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문상근(Moon Sang Keun),여상욱(Yeo Sang Uk),전해군(Jeon Hae Kun),이훈(Lee Hoon) 대한전기학회 2015 대한전기학회 학술대회 논문집 Vol.2015 No.5
신재생에너지와 같은 분산전원의 연게와 전력계통 네트워크 구성방식의 고도화에 따른 기존의 네트워크 해석방식과의 차별성을 가지는 토폴로지 탐색방법을 제안한다. 배전계통 ICT 인프라는 이러한 응용과 해석을 가능하게 하며, 실시간으로 변화하는 계통의 구성과 상태를 반영한 전략수립 방법을 고찰한다. 본 논문에서는 해석적 접근에서 방법적 접근방법을 이용한 전압안정도의 지수를 판단하고, 해당 지수에 기반한 취약점 탐색과 토폴로지 구성변경 전략을 제안한다.
정상근(Jung Sang-Keun),최준형(Choi Joon-Hyung),양일승(Yang Il-Seung),문연준(Moon Youn-Joon),김순철(Kim Soon-Chul) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
The object of this study is investigated to flexural behaviors of deck-plate slabs using wire mesh. The wire mesh instead of deformed bars are used to improve convenience of construction. Test variables are concrete topping thicknesa(75㎜, 100㎜), types of main bars(1-D6, 2-D6, 3-D6) in compression and tension regions, and width in bottom face of deck plate(58㎜, 68㎜). The vertical loading by monotonic are applied to investigate the yielding strength, maximum strength, initial stiffness and failure modes. Test results are follows ; (1) Higher stiffness and strength was shown that more the wire mesh was, the thicker the slab was. (2) In specimens using wire mesh instead of reinforced bars, experiment results is 1.13~1.83 times that those of calculated results.
전기자동차의 충전부하 모델링 및 충전 시나리오에 따른 전력계통 평가
문상근(Sang-Keun Moon),곽형근(郭炯根),김진오(Jin-O Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.6
Electric Vehicles(EVs) and Plug-in Hybrid Electric Vehicles(PHEVs) which have the grid connection capability, represent an important power system issue of charging demands. Analyzing impacts EVs charging demands of the power system such as increased peak demands, developed by means of modeling a stochastic distribution of charging and a demand dispatch calculation. Optimization processes proposed to determine optimal demand distribution portions so that charging costs and demand can possibly be managed. In order to solve the problems due to increasing charging demand at the peak time, alternative electricity rate such as Time-of-Use(TOU) rate has been in effect since last year. The TOU rate would in practice change the tendencies of charging time at the peak time. Nevertheless, since it focus only minimizing costs of charging from owners of the EVs, loads would be concentrated at times which have a lowest charging rate and would form a new peak load. The purpose of this paper is that to suggest a scenario of load leveling for a power system operator side. In case study results, the vehicles as regular load with time constraints, battery charging patterns and changed daily demand in the charging areas are investigated and optimization results are analyzed regarding cost and operation aspects by determining optimal demand distribution portions.
문상근(Sang-Keun Moon),김성열(Sung-Yul Kim),우상민(Sang-Min Woo),김진오(Jin-O Kim) 대한전기학회 2011 대한전기학회 학술대회 논문집 Vol.2011 No.10
Electric Vehicles(EVs) and Plug-in Hybrid Electric Vehicles(PHEVs) which have the grid connection capability, represent an important power system issue of charging demands. Analyzing impacts EVs charging demands of the power system such as increased peak demands, developed by means of modeling a stochastic distribution of charging and a demand dispatch calculation. Optimization processes proposed to determine optimal demand distribution portions so that charging costs and demand can possibly be managed. The purpose of this paper is that to suggest a scenario of load leveling for a power system operator side and analyze impacts of the system. In case study results, the vehicles as regular load with time constraints, battery charging patterns and changed daily demand in the charging areas are investigated and optimization results are analyzed regarding cost and operation aspects by determining optimal demand distribution portions.