Maximizing Wind Farm Output

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Maximizing Wind Farm Output

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Maximizing Wind Farm Output

  1. 1. MAXIMIZING WIND FARM PERFORMANCE GREENPOWER CONFERENCE September 2/3, 2009 – Houston, Texas
  2. 2. ORTECH Power <ul><li>Wind Power Consulting Firm </li></ul><ul><ul><li>Wind resource assessments in complex terrain </li></ul></ul><ul><ul><li>Turbine inspections / End of Warranty tests </li></ul></ul><ul><ul><li>Performance optimization </li></ul></ul><ul><ul><li>Preventative maintenance planning </li></ul></ul><ul><ul><li>Asset management advice </li></ul></ul>
  3. 3. Is Underperformance a Problem? <ul><li>At AWEA 2008, 3 prominent wind consulting firms stated the following: </li></ul><ul><ul><li>“ Underperformance of 10% is typical across the industry” </li></ul></ul><ul><ul><li>“ Based on 59 facilities and 243 facility years, average output is about 11% below P50” </li></ul></ul><ul><ul><li>“ Out of 41 wind farms and 113 wind farm years, average production was 90% of predicted production.” </li></ul></ul>
  4. 4. Underperformance is a huge problem! Can wipe out ownership value.
  5. 5. Potential Causes <ul><li>Over prediction of: </li></ul><ul><ul><li>Wind Resource </li></ul></ul><ul><ul><li>Power Curve Efficiency * </li></ul></ul><ul><ul><li>Availability * </li></ul></ul><ul><li>Under prediction of: </li></ul><ul><ul><li>Losses (grid and environmental) * </li></ul></ul><ul><ul><li>Uncertainty </li></ul></ul><ul><li>* = manageable by operator </li></ul>
  6. 6. Maximizing Performance <ul><li>Existing Operation </li></ul><ul><ul><li>Develop an asset management strategy that leads to least long term cost of ownership. </li></ul></ul><ul><ul><li>But how? </li></ul></ul>
  7. 7. Normalize for Wind Effects
  8. 8. Manage Outage Frequency & Duration
  9. 9. Increase parts inventory  Most wind farms have an inadequate parts inventory and supply chain.
  10. 10. Reduce Inspection & Repair Costs
  11. 11. Understand Parts Life Cycles <ul><li>While unscheduled minor maintenance is expected to remain fairly constant, major repair will occur in intervals and increase in cost with age. </li></ul><ul><li>Outages will generally increase along with major repairs. </li></ul>
  12. 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. 13. Use Condition Monitoring   
  14. 14. Utilize Inspection Tools
  15. 15. Manage Life Cycle Cost <ul><li>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). </li></ul>
  16. 16. Maximizing Performance <ul><li>Develop an asset management strategy that leads to least long term cost of ownership and maximum revenue performance in the long term! </li></ul>

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