Enhancing Power System Frequency with a Novel Load Shedding Method Including Monitoring of Synchronous Condensers’ Power Injections
Energies 2021
Antans Sauļus Sauhats, Andrejs Utāns, Jurijs Siliņēvičs, Gatis Junghāns, Dmitrijs Guzs

Under-frequency load shedding (UFLS) is a classic and a commonly accepted measure used to mitigate the frequency disturbances in case of loss-of-generation incidents in AC power grids. Triggering of UFLS is classically done at frequency thresholds when system frequency collapse is already close to happening. The renewed interest for synchronous condensers due to the global trends on massive commissioning of non-synchronous renewable power generation leading to reduction of system inertia gives an opportunity to rethink the approach used to trigger load-shedding activation. This question is especially relevant for the Baltic states facing a desynchronization from Russian power grid and a necessity to operate in an isolated island mode. The main goal of this paper is to introduce a predictive load shedding (LS) method without usage of either frequency or ROCOF measurements based on the monitoring of active power injections of synchronous condensers and to prove the efficiency of the concept through several sets of case study simulations. The paper shows that the proposed approach can provide a greatly improved frequency stability of the power system. The results are analyzed and discussed, the way forward for the practical implementation of the concept is sketched.


Keywords
Frequency collapse; Frequency stability; Inertia; Load shedding; PMU; Power grid; Synchronous condensers
DOI
10.3390/en14051490
Hyperlink
https://www.mdpi.com/1996-1073/14/5/1490

Sauhats, A., Utāns, A., Siliņēvičs, J., Junghāns, G., Guzs, D. Enhancing Power System Frequency with a Novel Load Shedding Method Including Monitoring of Synchronous Condensers’ Power Injections. Energies, 2021, Vol. 14, No. 5, Article number 1490. ISSN 1996-1073. Available from: doi:10.3390/en14051490

Publication language
English (en)
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