High Precision Dynamic Power System Frequency Estimation Algorithm Based on Phasor Approach

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dc.contributor.authorZhang, Xuanen
dc.contributor.committeechairLiu, Yiluen
dc.contributor.committeememberCenteno, Virgilio A.en
dc.contributor.committeememberBostian, Charles W.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:30:57Zen
dc.date.adate2004-02-11en
dc.date.available2014-03-14T20:30:57Zen
dc.date.issued2004-01-16en
dc.date.rdate2006-02-11en
dc.date.sdate2004-01-20en
dc.description.abstractAn internet-based, real-time, Global Positioning System (GPS) ---synchronized relative to the wide-area frequency-monitoring network (FNET) ---has been developed at Virginia Tech. In this FNET system, an algorithm that employs the relationship between phasor angles and deviated frequency [13] is used to calculate both frequency and its rate of change. Tests of the algorithm disclose that, for non-pure sinusoidal input (as compared to pure sinusoidal input), significant errors in the output frequency will result. Three approaches for increasing the accuracy of the output frequency were compared. The first---increasing the number of samples per cycle N---proved ineffective. The second---using the average of the first estimated frequencies rather than the instant first estimated frequency as the resampling frequency---produces a moderate increase in accuracy of the frequency estimation. The third---multiple resampling---significantly increased accuracy. But both the second and the third become ineffective to the extent the input is not pure sinusoidal. From a practical standpoint, attention needs to be paid toward eliminating noise in the input data from the power grid so as to make it more purely sinusoidal. Therefore, it will be worthwhile to test more sophisticated digital filters for processing the input data before feeding it to the algorithm.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-01202004-163949en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-01202004-163949/en
dc.identifier.urihttp://hdl.handle.net/10919/31001en
dc.publisherVirginia Techen
dc.relation.haspartxuanzhangthesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectphase-shiften
dc.subjectmoving averagingen
dc.subjectaveragingen
dc.subjectDFTen
dc.titleHigh Precision Dynamic Power System Frequency Estimation Algorithm Based on Phasor Approachen
dc.typeThesisen
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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