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최영도(Young-Do Choy),전영수(Young-Soo Jeon),전동훈(Dong-Hoon Jeon),신정훈(Jeong-Hoon Shin),이재걸(Jae-Gul Lee),남수철(Su-Chul Nam) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
풍력발전과 실계통의 동적응동을 분석하기 위해 현재 고창에 설치되어 있는 전력품질 설비는 전력품질 외란(Sag, Swell, Flicker)을 발생시킬 수 있는 SSFG와 전력품질 보상설비(SSTS, DVR, DSTATCOM, APF), 고조파 발생기인 PCR, 부하(저항, 리액터)등이 설치되어 있고, 선로정수를 모델링 하기 위한 선로정수(10㎞, 20㎞, 30㎞, 40㎞)가 풍력발전 시뮬레이터와 연계되어 있다. 본 논문은 고창 전력품질 실증시험장에서 계통에 연계된 1.5MW급 풍력발전 시뮬레이터를 이용하여 선로정수에 따라 가변 풍속에서 이중여자 풍력발전기의 무효전력을 임의로 제어했을 때 풍력발전기의 특성을 파악하기 하고, 계통에 미치는 영향을 분석하였다.
이영도(Young Do Lee),설재완(Jea Wan Soel),주병윤,임성한(Sung Han Rhim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.6
In this study, we have designed and developed proto type machine that is able to form a pattern forming using isostatic pressing and have progressed a pattern forming on the plates and curved plates In this study to research a pattern forming of a newly proposed process, we determined a decision creteria by filling ratio. PMMA material progressed plate forming using polymer die. we research for bending, torsion, and forming quality of materials that while it is plate forming, and suggest to prevent bending, and torsion, and changing geometry of material aspects.
Performance analysis of Savonius Rotor for Wave Energy Conversion using CFD
최영도(Choi, Young-Do),김규한(Kim, Kyu-Han),이영호(Lee, Young-Ho),Zullah, Mohammed Aisd 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
A general purpose viscous flow solver Ansys CFX is used to study a Savonius type wave energy converter in a 3D numerical viscous wave tank. This paper presents the results of a computational fluid dynamics (CFD) analysis of the effect of blade configuration on the performance of 3 bladed Savonius rotors for wave energy extraction. A piston-type wave generator was incorporated in the computational domain to generate the desired incident waves. A complete OWC system with a 3-bladed Savonius rotor was modeled in a three dimensional numerical wave tank and the hydrodynamic conversion efficiency was estimated. The flow over the rotors is assumed to be two-dimensional (2D), viscous, turbulent and unsteady. The CFX code is used with a solver of the coupled conservation equations of mass, momentum and energy, with an implicit time scheme and with the adoption of the hexahedral mesh and the moving mesh techniques in areas of moving surfaces. Turbulence is modeled with the k.e model. Simulations were carried out simultaneously for the rotor angle and the helical twist. The results indicate that the developed models are suitable to analyze the water flows both in the chamber and in the turbine. For the turbine, the numerical results of torque were compared for all the cases.