Under-Frequency Load Shedding in Mongolia: Simulation Assessment Considering Inertia Scenarios

Choidorj Adiyabazar, Martha N. Acosta, F. Gonzalez-Longatt, J.L. Rueda , P. Palensky

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

9 Citations (Scopus)
56 Downloads (Pure)


Mongolia power system (MPS) is evolving quite fast, and the integration of renewable resources (mainly wind power and solar photovoltaic) reached 20% by 2019. The MPS is interconnected to Russia in order to cover local energy deficits, especially during freezing winters. However, the interconnection to Russia is a sensible element of the MPS, especially from the frequency control and stability point of view. This situation was evident during the sudden disconnection of the two interconnecting lines that provoked the major event of 29th June 2018, disconnecting 112 MW by the action of the Under-Frequency Load Shedding (UFLS) and making more than 1.5 million without electricity that day. This paper is dedicated to using numerical time-domain simulations to assess the existing UFLS schemes installed in the MPS. As the MPS is especially sensitive to disconnection from the Russian grid, this event is used to assess the suitability of the UFLS considering two scenarios: Summer and Winter. Results of this research paper have demonstrated that the actual UFLS scheme is not enough to avoid frequency collapse in real-life conditions during the Summer low-demand and low inertia scenario.

Original languageEnglish
Title of host publication2020 IEEE 29th International Symposium on Industrial Electronics, ISIE 2020 - Proceedings
Subtitle of host publicationProceedings
Place of PublicationPiscataway
Number of pages6
ISBN (Electronic)978-1-7281-5635-4
ISBN (Print)978-1-7281-5636-1
Publication statusPublished - 2020
Event29th IEEE International Symposium on Industrial Electronics - Delft, Netherlands
Duration: 17 Jun 202019 Jun 2020

Publication series

NameIEEE International Symposium on Industrial Electronics


Conference29th IEEE International Symposium on Industrial Electronics
Abbreviated titleISIE 2020
OtherVirtual/online event due to COVID-19
Internet address

Bibliographical note

Virtual/online event due to COVID-19
"Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public."


  • Frequency control
  • frequency stability
  • Mongolian power system
  • under frequency load shedding


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