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dc.contributor.advisorJulian, Alexander L.
dc.contributor.authorPierce, Seth J.
dc.dateSep-13
dc.date.accessioned2013-11-20T23:36:23Z
dc.date.available2013-11-20T23:36:23Z
dc.date.issued2013-09
dc.identifier.urihttp://hdl.handle.net/10945/37693
dc.descriptionApproved for public release; distribution is unlimiteden_US
dc.description.abstractThe Department of Defense (DoD) is increasing its demand for reliable renewable energy sources. The doubly-fed induction generator (DFIG) is widely used to extract electrical energy from wind and is a useful means for the DoD to achieve its renewable energy goals. The DFIG is susceptible to electric grid voltage harmonics, which is a potential obstacle for implementing stable wind-energy systems. Two existing rotor voltage controllers are modeled in this thesis for eventual implementation in a laboratory DFIG wind energy system. The first controller uses multiple proportional-integral (PI) controllers to filter out the fifth and seventh stator current harmonics. Each PI controller operates in a reference frame that rotates in synchronicity with the harmonic that is being filtered. The second controller operates in the synchronous reference frame and simultaneously filters both the fifth and seventh stator current harmonics using a double integrator called a proportional-resonant controller (PR). The PI controller is shown to be more effective at eliminating the stator current than the PR controller but has a slower reaction time. The PR controller requires fewer computations but has more stability concerns. Both controllers reduce torque oscillations resulting from the grid distortion by approximately the same amount.en_US
dc.publisherMonterey, California: Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, may not be copyrighted.en_US
dc.titleReducing stator current harmonics for a doubly-fed induction generator connected to a distorted griden_US
dc.typeThesisen_US
dc.contributor.secondreaderCristi, Roberto
dc.contributor.departmentElectrical And Computer Engineering
dc.subject.authordoubly-fed induction generatoren_US
dc.subject.authorharmonic distortionen_US
dc.subject.authorresonant controlleren_US
dc.description.serviceLieutenant, United States Navyen_US
etd.thesisdegree.nameMaster Of Science In Electrical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineElectrical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US


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