TY - JOUR A1 - Schulz, Carsten A1 - Schwarz, Colin T1 - Drivetrain fatigue strength characteristics of model-predictive control for wind turbines JF - Wind Energy N2 - Wind turbines play a crucial role in the revolution towards renewable resources. They need to be economically competitive to be sustainable. This still requires to lower the cost of energy (COE). To this end, nonlinear model predictive control (NMPC) is used within this paper. As known from literature, NMPC significantly improves the energy extracting performance as well as the mitigation of tower loads of wind turbines. As it is shown in this paper, the drivetrain fatigue strength drops disproportionally in parallel, which either increases the demands on the turbine design or decreases the lifetime of drivetrain components. Without additional boundary conditions to the underlying optimal control problems (OCPs), the application of energy-maximizing NMPC might so even raise the COE. Only penalizing axial torque oscillations by quadratic terms decreases energy-extracting performance below the level of classical wind turbine controllers. This makes more sophisticated conditions necessary. In this paper, the increase of the drivetrain damage by NMPC is analyzed, and appropriate boundary conditions are derived, to balance the two contradicting objectives of energy maximization and drivetrain load mitigation. An NMPC approach based on indirect methods is used, to obtain a solution of the OCPs very efficiently. It applies the Hamilton equations and Pontryagin's maximum principle. Its accuracy and efficiency to solve OCPs was presented over the last decades. Y1 - 2020 U6 - https://doi.org/10.1002/we.2520 VL - 23 IS - 12 SP - 2137 EP - 2149 PB - Wiley ER - TY - CHAP A1 - Schulz, Carsten A1 - Schwarz, Colin T1 - Indirect Model Predictive Control and its Impact on the Fatigue Strength of the Drivetrain T2 - 10. VDI-Fachtagung Schwingungen von Windenergieanlagen 2019 : Bremen, 04.-05. Juni 2019 Y1 - 2019 SN - 978-3-18-092346-8 ER - TY - CHAP A1 - Schwarz, Colin A1 - Schulz, Carsten ED - Schlecht, Berthold T1 - Indirekte nichtlineare Modellprädiktive Regelung von Windkraftanlagen und deren Einfluss auf die Betriebsfestigkeit beteiligter Maschinenelemente T2 - DMK - Dresdner Maschinenelemente Kolloquium, 2017, Dresden Y1 - 2017 PB - sierke-Verlag ER - TY - CHAP A1 - Schwarz, Colin A1 - Schulz, Carsten T1 - Moderne, schädigungsreduzierende Ansätze zur Regelung einer Windenergieanlage in einem breiten Lastspektrum T2 - Dresdner Maschinenelemente Kolloquium : DMK 2019 : 26.-27. Nov. Y1 - 2019 SN - 978-3-96548-055-1 SP - 601 EP - 616 PB - Sierke Verlag CY - Göttingen ER -