• 한국철도학회논문집
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• 제19권3호
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• pp.297-303
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• 2016

본 논문은 철도차량에 사용되는 보조전원장치(APS)의 고효율화 및 경량화를 위한 방안으로 새로운 철도차량용 보조전원장치의 회로 구조를 제안한다. 제안하는 회로 구조는 기존의 보조전원장치 전력변환 흐름에서 중복 수행되고 있는 전력변환 단계를 단순화 하여, 스위치 소자의 부담을 경감하고 수동소자의 크기를 줄여 전력밀도를 높이는 것을 목적으로 하고 있다. 본 연구에서 제안하는 회로 구조는 기존 철도차량용 보조전원장치에 널리 이용되는 멀티레벨 컨버터를 기본 회로로 하고 있으며, 기존 회로의 1차 측 구조에 커패시터 소자를 추가하여 전력변환 스위치의 소프트스위칭 조건을 용이하게 하는 효과를 얻음과 동시에 추가되는 커패시터를 별도의 저전압 전원소스로 활용하고자 한다. 판토그래프 단에 위치하는 새로운 전원소스를 활용하여 철도차량에 탑재되는 배터리 충전용 컨버터의 에너지를 직접 공급받음으로써, 기존 주 전력변환 컨버터 용량 및 사이즈가 절감되는 효과를 얻을 수 있을 뿐만 아니라 전력변환 단계의 축소로 에너지 변환 효율도 향상되는 효과를 얻을 수 있다. 본 연구에서는 도시철도차량에서 사용되는 보조전원장치의 스펙을 적용하여 제안하는 회로를 디자인하고 타당성을 검증하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 추계학술대회 논문집
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• pp.696-703
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• 2000

This paper describes the capacity calculation of power supply system for light Rail Transit Three factors are considered for the design i.e. substation arrangements, line configuration and substation power capacity. In this study, we considered all of them for capacity calculation of power supply system for LRT. At first DC-fed-traction system is introduced on an outline, a characteristics of train and fed network, and design method of substation arrangements. Optimal design procedures are described, and program for capacity calculation of the system is presented. In addition, the computer simulated results are computed with the conventional simple calculation method.

• 한국전기전자재료학회논문지
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• 제29권4호
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• pp.250-254
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• 2016

Currently, power conversion system which converts AC to DC Power is applied in domestic urban railway. The diode rectifier is used in most of them. However the diode rectifier can not control the output voltage and can not regenerate power as well. On the other hand, PWM (pulse width modulation) converter using IGBT (isolated gate bipolar transistor) can control output voltage, allowing it to reduce the output voltage drop. Moreover the Bi-directional conduction regenerates power which does not require additional device for power regeneration control. This paper compared the simulation results for the DC power supply system on both the diode rectifier and the PWM converter. Under the same load condition, simulation circuit for each power supply system was constructed with the PSIM (performance simulation and modeling tool) software. The load condition was set according to the resistance value of the currently operating impedance of light rail line, and the line impedance was set according to the distance of each substations. The train was set using a passive resistor. PI (proportional integral) controller was applied to regulate the output voltage. PSIM simulation was conducted to verify that the PWM Converter was more efficient than the diode rectifier in DC Traction power supply system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.800-805
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• 2005

In this study, control schemes are proposed for a propulsion system of TTX(Tilting Train eXpress). In developed traction converter, unity power factor control, compensation method of dc link voltage have been applied. Output current of converter contains harmonic ripple at twice input ac line frequency, which causes a ripple in the dc link voltage so that beatless control is developed in inverter system to reduce the pulsating torque current. This system is verified by the system modelling and prototype test.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 추계학술대회 논문집
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• pp.727-732
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• 2000

This paper is on the development of a auxiliary power supply for the coach of Indian Railways. The auxiliary power supply system supplies the power for air-conditioners, air-compressors, lighting equipments, controllers, etc. It converts the input voltage, DC 110V which is supplied from battery, to AC 3${\Phi}$ 415V of 30kVA capacity. This is a low voltage-high current type converter system and largely consists of boost chopper and 3 phase inverter. Adopting a optimal control algorithm and simple power circuit, we realized the more reliable and competitive system for satisfaction of Indian Railway's strict requirement for vibration, temperature and dust. We completed the design, the manufacture and the field test of the system successfully and proved the system performance and reliability as a result of those tests.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.514-520
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• 2010

This paper is about control algorithms that bi-direction DC-DC Converter using Super Capacitor and regenerative power from DC feeding system in train. In order to take advantage of regenerative energy efficient, charge and discharge level value of energy storage system serve as an important factor. Respect to output fluctuations of the substation and catenary voltage changing, we offers Charge-Discharge Auto Level Tuning Algorithms to improve system following of Energy Storage System.

• 전기학회논문지
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• 제60권12호
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• pp.2392-2396
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• 2011

This paper deals with the power integration of large urban railway systems to improve regenerative energy utilization. Current regenerative energy utilization is low because there is no special plan for using this energy. If the railway system is integrated with other railway systems, the efficiency is expected to be improved. Through the case studies, to find the realistic effect of integrated operation, real system for the Seoul Metro lines, especially line 5 and 7, had been applied.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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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.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2018년도 전력전자학술대회
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• pp.632-637
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• 2018

AC 및 DC 전력공급구간에서 모두 주행이 가능한 AC/DC 철도차량은 추진제어장치 내부에 컨버터 및 인버터가 모두 구성되어 있다. 따라서 DC 철도차량에 비해서 구성이 복잡하며 각 전력공급 환경에 적합한 인버터 제어 방법이 요구된다. 본 논문에서는 각 전력공급구간에서 고려되어야 할 사항과 이에 대한 인버터 제어 방법에 대하여 기술하고 서울 1호선 및 4호선 철도차량에 적용한 결과를 분석하였다.

• 전기학회논문지
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• 제65권3호
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• pp.511-519
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• 2016

This paper is proposed control algorithm for the using thyristor of the parallel dual converter for Urban railway power supply in order to return the regenerative power generated by regenerative braking in urban railway train. Conventional control algorithm of Thyristor dual converter for urban railway power supply has voltage variation within a control range of hysteresis band. The purposed control algorithm of the parallel thyristor dual converter is to maintain a constant voltage without voltage variation in accordance with variable load through the Sequential mode change. And the control algorithm need calculating optimum initial firing angle to consider magnitude of the load current slope. For this purpose, Proposed algorithm for sequential conversion mode of the dual converter was verified by applying for the simulation.