Stanford Seminar - Joshua R. Smith of University of Washington

Publicado em 13/06/2013

"Wireless Power Transfer and RF Energy Harvesting: New Options for System Designers" -Joshua R. Smith, University of Washington
Colloquium on Computer Systems Seminar Series (EE380) presents the current research in design, implementation, analysis, and use of computer systems. Topics range from integrated circuits to operating systems and programming languages. It is free and open to the public, with new lectures each week.

Power Quality Improvement of Single-Phase Grid-Connected Photovoltaic Inverter Chungnam National University SOUTH KOREA

Power Quality Improvement of Single-Phase
Grid-Connected Photovoltaic Inverter

Department of Information and Communications Engineering
Graduate School Chungnam National University
By Trung-Kien Vu
Advisor Se-Jin Seong
Submitted to the Graduate School in Partial Fulfillment of the Requirements
for the Degree of Doctor of Philosophy
February 2011
Department of Information and Communications Engineering
Graduate School Chungnam National University

The economical and environmental impacts of fossil fuels have
forced society to investigate sustainable solutions. The interest has
focused on the renewable energy sources since the green and clean
benefits. Consequently, investments in research and development in the
field of power electronics have increased proportionally, especially in
high voltage and high power grid-connected systems.
The distributed power generation (DG) systems are becoming
more common as the need for electric power increases because of
taking advantage of using different energy sources such as wind and
solar. A few examples are hybrid cars, solar houses or hospitals in
remote areas where providing clean, efficient and reliable electric
power is critical to the loads. In such systems, the power is distributed
from the source side to the load side via power electronic converters in
the system. At low and medium power applications, the task is often
left to single-phase inverters where they are the only interface between
sources connected to dc bus and loads connected to an ac bus. This
dissertation investigates the power quality improvements to properly
regulate the power flow between renewable source and the utility
network.
FULL THESIS
http://www.mediafire.com/view/omt0iae8sei5msx/INVERTER-PHOTOVOLTAIC.pdf

CONIMERA 2013 29 DE MAYO Lima-Perú:Congreso Nacional de Ingeniería Eléctrica,Mecánica y Ramas Afines (XX CONIMERA 2013)

Non-isolated Single Phase Uninterruptible Power Supply (UPS) System Muhammad Aamir Advisor: Prof. Dr. Hee-Jun Kim Department of Electronics, Electrical, Control School of Engineering Hanyang University South Korea

MASTERS THESIS
Non-isolated Single Phase Uninterruptible Power
Supply (UPS) System

Advisor: Prof. Hee Jun Kim
This paper is presented as Master of Science Degree Thesis
August, 2011
Graduate School of Engineering,
Department of Electronics, Electrical, Control, and
Instrumentation Engineering
Hanyang University

Abstract
Non-isolated Single Phase Uninterruptible Power Supply (UPS)
System
Muhammad Aamir
Advisor: Prof. Dr. Hee-Jun Kim
Department of Electronics, Electrical, Control,
& Instrumentation Engineering
Graduate School of Engineering
Hanyang University
South Korea
In this thesis, a high performance single phase transformer-less online
uninterruptible power supply (UPS) is proposed. The use of the bidirectional
buck-boost converter with high conversion ratio not only reduces the number
of batteries but also ensures a transformer-less system. The rectifier has
capability of power factor correction and provides regulated DC link voltage
whereas the inverter provides a regulated sinusoidal output voltage to the
load. In order to control the transient effect, efficient control scheme is
adopted in the system. The overall efficiency of the system is improved with
significant reduction in size and weight of the system due to decrease
number of batteries. Qualitative analysis and experimental results obtained
with a 500VA prototype shows a normal efficiency of over 94% and an input
power factor of over 99%.
READ FULL THESIS
http://www.mediafire.com/?2cjcj2dbqcqatc4

3kW-class three-phase interleaved insulated Bi-directional DC-DC converter analysis and design

Analysis and Design of Three-Phase Isolated Bi-directional
    Interleaved DC-DC Converter

Taesub Kang

Department of Electrical Engineering,Graduate School
Chungnam National University Daejeon,Korea
(Supervised by Professor Hanju Cha)
This thesis presents an implementation of three-phase DC-DC
converter which converses the low  input voltage level to a high
voltage level and is used in fuel-cell and battery applications.
For the purpose of highly efficient voltage conversion,two topologies
has been analyzed and implemented a basis of three-phase DC-DC converter.
Firstly,the PWM  and operating principles has been explained for
three-phase current-type active clamp DC-DC converter,where all
switches are operated in ZVS operation because ofthe active clamp
circuit and leakage inductor of converter.Also,by using  -back
method astable pre-charging can bee stablished even in case of the
load variation.By connecting two PI controllers in series,the output
voltage and the input current values has been maintained during the
load variation. In this thesis,a 800W  three-phase current-fed active
clamp DC-DC converter propotype,which connects a fuel-cell with
an grid-connected inverter,has been implemented and verified in a
real three-phase grid-connected application.
Secondly,an interleaved method has been applied in to the existing
converter for implementing a three-phase interleaved bi-directional
DC-DC  converter The  three-phase  full-bridge  rectifier of the
interleaved DC-DC  boost converter has been modified by using
IGBT's reverse-directional diode,hence the analysis and design of
bi-directionalconverter,which operates in two modes:boost mode
and buck mode operation,has been carried out.The PWM operation
and  interleaved DC-DC converter has been explained.
All switches  of  three-phase  interleaved  bi-directional DC-DC
converter are worked in ZVS operation.As a result,the effect of
reducing converter's input current's ripple and ZVS operation of all
switches at1kW power is about 95%.1kW and 3kW converters were
directly designed and the converter's prototype such as PCB,input
and leakage inductor,transformer design process have been described.
Finally, the  3kW   three-phase  interleaved  bi-directional DC-DC
converter has been verified in stable operation.In conclusion,this
converter has been verified to be suitable for high-power conversion
equipment in batterycharger/dis-charger,UPS and hybrid car.
FULL THESIS
http://www.mediafire.com/?6rabq63bg0t4b6b