Simulation-assisted optimisation of wind turbines

Transcription

1 Simulation-assisted optimisation of wind turbines Uwe Ritschel (Windrad Engineering GmbH) About Windrad Structural dynamics and impacts on wind turbines The virtual prototype Special topics: Tower optimization software Extreme loads with Gumbelwind More realistic wind field Observer method for condition monitoring Uwe Ritschel 3rd New Energy Forum

2 About Windrad Windrad Engineering GmbH Engineering consultant for wind industry Founded : 2002 Working fields Development of wind turbines Measurements Software Development Training More than 300 projects for manufacturers, suppliers, consultants, certifiers, project developers Uwe Ritschel 3rd New Energy Forum

3 About Windrad Uwe Ritschel 3rd New Energy Forum

4 Structural dynamics and impacts Blade flap Blade edge Nacelle tilt Drive train torsion Tower torsion Tower vibration Uwe Ritschel 3rd New Energy Forum

5 Structural dynamics and impacts Vibrations excited by Wind, turbulence Waves, ice Earthquakes Uwe Ritschel 3rd New Energy Forum

6 The virtual prototype Simulation model scheme Pitch angle Controler Inverter Torque control Wind model Induced wind Aerodynamics Mechanics Rotor Nacelle Drivetrain Tower Foundation Generator Inverter Grid Wave model Wave forces Dynamics Vibrations Sectional Forces and Moments Uwe Ritschel 3rd New Energy Forum

7 The virtual prototype GL 2010 Simulation model IEC (2005) Load cases Design loads Uwe Ritschel 3rd New Energy Forum

8 The virtual prototype Components Blades Hub Machine frame Tower Systems Pitch system Yaw system Cooling Heating Many iterations Lower loads Lower mass and costs Higher energy production Fast simulation tools by Windrad Wind field Simulation model SiWEC Tower and offshore foundation tool Extreme load evaluation Node2damage Lower cost of energy Uwe Ritschel 3rd New Energy Forum

9 The virtual prototype Requirements: Sales - Production - Purchase - Quality - HSE Turbine concept Component and System Design Simulation and Loads Virtual Prototype Component and System Analyses Results of Development Drawings - BOM - Specifications - Certification Docs Uwe Ritschel 3rd New Energy Forum

10 Special topics: Tower design software quick design of tubular steel structures (e.g. tubular tower, monopile) based on given load data (extreme, fatigue loads) optimized wall thicknesses of shells, flanges and bolt connection tunable to 1 st and 2 nd Eigenfrequency (stiff or soft tower layout) Tower: including foundation-stiffness Monopile: including structure-soil interaction Including proof against brittle and lamellar fracture, vortex induced vibrations Uwe Ritschel 3rd New Energy Forum

11 normalized tilt moment TB vhub [m/s] Special topics: Extreme loads Extreme loads often design drivers ,0 2,5 2,0 1,5 1,0 0,5 0,0-0, time [sec] Uwe Ritschel 3rd New Energy Forum

12 My extreme (normalized) Special topics: Extreme loads Extreme values from 80 time series (10 minutes) Gumbelwind statistical load 1extrapolation based on generalized Pareto distributions in accordance with IEC ed Seed Uwe Ritschel 3rd New Energy Forum

13 Special topics: Wind field Due to surface influence wind is turbulent Spatio-temporal correlations important for loading of wind turbines Together with Forwind (Prof. Peinke, Univ. Oldenburg) Uwe Ritschel 3rd New Energy Forum

14 Special topics: Wind field Probabilty of change of wind speed after time t - information on gusts Red curve given by Kaimal model, required by Standards Blue dots from athmospheric data New method to generate time series With correct statistics based on results of turbulence theory Uwe Ritschel 3rd New Energy Forum

15 Special topics: CMS by observer Wind speed Perturbations Wind Turbine Pertubation Rotor speed Measured Initial state Model of real system K Rotor speed ± Reconstructed Observation of torque in drive train Together with University of Bremen (Prof. Orlik) Uwe Ritschel 3rd New Energy Forum

16 Special topics: CMS by observer Uwe Ritschel 3rd New Energy Forum

17 Thanks for your attention! Uwe Ritschel 3rd New Energy Forum