UNIFIED POWER QUALITY CONDITIONER: DESIGN, SIMULATION AND EXPERIMENTAL ANALYSIS DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING -Ahmet TEKE -PhD THESIS ÇUKUROVA UNIVERSITY- ADANA-TURKEY

UNIFIED POWER QUALITY CONDITIONER: DESIGN, SIMULATION AND EXPERIMENTAL ANALYSIS DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
 Ahmet TEKE
PhD THESIS ÇUKUROVA UNIVERSITY ADANA-TURKEY INSTITUTE OF NATURAL AND APPLIED SCIENCES
 ABSTRACT
 Power quality (PQ) problem can be defined as the deviations of the voltage and/or current from the nominal sine wave. PQ problems generally concern with voltage sags/swells and harmonic currents. Custom Power (CP) devices that mitigate these power quality problems have gained more attention in the recent decades. Unified Power Quality Conditioner (UPQC) is one of the CP devices and it mitigates both load current and supply voltage problems, simultaneously. In this study, UPQC and a new topology of UPQC namely OPEN UPQC are designed, modeled and setup experimentally to mitigate voltage sag/swells and harmonic currents. UPQC consists of Dynamic Voltage Restorer (DVR) and Active Power Filter (APF). An improved voltage compensation controller and new sag/swell detection method based on Enhanced Phase Locked Loop (E-PLL) are presented for DVR. Traditional Instantaneous Reactive Power Theory (IRPT) is optimized for APF control algorithm to compensate harmonic load current under unbalanced and distorted supply voltages. Digital Signal Processor based 6 kVA, 230Vline-lineUPQC and OPEN UPQC prototypes have been developed for laboratory tests. UPQC and OPEN UPQC with proposed controller algorithms effectively compensates the sag/swell in supply voltage by keeping the load voltage amplitude at 0.9-1 per unit and eliminates the load current harmonics by keeping supply current at 5%.

LINK ORIGINAL
http://library.cu.edu.tr/tezler/8411.pdf

Avaliação dos impactos de elevados níveis de penetração da geração fotovoltaica no desempenho de sistemas de distribuição de energia elétrica em regime permanente -Dissertação de Mestrad-Paludo, Juliana Aramizu -Escola de Engenharia de São Carlos-USP-BRASIL

Resumo em portuguêsO emprego de geradores fotovoltaicos (FV) conectados ao sistema de distribuição de energia elétrica tem apresentado um crescimento significativo na última década. No Brasil, sua existência ainda é reduzida, entretanto a previsão é que esta aumente nos próximos anos em função das novas regulamentações estabelecidas pelas concessionárias de energia, com apoio da Agência Nacional de Energia Elétrica. O estudo das consequências trazidas pela conexão massiva de geradores FV possibilita o planejamento correto de operação do sistema de distribuição, evitando assim, a degradação da qualidade da energia elétrica fornecida aos consumidores. Dentro desse contexto, este trabalho possui como objetivo a análise da influência que um elevado nível de penetração de sistemas FV possui em um sistema de distribuição de energia elétrica.
LINK ORIGINAL EN LA WEB
http://www.teses.usp.br/teses/disponiveis/18/18154/tde-23042014-153815/pt-br.php
LINK DIRECTO
http://www.teses.usp.br/teses/disponiveis/18/18154/tde-23042014-153815/publico/DissertPaludoJulianaAramizuCorrig.pdf

Unified Power Quality Conditioner: protection and performance enhancement--Lurie Axente (Thesis) Dublin Institute of Technology-Theses, Ph.D

Unified Power Quality Conditioner: protection and performance enhancement Iurie Axente (Thesis), Dublin Institute of Technology
 Abstract
The proliferation of power electronics-based equipment has produced a significant impact on the quality of electric power supply. Nowadays, much of the equipment is based on power electronic devices, often leading to problems of power quality. At the same time this equipment is typically equipped with microprocessor-based controllers which are quite sensitive to deviations from the ideal sinusoidal line voltage. Conventional power quality mitigation equipment is proving to be inadequate for an increasing number of applications, and this fact has attracted the attention of power engineers to develop dynamic and adjustable solutions to power quality problems. One modern and very promising solution that deals with both load current and supply voltage imperfections is the Unified Power Quality Conditioner (UPQC). This thesis investigates the development of UPQC protection scheme and control algorithms for enhanced performance. This work is carried out on a 12 kVA prototype UPQC. In order to protect the series inverter of the UPQC from overvoltage and overcurrent during short circuits on the load side of the UPQC, the secondary of the series transformer has to be short-circuited in a reasonably short time (microseconds). A hardware-based UPQC protection scheme against the load side short circuits is derived and its implementation and effectiveness is investigated. The main protection element is a crowbar connected across the secondary of the series transformer and consisting of a pair of antiparallel connected thyristors, which is governed by a very simple Zener diode based control circuit. Also, the software-based UPQC protection approach is investigated, the implementation of which does not require additional hardware.
LINK ORIGINAL WEB
http://arrow.dit.ie/engdoc/11/
LINK DIRECTO
http://arrow.dit.ie/cgi/viewcontent.cgi?article=1010&context=engdoc

FONTE ININTERRUPTA DE ENERGIA APLICADA A SISTEMAS COM CARGAS NÃO LINEARES Kimon Stylianos Pediatidakis -UNIVERSIDADE FEDERAL DO ABC Curso de Pós-graduação em Engenharia Elétrica

LINK ORIGINAL
http://ppgee.ufabc.edu.br/dissertacoes/kimon_pediatidakis.pdf

ESTRATÉGIAS DE CONTROLE REPETITIVO PARA APLICAÇÃO EM SISTEMAS DE ALIMENTAÇÃO ININTERRUPTA DE ENERGIA-Gnoatto, Claudio Lucas-Programa de Pós-Graduação em Engenharia Elétrica, Universidade Tecnológica Federal do Paraná.

ESTRATÉGIAS DE CONTROLE REPETITIVO PARA APLICAÇÃO EM SISTEMAS DE ALIMENTAÇÃO ININTERRUPTA DE ENERGIA 
 CLAUDIO LUCAS GNOATTO 
 DISSERTAÇÃO DE MESTRADO 
 UNIVERSIDADE TECNOLÓGICA FEDERAL DO PARANÁ PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA ELÉTRICA-BRASIL

LINK ORIGINAL
http://repositorio.utfpr.edu.br/jspui/handle/1/222
LINK DIRECTO PDF
http://repositorio.utfpr.edu.br/jspui/handle/1/222