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최형범(Hyoung-Bum Choi),김경철(Kyung-Chul Kim),황영록(Young-Rok Hwang),이일무(Il-Mu Lee) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
Development and use of renewable energy due to environmental problems and depletion of energy affect grid-connected power system around the world. Therefore This paper analyzes the characteristic of gird connected photovoltaic power generation system which it is available to connect the utility. Renewable energy photovoltaic power system has been linked to the system to analyze the impact of photovoltaic system. MATLAB / Simulink program is modeled and analyzed on power quality of a photovoltaic power plant.
최형범(Hyoung-Bum Choi),김경철(Kyung-Chul Kim),황영록(Young-Rok Hwang),이일무(Il-Mu Lee),정지원(Ji-won Jung) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
Power systems becomes more highvoltage and high capacity recently. Power system caused by the accident of insulation breakdown. Excellent power cable is used due to advances in technology, but old cable and damage cable causes a power failure. This paper analyzed partial discharge using pattern analysis method of power cable. The simulation of partial discharge of power cable with defects was analyzed using pattern recognition methods.
최형범(Hyoung-Bum Choi),김경철(Kyung-Chul Kim),황영록(Young-Rok Hwang) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.8
Development and use of renewable energy due to environmental problems and depletion of energy affect grid-connected power system around the world. Therefore this paper analyzes the characteristic of gird connected photovoltaic power generation system which it is available to connect the utility. Renewable energy photovoltaic power system has been linked to the system to analyze the impact of photovoltaic system. MATLAB / Simulink program is modeled and analyzed on power quality of a photovoltaic power plant. It is measured that power data for the Grid connected photovoltaic power plant with instantaneous measuring, 3sec measuring, 10min measuring for 7 days. Harmonic field measurement have shown that the harmonic contents of a waveform varies with time. A cumulative probability approach is the most commonly used method to solve time varying harmonics. so, it is used 50[%] cumulative probability approach. This paper provides an in depth analysis on power quality field measurement of the Grid connected photovoltaic power plant.
회전 · 승하강식 가로등주 활용을 통한 녹색성장 효과에 관한 연구
최형범(Hyoung-Bum Choi),김경철(Kyung-Chul Kim),오성환(Sung-Hwan Oh),박동현(Dong-Hun Park),황영록(Young-Rok Hwang),이규진(kyu-jin Lee),정지원(Ji-won Jung) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.9월
The current streetlight system have been tried various attempts. but during maintenance, it has caused the traffic congestion and many risk factors. In addition, maintenance costs are very expensive to manage and the local government have to establish countermeasures about the present condition. If neglected, it may cause a variety of social problems. so, there should be a measure to prevent problems. This rotational and up-and-down type streetlight can be a solution to these factors and it has been highlighted indirectly in terms of green growth because we have to take advantage of the value.
회전·승하강식 가로등주 활용을 통한 녹색성장 효과에 관한 연구
최형범(Hyoung-Bum Choi),김경철(Kyung-Chul Kim),오성환(Sung-Hwan Oh),황영록(Young-Rok Hwang),정지원(Ji-Won Jung),박동현(Dong-Hun Park) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.2
The current streetlight system have been tried various attempts. but during maintenance, it has caused the traffic congestion and many risk factors. In addition, maintenance costs are very expensive to manage and the local government have to establish countermeasures about the present condition. If neglected, it may cause a variety of social problems. so, there should be a measure to prevent problems. This rotational and up-and-down type streetlight can be a solution to these factors and it has been highlighted indirectly in terms of green growth because we have to take advantage of the value.
최형범(Hyoung-Bum Choi),김경철(Kyung-Chul Kim),이일무(Il-Mu Lee),황영록(Young-Rok Hwang),오길록(Gil-Rok Oh) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
Harmonics of the power quality in systems is growing more and more as a modern industrial society process. Among these harmonics, the problem of dangerous situations is generated especially in the whole system when exists high levels of harmonic. In this paper, we analyzed about type of cause for harmonic on the quality measurements and performed simulation for resolving the problem on ther basic types of filters installation before and after.
최형범(Hyoung-Bum Choi),김경철(Kyung-Chul Kim),이일무(Il-Mu Lee),황영록(Young-Rok Hwang) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.9월
The photovoltaic power generation is one of the most suitable energy sources in the worldwide as a new and renewable energies for the fossil fuels shortage and global warming. The PV system needs a large area, appropriate module arrangement and sufficient solar radiation to get maximum power generation. In this paper, the optimum installation area size for an inclined fixation photovoltaic system was presented by calculating and simulating the optimum angle of solar radiation and arrangement of PV modules in the economic aspects pursuing the user's maximum profits.
LCD공장 내부의 온도센서 노이즈진단 및 억제에 관한 연구
김경철(Kyung-Chul Kim),최형범(Hyoung-Bum Choi),황영록(Young-Rok Hwang),김용관(Yong-Kwan Kim),유창훈(Chang-Hun You) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.8
As automation equipment and electronic device progresses, the importance of power quality is more increasing. This paper represents the analysis and suppression about the causes of trouble by the inverter’s ON/OFF noise in plant in order to prevent damage resulting in a secondary damage to conduct precise diagnosis and effective noise reduction. The countermeasure as a reduced carrier frequency and the LC resonant filter had been applied and confirmed the effective results to solve the trouble of noise.
전기로 부하에서 SVC의 고조파 및 플리커 효과에 관한 연구
김경철(Kyung-Chul Kim),최형범(Hyoung-Bumb Choi),오정석(Jung-Suk Oh) 한국조명·전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.10
규모가 큰 제철소는 전기로를 포함한 시간에 따라 변하는 비선형 부하를 가지고 있다. 이들 비선형 부하는 고조파 전류를 발생시키고, 전력계통의 전압을 왜곡시킨다. 플리커는 전압 변동의 크기에 따라 램프의 방출 변화에 의한 인간의 지각 효과로 정의된다. SVC의 주 목적은 공통결합점에서 전압을 한계값 이하로 유지하는데 있다. 본 논문에서는 SVC 투입 전후의 고조파와 플리커 저감 효과를 분석하고, IEC 61000-3-6과 IEC61000-3-7에 의해 평가하였다. Large steel industries have time-varying nonlinear loads including electric arc furnaces. These nonlinear loads generate harmonic currents and create distortions on the sinusoidal voltage of the power system. Flicker can be defined as the effect produced on the human visual perception by a changing emission of light lamps subjected to magnitude fluctuations of their supply voltage. The main objective of the static var compensator(SVC) is to maintain the rms voltage at the point of common coupling within the limit. In this paper, harmonic and flicker mitigation studies with and without the SVC are investigated, and are evaluated by the IEC 61000-3-6 and IEC 61000-3-7.
서광규(Seo Kwang-Kyu),최형범(Choi, Hyung-Beom),박찬영(Park, Chan-Young) 한국산학기술학회 2007 한국산학기술학회 학술대회 Vol.- No.-
본 논문에서는 DEA 기법을 이용하여 고객들이 이동통신사를 선정하기 위한 모델을 제안하였다. 소비자들은 이동통신사를 선정함에 있어 여러 가지 기준들에 의한 합리적인 의사결정을 내리기가 용이하지 않다. 본 논문에서는 다기준 의사결정방법들 중 정성적인 평가요소들을 기준으로 대안의 효율성을 고려한 DEA 기법을 활용하여 소비자들의 이동통신사 선정에 도움을 주고자 하였다.