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dc.contributor.authorZhang, Xuanen_US
dc.date.accessioned2014-03-14T20:30:57Z
dc.date.available2014-03-14T20:30:57Z
dc.date.issued2004-01-16en_US
dc.identifier.otheretd-01202004-163949en_US
dc.identifier.urihttp://hdl.handle.net/10919/31001
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_US
dc.publisherVirginia Techen_US
dc.relation.haspartxuanzhangthesis.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectphase-shiften_US
dc.subjectmoving averagingen_US
dc.subjectaveragingen_US
dc.subjectDFTen_US
dc.titleHigh Precision Dynamic Power System Frequency Estimation Algorithm Based on Phasor Approachen_US
dc.typeThesisen_US
dc.contributor.departmentElectrical and Computer Engineeringen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairLiu, Yiluen_US
dc.contributor.committeememberCenteno, Virgilio A.en_US
dc.contributor.committeememberBostian, Charles W.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-01202004-163949/en_US
dc.date.sdate2004-01-20en_US
dc.date.rdate2006-02-11
dc.date.adate2004-02-11en_US


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