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Small Scale Wind Installations - RETScreen Software


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This presentation introduces the fundamental concepts for a small scale wind installation.

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Small Scale Wind Installations - RETScreen Software

  1. 1. Small scale wind energy W. Hulshorst Jan. 2009
  2. 2. Agenda <ul><li>Types of small scale wind energy systems </li></ul><ul><li>2) How to estimate the energy output </li></ul><ul><li>3) Aspects on the location </li></ul><ul><li>4) Case study with RETscreen </li></ul>
  3. 3. What is Small Scale WE? <ul><li>Exact definition is not always clear: </li></ul><ul><li>According IEC 61400:2007: turbines with swept rotor area </li></ul><ul><li>< 200 m2 are classified as </li></ul><ul><li>small scale turbines </li></ul><ul><li>Non universal definitation is </li></ul><ul><li>often based on the kW: </li></ul><ul><li>system that is self yawing (tail vain) </li></ul><ul><li>and < 100 kW. </li></ul>
  4. 4. Wind energy for remote area’s <ul><li>Off grid systems </li></ul><ul><li>Weather stations </li></ul><ul><li>Wind – PV </li></ul><ul><li>Wind – Diesel </li></ul>
  5. 5. Wind energy on buildings Horizontal Vertical In between?
  6. 6. But also integrated
  7. 7. Power curves
  8. 8. Wind distribution <ul><li>To estimate the annual energy: </li></ul><ul><li>Power Curve </li></ul><ul><li>Wind distribution </li></ul><ul><li>At most locations the wind- </li></ul><ul><li>distribution can be described as </li></ul><ul><li>a weibull distribution </li></ul>At higher heigts the wind speed is often higher. That’s the reason why we build wind turbines on a tower Restrication could be the weight of the generator/alternator
  9. 9. Urban wind characteristics <ul><li>small wind turbines require less wind & land resources </li></ul><ul><li>than large turbines, so their installation is feasible in a </li></ul><ul><li>wider variety of locations. </li></ul><ul><li>However small scale wind projects in urban area’s do </li></ul><ul><li>face some constrains: </li></ul><ul><ul><li>Lower annual mean wind speed </li></ul></ul><ul><ul><li>Turbulance </li></ul></ul><ul><ul><li>Potential difficulties in obtaining planning permission </li></ul></ul>
  10. 10. Site conditions effects output
  11. 11. Location <ul><li>Output of energy depends on the windspeed </li></ul><ul><li>The windspeed increases significantly near the top of a </li></ul><ul><li>hill and the air flow should be free of obstacles. </li></ul><ul><li>Existing obstacles, such as buildings, trees can </li></ul><ul><li>significantly affect wind speed. </li></ul><ul><li>Locate as far as possible from obstacles </li></ul><ul><li>Alternatively, the turbine height can be increased to </li></ul><ul><li>compensate the lack of distance </li></ul>
  12. 12. Locations
  13. 13. Other issue’s <ul><li>It is recommended that the wind turbine is located </li></ul><ul><li>reasonably close to the point of energy use or to the </li></ul><ul><li>grid connection. </li></ul><ul><li>Noise and visual impact are particularly sensitive </li></ul><ul><li>issues in a residential area. Both can be subjective and </li></ul><ul><li>hard to judge. </li></ul>
  14. 14. Some interesting websites General information about renewables: Information about wind manufacturers in Europe: Windspeed in different countries:
  15. 15. Thanks for your attention Walter Hulshorst Econ International B.V. PO box 5035 6802 EA Arnhem The Netherlands T: + 31 (0)61 047 45 77 F: + 31 (0)26 381 64 82 E: walter @ W: