• 한국전자통신학회논문지
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• 제10권11호
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• pp.1271-1276
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• 2015

최근 발전원가가 높은 도서지역의 디젤발전을 신재생에너지로 대체하는 추세이다. 이에 따라 전라남도는 디젤발전기에 의존하여 섬에 전기를 공급하는 지역을 대상으로 태양광과 풍력 그리고 에너지 저장장치 등을 이용한 친환경에너지원을 통해 전기를 공급하는 에너지 자립섬 조성사업을 추진하고 있다. 하지만 신재생에너지원의 용량 설계는 환경적, 지형적 조건으로 부하에 100%로 대응할 용량의 신재생에너지원을 설치하기란 어렵다. 또한 경제성 있는 하이브리드시스템 최적 구성을 위해서는 설계 단계부터 기후조건과 부하패턴 분석을 통해 시스템 구성요소의 적절한 용량 설계와 효과적인 운영을 고려한 마이크로그리드 설계가 요구된다. 따라서 본 논문에서는 서남해안에 위치한 도서지역 중 300호 이상의 가구수를 갖고 증설이 요구되는 거문도를 대상으로 디젤 발전량 중 40%를 신재생에너지원으로 대치하는 하이브리드 발전시스템을 구성하여 최적조합과 용량산정 그리고 경제성에 대한 연구를 수행하고자 한다.

• 한국생산제조학회지
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• 제22권4호
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• pp.629-634
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• 2013

This study aims to investigate a new structure for a concentrating photovoltaic (PV) module using a III-V compound semiconductor solar cellto solve the problems of existing concentrating PV modules and to explore a concentrating optical system with a flat structure, which shows remarkable advantages in terms of manufacturing cost, installation, and maintenance. This study should greatly contribute toward the development of concentrating PV modules. This study was performed to achieve an improvement in efficiency and economy and to implement an actual product. A new source of renewable energy is the only way in which countries that cannot produce oil can even emerge as an energy power. Therefore, this work can serve as a fundamental study that will help South Korea grow into a country that is a PV power generation force.

• 전기학회논문지
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• 제63권6호
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• pp.752-757
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• 2014

This paper attempts to evaluate the impact of power plant penetration on constraints of a transmission network and proposes a methodology based on risk level, which can evaluate the condition of the network and facilities intuitionally. Furthermore, based on this methodology, RLII(Risk Level Improvement Index) is proposed in order to establish comprehensive TNEP(Transmission Network Expansion Planning) from a viewpoint of ISO(Independent System Operator). In order to verify the proposed methods in this paper, real power systems in Incheon and Shiheung areas, south Korea are applied to the case study.

• 신재생에너지
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• 제8권2호
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• pp.6-13
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• 2012

Due to global warming, the need to secure an alternative resource has become more important nationally. Having very strong current on the west coast with up to 10 m tidal range, there are many suitable site for the application of TCP (Tidal Current Power) in Korea. On the south west regions between many islands that create strong current in the narrow channels. The rotor is one of the essential components which can convert tidal current energy into rotational energy to generate electricity. The design optimization of rotor is very important to maximize the power production. The performance of rotor can be determined by various parameters including number of blades, shape, sectional size, diameters and etc. This paper introduces the multi-layer vertical axis tidal current power system which can be applied to offshore jetties and piers effectively. Various cases of VAT turbine were designed. Specifically, the number of blades and turbine shape are changed in several cases. Also, performance analysis was carried out by CFD.

• 플랜트 저널
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• 제14권2호
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• pp.39-44
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• 2018

본 연구에서는 870 MW 대형 석탄화력 발전소에서 출력을 고정시키고 과잉공기비 조정만으로 통풍계통 안정 및 보일러 효율에 어떠한 변화가 있는지를 분석하였으며 이에 따른 적정 과잉공기비를 선정하였다. 과잉공기비 조정에 따라 공기예열기 압력강하, 유인송풍기 실속여유 등이 변하므로 통풍계통 안정화를 위해 적정 과잉공기비 선정은 반드시 필요하다. 따라서 본 연구에서는 과잉공기비를 통상 운전 값인 1.153에서 운전지침서상의 하한 값인 1.127까지 단계적으로 조정하여 공기예열기 압력강하, 유인송풍기 1차 실속여유, 보일러 효율, 각종 손실 등을 측정하였고 보일러 효율도 동등수준이상으로 유지하면서 통풍계통도 위험수준에서 안전하게 이격시켜 안정화에 기여할 수 있는 적정 과잉공기비를 선정하였다. 적정 과잉공기비는 운전지침서 상의 하한 값인 1.127까지 낮추어 운전하는 것이 바람직하다고 판단된다.

• 정보보호학회논문지
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• 제24권2호
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• pp.295-310
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• 2014

발전소 주제어시스템(DCS, Distributed Control System)은 원격지의 설비를 계통현황에 따라 실시간 조작, 감시 및 운전 효율성을 향상시키기 위해 튜닝을 하도록 구현된 자동화 시스템이다. DCS는 IT 기술의 발전과 함께 점차 지능화, 개방화되고 있다. 많은 전력회사들이 DCS에 설비 관리용 패키지 시스템을 접목하여 예측진단을 통한 유지 보수 및 Risk Management를 실현시키기 위한 투자를 확대하고 있다. 하지만, 최근 해외사례에서 보듯이 원전 전력망 등 국가 주요기반 시설인 산업 제어시스템(ICS)을 마비시키고 파괴할 목적으로 개발된 최초의 사이버 전쟁무기인 스턱스넷이 출현하는 등, 폐쇄형 시스템으로 구성된 발전소 주제어시스템도 점차 외부 공격으로부터 위협의 대상이 되고 있음을 알 수 있다. 높은 수준의 가용성(낮은 고장빈도와 신속한 복구)과 운영 신뢰성의 이유로 10년 이상 장기 사용이 요구되는 발전소 주제어시스템의 경우 전적으로 해외 기술에 의존하고 있고 패치 업데이트 등 주기적 보안관리가 이뤄지지 못해 잠재된 취약점이 노출될 경우 심각한 우려가 예상된다. 본 논문에서는 국내 발전회사에서 사용 중인 Ovation 1.5 버전의 간이 시뮬레이터 환경에서 범용 취약점 분석툴인 NESSUS를 활용하여 인가된 내 외부 사용자의 악의적 행위(모의해킹)를 수행하였다. 이를 통해 취약점 탐지 및 발전소 제어시스템 내 사이버 침해사고 발생 시 효과적으로 대응 할 수 있는 취약점 분석 및 로그분석 방안을 제시하고자 한다.

• 방사성폐기물학회지
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• 제19권2호
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• pp.243-253
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• 2021

In the dismantling process of a reactor coolant system (RCS) piping, a radiation protection plan should be established to minimize the radiation exposure doses of dismantling workers. Hence, it is necessary to estimate the individual effective dose in the RCS piping dismantling process when decommissioning a nuclear power plant. In this study, the radiation exposure doses of the dismantling workers at different positions was estimated using the MicroShield dose assessment program based on the NUREG/CR-1595 report. The individual effective dose, which is the sum of the effective dose to each tissue considering the working time, was used to estimate the radiation exposure dose. The estimations of the simulation results for all RCS piping dismantling tasks satisfied the dose limits prescribed by the ICRP-60 report. In dismantling the RCS piping of the Kori-1 or Wolsong-1 units in South Korea, the estimation and reduction method for the radiation exposure dose, and the simulated results of this study can be used to implement the radiation safety for optimal dismantling by providing information on the radiation exposure doses of the dismantling workers.

• Strategy21
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• 통권43호
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• pp.125-174
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• 2018

The purpose of this paper is to analyze the status of naval arms race in Northeast Asia. To this end, the scope of the research was limited to national security strategies, maritime strategies and naval strengthening of the United States, China, Russia and Japan. The major powers' active maritime strategies and naval arms race give some strategic implications to the Republic of Korea Navy as follows. First, China and Japan, unlike the past, are actively using submarines in offshore waters including the Korean Peninsula. Therefore, the ROK Navy must successfully promote the Jangbogo-III-class submarine, which is currently constructed, and get a nuclear-powered submarine and P-8 MPA capable of long-range and long-time operations to enhance ASW capability. Second, North Korea's current building submarines capable of loading SLBMs and SLBMs are a new threat to the ROK Navy. The current building KAMD, which focuses on terminal phase defense, cannot effectively respond to North Korea's SLBMs and should be converted to a multi-layered defense system including SM-3 at a mid-course phase. Third, as China militarizes the South China Sea, the instability of the South China Sea is growing. Therefore, the ROK Navy should strengthen its maritime cooperation with the regional countries such as Japan and ASEAN navies to protect SLOC. In conclusion, the ROK Navy needs to build a strong naval power to keep in mind that the 21st century naval rivalry in Northeast Asia is accelerating. The navy must do one's best to protect national strategic and vital interests by strengthening cooperation with regional countries. South Korea is also accelerating its defense reforms in accordance with the pattern of future warfare and the ROK Navy do one's best to have a balanced naval capability capable of actively operating in the offshore waters.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2009년도 춘계학술발표대회 논문집
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• pp.37-42
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• 2009

We are in search for many method at 21th century thinking about the environment internationally. One is among them low carbon green city. Consequently this dissertation put a system solar energy key point of low carbon green city and purpose of low carbon green city Besides system and technique about the solar energy best practices try to do the investigation analysis. It's important of low carbon green city's environmental friendly system such as solar heat system, solar power generation, ecological greening, All these systems are connected each other and organize low carbon green city. A solar energy system uses pure energy of the situation directly most among the environmental friendly system. Energy saving and environment-friendly city in the world must do not a choice. However, recognition conversion and infrastructure of the Korea still has not come true. But South Korea and the international best practices is not the same system. But plan to solar city, the concept of green city in Cheongju, Deagu local government. And many meetings are in progress.

• Journal of Electrical Engineering and Technology
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• 제10권4호
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• pp.1492-1501
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• 2015

This paper analyzes the effect of voltage sag on distribution systems due to the connection of Electric Vehicles (EVs). In order to study the impact of the voltage sag on the power system, two scenarios have been selected in this paper. The distribution system and EVs are modeled using the Electro Magnetic Transients Program (EMTP). The numbers of EVs are predicted based on the number of vehicles in distribution system of Seoul. In addition, the number of EVs is set up using real-time traffic in Seoul to simulate Scenario I and II. The simulation results show that voltage sag can occur if the distribution system has more than 30% of the total number of vehicles.