Sequences Detection of an Unbalanced Sinusoidal Voltage of Unknown Frequency Using a Reduced-Order Observer

This paper presents a globally convergent nonlinear observer capable of recovering the positive and negative sequences of an unbalanced grid voltage. The proposed algorithm has frequency adaptation, and is therefore, in steady state, immune to grid frequency variations. Another feature is that since...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2013-07, Vol.28 (3), p.1499-1507
Main Authors: Jorge, S. G., Solsona, J. A., Busada, C. A.
Format: Article
Language:English
Subjects:
Adaptive observer
Applied sciences
Convergence
Electrical engineering. Electrical power engineering
Equations
Exact sciences and technology
Frequency estimation
Observers
Proposals
reduced-order observer
sequences detection
Time-frequency analysis
Voltage measurement
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Summary:This paper presents a globally convergent nonlinear observer capable of recovering the positive and negative sequences of an unbalanced grid voltage. The proposed algorithm has frequency adaptation, and is therefore, in steady state, immune to grid frequency variations. Another feature is that since it is a reduced-order observer, only three states are needed to implement it. The validity of the proposed scheme is verified through mathematical analysis, simulation, and experimental results.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2013.2253498