unit 4 res

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ANALYSIS OF WIND AND PV SYSTEMS

4.1 Wind Energy Conversion Systems (WECS)

4.2 Classification of wind turbine rotors

4.2.1 Vertical-axis wind turbine (VAWT)

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4.2.2 Horizontal-axis wind turbines (HAWT)

ower’s role is

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4.3 Common generator types in wind turbines

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4.4 Mechanical gearbox

4.5 Control Method

4.5.1 Variable-speed turbine versus constant-speed turbine

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4.6 Fixed Speed Wind Energy Conversion Systems

“” because it was developed and widely used

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starter’s role is to smooth the inrush cu

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4.7 Variable-speed Wind Energy Conversion System

–

source converter. Thus, the term “doublyfed” comes from the fact that the stator voltage is

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4.8 Grid Connected Permanent Magnet Synchronous Generator (PMSG) Based

Wind Energy Conversion Systems.

using a transformer to voltage levels required by the utility’s AC system. The generator is

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4.8.1 Principle of Operation

δ

, power flows from the converter’s dc side

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= sin (δ)

= + ( )

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4.9 Grid Connected Squirrel Cage Induction Generator (SCIG) Based Wind Energy

Conversion Systems.

4.9.1 Fixed Speed System

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4.9.2 Variable Speed System