Impact mechanism of frequency response on wind turbine fatigue load

Wind turbines' participation in frequency response is known to improve the stability of power systems, but it can also have a negative impact on fatigue load wind turbines. The objective this paper investigate effect loads experienced by various components turbine, including low-speed shaft, tower, and blade. To achieve goal, authors develop model variable speed horizontal-axis turbine based doubly fed induction generator. They derive explicit analytical equations shaft torque, tower bending moment, blade moment describe fluctuations torque related operating states turbines, such as generator rotor speed, pitch angle, under response. These allow for evaluation changes load. Spectral density analysis modal are used further analyze equations, examining influence different conditions turbines determining mechanism which affects qualitatively quantitatively. use FAST V8 Code NREL offshore 5-MW baseline demonstrate effectiveness proposed method evaluating affected results show that lateral side will significantly increase due