As wind power reaches a high penetration in power systems, inertia control is required in grid codes to improve the system frequency dynamics. This supplemental control will couple the mechanical system of wind turbines (WTs) with the electrical system, causing torsional vibration in drivetrains. However, the impact of inertia control on this torsional vibration can be rarely seen in literature. This article studies the mechanism of this impact and the impact rule of different parameters. A small-signal model of a DFIG-based WT with inertia control is first proposed to study the interaction between the inertia control and WT's torsional vibration. The differences between controls in DFIG-based WTs are considered in this model. Through the model, interaction paths can be obtained to help explain the impact mechanism from a general perspective. On the basis of analyzing the interaction paths, the impact rules of different parameters on the damping of torsional vibration in drivetrain are investigated in detail. Finally, time-domain simulations are performed to demonstrate the correctness of the analyses.

中文翻译：

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基于 DFIG 的 WT 惯量控制对传动系统扭转振动的影响


随着风电在电力系统中的普及，电网规范中需要惯性控制来改善系统频率动态。这种补充控制将风力涡轮机 (WT) 的机械系统与电气系统耦合起来，从而在传动系统中引起扭转振动。然而，惯性控制对这种扭转振动的影响在文献中却很少见到。本文研究了这种影响的机理以及不同参数的影响规律。首次提出了基于双馈电机的惯性控制小信号模型，以研究惯性控制与WT扭转振动之间的相互作用。该模型考虑了基于 DFIG 的 WT 中控制之间的差异。通过模型可以获得交互路径，有助于从总体角度解释影响机制。在分析相互作用路径的基础上，详细研究了不同参数对传动系统扭转振动阻尼的影响规律。最后，进行时域仿真以证明分析的正确性。