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An Electrolytic Capacitorless Bidirectional EV Charger for V2G and V2H Applications
Kwon, Minho,Choi, Sewan Institute of Electrical and Electronics Engineers 2017 IEEE transactions on power electronics Vol. No.
<P>In this paper, a bidirectional battery charger is proposed for grid-to-vehicle, vehicle-to-grid, and vehicle-to-home operations of electric vehicles. The proposed charger adopts sinusoidal charging to eliminate the use of electrolytic capacitors. A nonregulating series resonant converter is employed for isolation, thereby minimizing the ratings of the components and achieving zero-current switching turn ON and OFF of switches. Meanwhile, an ac-dc converter is employed to control each mode and their mode changes, making the whole control scheme simple and the mode changes seamless. A 3.3-kW prototype was built in the laboratory to validate the proposed concept. Our experimental results demonstrate that the proposed charger has high efficiency and can seamlessly switch between the three operation modes.</P>
Seismic performance of RC-frame structures with GFRP infill panels
Kwon, Minho,Seo, Hyunsu,Kim, Jinsup Elsevier 2017 COMPOSITE STRUCTURES -BARKING THEN OXFORD- Vol.160 No.-
<P><B>Abstract</B></P> <P>This paper presents results from experimental studies on the seismic performance of RC-frame structures strengthened with glass-fiber-reinforced polymer (GFRP) infill panels. Three RC specimens were fabricated and then tested to evaluate the efficiency of the GFRP infill panels. The performance of GFRP infill panels installed in RC-frame structures was evaluated based on the results from measures of strength, failure mode, initial lateral displacement, displacement ductility and hysteretic dissipated energy. Both the strength and the initial lateral stiffness of the RC-frame structures strengthened with GFRP infill panels was greater than that of the un-strengthened specimen; however, the displacement ductility and energy-dissipation capacity of specimens strengthened only with GFRP infill panels decreased. This decreased-ductility issue was resolved by adding GFRP column reinforcement at the tops and bottoms of the columns. The strength, initial lateral stiffness, displacement ductility and energy dissipation capacity of the specimens strengthened with both GFRP infill panels and GFRP column reinforcement increased over the un-strengthened specimen. Finally, it is important that GFRP infill panels, if used together with GFRP column reinforcements, be considered in seismic-strengthening design in order to increase the seismic performance of existing RC-frame structures.</P>