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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.
이상용(S.Y. Lee),강병희(B.H. Kang),채영민(Y.M. Chae),목형수(H.S. Mok),초규하(G.H. Choe),김덕근(D.K. Kim),류재성(J.S. Ryu) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
A brushless DC motor has the high quality of torque output and silence, has been more widely used in industrial area. As the driver and controller of BLDC motor have been more complicated and precise, simulation method has been much used m motor design. And the output characteristics of BLDC motor is determined by the waveform of BACK-EMF in instinct. But because the conventional model of BLDC motor is obtained by approximation of real nonlinear waveform to ideal trapezoidal waveform, the error is occurred in slmulation result. Thus in this paper, for the correction of this error in simulation, the model of real nonlinear waveform considered is proposed, and the simulation result is obtained in case of three-phase, four-poles Y-connected, surface mounted permanent magnet BLDC motor.
Droop Method를 용한 50[W]급 태양전지 가상구현 시스템의 병렬연결 출력특성에 대한 연구
이병인(B.I. Lee),이상용(S.Y. Lee),오방원(B.W. Oh),정병환(B.H. Jung),최규하(G.H.Choe) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
General1y, photovoltaic system is composed with several solar cell modules. For increasing power of photovoltaic systems, serial and parallel connection needed. A Desirable characteristic of a parallel supply system is that individual converters share the load current equally and stably. The current sharing(CS) can be Implemented using two approaches. The first one, known as a droop method, relies on the high output impedance of each converter. and The second approach, known as active current-sharing techniques. In this paper, using droop method at parallel connection with it's convenience and simplicity.<br/>
이상용(S.Y. Lee),정병환(B.H. Jeong),오방원(B.W. Oh),이병인(B.I. Lee),최규하(G.H. Choe) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
Many solar cell array need to be connected by series or parallel to extract the high power, Especially, during parallel operation to reduce circulation current the individual converter has to share and control the load current. Generally, current Sharing(CS) can be implemented using droop and active current sharing method In this paper, one 3[KW] PWM converter was replaced as one 3[KW] solar cell array(3 parallels, each parallel has twenty single modules), two 3[KW] solar cell array is paralleled to generate 6[KW] power, Also each converter used voltage-current controller and Automatic MSCPM(Master-Slave Current-programming Method) for current sharing(AS)