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Probing signal design for enhanced damping estimation in power networks

Abstract : Electromechanical oscillations are inherent to power networks. Although it is possible to partially damp these oscillations, it is impossible to eliminate them completely. This oscillatory behavior can lead to major breakdowns in power networks, especially when the damping is relatively low. It is therefore important to provide accurate estimations of the network’s damping values. These estimation can be obtained via system identification for which a probing signal needs to be designed. This paper presents a framework for designing a specific probing signal that is able to provide accurate damping estimations with a user-defined variance. A power spectrum of the probing signal is determined by solving an optimization problem with Linear Matrix Inequality constraints. The objective function is defined as a weighted sum of the probing signal’s power and a level of disturbance caused by probing the network. A desired level of the damping estimation’s variance is set as a constraint. The time-domain realization of the obtained power spectrum is described by a multisine, which is the actual probing signal applied to the network. The employed framework is demonstrated through nonlinear simulations using the Kundur with an embedded HVDC link and NORDIC 44 networks.
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https://hal.archives-ouvertes.fr/hal-03141205
Contributor : Xavier Bombois <>
Submitted on : Monday, February 15, 2021 - 10:23:39 AM
Last modification on : Monday, February 22, 2021 - 2:34:32 PM

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Sjoerd Boersma, Xavier Bombois, Luigi Vanfretti, Juan-Carlos Gonzalez-Torres, Abdelkrim Benchaib. Probing signal design for enhanced damping estimation in power networks. International Journal of Electrical Power & Energy Systems, 2021, 129, pp.106640. ⟨10.1016/j.ijepes.2020.106640⟩. ⟨hal-03141205⟩

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