Grid-forming energy storage devices (ESD) exhibit functional coupling in frequency regulation and power oscillation suppression (POS) control, with decoupling these two control functions being key to comprehensively enhancing the system’s stability support capabilities. This paper establishes a dynamic response model of a virtual synchronous generator (VSG) to analyze the coupling relationship between primary frequency regulation (PFR) parameters and damping parameters, revealing design conflicts between them. Considering the influence of VSG’s speed and damping on output power, a second-order damping differential operator is introduced to decouple the PFR and power oscillation damping functions of the VSG. An integrated control strategy for frequency regulation and POS in ESDs is proposed. Finally, a high-wind-power-penetration simulation system is built to validate the effectiveness of the proposed control strategy in enabling ESDs to provide frequency support and POS simultaneously. • An integrated control strategy for grid-forming energy storage unifies primary frequency regulation and power oscillation suppression. • The proposed method resolves the inherent contradiction between frequency regulation performance and damping parameter design. • The strategy satisfies both frequency security and oscillation suppression demands, fully excavating energy storage’s stability support capability.
Zhu et al. (Thu,) studied this question.