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박태식(Park Tae-Sik),허용호(Hur Yong-Ho),이광운(Lee Kwang-Woon),문채주(Moon Chae-Joo),곽노홍(Kwak No-Hong) 한국태양에너지학회 2016 한국태양에너지학회 논문집 Vol.36 No.4
The demands for photovoltaic systems on a large scale have grown dramatically and require new technologies to get the high efficiency and reliable operations of power conversion systems. These needs can be realized by the cost-effective and high performance digital revolutions and faster semiconductor switching devices. However, the new power systems have been more sophisticated and their reliability becomes critical issues. In this paper, a new fault-tolerance power conversion scheme for the photovoltaic systems is proposed. The proposed fault-tolerant scheme is able to supply energy from solar panels to loads intermittently in spite of a front boost converter open failure, and its voltage and current controllers are designed to improve the transient performance by using an average model design scheme. The proposed approach is verified both by simulations. The results will enable more timely and wide usage of alternative/renewable energy systems resulting in increased energy security.
高冠瑞,許龍虎 釜山水産大學校 1976 釜山水産大學 硏究報告 Vol.16 No.1
The strength of netting twine is the most important problem in choice of netting material for fishing gear construction. However, the strength of netting twine is influenced ascribe to the plied yarns, the number of twist, the balance of under and upper twist, the testing time, temperature, humidity and the construction of loading clamps, etc. It is common fact that the test result is disregarded and an additional test is performed if the test specimen slips in the clamps of the testing machine, or breaks in or at the edges of the clamps, or if the result appears to be different from other results in the test as a consequence of unusual or irregular faults in the material. In order to compare the reciprocal differences concerning strength, sheave-shaped special clamps are used instead of plane-shaped clamps which are supplied with the testing machine. And also load-elongation curves of the netting twine and the tuna long line are analyzed. The netting twine of PE indicates 24mm-32mm extension at break after maximum point which is 50kg-70kg higher than the breaking strength, while the other materials coincide the maximum point with the breaking point. Furthermore, some attempts have also been made to study preference shown to breaking strength by the 3 kinds branch line of the tuna long line made of PES and PVC dissimilar components rope. The strengths show 247.3kg, 26.0kg, 307.8kg, respectively, in spite of discontinuous fibers are included in the surrounding PES with PA dissimilar components rope, indicating highest strength.