Abstract
The main problems of Floating Offshore Wind Turbines (FOWT) are the slow dynamic response of Maximum Power Point Tracking (MPPT) control and the low wind energy conversion efficiency. This paper proposes an Improved Torque Compensation (ITC) control strategy, which includes three parts. Firstly, the Torque Compensation (TC) strategy is optimized to mitigate the large fluctuation in output power caused by the increased response speed. Secondly, the control gain for ITC is reasonably adjusted by the Fuzzy Inference System (FIS) based on the rotor speed acceleration and the platform pitch motion acceleration. Thirdly, the power coefficient curve of the Wind Turbine (WT) is optimized, so that the WT performs blade pitch operation below the rated wind speed. Not only further improve the wind energy conversion efficiency of the WT, but also solve the problem of increasing the platform pitch angle caused by ITC. The above three parts of the ITC strategy finally are applied to the MPPT control for the FOWT under the action of wind and waves. The effectiveness of the ITC control strategy is verified by comparing with the three existing MPPT control strategies.
Published Version
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