Show simple item record

dc.contributor.advisorFahimi, Babak
dc.creatorNiraula, Manish
dc.date.accessioned2018-08-15T12:12:44Z
dc.date.available2018-08-15T12:12:44Z
dc.date.created2018-05
dc.date.issued2018-05
dc.date.submittedMay 2018
dc.identifier.urihttp://hdl.handle.net/10735.1/5945
dc.description.abstractThis research focuses on the stand-alone operation of doubly fed induction generator (DFIG) with variable stator frequency. In stand-alone configuration, the stator side is connected to a three phase diode rectifier and a stand-alone electrical load. The dc output voltage regulation is achieved by applying stator flux oriented control scheme in synchronous reference frame. The losses that occur in the power electronics components depend on the current flowing through the switches and so in the power rating of the converter. WECS based on DFIG are designed for variable speed operation. So, the main objective of the DFIG control strategy is to regulate the generator speed so that maximum amount of wind energy is extracted for the given speed of the wind. But the generator cannot be run in full speed range if the converter rating used is smaller than the rated power of the turbine. Thus, the speed range of the DFIG is determined by the converter rating and hence the slip is limited using variable frequency operation of DFIG to reduce the converter rating and extend the speed range of operation. The dc-link capacitor voltage is regulated to a constant rated value and so the stator voltage amplitude is also constant. The flux-frequency product being constant, a variation in stator flux magnitude results in a frequency variation. So, the stator frequency can be scheduled in such a way that the output power is maximized. Some simulation tests have been run during this work to find the optimal stator frequency for a fixed range of speed and used as a look up table to improve the power conversion efficiency of the whole generator system.
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.rights©2018 The Author. Digital access to this material is made possible by the Eugene McDermott Library. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
dc.subjectInduction generators
dc.subjectWind energy conversion systems
dc.subjectEnergy conversion
dc.subjectVoltage regulators
dc.subjectCapacitors
dc.titleVariable Frequency Operation of Stand-Alone Doubly Fed Induction Generator Connected to the DC system
dc.typeThesis
dc.date.updated2018-08-15T12:12:45Z
dc.type.materialtext
thesis.degree.grantorThe University of Texas at Dallas
thesis.degree.departmentElectrical Engineering
thesis.degree.levelMasters
thesis.degree.nameMSEE


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record