Active Structural Control of Offshore Wind Turbines

The application of control techniques to ofishore wind turbines has the potential to signiflcantly improve the structural response of these systems. Active control is investigated, and compared to a previous investigation into passive control by the authors. A limited degree of freedom model is identifled with synthetic data and used to design a family of controllers using H1 multivariable loop shaping. The controllers in this family are then implemented in full degree of freedom time domain simulations. The performance of the controllers is quantifled using the reduction in fatigue loads of the tower base bending moment. The performance is calculated as a function of active power consumption and the stroke of the active mass damper. The results are compared to the optimal passive system, and the additional achievable load reduction using active control is quantifled.

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