Response Subject to Varying EPS Configuration and Operating Conditions
DOI:
https://doi.org/10.24160/0013-5380-2026-2-51-62Keywords:
electric power quality, voltage harmonic distortion, voltage harmonics, resonance, power system frequency response, power system operating conditions, cosine similarityAbstract
Currently, Russia’s electric power grids of the 110 kV and higher voltage classes are equipped with electric power quality monitoring systems to a rather low extent. In view of this circumstance, frequency response analysis of an EPS is often the only way to determine the need for harmonic voltage distortion reducing measures. However, the fact that the EPS frequency properties depend on the EPS configuration and operating conditions adds significant difficulty to the above-mentioned problem in view of a wide variety of power system states to be taken into consideration. The article examines the variability of frequency response relating to the driving point impedances as seen from the 110-220 kV nodes of an area selected in the Siberian IPS with placing focus on the influence of operating and power balance conditions (power demand and the power plant generating equipment commitment). To determine the list of the representative states in terms of power system configuration and operating conditions for analyzing the EPS frequency properties, it is proposed to use the cosine similarity notion, a metric widely used for pattern recognition, which makes it possible to quantify the visual resemblance between FR curves. Its applicability is illustrated by the example of analyzing the EPS driving point impedance frequency response as seen from the 110 kV bus at one of the grid area substations under the conditions involving outages of some 110 kV dead-end power lines.
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