風力発電システムの独立翼ピッチ操作による翼荷重ゲインスケジューリング制御

抄録

A gain-scheduled control approach of blade loads using individual blade pitch manipulation is developed to reduce variations in aerodynamic loads of wind turbines during rotation. The motivation of the study is that the dynamic characteristics of the blade loads depend on the wind speed and blade pitch. The developed approach consists of the gain-scheduled feedback control (PI action) of the rotor speed using collective blade pitch and generator torque manipulations and the gain-scheduled feedback control (P action) of the d- and q-axis blade loads using individual blade pitch manipulation. The gain-scheduling strategy for the blade load control is developed through a numerical analysis of the NREL 5MW-onshore wind turbine-generator system using the aeroelastic simulation model (FAST) and the observed high wind speed data. The sensitive analysis of the proportional gain for the blade load control reveals that the stability limit gain decreases with the increase in the wind speed. The gain-scheduling strategy based on the stability limit gain reduces the variation in the blade loads during rotation as compared with the individual blade pitch manipulation using the fixed gain as well as the collective blade pitch manipulation without the blade load control.