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ZhEng, D. W.,Huang, Y. P.,Tang, T. A.,Cui, Q.,Li, A. Z.,Zhou, S. X.,He, Z. J.,Chen, Z.,Zhang, X. J.,Kwor, R. 대한전자공학회 1993 ICVC : International Conference on VLSI and CAD Vol.3 No.1
A novel process for silicon on insulator(SOI) technology has been presented. Single crystal Si is grown by molecular beam epitaxy(MBF) on a porous silicon(PS) system consisting of two layers of PS with different microstructures. Subsequent lateral oxidation converts the structure to SOI wish excellent insulation property. Si islands with a width of 135㎛ and low doping concentration have been achieved.
Research of Seamless Transfer Control Strategy of Microgrid System
M.J. Yang,F. Zhuo,X.W. Wang,H.P. Guo,Y.J. Zhou 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Microgrid has two typical working modes: grid-connected mode and islanded mode. The transfer between these two modes should be seamless. In a microgrid that uses master-slave strategy to avoid circumfluence in the islanded mode, to control the master converter’s voltage is to control the microgrid voltage. Considering this, the master converter in this paper works as a voltage-controlled inverter when the microgrid is disconnecting from the utility grid while working as a current-controlled rectifier when the microgrid is in the grid-connected mode. Besides, by gradually adjusting the master converter’s output voltage to equal that of the utility grid when the microgrid is going to connect the utility grid and by setting an appropriate initial phase of the converter voltage when the microgrid needs to work alone, the seamless transfers between these two modes are accomplished. Experiment has been done to validate the accuracy, rapidity and reliability of this strategy.