Title:
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Frequency-adaptive virtual flux estimation for grid synchronization under unbalanced conditions
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Author:
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Suul, Jon Are; Luna Alloza, Álvaro; Rodríguez Cortés, Pedro; Undeland, Tore
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Other authors:
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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 new and explicitly frequencyadaptive
method for Virtual Flux estimation and voltage sensorless
grid synchronization under unbalanced conditions. The
proposed system is based on using Second Order Generalized
Integrators, arranged to simultaneously fulfill the purposes of
frequency-adaptive band-pass filtering, integration and
quadrature signal generation. This results in a simple and
efficient structure for combined Virtual Flux estimation and
separation into positive and negative sequence components. The
properties of the proposed Virtual Flux model is analyzed
theoretically, first as an integrator for implementing generic
Virtual Flux estimation, and then with respect to sequence
separation. The dynamic performance of the proposed
estimation method is tested by simulations for the case of an
unbalanced voltage drop in the grid and for a step in grid
frequency. The simulations verify the performance to be as
expected, with similar dynamics as synchronization based on
voltage measurements. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria electrònica::Electrònica de potència -Electric power systems -Electric current converters -Electrònica de potència -Convertidors de corrent elèctric |
Rights:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Document type:
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Article - Published version Conference Object |
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