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Simultaneous mitigation of subsynchronous resonance and subsynchronous interaction using offshore and doubly-fed induction generator-based wind farms

dc.contributor.advisorFaried, Sherif O.en_US
dc.contributor.committeeMemberKarki, Rajeshen_US
dc.contributor.committeeMemberMehr, Aryan S.en_US
dc.contributor.committeeMemberOguocha, Ikechukwuka N.en_US
dc.creatorOgemuno, Emmanuelen_US
dc.date.accessioned2014-08-22T12:00:16Z
dc.date.available2014-08-22T12:00:16Z
dc.date.created2014-07en_US
dc.date.issued2014-08-21en_US
dc.date.submittedJuly 2014en_US
dc.description.abstractSubsynchronous resonance (SSR) is one of the major obstacles for the wide spread of high degrees (60% and higher) of series capacitor compensation. Recently, a new obstacle, namely Subsynchronous Interaction (SSI) has been added to the list after the Zorillo Gulf wind farm incident in Texas in October 2009. SSI is due to the interaction between large Doubly Fed Induction Generator (DFIG)-based wind farms and series capacitor compensated transmission systems. In integrated power systems incorporating series capacitor compensated transmission lines and high penetration of wind energy conversion systems, especially DFIG-based wind farms, SSR and SSI could occur concurrently as a result of some system contingences. Therefore, mitigating SSR and SSI is an important area of research and development targeting at developing practical and effective countermeasures. This thesis reports the results of digital time-domain simulation studies that are carried out to investigate the potential use of offshore and DFIG-based wind farms for simultaneous mitigation of SSR and SSI. This is achieved through introducing supplemental control signals in the reactive power control loops of the grid side converters of the DFIG wind turbines or the HVDC onshore Modular Multilevel Converter (MMC) connecting the offshore wind farm to the grid. In this context, two supplemental controls designated as Supplemental Controls I and II are examined. Supplemental Control I introduces a signal in the HVDC onshore converter to damp both SSR and SSI oscillations. On the other hand, Supplemental Control II introduces a signal in the HVDC onshore converter for damping SSR oscillations and another signal in the grid side converters of the DFIG wind turbines for damping SSI oscillations. Time-domain simulations are conducted on a benchmark model using the ElectroMagnetic Transients program (EMTP-RV). The results of the investigations have demonstrated that the presented two supplemental controls are very effective in mitigating the SSR and SSI phenomena at different system contingencies and operating conditions.en_US
dc.identifier.urihttp://hdl.handle.net/10388/ETD-2014-07-1636en_US
dc.language.isoengen_US
dc.subjectSubsynchronous resonance Subsynchronous interactionen_US
dc.titleSimultaneous mitigation of subsynchronous resonance and subsynchronous interaction using offshore and doubly-fed induction generator-based wind farmsen_US
dc.type.genreThesisen_US
dc.type.materialtexten_US
thesis.degree.departmentElectrical and Computer Engineeringen_US
thesis.degree.disciplineElectrical Engineeringen_US
thesis.degree.grantorUniversity of Saskatchewanen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science (M.Sc.)en_US

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