01-10-2010, 02:03 PM
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INTRODUCTION
Wind turbines convert the kinetic energy present in the wind into mechanical energy by means of producing torque.
Large scale wind power projects are an attractive alternative to conventional capacity expansion.
In the present scenario , most wind turbine manufacturers now equip power generating units by induction generators.
They are operated either at fixed speed or variable speed.
Generators driven by fixed speed turbines can directly be connected to grid.
Variable speed generators need a power electronic converter interface for interconnection with the grid.
Variable speed generation is preferred over fixed speed generation.
HISTORY
In 200 B.C., in ancient Persia , the earliest windmills were used to grind grain.
These early devices consisted of one or more vertically-mounted wooden beams , on the bottom of which was a grindstone, attached to a rotating shaft that turned with the wind.
Starting in the 11th century A.D. , European crusaders brought the concept and developed the DUTCH type wind mill.
Large scale wind power projects are an attractive alternative to conventional capacity expansion.
In the present scenario , most wind turbine manufacturers now equip power generating units by induction generators.
They are operated either at fixed speed or variable speed.
Generators driven by fixed speed turbines can directly be connected to grid.
Variable speed generators need a power electronic converter interface for interconnection with the grid.
Variable speed generation is preferred over fixed speed generation.
HISTORY
In 200 B.C., in ancient Persia , the earliest windmills were used to grind grain.
These early devices consisted of one or more vertically-mounted wooden beams , on the bottom of which was a grindstone, attached to a rotating shaft that turned with the wind.
Starting in the 11th century A.D. , European crusaders brought the concept and developed the DUTCH type wind mill.
