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Conceptual Design and System Simulation

The research Group “Conceptual Design and System Simulation” at the Stuttgart Chair of Wind Energy primarily is engaged in numerical aero-servo-hydro-elastic simulation of the complete system windturbine, onshore and offshore. At the SWE the simulation codes FLEX5, SIMPACK, GH Bladed, FAST and MATLAB are used to model the dynamics of the overall system including external forces from wind and waves, as well as effects from aeroelasticity and control in different and suitable problem-specific levels of detail. The models are further developed and applied to investigate specific problems in detail, particularly regarding system loads. A special focus is on multibody simulation with accurate nonlinear modal aeroelastic blade methodologies, the simulation of aerodynamics with BEM, potential flow and CFD methods, of hydrodynamics with Morison, linear radiation/diffraction and CFD based approaches, the dynamic simulation of dynamic mooring line models, as well as the development of reduced multibody models for control purposes.

Beyond the methodology developments and system loads analysis, the simulation outcomes are utilized for conceptual design studies, e.g. the design of floating offshore platforms and innovative control systems. A validation with measurement data is also performed. The research group is closely connected to the other groups which all use aero-servo-hydro-elastic models in their respective context. Besides wind turbines, tidal turbines are also simulated with coupled multibody CFD methods.

Team
Friedemann Borisade
Ricardo Faerron Guzmán
Matthias Kretschmer
Frank Lemmer
Sarah Lott
Fiona Lüdecke
Birger Luhmann
Kolja Müller
Vasilis Pettas
Wei Yu

Downloads

 Measurement data from combined wind- and wavetunnel tests of a floating offshore wind turbine related to the INNWIND.EU project can be downloaded here.

The generic floating TripleSpar platform for the DTU 10MW wind turbine can be downloaded here.

Forschungsprojekte

OWP Control

Adaptive Operation Management and Control at Offshore Windparks based on Specific Operation Strategies for the Optimisation of Output, Loads and Grid Stability

 

Content

  • Research on different operational strategies for wind farms for the optimisation of energy yield, loads and grid stability
  • Development of an adaptive operational management for individual turbines as well as the entire wind farm
  • Enhancement of fatigue load calculation for wind turbines in a wind farm

SWE-contribution

  • Lidar measurements of the wind turbine wake in the german research wind farm alpha ventus 
  • Application of new methods for the fatigue load assessment in offshore wind farms
  • Efficient simulation of fluid-structure-interaction in wind farms

20171026_043000

Coordination

Partners

Funding

BMWi_Office_Farbe_de_WBZ

Duration

March 2017 – February 2020

Contact

Matthias Kretschmer

WINSENT (Wind Science & Engineering Test Site)

Realization and characterization of a southern German Research Platform for Wind Energy in the mountainous complex terrain

 Logo_WindForS_mitText_EN_RGB_2015_300dpi

Content

Within the framework of the project a fully functional wind energy test site in complex mountainous terrain is constructed. The test site location has already been identified within the KonTest project (Fkz. 0325656 A-D). The test site offers both a real and a virtual environment as well as testing new technologies and control strategies. The open platform supports the use of wind energy in complex terrain through improved prediction of performance and turbine load as well as through yield increase and load reduction. Besides the Coordination the project includes: Construction and Operation, Microclimate and FoWEA.

Construction and Operation includes the specification, acquisition, commissioning and maintenance of the necessary measurement equipment as well as data collection and storage. It also comprises the acquisition and construction of the research turbine inclusive of license and the necessary modifications, including the hardware-in-the-loop test stand for operational and supervisory control.
The overall objective of Microclimate is to characterize the location. To this end, measurements are carried out at the test site location, initially without the impact of the research turbines. After two thirds of the project duration the research turbines are constructed and their influence on the microclimate is investigated. Wind conditions, acoustic and avifauna are investigated with four instrumented met masts, long-range lidar devices, UAV and other sensors. The findings and data are then fed into numerical calculation models which are thus extended, enhanced and coupled.
In FoWEA the geometric and structural turbine data are processed and a new open source turbine controller is designed, tested on the HIL and implemented in the research wind turbine. Consistent numerical models of the research turbines in various simulation environments are provided and validated by comparing them with data measured at the real turbines and used for quantification of design margins.

WindForS-Testfeld - Source 2Dmedia                     [Quelle: 2Dmedia]

SWE-contribution

Construction and Operation

  • Design and test of the sensors and the measuring system
  • Creating a database structure
  • Data collection, quality assurance and plausibility checks
  • Support for data management

Microclimate

  • Evaluation of statistical quantities of the simulations and comparison with the measurements
  • Investigation of the interaction of the research wind turbine (FWEA) with the varying meteorological boundary conditions
  • Measurements of the vertical velocity and turbulence profiles for the location characterization and validation of numerical simulations
  • Flow characterization by comparison of spatially recorded wind data
  • Performance curve comparison in different meteorological conditions
  • Acoustic characterization of the site at different stages of the project

FoWEA

  • Development and implementation of a Research Baseline Controller and conception of a supervisory control strategy in MATLAB-Simulink and compilation of both for the use within different simulation tools
  • Development of test procedures for future research controllers in a hardware-in-the-loop test bed in order to represent the real behavior of the FWEA in the laboratory
  • Development of consistent numerical simulation models of the FWEA throughout different aero-elastic simulation tools ranging from reduced to high-fidelity models
  • IEC conform load case simulations with realistic inflow conditions in flat and complex terrain and comparison between simulation models
  • Comparison of measurement data from the FWEA with simulation results and improvement of models

Coordination

Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW)

Partners

Funding

BMWi_Office_Farbe_de_WBZ

Duration

December 2016 – May 2020

Contact

Martin Hofsäß

 

TremAc

Objective criteria for vibration and sound emissions of onshore wind turbines

 

Content

  • Identification of the main parameters and thresholds for an objective assessment of turbine sound and vibration emissions taking into account turbine design, topography and distance from the place of immission.
  • Development of prognosis and simulation models for the emission and propagation of airborne sound (especially infrasound) and vibration (structure-borne sound) interacting with structures, initially for flat terrain and subsequently for complex mountainous terrain and different subsoil strengths.
  • Development of strategies for optimising wind turbines through adaptable constructive designs with a view to reducing sound and vibration emissions, this applies, for example, to the positioning of the drive train or of the tower and to shielding procedures.
  • Increasing acceptance and creation of a sound data base in terms of environmental health and environmental psychology in order to promote an objective discussion of potential health risks of wind turbines.

SWE-contribution

  • Noise measurements and identification of wind turbines.
  • High-fidelity wind turbine modelling for the prediction of structure-borne sound, for example due to drive-train excitation.
  • Model validation and influence of model fidelity.

Coordination

Karlsruhe Institute of Technology (KIT) , Institute of Soil Mechanics and Rock Mechanics (IBF)

Partners

Karlsruhe Institute of Technology (KIT) Universität Stuttgart Technische Universität München (TUM) Universität Bielefeld               Martin-Luther-Universität Halle-Wittenberg (MLU) MesH Engineering GmbH (MEG)

Funding

BMWi_Office_Farbe_de_WBZ

Duration

February 2016 – January 2019

Contact

Birger Luhmann

 

LIFES50+

 Lifes50 _Logo

Content

  • Qualification of innovative floating substructures for 10MW wind turbines and water depths greater than 50m

SWE-contribution

  • Application and development of multi-fidelity tools, methods and models for the design of floating offshore wind turbines
  • Development of applicable recommended practices for the early design of floating offshore wind turbines

Coordination

Marintek

Partners

  • University of Stuttgart – SWE
  • Marintek
  • DTU
  • ORE Catapult
  • PoliMi
  • Tecnalia
  • IREC
  • Iberdrola
  • Olav Olsen
  • Ramboll
  • DNV GL
  • Ideol

Funding

European Union – H2020

Duration

July 2015 – July 2018

Contact

Kolja Müller

 

FLOATGEN

(DEMONSTRATION OF TWO FLOATING WIND TURBINE SYSTEMS
FOR POWER GENERATION IN MEDITERRANEAN DEEP WATERS)

 Floatgen_logo

Content

  • Proving the technical, economic and environmental feasibility of an EU technology floating system in deep waters
  • Bringing wind energy applications closer to market in diverse European deep offshore areas
  • Assessing the expected global generation cost per MWh in a 15-year perspective
  • Define and validate appropriate methods and processes for the construction, installation, operation and access of the floating system
  • Assess and validate its environmental impact
  • Validate performance and cost of operation and maintenance
  • Model a pathway for the reduction of energy cost from floating offshore WT system until cost values are comparable with fixed offshore wind structures and develop a roadmap
  • Ensure replicability in other deep offshore locations and transfer knowledge through benchmarking activities.

SWE-contribution

  • Aero-servo-hydro-elastic simulation and loads analysis of the floating offshore wind turbine using reduced, state-of-the-art and high-fidelity methods
  • Support in wind turbine controller design
  • Validation of simulation tools with full-scale experimental data

Coordination

IDEOL (FR)

Partners

  • IDEOL (FR): Design and engineering of the complete system (mooring, hull, umbilical) and supply of the wind turbine.
  • ÉCOLE CENTRALE DE NANTES (FR): Ocean engineering expertise and supply & monitoring of the test site (SEM-REV, located on the French Atlantic Coast) for the floating demonstrator.
  • BOUYGUES TRAVAUX PUBLICS (FR): Construction of the floating foundation.
  • RSK GROUP (UK): Analysis of the environmental impact of the floating system.
  • ZABALA (ES): Proper management and dissemination of the project.
  • FRAUNHOFER-IWES (DE): Benchmarking analysis between the proposed FLOATGEN system and other comparable floating solutions.

Funding

FP7-Logo

Duration

January 2013 – December 2017

Contact

Friedemann Borisade geb. Beyer

 

INNWIND.EU

INNOVATIVE WIND CONVERSION SYSTEMS (10-20MW) FOR OFFSHORE APPLICATIONS

Innwind_logo250

Content

  • high performance innovative design of a beyond-state-of-the-art 10-20MW offshore wind turbine and hardware demonstrators of some of the critical components.
  • a light weight rotor having a combination of adaptive characteristics from passive built-in geometrical and structural couplings and active distributed smart sensing and control
  • an innovative, low-weight, direct drive generator
  • a standard mass-produced integrated tower and substructure that simplifies and unifies turbine structural dynamic characteristics at different water depths

SWE-contribution

  • aero-servo-hydro-elastic simulation and loads analysis of the GAMESA 2MW floating offshore wind turbine
  • support in controller design
  • validation of simulation tools with full-scale experimental data

Coordination

DTU

Partners

  • DTU
  • Aalborg University
  • CRES
  • ECN
  • NTUA
  • TUD
  • Sintef
  • Polytecnico di Milano
  • University of Hannover
  • University of Oldenburg
  • University of Patras
  • University of Sheffield
  • University of Strathclyde
  • University of Stuttgart
  • WMC
  • Fraunhofer
  • Fundacion CENER-CIEMAT
  • University of Bristol
  • DHI
  • Rambøll
  • Siemens
  • GL
  • GL-GH
  • Magnomatics
  • Suzlon
  • Gamesa
  • EWEA

Funding

European Union – FP7

Duration

2012 - 2017

Contact

Frank Sandner

Abgeschlossene Forschungsprojekte

OWEA Loads  - Probabilistische Lastbeschreibung, Monitoring und Reduktion der Lasten zukünftiger Offshore-Windenergieanlagen: Kooperationsprojekt im Rahmen RAVE (Research at alpha ventus)

 Nachfolgeprojekt von OWEA (bis 2012)


Content

  • Entwicklung von genaueren Vorhersagen für Extrem- und Ermüdungslasten von  aktuellen 5MW und zukünftigen 10 MW Anlagen
  • Verifikation von Dynamik Modellen mit "state-of-the-art" Simulationstools
  • Belastungs- und Ermüdungsüberwachung für die Lebensdaueranalyse von Windenergieanlagen

SWE-contribution

  • Aero- und Hydroelastische Simulationen von zwei offshore Windenergieanlagen mit Jacket- und Tripodfundament
  • Überprüfung der Simulationsergebnisse mit Messdaten

Coordination

Universität Stuttgart      

Partners

  • Universität Stuttgart
  • ForWind Universität Oldenburg
  • REpower Systems AG
  • AREVA Wind

Funding

BMWi

Duration

2012 –2015

Contact

Ricardo Faerron Guzmán

 

Entwicklung und Test eines Systems zur Lastsenkung bei Windenergieanlagen mit 2-Blatt Rotoren (LARS LAstReduktionsSystem)


Content

  • Development of an active load reduction device LARS at the hub for a 2-bladed wind turbine
  • Development of load reduction methods
  • Simulation of load reduction methods
  • Control Development  
  • Experimental testing

SWE-contribution

  • Selection of appropriate aerodynamic models
  • Simulation of LARS, analysis and evaluation of system behavior
  • Validation with measurement data

Coordination

SkyWind GmbH

Partners

  • SkyWind GmbH, Rendsburg/Büdelsdorf
  • Deutsches Zentrum für Luft- und Raumfahrt (DLR), Braunschweig
  • Institut für Aerodynamik und Gasdynamik (IAG), Stuttgart
  • Stiftungslehrstuhl für Windenergie (SWE), Stuttgart

Funding

BMWi

Duration

01.12.2012 – 30.09.2015

Contact

Birger Luhmann

 

Tidal Hydroelasticity


Content

  • Development of a FSI environment with coupled MBS-CFD for modelling of tidal turbines
  • Analysis and optimization of components of a tidal turbine

SWE-contribution

  • Development of a FSI environment with coupled MBS-CFD for modelling of tidal turbines
  • Analysis and optimization of components of a tidal turbine

Coordination

Stiftungslehrstuhl für Windenergie (SWE), Stuttgart

Partners

  • Stiftungslehrstuhl für Windenergie (SWE)
  • VOITH Hydro

Funding

-                      

Duration

01.01.2012 – 31.12.2015

Contact

Matthias Arnold

 

OFFWINDTECH – Offshore Wind Enabling Technologies


Content

  • Integrated simulation of floating offshore wind turbines & code benchmarking
  • Identification of FOWT inflow conditions for airfoil design purposes
  • FOWT CFD simulations
  • Analysis of platform motion effects on rotor aerodynamics
  • Cost analysis for offshore grid connection

SWE-
contribution

  • Integrated aero-servo-hydro-elastic simulation methods of FOWTs
  • Analysis of CFD simulations of FOWTs (lead by IAG)
  • Analysis of floater aerodynamics and inflow conditions and of applicability of different aerodynamic simulation methods

Coordination

IREC 

Partners

  • University of Stuttgart - SWE
  • KIC InnoEnergy SE
  • Gas Natural S.D.G, S.A.,
  • Universitat Politècnica de Catalunya
  • IREC - Institut de Recerca en Energia de Catalunya
  • KTH Royal Institute of Technology
  • RePower Systems
  • Instituto Superior Técnico IST
  • KU Leuven
  • TU Eindhoven
  • Tecnalia

Funding

European Union – EIT KIC Inno Energy

Duration

2011 – 2013

Contact

Denis Matha

AFOSP - Alternative Floating Off-Shore Platforms


Content

Design and test possible floating platforms designs based on other materials that offer the potential to reduce costs

SWE-contribution

  • Uncoupled pre-design studies with reduced models and dedicated hydrodynamic boundary element codes
  • Coupled aero-hydro modelling of the platform and turbine to obtain dynamic forces on the floating platform and the vibrations and movements, to check if they are acceptable.
  • Controller design for the new design

Coordination

Gas Natural S.D.G, S.A.

Partners

  • University of Stuttgart – SWE
  • KIC InnoEnergy SE
  • Gas Natural S.D.G, S.A.,
  • Universitat Politècnica de Catalunya

Funding

European Union – EIT KIC Inno Energy

Duration

July 2012 – July 2014

Contact

Frank Lemmer