GE Infrastructure – Energy Wind Energy 101 Introduction to wind turbine technology Cy Harbourt GE Energy March 24, 2011 Virginia Mountain Section IEEE March 24 2011 Rev 4 – CD Harbourt 1 • This presentation was originally authored by Aaron Barr from GE Energy in Greenville, SC and was presented at the December meeting of the ASME in Greenville. • Thanks to Aaron for making it available to us March 24 2011 Rev 4 – CD Harbourt Agenda • Introduction – GE and Wind energy • Wind Energy first principles • Wind energy market • Wind Turbines – component view • GE Wind Energy opportunities • Q & A session March 24 2011 Rev 4 – CD Harbourt 3 Introduction 05 November 2010 162December 2010 Rev 4 Early wind energy engineer… Of all the forces of nature, I should think the wind contains the largest amount of motive power. All the power exerted by all the men, beasts, running-water, and steam, shall not equal the one hundredth part of what is exerted by the blowing of the wind. Quite possibly one of the greatest discoveries, will be the taming and harnessing of it. – Abraham Lincoln - 1860 March 17, 24 2011 2011 Rev 4 – CD Harbourt 5 “I'd put my money on the sun and solar energy. What a source of power! I hope we don't have to wait ‘til oil and coal run out before we tackle that.” ~Thomas Edison - 1931 March 17, 24 2011 2011 Rev 4 – CD Harbourt 6 Powerful Heritage… Innovative Solutions Energy Learning Center Niskayuna, NY Europe Renewables Headquarters Salzbergen, Germany Global Research Center Munich, Germany Energy Engineering Greenville, SC Global Research Center Shanghai, China Global Research Center Niskayuna, NY Global Renewables Headquarters Schenectady, NY GE Wind Manufacturing Greenville, SC Pensacola, FL Tehachapi, CA Power Conversion Center of Excellence Salem, VA JF Welch Technology Center Bangalore, India Global team with diverse expertise March 24 2011 Rev 4 – CD Harbourt 7 GE Energy….The largest renewables business on Earth Wind • Leading N. American wind turbine supplier • 6x unit growth since ‘02 • 16,000+ 1.5MW installed globally Solar • Residential, commercial and utility applications • Largest commercial solar project in Asia • PrimeStar Solar thin film technology investment Biogas • Power range: 0.25 MW-4 MW • Fuel flexibility: Natural gas or a variety of renewable or alternative gases • 10 manufacturing/assembly sites • 4,000 global employees • Installed base: 24+GW • Projects in 40+ countries •10,000 sub-supplier jobs created March 17, 24 2011 2011 Rev 4 – CD Harbourt 8 Wind Turbine Components Worsham Field GE 1.5 MW 1200-1700 Households Rotor 35 metric tons 77 meters diameter Nacelle 52 metric tons Tower 120+ metric tons 60 to 100 meters Car (for scale) March 24 2011 Rev 4 – CD Harbourt 9 Small vs. Big wind energy Utility-Scale Wind Power - 850 - 6000 kW •Owned by utilities, multi-million $ companies 1500kw •Installed on wind farms, 10 – 600 MW •Professional maintenance crews •>13 mph (6 m/s) avg wind speed Small Wind Power - 300 W - 250 kW •Individual homes, farms, businesses, etc. 10kw •On the “customer side” of the meter •Or…off the grid entirely •High reliability, low maintenance •>9 mph (4 m/s) avg wind speed Two Related technologies You Source: NREL Different applications and economics March 24 2011 Rev 4 – CD Harbourt 10 Wind Turbine Growth: Size, Power and Cost CoE From ~60 cents/kWh down to 5-6 cents/kWh for the period 1981 Rotor Dia. (m) 10 KW 25 1985 17 100 1990 27 225 1996 40 550 1999 50 750 2001 71 1,500 2005 88 2,500 2010+ 125+ 7,500+ Increased size, improved performance and technology innovation Wind energy now cost competitive with conventional fuels March 24 2011 Rev 4 – CD Harbourt 11 Wind Energy First Principles 05 November 2010 Rev 2 12 Wind Turbine Principles Converting one form of energy to another Kinetic Energy Mechanical Energy Electrical Energy Component Rotor Gearbox Generator Converter Efficiency 45-52% 95-97% 97-98% 96-99% Overall: 42 – 50% Efficient Today… Theoretical Maximum is 59.3% (no losses) March 24 2011 Rev 4 – CD Harbourt 13 Wind Turbine Energy Capture V2 Rotor power P 21 ρAV1 C p 3 where : C p rotor power coefficient V1 air density A rotor swept area Cp vs. PU Exit Velocity Ideal (Betz limit) 0.6 0.5 0.4 Cp Cp 0.593 0.7 0.3 0.2 where : 0.1 0 V2 1V 3 1 0 0.2 0.4 0.6 0.8 1 1.2 PU Exit Velocity Cp vs. PU Exit Veloc (wind velocity slows by 2/3) Source: “Wind turbines: Fundamentals, Technologies, Application and Economics”, Erich Hau, ISBN: 3540570640; (April 30, 2000) March 24 2011 Rev 4 – CD Harbourt 14 Wind Variation Unsteady dynamics •Turbulence •Shear •Density changes Design challenges •Across diameter •15% average difference •30% Instant difference Loads analysis critical to maintaining 20-year life Source: “Wind turbines: Fundamentals, Technologies, Application and Economics”, Erich Hau, ISBN: 3540570640; (April 30, 2000) March 24 2011 Rev 4 – CD Harbourt 15 Wind energy technologies Wind is…. •Really solar power! •Uneven heating of earth •Coreolis - earth rotation DRAG LIFT •Moving mass •Kinetic Energy!!! 1 Pw CP ρAV 3 2 CP Efficiency ρ air density V wind velocity A Swept Area Max CP 16/27 59.3% Source: NREL 3-blade horizontal axis turbines are optimal March 24 2011 Rev 4 – CD Harbourt 16 Wind Turbine Design Concepts Horizontal axis 3-bladed ( HAWT ) VAWT ) Horizontal axis 2-bladed Vertical axis ( March 24 2011 Rev 4 – CD Harbourt 17 Why 3 Blades? 0.6 0.5 1 Blade Cp 0.4 2 Blades Blade calculations include realistic airfoils, L/D, and tip losses. Each point along a curve represents an optimized airfoil for given tip speed ratio. Ideal curve is zero drag optimum with rotational wake. 0.3 0.2 0.1 3 Blades 4 Blades Ideal 0 0 5 10 = Tip Speed Ratio 15 = Vtip / V1 - 4 blades cost more than 3 – provide marginal performance benefit - 2 blades provides loads balancing issue - requires teetered hub/downwind rotor - 3 blades (tripod) provides to loads resolution Actualsolution Cp is constrained by Betz limit Also: noise (tip speed), loads, blade geometry March 24 2011 Rev 4 – CD Harbourt 18 U – Windspeed, m/s R – Blade radial position, m - Rotational Velocity, rad/s Varies with windspeed - Local twist angle, deg Varies with radius - Blade pitch angle, deg Varies with windspeed Wind - Angle of attack, deg Varies with radius and wind speed Trade-off Cost: Thrust loads = Material, weight Benefit: Torque Loads = Power Thrust:Torque ~ 10:1 Rotor Plane Aerodynamic Lift Drag U Thrust Torque Lift R March 24 2011 Rev 4 – CD Harbourt 19 Power Curve Terminology Power output vs. wind speed at hub height – 10min average wind speeds Example: official power curve for 1.5s 56 MPH! March 24 2011 Rev 4 – CD Harbourt 20 Wind turbines Component view 21 Nacelle & Hub components Wind Sensors ‘Top box’: low voltage, control… GE 1.5 wind turbine 52 metric ton nacelle 35 metric ton rotor High-speed coupling Mechanical brake Gearbox Generator Pitch drive 6-ft Pitch bearing Bed Frame Hub Yaw drives Yaw bearing Rotor main shaft Main bearing Hokie Bird is registered trademark of Virginia Tech March 24 2011 Rev 4 – CD Harbourt 22 Wind turbine assembly March 24 2011 Rev 4 – CD Harbourt 23 Wind turbine installation March 24 2011 Rev 4 – CD Harbourt 24 Blades – Product Differentiators Blade Cross-section Shell Shear Webs Blades critical to performance: Energy capture … revenue Aerodynamic loads… cost Trailing Edge Spar Cap Leading Edge Blade Fatigue testing Design optimization: Materials Airfoil geometry Loads Noise Efficiency Cost Logistics Source: National Renewable Energy Lab March 24 2011 Rev 4 – CD Harbourt 25 Hub & Pitch system Hub Assembly Source: GE energy – 2007 Sandia reliability conference Pitch system… critical to safety Source: GE energy – 2007 Sandia reliability conference Pitch blades out of the wind Maintain rated power Shut turbine down March 24 2011 Rev 4 – CD Harbourt 26 Gearbox and mechanical drivetrain Root cause analysis process MW-scale Gearbox Parallel stages Planetary stage Torque arms Source: GE energy – 2007 Sandia reliability conference Output – 1600RPM Drivetrain… critical to reliability Input - ~15RPM Source: GE transportation Design optimizations: Reliability… 20 year life Torque capability Maintainability Size, weight, Cost Global source-ability March 24 2011 Rev 4 – CD Harbourt 27 Wind Turbine generator types 1) Fixed Speed System – no converter INDUCTION GENERATOR 2) Doubly-Fed High speed Generator WOUND ROTOR INDUCTION GENERATOR TRANSFORMER TRANSFORMER GRID 3 GEAR BOX GEAR BOX 3 Pros: Low cost, simplicity 3 IGBT POWER CONVERTERS Cons: Poor performance Pros: Excellent compromise of cost & grid Poor grid integration C) Direct-drive generator – no gearbox 3) High speed synchronous generator SYNCHRONOUS GENERATOR SYNCHRONOUS SYNCHRONOUS GENERATOR GENERATOR TRANSFORMER GEAR BOX 3 3 Rectifier IGBT Inverter Pros: Grid integration, controllability Cons: Higher power electronics cost TRANSFORMER TRANSFORMER GRID GRID 3 GRID 3 GEAR BOX GEAR BOX 3 Rectifier 3 IGBT Rectifier Inverter GRID 3 IGBT Inverter Pros: Elimination of gearbox – reliability Cons: Large generator – high cost Generator choice is critical to operational flexibility & grid integration March 24 2011 Rev 4 – CD Harbourt 28 Tower and Power Electronics Source: GE energy – 2007 Sandia reliability conference Source; GE Energy View of 2.5MW tower base Power conversion… critical to flexibility Grid integration and compliance Variable speed capability March 24 2011 Designed & manufactured at GE in Salem, 29 Rev 4 – CD Harbourt Wind Energy Market 30 2009 31 2030 Power Required Doubles ! 32 Environmental Challenges 1875 Pasterze Glacier, Austria 2004 Increasing atmospheric CO2 is warming the planet Power generation is leading cause of CO2 emissions Carbon constraints increase demand for renewable energy March 24 2011 Rev 4 – CD Harbourt 33 US Power Generation Mix Source: Energy Information Administration Non Renewable Renewable Half the US power is coal-fired 2009 new installs : 39% wind, 9% coal March 24 2011 Rev 4 – CD Harbourt 34 Wind Resource – U.S.A. Wind Speed (m/s @ 50m) >8 7- 8 6-7 4-6 <4 (10 m/s = 22.4 mph) US percent of electricity consumption from wind: ~1% Midwestern United States is ‘Saudi Arabia of Wind’ March 24 2011 Rev 4 – CD Harbourt 35 Wind Resource - Europe Wind Speed (m/s @ 50m) >8 7- 8 6-7 4-6 <4 (10 m/s = 22.4 mph) Wind power penetration % of electricity consumption 25.0% 20.0% 15.0% 10.0% 5.0% 0.0% Denmark Spain Germany Ireland Portugal Greece Netherlands EU Source: BTM Consult ApS - September 2005 March 24 2011 Rev 4 – CD Harbourt 36 Top Wind Power countries MW % world 35,195 22% 25,853 16% 25,813 16% 18,784 12% 10,827 7% 4,845 3% 4,775 3% 4,340 3% 3,474 2% 3,408 2% 22,770 14% Source: BTM Consult [3] US and China with more than 1/3 of the World’s MW China expected to take #1 position by 2015 March 24 2011 Rev 4 – CD Harbourt 37 Top Windpower US States Top 10 producers Capacity 24.1% 26.8% 3.42% 3.5% 10.4% 3.6% 4.4% 5.0% 7.95% 5.1% 5.6% Texas Iowa California Washington Minnesota Oregon Illinois New York Production Colorado North Dakota 26 Others Source: AWEA Source: AWEA Texas, Iowa and California generate ~½ of total Dakotas could power the entire US Source: AWEA http://www.awea.org/ March 24 2011 Rev 4 – CD Harbourt 38 Wind Industry Growth - USA 2009 Installs Source: AWEA 2005: 5 turbine manufacturer active in US 2009: 10+….Competition is growing, GE remains in good position March 24 2011 Rev 4 – CD Harbourt 39 Wind Energy Grid Challenges 05 November 2010 Rev 2 40 Utility Scale Wind Generation … 5-10% Penetration Easily Managed Utility Windfarms EON - LVRT spec 100-500 MW Farms Being Developed • Grid Codes Rapidly Evolving 150 MW Trent Mesa, TX Jutland - Western Denmark 3000 MW Wind Capacity Out of 6800 MW Total • 20% of Average Demand Supplied by Wind • Max 1 Hr Penetration Is 80%, max 20% change per hour Danish Transmission Grid w/ Interconnects & Offshore Sites • HVDC Link to Norway, Hydro As Virtual Storage Managing a Variable Resource • 1 to 48 Hour Wind Forecasting Wind Site Forecasting • Coordinated Economic Dispatch of Hydro, GT, .… March 24 2011 Rev 4 – CD Harbourt Advanced Basic Performance Requirements Grid Requirements Evolution Active Anti-islanding, Torsional, others Anti-islanding O/U Voltage Overcurrent O/U Frequency Zero Power Voltage Control LVRT with controlled current injection Reserve Functions Fancy Voltage Control (WindVAR) Zero VRT – no trip (e.g. Western Australia) Frequency Response Voltage control (old DVAR) LVRT – no trip (e.g. Taiban, E-ON) Curtailment PF control None None Volt/VAR Control Protection EON - LVRT spec LVRT Active Power Control Application Characteristics Single WTGs Low Penetration Large Farms Multiple Farms High Penetration March 24 2011 Rev 4 – CD Harbourt Grid Integration …Critical for Large Scale Wind Rapidly Evolving Grid Codes • Success of wind is driving sweeping changes Voltage • New electrical control features evolving • Ride-Thru, Real/Reactive Power control • Wind needs to be as Grid-Friendly as Traditional Case) Emergency Voltage Generation forComposite 50 GW(Worst Global market 1.50 Scotland 1.40 Power 1.30 Scotland 1.20 EON Denmark 1.10 LVRT Full Power Tests Voltage (PU) 1.00 EON 0.90 France 0.80 Denmark 0.70 0.60 0.50 0.40 Global Transient Voltage Requirements EON 0.30 0.20 0.10 Australia 0.00 0.0 0.1 1.0 10.0 100.0 1000.0 10000.0 Time (seconds) March 24 2011 Rev 4 – CD Harbourt Ancillary Services & Wind Variability Unit Dispatch Operational/Cost Regime Technology Advancements 600 500 MW Slower -> 700 400 300 200 Spinning Reserve (Day Ahead Scheduling) multiday forecasting – participation in SMD 100 0 0 2000 4000 6000 8000 Hour <- Faster Time Scale 10500 Load Following (5 Minute Dispatch) Frequency & Tie-line Regulation (Seconds) Short-term forecasting and wind farm active power management 10000 9500 0 60 120 180 MAPS Load MAPS Pgen Total MAPS Base Load QSS Load QSS Pgen(i) QSS Pgen Total WTG level active and reactive power controls Voltage Power 600 seconds March 24 2011 Rev 4 – CD Harbourt Windfarm Electrics – Real & Reactive Power Control Clean volts on host utility grid Colorado Green 162Taiban MW Mesa Taiban 204 MW Plateau 204 MW ~ 1500 mi March 24 2011 Rev 4 – CD Harbourt Wind Turbine Transient Response GE Wind farms are more stable that conventional synchronous generators. Voltage recovery of the wind farm is better Synchronous Generator swings dramatically??? Time (seconds) March 24 2011 Rev 4 – CD Harbourt Wind Forecasting Eltra, Denmark - 2000 Study • 1.9GW onshore farms, 16% consumption • 3.4TWh produced, 1.3TWh miscalculated (38%) • Climatology-based forecast, inaccuracies up to 800MW • $12M imbalance payments (0.3c/kWh) AWSTruewind forecast using a combination of local statistical models, and 3D meso-scale climatology Current State-of-the-Art • Local statistical model + 3D climatology model - 10-15% mean abs error for day-ahead and 5-10% error for 6 hr ahead forecasts • 2005 regulations in Spain provide: - Penalties for >20% error on 24hr production forecast - Incentives for <10% error over rolling 4hr forecast • 2003 Cal ISO regulations – unbiased hourly, daily forecasts – settlement monthly for net deviations at average rate • Utilities need short (<6h), med (24-36h) and long term (>72h) forecasts March 24 2011 Rev 4 – CD Harbourt Wind Energy Offshore 05 November 2010 Rev 2 48 Offshore Wind … GW Scale Renewable • US East Coast, Great Lakes, BC, UK, Germany, … • Proximity to Population & Load Centers • 10-20 Km Offshore, Water Depths to 10-40 M Offshore Construction, 7.2 GW RFP’s in UK Challenges • Hurricane Exposure, Waves, Sea Bed Stability • Deep Water Foundations > 40 m Can Open Vast Resource • Tough Service Environment, Need Autonomous Operation GE 7x 3.6 MW – Arklow Banks, Irish Sea 20 GW Potential off NE Coast, Capacity Factors to 50% Offshore Wind Potential Significant Offshore Growth Potential . . . Drivers Are: • Renewable Obligations ( UK, US) • Kyoto compliance (Germany, Ireland) Over 30GW Of Specific Sites In Various Stages Have Been Announced 9.6 GW 23 GW UK Sweden 8600 600 Canada 700 200 Denmark 2700 150 400 Ireland Germany 900 USA 8300 8600 600 Belgium Active Develop Source: Emerging Energy Research / GE Wind Concept / Early Stage 750 300 300 Netherlands March 24 2011 Rev 4 – CD Harbourt Offshore Multi-Generational Plan Phase II Now Fatigue Effect ? Jacket weight increases with depth even at constant MW rating Depth dependence on weight can be reduced substantially with a floating foundation system Phase I March 24 2011 Rev 4 – CD Harbourt Floating Wind Challenges f2 > 1.785 Hz Oil & Gas Opportunity (Wide) Excitation from blade passing 0.312 < f1 < 0.383 Hz Excitation from rotor operation Compliant Floating System Current Wind Opportunity (Narrow) March 24 2011 Rev 4 – CD Harbourt DOE LWST 2 Offshore Program – 5MW+ Offshore Turbine System Design • 5-7 MW turbine rating • Design for Availability, Reliability • Access & service strategies • 5-6 c/kWh target in 20 m depth R&D Focus • Foundation technology • Turbine configuration – 2 vs. 3 blade • Drivetrain development • Rotor development to 140 m • RM&D, CBM Medium & Deep Water Foundations 2 Blade vs 3 Blade Tradeoff Service Technology, RM&D March 24 2011 Rev 4 – CD Harbourt Wind Turbines GE 1.5 MW Electrical Pitch Drives • 77 M Rotor Diameter • 50-100 M Tower • 98% Availability • Speed 10-20 RPM • Variable Pitch Doubly-Fed Generator Main Shaft & Bearing Gearbox Epoxy-Glass Composite Blades Transformer & Electrical Power Electronic Converter Wind Energy Opportunities 05 November 2010 Rev 2 55 Advanced technology development Blade Constructio n Wind Sensing Compact Drivetrains Aerodynami c optimization Advanced Generator s Wind Farm Management Advanced Load Control Power Electronics Advanced Material Development Advanced Tower Design Possibilities are endless Engineers Needed! VT Grad GE Electrical Engineer March 24 2011 Rev 4 – CD Harbourt 56 Additional Reading GE Wind Energy external http://www.gepower.com/businesses/ge_wind_energy/en/index.htm Organizations European Wind Energy Association www.ewea.org American Wind Energy Association www.awea.org Danish Wind Industry Association www.windpower.org Windpower Monthly www.wpm.co.nz AGORES Sources www.agores.org A Global Overview of Renewable Competition Overall list: http://energy.sourceguides.com/businesses/byP/wRP/lwindturbine/byN/byName.shtml Vestas, Denmark www.vestas.com Enercon www.enercon.de REpower, Germany www.repower.de/index.php?id=347&L=1 Suzlon ww.suzlon.com Siemens, Danmark http://www.powergeneration.siemens.com/products-solutionsservices/power-plant-soln/windpower/windturbines.htm Nordex www.nordex.dk Gamesa, Spain http://www.gamesa.es/index.php/en Against windpower lobby: www.windkraftgegner.de in German with links to English sites March 24 2011 Rev 4 – CD Harbourt 57 GE Energy Thank you … Questions? Cy Harbourt [email protected] March 24 2011 Rev 4 – CD Harbourt 58
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