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An adaptive prefiltering method to improve the speed/accuracy tradeoff of voltage sequence detection methods under adverse grid conditions
Matas Alcalá, José; Castilla Fernández, Miguel; Miret Tomàs, Jaume; García de Vicuña Muñoz de la Nava, José Luis; Guzmán Solà, Ramon
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. SEPIC - Sistemes Electrònics de Potència i de Control
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.
Peer Reviewed
Àrees temàtiques de la UPC::Energies::Energia elèctrica::Automatització i control de l'energia elèctrica
Voltage regulators
Power quality
Distributed generation of electric power--Research
Integrators
Distributed generation
generalized integrators
grid offset voltage rejection
grid voltage sequence detection
power quality
subharmonic rejection
voltage sags
Energia elèctrica -- Distribució
Sistemes de distribució d'energia elèctrica -- Control de qualitat
info:eu-repo/semantics/publishedVersion
Artículo
Institute of Electrical and Electronics Engineers (IEEE)
         

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