Papers by Author: Wei Feng

Abstract: In remote areas, the scheme of networking grid complementarily by the large capacity ofPV plants and the hydropower units becomes an important choice. After analyzing the design of ahydroelectric-connected PV plants, this paper presents a detailed requirement of a large capacitybattery charger. The Buck circuit topology is adopted as the topology of the battery charger satisfyingthe demand the high charging efficiency and reliability and a 3 phase phase-shifted interleavingtopology is adopted to resolve the problem of high power application. Finally a double-loop controlstrategy was designed for implementing the batteries three-stage charging control and PV MPPTfunction. A 150kW battery charger is developed and used in PV plant of the Yushu, Qinghai province,China. The experimental data acquired form

Abstract: This paper presents the development a drop-on-demand micro-dispensing system on which functional devices can be directly printed in a layer-by-layer manner that is commonly used in Rapid Prototyping and Manufacturing processes. The principle is to form micro droplets on substrate that requires accuracy and consistency with the ability to build 3D model. It requires heating of material to a desired temperature and viscosity which allows the piezoelectric the ability to pump out. In order to build a 3D model, a basic XYZ-axis gantry, motion controller and dispenser with temperature controller were developed and integrated. Experiments with different materials were carried out to understand the influences of the dispensing parameters on continuous frequency output. The results hold attractive potential for the use of this system in fabricating 3D models which meet the accuracy and resolution needs for various industry applications.