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

Author

Jorge, S.G. ; Solsona, Jorge A. ; Busada, C.A.

Author_Institution

Dept. de Ing. Electr. y de Computadoras, Univ. Nac. del Sur (UNS), Bahia Blanca, Argentina

Volume

28

Issue

3

fYear

2013

fDate

Jul-13

Firstpage

1499

Lastpage

1507

Abstract

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.

Keywords

frequency control; mathematical analysis; observers; power grids; power system control; reduced order systems; sequences; voltage control; frequency adaptation; globally convergent nonlinear observer; grid frequency variations; mathematical analysis; negative sequence detection; positive sequence detection; reduced-order observer; unbalanced grid voltage; unbalanced sinusoidal voltage; unknown frequency; Convergence; Equations; Frequency estimation; Observers; Proposals; Time-frequency analysis; Voltage measurement; Adaptive observer; frequency estimation; reduced-order observer; sequences detection;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/TPWRD.2013.2253498

Filename

6495520