Larger MW-Class Floater Designs Without Upscaling?: A Direct Optimization Approach

Leimeister, Mareike; Kolios, Athanasios; Collu, Maurizio; Thomas, Philipp

doi:10.1115/omae2019-95210

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…This 1 www.mowit.info [7]. computational model is developed by Fraunhofer IWES and primarily used for load analysis of offshore and floating [10] wind turbines as well as for automated simulation [11] and optimization [12]. Further, MoWiT has been in productive operation as a virtual rotor [13] for Hardware-in-Loop (HiL) applications in the Dynamic Nacelle Testing Laboratory (DyNaLab) [14,15] for several years now.…”

Section: Methodsmentioning

confidence: 99%

Identification of torsional frequencies of a large rotor blade based on measurement and simulation data

Wegner

Huhn

Mechler

et al. 2022

J. Phys.: Conf. Ser.

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With increasing size of wind turbines, the aerodynamic and structural properties of the rotor blades become more and more important. However, studies investigating the torsional properties using measurement data and simulation results on full-size turbines are still scarce. In this study, torsional measurements are carried out on a large wind turbine with a rotor diameter of 180 m and compared with model results. In this study, torsional measurements on a large wind turbine with a rotor diameter of 180 m are conducted and compared with model results. Torsional parameters of a rotor blade are identified using two different measurement methods, the first based on strain gauges and the second based on accelerometers. Both methods show frequencies that can be associated with the natural frequencies of the two first torsional modes of the rotor blade. To extract the natural frequencies and to reduce external effects, a manual pitching procedure is evaluated. Here, the first two natural frequencies associated with torsional modes can be identified. In a second step, the behaviour of the blade during power production is investigated and compared with the simulation results.

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Section: Methodsmentioning

confidence: 99%

Identification of torsional frequencies of a large rotor blade based on measurement and simulation data

Wegner

Huhn

Mechler

et al. 2022

J. Phys.: Conf. Ser.

Self Cite

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“…The real-time load simulation model MoWiT [9,10] couples physical models for aerodynamics, structural dynamics, hydrodynamics and control and computes them in the time domain. This computational model is developed by Fraunhofer IWES and primarily used for load analysis of (offshore floating [11]) wind turbines as well as for automated simulation [12] and optimization [13]. Further, MoWiT has been in productive operation as a virtual rotor [14] in the Dynamic Nacelle Laboratory (DyNaLab) [15] and [16] for several years now.…”

Section: Aero-elastic Wind Turbine Modelmentioning

confidence: 99%

Holistic simulation of wind turbines with fully aero-elastic and electrical model

Wiens

Frahm

Thomas

et al. 2021

Forsch Ingenieurwes

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Requirements for the design of wind turbines advance facing the challenges of a high content of renewable energy sources in the public grid. A high percentage of renewable energy weaken the grid and grid faults become more likely, which add additional loads on the wind turbine. Load calculations with aero-elastic models are standard for the design of wind turbines. Components of the electric system are usually roughly modeled in aero-elastic models and therefore the effect of detailed electrical models on the load calculations is unclear. A holistic wind turbine model is obtained, by combining an aero-elastic model and detailed electrical model into one co-simulation. The holistic model, representing a DFIG turbine is compared to a standard aero-elastic model for load calculations. It is shown that a detailed modelling of the electrical components e.g., generator, converter, and grid, have an influence on the results of load calculations. An analysis of low-voltage-ride-trough events during turbulent wind shows massive increase of loads on the drive train and effects the tower loads. Furthermore, the presented holistic model could be used to investigate different control approaches on the wind turbine dynamics and loads. This approach is applicable to the modelling of a holistic wind park to investigate interaction on the electrical level and simultaneously evaluate the loads on the wind turbine.

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“…At first and even though wind turbine foundation designs are often governed by fatigue, all DLCs defined for fatigue analyses are directly excluded, as the optimization objectives focus on global extreme system behavior without considering structural loads and integrity. From the remaining DLCs for ultimate loads, three operational design conditions are selected as design-relevant load cases with regards to the specified optimization objectives [29]:…”

Section: Design Load Casesmentioning

confidence: 99%

“…The modeling happens component-based, which brings high flexibility in modeling of any state-of-the-art onshore or offshore bottom-fixed or even floating wind turbine system. Coupling the MoWiT library to the Python-based programming environment allows automated execution of fully-coupled simulations, as well as solution of optimization problems of any kind, such as design optimization of the floating support structure, as covered in this work, or even the realization of a direct optimization approach, as presented in [29], or other optimization tasks as described in [24]. This high versatility of the modular Python-Modelica framework is even supplemented by the option of parallelized processing of simulation and/or optimization tasks.…”

Section: Introduction and Outlinementioning

confidence: 99%

Design optimization of the OC3 phase IV floating spar-buoy, based on global limit states

et al. 2020

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Floating offshore wind turbine (FOWT) systems are a fast-evolving technology, however, still have to gain economic competitiveness to allow commercial market uptake. Design optimization, focusing on cost reduction while ensuring optimum system performance, plays a key role in achieving these goals. Hence, in this work, an approach for optimizing a floating concept, utilizing global limit states, is developed. The optimization is carried out in Python, linked with Modelica and Dymola for modeling and simulation. For the FOWT design, the over-dimensioned OC3 spar-buoy is utilized. This is modified during the optimization regarding its geometrical dimensions and ballasting. The optimization criteria stability, mean and dynamic displacements, and tower top acceleration are used for formulating the objective functions. The optimization is carried out for one design load case, which is most critical for the considered criteria. Based on an initial study, NSGAII is chosen as optimizer. The convergence of the optimization is examined and the optimum design solution selected. In post-processing analyses, the overall performance of the optimized FOWT system is approved. The presented approach shows one example for the design optimization of a FOWT system and should deal as basis for more advanced design optimization tasks, including local characteristics and reliability aspects.

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Larger MW-Class Floater Designs Without Upscaling?: A Direct Optimization Approach

Cited by 8 publications

References 9 publications

Identification of torsional frequencies of a large rotor blade based on measurement and simulation data

Identification of torsional frequencies of a large rotor blade based on measurement and simulation data

Holistic simulation of wind turbines with fully aero-elastic and electrical model

Design optimization of the OC3 phase IV floating spar-buoy, based on global limit states

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