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Niching 유전 알고리즘을 이용한 전기자동차용 유도전동기의 최적 설계
이철균(Cheol-Gyun Lee),조동혁(Dong-Hyeok Cho),정현교(Hyun-Kyo Jung) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.3
In the case of an induction motor efficiency optimal design for electric vehicle which is a real world problem, several different designs are almost equal in terms of efficiency. But these designs may have the differences in terms of other characteristics such as power factor, temperature rise, material cost, and ease of manufacture. Therefore it is necessary that an optimization routine suggests various possible solution alternatives and a designer selects optimal solution among them using other characteristics, his experience and judgment. In this paper new niching genetic algorithm and the rating function method to select the optimal point among possible optimal solution alternatives are presented.
Optimal Design of Brushless DC Motor Using Parallel Genetic Algorithm
이철균(Cheol-Gyun Lee) 동의대학교 정보통신연구소 2005 정보통신연구지 Vol.6-2 No.-
The optimization problems that have many design variables, such as the design of brushless DC motor (BLDCM), the conventional genetic algorithms fall into a trap of local minima with high probability. Parallel genetic algorithms are one of the most famous spatial separation algorithms to avoid it. Parallel genetic algorithms maintain multiple and separate subpopulations which are linked by the genetic operation of migration. The migration mechanism consists of several parameters such as the migration size, the migration interval, and the migration topology. In this paper, we propose a new method about the migration interval. To verify its validity, this method is applied to some traditional mathematical problems.
전기추진선박의 운전조건별 전력특성 및 추진전동기 특성 비교 해석
이상곤,정유석,정상용,이철균,Lee, Sang-Gon,Jeong, Yu-Seok,Jung, Sang-Yong,Lee, Cheol-Gyun 한국전기전자학회 2011 전기전자학회논문지 Vol.15 No.1
본 논문에서는 발전기, 스위치보드, VFD, 추진전동기 등으로 구성된 전기추전선박의 전력 네트워크를 모델링하고, 전력조류해석과 단락전류해석을 통하여 계절별 선박 운용에 따른 전력시스템 특성 해석 및 단락사고 발생 시차단기의 용량을 선정한다. 이와 더불어 3.7MW급 유도전동기 및 영구자석형 동기전동기의 정성적, 정량적 비교 해석을 통해 전기선박 추진전동기로 적합성에 대해 추가 고찰한다. This paper deals with the characteristic analysis of the integrated power system applied for the electric propulsion ships. This includes the electric power system modeling which is accomplished with the electric power network mainly composed of generators, switchboards, variable frequency devices, electric motors, and etc. In addition, performance comparison between the permanent magnet synchronous motor (PMSM) and the induction motor (IM) for 3.7MW ship propulsion has been done. In order to investigated the main performance of propulsion motor, a coupled model taking into account torque density, copper loss, iron loss, efficiency, power factor, and torque ripple using finite element analysis (FEA) has been employed.
신지영,손영석,차득근,이철균,황이철,Shin, Jee-Young,Son, Young-Seok,Cha, Duk-Guen,Lee, Cheol-Gyun,Hwang, I-Cheol 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.8
The objective of this study is to investigate the aerodynamic characteristics of a vertical axis wind turbine blade as the basic study of a design of a vertical axis wind turbine. The lift and drag coefficients of the various shape of the vortical axis wind turbine blades are analyzed and compared using the CFD code Fluent. To validate the numerical analysis, the predicted results of the Fluent are compared with those of the Xfoil code and the experimental results. We conclude that the program Fluent can be used to predict the aerodynamics of the wind turbine blade. By comparing the predicted results of the aerodynamic characteristics of the different shape of the blades, an appropriate shape of the blade is suggested to design the vortical axis wind turbine blade.
연간 최대 에너지 생산량을 위한 직접구동 영구자석 풍력 발전기의 최적설계
조명수(Myung-Soo Cho),이철균(Cheol-Gyun Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
In this paper, annual energy production (AEP) of the wind generator system is analogized considering the regions of a variable wind speed and it is applied to optimal design of the PM wind generator for capturing maximum energy in the operating regions. In addition, internet parallel computing is used to loose excessive calculation times through optimization of the finite element analysis(FEA).
정호창(Ho-Chang Jung),이철균(Cheol-Gyun Lee),김은수(Eun-Su Kim),김종욱(Jong-Wook Kim),정상용(Sang-Yong Jung) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.10
본 논문에서는 유한요소볍(Finite Element Method)을 기반으로 하는 직접 구동형 영구자석 풍력발전기를 DEAS(Dynamic Encoding Algorithm for Searches)를 이용하여 연간 최대에너지 생산량(Annual Energy Production : AEP) 최대화를 목표로 최적설계 하였다. 특히, 풍력발전기의 전 운전영역을 고려하기 위하여 해당풍속에서의 통계적 확률밀도와 연간 운전시간을 적용하여 연간 최대에너지 생산량을 산정하였으며, 여기서 발생한 과도한 해석수행 연산시간을 줄이기 위해서 전역 최적화 알고리즘인 DEAS를 적용하여 풍력발전기 최적설계를 수행 하였다. Optimal design of the direct-driven PM Wind Generator, combined with DEAS(Dynamic Encoding Algorithm for Searches) and FEM(Finite Element' Method), has been proposed to maximize the Annual Energy Production(AEP) over the whole wind speed characterized by the statistical model of wind speed distribution. In particular, DEAS contributes to reducing the excessive computing time for the optimization process.