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quarta-feira, 24 de abril de 2013
terça-feira, 23 de abril de 2013
domingo, 14 de abril de 2013
Design and Implementation of Paralleled Multi-Inverter Systems with Redundancy and Hot-swap Features
Design and Implementation of Paralleled Multi-Inverter Systems
with Redundancy and Hot-swap Features
Student: Jia-Wei He Advisor: Tsai-Fu Wu, Ph.D.
Yaow-Ming Chen, Ph.D.
Institute of Electrical Engineering
College of Engineering
National Chung Cheng University
英文摘要
Abstract
This thesis proposes redundancy and hot-swap features for paralleled
multi-inverter systems with voltage control and current weighted distribution
control (CWDC) strategy. With a CWDC strategy, instantaneous current is fed
back and monitored; thus, weighted output current distribution and fast regulation
among the inverters can be achieved for linear and nonlinear loads. Additionally,
the proposed paralleled system is equipped with the features of redundancy and
hot-swap; therefore, system power rating can be expanded readily and it has high
maintainability. Simulation results and hardware measurements from a
two-inverter system with either equal or different power ratings have demonstrated
the feasibility of the proposed control scheme in fast regulation and weighted
current distribution. The proposed redundancy and hot-swap features have
improved reliability and stability of the paralleled multi-inverter system.
Implementation of Three-Phase Fed DC Power Supply System with High Power Factor
with High Power Factor
In this thesis, a high efficiency power supply system with high
power factor is proposed for high power applications. The studied power
supply system consists with a three-phase three-switch power factor
corrector (PFC) and a phase-shifted zero-voltage-transition full-bridge
DC/DC converter with current doubler rectification. High power factor
input can be achieved by the adopted PFC circuit with a simple
configuration. The phase-shifted operation of the full-bridge DC/DC
converter provides the zero-voltage-switching (ZVS) features for the
bridge switches to reduce the switching losses effectively. The current doubler rectification reduces significantly the secondary rectification losses. Therefore, high efficiency can be also accomplished. The detailed operating principle and design consideration of this power supply system are analyzed and described. A 1.1kW 55V/20A laboratory prototype was implemented and tested. The experimental waveforms verify the feasibility of the proposed design. The implemented power supply system exhibits optimum performances such as high power factor, high efficiency, simple configuration and high reliability.
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