This article analyzes the power transfer limit (Pmax) of wind power plants (WPPs) under the weak grid condition. It is pointed out that the impact of different grid parameters and grid configurations on Pmax cannot be fully reflected by the short-circuit ratio (SCR), but can be readily captured by voltage sensitivity (∂Q/∂V). Hence, ∂Q/∂V turns out to be a more appropriate metric for the assessment of Pmax compared with the SCR. Based on this insight, the voltage control of the WPP is suggested to be implemented at the bus with the highest ∂Q/∂V to maximize the power transfer capability. Moreover, a dynamic voltage control is further added at the turbine level to improve the disturbance rejection capability of the WPP as well as its dynamic robustness against grid strength variations. Finally, simulation and field test results are given to demonstrate the theoretical analysis and the effectiveness of the proposed control method.

中文翻译：

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考虑电压稳定性约束在弱电网条件下运行风力发电厂


本文分析了弱电网条件下风力发电厂（WPP）的功率传输极限（Pmax）。指出不同电网参数和电网配置对Pmax的影响不能通过短路比（SCR）完全反映，但可以通过电压灵敏度（∂Q/∂V）轻松捕获。因此，与 SCR 相比，∂Q/∂V 是评估 Pmax 更合适的指标。基于这一见解，建议在具有最高 ∂Q/∂V 的总线上实施 WPP 的电压控制，以最大化功率传输能力。此外，在涡轮级进一步增加了动态电压控制，以提高WPP的抗扰能力以及对电网强度变化的动态鲁棒性。最后，给出了仿真和现场测试结果，证明了理论分析和所提出控制方法的有效性。