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부스트 컨버터를 이용한 3Kw 태양전지 어레이 가상구현 설계
오방원(B.W. Oh),이상용(S.Y. Lee),이병인(B.I. Lee),정병환(B.H. Jung),최규하(G.H. Choe) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
Recently, energy problem has become more Important thing than that of past years. Therefore, researchers in many countries are trying to find the solution for removing energy problem. One of all is the power generation with using the photovoltaic system. Because this system has some advantage, like purity and infinity. However, there are some problems to generate electrical power with using photovoltaic system. That problems, taking up a very big space and taking financial worries, come into existence. So it is inevitable to make the virtual implement equipment for doing repetition experiment and solving this problems. In this paper, Boost converter are analyzed and simulated to make high power PV virtual implement system as input source instead of using transformer.<br/>
PDFF 제어기법을 이용한 단상 UPS 인버터 전압,전류제어에 관한 연구
오방원(B.W. Oh),이상용(S.Y. Lee),이용균(Y.K. Lee),전윤석(Y.S. Jeon),최규하(G.H. Choe) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
There are many methods in controlling inverter's voltage and currents. most of all, PI control method is a general method. PI control has some merits. But, PI control has zero effect. So, steady-state response errors always exist by the zero effect. For removing the steady-state error, This paper presents the modeling, design and analysis of the double loop feedback control scheme. and computing the value of parameters and applying to the single-phase full bridge inverter for comparison and analysis between the PI control and PDFF control. The system model is employed to examine the dynamics of power circuit and select appropriate feedback variables for stable operation of the closed-loop UPS inverter system. It analyzes and proves the output characteristic of inverter system with the PDFF control.
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)
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.