Synchronisation Control Action for Very Low-Frequency Oscillations

Connor Duggan, Paul Brogan, Xueqin Liu, Robert Best, D John Morrow

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)
108 Downloads (Pure)


Very low-frequency oscillations have been occurring on power grids with a high concentration of hydro generation and islanded grids with a lack of AC interconnection. These oscillations can persist in an ambient form or be triggered by a transient event before growing to the extent that threatens system stability. When a severe event occurs, it is important to identify the cause and have practical control actions to restore power system stability. Firstly, this paper demonstrates that synchronising a generator with a positive damping torque component can restore positively damped conditions. Simulations on a modified 2-Area system are evaluated with DIgSILENT PowerFactory. A transport delay is added to speed feedback of a GAST model governor to simulate a spontaneous negatively damped very-low-frequency oscillation with the appearance of being self-excited after a generation load imbalance. Secondly, a 300 mHz 0.08 Hz very-low-frequency oscillation on the Irish electrical grid is analysed using the governor based dissipation energy flow method. Dissipation energy flow is used to illustrate how the synchronisation of 2 generators successfully returned Ireland's power system to positively damped conditions.

Original languageEnglish
Title of host publication2021 32nd Irish Signals and Systems Conference (ISSC 2021): Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665434294
Publication statusPublished - 01 Jul 2021
Event32nd Irish Signals and Systems Conference, ISSC 2021 - Athlone, Ireland
Duration: 10 Jun 202111 Jun 2021

Publication series

NameIrish Signals and Systems Conference: Proceedings
ISSN (Print)2688-1446
ISSN (Electronic)2688-1454


Conference32nd Irish Signals and Systems Conference, ISSC 2021

Bibliographical note

Funding Information:
ACKNOWLEDGEMENTS The authors would like to thank SONI/EirGrid for providing PMU data and generator metadata. The authors would also like to thank DIgSILENT PowerFactory for granting a thesis license to continue research off-campus during COVID-19. The authors would also like to acknowledge the financial support from SPIRE 2 (Storage Platform for the Integration of Renewable Energy) project. The SPIRE 2 project is supported by the European Union’s INTERREG VA Programme (Grant No. INT-VA/049), managed by the Special EU Programmes Body (SEUPB). The views and

Publisher Copyright:
© 2021 IEEE.


  • Control Decisions
  • DEF
  • power system stability
  • Very Low-Frequency Oscillations
  • wide-area monitoring and control

ASJC Scopus subject areas

  • Signal Processing


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