Enhancing Power System Frequency with a Novel Load Shedding Method Including Monitoring of Synchronous Condensers’ Power Injections

Antans Sauhats, Andrejs Utans, Jurijs Silinevics, Gatis Junghans and Dmitrijs Guzs
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Antans Sauhats: Institute of Power Engineering, Riga Technical University, 12-k1 Azenes Street, LV-1010 Riga, Latvia
Andrejs Utans: Institute of Power Engineering, Riga Technical University, 12-k1 Azenes Street, LV-1010 Riga, Latvia
Jurijs Silinevics: Institute of Power Engineering, Riga Technical University, 12-k1 Azenes Street, LV-1010 Riga, Latvia
Gatis Junghans: AS Augstsprieguma Tikls (TSO), 86 Darzciema Iela, LV-1073 Riga, Latvia
Dmitrijs Guzs: Institute of Power Engineering, Riga Technical University, 12-k1 Azenes Street, LV-1010 Riga, Latvia

Energies, 2021, vol. 14, issue 5, 1-21

Abstract: 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: power grid; inertia; load shedding; frequency stability; synchronous condensers; frequency collapse; PMU (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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