Explain with neat sketch working of direct drive SWT. Give any two advantages of it over geared type SWT.

Explain with neat sketch working of direct drive SWT. Give any two advantages of it over geared type SWT.
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1 Answer

Answer :

Direct Drive SWT:

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This plant has no gear box. Turbine blades are very light weight made up of stiff carbon fibre material. Blades are flat shaped. Due to this shape, lift increases. Pitch controller helps blades from high wind forces. Wind power rotates blades and hence turbine rotor rotates. Rotor rotates generator. It is permanent magnet synchronous generator. It converts mechanical power into electrical power. Diameter of rotor of generator is such that it converts much more power when turning slowly. Wind speed direction data is received from sensors and accordingly yaw drive turns nacelle to face maximum wind. With the use of pitch control, the blade angle is adjusted as per wind speed. Rectifier converts AC to DC. And DC load is fed from this DC supply. Inverter convers DC to AC and connected to grid. 


Advantages:

1. It has high power to weight ratio

2. Plant is efficient

3. Cooling needed is less

4. More reliable

5. Better performance

6. Light weight

7. Less maintenance

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