Question

Wind power generation system design;

a-) Adopt Rayleigh wind regime.

b-) Specify the power factor of the wind turbine.

c-) Find the start, stop and nominal speed of the wind turbine

d-) Calculate the annual energy production of the system

Answer 1

Wind power generation design for renewable energy:

A typical generation system will consists of a rotor, a DC current source or a AC current source.

The components are : Drive shaft, main gearbox, generator , high speed shaft , rotating blades , the rotor blades , tower support , hub and rotating bearing.

A) Rayleigh Wind Regime : Rayleigh - Betz wind machine is used to calculate the average value of annual power of a wind turbine. The machine is a ideal wind machine operating at a Betz power coefficient of 0.53.

How the average annual power is found out: cases are considered.

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1) An ideal machine with finite power and finite cut out speeds.

2) Real machine operating in a variable speed mode.

3) Real machine operating at constant speed.

B) Power factor : A power factor of 1 is desirable in controlling the electric power utilization. This factor 1 in short represents efficiency. But generally power factor 1 is difficult to reach and hence the power factor are lower than 1. 0.53 power factor was mentioned in Betz machine.

C) To start a wind turbine a speed of 2m/s is required. And the max out speed are 10- 15 m/s. To stop you will have to make the speed come 0m/s.

D) I will give you a very practical data. Suppose a 600 KW turbine is present with us.

Power generation annual - (365days* 24hrs/day* 600Kw) gives me 15*10^5 Kwh.