An Adaptive Prefiltering Method to Improve the Speed/Accuracy Tradeoff of Voltage Sequence Detection Methods Under Adverse Grid Conditions

This paper deals with the improvement of the transient response and harmonic, subharmonic, and dc-offset voltage rejection capability of a grid voltage sequence detection scheme based on a second-order generalized integrator (SOGI). To perform that, the SOGI structure is first analyzed in deep, emph...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2014-05, Vol.61 (5), p.2139-2151
Main Authors: Matas, Jose, Castilla, Miguel, Miret, Jaume, Garcia de Vicuna, Luis, Guzman, Ramon
Format: Article
Language:English
Subjects:
Automatització i control de l'energia elèctrica
Control de qualitat
Distribució
Distributed generation
Distributed generation of electric power
Energia elèctrica
Energies
Frequency locked loops
generalized integrators
grid offset voltage rejection
grid voltage sequence detection
Harmonic analysis
Integrators
Inverters
Power harmonic filters
Power quality
Sistemes de distribució d'energia elèctrica
subharmonic rejection
Voltage control
Voltage fluctuations
Voltage regulators
voltage sags
Àrees temàtiques de la UPC
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Summary:This paper deals with the improvement of the transient response and harmonic, subharmonic, and dc-offset voltage rejection capability of a grid voltage sequence detection scheme based on a second-order generalized integrator (SOGI). To perform that, the SOGI structure is first analyzed in deep, emphasizing both its tradeoff limits between settling time and harmonic attenuation and the sensitivity to grid subharmonics and dc-offset voltage. Then, a study of the effect of grid voltage harmonics and subharmonics in SOGI and in the SOGI-FLL and MSOGI-FLL structures is introduced. Hence, to overcome these problems, a new structure based on the use of the SOGI filter as prefilter for the previous structures is proposed to achieve a faster time response and higher harmonic rejection. This structure is used in a sequence detection scheme for the detection of the grid voltage components in the αβ-frame and it is applied in a three-phase PV system. Experimental and comparative results are shown to validate this proposal.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2013.2274414