Signatures and Mechanism Analysis of Converter-Grid Subsynchronous Oscillations

Alisher Askarov (), Yuly Bay, Ruslan Ufa, Pavel Radko, Pavel Ilyushin and Aleksey Suvorov
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Alisher Askarov: School of Energy & Power Engineering, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia
Yuly Bay: School of Energy & Power Engineering, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia
Ruslan Ufa: School of Energy & Power Engineering, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia
Pavel Radko: School of Energy & Power Engineering, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia
Pavel Ilyushin: Department of Research on the Relationship between Energy and the Economy, Energy Research Institute of the Russian Academy of Sciences, 117186 Moscow, Russia
Aleksey Suvorov: School of Energy & Power Engineering, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia

Mathematics, 2024, vol. 12, issue 24, 1-28

Abstract: In the last decade, a rather new phenomenon related to subsynchronous oscillations (SSO) in a wide frequency range has emerged in modern power grids with power converters. The consequences of these oscillations can be severe system accidents, which have already occurred in various power systems. Taking into account the importance of studying such oscillations for effective mitigation and the existing gaps in understanding the mechanisms of SSO occurrence due to different combinations of used controllers in the inverter control system, as well as the grid parameters, a frequency analysis of simplified grid inverter models is performed. As a result, five different mechanisms of SSO occurrence, the affecting factors and the level of inverter model detail required for the adequate study of SSO are justified. The developed detailed state–space model allowed for verifying the obtained results, as well as identifying an additional sixth mechanism of SSO occurrence. The common condition for the occurrence of all the identified SSO mechanisms is a weak grid with a short-circuit ratio of less than two. The results of control hardware-in-the-loop testing confirmed the conclusions drawn. As a result, a classification of SSO occurrence mechanisms was formed, reflecting their causes and distinctive features.

Keywords: inverter-based resources; subsynchronous oscillation; stability; weak grid; classification of SSO (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2024
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