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Lecture 3A - Power from Wind - Part 1

# Lecture 3A - Power from Wind - Part 1 - ECE 4364/5374G...

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1/28/11 1 ECE 4364/5374G-3A (c) Saifur Rahman 1 Professor Saifur Rahman Electrical & Computer Engineering Dept. Virginia Tech ECE 4364/5374G: Alternate Energy Systems Lecture 3A: Power from Wind ECE 4364/5374G-3A (c) Saifur Rahman 2 Summary of Chapter 3: Wind Resource • Wind characteristics – distributions • Temporal & spatial variations • Wind data sources • Wind power sites

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1/28/11 2 ECE 4364/5374G-3A (c) Saifur Rahman 3 Chapter 4 - Power from the Wind 4.1 Introduction The likelihood that the wind speed will remain within a certain range. How much power is contained in the wind? What fraction of that power can be extracted? Output of a wind turbine generator (WTG) varies with: Season, Time-of-day, Turbulence, Gusts, Inversion layers. Mechanical shaft power and electrical power outputs from WTGs. ECE 4364/5374G-3A (c) Saifur Rahman 4 The kinetic energy (K.E.) of any particle is: ………………. 4.1 ………………. 4.2 4.2 Power Extracted by a Wind Machine
1/28/11 3 ECE 4364/5374G-3A (c) Saifur Rahman 5 …... 4.3 Where, ρ = 1.2 kg/m 3 for air A = wind turbine blade area in m 2 v = wind speed in m/sec ECE 4364/5374G-3A (c) Saifur Rahman 6 Note that if the wind speed increases by 25% to v = 12.5m/s, the power increases to 1172 Watts, or almost doubles (95%). On the other hand, if the wind speed decreases by 25% to v = 7.5m/s, the power drops by 58% to 253 Watts. NB.

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Lecture 3A - Power from Wind - Part 1 - ECE 4364/5374G...

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