A Twin Circuit Theory-Based Framework for Oscillation Event Analysis in Inverter-Dominated Power Systems With Case Study for Kaua'i System

Shuan Dong, Anderson Hoke, Bin Wang, Lizhi Ding, Xiaonan Lu, Cameron Kruse, Brad Rockwell, Jin Tan

Research output: Contribution to journalArticlepeer-review

Abstract

This paper proposes a real-world oscillation event analysis framework for power systems that include inverter-based resources together with synchronous generators. Specifically, the proposed framework combines both measurement-and model-based techniques to readily identify potential oscillation sources, replay the oscillation event with numerical simulation, unveil the underlying oscillation mechanism, and suggest mitigation methods for a wide range of oscillation events. To strengthen the theoretical foundation of our analysis framework, this paper proposes a twin circuit theory that provides theoretical support for one key utilized but not well-proven measurement-based oscillation source identification method-Dissipating Energy Flow. Our twin circuit theory also shows that adopting well-tuned grid-forming inverters can be a potential mitigation method for oscillation events. Finally, the effectiveness of our proposed oscillation event analysis framework is demonstrated by addressing a real-world 18-20 Hz oscillation event in Kaua‘i's power system on November 21, 2021.

NREL Publication Number

  • NREL/JA-5D00-84390

Keywords

  • dissipating energy flow
  • grid-following inverter
  • grid-forming inverter
  • oscillation event analysis

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