Harmonic current effect on the sizing of neutral conductor of low voltage distribution network

Power system harmonic phenomenon was an old problem, but with renewed and unprecedented threat. This matter deserved to get a refreshing look as proliferation of non-linear loads, one of the harmonic sources, has been increasing exponentially especially at low voltage network. Despite this fact, re...

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Main Author:	Azharudin, Mukhtaruddin
Format:	Thesis
Language:	English
Subjects:	Power system Harmonics Harmonics (Electric waves) Total Harmonic Distortion (THD) Low voltage network
Online Access:	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/59417/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/59417/2/Full%20text.pdf
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spelling	my-unimap-594172019-04-10T03:22:49Z Harmonic current effect on the sizing of neutral conductor of low voltage distribution network Azharudin, Mukhtaruddin Dr. Muzamir Isa Power system harmonic phenomenon was an old problem, but with renewed and unprecedented threat. This matter deserved to get a refreshing look as proliferation of non-linear loads, one of the harmonic sources, has been increasing exponentially especially at low voltage network. Despite this fact, research into the problem seemed to be declining. Firstly the effect of harmonic current in low voltage, balanced three-phase system has been researched. Cable sizes involved in this study were 2.5 mm2 to 16 mm2. This level of system has been thought to be important since interaction between users, trained or not, and systems was commonly taken place. Secondly how harmonic eventually neutral conductor sizing has been studied. It has been confirmed that with the increased of harmonic content, neutral current value would be increased. In addition, neutral conductor initial ampacity has been found to be de-rated under the presence of harmonic. Harmonic derating factor, heating effect method, proposed techniques by Arthur and Shanahan, followed by Chindris as well as guidelines from IEC and NEC standards have been identified to be applied to determine the neutral conductor sizing under harmonic presence. Analysis of results from each method as well as their performance has been done. Simulation and analysis using Fast Fourier Transform has been carried out using MATLAB environment. Comparison between each method including comparison to the basic conductor sizing formulation has also been carried out. It has been concluded that each method, including those proposed by standards, had its own shortcomings. By further analysing results from two of the methods, two new mathematical relationships that correlate harmonic content and neutral conductor sizing have been developed. One of the two formulations has been identified as the best based on several criteria. This formula contributes towards correct, faster and shorter step of determining neutral conductor sizing under harmonic presence. Universiti Malaysia Perlis (UniMAP) 2015 Thesis en http://dspace.unimap.edu.my:80/xmlui/handle/123456789/59417 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/59417/1/Page%201-24.pdf 1ee7de3c176f14854d48fa1b61297e1f http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/59417/2/Full%20text.pdf 562553670cbe65ac3e1aa8f589532b57 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/59417/3/license.txt 8a4605be74aa9ea9d79846c1fba20a33 Power system Harmonics Harmonics (Electric waves) Total Harmonic Distortion (THD) Low voltage network School of Electrical Systems Engineering
institution	Universiti Malaysia Perlis
collection	UniMAP Institutional Repository
language	English
advisor	Dr. Muzamir Isa
topic	Power system Harmonics Harmonics (Electric waves) Total Harmonic Distortion (THD) Low voltage network
spellingShingle	Power system Harmonics Harmonics (Electric waves) Total Harmonic Distortion (THD) Low voltage network Azharudin, Mukhtaruddin Harmonic current effect on the sizing of neutral conductor of low voltage distribution network
description	Power system harmonic phenomenon was an old problem, but with renewed and unprecedented threat. This matter deserved to get a refreshing look as proliferation of non-linear loads, one of the harmonic sources, has been increasing exponentially especially at low voltage network. Despite this fact, research into the problem seemed to be declining. Firstly the effect of harmonic current in low voltage, balanced three-phase system has been researched. Cable sizes involved in this study were 2.5 mm2 to 16 mm2. This level of system has been thought to be important since interaction between users, trained or not, and systems was commonly taken place. Secondly how harmonic eventually neutral conductor sizing has been studied. It has been confirmed that with the increased of harmonic content, neutral current value would be increased. In addition, neutral conductor initial ampacity has been found to be de-rated under the presence of harmonic. Harmonic derating factor, heating effect method, proposed techniques by Arthur and Shanahan, followed by Chindris as well as guidelines from IEC and NEC standards have been identified to be applied to determine the neutral conductor sizing under harmonic presence. Analysis of results from each method as well as their performance has been done. Simulation and analysis using Fast Fourier Transform has been carried out using MATLAB environment. Comparison between each method including comparison to the basic conductor sizing formulation has also been carried out. It has been concluded that each method, including those proposed by standards, had its own shortcomings. By further analysing results from two of the methods, two new mathematical relationships that correlate harmonic content and neutral conductor sizing have been developed. One of the two formulations has been identified as the best based on several criteria. This formula contributes towards correct, faster and shorter step of determining neutral conductor sizing under harmonic presence.
format	Thesis
author	Azharudin, Mukhtaruddin
author_facet	Azharudin, Mukhtaruddin
author_sort	Azharudin, Mukhtaruddin
title	Harmonic current effect on the sizing of neutral conductor of low voltage distribution network
title_short	Harmonic current effect on the sizing of neutral conductor of low voltage distribution network
title_full	Harmonic current effect on the sizing of neutral conductor of low voltage distribution network
title_fullStr	Harmonic current effect on the sizing of neutral conductor of low voltage distribution network
title_full_unstemmed	Harmonic current effect on the sizing of neutral conductor of low voltage distribution network
title_sort	harmonic current effect on the sizing of neutral conductor of low voltage distribution network
granting_institution	Universiti Malaysia Perlis (UniMAP)
granting_department	School of Electrical Systems Engineering
url	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/59417/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/59417/2/Full%20text.pdf
_version_	1747836834684076032

Harmonic current effect on the sizing of neutral conductor of low voltage distribution network

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