• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2007.04a
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• pp.128-133
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• 2007

• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.443-444
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• 2020

비상발전기를 이용한 독립 전원시스템에서 유도전동기를 직입기동 할 경우 큰 돌입전류로 인하여 과대한 발전기 용량이 요구되고 있으며, 이를 개선하기 위해 다양한 소프트-스타트 기동 방법이 사용되고 있다. 본 논문은 비상발전시스템에서 유도전동기 기동 시 발생하는 돌입전류를 저감하기 위해 비상발전기를 이용한 소프트-스타트 기동 방식을 제안한다. 또한 제안된 방식이 타당성을 검증하기 위해 시뮬레이션을 한 결과 제안된 방법을 적용 시 돌입전류가 저감하였다.

• Journal of Advanced Marine Engineering and Technology
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• v.38 no.9
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• pp.1119-1124
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• 2014

This paper describes the emergency situation which occurs in Drilling Rig power system. Especially, we focused on power system transient characteristics on propulsion motor load and generator elimination situation in Drilling Rig operation. We performed numerical simulation and analyzed the result for power system transient stability characteristics on each condition for excitation system and governor control system using ETAP (Electrical Transient Analysis Program).

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1008-1009
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• 2015

An emergency diesel generator system is an independent source of power that supports important electrical systems on loss of normal power supply. AVR(Automatic Voltage Regulator) is a regulator which regulates the output voltage at a nominal constant voltage level. Specially, a power supply for the AVR must be operated at the very wide input range. In this paper, a flyback power supply with very wide input voltage range is proposed.

• Proceedings of the KIPE Conference
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• 2018.07a
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• pp.180-182
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• 2018

직류배전 시스템은 신재생에너지 및 ESS(Energy Storage System)와의 결합으로 높은 에너지 이용효율을 가질 수 있다. 이러한 직류배전 시스템은 기존 교류계통을 통해 구성되며, 다양한 디지털 부하가 연계되므로 교류계통 및 메인 PCS(Power Conversion System)에 문제가 발생했을 때를 대비하여 비상 전력 공급 시스템이 필수적으로 고려되어야 한다. 최근 직류배전에서 비상 전력 공급 시스템으로 큰 관심을 받고 있는 ESS는 초기 설치비용, 용량, 수명 등의 문제로 인해 단일로 비상 전력 공급 시스템을 구성하기에 어려움이 있다. 때문에 기존에 이미 많이 설치되어 있는 비상발전기의 적용이 검토되어야 한다. 본 논문에서는 비상발전기와 ESS를 활용하여 양극성 저압직류배전에서 정전과 같은 사고 상황 발생 시 직류배전망의 전압을 빠르게 안정시킬 수 있는 시스템과 그 운영기법을 제안하였고, PSIM 시뮬레이션을 통하여 타당성을 검증하였다.

• Journal of Aerospace System Engineering
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• v.14 no.5
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• pp.42-48
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• 2020

This research illustrates how the hybrid engine system comprising of a two-cycle reciprocal engine with an integrated generator and a battery is prepared for the design process. The purpose of this research is to increase flight endurance taking advantage of the high energy density of hybrid propulsion systems as well as to cope with current environmental issues by reducing fossil fuel. The hybrid system is designed to offer 6 kW power, and the power can be adjusted by controlling the engine's RPM in accordance with load variations. In addition, the battery is adopted to offer extra electric power that this hybrid system cannot cover, and can function as the main power source in limited time in the case of an emergency situation. Besides that, the generator is directly mounted on an engine crank-shaft, and in turn, they can share the same RPM. Thus, it is hypothesized that this integration method can make a compact design possible by reducing space for the installation in the fuselage of UAVs.

• Journal of the Microelectronics and Packaging Society
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• v.13 no.3 s.40
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• pp.19-26
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• 2006

In this paper, author proposes to a fuel cell generation system used to fire prevention installation at emergency. The proposed system is used with a power source of fire prevention installation in preparation for breaking of commercial power supply at emergency. A part of most power loss of the fuel cell generation system is power converter. And the major losses of power converter are switching losses of power semiconductor switches used to power conversion. This parer is designed with a high efficiency power converter of non isolated type in order to increase efficiency of fuel cell power system. The controlling switches used in power conversion system are operated with soft switching, which is applied to partial resonant method to reduce switching loss. The result is that the fuel cell power system gets to high efficiency. Some computer simulated results and experimental results are confirmed to the validity of the analytical results.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.2036-2037
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• 2008

An Emergency Diesel Generator (EDG) manufactured by a French company Wartsila SACM, is a tandem type engine, consisted of two 10 cylindered diesel engines on each side. Manual provided by the manufacturer states that engine bearing requires inspection every 15 years. However, it is difficult for an inspector to access through a manhole located in the lower compartment of engine. Furthermore, during a routine or scheduled maintenance, it is not possible to disassemble main engine bearing and crank shaft, and perform inspection. Two methodologies are suggested here to resolve the problem. One method is to lift the engine and partially perform the maintenance service, and the other method is to disassemble the engine completely and to perform maintenance service by the manufacturer. Pros and cons of two methodologies were thoroughly compared.

• Journal of Advanced Marine Engineering and Technology
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• v.38 no.2
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• pp.202-207
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• 2014

Recently, the study of energy saving technology of ships begins in earnest, as energy saving policies are performed all around the world. SEMS (Ship Energy Management System) is one of the techniques to increase energy efficiency by applying to a independent system like a ship and offshore. SEMS is composed of Cooling Pump Control System (CPCS), Renewable Energy Emergency Power Control System (REEPCS), Load Control System (LCS), and Heating, Ventilation, and Air Conditioning System (HVACS). SEMS is enable to increase energy efficiency and achieve integrated management through the interlocking of each system. Especially, it is possible to improve the flexibility of the selection of the generator capacity in conjunction with a rechargeable battery and renewable energy. In this paper, SEMS applied rechargeable battery is proposed and simulated. By applying the rechargeable battery, it was confirmed that SEMS applied rechargeable battery can be operated at optimum efficiency of the generator.

• Journal of the Earthquake Engineering Society of Korea
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• v.11 no.3 s.55
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• pp.63-72
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• 2007

The Emergency Diesel Generator (EDG) is a very important equipment for the safety of a Nuclear Power Plant (NPP). In this study, the operating vibration of three kinds of EDG systems was measured. The target EDG systems are Yonggwang 5 unit and Ulchin 2 and 3 units. The Yonggwang 5 and Ulchin 3 unit EDG systems are the same type but the foundation systems are different. One is an anchor bolt type and the other is a spring and viscous-damper type. The purpose of these measurements is for a verification of the vibration isolation effect depending on the foundation system. As a result, It can be said that the spring and viscous damper system of the EDG performed better for the vibration isolation than that of anchor bolt type.