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@PHDTHESIS{Rder:1023164,
      author       = {Röder, Julian},
      othercontributors = {Jacobs, Georg and Brecher, Christian},
      title        = {{B}ewertung von {N}etz- und {U}mrichterfehlern bei der
                      {A}uslegung von {G}etrieben für {W}indenergieanlagen},
      school       = {Rheinisch-Westfälische Technische Hochschule Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {RWTH Aachen University},
      reportid     = {RWTH-2025-10530},
      pages        = {1 Online-Ressource : Illustrationen},
      year         = {2025},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University; Dissertation, Rheinisch-Westfälische Technische
                      Hochschule Aachen, 2025},
      abstract     = {Increasing the set-up of more wind turbines is primarily
                      determined by the economic efficiency of wind turbines. One
                      negative impact factor regarding the economics of wind
                      turbines is the high cost for maintenance of the drivetrain.
                      Especially the gearbox of wind turbines is prone to damage
                      of the gear wheels and the rolling element bearings. Besides
                      the high maintenance cost, gearbox damage also leads to long
                      downtimes of the wind turbine and thus to loss of revenue.
                      Increasing the robustness of the gearbox decreases these
                      costs. A robustness increase is possible via knowing and
                      considering all loads occurring during the lifetime of the
                      wind turbine during the gearbox design phase since the
                      uncertainty in the load assumption is reduced to a minimum.
                      In the current gearbox design guidelines, grid and converter
                      faults are insufficiently considered. Grid and converter
                      faults lead to surges in the generator torque and therefore
                      represent a dynamic special load event with overload. The
                      load increase in combination with the fluctuating speed
                      results in an increased risk of damage to the gear wheels
                      and rolling element bearings of the gearbox. This work
                      therefore presents a model-based method for considering grid
                      and converter faults when designing gearboxes for wind
                      turbines. The method should be integrated into the current
                      design process, which primarily focuses the partial and
                      rated operation as well as special wind load events (e.g.
                      extreme gusts). The design regarding partial and rated
                      operation and, accordingly, the maximum power yield is
                      dominant and determines the macro geometry (e.g. number of
                      teeth) of the gearbox. The design optimization regarding
                      grid and converter faults is limited to adapting the design
                      of the microgeometry (e.g. tooth flank corrections) to
                      influence the power yield as little as possible. The first
                      step of the method of this work comprises the definition of
                      suitable models for the calculation of the risk of damage to
                      the gear wheels and rolling element bearings of the gearbox
                      due to grid and converter faults. These models are used for
                      the damage risk calculation and the derivation of
                      computationally efficient surrogate models. The design
                      optimization is performed using the surrogate models.
                      Finally, the cost-effectiveness of the design optimization
                      is evaluated. The design optimization is only economical if
                      it causes less investment than would be necessary for
                      potential maintenance.},
      cin          = {412010},
      ddc          = {620},
      cid          = {$I:(DE-82)412010_20140620$},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2025-10530},
      url          = {https://publications.rwth-aachen.de/record/1023164},
}