Perturbations of weakly resonant power system electromechanical modes

Author

Dobson, Ian ; Barocio, Emilio

Author_Institution

Dept. of Electr. Comput. & Eng.,, Wisconsin Univ., Madison, WI, USA

Volume

1

fYear

2003

fDate

23-26 June 2003

Abstract

It is not uncommon for oscillatory electric power system modes to move close to a resonance in which eigenvalues coincide. In a weak resonance the modes are decoupled and the eigenvalues do not interact. We analyze general perturbations of a weak resonance and find two distinct behaviors, including interactions near strong resonances in which the eigenvalues quickly change direction. The possible perturbations are illustrated with interactions between electromechanical modes in a 4 bus power system. Some of the interactions are similar to subsynchronous resonance and can lead to oscillatory instability.

Keywords

eigenvalues and eigenfunctions; oscillations; power system dynamic stability; subsynchronous resonance; 4 bus power system; Hopf bifurcation; eigenvalues and eigenfunctions; oscillatory electric power system modes; oscillatory instability; resonant power system electromechanical modes; subsynchronous resonance; weak resonance general perturbations; Eigenvalues and eigenfunctions; Frequency; Power system analysis computing; Power system dynamics; Power system modeling; Power system security; Power system stability; Power system transients; Power systems; Resonance;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Tech Conference Proceedings, 2003 IEEE Bologna

Print_ISBN

0-7803-7967-5

Type

conf

DOI

10.1109/PTC.2003.1304130

Filename

1304130