Assessment of Research Needs for Wind Turbine Rotor Materials Technology (1991) / Chapter Skim
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6 ACTIVE CONTROL IN WIND TURBINES
6 ACTIVE CONTROL IN WIND TURBINES
Pages 91-100
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From page 91... ...
Discussed here are the control requirement" for wind turbines, together with the control means and sensors typically employed in modern wind turbines. This will provide background and serve as a focal point for subsequent discussion of the applicability of modern control theory to wind turbines.
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From page 92... ...
IYaw Drive Utility } - T/D System (Load for PE)
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From page 93... ...
This sensor may be shared by a number of wind turbines or may be absent altogether. If absent, wind speed may be derived from knowledge of the blade airfoil characteristics, the power level, and the drive train rotational speed.
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From page 94... ...
A systematic study of the fo....er has resulted in algorithms that identify the processes with guaranteed frequency domain error bounds but at the expense of excessive -- but not prohibitive, nowadayn-computational burden that requires real-t~me spectral monitoring of pertinent signals in the feedback loop (LaMaire et al., 19917. The combination of robust identification with a robust controller structure am discussed above, with only infrequent compensator parameter update, as indicated by the quality of the identification process information, hen resulted in the study of performance/"tability robustness of time-varying systems, in particular a" they arise in this context.
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From page 95... ...
This i" no because the system is set to respond to averaged tome information of wind speed profile", in which high-frequency information is suppressed; certainly thin is true for the fast wind gust characteristic times. Thus, although statistical predictive capability exists, application of a modern control design can further help anticipate or, at a minimum, initiate a fact system response on an individual system basis no a" to alleviate a severe wind profile that may be building up.
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From page 96... ...
Thus, fast response can be achieved locally, with very limited control actions, which will be effective in modifying the boundary layer of the unsteady fluid process, thus alleviating excessive loading on the blade. On a more global actuation scale, control of variable-speed machines through their power electronics effected via the rotor does appear to have the potential of tailoring the blade structure to operating in clone to optimal configuration in adverse wind profile-.
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From page 97... ...
However, the wind turbine environment is considerably more severe. In conclusion, a systematic application of readily available control technology can offer substantial advantage" in enabling the wind power industry to realize it" long-term objectives and become a competitive energy alternative.
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From page 98... ...
1991. Robust Time and Frequency Domain Estimation Methods in Adaptive Control.
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From page 99... ...
1987. The Effects of Control Algorithms on Fatigue Life and Energy Production of Vertical Axis Wind Turbines.
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