• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.05a
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• pp.424-426
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• 2007

본 연구에서는 UHF 대역의 측정이 가능한 Cavity 안테나를 이용하여 절연진단기술에서의 적용가능성을 검토해 보았다. 제안된 안테나는 유전체 손실이나 급전라인의 손실이 없는 공기를 매질로 하므로, 고출력에 적합하며 고효율을 가진다. 또한 제작이 용이한 구조를 가지므로 대량 생산 시 많은 장점올 가질 것으로 기대된다. 시뮬레이션을 통하여 Cavity 안테나가 0.3 ${\sim}$ 10[GHz] 대역에서는 -10[dB]이하의 Return loss값을 가지는 측정주파수 대역이 약 2.7 ${\sim}$ 10[GHz]로 나타났으며, 0.3 ${\sim}$ 2.5[GHz]의 대역일 경우는 측정 주파수 대역이 약 0.7 ${\sim}$ 2.5[GHz]으로 나타남으로써 대표적인 전력기기인 GIS(Gas Insulated Switchgear : 가스절연개폐장치)에서 UHF 대역을 이용한 절연진단기술에서 사용하는 주파수 대역에서 사용이 가능함을 확인할 수 있었다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1042-1043
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• 2015

미니트램(Mini-Tram)은 승하차 시간 동안 정거장에서의 무선급전 방식에 의한 급속충전(약, 2분 30초 이내)을 통해 에너지를 공급받으며, 운행 시 차상에 설치된 에너지저장 매체(LIC: Lithium-Ion Capacitor)로부터 전기에너지를 공급받아서 운행된다. 차량에 요구되는 에너지 소모량을 분석하고 이에 맞춰서 저장 매체의 직-병렬 구성 및 전력 변환 장치(Regulator 및 DC-DC 컨버터 등)를 설계하는 것은 전기 구동 차량인 미니트램의 설계에서 매우 중요한 부분이다. 본 논문에서는 미니트램 시스템을 개발하는 과정에서 수행된 에너지공급시스템의 사양 선정을 위한 에너지 소모량 예측과 더불어 이와 관련된 주행저항 및 주행성능 분석에 대해서 다룬다.

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.353-354
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• 2010

일반도로에서 주행 가능한 온라인전기자동차(On-Line Electric Vehicles)에 적용하기 위해 비접촉 자기유도 전력전달 방식의 초박형 급전코일과 집전코일을 개발하였다. 이러한 새로운 구조의 초박형 급집전코일은 코어비용을 대폭 절감하고 공극간격을 크게 해주며 차량 좌우편차를 크게 하여, OLEV가 경제적이면서도 성능이 탁월하게 하였다. 그 결과 양산단가 3억원/km 이하이면 서도 공극간격 17cm 이상, 효율 83%이상, 출력 60kW이상 등을 보여 실용화에 근접했다는 평가를 받고있다. 본 논문에서는 제안된 두 가지 방식 급집전코일의 주요 동작특성을 자기장 시뮬레이션 등을 통하여 검증하였다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.413-414
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• 2006

This study was aimed to verify the stable interruption characteristics between power collector and 3rd rail type conductor rail for the Korean-standardized rubber-tired AGT light rail vehicle. At the test track for the Korean-standardized rubber-tired AGT light rail vehicle, interruption ratios, stresses, vibrations, and contact force variations were measured by test conditions, having various train speed. As the results, it was verified that developed 3rd rail type conductor maintains interruption characteristics, which can supply stable electric power.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.3
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• pp.520-525
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• 2016

In this paper, Characteristic of power conversion unit of a railway vehicles according to contact loss in feeding system that applied impedance of rigid conductor is analyzed. It applied impedance of rigid bar in modeling of electric railway system. Railway vehicles are performed of modeling based on the performance of the electric railway vehicle. Effects of the contact loss in the power conversion unit were analyzed via main transformer of railway vehicle, the input and output voltage characteristics of the converter through contact loss was generated after linking the vehicle with feeding system.

• Proceedings of the KIEE Conference
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• 1998.07a
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• pp.387-389
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• 1998

For the continuous and exact measurement of load impedance of AC power system on the electric railway, this paper presents a method to show the load area to resistance(R)-reactance(X) plane of impedance plane. The load area is presented in terms of impedance which is in the ratio of voltage and current continuously measured and impedance plane indicates the protection area of fault locator. The proposed method is verified its reasonability by computer simulation, and using this method we will develop the power system impedance analyser which is available actual application.

• Proceedings of the KSR Conference
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• 2006.11b
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• pp.1222-1227
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• 2006

These days customers require various things such as multiple train, variable trainset, multiple Auxiliary Power Generator(APG) and so on. Among these, the train with multiple APG is installed with APG in each car. Thus, we control and monitor train installed with multiple APG through the TCMS(Train Control & Monitoring System). The TCMS supervise APG failure status and transmit control data in case of a APG failure or more, so energize or de-energize ESK and LRR. Therefore, we can easily control ESK and LRR which gets hard to control because of multiple APG.

• Proceedings of the KIPE Conference
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• 2010.11a
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• pp.32-33
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• 2010

This paper describes a droop control method for the autonomous operation of DC distribution system using distributed generations and energy storage. The method suppress the circulating current, and each unit could be controlled autonomously without communication system. Detailed model of wind power generation, photo-voltaic generation, fuel-cell generation and battery was implemented with the user-defined model of PSCAD/EMTDC software that is coded with C-language. The simulation and experimental results confirms that the proposed DC distribution system make it feasible to provide power to the load stably and verify effectiveness of the proposed method.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.286-293
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• 2008

DC transit system has been adopted in the metropolitan area, Korea since 1974. EMU in this system always reiterates that acceleration and retardation. When EMU decelerates using electric breaking, regenerative power occurs. Regenerative power can be consumed in vicinity EMC on the same line or in resistor. If DC transit system has inverter for reusing regenerative power, Energy efficiency in DC transit system will be increased. This paper present the developed inverter for regenerative power and its field test. Test result of developed inverter is presented.

• Journal of Digital Convergence
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• v.12 no.11
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• pp.289-298
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• 2014

Recently, the traditional paradigm in railroad technology is changing as more efficient and cost-effective electric vehicle (EV) technologies have emerged. The original concept of PRT (Personal Rapid Transit) proposed in the past has come to be regarded as unrealistic, but its feasibility is improving through the utilization of an EV platform. In particular, battery-powered vehicles pose difficult technical challenges in attempts to achieve reliable and efficient operation. However, based on the inductive power transfer (IPT) technology, the fast charging of supercapacitors with high energy density can contribute to overcoming this technical challenge and promote the transition to electric-powered ground transportation by improving the appearance of cities. This study discusses the development process of a power supply system for PRT, including concept design, numerical analysis, and device manufacturing, along with performance predictions and evaluations. In terms of results, the system was found to meet the performance requirements for power supply modules on a test-bed.