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Keywords

high-penetration renewable energy, transient rotor angle stability, dominant mode identification, deviation trajectory, transient energy function, impact assessment

Abstract

This paper addresses the new challenges in the quantitative assessment of transient rotor angle stability in high-penetration renewable energy power systems，proposing a method for evaluating the impact degree based on dominant mode identification.First，the limitations of traditional “impact degree ” assessment methods based on a single-instant kinetic energy approximation are discussed in terms of their ability to address system diversification，low inertia，and differences in the dynamic mechanisms of the two stages.It is also demonstrated that accurate generator grouping is an important prerequisite for effective assessment.On this basis，a transient energy function reflecting the relative motion between generator groups is constructed，and a theoretical connection between impact degree and transient energy is established.Subsequently，global statistical characteristics are extracted from the generators ’ relative rotor angle trajectories to accurately identify the dominant disturbance mode and reliably group the generators.Finally，on the basis of accurate grouping and by comprehensively considering the contributions of accelerating energy during the fault and decelerating energy after the fault at two key characteristic moments，a new comprehensive impact degree assessment index is constructed.Analysis results obtained from a regional power grid simulation system demonstrate that the proposed method can effectively identify the dominant oscillation mode and accurately assess the impact of different generators on the system ’s transient stability，providing a new quantitative tool for the security and stability analysis and precise control of high-penetration renewable energy power systems.

DOI

10.19781/j.issn.1673-9140.2026.04.016

First Page

197

Last Page

207

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