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HomeMy WebLinkAboutWind Resource Assessment Rural Energy Conference JamesJensen 04-2007Wind Resource Assessment James Jensen Alaska Energy Authority Rural Energy Conference Fairbanks, Alaska April 2007 Outline •Why measure the wind? •How to measure the wind •Why measure the wind? •How to measure the wind •Analyzing the data • What’s next? Why Measure the Wind? Power = Density x Area x (Velocity)3 •Density depends on temperature & elevation •Area depends on the wind turbine (area swept by the blades) •Velocity depends on the location & height WPD (W/m^2)Speed (m/s)WPD (W/m^2)Speed (m/s)WPD (W/m^2)Speed (m/s) 1 <100 <4.4 <160 <5.1 <200 <5.6 Poor 2 100 - 150 4.4 - 5.1 160 - 240 5.1 - 5.8 200 - 300 5.6 - 6.4 Marginal 3 150 - 200 5.1 - 5.6 240 - 320 5.8 - 6.5 300 - 400 6.4 - 7.0 Fair 4 200 - 250 5.6 - 6.0 320 - 400 6.5 - 7.0 400 - 500 7.0 - 7.5 Good 5 250 - 300 6.0 - 6.4 400 - 480 7.0 - 7.4 500 - 600 7.5 - 8.0 Excellent 6 300 - 400 6.4 - 7.0 480 - 640 7.4 - 8.2 600 - 800 8.0 - 8.8 Outstanding 7 >400 >7.0 >640 >8.2 >800 >8.8 Superb Class Classes of Wind Power Density 10 m 30m 50m Rating -Different heights -Based on wind power density; not wind speed Why Measure the Wind? 0 5 10 15 20 25 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Wind SpeedFrequency (%)Ave = 6 m/s, Weibull = 1.5 Ave = 6 m/s, Weibull = 2 Ave = 6 m/s, Weibull = 3 Wind Power Density: 400 W/m2 Class 7 250 W/m2 Class 5 200 W/m2 Class 4 Wind Speed vs. Power Density Outline •Why measure the wind? •How to measure the wind •Analyzing the wind data • What’s next? Wind Map of Alaska Anemometer Loan Program Met tower kit includes: •Anemometers •Wind vane •Temperature sensor •Data logger •100-foot tower State Anemometer Loan Program AEA provides: •Tower kit •Installation assistance •Technical assistance Community provides: •Land use for 1 year of monitoring •Installation assistance •Maintenance •Data collection Location of Met Towers 25 Sites Outline •Why measure the wind? •How to measure the wind •Analyzing the wind data • What’s Next? •NRG Data Retriever Software (www.nrgsystems.com) •Excel spreadsheets •Windographer (www.mistaya.ca) •WindFarm Data Analysis Software Quality Control •Min/Max values •Metric Units •Vane offset is correct •Tower shadow •Icing of sensors Icing Event Time Series Data December 2004 Wind Frequency Distribution 0 1 2 3 4 5 6 7 8 9 10 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 Wind Speed (m/s)Percent of Time Potential Wind Power Production Toksook Bay wind turbine construction NW100 in Kotzebue NW100 power curve Photo: AVEC Wind Rose Turbulence Intensity •<0.15 Low •0.15 to 0.25 Moderate •> 0.25 High TI = SDwindspeed AVEwindspeed Outline •Why measure the wind? •How to measure the wind •Analyzing the data • What’s Next? Feasibility Studies •How many wind turbines? •What kind of wind turbines? •How much fuel would be saved? • What’s the payback? Computer Models •Available FREE at www.nrel.gov/homer •Developed by the National Renewable Energy Laboratory •RETScreen (www.retscreen.net) •Hybrid2 (www.ceere.org) Wind Energy Program Website www.akenergyauthority.org/ programwind.html