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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.
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/>
구속형 가스 분무 조업 시 동적 흡입 압력 특성에 관한 연구
홍승표,이진형,오방원 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.9
Melt flow rate is considered to be an important process variable in gas atomization because it greatly affects the droplet sizes, microstructures and mechanical properties of the final products. It is, however, difficult to predict the melt flow rate accuratly because it is also influenced by the aspiration pressure under the melt orifice in confined type gas atomization. It seems to be impossible to measure the orifice pressure directly during gas atomization. Hence upto now the orifice pressure has been measured statically with the pressure gage connected to the upper side of melt orifice without flow. But it is different from the real atomizing conditions, in which melt flows through the orifice. In this study, the dynamic orifice pressure was calculated by measuring the flow-out time of the melt. The dynamic aspiration effect varies with the protrusion height of melt nozzle, increases with the increasing gas jet velocity and decreases as melt flow rate increases.