IEEE PES Task Force on Forced Oscillations

Sponsored by IEEE PES PSDP Committee and PSSC Subcommittee

Background

Grid operators are facing various power system oscillations with the upgrades in generation and transmission and the increasing penetration of inverter-interfaced resources (IBRs). Among all types of oscillations, sustained forced oscillations have posed unique threats to reliable grid operations because, first, they have unpredictable frequencies of a wide spectrum overlapping electromechanical oscillations up to sub-synchronous oscillations, second, they are caused by an unmodeled external source such as a malfunctioning or improperly tuned controller inside the system or an unknown driving force outside of the system, and third, the sources have to be located accurately in order to take an effective mitigation action. The academia and industry have reached a consensus on the differences between forced oscillations and conventional natural oscillations in terms of their mechanisms and mitigation measures.

Scope

In past five years, many R&D activities were focused on locating the source of a forced oscillation from measurements by energy, modal analysis or machine learning based methods. Some of the methods have been successfully implemented by the industry for post-event analyses or real-time applications, and system operators have gained experience in locating and mitigating forced oscillations. This new Task Force (TF) will consolidate state-of-the-art methods, success stories, real examples, and industrial practices on locating and mitigating forced oscillations.

  • Summarizing Approaches: The TF will review and characterize available methods and tools for locating the source of a forced oscillation in power systems. IEEE and NASPI organized a worldwide Oscillation Source Location contest in 2021 and awarded three winner teams. The TF will conduct statistical analysis on submitted results and invite winners to share their success stories and approaches.
  • Documenting Industrial Practices: The TF will document the monitoring and mitigation strategies with real examples against forced oscillations by system operators.
  • Test Cases Library: The Oscillation Source Location TF (2016-2021) have developed a library of test cases (https://web.eecs.utk.edu/~kaisun/Oscillation/) included both forced and natural oscillations from real and simulated events. This new TF will inherit the library and enrich its forced oscillation cases to support academic and industrial R&D activities in this area.
  • Tasks

    No. Task Time Frame Deliverables
    Summarizing Various Approaches for Locating and Mitigating Forced Oscillations
    1 Document the approaches of the IEEE/NASPI contest winners. Jul. 2024 - Jul. 2025 Success stories of contest winners
    2 Conduct a survey to summarize and categorize available approaches for locating and mitigating forced oscillations. Jul. 2024 - Jul. 2025 Survey on methods and tools
    3 Complete a conference/journal paper on the survey. Jul. 2024 - Jul. 2025 Milestone
    Documenting Industrial Practices in Locating and Mitigating Forced Oscillations
    4 Document the criteria and studies on forced oscillations by the industry. Jul. 2025 - Jul. 2026 Documentation
    5 Document real examples and the monitoring and mitigation strategies on forced oscillations. Jul. 2025 - Jul. 2026 Documentation
    6 Complete a conference/journal paper on the industrial practices in locating and mitigating forced oscillations Jul. 2025 - Jul. 2026 Milestone
    Test Cases Library with Simulated and Real Measurements on Forced Oscillations
    7 Produce more simulated cases on forced oscillations. Jul. 2026 - Jul. 2027 New test cases
    8 Collect forced oscillation events captured by real PMUs and Digital Fault Recorders. Jul. 2026 - Jul. 2027 New test cases
    9 Submit the datasets of the library to IEEE DataPort. Jul. 2026 - Jul. 2027 Milestone

    Meetings

  • Monthly virtual meetings.
  • Annual face-to-face TF meetings at IEEE PES General Meetings.