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Maximizing Wind Farm Output

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Maximizing Wind Farm Output

Maximizing Wind Farm Output


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  • 1. MAXIMIZING WIND FARM PERFORMANCE GREENPOWER CONFERENCE September 2/3, 2009 – Houston, Texas
  • 2. ORTECH Power
    • Wind Power Consulting Firm
      • Wind resource assessments in complex terrain
      • Turbine inspections / End of Warranty tests
      • Performance optimization
      • Preventative maintenance planning
      • Asset management advice
  • 3. Is Underperformance a Problem?
    • At AWEA 2008, 3 prominent wind consulting firms stated the following:
      • “ Underperformance of 10% is typical across the industry”
      • “ Based on 59 facilities and 243 facility years, average output is about 11% below P50”
      • “ Out of 41 wind farms and 113 wind farm years, average production was 90% of predicted production.”
  • 4. Underperformance is a huge problem! Can wipe out ownership value.
  • 5. Potential Causes
    • Over prediction of:
      • Wind Resource
      • Power Curve Efficiency *
      • Availability *
    • Under prediction of:
      • Losses (grid and environmental) *
      • Uncertainty
    • * = manageable by operator
  • 6. Maximizing Performance
    • Existing Operation
      • Develop an asset management strategy that leads to least long term cost of ownership.
      • But how?
  • 7. Normalize for Wind Effects
  • 8. Manage Outage Frequency & Duration
  • 9. Increase parts inventory  Most wind farms have an inadequate parts inventory and supply chain.
  • 10. Reduce Inspection & Repair Costs
  • 11. Understand Parts Life Cycles
    • While unscheduled minor maintenance is expected to remain fairly constant, major repair will occur in intervals and increase in cost with age.
    • Outages will generally increase along with major repairs.
  • 12. Track Rotor Efficiency Wind Speed, m/s Power Output, kW 10-min averages Yaw misalignment correct rotor plane positive negative wind speed vector g F top view +
  • 13. Use Condition Monitoring   
  • 14. Utilize Inspection Tools
  • 15. Manage Life Cycle Cost
    • 20-year life cycle costs for repair and outages can vary from under $0.4 mill/WTG (pro-active mtc.) to over $1 mill/WTG (reactive mtc.). High mechanical loads (turbulence, ice, defects) can further increase cost (up to $2 mill/WTG in extreme cases).
  • 16. Maximizing Performance
    • Develop an asset management strategy that leads to least long term cost of ownership and maximum revenue performance in the long term!