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해저케이블 비용 모델을 이용한 HVAC 해상변전소 적정 위치 선정에 관한 연구
원종남(Jong-Nam Won),문원식(Won-Sik Moon),허재선(Jae-Sun Huh),김재철(Jae-Chul Kim) 대한전기학회 2013 전기학회논문지 Vol.62 No.4
Development of the technologies for offshore wind power is proceeding actively and the installation capacity is continuously increasing because of its many advantages in comparison with the land wind power. Accordingly, project for Southwestern 2.5GW offshore wind power plant is in progress in Korea. Design of electric power systems for offshore wind power plant is very important due to its high investment and operational costs. Hence, it needs to be designed in order to minimize costs. This way can be employed in determining the installation location of offshore substation for HVAC wind power plant. According to the offshore substation site, MV inter-array cable and HV export cable lengths vary and they change a total cost regarding submarine cable. This paper represents cost models with variables which are MV inter-array cable and HV export cable lengths to locate the offshore substation for HVAC wind power plant. It is classified into submarine cable installation cost, reactive power compensator installation cost, ohmic losses, and unsupplied energy cost. By minimizing a total cost, an appropriate installation site of the offshore substation is determined.
최계광,남원종,이용신,Choi, Kea-Kwang,Nam, Won-Jong,Lee, Yong-Shin 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.3
The performance and life of a die are influenced by the machining methods. In order to examine the effects of machining methods on surface charactenstics, simple experiments are devised and performed. A die steel STD11, commonly used as a die material in press working, is selected. Three ways of machining methods to manufacture a die are considered. Those are (1) milling and then grinding, (2) wire-cut electric discharge dachining (W-EDM) and (3) heat treatment after W-EDM. The resulting surface roughnesses are measured. Also, the changes of surface microstructures are investigated using the scanning electron microscope(SEM) with energy dispersive X-ray spectrometer(EDS) and the results are discussed in details.