A PWM control strategy for low-speed operation of three-level NPC inverter Department of Electrical and Computer Engineering Graduate School, Pusan National University

 

A PWM control strategy for low-speed operation of three-level NPC inverter based on bootstrap gate drive circuit
Jun-Hyung Jung
Department of Electrical and Computer Engineering Graduate School, Pusan National University Abstract
This paper proposes the pulse with modulation (PWM) control strategy for low- speed operation in the three-level neutral-point-clamped (NPC)inverters based onthe bootstrap gate drive circuit
FULL THESIS
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Back-to-Back NPC Switching Technique to Reduce Power Loss of Back-to-Back NPC System for Offshore Wind Farm 2013

Switching Technique to Reduce Power Loss of Back-to-Back NPC System for Off shore Wind Farm HongSeok-Jin
Mechatronics Engineering Cooperation Course Sungkyunkwan University
ABSTRACT
 In this paper,3-LevelNPC is applied as Back-to-Back foroffshore wind farm topology using PMSG.In caseofapplying 3-LevelNPC,each switch can withstand higher voltage than existing 2-Levelinverter,but overallloss of power converters is dramatically increased because amount of switching elemenT is increased.Thus,new switching method issuggested for 3-LevelNPC VSC If suggested method is applied,loss in NPC is minimized.
FULL THESIS
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ZVT Resonant Boost Converter with New Auxiliary Circuit Kim Mo Se Dept. of Mechatronics Engineering Sungkyunkwan University 2013

ABSTRACT
Switch mode power supplies have become smaller and lighter due to higher switching frequency. However, higher switching frequency causes lots of periodic losses at switch turn-ON and turn-OFF,resulting in increasing losses of the whole system.Therefore,many converters have been presented that use resonance circuit to reduces witching losses. In this paper,A new zero voltage transition resonant boost converter is proposed.The conventional boost converter generates switching losses at turn ON and OFF,and this causesa reduction in the whole system’sefficiency.The proposed ZVT resonant boost converter utilizes a  method using an auxiliary circuit with a resonant inductor,capacitor and two auxiliary switch. Therefore the proposed zero voltage transition n resonant boost converter reduces switching losses more than the conventional hard switching converter. Also,the experimentis conducted with the 4[kW],30[kHz]converter which steps up the voltage from 200[V]to 400[V].It is confirmed that the result of the experimentand that of the simulation are same,and the validity of the converter is verified.
FULL THESIS
https://www.mediafire.com/?m14iamz6pzj6kj7

The integrated Operation and Design of the DC Distribution Systems combined Wind Turbine and Photovoltaic Power Systems-ANPC BACK TO BACK CONVERTER

The integrated Operation and Design of the DC
Distribution Systems combined Wind Turbin and
Photovoltaic Power Systems
Shin,Soo Cheol
Department of Electrical and
Computer Engineering
Sungkyunkwan University
FULL PAPER
https://www.mediafire.com/?mf2v9343a99mro1

A Study on the Analysis and Improvement of Power Quality Using Real-time Simulator in Distribution System with Distributed Generation AnHeeJin Interdisciplinary Program in Photovoltaic System Engineering The Graduate School of Sungkyunkwan University

ABSTRACT
The distributed generation has been increased significantly.However,there
are some problems caused by distributed generation such as reverse power flow,
voltage fluctuation and harmonics when it is connected to the distribution
system.Also,we observed the voltage fluctuation in the distribution system
with distributed generation.This paper analyzes the voltage fluctuation according
to the output fluctuation of distributed generation and presents a study on
D-STATCOM which is a shuntdevice used to compensate powerquality on
distribution lines using real-time simulator.The modeling ofthe distribution
system with distributed generation is modeled by using SIMULINK software.
FULL THESIS
LINK1
ftp://dcollection.skku.edu/dcoll/data/service/000000038/000000038744.pdf