Estimation Of Synchronous Generator
Participation In Low-frequency Oscillations
Damping Based On Synchronized
Phasor Measurements
Author(s)
P. Y. Kovalenko, Y. P. Zakharov & A. S. Berdin
Abstract
Large-scale centralized power systems interconnected by weak tie-lines is a
typical feature of the state-of-the-industry power engineering. Another trend is
distributed generation units integration with the resulting decrease of power
system inertia constant and increasing sensitivity to small disturbances. In
particular, in the case of significant power imbalance, periodic low-frequency
oscillations of power system performance parameters may arise. Lowfrequency
oscillations in power systems are inherently non-linear and nonstationary
processes representing a superposition of numerous rotating masses
movement components having mutual influence in a power region or power
center. These situations imply the crucial role of monitoring each generator
damping capability which is determined by the adjustment of the system
regulators in use.
To estimate the synchronous generator capability to maintain synchronous
operation under deviating frequency and load angle conditions synchronizing
torque and corresponding synchronizing power are proposed to be used. The
possibility to determine the synchronous machine synchronizing power is subject
to the presence of the load angle variation data with the techniques for defining
load angle without direct measurement using a system of assumptions have been
analyzed. Numerous simulations have shown that the effect of assumptions can
be evaluated as acceptable.
The main focus of the paper is the analysis of synchronizing power
corresponding to the actual generator involved in the oscillations which had
Energy Production and Management in the 21st Century, Vol. 1 319
www.witpress.com, ISSN 1743-3541 (on-line)
WIT Transactions on Ecology and The Environment, Vol 190, © 2014 WIT Press
doi:10.2495/EQ140311
arisen after a disturbance in the Unified Energy System of Russia. The supposed
cause of the oscillations is improper automatic excitation controller operation.
Keywords: low-frequency oscillations, phasor measurements, synchronous
generator, generator load angle, synchronizing power.
Keywords
low-frequency oscillations, phasor measurements, synchronous
generator, generator load angle, synchronizing power.
Related Book
Other papers in this volume
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