Voltage stability index for under voltage load sheeding scheme

Power system is a nonlinear system that operates in a constantly changing environment. When subjected to a disturbance, the stability of the system depends on the initial operating condition as well as the nature of the disturbance. During fault occurrences, the system may experience a change in fre...

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Main Author:	Zahidi, Rubiatul Adawiyah
Format:	Thesis
Published:	2010
Subjects:	TK Electrical engineering Electronics Nuclear engineering
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id	my-utm-ep.27042
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spelling	my-utm-ep.270422017-08-23T08:52:14Z Voltage stability index for under voltage load sheeding scheme 2010 Zahidi, Rubiatul Adawiyah TK Electrical engineering. Electronics Nuclear engineering Power system is a nonlinear system that operates in a constantly changing environment. When subjected to a disturbance, the stability of the system depends on the initial operating condition as well as the nature of the disturbance. During fault occurrences, the system may experience a change in frequency or a change in voltage levels or a combination of both. These may range from localize instability event to a wide system collapse. With the introduction of protection relays, theoretically these faults may be isolated. Nevertheless, uncertainties in power system operation and cascading failures may lead to situations where existing security measures cannot cope. Hence, the last possible mitigating action in this case would be using Under Voltage Load Shedding (UVLS) schemes. UVLS has been successfully deployed in many systems throughout the world to protect local systems from voltage collapse. This is particularly true if the system conditions and the contingencies leading to voltage instabilities are of low probability, but would result in serious consequences. This is analogous to Under Frequency Load Shedding (UFLS), which has become a common utility practice to cater to extreme situations resulting in generation deficiency and underfrequency. However, the locations and how much load to shed requires expert knowledge and experience working with the power grid. Hence, the research proposed to utilize an established index called Fast Voltage Stability Index (FVSI) to act as a numerical verification of the shedding locations. The research work done shows that the FVSI index can be used and load shedding at these points does improve the stability of the system. However, it is worth noting that the analysis conducted is only based upon static analysis hence the dynamic behaviour of the system is not included. 2010 Thesis http://eprints.utm.my/id/eprint/27042/ masters Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Zahidi, Rubiatul Adawiyah Voltage stability index for under voltage load sheeding scheme
description	Power system is a nonlinear system that operates in a constantly changing environment. When subjected to a disturbance, the stability of the system depends on the initial operating condition as well as the nature of the disturbance. During fault occurrences, the system may experience a change in frequency or a change in voltage levels or a combination of both. These may range from localize instability event to a wide system collapse. With the introduction of protection relays, theoretically these faults may be isolated. Nevertheless, uncertainties in power system operation and cascading failures may lead to situations where existing security measures cannot cope. Hence, the last possible mitigating action in this case would be using Under Voltage Load Shedding (UVLS) schemes. UVLS has been successfully deployed in many systems throughout the world to protect local systems from voltage collapse. This is particularly true if the system conditions and the contingencies leading to voltage instabilities are of low probability, but would result in serious consequences. This is analogous to Under Frequency Load Shedding (UFLS), which has become a common utility practice to cater to extreme situations resulting in generation deficiency and underfrequency. However, the locations and how much load to shed requires expert knowledge and experience working with the power grid. Hence, the research proposed to utilize an established index called Fast Voltage Stability Index (FVSI) to act as a numerical verification of the shedding locations. The research work done shows that the FVSI index can be used and load shedding at these points does improve the stability of the system. However, it is worth noting that the analysis conducted is only based upon static analysis hence the dynamic behaviour of the system is not included.
format	Thesis
qualification_level	Master's degree
author	Zahidi, Rubiatul Adawiyah
author_facet	Zahidi, Rubiatul Adawiyah
author_sort	Zahidi, Rubiatul Adawiyah
title	Voltage stability index for under voltage load sheeding scheme
title_short	Voltage stability index for under voltage load sheeding scheme
title_full	Voltage stability index for under voltage load sheeding scheme
title_fullStr	Voltage stability index for under voltage load sheeding scheme
title_full_unstemmed	Voltage stability index for under voltage load sheeding scheme
title_sort	voltage stability index for under voltage load sheeding scheme
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2010
_version_	1747815573349203968

Voltage stability index for under voltage load sheeding scheme

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