Wound Rotor Synchronous Generation (WRSG) in Wind Power Plant

This is a variable speed generator.

Main Components of Wound Rotor Synchronous Generation (WRSG) in Wind Power Plant

1. Blades and wind turbine
2. Wound rotor synchronous generator
3. Exciter
4. Rectifier (Generator side control)
5. Inverter (Grid Side control)
6. 3-ph step-up transformer
7. Output to grid system
8. D.C. link

• Rectifier-Capacitor-Inverter unit is a back-to-back power converter assembly with D.C. link.
• AC-D.C. Rectifier-is placed between stator winding and D.C. link.
• Power Inverter-towards grid.
• Stator-3-ph. Stator Y connected. Stator connects grid.
• Rotor-wound rotor winding as field winding is excited by exciter (3).
• Energy conversion-Wind energy is received by
• Blades of turbine and turbine rotor rotates
• Coupled generator rotates converting rotational (mechanical) energy into electrical energy. Voltage is stepped by 3-ph transformer and power goes to grid circuit.

Advantages of Wound Rotor Synchronous Generation (WRSG) in Wind Power Plant

1. Active-reactive power flow control is provided by the power converter unit.
2. Suitable for high power generation.
3. Real and reactive power is controlled independently.
4. Gear box is not needed.
5. Whose stator current is utilized for electromagnetic torque production, naturally efficiency is higher.
6. Power factor is better.
7. In grid fault situation, stator connections are isolated immediately.

Disadvantages of Wound Rotor Synchronous Generation (WRSG) in Wind Power Plant

1. Dynamics of mechanical balance is difficult.
2. For field winding, d.c. source is required.
3. Maintenance cost is much more.