Frequency-locked and quasiperiodic (QP) oscillations in power systems

Author

Chakravarthy, S.K. ; Nayar, C.V.

Author_Institution

Sch. of Electr. & Comput. Eng., Curtin Univ. of Technol., Perth, WA, Australia

Volume

13

Issue

2

fYear

1998

fDate

4/1/1998 12:00:00 AM

Firstpage

560

Lastpage

569

Abstract

It is known that quasiperiodic (QP) oscillations can occur when an unloaded power transformer at the end of a long power line is energised. This occurs when the effect of the core loss of the transformer “becomes negligible” due to the stiff nonlinear characteristic of the core. Usually, such a system is known to exhibit periodic or frequency-locked behaviour. Such a system is an equivalent form of “two nonlinearly coupled oscillators” and the transition from frequency-locked to quasiperiodic behaviour and vice versa depends on the strength of nonlinear coupling between the oscillators. This aspect is examined in this paper

Keywords

circuit oscillations; power system stability; power system transients; power transformers; power transmission lines; transformer cores; core loss; frequency-locked oscillations; long power lines; nonlinear coupling strength; nonlinearly coupled oscillators; power systems; power transformer energisation; quasiperiodic oscillations; stiff nonlinear characteristic; Core loss; Couplings; Frequency; Magnetic flux; Oscillators; Power systems; Power transformers; Quadratic programming; Resonance; Surges;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.660929

Filename

660929