Lecture 4C - WECS - Large Scale Applications - Part 2

Lecture 4C - WECS - Large Scale Applications - Part 2 -...

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1/28/11 1 ECE 4364/5374G-4C (c) Saifur Rahman 1 Professor Saifur Rahman Electrical & Computer Engineering Dept. Virginia Tech Lecture 4C: WECS – Large Scale Applications ECE 4364/5374G: Alternate Energy Systems ECE 4364/5374G-4C (c) Saifur Rahman 2 50-MW wind farm with average wind speed of 13-17 mph (class 4) Economics of Wind Farm Project size 50 MW Capital cost US$ 65 million Annual output (35% CF) 150 million kWhr Annual gross revenue US$ 6 million ($.04/kWh) Expenses Debt: 60%, Distribution 22%, O&M 8%, Land lease & taxes 5%, Management fees & insurance 5% Tax credit & depreciation 5-year depreciation on wind equipment, 1.8c/kWh tax credit Source: www.ewea.org
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1/28/11 2 ECE 4364/5374G-4C (c) Saifur Rahman 3 On-shore Cluster of WTG’s in Europe Source: www.ewea.org ECE 4364/5374G-4C (c) Saifur Rahman 4 On-shore Cluster of WTG’s in Europe Source: www.ewea.org
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1/28/11 3 ECE 4364/5374G-4C (c) Saifur Rahman 5 Figure 6.2 Change of Windspeed Profile Caused by a finite Cluster of Evenly Spaced Turbines Cluster Efect ECE 4364/5374G-4C (c) Saifur Rahman 6 The velocity reduction δ v h due to the presence of WECS (upwind) is calculated in the following way. ……………. 6.5 where V B = the wind velocity at the top of the boundary layer B. V t = turbulent component Equation (6.5) is valid when: the surface of the earth is evenly overgrown and built upon; x is smaller than B but larger than the height of trees and buildings; and the atmosphere is thermally neutral. 6.2.4 Downwind Efect in a Cluster
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1/28/11 4 ECE 4364/5374G-4C (c) Saifur Rahman 7 If we now consider small perturbation in v x due to the presence of finite number of WECS, then from equation (6.5), ……………. 6.6 Usually B 1000 m. At the hub height h, the change in the
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This note was uploaded on 03/16/2012 for the course ECE 5374G taught by Professor Srahman during the Spring '12 term at Virginia Tech.

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Lecture 4C - WECS - Large Scale Applications - Part 2 -...

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