Small signal stability assessment of the Eskom network based on measurements
Date
2015-05-05
Authors
Mvuyana, Steven Siphesihle
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Abstract
Low frequency oscillations between the ranges of 0.1Hz and 3.0Hz are inherent in power
systems. These low frequency oscillations are directly related to the small signal stability
of the power system and its ability to function as designed under their constant
presence within the power system. This dissertation presents an investigation into the
small signal stability performance of the Eskom network with the aim of improving
the damping performance of a known inter-area network oscillation mode between the
(South-) Western Cape and the North-Eastern Mpumalanga regions. The most cost
effective method of damping out these low frequency oscillations is through the use of
power system stabilizers. The damping performance of the inter-area oscillation mode
of concern was achieved through re-designing the power system stabilizer parameters for
stabilizers currently installed within the Eskom network. The designed power system
stabilizers were then tested under various network contingencies to ensure that their
performance was optimal over a wide range of system conditions.