Transient stability enhancement of multimachine power systems using nonlinear observer-based excitation controller

•A nonlinear observer and observer-based controller for power system are proposed.•The proposed observer-based controller is designed by using partial feedback linearization.•The proposed controller enhances the stability of power systems. This paper presents an approach to design a nonlinear observ...

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Bibliographic Details
Published in:International journal of electrical power & energy systems 2014-06, Vol.58, p.57-63
Main Authors: Mahmud, M.A., Hossain, M.J., Pota, H.R.
Format: Article
Language:English
Subjects:
Applied sciences
Control systems
Control theory
Dynamical systems
Electric power generation
Electrical engineering. Electrical power engineering
Electrical machines
Electrical power engineering
Exact sciences and technology
Feedback
Miscellaneous
Multimachine power systems
Nonlinear dynamics
Nonlinearity
Observer-based excitation controller
Observers
Partial feedback linearization
Power networks and lines
Regulation and control
Transient stability controller
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Summary:•A nonlinear observer and observer-based controller for power system are proposed.•The proposed observer-based controller is designed by using partial feedback linearization.•The proposed controller enhances the stability of power systems. This paper presents an approach to design a nonlinear observer-based excitation controller for multimachine power systems to enhance the transient stability. The controller is designed based on the partial feedback linearization of a nonlinear power system model which transforms the model into a reduced-order linear one with an autonomous dynamical part. Then a linear state feedback stabilizing controller is designed for the reduced-order linear power system model using optimal control theory which enhances the stability of the entire system. The states of the feedback stabilizing controller are obtained from the nonlinear observer and the performance of this observer-based controller is independent of the operating points of power systems. The performance of the proposed observer-based controller is compared to that of an exact feedback linearizing observer-based controller and a partial feedback linearizing controller without observer under different operating conditions.
ISSN:0142-0615
1879-3517
DOI:10.1016/j.ijepes.2014.01.009