Sensitivity of a frequency scanning program to variations in system resistances

Persistent Link:
http://hdl.handle.net/10150/276657
Title:
Sensitivity of a frequency scanning program to variations in system resistances
Author:
Butt, Robert Samuel, 1959-
Issue Date:
1988
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Various computer programs are currently used by electric utilities to determine if potential subsynchronous resonance problems exist which can impact turbine-generators. One of the most popular of these is the frequency scanning program. The representative transmission system input data for these programs are generally based on constant temperature and frequency. However, as conductor temperatures and applied frequencies fluctuate, the resistances also change. This thesis investigates the effects that resistance variations, due to temperature and frequency, have on frequency scanning results. The maximum resistance change (increased and decreased) from the standard value is determined and applied to the transmission lines in four study system cases. The frequency scan output for the modified cases is used to determine if torsional interaction has become more severe. It is found that, under extreme conditions, the net system damping can decrease by over one hundred percent.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Subsynchronous resonance.; Frequency response (Electrical engineering)
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Electrical and Computer Engineering
Degree Grantor:
University of Arizona
Advisor:
Schooley, Larry C.; Knickerbocker, James L.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleSensitivity of a frequency scanning program to variations in system resistancesen_US
dc.creatorButt, Robert Samuel, 1959-en_US
dc.contributor.authorButt, Robert Samuel, 1959-en_US
dc.date.issued1988en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractVarious computer programs are currently used by electric utilities to determine if potential subsynchronous resonance problems exist which can impact turbine-generators. One of the most popular of these is the frequency scanning program. The representative transmission system input data for these programs are generally based on constant temperature and frequency. However, as conductor temperatures and applied frequencies fluctuate, the resistances also change. This thesis investigates the effects that resistance variations, due to temperature and frequency, have on frequency scanning results. The maximum resistance change (increased and decreased) from the standard value is determined and applied to the transmission lines in four study system cases. The frequency scan output for the modified cases is used to determine if torsional interaction has become more severe. It is found that, under extreme conditions, the net system damping can decrease by over one hundred percent.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectSubsynchronous resonance.en_US
dc.subjectFrequency response (Electrical engineering)en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineElectrical and Computer Engineeringen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorSchooley, Larry C.en_US
dc.contributor.advisorKnickerbocker, James L.en_US
dc.identifier.proquest1333228en_US
dc.identifier.oclc21353725en_US
dc.identifier.bibrecord.b18412907en_US
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