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공간전압벡터 PWM을 이용한 7상 영구자석형 동기전동기의 구동 시스템
김한구(H.G. Kim),최문규(M.G. Choi),정병환(B.H. Jeong),목형수(H.S. Mok),최규하(G.H. Choe) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
The motor research of pre-existing attaches importance about one and three motor of reduce torque ripple and speed control. 3-Phase PMSM Motor, which is generally used, has limited usage in high speed, due to pulsation torque and variable speed. To solve this problem, it is necessary to increase invariable, pole number or the number of slots. In this paper 7-Phase PMSM Motor of Steady state analysis of Torque and Output Voltage characteristic. 7-Phase modulation method with Space Voltage Vector is studied for ideal operation of controller.
AFD방식을 이용한 단상 계통연계형 PV시스템의 단독운전시 계통주파수 변동 특성 해석
허혜성(H.S. Heo),김홍성(H.S. Kim),김한구(H.G. Kim),최규하(G.H. Choe),최영호(Y.H. Choi),김재철(J.C. Kim) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
To detect islanding mode when the grid is being tripped is a major safety issue in utility interactive PV(UIPV) system. And one of the widely used techniques to detect islanding mode are Reactive power variation (RPV)method and Active frequency drift (AFD)method. In this paper, analytical design method is suggested for AFD method under IEEE recommended islanding test condition. And in order to show the validity of proposed method, EMPT based simulation was done for UIPV system with AFD method. Results shows proposed method is very useful.
태양전지 어레이를 위한 최대 전력점 추종기에 관한 연구
이상용(S.Y. Lee),김한구(H.G. Kim),오방원(B.W. Oh),김홍성(H.S. Kim),최규하(G.H. Choe) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
The output of solar array is changed non-linearly by variation of insolation and temperature. Hence, as varying insolation and temperature, Maximum Power Point Tracking(MPPT) is necessary to increase generation efficiency of solar array. This paper presented MPPT algorithm using position control of output voltage and current of solar array and implemented hardware MPP tracker which is appropriate and inexpensive for low power system(ten s~hundreds watt). Finally, those were verified through simulation.
박종찬(J. C. Park),김한구(H. G. Kim),정병환(B. H. Jeong),강병희(B. H. Kang),최규하(G. H. Choe) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
Recently, power supply-demand instability due to the dramatic increase in power usage suchas air-conditioning load at summertime has brought forecasts of decrease in power supply capability. Therefore improving the load factor through systematic load management, in other words, Direct Load Control became necessary. Direct Load Control(DLC) system is kind of a load management program for stabilization of electric power supply-demand. It's purpose is limiting the demand of the demand side selected at peak load or other time periods. The paper presented a Design of Direct Load Controller for control the amount of power demand in demand side. The proposed Controller is cheaper and has ability of storing more power data than pre-existing device.