Power quality improvement by dynamic voltage restorer and unified power quality conditioner using fuzzy logic

Voltage sag and harmonics have significant negative impact on power quality. Propagation of distorted waveform in the system ultimately instigates a range of power quality issues. Protection against this situation is necessary because it adversely affects reliability and quality of power supply. Cus...

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Main Author:	Kakar, Faridullah
Format:	Thesis
Language:	English
Published:	2015
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/54071/4/FaridullahKakarMFKE2015.pdf
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id	my-utm-ep.54071
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spelling	my-utm-ep.540712020-10-18T09:03:28Z Power quality improvement by dynamic voltage restorer and unified power quality conditioner using fuzzy logic 2015-09 Kakar, Faridullah TK Electrical engineering. Electronics Nuclear engineering Voltage sag and harmonics have significant negative impact on power quality. Propagation of distorted waveform in the system ultimately instigates a range of power quality issues. Protection against this situation is necessary because it adversely affects reliability and quality of power supply. Custom Power Devices (CPD) such as Dynamic Voltage Restorer (DVR) and Unified Power Quality Conditioner (UPQC) provide a level of reliability and power quality that is urgently required. The basic purpose of this thesis is to implement new control strategies to mitigate voltage sag/swell and to suppress harmonics to evaluate CPD performance. The CPD system is controlled by Fuzzy Logic Controllers (FLCs) with 49 rules and 25 rules, respectively and their performances are compared with Proportional Integral (PI) controller. This thesis focuses on FLC with fewer rules to avoid complexity, reduce computation time and consume less memory space. The proposed strategy depends on d-q transformation, phase-locked loop synchronization and constant DC link voltage. Simulation results depict better reliability of fuzzy logic techniques with non-linear loads when compared with PI technique. The capability of DVR and UPQC using FLC especially with fewer rules is demonstrated using test models built in Matlab/Simulink software. Both equipments potentially restore sags and improve overall harmonic profile while reducing total harmonic distortion to values within the prescribed criterion set by IEEE standards. The proposed FLC approach with reduced rule base, is superior to PI and FLC with 49 rules, assures effective performance, with normalization and tuning of parameters especially the membership functions and scaling factors. It yielded excellent voltage profile with best possible compensation during system contingencies, conforming to the IEEE standards that affirm FLC as an effective solution for power quality problems. 2015-09 Thesis http://eprints.utm.my/id/eprint/54071/ http://eprints.utm.my/id/eprint/54071/4/FaridullahKakarMFKE2015.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:86198 masters Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Kakar, Faridullah Power quality improvement by dynamic voltage restorer and unified power quality conditioner using fuzzy logic
description	Voltage sag and harmonics have significant negative impact on power quality. Propagation of distorted waveform in the system ultimately instigates a range of power quality issues. Protection against this situation is necessary because it adversely affects reliability and quality of power supply. Custom Power Devices (CPD) such as Dynamic Voltage Restorer (DVR) and Unified Power Quality Conditioner (UPQC) provide a level of reliability and power quality that is urgently required. The basic purpose of this thesis is to implement new control strategies to mitigate voltage sag/swell and to suppress harmonics to evaluate CPD performance. The CPD system is controlled by Fuzzy Logic Controllers (FLCs) with 49 rules and 25 rules, respectively and their performances are compared with Proportional Integral (PI) controller. This thesis focuses on FLC with fewer rules to avoid complexity, reduce computation time and consume less memory space. The proposed strategy depends on d-q transformation, phase-locked loop synchronization and constant DC link voltage. Simulation results depict better reliability of fuzzy logic techniques with non-linear loads when compared with PI technique. The capability of DVR and UPQC using FLC especially with fewer rules is demonstrated using test models built in Matlab/Simulink software. Both equipments potentially restore sags and improve overall harmonic profile while reducing total harmonic distortion to values within the prescribed criterion set by IEEE standards. The proposed FLC approach with reduced rule base, is superior to PI and FLC with 49 rules, assures effective performance, with normalization and tuning of parameters especially the membership functions and scaling factors. It yielded excellent voltage profile with best possible compensation during system contingencies, conforming to the IEEE standards that affirm FLC as an effective solution for power quality problems.
format	Thesis
qualification_level	Master's degree
author	Kakar, Faridullah
author_facet	Kakar, Faridullah
author_sort	Kakar, Faridullah
title	Power quality improvement by dynamic voltage restorer and unified power quality conditioner using fuzzy logic
title_short	Power quality improvement by dynamic voltage restorer and unified power quality conditioner using fuzzy logic
title_full	Power quality improvement by dynamic voltage restorer and unified power quality conditioner using fuzzy logic
title_fullStr	Power quality improvement by dynamic voltage restorer and unified power quality conditioner using fuzzy logic
title_full_unstemmed	Power quality improvement by dynamic voltage restorer and unified power quality conditioner using fuzzy logic
title_sort	power quality improvement by dynamic voltage restorer and unified power quality conditioner using fuzzy logic
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2015
url	http://eprints.utm.my/id/eprint/54071/4/FaridullahKakarMFKE2015.pdf
_version_	1747817678691631104

Power quality improvement by dynamic voltage restorer and unified power quality conditioner using fuzzy logic

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