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Wind and wave dynamic loads might cause undesirable vibrations that affect the structure integrity and system performance of floating offshore wind turbines. This paper addresses the problem of dynamic load mitigation 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 H 2 /H ∞ methods for ensuring the system stability and reliability. Furthermore, the proposed controller only uses outputdoi:10.24084/repqj09.449 fatcat:o3logq6qonffbbzwylaxz4hbfa