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ECN publication
Feed Forward Control of Estimated Wind Speed
Published by: Publication date:
ECN Wind Energy 1-12-2003
ECN report number: Document type:
ECN-C--03-137 ECN publication
Number of pages: Full text:
41 Download PDF  

A control structure ?feed forward of estimated wind speed? is described,as it were: ?the wind turbine rotor will be used as a wind meter?.

The control structure is based on ?estimation? of wind speed as well as a non-linear compensation of a wind speed dependent pitch speed setpoint, which is optimised to maintain (stationary) rated electric power. It is required to know the rotor properties with moderate accuracy.

In time domain simulations, inclusion of a feed forward of estimated wind speed control action has shown to be a powerful extension to current ECN wind turbine control structures:

  • reduction of rotor speed variations:  0.2 rpm decreased standard deviation;
  • improved turbine behaviour to large wind gusts;
  • increase of energy yield of  0.9%;

For reasons of simplicity and robustness, a tabular implementation approach is preferred above polynomial implementation. The resulting brief algorithm uses small sized tables, requires low hardware requirements and needs a minimum of easy interpretable parameters for design and tuning.

Both stability, robustness and parametric uncertainties were observed. The addition control loop has a slightly positive effect on overall stability and robustness. Appeared offsets in the estimated wind speed value due to parameter uncertainties do not have impact on the effectuation of the wind speed feed forward loop.

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