Hywind. Deep offshore wind operational experience. Finn Gunnar Nielsen, Statoil RDI
The starting point -2001 Inspired by floating sailing marks. Seawind matured during 2002 Tong, K.C. OWEMES seminar, Atena, Rome,Feb. 1994 2
The Hywind concept Key features Combines known technologies Designed for harsh environment Standard offshore turbine Water depth >100 m Assembled in sheltered waters, towed to field Relies upon experience from : Floating platforms Electrical power production Onshore wind turbines 3
From idea to commercial concept 2009 2013 Onshore connected parks Onshore connected parks 2005 Pilot park Demo Market Focus 2002 2003 Model test Cost Focus Concept & theory Technical Focus Idea 4
What does it take? 2013 Onshore connected parks 2003 2002 Concept & theory 2009 Creativity Competence & experience Endurance 2005 Business understanding Professional project Demo execution Management commitment Timing Model test Funding Technical Focus Cost Focus Onshore connected parks Pilot park Market Focus Idea 5
MODEL SCALE EXPERIMENTS 2005 Demonstration of system behaviour Validation of numerical tools Model scale 1:47 Irregular waves, turbulent wind, and various control strategies 6
Assembly and installation of Hywind Demo Summer 2009 7
Operation in harsh environment Max wind velocity: 40 m/sec Max sign wave height: 10.5 m 8
Full scale measurements A total of more than 200 sensors: Waves wind and current (magnitude and direction) Motion (6 DOF) and position of floater Mooring line tension Strain gauges at tower and hull (4 levels bending moments and axial force) Rotor speed, blade pitch and generator power Flap- and edgeways rotor bending moments Motion (tower pitch) / blade pitch controllers 9
Hywind Operation and monitoring 10
Integrated Operations implementing O&G experience Integration of people process and technology Use of data, collaborative technology and multidisciplinary work Databases and data management 11
A base for testing vessels and access systems Fob Trim, Stril Merkur (MSDC12), Buddy, Fob Swath1, Bayard 3 Undertun prototype access system, MaXccess access system 12
Hywind performance in 2012 2 stops in Q1 due to external grid faults, total 57 days. Production loss of ~1,5 GWh Production 2012 is 7,4 GWh (8,9 GWh without grid error) 11% lower than normal wind speed Capacity factor 2012: 37% (would be 44% without grid error) September production 1,1 GWh, Capacity factor 54%. Focus on improvements, lower O&M cost Grid faults 13
Production during a storm condition 24 hour period during storm Dagmar, Dec 2011 Avg. wind speed 16 m/sec Max wind speed 24 m/sec Max significant wave height 7.1m Power production 96.7% of rated 14
Metocean data. Measured versus design basis Wind statistics Wind distribution from turbine. Direction is interpreted as coming from NORTH 15% 10% 5% WEST EA ST SOUTH Nacelle wind distribution Distribution from Design Basis 15
Data interpretation and validation Spectrogram of mooring line force 1 month of data shown Used for: Error detection Identification of natural frequencies. Frequency [Hz] 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 Gen. below 800 Gen. above 800 Frequency [Hz] 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 Hull_MoorForceX_Pos1_Backup - Black curve is generator speed [RPM/1e4] Poor/No data 3P 0.2 0.2 0.1 0.1 Pitch 0 0 100 200 300 Amplitude [ton 2 -s -1 ] 0 Oct/10 Time Surge 16
Full scale versus computations Wind speed 17.5 m/sec, Significant wave height 4.0m, Current 0.4 m/sec Estimated wave time history. Computed motion response Wind forces included from measured wind spectrum Visualization Tower pitch motion 17
Bending moment in tower. Mean wind: 13.2 m/s Hs: 3.2 m Tp: 9.0 s East West and North South axis 8 x 108 Bending moments about West-axis - Level 3 7 simulation measurement 7 x 108 Bending moments about North-axis - Level 3 6 simulation measurement bending moment [(knm) 2 s] 6 5 4 3 2 1 bending moment [(knm) 2 s] 5 4 3 2 1 0 0 0.1 0.2 0.3 0.4 0.5 0.6 frequency [Hz] 0 0 0.1 0.2 0.3 0.4 0.5 0.6 frequency [Hz] 18
Importance of motion controller 6 4 Conventional controller Motion stabilizing controller tower pitch angle [deg] 2 0-2 -4-6 Shut down 50 100 150 200 250 300 350 400 450 500 550 time [s] 19
Hywind evolution Use of experience - Improved design Bigger turbine Smaller hull Lower costs Site specific Hywind Demo Hywind II 20
Floating wind will compete with conventional bottom fixed solutions in a mature market 21
The next step 22
Thank You Presentation title Presenters name Presenters title E-mail address @statoil.com Tel: +4700000000 www.statoil.com 23