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ACCIONA WINDPOWER WIND POWER PLANTS AND GRID INTEGRATION EXPERIENCE

ACCIONA WINDPOWER WIND POWER PLANTS AND GRID INTEGRATION EXPERIENCE. 2010 –Friday 23 th April. Óscar Alonso Teresa Arlabán Alberto García Alejandro González. Authors statement.

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ACCIONA WINDPOWER WIND POWER PLANTS AND GRID INTEGRATION EXPERIENCE

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  1. ACCIONA WINDPOWER WIND POWER PLANTS AND GRID INTEGRATION EXPERIENCE 2010 –Friday 23th April Óscar Alonso Teresa Arlabán Alberto García Alejandro González

  2. Authors statement As a consequence of the Island volcano ash any author of the present paper has been attending the 2010 EWEC conference in Warsaw. Our commitment with the attendees and conference organizers has lead us to prepare a new presentation with audio tracks where you will hear the voices of Oscar Alonso and Teresa Arlaban introducing and highlighting the most important aspects of our work. We apologize for any inconvenience and hope you find our work interesting and useful. At the end of the presentation you will see our contact email. Feel free to contact us for any question or doubt. Our Best Regards. Teresa Alberto Alejandro Óscar

  3. Introduction • TSO – DSO Grid Requirements: • Voltage support: Normal and Transients. • International approach. • Compliance of: turbines and subs controls • AW turbine capabilities (AW1500/3000) • Reactive power & LV/HV RT capabilities • Substation level voltage control. • Last experience: Waubra - Australia. • Future trends: Preliminary research results.

  4. 1 GRID SUPPORT REQUIREMENTS 1 .- Scope of the current operator demands • Every country establishes distinct specs. • Different requirements for transmission or distribution lines. • Current demands mainly focused on following aspects: • Normal operation – small voltage variations. • Transients: LVRT and HVRT. • Quality: Flicker, harmonics, unbalance, etc • Protections. • Metering .

  5. 1 GRID SUPPORT REQUIREMENTS 2 .- Voltage Controls • Normal demands: • 5% voltage steps response in 1 to 5 s. • Reactive power range: +/- 35% Rated Power. • Operation on voltage range (PCC): +/- 15%. • Set point accuracy higher than 0.5 %.

  6. 1 GRID SUPPORT REQUIREMENTS 3.- LVRT – International Comparison – Balance/unbalance AWP technology

  7. 1 GRID SUPPORT REQUIREMENTS 4.- Implications • Turbine level: • Increased reactive power range (40%). • Efficient reactive power management. • Improved LVRT/HVRT techniques. • Substation Level: • Improved technology (control & comms).

  8. 2 ACCIONA WINDPOWER TURBINES: AW1500 / 3000 1 .- General Characteristics • Variable Speed – Low loads • Rated Power: 1500 / 3000 kW • IGBT-Based Power converter. • Doubly Fed Induction generator: • 6 pole – 1000 rpm. • 50 / 60 Hz • Pitch Control – Hydraulic • Three-bladed. Horizontal Shaft. • High Efficiency: 12 kV supply.

  9. 2 ACCIONA WINDPOWER TURBINES: AW1500 / 3000 Design - Robust – Reliable - Efficient AW1500 AW3000

  10. 2 ACCIONA WINDPOWER TURBINES: AW1500 / 3000 2.- Extended Reactive Power Range: 40% AW1500 AW3000 Increased Reactive Power capability implies: Increased power converter & generator ratings

  11. 2 ACCIONA WINDPOWER TURBINES: AW1500 / 3000 3 .- LVRT / HVRT New Torque and Pitch strategy • Based on “available active power” (depends on the remaining voltage and reactive current injection) • Available torque is used to damp oscillations. • Fast Pitching to get pre-calculated steady angle.

  12. 2 ACCIONA WINDPOWER TURBINES: AW1500 / 3000 • Example (LVRT test) • - 90% Volt depth and 2s long. • Turbine load 90%. Max = 1272.12 rpm Max = 1246.5 rpm 88 rpm 38 rpm

  13. 2 ACCIONA WINDPOWER TURBINES: AW1500 / 3000 3 .- LVRT / HVRT New Torque and Pitch strategy • Consequences • Longer and deeper voltage dips. • Reduction of oscillations and mechanical loads. Old Techniques New Techniques

  14. 3 VOLTAGE CONTROL – WAUBRA (AUS) 1 .- WAUBRA (AUS) Characteristics & Requirements • 128 wind turbines model AW1500. • POI at 220 kV – 2 transformers 220 kV / 66 kV / 150 MW • Five substations 66 kV / 12 kV. • Two voltage controllers: • Transformer 1. 66 kV side. • Transformer 2. 66 kV side. • Requirements: • Response for voltage steps of 5% in less than 5 secs. • Reactive capacity +/- 30% Rated Power.

  15. 3 VOLTAGE CONTROL – WAUBRA (AUS) 2 .- Voltage Control Principles Comms: 200 ms polling cycle Parameters: Kp Ti Filter

  16. 3 VOLTAGE CONTROL – WAUBRA (AUS) 3 .- Set point step tests Set Point steps Saturation Pink – Substation Reactive power Blue – Substation Voltage

  17. 3 VOLTAGE CONTROL – WAUBRA (AUS) 4.- Transformer Tap changer tests Transformer Tap changer test 2 - 3 s max response time Pink – Substation Reactive power Blue – Substation Voltage

  18. 3 VOLTAGE CONTROL – WAUBRA (AUS) 5 .- Coordination after LV or HV faults (Now, standard) Turb Control Sub Control Sub Control Smoothed reactive power restoration Ramp up/down 30 to 50 kVAr/s LV event – 0.5 s (real measurement)

  19. 4 FUTURE DEVELOPMENTS 1 .- Improved Voltage control • Same control for weak (SCR<2) or strong grids (SCR>10). • Detection of the grid characteristics: • Fast grid impedance selection method. • Fast estimation algorithm of the Thevenin grid voltage. • Principle of operation: Steady-state pre-calculated response. • Accurate, robust and safe even with long polling times. • Patents pending.

  20. 4 FUTURE DEVELOPMENTS 1 .- Improved Voltage control (1 – 2 s response) RX grid change (SCR 20 to less than 4!) Grid voltage changes Set Point changes

  21. 4 FUTURE DEVELOPMENTS 2 .- Accredited Grid Integration field test report • Field tests to demonstrate grid code compliance. • Certified Laboratory testing and accredited procedure • (international acceptability). • Turbine level: • LVRT and HVRT according to most exigent grid codes. • Active power management: Primary, inertial response, power reserve. • Protections. Harmonics. Flicker. Islanding. Etc. • Substation level: • Voltage control. • Global active power controls: Frequency, others. • Protections. Harmonics. Flicker. Islanding. Etc.

  22. CONCLUSSIONS • AWP Grid Voltage support : • AW1500 and AW3000 Turbines: • Improved LVRT / HVRT behavior. • Extended Reactive Power range. • Substation: Accurate and reliable hardware and controls (improved close future solutions, R&D benefits). • Acciona WindPower commitment to demonstrate Full Grid Code compliance through real and accredited field testing.

  23. THANK YOU SO MUCH FOR YOUR ATTENTION • Contact Email: oalonsosadaba@acciona.es • And visit our stand for personal assistance or guidance.

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