Semiactive Control for Floating Offshore Wind Turbines Subject to Aero-hydro Dynamic Loads

Wind and wave dynamic loads might cause undesirable vibrations that affect the structure in tegrity and system performance of floating offshore wind turbin es. This paper addresses the problem of dynamic load mitigat ion by using semiactive control techniques with the tuned liquid column dampers placed on the turbine's tower. The control law is formulated based on the mixed H2/H ∞ methods for ensuring the system stability and reliability. Furthermore, the proposed controller only uses output feedback so as to avoid the dependence on the knowledge of the states of the sy stem.

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