• Proceedings of the KIPE Conference
• /
• 2017.11a
• /
• pp.99-100
• /
• 2017

무선 급전 경전철 차량은 차량이 역에 도착하였을 때 단시간에 배터리에 에너지 충전을 요구함에 따라 1MW이상의 순간 전력을 공급하는 시스템을 요구하게 된다. 때문에 대용량 파워에 따라 손실의 따른 발열량이 커지게 된다. 때문에 높은 효율을 갖는 제어 방식을 선택하는 것이 불가피하게 된다. 이러한 이유로 본 논문에서는 집전 정류기를 PLL을 통하여 스위칭 지점을 ZVS가 가능하도록 제어하고 또한 스위칭 OFF 손실을 줄이기 위하여 주파수를 4분주로 스위칭 하는 방식을 제한고 이를 실제 하드웨어를 통하여 제어 알고리즘의 타당성을 검증하였다.

• Proceedings of the KIEE Conference
• /
• 2009.07a
• /
• pp.2182_2183
• /
• 2009

최근 화석연료에 대한 에너지의존도가 높아지면서 철도차량분야에서 대체에너지를 도입하기 위한 연구가 이루어지고 있다. 본 논문에서는 지자체를 중심으로 활발하게 진행되거나 검토되고 있는 경량전철 시스템에 대해 대체에너지로 각광받고 있는 태양광 발전시스템에 대한 도입 타당성 검토를 연구하였다. 경량전철 전력설비 계통에 태양광 발전시스템을 연계하고자 했을 때, 검토되어야 할 기술적인 사항 등에 대한 조사하였으며, 특히 태양전지판을 경량전철 노선 벽면에 설치하였을 때 발전량이 확보할 수 있는지에 대한 선행연구를 하였다.

• Proceedings of the KIEE Conference
• /
• 2001.07b
• /
• pp.1251-1253
• /
• 2001

This paper presents on capacity design of DC-fed-traction system. The system is introduced including a characteristics of train, feeding network configuration, and design method of substation arrangements. Optimal design procedures is described, and program for capacity computation of the system is presented using the nodal equation, K.C.L, K.V.L, Ohm's law and superposition theory. For the proof of the proposed algorithm, we accomplished the simulation of DC traction system for HA-Nam LRT. By considering whole component in DC traction system the conclusion will be much precise.

• Proceedings of the KIEE Conference
• /
• 2005.07a
• /
• pp.589-591
• /
• 2005

경량전철 시스템은 1950년대 후반부터 증가하는 운송수요에 대한 대안으로 제시되고 있고, 유연한 노선 계획이 가능한 도시환경 친화적인 첨단 궤도 교통 시스템이다. 본 연구에서는 이러한 차세대 근거리 교통 수단으로 각광받고 있는 경량전철 시스템에 이중화 기술을 적용하여 기존 시스템에 비해 한 단계 높아진 신뢰성을 확보한 전력 SCADA 시스템을 다루고자 한다. 과거 각종 시스템 개발의 초점이 Functionality와 Performance에 있었다면, 무어의 법칙이 말해주듯이 마이크로프로세서를 비롯한 하드웨어, 소프트웨어 및 초속 통신 기술의 발전을 통해 현재의 시스템 개발은 과거의 관심사를 포함하여 안정성 및 신뢰성의 확보가 중요한 관건중 하나이다. 따라서 본 연구에서는 이러한 기술을 토대로 시스템의 중단을 최소화하여 보다 Robust한 전력 SCADA 시스템에 적용된 이중화 기술을 소개하고자 한다.

• Structural Engineering and Mechanics
• /
• v.61 no.3
• /
• pp.427-436
• /
• 2017

This paper presents an experimental and analytical investigation on the behavior of a U-shaped girder subjected to operation, cracking and ultimate loads. A full-scale destructive test was conducted on a U-shaped girder to study the cracking process, load-carrying capacity, failure mechanism and load-deformation relationships. Accordingly, the tested U-shaped girder was modeled using ANSYS and a non-linear element analysis was conducted. The investigation shows that the U-shaped girder meets the specified requirements of vertical stiffness, cracking and ultimate load capacity. Unfavorable torsional effect is tolerable during operation. However, compared with box girders, the U-shaped girder has a more transverse mechanical effect and longitudinal cracks are apt to occur in the bottom slab.

• Proceedings of the KSR Conference
• /
• 2001.10a
• /
• pp.343-349
• /
• 2001

In this study we examined the method to estimate numerically the amount of the regenerated power and the excess regenerated power produced in the DC electric power supply system for the urban light rail transit system. And their economic feasibilities are also studied. For this study DC electric power supply system is simulated and the numerical analysis of the regenerated power and the excess regenerated power are conducted. The study result on the sample system shows that the facility to consume the excess regenerated power or the inverting equipment to reuse the excess regenerated power in the electric substation is feasible economically.

• Proceedings of the KSR Conference
• /
• 2006.11a
• /
• pp.253-269
• /
• 2006

The Maglev Train System in Korea has been developed as a type of Light Rail Transit systems meanwhile. LRT systems which is a type of Urban Railway System, has been standardizing and some of them are prescribed but the Maglev System is not in the law Along with planning the Urban Maglev Train Commercialization Project in recent time additionally, we reviewed the contents of the laws for the commercialization of the system, and emerged the way to revise the relative laws.

• Proceedings of the KSR Conference
• /
• 2000.11a
• /
• pp.32-39
• /
• 2000

It is hard for central and local government, constructor to decide an appropriate system any city, because there are many factors that must considered. So, we considered various factor such as capability, accessibility, usability, durability, serviceability, availability, reliability, dependability, maintainability, etc that used previous research and feasibility study. As more important factors, they should take into consideration prices, a possibility on whether or not technology is applicable for repairing or keeping the system, the localization rate, and all kinds of contracts, when deciding a system. We put in order factors and grouping for interested party. This article present almost factors that be used to decide light railway system, maybe these factor consideration will be helpful for system decider.

• Proceedings of the KSR Conference
• /
• 2007.05a
• /
• pp.1481-1498
• /
• 2007

As railroad industry face the new Renaissance era, effective and efficient maintenance methods for rolling stock operation are required with advanced railroad technology. All kinds of railroad systems such as high speed long distance train, metropolitan mass transit and light rail require systematic maintenance technology in order to maintain the safe railroad operation. Simulation models for detailed operations of the sample maintenance center are developed. In this study, standard maintenance procedures, layout, equipments and number of workers of Siheung Metropolitan Railroad Maintenance Rolling Stock Depot are considered. The proposed simulation models are developed using simulation package ARENA. Three simulation analysis using the developed simulation model are done. First, the bottleneck operation is identified. Second, the relationship between maintenance center size, number of workers and cycle time is analyzed. Lastly, the scheduling performances between PERT/CPM and Critical Chain Project Management(CCPM) are compared.

• Proceedings of the KSR Conference
• /
• 2007.05a
• /
• pp.722-729
• /
• 2007

The methodology for maintenance system development should overall be considered with all of task characteristic, schedule, and the technical condition of investment sources. This research applies Waterfall model to methodology for the development and construction of maintenance system through customizing the CD (Custom Development) procedure of "HSDM (Hyundai System Development Methodology)" based on information engineering. The waterfall model called as classic life cycle paradigm is defined for the sequent development procedure, which make progress a next step after that a previous step is admitted with thorough review. This model which is popular and the oldest paradigm is used for system development by four steps; demands analysis, design, construction, and maintenance. This methodology advances higher abstract step from higher lower step using top-down approach from concept definition to construction, which notices the end of a step whenever a step is over. Therefore, each step is exactly divided, and consequently the output is clearly yielded.