Advanced Wind Turbine Program Next Generation Turbine ... - NREL

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3.2.4 Acoustic Noise Testing of the POC Turbine Turbine and background acoustic noise data were collected between July 6, 2000 and July 8, 2000. The A-weighted sound power level as 8 m/s wind speed was calculated using two methods for determining wind speed. The first method uses wind speed as measured on a temporary 10-m meteorological tower upwind of the turbine. The second method derives the wind speed from measurements of turbine power and a power curve obtained from power performance testing. Additional acoustic testing included wind speed sensitivity, directivity, one-third octave spectra, and tonal analysis. Figure 34 shows a comparison of the POC noise level of approximately 98 dBA to levels historically associated with wind turbines of various sizes. It is significant to note that the POC turbine exhibits noise emissions substantially below those of turbines of similar size. Figure 35 shows that this is true in spite of the POC's relatively higher rotor tip speed. 3.3 POC Certification + POC1.5/70 Figure 34. Comparison of the POC Noise Levels to Historical Levels In December 2000, Germanischer Lloyd (GL) granted GE wind certification of design compliance to IEC 61400-1 Class IIA for the production derivative of the POC turbine, the GE1.5/70.5. 59
Maxi mum Ti p Speed (m/s) Sound Power Level [dB(A)] 104 103 102 101 100 99 98 97 90 80 70 60 50 40 30 20 10 0 Enercon E- POC GE1.5s Jacobs NEG Nordex N- SudWind Vestas 66 Turbine (APX 70) MD70 Micon 60 S70 V66 1500 Enercon POC GE1.5s Jacobs NEG Nordex N- SudWind Vestas E-66 Turbine (APX 70) MD70 Mic on 60 S70 V66 1500 Figure 35. Comparison of Noise Levels and Rotor Tip Speeds 60
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National Renewable Energy Laborator
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NOTICE This report was prepared as
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Abstract This document reports the
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In addition to innovations resultin
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3.2.3 Mechanical Loads Testing of t
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List of Symbols and Abbreviations A
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The SOW also stipulates that GE see
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2.1 Electromechanical Systems Conce
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Table 1. Summary of the Key Drive T
Page 19 and 20: 2.1.1 Conventional-Speed Generators
Page 21 and 22: other than the wound rotor inductio
Page 23 and 24: offer compelling advantages to COE.
Page 25 and 26: cluded that the same would likely b
Page 27 and 28: cannot be designed for unity power
Page 29 and 30: Figure 5. Fatigue Damage Equivalent
Page 31 and 32: 2.3 Rotor and Structural Design Con
Page 33 and 34: 2.3.1.1 Upwind Rotor Blade and Towe
Page 35 and 36: Percent Change in Load Percent Chan
Page 37 and 38: the other three combinations of rot
Page 39 and 40: Percent Reduction in Component of F
Page 41 and 42: Design rules were used to estimate
Page 43 and 44: formed using the baseline rotor des
Page 45 and 46: duce an average flapwise deflection
Page 47 and 48: would be to reduce the COE by reduc
Page 49 and 50: 2.3.5 Boundary Layer Control GE com
Page 51 and 52: Perhaps the most important outcome
Page 53 and 54: Table 3. Proof of Concepts Turbine
Page 55 and 56: Figure 16. Schematic of the Proof o
Page 57 and 58: • Measure thermal characteristics
Page 59 and 60: Figure 21. POC Drive Train on the N
Page 61 and 62: • The lift and drag characteristi
Page 63 and 64: Figure 24. NGT POC Airfoil Family F
Page 65 and 66: One of the prototype blades was ini
Page 67 and 68: least 20 years of equivalent loadin
Page 69: 3.2.1 Power Performance Testing of
Page 73 and 74: Table 6. Engineering & Manufacturin
Page 75 and 76: GE briefly considered the costs and
Page 77 and 78: Figure 38. EMD 37-m (GE37a) Blade 6
Page 79 and 80: Development of the concept required
Page 81 and 82: Bench tests verified PLC control mo
Page 83 and 84: 4.3.2 Mechanical Loads Testing of t
Page 85 and 86: 5 Commercialization of GE NGT Techn
Page 87: F1146-E(12/2004) REPORT DOCUMENTATI
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