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Keywords

transient stability; dynamic support capability; hybrid GFL and GFM system; GFL/GFM ratioconfiguratio n method

Abstract

With the significant increase in the proportion of renewable energy, power systems exhibit characteristics of low inertia and weak damping, posing challenges to transient stability. Traditional grid-following energy storage systems (GFL-ESS) lack the capability to autonomously support the operation of power systems, necessitating the configuration of grid-forming energy storage systems (GFM-ESS) to provide voltage support and enhance system stability. To address these issues, this paper investigates the proportion of GFM-ESS units required to effectively improve the transient stability and dynamic support capabilities of the system. First, a transient model of the hybrid grid-following (GFL) and grid-forming (GFM) system is developed to analyze the mechanism by which GFM-ESS integration affects the transient synchronization stability of the hybrid system, and evaluation indicators are proposed to characterize changes in transient stability. Second, based on the time-domain target characteristics of the transient model of the hybrid system, evaluation indicators are proposed to characterize dynamic support capabilities. Using the values of transient stability and dynamic support indicators as inputs and the configuration ratio as output, a GFL/GFM ratio configuration method based on an improved grey relational analysis (GRA) -VIKOR approach is proposed. Finally, the effectiveness of the proposed configuration method is verified through a case study of an actual power system in western China.

DOI

10.19781/j.issn.1673-9140.2026.01.003

First Page

23

Last Page

35

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