A Family of Gradient Descent Grid Frequency Estimators for the SOGI Filter

This 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 frequency-locked loop alg...

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Published inIEEE transactions on power electronics Vol. 33; no. 7; pp. 5796 - 5810
Main Authors Matas, Jose, Martin, Helena, de la Hoz, Jordi, Abusorrah, Abdullah, Al-Turki, Yusuf A., Al-Hindawi, Mohammed
Format Journal Article Publication
LanguageEnglish
Published New York IEEE 01.07.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Adaptive filters
Algorithms
Band-pass filters
Computer simulation
Enginyeria elèctrica
Estimators
Filtering theory
Frequency estimation
Frequency locked loops
generalized integrators
Generalized integrators (GIs)
Gradient descent estimator
Harmonic analysis
Llaços de seguiment de fase
Microprocessors
Neural networks
online grid-frequency estimation
Phase locked loops
Power harmonic filters
power quality
second-order generalized integrator (SOGI) filter
SOGI filter
Voltage distortion
Voltage sags
Àrees temàtiques de la UPC
Online AccessGet full text
ISSN0885-8993
1941-0107
DOI10.1109/TPEL.2017.2748920

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Abstract This 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 frequency-locked loop algorithm reported in the 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.
AbstractList This 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. Peer Reviewed
This 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 frequency-locked loop algorithm reported in the 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.
Author Martin, Helena
Al-Turki, Yusuf A.
Abusorrah, Abdullah
de la Hoz, Jordi
Al-Hindawi, Mohammed
Matas, Jose
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  organization: Department of Electrical and Computer Engineering, Renewable Energy Research Group, King Abdulaziz University, Jeddah, Saudi Arabia
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Snippet This paper applies the adaptive gradient descent method to the second-order generalized integrator (SOGI) filter in order to find an online estimation...
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SubjectTerms Adaptive filters
Algorithms
Band-pass filters
Computer simulation
Enginyeria elèctrica
Estimators
Filtering theory
Frequency estimation
Frequency locked loops
generalized integrators
Generalized integrators (GIs)
Gradient descent estimator
Harmonic analysis
Llaços de seguiment de fase
Microprocessors
Neural networks
online grid-frequency estimation
Phase locked loops
Power harmonic filters
power quality
second-order generalized integrator (SOGI) filter
SOGI filter
Voltage distortion
Voltage sags
Àrees temàtiques de la UPC
Title A Family of Gradient Descent Grid Frequency Estimators for the SOGI Filter
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