To achieve efficient and stable operation of doubly-fed induction generator (DFIG) grid-connected systems, the adaptability of oscillation suppression strategies across wide-frequency oscillation scenarios is particularly crucial. This adaptability can be scientifically characterized by robustness. This paper proposes a robustness evaluation system for oscillation suppression strategies based on the characteristics of electrical quantity response trajectories. First, wide-frequency oscillation scenarios covering multiple oscillation modes for DFIG-based wind power systems are established. Second, evaluation indicators are defined based on the characteristics of electrical quantity response trajectories, and an evaluation index system is constructed using the active power attenuation rate, steady-state amplitude suppression ratio, and dynamic adjustment time as core metrics. Third, the entropy weight method is employed to comprehensively assess the robustness level of suppression strategies. Finally, case studies under typical operating conditions are conducted to validate the effectiveness and feasibility of the proposed evaluation system. This system not only provides an indicator reference for optimizing the performance of oscillation suppression strategies within target frequency bands and enhancing their applicability across a wide frequency range but also offers a theoretical basis for designing robust suppression strategies with adaptive parameters. It holds significant reference value for improving oscillation analysis and suppression capabilities in power systems with high penetration of renewable energy.
Chen et al. (Thu,) studied this question.