Title:
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Grid-fault control scheme for three-phase photovoltaic inverters with adjustable power quality characteristics
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Author:
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Castilla Fernández, Miguel; Miret Tomàs, Jaume; Sosa Avendaño, Jorge Luis; Matas Alcalá, José; García de Vicuña Muñoz de la Nava, José Luis
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. Departament d'Enginyeria Elèctrica; Universitat Politècnica de Catalunya. SEPIC - Sistemes Electrònics de Potència i de Control |
Abstract:
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The power quality of a three-phase photovoltaic (PV)
inverter drastically deteriorates in the presence of grid faults with
unbalanced voltages.Aripple in the injected power and an increase
in the current harmonic distortion are the main noticeable adverse
effects produced by this abnormal grid situation. Several grid-fault
control schemes are nowadays available for operating under unbalanced
grid voltage. These control schemes usually have extreme
power quality characteristics. Some of them have been conceived
to completely avoid power ripple during unbalanced voltage sags,
but at an expense of high current harmonic distortion.With other
schemes, the harmonic distortion is totally eliminated but at an
expense of high ripple in the injected power. This paper further
explores the performance of PV inverters under unbalanced voltage
sags. It has three theoretical contributions: 1) a generalized
control scheme, which includes the aforementioned grid-fault controllers
as particular cases; 2) a control strategy based on the use
of continuous values for the control parameters. This original approach
gives adjustable power quality characteristics that cannot
be achieved with the previous control schemes; 3) three different
control algorithms for calculating the continuous values of the control
parameters. These contributions are experimentally validated
with a digital signal processor-based laboratory prototype. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria electrònica::Electrònica de potència -Àrees temàtiques de la UPC::Informàtica::Automàtica i control -Digital-to-analog converters -Photovoltaic power systems -Errors de sistemes (Enginyeria) -- Prevenció -Convertidors digital/analògics |
Rights:
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Document type:
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Article - Published version Article |
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