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dc.contributor.authorMatas Alcalá, José
dc.contributor.authorMartín Cañadas, María Elena
dc.contributor.authorHoz Casas, Jordi de la
dc.contributor.authorAbusorrah, A.
dc.contributor.authorAl-Turki, Y.A.
dc.contributor.authorAl-Hindawi, M.
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Elèctrica
dc.identifier.citationMatas, J., Martin, M., De La Hoz, J., Abusorrah, A., Al-Turki, Y., Al-Hindawi, M. A family of gradient descent grid frequency estimators for the SOGI filter. "IEEE transactions on power electronics", 4 Setembre 2017, vol. PP, núm. 99, p. 1-13.
dc.description.abstractThis paper applies the adaptive gradient descent method to the second-order generalized integrator (SOGI) filter in order to find an online estimation algorithm for the grid frequency, which leads to the proposal of three possible estimators. One of them is identical to the FLL algorithm reported in literature, which proves that it should be understood as a gradient descent estimation algorithm and not as a "frequency locked loop". The proposed gradient descent estimators are simple and suitable to be implemented into a digital processor with small computational burden. However, due to the SOGI characteristics, the estimators show to be especially sensitive to subharmonic and dc-offset voltage distortion. These problems are removed adopting a cascaded double SOGI approach, which strongly increases the rejection capability to harmonics and enhances the response to voltage sags. Simulation and experimental results are provided to validate the proposed contribution.
dc.format.extent13 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria elèctrica
dc.subject.lcshPhase-locked loops
dc.subject.lcshHarmonic analysis
dc.subject.otherBand-pass filters
dc.subject.otherFiltering theory
dc.subject.otherFrequency estimation
dc.subject.otherFrequency locked loops
dc.subject.othergeneralized integrators
dc.subject.otherGradient descent estimator
dc.subject.otherHarmonic analysis
dc.subject.otheronline grid-frequency estimation
dc.subject.otherPhase locked loops
dc.subject.otherPower harmonic filters
dc.subject.otherpower quality
dc.subject.otherSOGI filter
dc.titleA family of gradient descent grid frequency estimators for the SOGI filter
dc.subject.lemacLlaços de seguiment de fase
dc.contributor.groupUniversitat Politècnica de Catalunya. SEPIC - Sistemes Electrònics de Potència i de Control
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (published version)
local.citation.authorMatas, J.; Martin, M.; De La Hoz, J.; Abusorrah, A.; Al-Turki, Y.; Al-Hindawi, M.
local.citation.publicationNameIEEE transactions on power electronics

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