The well-established system stability classes “Rotor Angle Stability”, “Voltage Stability” and “Frequency Stability” stand in contrast to the recently proposed classes “Resonance Stability” and “Converter-driven Stability”. The proposed classes are highly ambiguous, do not contribute to a common understanding of the phenomena in industry and academia and more importantly, they do not provide a solid basis for model simplification and stability phenomena reproduction and mitigation. This paper revisits the classification of power system stability categories and proposes an appropriate classification scheme to account for actual and future converter dominated power grids. To achieve this, the original considerations for classification are retained and two new classes “Sub-/Supersynchronous Stability” and “Harmonic stability” are established based on additional categorisation variables considering the range of possible frequency components and appropriate assumptions for model simplifications. The result is a suitable Classification of Power System Stability Phenomena offering a broad overview of power system stability and allowing suitable model simplifications for detailed studies.

For this purpose and to promote common understanding, a clear and unambiguous definition of important technical terms is introduced, including (non)-oscillatory (in)stability, damping, resonances, attenuation, amplification, passivity, harmonics, transient interactions, sub- and supersynchronous oscillations and power oscillations.

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