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Design of a nonlinear power system stabilizer

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4 Author(s)
Yasser Yasaei ; Department of Electrical Engineering, Sharif University of Technology, Tehran, Iran ; Masoud Karimi-Ghartemani ; Alireza Bakhshai ; Mostafa Parniani

This paper presents a new controller for power system stabilizer (PSS) that, unlike the conventional linear controllers, consists of both a linear and a nonlinear part. The linear part is properly designed to improve the small-signal stability margin and the damping of the local electromechanical modes. The nonlinear part is then designed to improve transient stability margin of the system without violating the features offered by the linear controller. Both parts are designed based on a perspective which attributes the system oscillations to a Hopf bifurcation (HB) phenomenon. More specifically, the design of the nonlinear part is done through the definition of a nonlinear index that corresponds to the transient stability margin of the system. Simulation results on a simplified model are presented to confirm the analytical derivations.

Published in:

2010 IEEE International Symposium on Industrial Electronics

Date of Conference:

4-7 July 2010