Título:
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Voltage-sensor-less synchronization to unbalanced grids by frequency-adaptive virtual flux estimation
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Autor/a:
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Suul, Jon Are; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro; Undeland, Tore
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Otros autores:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Elèctrica; Universitat Politècnica de Catalunya. SEER - Sistemes Elèctrics d'Energia Renovable |
Abstract:
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This paper proposes a simple method for inherently
frequency-adaptive virtual flux (VF) estimation intended for
voltage-sensor-less grid synchronization and control of voltage
source converters. The frequency-adaptive characteristics are obtained
by using a second-order generalized integrator configured
as a quadrature signal generator (SOGI-QSG) with the grid frequency
as an explicit input variable. It is also shown how the
properties of VF estimation based on SOGI-QSGs can be utilized
to achieve a simple and effective synchronization technique that
integrates frequency-adaptive bandpass filtering, VF estimation,
and symmetrical component sequence separation into one operation.
This new method avoids cascaded delays of VF estimation
and sequence separation and is labeled as dual SOGI-based
VF (DSOGI-VF) estimation since it is based on two parallel
SOGI-QSGs. The properties and performance of the DSOGI-VF
estimation are analyzed in comparison to conventional configurations
of VF estimation and sequence separation, demonstrating
that it is a simpler structure with improved dynamic response. In
fact, similar response time as for grid synchronization based on
voltage measurements is achieved. The operation and performance
of the proposed DSOGI-VF estimation method have been verified
by laboratory experiments in a small-scale converter setup. |
Abstract:
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Peer Reviewed |
Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria electrònica::Electrònica de potència::Convertidors de corrent elèctric -Àrees temàtiques de la UPC::Enginyeria electrònica::Electrònica de potència::Convertidors de corrent elèctric -Electric current converters -Voltage regulators -Electric power distribution -Convertidors de corrent elèctric -Reguladors elèctrics -Energia elèctrica -- Distribució |
Derechos:
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Tipo de documento:
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Artículo - Versión publicada Artículo |
Editor:
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IEEE Press. Institute of Electrical and Electronics Engineers
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