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Power Quality Issues in Grid Connected Wind Farms

Power Quality Issues in Grid Connected Wind Farms. by A.D.Thirumoorthy Tamil Nadu Electricity Board India. Wind Energy. Large untapped potential in India ~ 65,000 – 100,000 MW

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Power Quality Issues in Grid Connected Wind Farms

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  1. Power Quality Issues in Grid Connected Wind Farms by A.D.Thirumoorthy Tamil Nadu Electricity Board India

  2. Wind Energy • Large untapped potential in India ~ 65,000 – 100,000 MW • Technologies: Synchronous and Asynchronous Generators (with and without gears), New hybrid technologies are being introduced • Turbine unit sizes: 500 kW to 1.65 MW, may go up to 2.0 MW in near future • Leading States: Tamil Nadu – 4200 MW, Maharashtra – 1800 MW, Gujarat 1400 MW • Costs ~ Rs 6-6.5 Cr / MW subject to project size, location, technology

  3. Voltage Vs Var • Leading reactive power raises local voltage • Lagging reactive power lowers local voltage Add capacitors to counteract low voltage conditions Add reactors to counteract high voltage conditions, Turn off capacitors

  4. V&I In Wind Mill

  5. Voltage Harmonics

  6. Current Harmonics

  7. Case Study (Voltage Sag in Wind Mills) • This is a typical case of Wind Mills tripping due to Voltage Sag • Voltage Sag caused by tripping of another feeder in the same Sub Station due to earth fault • Rise in load current experienced • Suspect of induction Generator aiding the fault

  8. Sample Dip

  9. Voltage Dip in WM Feeder -49.61%

  10. Current rise in WM Feeder +268%

  11. Voltage Dip -51.4%

  12. Tripping of WM Due to Sag Loss of WM Generation -42.5%

  13. Case Study (Voltage Swell) • This a case study of Voltage Swell • Voltage swell caused in a Wind Mill connected feeder • Voltage Swell seen when Wind Mill connected feeder is isolated manually • Voltage swell due to discharge of Capacitors connected for PF correction

  14. Voltage Rise in WM During Supply Failure +11.37%

  15. Voltage Rise in Wind Mill Feeder During Supply Failure +15.37%

  16. Bipolar Transient

  17. B-Phase voltage Drop put

  18. Voltage SAG

  19. Voltage Sag

  20. Multiple Zero Crossing

  21. Phase Shift Event

  22. Sample Un-balance of Voltage

  23. Transient

  24. Transient due Tripping of Breaker due to inrush current

  25. Flicker Data in Wind Mill

  26. Sample Surge in Current

  27. Swell in Current in Wind Mill

  28. Active and Reactive Power in Wind Mill

  29. Voltage Variation in Wind Mill

  30. Frequency Profile

  31. WM Generation Vs 110 KV Bus Voltage

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