Wound Rotor Induction Generator (WRIG) in Wind Power Plant

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Wound Rotor Induction Generator (WRIG) in Wind Power Plant

Block Diagram of Wound Rotor Induction Generator (WRIG)

It is also a constant speed generator.
Main Components of Wound Rotor Induction Generator (WRIG) in Wind Power Plant

  1. Blades turbine rotor unit
  2. Gear box
  3. Wound rotor induction generator
  4. Variable resistance
  5. Reactive power compensating capacitor bank
  6. 3-phase transformer
  7. To grid system tower.
  • Wind energy rotates the rotor of turbine. The gear box of wound rotor induction generator rotates and produces electrical energy. The voltage is stepped by 3 phase transformer and electrical energy is transmitted to grid by high tension 3 phase AC lines on tower supported structure.
  • For controlling the slip (or speed of generator), a 3-phase star-connected resistance unit is connected to the rotor circuit.
  • Voltage is induced in the stator winding and therefore 3-phase power directly goes to the grid circuit through step-up 3-phase transformer.
  • Fluctuations in torque and power are controlled by variable slip feature.

Advantages and Disadvantages of this type :

Advantages of Wound Rotor Induction Generator (WRIG) in Wind Power Plant :
  1. As seen in the sketch there is no need of slip-rings.
  2. Mechanical stress is reduced.
  3. Reliable system.
  4. Very simple.

Disadvantages of Wound Rotor Induction Generator (WRIG) in Wind Power Plant :

  1. It has limited speed range.
  2. Poor control of active and reactive power.
  3. Slip power dissipated as losses.
  4. Efficiency is not much.

The above two generators were constant speed type.

Now let us discuss about variable speed generators.

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