The operation of transmission systems with large share of wind power is specially challenging under storm conditions. Under the stormy wind speed conditions, wind turbine protection system is designed to shut down the turbine to avoid excessive mechanical load. The sudden loss of wind power from large offshore plants is difficult to forecast accurately, which results in a large amount of power imbalance. The severity of such a wind power imbalance towards frequency stability needs to be studied for the future power systems. In addition, the overhead transmission lines can also be affected during storms, thereby increasing their probability of failure in the operation of power system under the islanded conditions. This paper investigates how the stormy weather can threaten the frequency stability of future Danish power system with large share of wind power and how to avoid the frequency instability through proper control and defence strategies such as high-voltage direct current (HVDC) control and load shedding. Sensitivity studies are performed for ramp rates of HVDC control, load shedding strategies, inertia of the system with different volumes of disturbances to understand their impact on frequency stability.

中文翻译：

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暴风雨条件下具有较大风能份额的电力系统的频率稳定性

风能大的输电系统的运行在风暴条件下尤其具有挑战性。在暴风速条件下，风力涡轮机保护系统旨在关闭涡轮机，以避免过度的机械负载。大型海上工厂突然损失的风能很难准确预测，这会导致大量的电力失衡。对于未来的电力系统，需要研究这种风力发电对频率稳定性的不平衡的严重性。另外，架空传输线也可能在暴风雨期间受到影响，从而增加了孤岛条件下电力系统运行失败的可能性。本文研究暴风雨天气如何威胁风能份额很大的未来丹麦电力系统的频率稳定性，以及如何通过适当的控制和防御策略（例如高压直流（HVDC）控制和减载）来避免频率不稳定。对HVDC控制的斜率，减载策略，具有不同干扰量的系统惯性进行了敏感性研究，以了解其对频率稳定性的影响。