Subsynchronous oscillations (SSOs) induced during the generation of wind power constitute an important problem that affects the safety and the stability of power systems. It is useful to study the impact of wind turbines on the damping of the SSOs of a synchronous generator (SG). On the one hand, the relevant studies have been based mainly on eigenvalue analysis, which is insufficient, and on the other, an examination of the general mechanism of the SSO is still lacking. Based on the net electrical damping analysis method, this paper examines the dynamic interaction between the SG and doubly fed induction generator-based wind turbines (DFIGs). The self-stabilizing damping coefficient and the mutually stabilizing damping coefficient are proposed from the perspective of the SG, and the effects of different numbers and current loop control parameters of the DFIGs on torsional modes of the SG are analyzed using different grid structures. A time-domain simulation model of DFIGs connected to a power grid is built in EMTDC/PSCAD to verify the correctness of the theoretical analysis.

中文翻译：

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基于双馈电机的WTs对基于净电阻尼方法的SG次同步振荡阻尼的影响

风力发电过程中引起的次同步振荡（SSOs）是影响电力系统安全和稳定性的重要问题。研究风力涡轮机对同步发电机 (SG) 的 SSO 阻尼的影响是有用的。一方面，相关研究主要基于特征值分析，不足；另一方面，对SSO的一般机制还缺乏考察。基于净电阻尼分析方法，本文研究了 SG 和双馈感应发电机风力涡轮机 (DFIG) 之间的动态相互作用。从SG的角度提出了自稳定阻尼系数和互稳定阻尼系数，并使用不同的网格结构分析了不同数量和电流环控制参数对 SG 扭转模式的影响。在EMTDC/PSCAD中建立DFIG接入电网的时域仿真模型，验证理论分析的正确性。