. Therefore, extension of power feeding the fault in the traction substation should be also considered. So this paper represents the application of TSC-SVC on the electric railway power feeding system as a device of voltage compensation, and the simulations are executed through PSCAD/EMTDC.

• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.1396-1398
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• 2000

국내에서 운용중인 단권변압기를 사용한 단권변압기(Auto-Transformer) 급전계통이 철도청의 경우 상하선을 전기적으로 구분하여 사용하고 있는 반면, 건설중인 고속철도의 경우 상하선을 병렬연결하고 있어 이에 대한 시뮬레이션을 수행하여 전기적인 장단점을 확인하여 향후 급전계통 방식을 선정하는데 기본 안을 제시한다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1605-1606
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• 2015

전기철도차량은 매 순간마다 이동하는 대용량 단상부하로, 전력계통 측면에서 부하의 특성이나, 계통구성의 형태 및 제반현상이 일반 3상 전력계통과 상이한 특성을 지닌다. 이와 같이 3상 전력계통으로 부터 단상 교류로 변환하여 전기차를 운행하는 경우에는 3상 전원측 PCC(Point of Common Coupling)에 불평형을 일으켜, 역상전류를 발생시킨다. 현재는 이를 최소화하기 위해서 종래부터 사용 되어온 스코트 결선 변압기를 사용하고 있다. 하지만 특성상 두 개의 단상 시스템에 걸리는 부하량 및 역율이 동일하지 않을 경우 여전히 3상 전압불평형이 발생된다. 이에 대한 근본적인 대책으로는 급전시스템 재구성 또는 전력 설비 증설 및 보상장치의 적용을 들 수 있으나, 최근에는 전력전자 기술의 발달로 IGBT(Insulated Gate Bipolar Transistor) 소자를 이용한 BTB(Back To Back) 방식의 컨버터를 활용한 사례가 연구되고 있다. 본 논문에서는 전력계통과 전기철도의 연계 목적으로 3상-단상 BTB 모듈형 멀티레벨 컨버터 (Modular Multi-level Conveter, MMC)를 이용한 전기철도 급전 시스템의 기본구조를 제안하고, Mathworks사의 MATLAB Simulink tool를 이용하여 시뮬레이션을 통해 MMC시스템을 검토하고자 한다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.16 no.5
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• pp.53-60
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• 2002

This paper presents exact autotransformer-fed AC electric railroad system modeling using constant current mode, and single-phase STATCOM(Static Synchronous Compensator) which has an effect on electric railroad system. An AC electric railroad is rapidly changing single-phase feeding electric power. To avoid voltage fluctuation under single phase loads, electric power should be received from a large source. The system modeling theory is based on the solution of algebraic. The AC electric railroad load model is nonlinear. Therefore this paper is considered nonlinear load using PSCAD/EMTDC. And the proposed modeling method is considered the line self-impedances and mutual-impedances that techniques for the AC electric railroad system modeling analysis, and that single-phase STATCOM can reliably compensate the voltage drop. In the case study, the allowance range of feeding voltage is 22.5∼27.5 kV, AT-fed AC electric railroad system circuit is analyzed by loop equation both normal and extension modes. The simulation objectives are to calculate the catenary and rail voltages with respect to ground, as the train moves along a section of line between two adjacent ATs. The results show that single-phase STATCOM can reduce the voltage drop in the feeding circuit and improve the power quality at AC electric railroad system by compensating the reactive power.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.8
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• pp.48-54
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• 2010

The AC electrified railway systems have the power quality problems such as the harmonic distortion, the reactive power and the three-phase imbalance because of the electrical load characteristics of locomotives, which are non-linear single-phase. These power quality problems have a bad effect on not only AC electrified railway systems but also other electric systems connected together. The RPQC (railway power quality conditioner) can compensate such power quality problems in the AC electrified railway systems. In this paper, a novel RPQC control method based on SRF (synchronous-reference-frame) control is proposed. The proposed RPQC control method can compensate effectively the harmonic currents, the reactive power and the load imbalance. The validity and the effectiveness of the proposed RPQC control method are illustrated through the simulations.

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.2360-2362
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• 2005

전기철도 분야에서 전자기파에 의한 환경영향 평가는 중요한 요소가 되고 있으며 급전시스템, 신호시스템, 차량시스템 등으로 나누어 각각에 대한 전자기파 환경 영향에 대한 평가에 관한 사항이 연구 중에 있다. 특히 신호시스템 중, AF(Audio Frequency)궤도회로는 철도차량과의 빈번한 통신을 통하여 철도차량 제어에 많은 역할을 담당하므로 잡음에 취약하고 오동작은 사고로 직결되므로 이러한 잡음에 대한 평가는 중요하다 할 수 있다. 본 논문에서는 전기철도차량과 신호시스템 중 AF궤도회로와의 전자기적합성을 입증할 수 있는 고조파 분석을 통한 전도성잡음의 시험 및 평가에 대한 방안을 제시한다.

• 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.

• KIPE Magazine
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• v.8 no.1
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• pp.29-36
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• 2003

• KIPE Magazine
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• v.14 no.5
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• pp.19-24
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• 2009

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.105-106
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• 2008

전기철도에서 전차선은 차량에 직접 전력을 공급하는 설비로서 철도차량 운행 시 전차선의 사고를 예방하는 것은 매우 중요하다. 본 논문은 한국과 영국의 전기철도 전차선로의 안전성을 비교하기 위하여 영국의 전차선 안전성 분석 보고서와 한국의 전차선의 장애사례에 대한 데이터를 검토하였다. 분석한 데이터는 Fault Tree Analysis(FTA) 알고리즘에 적용하여 시스템의 신뢰도를 산정하는데 사용하였다. 이를 통해 전기철도 급전시스템의 사고율을 산정하여 각 요소별 및 전체 시스템의 신뢰도를 산정할 수 있었으며, 이는 유지보수주기 결정, 교체필요 요소의 결정 등에 활용될 수 있을 것으로 판단된다.