Mitigation of ferroresonance in power transmission network by applying UPFC and STATCOM

Ferroresonance phenomenon occurs in electrical circuits which are consisting of magnetizing cores, such as in the transmission and distribution networks with transformers, electrical machines or reactors. Transformers often operate close to the knee point of the magnetizing curve under normal condit...

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Main Author:	Tavalaei, Jalal
Format:	Thesis
Language:	English
Published:	2012
Subjects:	T Technology (General)
Online Access:	http://eprints.utm.my/id/eprint/32275/1/JalalTavalaeiMFKE2012.pdf
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id	my-utm-ep.32275
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spelling	my-utm-ep.322752017-07-13T06:37:54Z Mitigation of ferroresonance in power transmission network by applying UPFC and STATCOM 2012 Tavalaei, Jalal T Technology (General) Ferroresonance phenomenon occurs in electrical circuits which are consisting of magnetizing cores, such as in the transmission and distribution networks with transformers, electrical machines or reactors. Transformers often operate close to the knee point of the magnetizing curve under normal condition. Therefore any sudden change in voltage or current can change the operating point on the magnetizing curve and saturation may result. This phenomenon is reflected in the change of the equivalent nonlinear reactance of the transformer. Now, if the value of the saturated reactance reaches a value such that it causes resonance with the equivalent capacitance of the network, then an over current or over voltage may occur. Transformers, electrical motors, reactors and generators are examples of equipment having magnetizing cores. Ferroresonance may cause melting of the lamination of the transformer or electrical machine which eventually may lead to the failure of the equipment. This type of fault can create long time interruptions. Possible causes of ferroresonance are switching, faults especially single line to ground or double line to ground, lightning, and Ferranti effect. Although some techniques had been applied to mitigate ferroresonance on CVTs, methods to mitigate ferroresonance on power transformers are almost not studied or reported. This report initially introduces the ferroresonance phenomenon, its definition and circumstances where it occurs. The software used for the simulation is then introduced, whereby the modeling work of the components relevant to the present work is discussed. The simulation work then follows, where suitable circuits for ferroresonance simulation were identified, including those for the mitigation techniques, namely the UPFC and STATCOM. The circuits used to represent the network are introduced and the simulation results are presented and discussed. The UPFC in mode-1 and the STATCOM techniques of mitigation had been shown to successfully mitigate the ferroresonance. 2012 Thesis http://eprints.utm.my/id/eprint/32275/ http://eprints.utm.my/id/eprint/32275/1/JalalTavalaeiMFKE2012.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:68967?site_name=Restricted Repository masters Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	T Technology (General)
spellingShingle	T Technology (General) Tavalaei, Jalal Mitigation of ferroresonance in power transmission network by applying UPFC and STATCOM
description	Ferroresonance phenomenon occurs in electrical circuits which are consisting of magnetizing cores, such as in the transmission and distribution networks with transformers, electrical machines or reactors. Transformers often operate close to the knee point of the magnetizing curve under normal condition. Therefore any sudden change in voltage or current can change the operating point on the magnetizing curve and saturation may result. This phenomenon is reflected in the change of the equivalent nonlinear reactance of the transformer. Now, if the value of the saturated reactance reaches a value such that it causes resonance with the equivalent capacitance of the network, then an over current or over voltage may occur. Transformers, electrical motors, reactors and generators are examples of equipment having magnetizing cores. Ferroresonance may cause melting of the lamination of the transformer or electrical machine which eventually may lead to the failure of the equipment. This type of fault can create long time interruptions. Possible causes of ferroresonance are switching, faults especially single line to ground or double line to ground, lightning, and Ferranti effect. Although some techniques had been applied to mitigate ferroresonance on CVTs, methods to mitigate ferroresonance on power transformers are almost not studied or reported. This report initially introduces the ferroresonance phenomenon, its definition and circumstances where it occurs. The software used for the simulation is then introduced, whereby the modeling work of the components relevant to the present work is discussed. The simulation work then follows, where suitable circuits for ferroresonance simulation were identified, including those for the mitigation techniques, namely the UPFC and STATCOM. The circuits used to represent the network are introduced and the simulation results are presented and discussed. The UPFC in mode-1 and the STATCOM techniques of mitigation had been shown to successfully mitigate the ferroresonance.
format	Thesis
qualification_level	Master's degree
author	Tavalaei, Jalal
author_facet	Tavalaei, Jalal
author_sort	Tavalaei, Jalal
title	Mitigation of ferroresonance in power transmission network by applying UPFC and STATCOM
title_short	Mitigation of ferroresonance in power transmission network by applying UPFC and STATCOM
title_full	Mitigation of ferroresonance in power transmission network by applying UPFC and STATCOM
title_fullStr	Mitigation of ferroresonance in power transmission network by applying UPFC and STATCOM
title_full_unstemmed	Mitigation of ferroresonance in power transmission network by applying UPFC and STATCOM
title_sort	mitigation of ferroresonance in power transmission network by applying upfc and statcom
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2012
url	http://eprints.utm.my/id/eprint/32275/1/JalalTavalaeiMFKE2012.pdf
_version_	1747815963522236416

Mitigation of ferroresonance in power transmission network by applying UPFC and STATCOM

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