This article analyzes the power transfer limit ( P_max ) 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 P_max 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 P_max 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的弱电网条件下运行风力发电厂

本文分析了功率传输极限（ 弱电网条件下风力发电厂 (WPPs) 的P _{max )。}指出不同格网参数和格网配置的影响P _max不能完全由短路比 (SCR) 反映，但可以很容易地通过电压灵敏度 (∂ Q /∂ 五）。因此，∂ Q /∂ V 被证明是一个更合适的衡量标准P _max与 SCR 相比。基于这一认识，WPP 的电压控制建议在 ∂ 最高的总线上实现。 Q /∂ V 以最大限度地提高功率传输能力。此外，在涡轮机级别进一步增加了动态电压控制，以提高 WPP 的抗扰能力及其对电网强度变化的动态鲁棒性。最后通过仿真和现场测试结果验证了所提控制方法的理论分析和有效性。