Pitch Control of Offshore Floating Wind Turbine Based on Fast Integral-Type Terminal Sliding Mode Control Method

Abstract

China has a vast territory and abundant offshore wind resources, which provides an environmental basis for the development of offshore floating wind turbine. The typical characteristics of the development of floating wind turbine are far-reaching sea and large-scale structure. The traditional controller can not deal with the complex marine working conditions and the complexity of the wind turbine structure. For the floating wind turbine, the main control objectives are to stabilize the power output, reduce the load and stabilize the movement of the platform in six degrees of freedom.Therefore, this paper proposes a pitch controller based on the fast integral-type terminal sliding mode (FITS) method, and selects the 5 MW barge floating wind turbine of National Renewable Energy Laboratory (NREL) as the research object. Combined with OpenFAST /Matlab software, the simulation experiments are compared with the traditional baseline gain scheduling PI controller(GSPI) from three aspects: power stability, load shedding and platform motion performance. The simulation results show the effectiveness of the proposed scheme.