• 대한전기학회논문지:전력기술부문A
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• 제54권11호
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• pp.507-517
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• 2005

This paper presents the results of critical contingency analysis for the Korean power system which is performed to identify the impact of the critical contingencies on the Korean power system and set up a short term system operation planning for the purpose of preventing large scale blackout. The static and dynamic simulation is carried out for each critical contingency and the simulation results for each contingency are shown under the peak load condition for the year 2005, 2007 and 2010.

• 시큐리티연구
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• 제10호
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• pp.387-407
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• 2005

정보통신의 기술 발달로 인하여 국가안보와 직접적으로 관련된 국가사회의 주요인프라인 에너지 기반구조, 물류 기반구조, 금융 기반구조, 생활필수 기반구조가 상호 연결되면서 상호의존성이 크게 증가하고 있다. 국가기반구조가 정보통신 기반구조와 밀접하게 연결되면 다양한 정보서비스를 제공하는 긍정적인 측면과 더불어 새로운 위험요인을 내포하게 된다. 그러나 지금까지의 현대정보사회의 기술위험에 관한 논의는 원자력 사고, 화재, 교통재해, 가스안전사고 등 공중에게 직접적인 피해를 입히는 1차적 위험요소에 초점을 두고 있었던 반면, 그것 자체가 직접적인 위험요소는 아니지만 일단 사고가 발생하면 정보통신 기술의 발달로 인해 이루어진 국가기반구조 전반에 대한 운행(operation)을 저해하고 제반 위험관리기능을 마비시킴으로써 보다 광범위한 위험을 발생시킬 수 있는 제2차적인 위험요소에 대한 연구는 별로 없었다고 할 수 있다. 사회의 모든 부문에서 자동화와 정보화가 진행될수록 전기에 대한 의존이 커지는 이른 바 ‘전력화현상(electrification)'이 심화되고 있음을 감안할 때, 정보사회의 안보(安保)(security) 저해요소로서의 정전의 중요성이 갈수록 높아진다고 하겠다. 따라서 대규모 정전사태의 문제는 국가위기관리 차원에서 효과적으로 다루어야 하며 정보사회로의 진전이 급속도로 이루어질수록 대규모 정전사태에 대비한 관리체계가 매우 중요하다고 하겠다. 여기에서는 지금까지 발생한 대규모 정전사태의 사례를 분석하고 발생 원인을 심층적으로 살펴본 다음 한국의 정전관리체계를 국가위기관리 단계인 예방(완화 및 대비), 대응, 복구(보상) 단계에 대대 각각 조사해보았다. 결론에서는 보다 나은 효율적인 정전관리체계 수립을 위한 정책적 제안으로 전력의 안전공급체제 견지, 비상전원 설치에 대한 정책적 지원, 정전피해보상제도 개선 등을 제시하였다.

• 대한전기학회논문지:전력기술부문A
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• 제54권10호
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• pp.475-479
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• 2005

Nowadays large-scale blackout was occurred in many developed countries. The do-regulation and competition in power industry might have an effort on the disaster. The demand response algorithm for protecting it is needed, and developed introducing the concept of transient stability by nonlinear transition matrix. Two case studies are carried out.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 A
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• pp.150-152
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• 2004

Nowadays large-scale blackout was occurred in many developed countries. The dereguration and competition in power industry might have an effort on the disaster The demand response algorithm for protecting it is needed. and developed introducing the concept of transient stability by nonlinear transition matrix Two case studies are carried out.

• Nuclear Engineering and Technology
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• 제48권4호
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• pp.881-892
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• 2016

Following the Fukushima accident and its extended station blackout, attention was brought to the importance of the spent fuel pools' (SFPs) behavior in case of a prolonged loss of the cooling system. Since then, many analytical works have been performed to estimate the timing of hypothetical fuel uncovery for various SFP types. Experimentally, however, little was done to investigate issues related to the formation of a flammable gas mixture, distribution, and stratification in the SFP building itself and to some extent assess the capability for the code to correctly predict it. This paper presents the main outcomes of the Experiments on Spent Fuel Pool (ESFP) project carried out under the auspices of Swissnuclear (Framework 2012-2013) in the PANDA facility at the Paul Scherrer Institut in Switzerland. It consists of an experimental investigation focused on hydrogen concentration build-up into a SFP building during a predefined scaled scenario for different venting positions. Tests follow a two-phase scenario. Initially steam is released to mimic the boiling of the pool followed by a helium/steam mixture release to simulate the deterioration of the oxidizing spent fuel. Results shows that while the SFP building would mainly be inerted by the presence of a high concentration of steam, the volume located below the level of the pool in adjacent rooms would maintain a high air content. The interface of the two-gas mixture presents the highest risk of flammability. Additionally, it was observed that the gas mixture could become stagnant leading locally to high hydrogen concentration while steam condenses. Overall, the experiments provide relevant information for the potentially hazardous gas distribution formed in the SFP building and hints on accident management and on eventual retrofitting measures to be implemented in the SFP building.

• 한국산업융합학회 논문집
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• 제23권1호
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• pp.65-71
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• 2020

Recently, interest in the DC transmission is rapidly increasing worldwide. In many countries and leading companies are prior to the aggressive development of HVDC technology and application. Especially, VSC-HVDC system has been widely applied to transfer power at long distance between power plant and power consumption area. Therefore in this paper, we analyzed the benefit-cost of VSC-HVDC system which has more advantages than existing transmission system. The proposed system is MMC(Modular Multilevel Converter) VSC-HVDC system that have stability of Power Grid, interconnect Large-scale New Power Generation Plants by prevents Blackout. And MMC VSC-HVDC system Reduced the loss importing foreign systems. And the benefits were calculated in four stages, and the costs were applied to the actual project. By evaluating the various avoidance costs compared to the benefit-cost, it was confirmed that MMC VSC-HVDC system was advantageous in system stability and economic and social benefits.

• Journal of Electrical Engineering and Technology
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• 제2권1호
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• pp.10-18
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• 2007

The importance of conducting necessary studies on grid reliability evaluation has become increasingly important in recent years due to the number of blackout events occurring throughout the world. Additionally, quantitative evaluation of transmission system reliability is very important in a competitive electricity environment. The reason behind this is that successful operation of an electric power company under a deregulated electricity market depends on transmission system reliability management. The results of many case studies for the Korea Electric Power Cooperation (KEPCO) system using the Transmission Reliability Evaluation for Large-Scale Systems (TRELSS) Version 6.2 are illustrated in this paper. The TRELSS was developed by EPRI and Southern Company Services Inc. This paper presents the reliability analysis of KEPCO system expansion planning by using the TRELSS program.

• 전기학회논문지P
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• 제63권4호
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• pp.254-259
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• 2014

In this paper, we describe construction of a wind stabilization demo-site and effects of output power control of wind turbines for suppression of ramp rate using ESS (Energy Storage System). It is difficult to control the output power of distributed generator such as wind turbine which of variation is very large. If the large capacity wind farm be interconnected into power system may cause blackout due to Power Quality. For these reasons, the international standards such as Grid-Code is limited to less than 10 [%/min] of renewable energy ramp rate. The case of Korea, government actively conducts propagating large-scale renewable energy for green growth policy, to interconnecting more renewable energy into power system is necessary for stabilization technology. For these reasons, the POSCO consortium has constructed a wind stabilization demo-site that is configured as 500 [kWh] battery energy storage systems can output up to 3 [C-Rate] and two wind turbines rated 750 [kW]. In POSCO consortium, which implements various methods stabilizing output power of wind turbine such as smoothing, section firming and ramp control, we derive the results of long-term demonstration that can be controlled to satisfy to the international standard about ramp rate [%/kW] of wind turbine output power.

• 한국시뮬레이션학회논문지
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• 제25권1호
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• pp.53-61
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• 2016

본 논문은 미시적 대피시뮬레이션 소프트웨어인 'EgresSIM'을 소개한다. 본 논문에서 개발한 EgresSIM은 미시적 보행모델인 Floor Field Model과 이를 발전시킨 개선된 모델을 기반으로 하는 3차원 보행자 대피시뮬레이터이다. 이 소프트웨어는 많은 층과 계단, 방, 출입구 등이 있는 대형건축물에 대한 시뮬레이션이 가능하다. 또한, 수백, 수천 명의 보행자를 실내 공간에 배치하고 이들의 움직임을 3차원 뷰어를 통해 실시간으로 확인할 수 있고, 개별 보행자들이 어떤 경로로 이동하는지, 대피시간은 얼마나 소요되는지, 각각의 출구에 얼마나 많은 대피자들이 몰렸는지 등 대피 상황에 대한 상세한 결과를 산출한다. 시뮬레이션에 필요한 건물 데이터는 사전에 정의된 실내 데이터 모델에 따라 XML 파일로 구축되며, 시뮬레이션 결과 정보도 XML 로그파일로 생성된다. EgresSIM에서 지원하는 두 가지 보행모델의 민감도 파라미터를 조정함으로써 보행자들의 이동 패턴을 여러 가지로 나타낼 수 있다. 이를 통해 최단 거리 출구로 이동하는 상황, 정전이 일어난 암흑 상황 등 여러 상황을 가정한 대피시뮬레이션 수행이 가능하다.