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계통 연계형 태양광 인버터의 신뢰성 향상을 위한 RAM 분석
박홍빈(H.B. Park),한영진(Y. J. Han),김재중(J.J. Kim),권영길(Y.G. Kwon),최석민(S.M. Choi) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Power conditioning systems (PCS) perform to convert the variable direct current (DC) output of a solar module into alternating current (AC) that is distributed to the electrical grid. For providing high quality power continuously, it is importance to develop high reliable and maintainable PCS in system design and development phase. In this paper, we deal with a RAM analysis of a PCS and build a functional tree in order to define essential functions and components in the system. Also, a commercial simulation S/W, BlockSim is used to estimate the average annual availability and average annual frequency of system failures. Also, numerical examples are studied in order to analyze the target values of MTBF of the components and PM intervals that satisfy the target availability and reliability.
3차원 자장 해석을 통한 1㎿ 급 고온초전도 모터의 특성 해석
백승규(S. K. Baik),손명환(M. H. Sohn),이재득(J. D. Lee),이언용(E. Y. Lee),권영길(Y. K. Kwon),문태선(T. S. Moon),박희주(H. J. Park),김영춘(Y. C. Kim),박관수(G. S. Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Different from the conventional motor, the superconducting motor has so large air-gap that the actual parameters such as excitation voltage have considerable difference from the values obtained from 2-dimensional electromagnetic analysis. This paper introduces 3-dimensional EMCN(Equivalent Magnetic Circuit Network) method or FLUX - 3D FEM(Finite Element Method) software to reduce the error originated from the 2-dimensional electromagnetic analysis for the development of a 1 ㎿ class high-temperature superconducting motor.
1㎿ 급 초전도 모터용 고온초전도 계자코일의 전자기적 특성
백승규(S. K. Baik),손명환(M. H. Sohn),이재득(J. D. Lee),이언용(E. Y. Lee),권영길(Y. K. Kwon),문태선(T. S. Moon),박희주(H. J. Park),김영춘(Y. C. Kim),박관수(G. S. Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
On the contrary of a conventional motor with very narrow air-gap, it is difficult to calculate the accurate magnetic field distribution and the performance of an air-cored superconducting motor by 2 dimensional analysis, which does not use high permeability material except outer machine shield. This paper aims to do analysis of magnetic field and force distribution from the 3 dimensional modelling of a 1㎿ class superconducting synchronous motor. Especially, the field coil composed of Bi-2223 high-temperature superconductor and the outer machine shield are modelled by finite element analysis software according to their structures and the self-inductance and Lorentz force are calculated based on the 3 dimensional magnetic field calculation.