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首页> 外文期刊>Trends in Ecology & Evolution >Dynamic Stability Analysis and Improved LVRT Schemes of DFIG-Based Wind Turbines During a Symmetrical Fault in a Weak Grid
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Dynamic Stability Analysis and Improved LVRT Schemes of DFIG-Based Wind Turbines During a Symmetrical Fault in a Weak Grid

机译：弱电网对称故障期间DFIG型风力涡轮机的动态稳定性分析及改进的LVRT方案

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摘要

With the increasing penetration of the wind power, the stability issues of the weak AC grid-connected doubly fed induction generator (DFIG)-based wind turbines during low-voltage ride through (LVRT) cannot be neglected. In order to explore the instability mechanism of DFIG system during weak grid fault, the small signal state-space model is established in this paper. The results of the modal analysis show that the dominant unstable poles are mainly impacted by the phase-locked loop (PLL), rotor current control loop, and terminal voltage during the fault, where the PLL is the dominant factor. Furthermore, the impact of each factor on the system dynamic stability is comprehensively evaluated, which indicates that the controller bandwidth under normal grid condition is no longer applicable to the fault condition due to the interaction between the controller and grid. Then, the optimal current proportion which can significantly improve the system stability is deduced. Finally, based on the analysis, this paper proposes the improved LVRT control schemes from two aspects of either injecting active current or decreasing PLL bandwidth to enhance the small signal stability of the system. The effectiveness of the proposed LVRT control strategies is validated by the simulation and experiments.
机译：随着风力发电的普及，弱交流电网连接的双馈感应发生器（DFIG）的稳定性问题不能忽略低电压骑行（LVRT）期间基于低电压骑行的风力涡轮机。为了探讨DFIG系统在弱电网故障期间的不稳定机制，本文建立了小信号状态空间模型。模态分析的结果表明，主导不稳定的极点主要由锁相环（PLL），转子电流控制回路和故障期间的端子电压影响，其中PLL是主要因素。此外，综合评估了每个因素对系统动态稳定性的影响，这表明由于控制器和网格之间的交互，不再适用于正常电网条件下的控制器带宽。然后，推导出可以显着提高系统稳定性的最佳电流比例。最后，基于分析，本文提出了一种改进的LVRT控制方案，从注入有源电流或降低PLL带宽来提高系统的小信号稳定性。所提出的LVRT控制策略的有效性由模拟和实验验证。

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