This paper proposes a fault ride through scheme for doubly-fed induction generator (DFIG)-based wind energy systems. The proposed framework combines the robustness properties of fractional order sliding mode control (FOSMC) with the active/reactive power control capability of dynamic voltage restorer (DVR) and high-power density of superconducting magnetic energy storage (SMES) devices. The FOSMC is formulated using a novel sliding manifold to control the series active filter and generate appropriate voltage for injection into the stator terminal so as to maintain the dynamic stability of the DFIG in the presence of grid faults. The DVR is used as a cost-effective solution to compensate for grid-induced voltage sags. The SMES is used as a grid-enabling device that instantaneously stores and discharges high levels of power to mitigate the sudden drop in the power resulting from the grid fault. The effectiveness of the proposed approach is demonstrated using a DFIG-based wind energy system subjected to both symmetrical and unsymmetrical faults.

中文翻译：

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基于 DFIG 的风能系统改进的故障穿越方案和控制策略


本文提出了一种基于双馈感应发电机（DFIG）的风能系统的故障穿越方案。所提出的框架结合了分数阶滑模控制（FOSMC）的鲁棒性、动态电压恢复器（DVR）的有功/无功功率控制能力以及超导磁储能（SMES）设备的高功率密度。 FOSMC 采用新型滑动歧管来控制串联有源滤波器并产生适当的电压注入定子端子，从而在电网故障时保持 DFIG 的动态稳定性。 DVR 被用作补偿电网引起的电压暂降的经济高效的解决方案。 SMES 被用作电网赋能设备，可瞬时存储和释放高水平的电力，以缓解电网故障导致的电力突然下降。使用遭受对称和不对称故障的基于 DFIG 的风能系统证明了所提出方法的有效性。