Yaw motion of floating wind turbine platforms induced by pitch actuator fault in storm conditions. (April 2019)

• Record Type: Journal Article
• Authors: Uzunoglu, E.; Guedes Soares, C.
• Is Part Of: Renewable energy. Volume 134(2019)
• Page Start: 1056
• Page End: 1070
• Publication Date: 2019-04
• Subjects: Dynamic responses -- Blade pitch fault -- Floating wind platform -- Resonance -- Roll-yaw coupling; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2018.11.076
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: The paper discusses the factors affecting the large amplitude yaw responses of the DeepCwind wind turbine platform in storms with a faulty blade pitch actuator. The behaviour in operational and storm conditions without faults is provided as a base of comparison. They are followed by the responses to 50-year extreme values defined by the IEC standards, North Sea statistics, and Portugal's coastal storm data. All environmental conditions are head waves upwind sets, presumably causing minimal yaw excitation despite differing in wave excitation frequencies and maximum wind speeds. These scenarios are expanded further to cases where one of the pitch actuators stops functioning and fails to feather the blade. The result reveals large angle yaw motions of the platform. The reasoning behind this motion is explained and a possible method of mitigation through a revision of the HSS brake capacity is discussed. In this process, a frequently applied form of the hydrostatic matrix is reviewed as it includes overlooked coupling terms. Highlights: The storm condition responses of a semisubmersible platform in the presence of blade pitch actuator faults are studied. Normal operation and the pitch actuator stop functioning and failing to feather the blade are studied and compared. The result reveals a large angle yaw instability of the platform, which is explained and a possible of mitigation is discussed.